[gtk/wip/baedert/gtkimageview: 536/536] WIP: Add GtkImageView
- From: Timm Bäder <baedert src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gtk/wip/baedert/gtkimageview: 536/536] WIP: Add GtkImageView
- Date: Sat, 27 Oct 2018 05:46:21 +0000 (UTC)
commit 8e7c4ad1874ecab12fb94b40050cb99288883a02
Author: Timm Bäder <mail baedert org>
Date: Sat Mar 24 20:54:27 2018 +0100
WIP: Add GtkImageView
demos/gtk-demo/demo.gresource.xml | 4 +
demos/gtk-demo/image_view.c | 257 ++++
demos/gtk-demo/image_view.ui | 404 ++++++
demos/gtk-demo/meson.build | 1 +
docs/reference/gtk/gtk4-docs.xml | 1 +
docs/reference/gtk/gtk4-sections.txt | 39 +
docs/reference/gtk/gtk4.types.in | 1 +
docs/reference/gtk/visual_index.xml | 3 +
gdk/gdkpaintable.h | 2 +-
gtk/gtk.h | 1 +
gtk/gtkimageview.c | 2275 ++++++++++++++++++++++++++++++++++
gtk/gtkimageview.h | 116 ++
gtk/gtkwidgetprivate.h | 1 +
gtk/meson.build | 2 +
testsuite/gtk/imageview-size.c | 178 +++
testsuite/gtk/meson.build | 1 +
16 files changed, 3285 insertions(+), 1 deletion(-)
---
diff --git a/demos/gtk-demo/demo.gresource.xml b/demos/gtk-demo/demo.gresource.xml
index bbf603e1ad..23c2243346 100644
--- a/demos/gtk-demo/demo.gresource.xml
+++ b/demos/gtk-demo/demo.gresource.xml
@@ -175,6 +175,7 @@
<file>iconview.c</file>
<file>iconview_edit.c</file>
<file>images.c</file>
+ <file>image_view.c</file>
<file>infobar.c</file>
<file>links.c</file>
<file>listbox.c</file>
@@ -215,6 +216,9 @@
<file>textmask.c</file>
<file>video_player.c</file>
</gresource>
+ <gresource prefix="/imageview">
+ <file>image_view.ui</file>
+ </gresource>
<gresource prefix="/textview">
<file>floppybuddy.gif</file>
</gresource>
diff --git a/demos/gtk-demo/image_view.c b/demos/gtk-demo/image_view.c
new file mode 100644
index 0000000000..47d522dfaa
--- /dev/null
+++ b/demos/gtk-demo/image_view.c
@@ -0,0 +1,257 @@
+/* Image View
+ */
+#include <gtk/gtk.h>
+#include "paintable.h"
+
+GtkWidget *image_view;
+GtkWidget *uri_entry;
+
+
+void
+reset_view_button_clicked_cb ()
+{
+ gtk_image_view_set_scale (GTK_IMAGE_VIEW (image_view), 1.0);
+ gtk_image_view_set_angle (GTK_IMAGE_VIEW (image_view), 0.0);
+}
+
+void
+load_from_file_cb (GObject *source_object,
+ GAsyncResult *result,
+ gpointer user_data)
+{
+ GError *error = NULL;
+
+ gtk_image_view_load_from_file_finish (GTK_IMAGE_VIEW (image_view),
+ result,
+ &error);
+
+ if (error != NULL)
+ {
+ g_warning ("load_from_file_async error: %s", error->message);
+ }
+}
+
+void
+file_set_cb (GtkFileChooserButton *widget,
+ gpointer user_data)
+{
+ char *filename = gtk_file_chooser_get_filename (GTK_FILE_CHOOSER (widget));
+ GFile *file = g_file_new_for_path (filename);
+
+ gtk_image_view_load_from_file_async (GTK_IMAGE_VIEW (image_view),
+ file,
+ NULL,
+ load_from_file_cb,
+ NULL);
+
+ g_free (filename);
+ g_object_unref (file);
+}
+
+static void
+image_loaded_cb (GObject *source_object,
+ GAsyncResult *result,
+ gpointer user_data)
+{
+ GtkImageView *image_view = GTK_IMAGE_VIEW (source_object);
+ GError *error = NULL;
+
+ gtk_image_view_load_from_file_finish (image_view,
+ result,
+ &error);
+
+ if (error)
+ {
+ g_message ("Error: %s", error->message);
+ return;
+ }
+}
+
+void
+load_button_cb ()
+{
+ const char *uri = gtk_entry_get_text (GTK_ENTRY (uri_entry));
+ GFile *file = g_file_new_for_uri (uri);
+
+ g_message (__FUNCTION__);
+ gtk_image_view_load_from_file_async (GTK_IMAGE_VIEW (image_view),
+ file,
+ NULL,
+ image_loaded_cb,
+ NULL);
+ g_object_unref (file);
+}
+
+void
+angle_changed_cb (GtkRange *range,
+ gpointer user_data)
+{
+ double value = gtk_range_get_value (range);
+
+ gtk_image_view_set_angle (GTK_IMAGE_VIEW (image_view), value);
+}
+
+void
+scale_changed_cb (GtkRange *range,
+ gpointer user_data)
+{
+ double value = gtk_range_get_value (range);
+
+ gtk_image_view_set_scale (GTK_IMAGE_VIEW (image_view), value);
+}
+
+void
+rotate_left_clicked_cb ()
+{
+ double current_angle = gtk_image_view_get_angle (GTK_IMAGE_VIEW (image_view));
+
+ gtk_image_view_set_angle (GTK_IMAGE_VIEW (image_view), current_angle - 90);
+}
+
+
+void
+rotate_right_clicked_cb ()
+{
+ double current_angle = gtk_image_view_get_angle (GTK_IMAGE_VIEW (image_view));
+
+ gtk_image_view_set_angle (GTK_IMAGE_VIEW (image_view), current_angle + 90);
+}
+
+void
+scrolled_switch_active_cb (GObject *source)
+{
+ GtkWidget *parent = gtk_widget_get_parent (image_view);
+
+ if (GTK_IS_SCROLLED_WINDOW (parent))
+ {
+ GtkWidget *grandparent = gtk_widget_get_parent (parent);
+ g_assert (grandparent != NULL);
+ g_object_ref (G_OBJECT (image_view));
+ gtk_container_remove (GTK_CONTAINER (parent), image_view);
+ gtk_container_remove (GTK_CONTAINER (grandparent), parent);
+ gtk_container_add (GTK_CONTAINER (grandparent), image_view);
+ gtk_widget_show (image_view);
+ g_object_unref (G_OBJECT (image_view));
+ }
+ else
+ {
+ GtkWidget *scroller = gtk_scrolled_window_new (NULL, NULL);
+ gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scroller),
+ GTK_POLICY_ALWAYS,
+ GTK_POLICY_ALWAYS);
+ g_object_ref (image_view);
+ gtk_container_remove (GTK_CONTAINER (parent), image_view);
+ gtk_container_add (GTK_CONTAINER (scroller), image_view);
+ gtk_container_add (GTK_CONTAINER (parent), scroller);
+ gtk_widget_show (scroller);
+ g_object_unref (image_view);
+ }
+}
+
+gchar *
+angle_scale_format_value_cb (GtkScale *scale,
+ double value,
+ gpointer user_data)
+{
+ return g_strdup_printf ("%.2f°", value);
+}
+
+
+gchar *
+scale_scale_format_value_cb (GtkScale *scale,
+ double value,
+ gpointer user_data)
+{
+ return g_strdup_printf ("%.2f", value);
+}
+
+
+void
+load_pixbuf_button_clicked_cb ()
+{
+ GdkPixbuf *pixbuf;
+ GdkTexture *texture;
+
+ pixbuf = gdk_pixbuf_new_from_file ("/usr/share/backgrounds/gnome/Mirror.jpg", NULL);
+ texture = gdk_texture_new_for_pixbuf (pixbuf);
+ g_object_unref (pixbuf);
+
+ gtk_image_view_set_paintable (GTK_IMAGE_VIEW (image_view),
+ GDK_PAINTABLE (texture));
+}
+
+void
+load_hidpi_pixbuf_button_clicked_cb ()
+{
+ GdkPaintable *p;
+
+ p = gtk_nuclear_animation_new ();
+
+ gtk_image_view_set_paintable (GTK_IMAGE_VIEW (image_view), p);
+ g_object_unref (p);
+}
+
+void
+clear_button_clicked_cb ()
+{
+ gtk_image_view_set_paintable (GTK_IMAGE_VIEW (image_view), NULL);
+}
+
+GtkWidget *
+do_image_view (GtkWidget *do_widget)
+{
+ GtkWidget *window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+ GtkBuilder *builder = gtk_builder_new_from_resource ("/imageview/image_view.ui");
+ GtkWidget *box = GTK_WIDGET (gtk_builder_get_object (builder, "box"));
+ GtkWidget *snap_angle_switch = GTK_WIDGET (gtk_builder_get_object (builder, "snap_angle_switch"));
+ GtkWidget *fit_allocation_switch = GTK_WIDGET (gtk_builder_get_object (builder, "fit_allocation_switch"));
+ GtkWidget *rotate_gesture_switch = GTK_WIDGET (gtk_builder_get_object (builder, "rotate_gesture_switch"));
+ GtkWidget *zoom_gesture_switch = GTK_WIDGET (gtk_builder_get_object (builder, "zoom_gesture_switch"));
+ GtkWidget *transitions_switch = GTK_WIDGET (gtk_builder_get_object (builder, "transitions_switch"));
+
+ GtkAdjustment *scale_adjustment = GTK_ADJUSTMENT (gtk_builder_get_object (builder, "scale_adjustment"));
+ GtkAdjustment *angle_adjustment = GTK_ADJUSTMENT (gtk_builder_get_object (builder, "angle_adjustment"));
+ image_view = GTK_WIDGET (gtk_builder_get_object (builder, "image_view"));
+ uri_entry = GTK_WIDGET (gtk_builder_get_object (builder, "uri_entry"));
+
+
+ g_object_bind_property (scale_adjustment, "value", image_view, "scale",
+ G_BINDING_BIDIRECTIONAL);
+
+ g_object_bind_property (angle_adjustment, "value", image_view, "angle",
+ G_BINDING_SYNC_CREATE);
+ g_object_bind_property (image_view, "angle", angle_adjustment, "value",
+ G_BINDING_SYNC_CREATE);
+
+
+
+ g_object_bind_property (image_view, "snap-angle", snap_angle_switch, "active",
+ G_BINDING_BIDIRECTIONAL | G_BINDING_SYNC_CREATE);
+ g_object_bind_property (image_view, "fit-allocation", fit_allocation_switch, "active",
+ G_BINDING_BIDIRECTIONAL | G_BINDING_SYNC_CREATE);
+
+ g_object_bind_property (image_view, "rotatable",
+ rotate_gesture_switch, "active",
+ G_BINDING_BIDIRECTIONAL | G_BINDING_SYNC_CREATE);
+
+ g_object_bind_property (image_view, "zoomable",
+ zoom_gesture_switch, "active",
+ G_BINDING_BIDIRECTIONAL | G_BINDING_SYNC_CREATE);
+
+ g_object_bind_property (image_view, "transitions-enabled",
+ transitions_switch, "active",
+ G_BINDING_BIDIRECTIONAL | G_BINDING_SYNC_CREATE);
+
+
+
+
+ gtk_container_add (GTK_CONTAINER (window), box);
+ gtk_builder_connect_signals (builder, NULL);
+
+ gtk_window_resize (GTK_WINDOW (window), 800, 600);
+ gtk_widget_show (window);
+
+ g_object_unref (builder);
+
+ return window;
+}
diff --git a/demos/gtk-demo/image_view.ui b/demos/gtk-demo/image_view.ui
new file mode 100644
index 0000000000..3935045930
--- /dev/null
+++ b/demos/gtk-demo/image_view.ui
@@ -0,0 +1,404 @@
+<?xml version="1.0"?>
+<interface>
+ <object class="GtkAdjustment" id="scale_adjustment">
+ <property name="upper">5</property>
+ <property name="lower">0.05</property>
+ <property name="value">1.0</property>
+ <property name="step-increment">0.01</property>
+ <property name="page-increment">0.01</property>
+ </object>
+
+ <object class="GtkAdjustment" id="angle_adjustment">
+ <property name="upper">360</property>
+ <property name="value">0</property>
+ <property name="step_increment">0.1</property>
+ <property name="page-increment">1</property>
+ </object>
+
+
+ <object class="GtkBox" id="box">
+ <property name="visible">true</property>
+ <property name="orientation">horizontal</property>
+
+
+ <child>
+ <object class="GtkGrid" id="grid">
+ <property name="visible">true</property>
+ <property name="row_spacing">6</property>
+ <property name="column_spacing">12</property>
+ <property name="margin">6</property>
+
+
+ <child>
+ <object class="GtkEntry" id="uri_entry">
+ <property name="visible">true</property>
+ <property name="placeholder_text">URI</property>
+ </object>
+ <packing>
+ <property name="left_attach">0</property>
+ <property name="top_attach">0</property>
+ </packing>
+ </child>
+
+ <child>
+ <object class="GtkButton" id="load_button">
+ <property name="visible">true</property>
+ <property name="label" translatable="yes">Load</property>
+ <signal name="clicked" handler="load_button_cb" />
+ </object>
+ <packing>
+ <property name="left_attach">1</property>
+ <property name="top_attach">0</property>
+ </packing>
+ </child>
+
+
+ <child>
+ <object class="GtkFileChooserButton">
+ <property name="visible">true</property>
+ <property name="valign">baseline</property>
+ <signal name="file-set" handler="file_set_cb" />
+ </object>
+ <packing>
+ <property name="left_attach">0</property>
+ <property name="top_attach">1</property>
+ <property name="width">2</property>
+ </packing>
+ </child>
+
+
+ <child>
+ <object class="GtkButton">
+ <property name="visible">true</property>
+ <property name="label" translatable="yes">Load Pixbuf</property>
+ <signal name="clicked" handler="load_pixbuf_button_clicked_cb" object="image_view"/>
+ </object>
+ <packing>
+ <property name="left_attach">0</property>
+ <property name="top_attach">2</property>
+ <property name="width">2</property>
+ </packing>
+ </child>
+
+ <child>
+ <object class="GtkButton">
+ <property name="visible">true</property>
+ <property name="label" translatable="yes">Load HiDPI Pixbuf</property>
+ <signal name="clicked" handler="load_hidpi_pixbuf_button_clicked_cb" object="image_view"/>
+ </object>
+ <packing>
+ <property name="left_attach">0</property>
+ <property name="top_attach">3</property>
+ <property name="width">2</property>
+ </packing>
+ </child>
+
+
+ <child>
+ <object class="GtkButton">
+ <property name="visible">true</property>
+ <property name="label" translatable="yes">Clear</property>
+ <signal name="clicked" handler="clear_button_clicked_cb" />
+ </object>
+ <packing>
+ <property name="left_attach">0</property>
+ <property name="top_attach">4</property>
+ <property name="width">2</property>
+ </packing>
+ </child>
+
+ <child>
+ <object class="GtkLabel">
+ <property name="visible">true</property>
+ <property name="label" translatable="yes">Fit Allocation</property>
+ <property name="halign">start</property>
