mirror of
https://gitlab.gnome.org/GNOME/gtk.git
synced 2024-11-10 02:40:11 +00:00
322 lines
8.6 KiB
C
322 lines
8.6 KiB
C
#include <unistd.h>
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#include <gtk/gtk.h>
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static GdkPaintable *
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get_image_paintable (GtkImage *image,
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int *out_size)
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{
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GtkIconTheme *icon_theme;
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const char *icon_name;
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int width = 48;
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GdkPaintable *paintable;
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GtkIconInfo *icon_info;
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switch (gtk_image_get_storage_type (image))
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{
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case GTK_IMAGE_PAINTABLE:
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paintable = gtk_image_get_paintable (image);
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*out_size = gdk_paintable_get_intrinsic_width (paintable);
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return g_object_ref (paintable);
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case GTK_IMAGE_ICON_NAME:
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icon_name = gtk_image_get_icon_name (image);
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icon_theme = gtk_icon_theme_get_for_display (gtk_widget_get_display (GTK_WIDGET (image)));
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*out_size = width;
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icon_info = gtk_icon_theme_lookup_icon (icon_theme, icon_name, width, GTK_ICON_LOOKUP_GENERIC_FALLBACK);
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paintable = gtk_icon_info_load_icon (icon_info, NULL);
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g_object_unref (icon_info);
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return paintable;
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default:
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g_warning ("Image storage type %d not handled",
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gtk_image_get_storage_type (image));
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return NULL;
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}
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}
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enum {
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TOP_LEFT,
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CENTER,
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BOTTOM_RIGHT
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};
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void
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image_drag_data_get (GtkWidget *widget,
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GdkDrag *drag,
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GtkSelectionData *selection_data,
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gpointer data)
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{
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GdkPaintable *paintable;
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const gchar *name;
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int size;
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if (gtk_selection_data_targets_include_image (selection_data, TRUE))
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{
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paintable = get_image_paintable (GTK_IMAGE (data), &size);
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if (GDK_IS_TEXTURE (paintable))
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gtk_selection_data_set_texture (selection_data, GDK_TEXTURE (paintable));
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if (paintable)
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g_object_unref (paintable);
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}
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else if (gtk_selection_data_targets_include_text (selection_data))
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{
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if (gtk_image_get_storage_type (GTK_IMAGE (data)) == GTK_IMAGE_ICON_NAME)
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name = gtk_image_get_icon_name (GTK_IMAGE (data));
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else
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name = "Boo!";
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gtk_selection_data_set_text (selection_data, name, -1);
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}
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else
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{
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g_assert_not_reached ();
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}
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}
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static void
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got_texture (GObject *source,
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GAsyncResult *result,
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gpointer data)
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{
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GdkDrop *drop = GDK_DROP (source);
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GtkWidget *image = data;
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const GValue *value;
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GError *error = NULL;
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value = gdk_drop_read_value_finish (drop, result, &error);
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if (value)
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{
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GdkTexture *texture = g_value_get_object (value);
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gtk_image_set_from_paintable (GTK_IMAGE (image), GDK_PAINTABLE (texture));
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gdk_drop_finish (drop, GDK_ACTION_COPY);
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}
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else
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{
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g_print ("Failed to get data: %s\n", error->message);
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g_error_free (error);
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gdk_drop_finish (drop, 0);
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}
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}
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static gboolean
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image_drag_drop (GtkDropTarget *dest,
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int x,
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int y,
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gpointer data)
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{
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GdkDrop *drop = gtk_drop_target_get_drop (dest);
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if (gdk_drop_has_value (drop, GDK_TYPE_TEXTURE))
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{
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gdk_drop_read_value_async (drop, GDK_TYPE_TEXTURE, G_PRIORITY_DEFAULT, NULL, got_texture, data);
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return TRUE;
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}
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return FALSE;
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}
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static void
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update_source_icon (GtkDragSource *source,
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const char *icon_name,
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int hotspot)
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{
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GdkPaintable *paintable;
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int hot_x, hot_y;
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int size = 48;
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paintable = gtk_icon_theme_load_icon (gtk_icon_theme_get_default (),
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icon_name, size, 0, NULL);
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switch (hotspot)
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{
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default:
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case TOP_LEFT:
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hot_x = 0;
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hot_y = 0;
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break;
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case CENTER:
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hot_x = size / 2;
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hot_y = size / 2;
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break;
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case BOTTOM_RIGHT:
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hot_x = size;
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hot_y = size;
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break;
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}
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gtk_drag_source_set_icon (source, paintable, hot_x, hot_y);
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g_object_unref (paintable);
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}
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static GBytes *
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get_data (const char *mimetype,
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gpointer data)
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{
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GtkWidget *image = data;
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GdkContentFormats *formats;
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gboolean want_text;
