[gtk+/wip/baedert/gtkimageview: 29/96] GtkImageView: Add docs
- From: Timm Bäder <baedert src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gtk+/wip/baedert/gtkimageview: 29/96] GtkImageView: Add docs
- Date: Mon, 25 Jan 2016 17:56:39 +0000 (UTC)
commit 3a8bebf370725fcc8b4f7c66d8359070b6d2f3b8
Author: Timm Bäder <mail baedert org>
Date: Mon Jul 27 18:29:55 2015 +0200
GtkImageView: Add docs
and implement h/vscroll-policy, add a "draw on surface" demo, etc.
demos/gtk-demo/image_view.c | 29 ++++++
gtk/gtkimageview.c | 225 ++++++++++++++++++++++++++++++++-----------
2 files changed, 197 insertions(+), 57 deletions(-)
---
diff --git a/demos/gtk-demo/image_view.c b/demos/gtk-demo/image_view.c
index 5c77820..22576e3 100644
--- a/demos/gtk-demo/image_view.c
+++ b/demos/gtk-demo/image_view.c
@@ -163,6 +163,31 @@ clear_button_clicked_cb ()
gtk_image_view_set_surface (GTK_IMAGE_VIEW (image_view), NULL);
}
+void
+prepare_image_cb (GtkImageView *image_view,
+ cairo_surface_t *surface)
+{
+ cairo_t *ct;
+ int width;
+ int height;
+
+ g_assert (GTK_IS_IMAGE_VIEW (image_view));
+
+ g_assert (surface != NULL);
+ g_assert (cairo_surface_get_type (surface) == CAIRO_SURFACE_TYPE_IMAGE);
+
+
+ ct = cairo_create (surface);
+ width = cairo_image_surface_get_width (surface);
+ height = cairo_image_surface_get_height (surface);
+
+
+ cairo_set_source_rgba (ct, 0, 1, 0, 1);
+ cairo_set_line_width (ct, 5.0);
+ cairo_rectangle (ct, 0, 0, width, height);
+ cairo_stroke (ct);
+}
+
GtkWidget *
do_image_view (GtkWidget *do_widget)
@@ -181,6 +206,10 @@ do_image_view (GtkWidget *do_widget)
GtkAdjustment *scale_adjustment = GTK_ADJUSTMENT (gtk_builder_get_object (builder, "scale_adjustment"));
GtkAdjustment *angle_adjustment = GTK_ADJUSTMENT (gtk_builder_get_object (builder, "angle_adjustment"));
+
+ g_signal_connect (G_OBJECT (image_view), "prepare-image", G_CALLBACK (prepare_image_cb), NULL);
+
+
g_object_bind_property (scale_adjustment, "value", image_view, "scale",
G_BINDING_BIDIRECTIONAL);
g_object_bind_property (image_view, "angle", angle_adjustment, "value",
diff --git a/gtk/gtkimageview.c b/gtk/gtkimageview.c
index 49f25a2..5e1cba0 100644
--- a/gtk/gtkimageview.c
+++ b/gtk/gtkimageview.c
@@ -46,7 +46,6 @@ struct _GtkImageViewPrivate
GdkPixbufAnimation *source_animation;
GdkPixbufAnimationIter *source_animation_iter;
cairo_surface_t *image_surface;
- int surface_width;
int surface_height;
int animation_timeout;
@@ -57,8 +56,7 @@ struct _GtkImageViewPrivate
};
// XXX animate image size changes!