+ </object>
+ <packing>
+ <property name="left_attach">0</property>
+ <property name="top_attach">6</property>
+ </packing>
+ </child>
+
+ <child>
+ <object class="GtkSwitch" id="fit_allocation_switch">
+ <property name="halign">end</property>
+ </object>
+ <packing>
+ <property name="left_attach">1</property>
+ <property name="top_attach">6</property>
+ </packing>
+ </child>
+
+
+
+
+
+ <child>
+ <object class="GtkLabel">
+ <property name="visible">true</property>
+ <property name="label">In ScrolledWindow</property>
+ <property name="halign">start</property>
+ </object>
+ <packing>
+ <property name="left_attach">0</property>
+ <property name="top_attach">7</property>
+ </packing>
+ </child>
+
+ <child>
+ <object class="GtkSwitch" id="scrolled_switch">
+ <property name="halign">end</property>
+ <property name="active">true</property>
+ <signal name="notify::active" handler="scrolled_switch_active_cb" />
+ </object>
+ <packing>
+ <property name="left_attach">1</property>
+ <property name="top_attach">7</property>
+ </packing>
+ </child>
+
+
+ <child>
+ <object class="GtkLabel">
+ <property name="visible">true</property>
+ <property name="label">Zoomable</property>
+ <property name="halign">start</property>
+ </object>
+ <packing>
+ <property name="left_attach">0</property>
+ <property name="top_attach">8</property>
+ </packing>
+ </child>
+
+ <child>
+ <object class="GtkSwitch" id="zoom_gesture_switch">
+ <property name="halign">end</property>
+ <property name="active">true</property>
+ </object>
+ <packing>
+ <property name="left_attach">1</property>
+ <property name="top_attach">8</property>
+ </packing>
+ </child>
+
+
+ <child>
+ <object class="GtkLabel">
+ <property name="visible">true</property>
+ <property name="label">Rotatable</property>
+ <property name="halign">start</property>
+ </object>
+ <packing>
+ <property name="left_attach">0</property>
+ <property name="top_attach">9</property>
+ </packing>
+ </child>
+
+ <child>
+ <object class="GtkSwitch" id="rotate_gesture_switch">
+ <property name="halign">end</property>
+ <property name="active">true</property>
+ </object>
+ <packing>
+ <property name="left_attach">1</property>
+ <property name="top_attach">9</property>
+ </packing>
+ </child>
+
+ <child>
+ <object class="GtkLabel">
+ <property name="visible">true</property>
+ <property name="label" translatable="yes">Snap Angle</property>
+ <property name="halign">start</property>
+ </object>
+ <packing>
+ <property name="left_attach">0</property>
+ <property name="top_attach">10</property>
+ </packing>
+ </child>
+
+ <child>
+ <object class="GtkSwitch" id="snap_angle_switch">
+ <property name="halign">end</property>
+ </object>
+ <packing>
+ <property name="left_attach">1</property>
+ <property name="top_attach">10</property>
+ </packing>
+ </child>
+
+
+ <child>
+ <object class="GtkLabel">
+ <property name="visible">true</property>
+ <property name="label" translatable="yes">Transitions</property>
+ <property name="halign">start</property>
+ </object>
+ <packing>
+ <property name="left_attach">0</property>
+ <property name="top_attach">11</property>
+ </packing>
+ </child>
+
+ <child>
+ <object class="GtkSwitch" id="transitions_switch">
+ <property name="halign">end</property>
+ </object>
+ <packing>
+ <property name="left_attach">1</property>
+ <property name="top_attach">11</property>
+ </packing>
+ </child>
+
+
+
+ <child>
+ <object class="GtkLabel">
+ <property name="visible">true</property>
+ <property name="label" translatable="yes">Angle</property>
+ <property name="margin_top">12</property>
+ <property name="halign">start</property>
+ <attributes>
+ <attribute name="weight" value="bold" />
+ </attributes>
+ </object>
+ <packing>
+ <property name="left_attach">0</property>
+ <property name="top_attach">12</property>
+ <property name="width">2</property>
+ </packing>
+ </child>
+
+
+
+
+ <child>
+ <object class="GtkScale" id="angle_spin_button">
+ <property name="draw-value">0</property>
+ <property name="visible">true</property>
+ <property name="digits">2</property>
+ <property name="draw-value">0</property>
+ <property name="adjustment">angle_adjustment</property>
+ </object>
+ <packing>
+ <property name="left_attach">0</property>
+ <property name="top_attach">13</property>
+ <property name="width">2</property>
+ </packing>
+ </child>
+
+ <child>
+ <object class="GtkLabel">
+ <property name="visible">true</property>
+ <property name="label" translatable="yes">Scale</property>
+ <property name="halign">start</property>
+ <property name="xalign">0.0</property>
+ <attributes>
+ <attribute name="weight" value="bold" />
+ </attributes>
+ </object>
+ <packing>
+ <property name="left_attach">0</property>
+ <property name="top_attach">14</property>
+ <property name="width">2</property>
+ </packing>
+ </child>
+
+ <child>
+ <object class="GtkScale" id="scale_spin_button">
+ <property name="draw-value">0</property>
+ <property name="visible">true</property>
+ <property name="digits">2</property>
+ <property name="adjustment">scale_adjustment</property>
+ </object>
+ <packing>
+ <property name="left_attach">0</property>
+ <property name="top_attach">15</property>
+ <property name="width">2</property>
+ </packing>
+ </child>
+
+
+ <child>
+ <object class="GtkBox">
+ <property name="visible">true</property>
+ <property name="orientation">horizontal</property>
+ <property name="halign">center</property>
+ <style>
+ <class name="linked" />
+ </style>
+
+ <child>
+ <object class="GtkButton">
+ <property name="visible">true</property>
+ <signal name="clicked" handler="rotate_left_clicked_cb" />
+ <child>
+ <object class="GtkImage">
+ <property name="visible">true</property>
+ <property name="icon-name">object-rotate-left-symbolic</property>
+ </object>
+ </child>
+ </object>
+ </child>
+
+ <child>
+ <object class="GtkButton">
+ <property name="visible">true</property>
+ <signal name="clicked" handler="rotate_right_clicked_cb" />
+ <child>
+ <object class="GtkImage">
+ <property name="visible">true</property>
+ <property name="icon-name">object-rotate-right-symbolic</property>
+ </object>
+ </child>
+ </object>
+ </child>
+
+ </object>
+ <packing>
+ <property name="left_attach">0</property>
+ <property name="top_attach">16</property>
+ <property name="width">2</property>
+ </packing>
+ </child>
+
+
+ <child>
+ <object class="GtkButton" id="reset_button">
+ <property name="visible">true</property>
+ <property name="label" translatable="true">Reset View</property>
+ <property name="valign">end</property>
+ <property name="vexpand">true</property>
+ <signal name="clicked" handler="reset_view_button_clicked_cb" />
+ </object>
+ <packing>
+ <property name="left_attach">0</property>
+ <property name="top_attach">17</property>
+ <property name="width">2</property>
+ </packing>
+ </child>
+
+
+ </object>
+
+ </child>
+
+ <child>
+ <object class="GtkScrolledWindow">
+ <property name="visible">true</property>
+ <child>
+ <object class="GtkImageView" id="image_view">
+ <property name="visible">true</property>
+ <property name="hexpand">true</property>
+ <property name="vexpand">true</property>
+ <property name="width_request">400</property>
+ <property name="height_request">400</property>
+ </object>
+ </child>
+ </object>
+ </child>
+ </object>
+
+
+
+</interface>
diff --git a/demos/gtk-demo/meson.build b/demos/gtk-demo/meson.build
index 93c2902575..528e25553e 100644
--- a/demos/gtk-demo/meson.build
+++ b/demos/gtk-demo/meson.build
@@ -33,6 +33,7 @@ demos = files([
'iconview.c',
'iconview_edit.c',
'images.c',
+ 'image_view.c',
'infobar.c',
'links.c',
'listbox.c',
diff --git a/docs/reference/gtk/gtk4-docs.xml b/docs/reference/gtk/gtk4-docs.xml
index 87a6185af2..8998854895 100644
--- a/docs/reference/gtk/gtk4-docs.xml
+++ b/docs/reference/gtk/gtk4-docs.xml
@@ -104,6 +104,7 @@
<xi:include href="xml/gtklabel.xml" />
<xi:include href="xml/gtkimage.xml" />
<xi:include href="xml/gtkpicture.xml" />
+ <xi:include href="xml/gtkimageview.xml" />
<xi:include href="xml/gtkspinner.xml" />
<xi:include href="xml/gtkinfobar.xml" />
<xi:include href="xml/gtkprogressbar.xml" />
diff --git a/docs/reference/gtk/gtk4-sections.txt b/docs/reference/gtk/gtk4-sections.txt
index c45e7564b9..fb5994bfd0 100644
--- a/docs/reference/gtk/gtk4-sections.txt
+++ b/docs/reference/gtk/gtk4-sections.txt
@@ -1552,6 +1552,45 @@ GtkImageIconNameData
GtkImageGIconData
</SECTION>
+<SECTION>
+<FILE>gtkimageview</FILE>
+<TITLE>GtkImageView</TITLE>
+GtkImageView
+gtk_image_view_new
+gtk_image_view_set_pixbuf
+gtk_image_view_set_surface
+gtk_image_view_set_animation
+gtk_image_view_load_from_file_async
+gtk_image_view_load_from_file_finish
+gtk_image_view_load_from_stream_async
+gtk_image_view_load_from_stream_finish
+gtk_image_view_set_scale
+gtk_image_view_get_scale
+gtk_image_view_set_angle
+gtk_image_view_get_angle
+gtk_image_view_set_snap_angle
+gtk_image_view_get_snap_angle
+gtk_image_view_set_fit_allocation
+gtk_image_view_get_fit_allocation
+gtk_image_view_set_rotatable
+gtk_image_view_get_rotatable
+gtk_image_view_set_zoomable
+gtk_image_view_get_zoomable
+gtk_image_view_get_scale_set
+gtk_image_view_set_transitions_enabled
+gtk_image_view_get_transitions_enabled
+<SUBSECTION Standard>
+GTK_IMAGE_VIEW
+GTK_IS_IMAGE_VIEW
+GTK_TYPE_IMAGE_VIEW
+GTK_IMAGE__VIEW_CLASS
+GTK_IS_IMAGE_VIEW_CLASS
+GTK_IMAGE_VIEW_GET_CLASS
+<SUBSECTION Private>
+GtkImageViewPrivate
+gtk_image_view_get_type
+</SECTION>
+
<SECTION>
<FILE>gtkimcontext</FILE>
<TITLE>GtkIMContext</TITLE>
diff --git a/docs/reference/gtk/gtk4.types.in b/docs/reference/gtk/gtk4.types.in
index 5c8f48d67c..ec12b9b196 100644
--- a/docs/reference/gtk/gtk4.types.in
+++ b/docs/reference/gtk/gtk4.types.in
@@ -86,6 +86,7 @@ gtk_header_bar_get_type
gtk_icon_theme_get_type
gtk_icon_view_get_type
gtk_image_get_type
+gtk_image_view_get_type
gtk_im_context_get_type
gtk_im_context_simple_get_type
gtk_im_multicontext_get_type
diff --git a/docs/reference/gtk/visual_index.xml b/docs/reference/gtk/visual_index.xml
index b75e192c54..522c8736c7 100644
--- a/docs/reference/gtk/visual_index.xml
+++ b/docs/reference/gtk/visual_index.xml
@@ -33,6 +33,9 @@
<link linkend="GtkImage">
<inlinegraphic fileref="image.png" format="PNG"></inlinegraphic>
</link>
+ <link linkend="GtkImageView">
+ <inlinegraphic fileref="image.png" format="PNG"></inlinegraphic>
+ </link>
<link linkend="GtkSeparator">
<inlinegraphic fileref="separator.png" format="PNG"></inlinegraphic>
</link>
diff --git a/gdk/gdkpaintable.h b/gdk/gdkpaintable.h
index 7686286c87..3ca99b9f3d 100644
--- a/gdk/gdkpaintable.h
+++ b/gdk/gdkpaintable.h
@@ -93,7 +93,7 @@ struct _GdkPaintableInterface
double height);
/* get the current contents in an immutable form (optional) */
GdkPaintable * (* get_current_image) (GdkPaintable *paintable);
-
+
/* get flags for potential optimizations (optional) */
GdkPaintableFlags (* get_flags) (GdkPaintable *paintable);
/* preferred width of paintable or 0 if it has no width (optional) */
diff --git a/gtk/gtk.h b/gtk/gtk.h
index 823c079e6e..9c76f6ba08 100644
--- a/gtk/gtk.h
+++ b/gtk/gtk.h
@@ -128,6 +128,7 @@
#include <gtk/gtkicontheme.h>
#include <gtk/gtkiconview.h>
#include <gtk/gtkimage.h>
+#include <gtk/gtkimageview.h>
#include <gtk/gtkimcontext.h>
#include <gtk/gtkimcontextsimple.h>
#include <gtk/gtkimmulticontext.h>
diff --git a/gtk/gtkimageview.c b/gtk/gtkimageview.c
new file mode 100644
index 0000000000..9ee7cf22bc
--- /dev/null
+++ b/gtk/gtkimageview.c
@@ -0,0 +1,2275 @@
+/* Copyright 2018 Timm Bäder
+ *
+ * GTK+ is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * GLib is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with GTK+; see the file COPYING. If not,
+ * see <http://www.gnu.org/licenses/>.
+ */
+
+/**
+ * SECTION:gtkimageview
+ * @Short_description: A widget for displaying content images to users
+ * @Title: GtkImageView
+ *
+ * #GtkImageView is a widget intended to be used to display "content images"
+ * to users. What we refer to as "content images" in the documentation could
+ * be characterized as "images the user is deeply interested in". You should
+ * use #GtkImageView whenever you want to actually present an image instead
+ * of just using an icon.
