[gtk+/gtk-3-22] Add a cleaned-up example for listbox DND
- From: Matthias Clasen <matthiasc src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gtk+/gtk-3-22] Add a cleaned-up example for listbox DND
- Date: Sun, 23 Apr 2017 14:40:38 +0000 (UTC)
commit d94f16562e954e694587ed0cb992efd0c6fdbca6
Author: Matthias Clasen <mclasen redhat com>
Date: Sun Apr 23 10:39:44 2017 -0400
Add a cleaned-up example for listbox DND
I want to refer to this as an example, so make it look nice.
examples/Makefile.am | 3 +-
examples/listbox-dnd.c | 155 ++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 157 insertions(+), 1 deletions(-)
---
diff --git a/examples/Makefile.am b/examples/Makefile.am
index 710d4a3..a455c03 100644
--- a/examples/Makefile.am
+++ b/examples/Makefile.am
@@ -28,7 +28,8 @@ noinst_PROGRAMS = \
grid-packing \
drawing \
builder \
- search-bar
+ search-bar \
+ listbox-dnd
EXTRA_DIST = builder.ui
diff --git a/examples/listbox-dnd.c b/examples/listbox-dnd.c
new file mode 100644
index 0000000..ab77209
--- /dev/null
+++ b/examples/listbox-dnd.c
@@ -0,0 +1,155 @@
+#include <gtk/gtk.h>
+
+static GtkTargetEntry entries[] = {
+ { "GTK_LIST_BOX_ROW", GTK_TARGET_SAME_APP, 0 }
+};
+
+static void
+drag_begin (GtkWidget *widget,
+ GdkDragContext *context,
+ gpointer data)
+{
+ GtkWidget *row;
+ GtkAllocation alloc;
+ cairo_surface_t *surface;
+ cairo_t *cr;
+ int x, y;
+
+ row = gtk_widget_get_ancestor (widget, GTK_TYPE_LIST_BOX_ROW);
+ gtk_widget_get_allocation (row, &alloc);
+ surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, alloc.width, alloc.height);
+ cr = cairo_create (surface);
+
+ gtk_style_context_add_class (gtk_widget_get_style_context (row), "drag-icon");
+ gtk_widget_draw (row, cr);
+ gtk_style_context_remove_class (gtk_widget_get_style_context (row), "drag-icon");
+
+ gtk_widget_translate_coordinates (widget, row, 0, 0, &x, &y);
+ cairo_surface_set_device_offset (surface, -x, -y);
+ gtk_drag_set_icon_surface (context, surface);
+
+ cairo_destroy (cr);
+ cairo_surface_destroy (surface);
+}
+
+void
+drag_data_get (GtkWidget *widget,
+ GdkDragContext *context,
+ GtkSelectionData *selection_data,
+ guint info,
+ guint time,
+ gpointer data)
+{
+ gtk_selection_data_set (selection_data,
+ gdk_atom_intern_static_string ("GTK_LIST_BOX_ROW"),
+ 32,
+ (const guchar *)&widget,
+ sizeof (gpointer));
+}
+
+static void
+drag_data_received (GtkWidget *widget,
+ GdkDragContext *context,
+ gint x,
+ gint y,
+ GtkSelectionData *selection_data,
+ guint info,
+ guint32 time,
+ gpointer data)
+{
+ GtkWidget *target;
+ GtkWidget *row;
+ GtkWidget *source;
+ int pos;
+
+ target = widget;
+
+ pos = gtk_list_box_row_get_index (GTK_LIST_BOX_ROW (target));
+ row = (gpointer)* (gpointer*)gtk_selection_data_get_data (selection_data);
+ source = gtk_widget_get_ancestor (row, GTK_TYPE_LIST_BOX_ROW);
+
+ if (source == target)
+ return;
+
+ g_object_ref (source);
+ gtk_container_remove (GTK_CONTAINER (gtk_widget_get_parent (source)), source);
+ gtk_list_box_insert (GTK_LIST_BOX (gtk_widget_get_parent (target)), source, pos);
+ g_object_unref (source);
+}
+
+static GtkWidget *
+create_row (const gchar *text)
+{
+ GtkWidget *row, *handle, *box, *label, *image;
+
+ row = gtk_list_box_row_new ();
+
+ box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 10);
+ g_object_set (box, "margin-start", 10, "margin-end", 10, NULL);
+ gtk_container_add (GTK_CONTAINER (row), box);
+
+ handle = gtk_event_box_new ();
+ image = gtk_image_new_from_icon_name ("open-menu-symbolic", 1);
+ gtk_container_add (GTK_CONTAINER (handle), image);
+ gtk_container_add (GTK_CONTAINER (box), handle);
+
+ label = gtk_label_new (text);
+ gtk_container_add_with_properties (GTK_CONTAINER (box), label, "expand", TRUE, NULL);
+
+ gtk_drag_source_set (handle, GDK_BUTTON1_MASK, entries, 1, GDK_ACTION_MOVE);
+ g_signal_connect (handle, "drag-begin", G_CALLBACK (drag_begin), NULL);
+ g_signal_connect (handle, "drag-data-get", G_CALLBACK (drag_data_get), NULL);
+
+ gtk_drag_dest_set (row, GTK_DEST_DEFAULT_ALL, entries, 1, GDK_ACTION_MOVE);
+ g_signal_connect (row, "drag-data-received", G_CALLBACK (drag_data_received), NULL);
+
+ return row;
+}
+
+static const char *css =
+ ".drag-icon { "
+ " background: white; "
+ " border: 1px solid black; "
+ "}";
+
+int
+main (int argc, char *argv[])
+{
+ GtkWidget *window, *list, *sw, *row;
+ gint i;
+ gchar *text;
+ GtkCssProvider *provider;
+
+ gtk_init (NULL, NULL);
+
+ provider = gtk_css_provider_new ();
+ gtk_css_provider_load_from_data (provider, css, -1, NULL);
+ gtk_style_context_add_provider_for_screen (gdk_screen_get_default (),
+ GTK_STYLE_PROVIDER (provider),
+ GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
+
+ window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+ gtk_window_set_default_size (GTK_WINDOW (window), -1, 300);
+
+ sw = gtk_scrolled_window_new (NULL, NULL);
+ gtk_widget_set_hexpand (sw, TRUE);
+ gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sw), GTK_POLICY_NEVER, GTK_POLICY_ALWAYS);
+ gtk_container_add (GTK_CONTAINER (window), sw);
+
+ list = gtk_list_box_new ();
+ gtk_list_box_set_selection_mode (GTK_LIST_BOX (list), GTK_SELECTION_NONE);
+ gtk_container_add (GTK_CONTAINER (sw), list);
+
+ for (i = 0; i < 20; i++)
+ {
+ text = g_strdup_printf ("Row %d", i);
+ row = create_row (text);
+ gtk_list_box_insert (GTK_LIST_BOX (list), row, -1);
+ }
+
+ gtk_widget_show_all (window);
+
+ gtk_main ();
+
+ return 0;
+}
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