-//
-// XXX Don't track the surface size
+// XXX Check scale-factor implementation for correctness
enum
{
@@ -134,8 +132,6 @@ gtk_image_view_init (GtkImageView *image_view)
priv->scale = 1.0;
priv->angle = 0.0;
- priv->surface_width = -1;
- priv->surface_height = -1;
priv->snap_angle = FALSE;
priv->fit_allocation = FALSE;
priv->scale_set = FALSE;
@@ -312,8 +308,8 @@ gtk_image_view_compute_bounding_box (GtkImageView *image_view,
}
gtk_widget_get_allocation ((GtkWidget *)image_view, &alloc);
- image_width = priv->surface_width;
- image_height = priv->surface_height;
+ image_width = cairo_image_surface_get_width (priv->image_surface);
+ image_height = cairo_image_surface_get_height (priv->image_surface);
upper_right_degrees = DEG_TO_RAD (priv->angle) + atan ((double)image_height / (double)image_width);
upper_left_degrees = DEG_TO_RAD (priv->angle) + atan ((double)image_height / -(double)image_width);
@@ -403,17 +399,25 @@ gtk_image_view_update_adjustments (GtkImageView *image_view)
if (!priv->image_surface)
{
- gtk_adjustment_configure (priv->hadjustment, 0, 0, 0, 0, 0, 0);
- gtk_adjustment_configure (priv->vadjustment, 0, 0, 0, 0, 0, 0);
+ /* XXX Rework this so the scrollbars just take max size? */
+ if (priv->hadjustment)
+ gtk_adjustment_configure (priv->hadjustment, 0, 0, 0, 0, 0, 0);
+
+ if (priv->vadjustment)
+ gtk_adjustment_configure (priv->vadjustment, 0, 0, 0, 0, 0, 0);
return;
}
+
if (priv->fit_allocation)
{
- gtk_adjustment_set_upper (priv->hadjustment, widget_width);
- gtk_adjustment_set_upper (priv->vadjustment, widget_height);
+ if (priv->hadjustment)
+ gtk_adjustment_set_upper (priv->hadjustment, widget_width);
+
+ if (priv->vadjustment)
+ gtk_adjustment_set_upper (priv->vadjustment, widget_height);
}
else
{
@@ -422,16 +426,26 @@ gtk_image_view_update_adjustments (GtkImageView *image_view)
&width,
&height,
NULL);
- gtk_adjustment_set_upper (priv->hadjustment, MAX (width, widget_width));
- gtk_adjustment_set_upper (priv->vadjustment, MAX (height, widget_height));
+
+ if (priv->hadjustment)
+ gtk_adjustment_set_upper (priv->hadjustment, MAX (width, widget_width));
+
+ if (priv->vadjustment)
+ gtk_adjustment_set_upper (priv->vadjustment, MAX (height, widget_height));
}
- gtk_adjustment_set_page_size (priv->hadjustment, widget_width);
- gtk_adjustment_set_page_size (priv->vadjustment, widget_height);
+ if (priv->hadjustment)
+ {
+ gtk_adjustment_set_page_size (priv->hadjustment, widget_width);
+ gtk_image_view_restrict_adjustment (priv->hadjustment);
+ }
- gtk_image_view_restrict_adjustment (priv->hadjustment);
- gtk_image_view_restrict_adjustment (priv->vadjustment);
+ if (priv->vadjustment)
+ {
+ gtk_adjustment_set_page_size (priv->vadjustment, widget_height);
+ gtk_image_view_restrict_adjustment (priv->vadjustment);
+ }
}
static gboolean
@@ -462,8 +476,8 @@ gtk_image_view_draw (GtkWidget *widget, cairo_t *ct)
return GDK_EVENT_PROPAGATE;
- int image_width = priv->surface_width * scale;
- int image_height = priv->surface_height * scale;
+ int image_width = cairo_image_surface_get_width (priv->image_surface) * scale;
+ int image_height = cairo_image_surface_get_height (priv->image_surface) * scale;
#if 0
cairo_save (ct);
@@ -549,6 +563,10 @@ gtk_image_view_set_hadjustment (GtkImageView *image_view,
priv->hadjustment = hadjustment;
}
+ g_object_notify ((GObject *)image_view, "hadjustment");
+
+ gtk_image_view_update_adjustments (image_view);
+
if (priv->fit_allocation)
gtk_widget_queue_draw ((GtkWidget *)image_view);
else
@@ -582,12 +600,41 @@ gtk_image_view_set_vadjustment (GtkImageView *image_view,
priv->vadjustment = vadjustment;
}
+ g_object_notify ((GObject *)image_view, "vadjustment");
+
+ gtk_image_view_update_adjustments (image_view);
+
if (priv->fit_allocation)
gtk_widget_queue_draw ((GtkWidget *)image_view);
else
gtk_widget_queue_resize ((GtkWidget *)image_view);
}
+static void
+gtk_image_view_set_hscroll_policy (GtkImageView *image_view,
+ GtkScrollablePolicy hscroll_policy)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (image_view);
+
+ if (priv->hscroll_policy == hscroll_policy)
+ return;
+
+ priv->hscroll_policy = hscroll_policy;
+ gtk_image_view_update_adjustments (image_view);
+}
+
+static void
+gtk_image_view_set_vscroll_policy (GtkImageView *image_view,
+ GtkScrollablePolicy vscroll_policy)
+{
+ GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (image_view);
+
+ if (priv->vscroll_policy == vscroll_policy)
+ return;
+
+ priv->vscroll_policy = vscroll_policy;
+ gtk_image_view_update_adjustments (image_view);
+}
/**
@@ -997,10 +1044,10 @@ gtk_image_view_set_property (GObject *object,
gtk_image_view_set_vadjustment (image_view, g_value_get_object (value));
break;
case PROP_HSCROLL_POLICY:
- ;
+ gtk_image_view_set_hscroll_policy (image_view, g_value_get_enum (value));
break;
case PROP_VSCROLL_POLICY:
- ;
+ gtk_image_view_set_vscroll_policy (image_view, g_value_get_enum (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
@@ -1037,10 +1084,10 @@ gtk_image_view_get_property (GObject *object,
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);
@@ -1088,20 +1135,41 @@ gtk_image_view_class_init (GtkImageViewClass *view_class)
widget_class->get_preferred_width = gtk_image_view_get_preferred_width;
widget_class->get_preferred_height = gtk_image_view_get_preferred_height;
+ /**
+ * GtkImageView:scale:
+ * The scale the internal surface gets drawn with.