+ *
+ * Since: 4.0
+ */
+
+#include "config.h"
+#include "gtkimageview.h"
+#include "gtkintl.h"
+#include "gtkprivate.h"
+#include "gtkgesturerotate.h"
+#include "gtkgesturezoom.h"
+#include "gtkscrollable.h"
+#include "gtkadjustment.h"
+#include "gtkprogresstrackerprivate.h"
+#include "gtkeventcontrollerscroll.h"
+#include "gtkeventcontrollermotion.h"
+#include "gtksnapshot.h"
+#include "gtkwidgetprivate.h"
+#include <math.h>
+
+#define DEG_TO_RAD(x) (((x) / 360.0) * (2 * M_PI))
+#define RAD_TO_DEG(x) (((x) / (2.0 * M_PI) * 360.0))
+
+#define TRANSITION_DURATION (150.0 * 1000.0)
+#define ANGLE_TRANSITION_MIN_DELTA (1.0)
+#define SCALE_TRANSITION_MIN_DELTA (0.01)
+
+
+typedef struct
+{
+ double hupper;
+ double vupper;
+ double hvalue;
+ double vvalue;
+ double angle;
+ double scale;
+} State;
+
+typedef struct
+{
+ GdkPaintable *paintable;
+
+ double scale;
+ double angle;
+
+ guint fit_allocation : 1;
+ guint scale_set : 1;
+ guint snap_angle : 1;
+ guint rotatable : 1;
+ guint zoomable : 1;
+ guint in_rotate : 1;
+ guint in_zoom : 1;
+ guint transitions_enabled : 1;
+ guint in_angle_transition : 1;
+ guint in_scale_transition : 1;
+
+ GtkProgressTracker scale_tracker;
+ GtkProgressTracker angle_tracker;
+
+ GtkGesture *rotate_gesture;
+ double gesture_start_angle;
+ double visible_angle;
+
+ GtkGesture *zoom_gesture;
+ GtkEventController *zoom_controller;
+ double gesture_start_scale;
+ double visible_scale;
+
+ GtkEventController *motion_controller;
+
+ /* Current anchor point, or -1/-1.
+ * In widget coordinates. */
+ double anchor_x;
+ double anchor_y;
+
+ /* GtkScrollable stuff */
+ GtkAdjustment *hadjustment;
+ GtkAdjustment *vadjustment;
+ GtkScrollablePolicy hscroll_policy : 1;
+ GtkScrollablePolicy vscroll_policy : 1;
+
+ /* Transitions */
+ double transition_start_angle;
+ guint angle_transition_id;
+
+ double transition_start_scale;
+ guint scale_transition_id;
+
+ /* Event state */
+ double mouse_x;
+ double mouse_y;
+
+ /* FIXME: Delete */
+ /*double anchor_x;*/
+ /*double anchor_y;*/
+} GtkImageViewPrivate;
+
+enum
+{
+ PROP_SCALE = 1,
+ PROP_SCALE_SET,
+ PROP_ANGLE,
+ PROP_ROTATABLE,
+ PROP_ZOOMABLE,
+ PROP_SNAP_ANGLE,
+ PROP_FIT_ALLOCATION,
+ PROP_TRANSITIONS_ENABLED,
+
+ LAST_WIDGET_PROPERTY,
+ PROP_HADJUSTMENT,
+ PROP_VADJUSTMENT,
+ PROP_HSCROLL_POLICY,
+ PROP_VSCROLL_POLICY,
+
+ LAST_PROPERTY
+};
+
+static GParamSpec *widget_props[LAST_WIDGET_PROPERTY] = { NULL, };
+
+
+G_DEFINE_TYPE_WITH_CODE (GtkImageView, gtk_image_view, GTK_TYPE_WIDGET,
+ G_ADD_PRIVATE (GtkImageView)
+ G_IMPLEMENT_INTERFACE (GTK_TYPE_SCROLLABLE, NULL))
+
+static void adjustment_value_changed_cb (GtkAdjustment *adjustment,
+ gpointer user_data);
+
+static void gtk_image_view_update_adjustments (GtkImageView *self);
+
+static void gtk_image_view_compute_bounding_box (GtkImageView *self,
+ double *bb_width_out,
+ double *bb_height_out,
+ double *paintable_width_out,
+ double *paintable_height_out);
+static void gtk_image_view_ensure_gestures (GtkImageView *self);
+
+static inline void gtk_image_view_restrict_adjustment (GtkAdjustment *adjustment);
+static void gtk_image_view_fix_anchor2 (GtkImageView *self,
+ double anchor_x,
+ double anchor_y,
+ const State *old_state);
+
+
+static inline void
+gtk_image_view_invalidate (GtkImageView *self)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+
+ if (priv->fit_allocation)
+ gtk_widget_queue_draw (GTK_WIDGET (self));
+ else
+ gtk_widget_queue_resize (GTK_WIDGET (self));
+}
+
+static inline double
+gtk_image_view_get_real_scale (GtkImageView *self)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+
+ if (priv->in_zoom || priv->in_scale_transition)
+ return priv->visible_scale;
+ else
+ return priv->scale;
+}
+
+static inline double
+gtk_image_view_get_real_angle (GtkImageView *self)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+
+ if (priv->in_rotate || priv->in_angle_transition)
+ return priv->visible_angle;
+ else
+ return priv->angle;
+}
+
+static inline double
+gtk_image_view_clamp_angle (double angle)
+{
+ double new_angle = angle;
+
+ if (angle > 360.0)
+ new_angle -= (int)(angle / 360.0) * 360;
+ else if (angle < 0.0)
+ new_angle += 360 - ((int)(angle /360) * 360.0);
+
+ g_assert (new_angle >= 0.0);
+ g_assert (new_angle <= 360.0);
+
+ return new_angle;
+}
+
+static inline int
+gtk_image_view_get_snapped_angle (double angle)
+{
+ return (int) ((angle + 45.0) / 90.0) * 90;
+}
+
+static void
+gtk_image_view_get_current_state (GtkImageView *self,
+ State *state)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+
+ if (priv->hadjustment != NULL && priv->vadjustment != NULL)
+ {
+ state->hvalue = gtk_adjustment_get_value (priv->hadjustment);
+ state->vvalue = gtk_adjustment_get_value (priv->vadjustment);
+ state->hupper = gtk_adjustment_get_upper (priv->hadjustment);
+ state->vupper = gtk_adjustment_get_upper (priv->vadjustment);
+ }
+ state->angle = gtk_image_view_get_real_angle (self);
+ state->scale = gtk_image_view_get_real_scale (self);
+}
+
+static gboolean
+gtk_image_view_transitions_enabled (GtkImageView *self)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+ gboolean animations_enabled;
+
+ g_object_get (gtk_widget_get_settings (GTK_WIDGET (self)),
+ "gtk-enable-animations", &animations_enabled,
+ NULL);
+
+ return priv->transitions_enabled &&
+ animations_enabled &&
+ priv->paintable &&
+ gtk_widget_get_mapped (GTK_WIDGET (self));
+}
+
+static void
+paintable_contents_changed_cb (GdkPaintable *paintable,
+ gpointer user_data)
+{
+ GtkImageView *self = user_data;
+
+ gtk_widget_queue_draw (GTK_WIDGET (self));
+}
+
+static gboolean
+scale_frameclock_cb (GtkWidget *widget,
+ GdkFrameClock *frame_clock,
+ gpointer user_data)
+{
+ GtkImageView *self = GTK_IMAGE_VIEW (widget);
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+ State state;
+ double t;
+ double new_scale;
+
+ gtk_progress_tracker_advance_frame (&priv->scale_tracker, gdk_frame_clock_get_frame_time (frame_clock));
+ t = gtk_progress_tracker_get_ease_out_cubic (&priv->scale_tracker, FALSE);
+
+ new_scale = (priv->scale - priv->transition_start_scale) * t;
+
+ gtk_image_view_get_current_state (self, &state);
+
+ priv->visible_scale = priv->transition_start_scale + new_scale;
+
+ if (t >= 1.0)
+ priv->in_scale_transition = FALSE;
+
+ if (priv->hadjustment && priv->vadjustment)
+ {
+ gtk_image_view_update_adjustments (self);
+
+ gtk_image_view_fix_anchor2 (self,
+ gtk_widget_get_width (widget) / 2,
+ gtk_widget_get_height (widget) / 2,
+ &state);
+ }
+
+ gtk_image_view_invalidate (self);
+
+ if (gtk_progress_tracker_get_state (&priv->scale_tracker) == GTK_PROGRESS_STATE_AFTER)
+ {
+ priv->scale_transition_id = 0;
+ return G_SOURCE_REMOVE;
+ }
+
+ return G_SOURCE_CONTINUE;
+}
+
+static void
+gtk_image_view_animate_to_scale (GtkImageView *self)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+
+ if (priv->scale_transition_id != 0)
+ gtk_widget_remove_tick_callback (GTK_WIDGET (self), priv->scale_transition_id);
+
+ /* Target scale is priv->scale */
+ priv->in_scale_transition = TRUE;
+ priv->visible_scale = priv->scale;
+ priv->transition_start_scale = priv->scale;
+
+ gtk_progress_tracker_start (&priv->scale_tracker, TRANSITION_DURATION, 0, 1.0);
+ priv->scale_transition_id = gtk_widget_add_tick_callback (GTK_WIDGET (self),
+ scale_frameclock_cb,
+ NULL, NULL);
+}
+
+static gboolean
+angle_frameclock_cb (GtkWidget *widget,
+ GdkFrameClock *frame_clock,
+ gpointer user_data)
+{
+ GtkImageView *self = GTK_IMAGE_VIEW (widget);
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+ const int direction = GPOINTER_TO_INT (user_data);
+ double new_angle;
+ double t;
+ State state;
+ double target_angle = priv->angle;
+
+ if (direction == 1 && target_angle < priv->transition_start_angle)
+ target_angle += 360.0;
+ else if (direction == 0 && target_angle > priv->transition_start_angle)
+ target_angle -= 360.0;
+
+ gtk_progress_tracker_advance_frame (&priv->angle_tracker, gdk_frame_clock_get_frame_time (frame_clock));
+ t = gtk_progress_tracker_get_ease_out_cubic (&priv->angle_tracker, FALSE);
+ new_angle = (target_angle - priv->transition_start_angle) * t;
+
+ gtk_image_view_get_current_state (self, &state);
+
+ priv->visible_angle = priv->transition_start_angle + new_angle;
+
+ if (t >= 1.0)
+ priv->in_angle_transition = FALSE;
+
+ if (priv->hadjustment && priv->vadjustment)
+ {
+ gtk_image_view_update_adjustments (self);
+
+ gtk_image_view_fix_anchor2 (self,
+ gtk_widget_get_width (widget) / 2,
+ gtk_widget_get_height (widget) / 2,
+ &state);
+
+ }
+
+ gtk_image_view_invalidate (self);
+
+ if (gtk_progress_tracker_get_state (&priv->angle_tracker) == GTK_PROGRESS_STATE_AFTER)
+ {
+ priv->angle_transition_id = 0;
+ return G_SOURCE_REMOVE;
+ }
+
+ return G_SOURCE_CONTINUE;
+}
+
+static void
+gtk_image_view_animate_to_angle (GtkImageView *self,
+ int direction)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+
+ if (priv->angle_transition_id != 0)
+ {
+ gtk_widget_remove_tick_callback (GTK_WIDGET (self), priv->angle_transition_id);
+ priv->angle_transition_id = 0;
+ }
+
+ /* Target angle is priv->angle */
+ priv->in_angle_transition = TRUE;
+ priv->visible_angle = priv->angle;
+ priv->transition_start_angle = priv->angle;
+
+ gtk_progress_tracker_start (&priv->angle_tracker, TRANSITION_DURATION, 0, 1.0);
+ priv->angle_transition_id = gtk_widget_add_tick_callback (GTK_WIDGET (self),
+ angle_frameclock_cb,
+ GINT_TO_POINTER (direction),
+ NULL);
+}
+
+static void
+gtk_image_view_do_snapping (GtkImageView *self)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+ double new_angle = gtk_image_view_get_snapped_angle (priv->angle);
+
+ g_assert (priv->snap_angle);
+
+ if (gtk_image_view_transitions_enabled (self))
+ gtk_image_view_animate_to_angle (self, new_angle > priv->angle);
+
+ priv->angle = new_angle;
+
+ /* Don't notify! */
+}
+
+static void
+to_rotate_coords (GtkImageView *self,
+ const State *state,
+ double in_x,
+ double in_y,
+ double *out_x,
+ double *out_y)
+{
+ const double cx = state->hupper / 2.0 - state->hvalue;
+ const double cy = state->vupper / 2.0 - state->vvalue;
+
+ *out_x = in_x - cx;
+ *out_y = in_y - cy;
+}
+
+
+/*
+ * The anchor here is given in widget coordinates.
+ *
+ * The task now is to...
+ * 1) Calculate the position of the anchor on the untransformed image.
+ * That means we have to remove both scaling and rotation from the image
+ * and calculate where the anchor point would be now.
+ * angle and scale for this are saved in @old_state.
+ * 2) Now transform the anchor point by the new state, i.e. apply both
+ * scale and angle to it.
+ */
+static void
+gtk_image_view_fix_anchor2 (GtkImageView *self,
+ double anchor_x,
+ double anchor_y,
+ const State *old_state)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+ graphene_matrix_t old_transform;
+ graphene_matrix_t old_transform_inverse;
+ graphene_matrix_t new_transform;
+ graphene_point_t old_anchor_point;
+ graphene_point_t anchor_point;
+
+ g_assert (!priv->fit_allocation);
+ g_assert (old_state->hupper >= 0);
+ g_assert (old_state->vupper >= 0);
+ g_assert (priv->hadjustment);
+ g_assert (priv->vadjustment);
+ g_assert (anchor_x >= 0);
+ g_assert (anchor_y >= 0);
+ g_assert (anchor_x < gtk_widget_get_width (GTK_WIDGET (self)));
+ g_assert (anchor_y < gtk_widget_get_height (GTK_WIDGET (self)));
+
+ priv->anchor_x = anchor_x;
+ priv->anchor_y = anchor_y;
+
+ g_message ("Anchor: %f/%f", anchor_x, anchor_y);
+ g_message ("Scale: %f -> %f", old_state->scale, priv->scale);
+
+ /* 1) Transform the anchor point back into untransformed paintable coordinates */
+ graphene_point_init (&old_anchor_point,
+ anchor_x + old_state->hvalue,
+ anchor_y + old_state->vvalue);
+ graphene_point_init_from_point (&anchor_point, &old_anchor_point);
+
+ graphene_matrix_init_scale (&old_transform, old_state->scale, old_state->scale, 1);
+ graphene_matrix_rotate (&old_transform, old_state->angle, graphene_vec3_z_axis ());
+ g_assert (graphene_matrix_inverse (&old_transform, &old_transform_inverse));
+ graphene_matrix_transform_point (&old_transform_inverse, &anchor_point, &anchor_point);
+
+ g_message ("Transformed anchor: %f/%f", anchor_point.x, anchor_point.y);
+
+
+ graphene_matrix_init_scale (&new_transform, priv->scale, priv->scale, 1);
+ graphene_matrix_rotate (&new_transform, priv->angle, graphene_vec3_z_axis ());
+ graphene_matrix_transform_point (&new_transform, &anchor_point, &anchor_point);
+
+ g_message ("Anchor now: %f×%f", anchor_point.x, anchor_point.y);
+
+ anchor_point.x += old_state->hvalue;
+ anchor_point.y += old_state->vvalue;
+
+ double diff_x = anchor_point.x - old_anchor_point.x;
+ double diff_y = anchor_point.y - old_anchor_point.y;
+
+ g_message ("Diff: %f/%f", diff_x, diff_y);
+
+ gtk_adjustment_set_value (priv->hadjustment,
+ /*gtk_adjustment_get_value (priv->hadjustment) + */
+ diff_x);
+
+ gtk_adjustment_set_value (priv->vadjustment,
+ /*gtk_adjustment_get_value (priv->vadjustment) + */
+ diff_y);
+
+
+ // XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX
+ //
+ // We can probably do this by taking a point and transforming it (scale + rotate),
+ // then taking the difference betwen before and after. Done. */
+ //
+
+
+}
+
+/*
+ * In here, we need to differenciate between the actual bounding box size,
+ * i.e. the box around the scaled, rotated paintable -- and the size
+ * we need to pass to gdk_paintable_snapshot to achieve the correct rendering.