+ *
+ * Since: 3.18
+ */
widget_props[PROP_SCALE] = g_param_spec_double ("scale",
P_("Scale"),
- P_("foobar scale"),
- -G_MAXDOUBLE,
- G_MAXDOUBLE,
+ 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 fit-allocation is true, which will change the scale depeding on the
+ * widget allocation.
+ *
+ * Since: 3.18
+ */
widget_props[PROP_SCALE_SET] = g_param_spec_boolean ("scale-set",
- P_("Foo"),
+ P_(""),
P_("fooar"),
- TRUE,
+ FALSE,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
-
+ /**
+ * GtkImageView:angle:
+ * The angle the surface gets rotated about.
+ * This is in degrees and we rotate in the mathematically negative direction,
+ * i.e. clock wise.
+ *
+ * Since: 3.18
+ */
widget_props[PROP_ANGLE] = g_param_spec_double ("angle",
P_("angle"),
P_("angle"),
@@ -1109,25 +1177,51 @@ gtk_image_view_class_init (GtkImageViewClass *view_class)
G_MAXDOUBLE,
0.0,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
-
+ /**
+ * GtkImageView:rotate-gesture-enabled:
+ * Whether or not the image can be rotated using a two-finger rotate gesture.
+ *
+ * Since: 3.18
+ */
widget_props[PROP_ROTATE_GESTURE_ENABLED] = g_param_spec_boolean ("rotate-gesture-enabled",
P_("Foo"),
P_("fooar"),
TRUE,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
+ /**
+ * GtkImageView:zoom-gesture-enabled:
+ * Whether or not image can be scaled using a two-finger zoom gesture or not.
+ *
+ * Since: 3.18
+ */
widget_props[PROP_ZOOM_GESTURE_ENABLED] = g_param_spec_boolean ("zoom-gesture-enabled",
P_("Foo"),
P_("fooar"),
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 that is lower than the given angle.
+ * Changing the angle from one 90° step to another will be transitioned. XXX
+ *
+ * Since: 3.18
+ */
widget_props[PROP_SNAP_ANGLE] = g_param_spec_boolean ("snap-angle",
P_("Foo"),
P_("fooar"),
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.
+ *
+ * Since: 3.18
+ */
widget_props[PROP_FIT_ALLOCATION] = g_param_spec_boolean ("fit-allocation",
P_("Foo"),
P_("fooar"),
@@ -1135,15 +1229,17 @@ gtk_image_view_class_init (GtkImageViewClass *view_class)
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
-
-
+ /**
+ * GtkImageView::prepare-image:
+ * @image_view: The #GtkImageView instance
+ * @surface: A #cairo_surface_t of type #CAIRO_TYPE_IMAGE_SURFACE.