+ *
+ * The size we assign to @paintable_width_out and @paintable_height_out is
+ * the one we really need to pass directly to gdk_paintable_snapshot. No
+ * scaling will have to be applied before.
+ * This especially means that we don't explicitly scale the paintable at all,
+ * we just increase the size we pass to gdk_paintable_snapshot() and let the
+ * paintable handle it. This way, e.g. SVGs will scale.
+ */
+static void
+gtk_image_view_compute_bounding_box (GtkImageView *self,
+ double *bb_width_out,
+ double *bb_height_out,
+ double *paintable_width_out,
+ double *paintable_height_out)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+ int widget_width, widget_height;
+ double image_width;
+ double image_height;
+ double bb_width;
+ double bb_height;
+ double scale;
+ double angle;
+
+ g_assert (bb_width_out != NULL);
+ g_assert (bb_height_out != NULL);
+
+ if (!priv->paintable)
+ {
+ *bb_width_out = 0;
+ *bb_height_out = 0;
+
+ if (paintable_width_out)
+ *paintable_width_out = 0;
+
+ if (paintable_height_out)
+ *paintable_height_out = 0;
+ return;
+ }
+
+ widget_width = gtk_widget_get_width (GTK_WIDGET (self));
+ widget_height = gtk_widget_get_height (GTK_WIDGET (self));
+ angle = gtk_image_view_get_real_angle (self);
+
+ /* XXX Passing the widget size as default size is probably wrong if
+ * priv->fit_allocation is FALSE? */
+ gdk_paintable_compute_concrete_size (priv->paintable,
+ 0, 0,
+ widget_width,
+ widget_height,
+ &image_width,
+ &image_height);
+
+ /* Calculate the bounding box of the rotated image */
+ {
+ graphene_rect_t bounds;
+ graphene_matrix_t transform;
+
+ graphene_rect_init (&bounds, 0, 0, image_width, image_height);
+ graphene_matrix_init_translate (&transform,
+ &(graphene_point3d_t){
+ - image_width / 2.0f,
+ - image_height / 2.0f,
+ 0});
+ graphene_matrix_rotate (&transform, angle, graphene_vec3_z_axis ());
+
+ graphene_matrix_transform_bounds (&transform, &bounds, &bounds);
+
+ bb_width = bounds.size.width;
+ bb_height = bounds.size.height;
+ }
+
+ if (priv->fit_allocation)
+ {
+ const double scale_x = (double)widget_width / (double)bb_width;
+ const double scale_y = (double)widget_height / (double)bb_height;
+
+ scale = MIN (MIN (scale_x, scale_y), 1.0);
+ }
+ else
+ {
+ scale = gtk_image_view_get_real_scale (self);
+ }
+
+ /* TODO: Doing this here seems *very* wrong. */
+ if (priv->fit_allocation)
+ {
+ g_assert (!priv->scale_set);
+ if (priv->scale != scale)
+ {
+ priv->scale = scale;
+ g_object_notify_by_pspec (G_OBJECT (self),
+ widget_props[PROP_SCALE]);
+ }
+ }
+
+ *bb_width_out = bb_width * scale;
+ *bb_height_out = bb_height * scale;
+
+ if (paintable_width_out)
+ *paintable_width_out = image_width * scale;
+
+ if (paintable_height_out)
+ *paintable_height_out = image_height * scale;
+}
+
+static inline void
+gtk_image_view_restrict_adjustment (GtkAdjustment *adjustment)
+{
+ const double value = gtk_adjustment_get_value (adjustment);
+ const double upper = gtk_adjustment_get_upper (adjustment);
+ const double page_size = gtk_adjustment_get_page_size (adjustment);
+
+ if (value > upper - page_size)
+ gtk_adjustment_set_value (adjustment, upper - page_size);
+ else if (value < 0)
+ gtk_adjustment_set_value (adjustment, 0);
+}
+
+static void
+gtk_image_view_update_adjustments (GtkImageView *self)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+ const int widget_width = gtk_widget_get_width (GTK_WIDGET (self));
+ const int widget_height = gtk_widget_get_height (GTK_WIDGET (self));
+ double bb_width, bb_height;
+
+ if (!priv->hadjustment && !priv->vadjustment)
+ return;
+
+ if (!priv->paintable)
+ {
+ if (priv->hadjustment)
+ gtk_adjustment_configure (priv->hadjustment, 0, 0, 1, 0, 0, 1);
+
+ if (priv->vadjustment)
+ gtk_adjustment_configure (priv->vadjustment, 0, 0, 1, 0, 0, 1);
+
+ return;
+ }
+
+ gtk_image_view_compute_bounding_box (self,
+ &bb_width,
+ &bb_height,
+ NULL,
+ NULL);
+
+ /* compute_bounding_box makes sure that the bounding box is never bigger than
+ * the widget allocation if fit-allocation is set.
+ * We cast width/height to int anyway to avoid tiny differences in size */
+ if (priv->hadjustment)
+ {
+ gtk_adjustment_set_upper (priv->hadjustment, MAX ((int)bb_width, widget_width));
+ gtk_adjustment_set_page_size (priv->hadjustment, widget_width);
+ gtk_image_view_restrict_adjustment (priv->hadjustment);
+ }
+
+ if (priv->vadjustment)
+ {
+ gtk_adjustment_set_upper (priv->vadjustment, MAX ((int)bb_height, widget_height));
+ gtk_adjustment_set_page_size (priv->vadjustment, widget_height);
+ gtk_image_view_restrict_adjustment (priv->vadjustment);
+ }
+}
+
+static void
+gtk_image_view_set_scale_internal (GtkImageView *self,
+ double scale)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+ scale = MAX (0, scale);
+
+ priv->scale = scale;
+ g_object_notify_by_pspec (G_OBJECT (self),
+ widget_props[PROP_SCALE]);
+
+ if (priv->scale_set)
+ {
+ priv->scale_set = FALSE;
+ g_object_notify_by_pspec (G_OBJECT (self),
+ widget_props[PROP_SCALE_SET]);
+ }
+
+ if (priv->fit_allocation)
+ {
+ priv->fit_allocation = FALSE;
+ g_object_notify_by_pspec (G_OBJECT (self),
+ widget_props[PROP_FIT_ALLOCATION]);
+ }
+
+ gtk_image_view_update_adjustments (self);
+
+ gtk_image_view_invalidate (self);
+}
+
+static void
+gesture_zoom_begin_cb (GtkGesture *gesture,
+ GdkEventSequence *sequence,
+ gpointer user_data)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (user_data);
+
+ if (!priv->zoomable ||
+ !priv->paintable)
+ {
+ gtk_gesture_set_state (gesture, GTK_EVENT_SEQUENCE_DENIED);
+ return;
+ }
+
+ if (priv->anchor_x == -1 && priv->anchor_y == -1)
+ {
+ gtk_gesture_get_bounding_box_center (gesture,
+ &priv->anchor_x,
+ &priv->anchor_y);
+ }
+}
+
+static void
+gesture_zoom_end_cb (GtkGesture *gesture,
+ GdkEventSequence *sequence,
+ gpointer self)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+
+ gtk_image_view_set_scale_internal (self, priv->visible_scale);
+
+ priv->in_zoom = FALSE;
+ priv->anchor_x = -1;
+ priv->anchor_y = -1;
+}
+
+static void
+gesture_zoom_cancel_cb (GtkGesture *gesture,
+ GdkEventSequence *sequence,
+ gpointer user_data)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (user_data);
+
+ if (priv->in_zoom)
+ gtk_image_view_set_scale (user_data, priv->gesture_start_scale);
+
+ priv->in_zoom = FALSE;
+ priv->anchor_x = -1;
+ priv->anchor_y = -1;
+}
+
+static void
+gesture_zoom_changed_cb (GtkGestureZoom *gesture,
+ double delta,
+ GtkWidget *widget)
+{
+ GtkImageView *self = GTK_IMAGE_VIEW (widget);
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+ State state;
+ double new_scale;
+
+ if (!priv->in_zoom)
+ {
+ priv->in_zoom = TRUE;
+ priv->gesture_start_scale = priv->scale;
+ }
+
+ if (priv->fit_allocation)
+ {
+ priv->fit_allocation = FALSE;
+ g_object_notify_by_pspec (G_OBJECT (widget),
+ widget_props[PROP_FIT_ALLOCATION]);
+ }
+
+ new_scale = priv->gesture_start_scale * delta;
+ gtk_image_view_get_current_state (self, &state);
+
+ priv->visible_scale = new_scale;
+
+ gtk_image_view_update_adjustments (self);
+
+ if (priv->hadjustment != NULL && priv->vadjustment != NULL)
+ {
+ gtk_image_view_fix_anchor2 (self,
+ priv->anchor_x,
+ priv->anchor_y,
+ &state);
+ }
+
+ gtk_image_view_invalidate (self);
+}
+
+static void
+gesture_rotate_begin_cb (GtkGesture *gesture,
+ GdkEventSequence *sequence,
+ gpointer user_data)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (user_data);
+
+ if (!priv->rotatable ||
+ !priv->paintable)
+ {
+ gtk_gesture_set_state (gesture, GTK_EVENT_SEQUENCE_DENIED);
+ return;
+ }
+
+ if (priv->anchor_x == -1 && priv->anchor_y == -1)
+ {
+ gtk_gesture_get_bounding_box_center (gesture,
+ &priv->anchor_x,
+ &priv->anchor_y);
+ }
+}
+
+static void
+gesture_rotate_end_cb (GtkGesture *gesture,
+ GdkEventSequence *sequence,
+ gpointer self)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+
+ priv->angle = gtk_image_view_clamp_angle (priv->visible_angle);
+
+ if (priv->snap_angle)
+ {
+ /* Will update priv->angle */
+ gtk_image_view_do_snapping (self);
+ }
+ g_object_notify_by_pspec (self,
+ widget_props[PROP_ANGLE]);
+
+ priv->in_rotate = FALSE;
+ priv->anchor_x = -1;
+ priv->anchor_y = -1;
+}
+
+static void
+gesture_rotate_cancel_cb (GtkGesture *gesture,
+ GdkEventSequence *sequence,
+ gpointer self)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+
+ gtk_image_view_update_adjustments (self);
+
+ priv->in_rotate = FALSE;
+ priv->anchor_x = -1;
+ priv->anchor_y = -1;
+}
+
+static void
+gesture_rotate_changed_cb (GtkGestureRotate *gesture,
+ double angle,
+ double delta,
+ GtkWidget *widget)
+{
+ GtkImageView *self = GTK_IMAGE_VIEW (widget);
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+ State old_state;
+ double new_angle;
+
+ if (!priv->in_rotate)
+ {
+ priv->in_rotate = TRUE;
+ priv->gesture_start_angle = priv->angle;
+ }
+
+ new_angle = priv->gesture_start_angle + RAD_TO_DEG (delta);
+ gtk_image_view_get_current_state (self, &old_state);
+
+ priv->visible_angle = new_angle;
+ gtk_image_view_update_adjustments (self);
+
+ if (priv->hadjustment && priv->vadjustment && !priv->fit_allocation)
+ gtk_image_view_fix_anchor2 (self,
+ priv->anchor_x,
+ priv->anchor_y,
+ &old_state);
+
+ gtk_image_view_invalidate (self);
+}
+
+static void
+scroll_controller_scroll_cb (GtkEventControllerScroll *controller,
+ double dx,
+ double dy,
+ gpointer user_data)
+{
+ GtkImageView *self = user_data;
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+ double new_scale;
+ State state;
+
+ new_scale = MAX (0, priv->scale - (0.02 * dy));
+
+ if (!priv->paintable || !priv->zoomable)
+ return;
+
+ /* TODO: We should probably use the step increment or something from the
+ * adjustment to control the scaling granularity? */
+
+ /* TODO: We might want to only conditionally zoom in here, e.g. when
+ * CTRL or SHIFT are pressed. */
+
+ gtk_image_view_get_current_state (self, &state);
+
+ gtk_image_view_set_scale_internal (self, new_scale);
+
+ if (priv->hadjustment && priv->vadjustment)
+ {
+ /*priv->mouse_x = 100;*/
+ /*priv->mouse_y = 200;*/
+ gtk_image_view_fix_anchor2 (self, priv->mouse_x, priv->mouse_y, &state);
+ }
+}
+
+static void
+motion_controller_motion_cb (GtkEventControllerMotion *controller,
+ double x,
+ double y,
+ gpointer user_data)
+{
+ GtkImageView *self = user_data;
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+
+ priv->mouse_x = x;
+ priv->mouse_y = y;
+}
+
+static void
+gtk_image_view_ensure_gestures (GtkImageView *self)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+
+ if (priv->zoomable && priv->zoom_gesture == NULL)
+ {
+ priv->zoom_gesture = gtk_gesture_zoom_new ();
+ g_signal_connect (priv->zoom_gesture, "scale-changed",
+ (GCallback)gesture_zoom_changed_cb, self);
+ g_signal_connect (priv->zoom_gesture, "begin",
+ (GCallback)gesture_zoom_begin_cb, self);
+ g_signal_connect (priv->zoom_gesture, "end",
+ (GCallback)gesture_zoom_end_cb, self);
+ g_signal_connect (priv->zoom_gesture, "cancel",
+ (GCallback)gesture_zoom_cancel_cb, self);
+ gtk_widget_add_controller (GTK_WIDGET (self),
+ GTK_EVENT_CONTROLLER (priv->zoom_gesture));
+
+ priv->zoom_controller = gtk_event_controller_scroll_new (GTK_EVENT_CONTROLLER_SCROLL_BOTH_AXES);
+ g_signal_connect (priv->zoom_controller, "scroll",
+ (GCallback)scroll_controller_scroll_cb, self);
+ gtk_widget_add_controller (GTK_WIDGET (self),
+ priv->zoom_controller);
+
+
+ /* We only need this one for scrolling, to know the mouse position at the time of
+ * a ::scroll emission */
+ priv->motion_controller = gtk_event_controller_motion_new ();