+ */
widget_signals[PREPARE_IMAGE] = g_signal_new (I_("prepare-image"),
G_TYPE_FROM_CLASS (object_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GtkImageViewClass, prepare_image),
- NULL, NULL,
- _gtk_marshal_VOID__VOID,
- G_TYPE_NONE, 0);
+ NULL, NULL, NULL,
+ G_TYPE_NONE, 1, CAIRO_GOBJECT_TYPE_SURFACE);
g_object_class_install_properties (object_class, LAST_WIDGET_PROPERTY, widget_props);
@@ -1159,7 +1255,6 @@ gtk_image_view_new ()
return g_object_new (GTK_TYPE_IMAGE_VIEW, NULL);
}
-
static void
gtk_image_view_replace_surface (GtkImageView *image_view,
cairo_surface_t *surface,
@@ -1176,8 +1271,8 @@ gtk_image_view_replace_surface (GtkImageView *image_view,
if (surface)
{
cairo_surface_reference (priv->image_surface);
- priv->surface_width = cairo_image_surface_get_width (priv->image_surface);
- priv->surface_height = cairo_image_surface_get_height (priv->image_surface);
+
+ g_signal_emit (image_view, widget_signals[PREPARE_IMAGE], 0, priv->image_surface);
}
}
@@ -1195,15 +1290,16 @@ gtk_image_view_update_surface (GtkImageView *image_view,
int real_height = (new_height * scale_factor) / widget_scale;
if (!priv->image_surface ||
- priv->surface_width != real_width ||
- priv->surface_height != real_height)
+ cairo_image_surface_get_width (priv->image_surface) != real_width ||
+ cairo_image_surface_get_height (priv->image_surface) != real_height)
{
GdkWindow *window = gtk_widget_get_window ((GtkWidget *)image_view);
int surface_scale = gtk_widget_get_scale_factor ((GtkWidget *)image_view);
cairo_surface_t *new_surface = gdk_cairo_surface_create_from_pixbuf (frame,
surface_scale,
window);
-
+ g_assert (new_surface != NULL);
+ /* replace_surface will emit prepare-image */
gtk_image_view_replace_surface (image_view,
new_surface,
surface_scale);
@@ -1211,11 +1307,11 @@ gtk_image_view_update_surface (GtkImageView *image_view,
else
{
gdk_cairo_surface_paint_pixbuf (priv->image_surface, frame);
+ g_signal_emit (image_view, widget_signals[PREPARE_IMAGE], 0, priv->image_surface);
resize = FALSE;
}
g_assert (priv->image_surface != NULL);
- g_signal_emit (image_view, widget_signals[PREPARE_IMAGE], 0, priv->image_surface);
if (resize)
gtk_widget_queue_resize ((GtkWidget *)image_view);
@@ -1260,6 +1356,7 @@ gtk_image_view_replace_animation (GtkImageView *image_view,
}
+
static void
gtk_image_view_load_image_from_stream (GtkImageView *image_view,
GInputStream *input_stream,
@@ -1268,20 +1365,16 @@ gtk_image_view_load_image_from_stream (GtkImageView *image_view,
GError *error)
{
GdkPixbufAnimation *result;
+
+
+ g_assert (error == NULL);
result = gdk_pixbuf_animation_new_from_stream (G_INPUT_STREAM (input_stream),
cancellable,
&error);
g_object_unref (input_stream);
- if (error)
- {
- // XXX
- g_error ("error!");
- }
- else
- {
- gtk_image_view_replace_animation (image_view, result,scale_factor);
- }
+ if (!error)
+ gtk_image_view_replace_animation (image_view, result,scale_factor);
}
static void
@@ -1405,8 +1498,16 @@ gtk_image_view_load_from_stream_finish (GtkImageView *image_view,
g_return_if_fail (g_task_is_valid (result, image_view));
}
-
-
+/*
+ * gtk_image_view_set_pixbuf:
+ * @image_view: A #GtkImageView instance
+ * @pixbuf: A #GdkPixbuf instance
+ * @scale_factor: The scale factor of the pixbuf. This will
+ * be interpreted as "the given pixbuf is supposed to be used
+ * with the given scale factor", i.e. if the pixbuf's scale
+ * factor is 2, and the screen's scale factor is also 2, the
+ * pixbuf won't be scaled up.
+ */
void
gtk_image_view_set_pixbuf (GtkImageView *image_view,
const GdkPixbuf *pixbuf,
@@ -1431,7 +1532,7 @@ gtk_image_view_set_pixbuf (GtkImageView *image_view,
/**
* gtk_image_view_set_surface:
* @image_view: A #GtkImageView instance
- * @surface:(nullable): A #cairo_surface_t of type #CAIRO_SURFACE_TYPE_IMAGE, or
+ * @surface: (nullable): A #cairo_surface_t of type #CAIRO_SURFACE_TYPE_IMAGE, or
* #NULL to unset any internal image data. In case this is #NULL, the scale will
* be reset to 1.0.
*/
@@ -1476,6 +1577,16 @@ gtk_image_view_set_surface (GtkImageView *image_view,
gtk_widget_queue_resize ((GtkWidget *)image_view);
}
+/**
+ * gtk_image_view_set_animation:
+ * @image_view: A #GtkImageView instance
+ * @animation: The #GdkAnimation to use
+ * @scale_factor: The scale factor of the animation. This will
+ * be interpreted as "the given animation is supposed to be used
+ * with the given scale factor", i.e. if the animation's scale
+ * factor is 2, and the screen's scale factor is also 2, the
+ * animation won't be scaled up.
+ */
void
gtk_image_view_set_animation (GtkImageView *image_view,
GdkPixbufAnimation *animation,
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