+ g_signal_connect (priv->motion_controller, "motion", (GCallback)motion_controller_motion_cb, self);
+ gtk_widget_add_controller (GTK_WIDGET (self), priv->motion_controller);
+ }
+ else if (!priv->zoomable && priv->zoom_gesture != NULL)
+ {
+ gtk_widget_remove_controller (GTK_WIDGET (self),
+ GTK_EVENT_CONTROLLER (priv->zoom_gesture));
+ priv->zoom_gesture = NULL;
+ }
+
+ if (priv->rotatable && priv->rotate_gesture == NULL)
+ {
+ priv->rotate_gesture = gtk_gesture_rotate_new ();
+ g_signal_connect (priv->rotate_gesture, "angle-changed", (GCallback)gesture_rotate_changed_cb, self);
+ g_signal_connect (priv->rotate_gesture, "begin", (GCallback)gesture_rotate_begin_cb, self);
+ g_signal_connect (priv->rotate_gesture, "end", (GCallback)gesture_rotate_end_cb, self);
+ g_signal_connect (priv->rotate_gesture, "cancel", (GCallback)gesture_rotate_cancel_cb, self);
+
+ gtk_widget_add_controller (GTK_WIDGET (self),
+ GTK_EVENT_CONTROLLER (priv->rotate_gesture));
+
+ }
+ else if (!priv->rotatable && priv->rotate_gesture != NULL)
+ {
+ gtk_widget_remove_controller (GTK_WIDGET (self),
+ GTK_EVENT_CONTROLLER (priv->rotate_gesture));
+ priv->rotate_gesture = NULL;
+ }
+
+ if (priv->zoom_gesture && priv->rotate_gesture)
+ gtk_gesture_group (priv->zoom_gesture,
+ priv->rotate_gesture);
+}
+
+static void
+gtk_image_view_init (GtkImageView *self)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+ GtkWidget *widget = GTK_WIDGET (self);
+
+ gtk_widget_set_has_surface (widget, FALSE);
+
+ priv->scale = 1.0;
+ priv->angle = 0.0;
+ priv->visible_scale = 1.0;
+ priv->visible_angle = 0.0;
+ priv->snap_angle = FALSE;
+ priv->fit_allocation = FALSE;
+ priv->scale_set = FALSE;
+ priv->anchor_x = -1;
+ priv->anchor_y = -1;
+ priv->rotatable = TRUE;
+ priv->zoomable = TRUE;
+ priv->transitions_enabled = TRUE;
+ priv->angle_transition_id = 0;
+ priv->scale_transition_id = 0;
+
+ gtk_image_view_ensure_gestures (self);
+}
+
+static void
+gtk_image_view_snapshot (GtkWidget *widget,
+ GtkSnapshot *snapshot)
+{
+ GtkImageView *self = GTK_IMAGE_VIEW (widget);
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+ graphene_matrix_t transform;
+ int widget_width;
+ int widget_height;
+ double draw_x = 0;
+ double draw_y = 0;
+ double paintable_width;
+ double paintable_height;
+ double bb_width, bb_height;
+
+ if (!priv->paintable)
+ return;
+
+ gtk_image_view_compute_bounding_box (self,
+ &bb_width,
+ &bb_height,
+ &paintable_width,
+ &paintable_height);
+
+ if (paintable_width <= 0 || paintable_height <= 0)
+ return;
+
+ widget_width = gtk_widget_get_width (widget);
+ widget_height = gtk_widget_get_height (widget);
+
+ if (priv->fit_allocation)
+ {
+ draw_x = (widget_width - paintable_width) / 2;
+ draw_y = (widget_height - paintable_height) / 2;
+ }
+ else
+ {
+ /* If the image we draw is smaller than the widget size, we
+ * center it anyway */
+ if (bb_width <= widget_width)
+ {
+ draw_x = (widget_width - paintable_width) / 2.0;
+ }
+ else if (priv->hadjustment)
+ {
+ draw_x = -gtk_adjustment_get_value (priv->hadjustment);
+ }
+
+ if (bb_height <= widget_height)
+ {
+ draw_y = (widget_height - paintable_height) / 2.0;
+ }
+ else if (priv->vadjustment)
+ {
+ draw_y = -gtk_adjustment_get_value (priv->vadjustment);
+ }
+ }
+
+ /* Rotate around the center */
+ graphene_matrix_init_identity (&transform);
+
+ gtk_snapshot_push_clip (snapshot,
+ &GRAPHENE_RECT_INIT (0, 0, widget_width, widget_height));
+
+ graphene_matrix_translate (&transform,
+ &GRAPHENE_POINT3D_INIT (-(paintable_width / 2.0f),
+ -(paintable_height / 2.0f),
+ 0));
+
+ graphene_matrix_rotate (&transform,
+ gtk_image_view_get_real_angle (self),
+ graphene_vec3_z_axis ());
+
+ graphene_matrix_translate (&transform,
+ &GRAPHENE_POINT3D_INIT((paintable_width / 2.0f) + draw_x,
+ (paintable_height / 2.0f) + draw_y,
+ 0));
+ gtk_snapshot_push_transform (snapshot, &transform);
+
+ gdk_paintable_snapshot (priv->paintable, snapshot, paintable_width, paintable_height);
+
+ gtk_snapshot_pop (snapshot); /* Transform */
+ gtk_snapshot_pop (snapshot); /* Clip */
+
+ gtk_snapshot_append_color (snapshot,
+ &(GdkRGBA){1, 0, 0, 1},
+ &GRAPHENE_RECT_INIT (priv->anchor_x - 2,
+ priv->anchor_y - 2,
+ 4,4));
+}
+
+static void
+gtk_image_view_set_hadjustment (GtkImageView *self,
+ GtkAdjustment *hadjustment)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+
+ if (priv->hadjustment && priv->hadjustment == hadjustment)
+ return;
+
+ if (priv->hadjustment)
+ {
+ g_signal_handlers_disconnect_by_func (priv->hadjustment, adjustment_value_changed_cb, self);
+ g_object_unref (priv->hadjustment);
+ }
+
+ if (hadjustment)
+ {
+ g_signal_connect (G_OBJECT (hadjustment), "value-changed",
+ G_CALLBACK (adjustment_value_changed_cb), self);
+ priv->hadjustment = g_object_ref_sink (hadjustment);
+ }
+ else
+ {
+ priv->hadjustment = hadjustment;
+ }
+
+ g_object_notify (G_OBJECT (self), "hadjustment");
+
+ gtk_image_view_update_adjustments (self);
+
+ gtk_image_view_invalidate (self);
+}
+
+static void
+gtk_image_view_set_vadjustment (GtkImageView *self,
+ GtkAdjustment *vadjustment)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+
+ if (priv->vadjustment == vadjustment)
+ return;
+
+ if (priv->vadjustment)
+ {
+ g_signal_handlers_disconnect_by_func (priv->vadjustment, adjustment_value_changed_cb, self);
+ g_object_unref (priv->vadjustment);
+ }
+
+ if (vadjustment)
+ {
+ g_signal_connect (G_OBJECT (vadjustment), "value-changed",
+ G_CALLBACK (adjustment_value_changed_cb), self);
+ priv->vadjustment = g_object_ref_sink (vadjustment);
+ }
+ else
+ {
+ priv->vadjustment = vadjustment;
+ }
+
+ g_object_notify (G_OBJECT (self), "vadjustment");
+
+ gtk_image_view_update_adjustments (self);
+
+ gtk_image_view_invalidate (self);
+}
+
+static void
+gtk_image_view_set_hscroll_policy (GtkImageView *self,
+ GtkScrollablePolicy hscroll_policy)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+
+ if (priv->hscroll_policy == hscroll_policy)
+ return;
+
+ priv->hscroll_policy = hscroll_policy;
+ g_object_notify (G_OBJECT (self), "hscroll-policy");
+}
+
+static void
+gtk_image_view_set_vscroll_policy (GtkImageView *self,
+ GtkScrollablePolicy vscroll_policy)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+
+ if (priv->vscroll_policy == vscroll_policy)
+ return;
+
+ priv->vscroll_policy = vscroll_policy;
+ g_object_notify (G_OBJECT (self), "vscroll-policy");
+}
+
+/**
+ * gtk_image_view_set_scale:
+ * @self: A #GtkImageView instance
+ * @scale: The new scale value
+ *
+ * Sets the value of the #scale property. This will cause the
+ * #scale-set property to be set to #FALSE as well
+ *
+ * If #GtkImageView:fit-allocation is %TRUE, it will be set to %FALSE, and @self
+ * will be resized to the image's current size, taking the new scale into
+ * account.
+ *
+ * If #GtkImageView:transitions-enabled is set to %TRUE, the internal scale value will be
+ * interpolated between the old and the new scale, gtk_image_view_get_scale()
+ * will report the one passed to gtk_image_view_set_scale() however.
+ *
+ * When calling this function, #GtkImageView will try to keep the currently centered
+ * point of the image where it is, so visually it will "zoom" into the current
+ * center of the widget. Note that #GtkImageView is a #GtkScrollable, so the center
+ * of the image is also the center of the scrolled window in case it is packed into
+ * a #GtkScrolledWindow.
+ *
+ * Since: 4.0
+ */
+void
+gtk_image_view_set_scale (GtkImageView *self,
+ double scale)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+ State state;
+
+ g_return_if_fail (GTK_IS_IMAGE_VIEW (self));
+ g_return_if_fail (scale > 0.0);
+
+ if (scale == priv->scale)
+ return;
+
+ gtk_image_view_get_current_state (self, &state);
+
+ priv->scale = scale;
+ g_object_notify_by_pspec (G_OBJECT (self),
+ widget_props[PROP_SCALE]);
+
+ if (gtk_image_view_transitions_enabled (self))
+ gtk_image_view_animate_to_scale (self);
+
+ if (priv->scale_set)
+ {
+ priv->scale_set = FALSE;
+ g_object_notify_by_pspec (G_OBJECT (self),
+ widget_props[PROP_SCALE_SET]);
+ }
+
+ if (priv->fit_allocation)
+ {
+ priv->fit_allocation = FALSE;
+ g_object_notify_by_pspec (G_OBJECT (self),
+ widget_props[PROP_FIT_ALLOCATION]);
+ }
+
+
+ if (!priv->paintable)
+ return;
+
+ if (priv->hadjustment != NULL && priv->vadjustment != NULL)
+ {
+ gtk_image_view_fix_anchor2 (self,
+ gtk_widget_get_width (GTK_WIDGET (self)) / 2,
+ gtk_widget_get_height (GTK_WIDGET (self)) / 2,
+ &state);
+ }
+
+ gtk_image_view_update_adjustments (self);
+
+ gtk_image_view_invalidate (self);
+}
+
+/**
+ * gtk_image_view_get_scale:
+ * @self: A #GtkImageView instance
+ *
+ * Returns: The current value of the #GtkImageView:scale property.
+ *
+ * Since: 4.0
+ */
+double
+gtk_image_view_get_scale (GtkImageView *self)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+
+ g_return_val_if_fail (GTK_IS_IMAGE_VIEW (self), 0.0);
+
+ return priv->scale;
+}
+
+/**
+ * gtk_image_view_set_angle:
+ * @self: A #GtkImageView instance
+ * @angle: The angle to rotate the image about, in
+ * degrees. If this is < 0 or > 360, the value will
+ * be wrapped. So e.g. setting this to 362 will result in a
+ * angle of 2, setting it to -2 will result in 358.
+ * Both 0 and 360 are possible.
+ *
+ * Sets the value of the #GtkImageView:angle property. When calling this function,
+ * #GtkImageView will try to keep the currently centered point of the image where it is,
+ * so visually the image will not be rotated around its center, but around the current
+ * center of the widget. Note that #GtkImageView is a #GtkScrollable, so the center
+ * of the image is also the center of the scrolled window in case it is packed into
+ * a #GtkScrolledWindow.
+ *
+ * Since: 4.0
+ */
+void
+gtk_image_view_set_angle (GtkImageView *self,
+ double angle)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+ State state;
+
+ g_return_if_fail (GTK_IS_IMAGE_VIEW (self));
+
+ if (angle == priv->angle)
+ return;
+
+ gtk_image_view_get_current_state (self, &state);
+
+ angle = gtk_image_view_clamp_angle (angle);
+
+ if (priv->snap_angle)
+ priv->angle = gtk_image_view_get_snapped_angle (angle);
+ else
+ priv->angle = angle;
+
+ if (gtk_image_view_transitions_enabled (self) &&
+ ABS(gtk_image_view_clamp_angle (angle) - priv->angle) > ANGLE_TRANSITION_MIN_DELTA)
+ {
+ gtk_image_view_animate_to_angle (self, angle > priv->angle);
+ }
+
+ g_object_notify_by_pspec (G_OBJECT (self),
+ widget_props[PROP_ANGLE]);
+
+ if (!priv->paintable)
+ return;
+
+ if (priv->hadjustment && priv->vadjustment && !priv->fit_allocation)
+ {
+ gtk_image_view_fix_anchor2 (self,
+ gtk_widget_get_width (GTK_WIDGET (self)) / 2,
+ gtk_widget_get_height (GTK_WIDGET (self)) / 2,
+ &state);
+ }
+
+ gtk_image_view_invalidate (self);
+
+ gtk_image_view_update_adjustments (self);
+}
+
+/**
+ * gtk_image_view_get_angle:
+ * @self: A #GtkImageView instance
+ *
+ * Returns: The current angle value.
+ *
+ * Since: 4.0
+ */
+double
+gtk_image_view_get_angle (GtkImageView *self)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+
+ g_return_val_if_fail (GTK_IS_IMAGE_VIEW (self), 0.0);
+
+ return priv->angle;
+}
+
+/**
+ * gtk_image_view_set_snap_angle:
+ * @self: A #GtkImageView instance
+ * @snap_angle: The new value of the #GtkImageView:snap-angle property
+ *
+ * Setting #snap-angle to %TRUE will cause @self's angle to
+ * be snapped to 90° steps. Setting the #GtkImageView:angle property will cause it to
+ * be set to the closest 90° step, so e.g. using an angle of 40 will result
+ * in an angle of 0, using 240 will result in 270, etc.
+ *
+ * Since: 4.0
+ */
+void
+gtk_image_view_set_snap_angle (GtkImageView *self,
+ gboolean snap_angle)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+
+ g_return_if_fail (GTK_IS_IMAGE_VIEW (self));
+
+ snap_angle = !!snap_angle;
+
+ if (snap_angle == priv->snap_angle)
+ return;
+
+ priv->snap_angle = snap_angle;
+ g_object_notify_by_pspec (G_OBJECT (self),
+ widget_props[PROP_SNAP_ANGLE]);
+
+ if (priv->snap_angle)
+ {
+ gtk_image_view_do_snapping (self);
+ g_object_notify_by_pspec (G_OBJECT (self),
+ widget_props[PROP_ANGLE]);
+ }
+}
+
+/**
+ * gtk_image_view_get_snap_angle:
+ * @self: A #GtkImageView instance
+ *
+ * Returns: The current value of the #GtkImageView:snap-angle property.
+ *
+ * Since: 4.0
+ */
+gboolean
+gtk_image_view_get_snap_angle (GtkImageView *self)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+
+ g_return_val_if_fail (GTK_IS_IMAGE_VIEW (self), FALSE);
+
+ return priv->snap_angle;
+}
+
+/**
+ * gtk_image_view_set_fit_allocation:
+ * @self: A #GtkImageView instance
+ * @fit_allocation: The new value of the #GtkImageView:fit-allocation property.
+ *
+ * Setting #GtkImageView:fit-allocation to %TRUE will cause the image to be scaled
+ * to the widget's allocation, unless it would cause the image to be
+ * scaled up.
+ *
+ * Setting #GtkImageView:fit-allocation will have the side effect of setting
+ * #scale-set set to %FALSE, thus giving the #GtkImageView the control
+ * over the image's scale. Additionally, if the new #GtkImageView:fit-allocation
+ * value is %FALSE, the scale will be reset to 1.0 and the #GtkImageView
+ * will be resized to take at least the image's real size.
+ *
+ * Since: 4.0
+ */
+void
+gtk_image_view_set_fit_allocation (GtkImageView *self,
+ gboolean fit_allocation)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+
+ g_return_if_fail (GTK_IS_IMAGE_VIEW (self));
+
+ fit_allocation = !!fit_allocation;
+
+ if (fit_allocation == priv->fit_allocation)
+ return;
+
+ priv->fit_allocation = fit_allocation;
+ g_object_notify_by_pspec (G_OBJECT (self),
+ widget_props[PROP_FIT_ALLOCATION]);
+
+ if (priv->scale_set)
+ {
+ priv->scale_set = FALSE;
+ g_object_notify_by_pspec (G_OBJECT (self),
+ widget_props[PROP_SCALE_SET]);
+ }
+
+ if (!priv->fit_allocation)
+ {
+ priv->scale = 1.0;
+ g_object_notify_by_pspec (G_OBJECT (self),
+ widget_props[PROP_SCALE]);
+ }
+
+ gtk_image_view_update_adjustments (self);
+
+ /* We always need to queue a resize here */
+ gtk_widget_queue_resize (GTK_WIDGET (self));
+}
+
+/**
+ * gtk_image_view_get_fit_allocation:
+ * @self: A #GtkImageView instance
+ *
+ * Returns: The current value of the #GtkImageView:fit-allocation property.
+ *
+ * Since: 4.0
+ */
+gboolean
+gtk_image_view_get_fit_allocation (GtkImageView *self)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+
+ g_return_val_if_fail (GTK_IS_IMAGE_VIEW (self), FALSE);
+
+ return priv->fit_allocation;
+}
+
+/**
+ * gtk_image_view_set_rotatable:
+ * @self: A #GtkImageView instance
+ * @rotatable: The new value of the #GtkImageView:rotatable property
+ *
+ * Sets the value of the #GtkImageView:rotatable property to @rotatable. This controls whether
+ * the user can change the angle of the displayed image using a two-finger gesture.
+ *
+ * Since: 4.0
+ */
+void
+gtk_image_view_set_rotatable (GtkImageView *self,
+ gboolean rotatable)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+
+ g_return_if_fail (GTK_IS_IMAGE_VIEW (self));
+
+ rotatable = !!rotatable;
+
+ if (priv->rotatable != rotatable)
+ {
+ priv->rotatable = rotatable;
+ gtk_image_view_ensure_gestures (self);
+ g_object_notify_by_pspec (G_OBJECT (self),
+ widget_props[PROP_ROTATABLE]);
+ }
+}
+
+ double bb_width, bb_height;
+/**
+ * gtk_image_view_get_rotatable:
+ * @self: A #GtkImageView instance
+ *
+ * Returns: The current value of the #GtkImageView:rotatable property
+ *
+ * Since: 4.0
+ */
+gboolean
+gtk_image_view_get_rotatable (GtkImageView *self)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+
+ g_return_val_if_fail (GTK_IS_IMAGE_VIEW (self), FALSE);
+
+ return priv->rotatable;
+}
+
+/**
+ * gtk_image_view_set_zoomable:
+ * @self: A #GtkImageView instance
+ * @zoomable: The new value of the #GtkImageView:zoomable property
+ *
+ * Sets the new value of the #GtkImageView:zoomable property. This controls whether the user can
+ * change the #GtkImageView:scale property using a two-finger gesture.
+ *
+ * Since: 4.0
+ */
+void
+gtk_image_view_set_zoomable (GtkImageView *self,
+ gboolean zoomable)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+
+ g_return_if_fail (GTK_IS_IMAGE_VIEW (self));
+
+ zoomable = !!zoomable;
+
+ if (zoomable != priv->zoomable)
+ {
+ priv->zoomable = zoomable;
+ gtk_image_view_ensure_gestures (self);
+ g_object_notify_by_pspec (G_OBJECT (self),
+ widget_props[PROP_ZOOMABLE]);
+ }
+}
+
+/**
+ * gtk_image_view_get_zoomable:
+ * @self: A #GtkImageView instance
+ *
+ * Returns: The current value of the #GtkImageView:zoomable property.
+ *
+ * Since: 4.0
+ */
+gboolean
+gtk_image_view_get_zoomable (GtkImageView *self)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+
+ g_return_val_if_fail (GTK_IS_IMAGE_VIEW (self), FALSE);
+
+ return priv->zoomable;
+}
+
+/**
+ * gtk_image_view_set_transitions_enabled:
+ * @self: A #GtkImageView instance
+ * @transitions_enabled: The new value of the #GtkImageView:transitions-enabled property
+ *
+ * Sets the new value of the #GtkImageView:transitions-enabled property.
+ * Note that even if #GtkImageView:transitions-enabled is %TRUE, transitions will
+ * not be used if #GtkSettings:gtk-enable-animations is %FALSE.
+ *
+ * Since: 4.0
+ */
+void
+gtk_image_view_set_transitions_enabled (GtkImageView *self,
+ gboolean transitions_enabled)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+
+ g_return_if_fail (GTK_IS_IMAGE_VIEW (self));
+
+ transitions_enabled = !!transitions_enabled;
+
+ if (transitions_enabled != priv->transitions_enabled)
+ {
+ priv->transitions_enabled = transitions_enabled;
+ g_object_notify_by_pspec (G_OBJECT (self),
+ widget_props[PROP_TRANSITIONS_ENABLED]);
+ }
+}
+
+/**
+ * gtk_image_view_get_transitions_enabled:
+ * @self: A #GtkImageView instance
+ *
+ * Returns: the current value of the #GtkImageView:transitions-enabled property.
+ *
+ * Since: 4.0
+ */
+gboolean
+gtk_image_view_get_transitions_enabled (GtkImageView *self)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+
+ g_return_val_if_fail (GTK_IS_IMAGE_VIEW (self), FALSE);
+
+ return priv->transitions_enabled;
+}
+
+/**
+ * gtk_image_view_get_scale_set:
+ * @self: A #GtkImageView instance
+ *
+ * Returns: the current value of the #GtkImageView:scale-set property.
+ *
+ * Since: 4.0
+ */
+gboolean
+gtk_image_view_get_scale_set (GtkImageView *self)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+
+ g_return_val_if_fail (GTK_IS_IMAGE_VIEW (self), FALSE);
+
+ return priv->scale_set;
+}
+
+static void
+gtk_image_view_size_allocate (GtkWidget *widget,
+ const GtkAllocation *allocation,
+ int baseline)
+{
+ GtkImageView *self = GTK_IMAGE_VIEW (widget);
+
+ gtk_image_view_update_adjustments (self);
+}
+
+static void
+adjustment_value_changed_cb (GtkAdjustment *adjustment,
+ gpointer user_data)
+{
+ GtkImageView *self = user_data;
+
+ gtk_widget_queue_draw (GTK_WIDGET (self));
+}
+
+static void
+gtk_image_view_measure (GtkWidget *widget,
+ GtkOrientation orientation,
+ int for_size,
+ int *minimum,
+ int *natural,
+ int *minimum_baseline,
+ int *natural_baselien)
+{
+ GtkImageView *self = GTK_IMAGE_VIEW (widget);
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+
+ if (priv->fit_allocation && priv->paintable)
+ {
+ *minimum = 0;
+ // XXX We should probably also call compute_concrete_size in here?
+
+ if (orientation == GTK_ORIENTATION_HORIZONTAL)
+ {
+ *natural = gdk_paintable_get_intrinsic_width (priv->paintable);
+ }
+ else /* VERTICAL */
+ {
+ *natural = gdk_paintable_get_intrinsic_height (priv->paintable);
+ }
+ }
+ else
+ {
+ double width, height;
+
+ gtk_image_view_compute_bounding_box (self,
+ &width,
+ &height,
+ NULL,
+ NULL);
+
+ if (orientation == GTK_ORIENTATION_HORIZONTAL)
+ {
+ *minimum = (int)ceil (width);
+ *natural = (int)ceil (width);
+ }
+ else /* VERTICAL */
+ {
+ *minimum = (int)ceil (height);
+ *natural = (int)ceil (height);
+ }
+ }
+}
+
+static void
+gtk_image_view_set_property (GObject *object,
+ guint prop_id,
+ const GValue *value,
+ GParamSpec *pspec)
+
+{
+ GtkImageView *self = (GtkImageView *) object;
+
+ switch (prop_id)
+ {
+ case PROP_SCALE:
+ gtk_image_view_set_scale (self, g_value_get_double (value));
+ break;
+ case PROP_ANGLE:
+ gtk_image_view_set_angle (self, g_value_get_double (value));
+ break;
+ case PROP_SNAP_ANGLE:
+ gtk_image_view_set_snap_angle (self, g_value_get_boolean (value));
+ break;
+ case PROP_FIT_ALLOCATION:
+ gtk_image_view_set_fit_allocation (self, g_value_get_boolean (value));
+ break;
+ case PROP_ROTATABLE:
+ gtk_image_view_set_rotatable (self, g_value_get_boolean (value));
+ break;
+ case PROP_ZOOMABLE:
+ gtk_image_view_set_zoomable (self, g_value_get_boolean (value));
+ break;
+ case PROP_TRANSITIONS_ENABLED:
+ gtk_image_view_set_transitions_enabled (self, g_value_get_boolean (value));
+ break;
+ case PROP_HADJUSTMENT:
+ gtk_image_view_set_hadjustment (self, g_value_get_object (value));
+ break;
+ case PROP_VADJUSTMENT:
+ gtk_image_view_set_vadjustment (self, g_value_get_object (value));
+ break;
+ case PROP_HSCROLL_POLICY:
+ gtk_image_view_set_hscroll_policy (self, g_value_get_enum (value));
+ break;
+ case PROP_VSCROLL_POLICY:
+ gtk_image_view_set_vscroll_policy (self, g_value_get_enum (value));
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ }
+}
+
+static void
+gtk_image_view_get_property (GObject *object,
+ guint prop_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ GtkImageView *self = (GtkImageView *)object;
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+
+ switch (prop_id)
+ {
+ case PROP_SCALE:
+ g_value_set_double (value, priv->scale);
+ break;
+ case PROP_SCALE_SET:
+ g_value_set_boolean (value, priv->scale_set);
+ break;
+ case PROP_ANGLE:
+ g_value_set_double (value, priv->angle);
+ break;
+ case PROP_SNAP_ANGLE:
+ g_value_set_boolean (value, priv->snap_angle);
+ break;
+ case PROP_FIT_ALLOCATION:
+ g_value_set_boolean (value, priv->fit_allocation);
+ break;
+ case PROP_ROTATABLE:
+ g_value_set_boolean (value, priv->rotatable);
+ break;
+ case PROP_ZOOMABLE:
+ g_value_set_boolean (value, priv->zoomable);
+ break;
+ case PROP_TRANSITIONS_ENABLED:
+ g_value_set_boolean (value, priv->transitions_enabled);
+ break;
+ case PROP_HADJUSTMENT:
+ g_value_set_object (value, priv->hadjustment);
+ break;
+ case PROP_VADJUSTMENT:
+ g_value_set_object (value, priv->vadjustment);
+ break;
+ case PROP_HSCROLL_POLICY:
+ g_value_set_enum (value, priv->hscroll_policy);
+ break;
+ case PROP_VSCROLL_POLICY:
+ g_value_set_enum (value, priv->vscroll_policy);
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ }
+}
+
+static void
+gtk_image_view_finalize (GObject *object)
+{
+ GtkImageView *self = (GtkImageView *)object;
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+
+ g_clear_object (&priv->rotate_gesture);
+ g_clear_object (&priv->zoom_gesture);
+ g_clear_object (&priv->zoom_controller);
+
+ g_clear_object (&priv->hadjustment);
+ g_clear_object (&priv->vadjustment);
+
+ if (priv->paintable)
+ {
+ g_signal_handlers_disconnect_by_func (priv->paintable,
+ G_CALLBACK (paintable_contents_changed_cb), self);
+ g_clear_object (&priv->paintable);
+ }
+
+ G_OBJECT_CLASS (gtk_image_view_parent_class)->finalize (object);
+}
+
+static void
+gtk_image_view_class_init (GtkImageViewClass *view_class)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (view_class);
+ GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (view_class);
+
+ object_class->set_property = gtk_image_view_set_property;
+ object_class->get_property = gtk_image_view_get_property;
+ object_class->finalize = gtk_image_view_finalize;
+
+ widget_class->measure = gtk_image_view_measure;
+ widget_class->size_allocate = gtk_image_view_size_allocate;
+ widget_class->snapshot = gtk_image_view_snapshot;
+
+ /**
+ * GtkImageView:scale:
+ * The scale the internal surface gets drawn with.
+ *
+ * Since: 4.0
+ */
+ widget_props[PROP_SCALE] = g_param_spec_double ("scale",
+ P_("Scale"),
+ P_("The scale the internal surface gets drawn with"),
+ 0.0,
+ G_MAXDOUBLE,
+ 1.0,
+ GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
+ /**
+ * GtkImageView:scale-set:
+ * Whether or not the current value of the scale property was set by the user.
+ * This is to distringuish between scale values set by the #GtkImageView itself,
+ * e.g. when #GtkImageView:fit-allocation is true, which will change the scale
+ * depending on the widget allocation.
+ *
+ * Since: 4.0
+ */
+ widget_props[PROP_SCALE_SET] = g_param_spec_boolean ("scale-set",
+ P_("Scale Set"),
+ P_("Wheter the scale property has been set by the
user or by GtkImageView itself"),
+ FALSE,
+ GTK_PARAM_READABLE|G_PARAM_EXPLICIT_NOTIFY);
+ /**
+ * GtkImageView:angle:
+ * The angle the surface gets rotated about.
+ * This is in degrees and we rotate clock-wise.
+ *
+ * Since: 4.0
+ */
+ widget_props[PROP_ANGLE] = g_param_spec_double ("angle",
+ P_("Angle"),
+ P_("The angle the internal surface gets rotated about"),
+ 0.0,
+ 360.0,
+ 0.0,
+ GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
+ /**
+ * GtkImageView:rotatable:
+ * Whether or not the image can be rotated using a two-finger rotate gesture.
+ *
+ * Since: 4.0
+ */
+ widget_props[PROP_ROTATABLE] = g_param_spec_boolean ("rotatable",
+ P_("Rotatable"),
+ P_("Controls user-rotatability"),
+ TRUE,
+ GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
+/**
+ * GtkImageView:zoomable:
+ * Whether or not the image can be scaled using a two-finger zoom gesture, as well as
+ * scrolling on the #GtkImageView.
+ *
+ * Since: 4.0
+ */
+ widget_props[PROP_ZOOMABLE] = g_param_spec_boolean ("zoomable",
+ P_("Zoomable"),
+ P_("Controls user-zoomability"),
+ TRUE,
+ GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
+/**
+ * GtkImageView:snap-angle:
+ * Whether or not the angle property snaps to 90° steps. If this is enabled
+ * and the angle property gets set to a non-90° step, the new value will be
+ * set to the closest 90° step. If #GtkImageView:transitions-enabled is %TRUE,
+ * the angle change from the current angle to the new angle will be interpolated.
+ *
+ * Since: 4.0
+ */
+ widget_props[PROP_SNAP_ANGLE] = g_param_spec_boolean ("snap-angle",
+ P_("Snap Angle"),
+ P_("Snap angle to 90° steps"),
+ FALSE,
+ GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
+
+ /**
+ * GtkImageView:fit-allocation:
+ * If this is %TRUE, the scale the image will be drawn in will depend on the current
+ * widget allocation. The image will be scaled down to fit into the widget allocation,
+ * but never scaled up. The aspect ratio of the image will be kept at all times.
+ *
+ * Since: 4.0
+ */
+ widget_props[PROP_FIT_ALLOCATION] = g_param_spec_boolean ("fit-allocation",
+ P_("Fit Allocation"),
+ P_("Scale the image down to fit into the widget
allocation"),
+ FALSE,
+ GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
+
+ /**
+ * GtkImageView:transitions-enabled
+ *
+ * Whether or not certain property changes will be interpolated. This affects a variety
+ * of function calls on a #GtkImageView instance, e.g. setting the angle property, the
+ * scale property, but also the angle snapping in case #GtkImageView:snap-angle is set.
+ *
+ * Note that the transitions in #GtkImageView never apply to the actual property values
+ * set and instead interpolate between the visual angle/scale, so you cannot depend on
+ * getting 60 notify signal emissions per second.
+ *
+ * Since: 4.0
+ */
+ widget_props[PROP_TRANSITIONS_ENABLED] = g_param_spec_boolean ("transitions-enabled",
+ P_("Transitions Enabled"),
+ P_("Whether scale and angle changes get
interpolated"),
+ TRUE,
+
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
+
+ g_object_class_install_properties (object_class, LAST_WIDGET_PROPERTY, widget_props);
+
+ g_object_class_override_property (object_class, PROP_HADJUSTMENT, "hadjustment");
+ g_object_class_override_property (object_class, PROP_VADJUSTMENT, "vadjustment");
+ g_object_class_override_property (object_class, PROP_HSCROLL_POLICY, "hscroll-policy");
+ g_object_class_override_property (object_class, PROP_VSCROLL_POLICY, "vscroll-policy");
+
+ gtk_widget_class_set_css_name (widget_class, "imageview");
+}
+
+/**
+ * gtk_image_view_new:
+ *
+ * Returns: A newly created #GtkImageView instance.
+ *
+ * Since: 4.0
+ */
+GtkWidget *
+gtk_image_view_new (void)
+{
+ return g_object_new (GTK_TYPE_IMAGE_VIEW, NULL);
+}
+
+static void
+gtk_image_view_replace_paintable (GtkImageView *self,
+ GdkPaintable *paintable)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (self);
+
+ if (priv->paintable)
+ {
+ g_signal_handlers_disconnect_by_func (priv->paintable, G_CALLBACK (paintable_contents_changed_cb),
self);
+ g_object_unref (priv->paintable);
+ }
+
+ priv->paintable = paintable;
+
+ if (priv->paintable)
+ {
+ g_object_ref (priv->paintable);
+ g_signal_connect (priv->paintable, "invalidate-contents",
+ G_CALLBACK (paintable_contents_changed_cb), self);
+ }
+
+ gtk_image_view_update_adjustments (self);
+
+ gtk_image_view_invalidate (self);
+}
+
+static GdkPaintable *
+gtk_image_view_load_image_from_stream (GtkImageView *self,
+ GInputStream *input_stream,
+ GCancellable *cancellable,
+ GError *error)
+{
+ GdkPixbufAnimation *result;
+ GdkPaintable *paintable = NULL;
+
+ g_assert (error == NULL);
+ result = gdk_pixbuf_animation_new_from_stream (input_stream,
+ cancellable,
+ &error);
+
+ if (!error)
+ {
+ GdkPixbuf *frame = gdk_pixbuf_animation_get_static_image (result);
+
+ paintable = GDK_PAINTABLE (gdk_texture_new_for_pixbuf (frame));
+ g_object_unref (result);
+ }
+
+ g_input_stream_close (input_stream, NULL, NULL);
+ g_object_unref (input_stream);
+
+ return paintable;
+}
+
+/* CALLED FROM ANOTHER THREAD */
+static void
+gtk_image_view_load_image_contents (GTask *task,
+ gpointer source_object,
+ gpointer task_data,
+ GCancellable *cancellable)
+{
+ GtkImageView *self = source_object;
+ GFile *file = G_FILE (task_data);
+ GFileInputStream *in_stream;
+ GdkPaintable *paintable;
+ GError *error = NULL;
+
+ in_stream = g_file_read (file, cancellable, &error);
+
+ if (error)
+ {
+ /* in_stream is NULL */
+ g_task_return_error (task, error);
+ return;
+ }
+
+ /* Closes and unrefs the input stream */
+ paintable = gtk_image_view_load_image_from_stream (self,
+ G_INPUT_STREAM (in_stream),
+ cancellable,
+ error);
+
+ if (error)
+ g_task_return_error (task, error);
+ else
+ g_task_return_pointer (task, paintable, NULL);
+}
+
+/* CALLED FROM ANOTHER THREAD */
+static void
+gtk_image_view_load_from_input_stream (GTask *task,
+ gpointer source_object,
+ gpointer task_data,
+ GCancellable *cancellable)
+{
+ GtkImageView *self = source_object;
+ GInputStream *in_stream = task_data;
+ GdkPaintable *paintable;
+ GError *error = NULL;
+
+ /* Closes and unrefs the input stream */
+ paintable = gtk_image_view_load_image_from_stream (self,
+ in_stream,
+ cancellable,
+ error);
+
+ if (error)
+ g_task_return_error (task, error);
+ else
+ g_task_return_pointer (task, paintable, NULL);
+}
+
+/**
+ * gtk_image_view_load_from_file_async:
+ * @self: A #GtkImageView instance
+ * @file: (transfer full): The file to read from
+ * @cancellable: (nullable): A #GCancellable that can be used to
+ * cancel the loading operation
+ * @callback: (scope async): Callback to call once the operation finished
+ * @user_data: (closure): Data to pass to @callback
+ *
+ * Asynchronously loads an image from the given file.
+ *
+ * Since: 4.0
+ */
+void
+gtk_image_view_load_from_file_async (GtkImageView *self,
+ GFile *file,
+ GCancellable *cancellable,
+ GAsyncReadyCallback callback,
+ gpointer user_data)
+{
+ GTask *task;
+
+ g_return_if_fail (GTK_IS_IMAGE_VIEW (self));
+ g_return_if_fail (G_IS_FILE (file));
+
+ task = g_task_new (self, cancellable, callback, user_data);
+ g_task_set_task_data (task, g_object_ref (file), g_object_unref);
+ g_task_run_in_thread (task, gtk_image_view_load_image_contents);
+
+ g_object_unref (task);
+}
+
+/**
+ * gtk_image_view_load_from_file_finish:
+ * @self: A #GtkImageView instance
+ * @result: A #GAsyncResult
+ * @error: (nullable): Location to store error information in case the operation fails
+ *
+ * Finished an asynchronous operation started with gtk_image_view_load_from_file_async().
+ *
+ * Returns: %TRUE if the operation succeeded, %FALSE otherwise,
+ * in which case @error will be set.
+ *
+ * Since: 4.0
+ */
+gboolean
+gtk_image_view_load_from_file_finish (GtkImageView *self,
+ GAsyncResult *result,
+ GError **error)
+{
+ GdkPaintable *paintable;
+ g_return_val_if_fail (g_task_is_valid (result, self), FALSE);
+
+ paintable = g_task_propagate_pointer (G_TASK (result), error);
+ gtk_image_view_set_paintable (self, paintable);
+
+ return paintable != NULL;
+}
+
+/**
+ * gtk_image_view_load_from_stream_async:
+ * @self: A #GtkImageView instance
+ * @input_stream: (transfer full): Input stream to read from
+ * @cancellable: (nullable): The #GCancellable used to cancel the operation
+ * @callback: (scope async): A #GAsyncReadyCallback invoked when the operation finishes
+ * @user_data: (closure): The data to pass to @callback
+ *
+ * Asynchronously loads an image from the given input stream.
+ *
+ * Since: 4.0
+ */
+void
+gtk_image_view_load_from_stream_async (GtkImageView *self,
+ GInputStream *input_stream,
+ GCancellable *cancellable,
+ GAsyncReadyCallback callback,
+ gpointer user_data)
+{
+ GTask *task;
+
+ g_return_if_fail (GTK_IS_IMAGE_VIEW (self));
+ g_return_if_fail (G_IS_INPUT_STREAM (input_stream));
+
+ task = g_task_new (self, cancellable, callback, user_data);
+ g_task_set_task_data (task, g_object_ref (input_stream), g_object_unref);
+ g_task_run_in_thread (task, gtk_image_view_load_from_input_stream);
+
+ g_object_unref (task);
+}
+
+/**
+ * gtk_image_view_load_from_stream_finish:
+ * @self: A #GtkImageView instance
+ * @result: A #GAsyncResult
+ * @error: (nullable): Location to store error information on failure
+ *
+ * Finishes an asynchronous operation started by gtk_image_view_load_from_stream_async().
+ *
+ * Returns: %TRUE if the operation finished successfully, %FALSE otherwise.
+ *
+ * Since: 4.0
+ */
+gboolean
+gtk_image_view_load_from_stream_finish (GtkImageView *self,
+ GAsyncResult *result,
+ GError **error)
+{
+ GdkPaintable *paintable;
+
+ g_return_val_if_fail (g_task_is_valid (result, self), FALSE);
+
+ paintable = g_task_propagate_pointer (G_TASK (result), error);
+ gtk_image_view_set_paintable (self, paintable);
+
+ return paintable != NULL;
+}
+
+/**
+ * gtk_image_view_set_paintable:
+ * @self: A #GtkImageView instance
+ * @paintable: (nullable): The #GdkPaintable to set, or %NULL
+ * to unset any currently set contents
+ *
+ * Replate the current contents of the image view with the given paintable
+ *
+ * Since: 4.0
+ */
+void
+gtk_image_view_set_paintable (GtkImageView *self,
+ GdkPaintable *paintable)
+{
+ g_return_if_fail (GTK_IS_IMAGE_VIEW (self));
+ g_return_if_fail (paintable == NULL || GDK_IS_PAINTABLE (paintable));
+
+ gtk_image_view_replace_paintable (self, paintable);
+}
diff --git a/gtk/gtkimageview.h b/gtk/gtkimageview.h
new file mode 100644
index 0000000000..433310df5c
--- /dev/null
+++ b/gtk/gtkimageview.h
@@ -0,0 +1,116 @@
+/* Copyright 2018 Timm Bäder
+ *
+ * GTK+ is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * GLib is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with GTK+; see the file COPYING. If not,
+ * see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GTK_IMAGE_VIEW_H__
+#define __GTK_IMAGE_VIEW_H__
+
+#if !defined (__GTK_H_INSIDE__) && !defined (GTK_COMPILATION)
+#error "Only <gtk/gtk.h> can be included directly."
+#endif
+
+#include <gtk/gtkwidget.h>
+
+G_BEGIN_DECLS
+
+#define GTK_TYPE_IMAGE_VIEW (gtk_image_view_get_type ())
+#define GTK_IMAGE_VIEW(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GTK_TYPE_IMAGE_VIEW,
GtkImageView))
+#define GTK_IMAGE_VIEW_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GTK_TYPE_IMAGE_VIEW,
GtkImageViewClass))
+#define GTK_IS_IMAGE_VIEW(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GTK_TYPE_IMAGE_VIEW))
+#define GTK_IS_IMAGE_VIEW_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GTK_TYPE_IMAGE_VIEW))
+#define GTK_IMAGE_VIEW_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_IMAGE_VIEW,
GtkImageViewClass))
+
+typedef struct _GtkImageView GtkImageView;
+typedef struct _GtkImageViewClass GtkImageViewClass;
+
+struct _GtkImageView
+{
+ GtkWidget parent_instance;
+};
+
+struct _GtkImageViewClass
+{
+ GtkWidgetClass parent_class;
+};
+
+
+GDK_AVAILABLE_IN_ALL
+GType gtk_image_view_get_type (void) G_GNUC_CONST;
+GDK_AVAILABLE_IN_ALL
+GtkWidget * gtk_image_view_new (void);
+GDK_AVAILABLE_IN_ALL
+void gtk_image_view_load_from_file_async (GtkImageView *self,
+ GFile *file,
+ GCancellable *cancellable,
+ GAsyncReadyCallback callback,
+ gpointer user_data);
+GDK_AVAILABLE_IN_ALL
+gboolean gtk_image_view_load_from_file_finish (GtkImageView *self,
+ GAsyncResult *result,
+ GError **error);
+GDK_AVAILABLE_IN_ALL
+void gtk_image_view_load_from_stream_async (GtkImageView *self,
+ GInputStream *input_stream,
+ GCancellable *cancellable,
+ GAsyncReadyCallback callback,
+ gpointer user_data);
+GDK_AVAILABLE_IN_ALL
+gboolean gtk_image_view_load_from_stream_finish (GtkImageView *self,
+ GAsyncResult *result,
+ GError **error);
+GDK_AVAILABLE_IN_ALL
+void gtk_image_view_set_scale (GtkImageView *self,
+ double scale);
+GDK_AVAILABLE_IN_ALL
+double gtk_image_view_get_scale (GtkImageView *self);
+GDK_AVAILABLE_IN_ALL
+void gtk_image_view_set_angle (GtkImageView *self,
+ double angle);
+GDK_AVAILABLE_IN_ALL
+double gtk_image_view_get_angle (GtkImageView *self);
+GDK_AVAILABLE_IN_ALL
+void gtk_image_view_set_snap_angle (GtkImageView *self,
+ gboolean snap_angle);
+GDK_AVAILABLE_IN_ALL
+gboolean gtk_image_view_get_snap_angle (GtkImageView *self);
+GDK_AVAILABLE_IN_ALL
+void gtk_image_view_set_fit_allocation (GtkImageView *self,
+ gboolean fit_allocation);
+GDK_AVAILABLE_IN_ALL
+gboolean gtk_image_view_get_fit_allocation (GtkImageView *self);
+GDK_AVAILABLE_IN_ALL
+void gtk_image_view_set_rotatable (GtkImageView *self,
+ gboolean rotatable);
+GDK_AVAILABLE_IN_ALL
+gboolean gtk_image_view_get_rotatable (GtkImageView *self);
+GDK_AVAILABLE_IN_ALL
+void gtk_image_view_set_zoomable (GtkImageView *self,
+ gboolean zoomable);
+GDK_AVAILABLE_IN_ALL
+gboolean gtk_image_view_get_zoomable (GtkImageView *self);
+GDK_AVAILABLE_IN_ALL
+gboolean gtk_image_view_get_scale_set (GtkImageView *self);
+GDK_AVAILABLE_IN_ALL
+void gtk_image_view_set_transitions_enabled (GtkImageView *self,
+ gboolean transitions_enabled);
+GDK_AVAILABLE_IN_ALL
+gboolean gtk_image_view_get_transitions_enabled (GtkImageView *self);
+GDK_AVAILABLE_IN_ALL
+void gtk_image_view_set_paintable (GtkImageView *self,
+ GdkPaintable *paintable);
+G_END_DECLS
+
+#endif
diff --git a/gtk/gtkwidgetprivate.h b/gtk/gtkwidgetprivate.h
index 0cadb237fb..42fa6686bf 100644
--- a/gtk/gtkwidgetprivate.h
+++ b/gtk/gtkwidgetprivate.h
@@ -74,6 +74,7 @@ struct _GtkWidgetPrivate
guint child_visible : 1;
guint multidevice : 1;
guint pass_through : 1;
+ guint in_size_allocate :1;
/* Queue-resize related flags */
guint resize_needed : 1; /* queue_resize() has been called but no get_preferred_size() yet */
diff --git a/gtk/meson.build b/gtk/meson.build
index 96a0c4283f..a79c5de876 100644
--- a/gtk/meson.build
+++ b/gtk/meson.build
@@ -256,6 +256,7 @@ gtk_public_sources = files([
'gtkiconview.c',
'gtkimage.c',
'gtkimagedefinition.c',
+ 'gtkimageview.c',
'gtkimcontext.c',
'gtkimcontextsimple.c',
'gtkimmodule.c',
@@ -504,6 +505,7 @@ gtk_public_headers = files([
'gtkiconview.h',
'gtkimage.h',
'gtkimcontext.h',
+ 'gtkimageview.h',
'gtkimcontextsimple.h',
'gtkimmodule.h',
'gtkimmulticontext.h',
diff --git a/testsuite/gtk/imageview-size.c b/testsuite/gtk/imageview-size.c
new file mode 100644
index 0000000000..3ae81eec35
--- /dev/null
+++ b/testsuite/gtk/imageview-size.c
@@ -0,0 +1,178 @@
+#include <gtk/gtk.h>
+
+
+void
+empty ()
+{
+ int min, nat;
+ GtkWidget *iv = gtk_image_view_new ();
+ gtk_widget_show (iv);
+
+ gtk_widget_measure (iv, GTK_ORIENTATION_HORIZONTAL, -1, &min, &nat, NULL, NULL);
+ g_assert_cmpint (min, ==, 0);
+ g_assert_cmpint (nat, ==, 0);
+
+ gtk_widget_measure (iv, GTK_ORIENTATION_VERTICAL, -1, &min, &nat, NULL, NULL);
+ g_assert_cmpint (min, ==, 0);
+ g_assert_cmpint (nat, ==, 0);
+}
+
+void
+image_fit_allocation ()
+{
+ int min, nat;
+ GtkWidget *iv;
+ GdkPixbuf *pic;
+ GdkTexture *texture;
+
+ iv = gtk_image_view_new ();
+ pic = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, 100, 200);
+ texture = gdk_texture_new_for_pixbuf (pic);
+ gtk_image_view_set_paintable (GTK_IMAGE_VIEW (iv), GDK_PAINTABLE (texture));
+ gtk_image_view_set_fit_allocation (GTK_IMAGE_VIEW (iv), TRUE);
+
+ gtk_widget_measure (iv, GTK_ORIENTATION_HORIZONTAL, -1, &min, &nat, NULL, NULL);
+ g_assert_cmpint (min, ==, 0);
+ g_assert_cmpint (nat, ==, gdk_pixbuf_get_width (pic));
+
+ gtk_widget_measure (iv, GTK_ORIENTATION_VERTICAL, -1, &min, &nat, NULL, NULL);
+ g_assert_cmpint (min, ==, 0);
+ g_assert_cmpint (nat, ==, gdk_pixbuf_get_height (pic));
+}
+
+void
+image_no_fit_allocation ()
+{
+ int min, nat;
+ GtkWidget *iv;
+ GdkPixbuf *pic;
+ GdkTexture *texture;
+
+ iv = gtk_image_view_new ();
+ pic = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, 100, 200);
+ texture = gdk_texture_new_for_pixbuf (pic);
+ gtk_image_view_set_paintable (GTK_IMAGE_VIEW (iv), GDK_PAINTABLE (texture));
+
+ gtk_widget_measure (iv, GTK_ORIENTATION_HORIZONTAL, -1, &min, &nat, NULL, NULL);
+ g_assert_cmpint (min, ==, gdk_pixbuf_get_width (pic));
+ g_assert_cmpint (nat, ==, gdk_pixbuf_get_width (pic));
+
+ gtk_widget_measure (iv, GTK_ORIENTATION_VERTICAL, -1, &min, &nat, NULL, NULL);
+ g_assert_cmpint (min, ==, gdk_pixbuf_get_height (pic));
+ g_assert_cmpint (nat, ==, gdk_pixbuf_get_height (pic));
+}
+
+void
+image_scaled ()
+{
+ int min, nat;
+ GtkWidget *iv;
+ GdkPixbuf *pic;
+ GdkTexture *texture;
+
+ iv = gtk_image_view_new ();
+ pic = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, 100, 200);
+ texture = gdk_texture_new_for_pixbuf (pic);
+ gtk_image_view_set_paintable (GTK_IMAGE_VIEW (iv), GDK_PAINTABLE (texture));
+
+ gtk_widget_measure (iv, GTK_ORIENTATION_HORIZONTAL, -1, &min, &nat, NULL, NULL);
+ g_assert_cmpint (min, ==, gdk_pixbuf_get_width (pic));
+ g_assert_cmpint (nat, ==, gdk_pixbuf_get_width (pic));
+
+ gtk_widget_measure (iv, GTK_ORIENTATION_VERTICAL, -1, &min, &nat, NULL, NULL);
+ g_assert_cmpint (min, ==, gdk_pixbuf_get_height (pic));
+ g_assert_cmpint (nat, ==, gdk_pixbuf_get_height (pic));
+
+ gtk_image_view_set_scale (GTK_IMAGE_VIEW (iv), 2.0);
+
+ gtk_widget_measure (iv, GTK_ORIENTATION_HORIZONTAL, -1, &min, &nat, NULL, NULL);
+ g_assert_cmpint (min, ==, gdk_pixbuf_get_width (pic) * 2.0);
+ g_assert_cmpint (nat, ==, gdk_pixbuf_get_width (pic) * 2.0);
+
+ gtk_widget_measure (iv, GTK_ORIENTATION_VERTICAL, -1, &min, &nat, NULL, NULL);
+ g_assert_cmpint (min, ==, gdk_pixbuf_get_height (pic) * 2.0);
+ g_assert_cmpint (nat, ==, gdk_pixbuf_get_height (pic) * 2.0);
+
+
+ gtk_image_view_set_scale (GTK_IMAGE_VIEW (iv), 0.5);
+
+ gtk_widget_measure (iv, GTK_ORIENTATION_HORIZONTAL, -1, &min, &nat, NULL, NULL);
+ g_assert_cmpint (min, ==, gdk_pixbuf_get_width (pic) * 0.5);
+ g_assert_cmpint (nat, ==, gdk_pixbuf_get_width (pic) * 0.5);
+
+ gtk_widget_measure (iv, GTK_ORIENTATION_VERTICAL, -1, &min, &nat, NULL, NULL);
+ g_assert_cmpint (min, ==, gdk_pixbuf_get_height (pic) * 0.5);
+ g_assert_cmpint (nat, ==, gdk_pixbuf_get_height (pic) * 0.5);
+}
+
+void
+image_rotated ()
+{
+ int min, nat;
+ GtkWidget *iv;
+ GdkPixbuf *pic;
+ GdkTexture *texture;
+
+ iv = gtk_image_view_new ();
+ pic = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, 100, 200);
+ texture = gdk_texture_new_for_pixbuf (pic);
+ gtk_image_view_set_paintable (GTK_IMAGE_VIEW (iv), GDK_PAINTABLE (texture));
+ gtk_image_view_set_angle (GTK_IMAGE_VIEW (iv), 90.0);
+
+ gtk_widget_measure (iv, GTK_ORIENTATION_HORIZONTAL, -1, &min, &nat, NULL, NULL);
+ g_assert_cmpint (min, ==, gdk_pixbuf_get_height (pic));
+ g_assert_cmpint (nat, ==, gdk_pixbuf_get_height (pic));
+
+ gtk_widget_measure (iv, GTK_ORIENTATION_VERTICAL, -1, &min, &nat, NULL, NULL);
+ g_assert_cmpint (min, ==, gdk_pixbuf_get_width (pic));
+ g_assert_cmpint (nat, ==, gdk_pixbuf_get_width (pic));
+}
+
+void
+image_rotated_scaled ()
+{
+ int min, nat;
+ GtkWidget *iv;
+ GdkPixbuf *pic;
+ GdkTexture *texture;
+
+ iv = gtk_image_view_new ();
+ pic = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, 100, 200);
+ texture = gdk_texture_new_for_pixbuf (pic);
+ gtk_image_view_set_paintable (GTK_IMAGE_VIEW (iv), GDK_PAINTABLE (texture));
+ gtk_image_view_set_angle (GTK_IMAGE_VIEW (iv), 90.0);
+
+ gtk_widget_measure (iv, GTK_ORIENTATION_HORIZONTAL, -1, &min, &nat, NULL, NULL);
+ g_assert_cmpint (min, ==, gdk_pixbuf_get_height (pic));
+ g_assert_cmpint (nat, ==, gdk_pixbuf_get_height (pic));
+
+ gtk_widget_measure (iv, GTK_ORIENTATION_VERTICAL, -1, &min, &nat, NULL, NULL);
+ g_assert_cmpint (min, ==, gdk_pixbuf_get_width (pic));
+ g_assert_cmpint (nat, ==, gdk_pixbuf_get_width (pic));
+
+ gtk_image_view_set_scale (GTK_IMAGE_VIEW (iv), 0.5);
+
+ gtk_widget_measure (iv, GTK_ORIENTATION_HORIZONTAL, -1, &min, &nat, NULL, NULL);
+ g_assert_cmpint (min, ==, gdk_pixbuf_get_height (pic) * 0.5);
+ g_assert_cmpint (nat, ==, gdk_pixbuf_get_height (pic) * 0.5);
+
+ gtk_widget_measure (iv, GTK_ORIENTATION_VERTICAL, -1, &min, &nat, NULL, NULL);
+ g_assert_cmpint (min, ==, gdk_pixbuf_get_width (pic) * 0.5);
+ g_assert_cmpint (nat, ==, gdk_pixbuf_get_width (pic) * 0.5);
+}
+
+int
+main (int argc, char **argv)
+{
+ gtk_init ();
+ g_test_init (&argc, &argv, NULL);
+
+ g_test_add_func ("/sizing/imageview/empty", empty);
+ g_test_add_func ("/sizing/imageview/image-fit-allocation", image_fit_allocation);
+ g_test_add_func ("/sizing/imageview/image-no-fit-allocation", image_no_fit_allocation);
+ g_test_add_func ("/sizing/imageview/image-scaled", image_scaled);
+ g_test_add_func ("/sizing/imageview/image-rotated", image_rotated);
+ g_test_add_func ("/sizing/imageview/image-rotated-scaled", image_rotated_scaled);
+
+ return g_test_run ();
+}
diff --git a/testsuite/gtk/meson.build b/testsuite/gtk/meson.build
index d86e035eff..160a4ff490 100644
--- a/testsuite/gtk/meson.build
+++ b/testsuite/gtk/meson.build
@@ -60,6 +60,7 @@ tests = [
['displayclose'],
['revealer-size'],
['widgetorder'],
+ ['imageview-size'],
]
test_cargs = []
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