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formats = gdk_content_formats_new (NULL, 0);
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formats = gtk_content_formats_add_text_targets (formats);
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want_text = gdk_content_formats_contain_mime_type (formats, mimetype);
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gdk_content_formats_unref (formats);
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g_print ("get data called for %s\n", mimetype);
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if (want_text)
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{
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const char *text = gtk_image_get_icon_name (GTK_IMAGE (image));
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return g_bytes_new (text, strlen (text) + 1);
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}
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else if (strcmp (mimetype, "image/png") == 0)
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{
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int size;
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GdkPaintable *paintable = get_image_paintable (GTK_IMAGE (image), &size);
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if (GDK_IS_TEXTURE (paintable))
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{
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char *name = g_strdup ("drag-data-XXXXXX");
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int fd;
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char *data;
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gsize size;
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// FIXME: this is horrible
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fd = g_mkstemp (name);
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close (fd);
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gdk_texture_save_to_png (GDK_TEXTURE (paintable), name);
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g_file_get_contents (name, &data, &size, NULL);
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g_free (name);
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return g_bytes_new_take (data, size);
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}
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g_clear_object (&paintable);
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}
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return NULL;
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}
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static void
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drag_begin (GtkDragSource *source)
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{
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g_print ("drag begin\n");
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}
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static void
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drag_end (GtkDragSource *source)
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{
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g_print ("drag end\n");
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}
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static gboolean
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drag_failed (GtkDragSource *source, GdkDragCancelReason reason)
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{
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g_print ("drag failed: %d\n", reason);
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return FALSE;
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}
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GtkWidget *
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make_image (const gchar *icon_name, int hotspot)
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{
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GtkWidget *image;
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GtkDragSource *source;
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GtkDropTarget *dest;
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GdkContentFormats *formats;
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GdkContentProvider *content;
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image = gtk_image_new_from_icon_name (icon_name);
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gtk_image_set_icon_size (GTK_IMAGE (image), GTK_ICON_SIZE_LARGE);
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formats = gdk_content_formats_new (NULL, 0);
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formats = gtk_content_formats_add_image_targets (formats, FALSE);
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formats = gtk_content_formats_add_text_targets (formats);
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content = gdk_content_provider_new_with_formats (formats, get_data, image);
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source = gtk_drag_source_new (content, GDK_ACTION_COPY);
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g_object_unref (content);
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update_source_icon (source, icon_name, hotspot);
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g_signal_connect (source, "drag-begin", G_CALLBACK (drag_begin), NULL);
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g_signal_connect (source, "drag-end", G_CALLBACK (drag_end), NULL);
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g_signal_connect (source, "drag-failed", G_CALLBACK (drag_failed), NULL);
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gtk_drag_source_attach (source, image, GDK_BUTTON1_MASK);
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dest = gtk_drop_target_new (GTK_DEST_DEFAULT_MOTION | GTK_DEST_DEFAULT_HIGHLIGHT, formats, GDK_ACTION_COPY);
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g_signal_connect (dest, "drag-drop", G_CALLBACK (image_drag_drop), image);
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gtk_drop_target_attach (dest, image);
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gdk_content_formats_unref (formats);
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return image;
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}
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static void
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spinner_drag_begin (GtkDragSource *source,
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GtkWidget *widget)
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{
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GdkPaintable *paintable;
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paintable = gtk_widget_paintable_new (widget);
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gtk_drag_source_set_icon (source, paintable, 0, 0);
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g_object_unref (paintable);
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}
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static GtkWidget *
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make_spinner (void)
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{
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GtkWidget *spinner;
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GtkDragSource *source;
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GdkContentProvider *content;
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GValue value = G_VALUE_INIT;
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spinner = gtk_spinner_new ();
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gtk_spinner_start (GTK_SPINNER (spinner));
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g_value_init (&value, G_TYPE_STRING);
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g_value_set_string (&value, "ACTIVE");
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content = gdk_content_provider_new_for_value (&value);
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source = gtk_drag_source_new (content, GDK_ACTION_COPY);
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g_signal_connect (source, "drag-begin", G_CALLBACK (spinner_drag_begin), spinner);
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gtk_drag_source_attach (source, spinner, GDK_BUTTON1_MASK);
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g_object_unref (content);
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g_value_unset (&value);
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return spinner;
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}
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int
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main (int argc, char *Argv[])
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{
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GtkWidget *window;
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GtkWidget *grid;
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GtkWidget *entry;
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gtk_init ();
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window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
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gtk_window_set_title (GTK_WINDOW (window), "Drag And Drop");
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gtk_window_set_resizable (GTK_WINDOW (window), FALSE);
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grid = gtk_grid_new ();
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g_object_set (grid,
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"margin", 20,
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"row-spacing", 20,
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"column-spacing", 20,
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NULL);
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gtk_container_add (GTK_CONTAINER (window), grid);
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gtk_grid_attach (GTK_GRID (grid), make_image ("dialog-warning", TOP_LEFT), 0, 0, 1, 1);
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gtk_grid_attach (GTK_GRID (grid), make_image ("process-stop", BOTTOM_RIGHT), 1, 0, 1, 1);
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entry = gtk_entry_new ();
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gtk_grid_attach (GTK_GRID (grid), entry, 0, 1, 2, 1);
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gtk_grid_attach (GTK_GRID (grid), make_spinner (), 0, 2, 1, 1);
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gtk_grid_attach (GTK_GRID (grid), make_image ("weather-clear", CENTER), 1, 2, 1, 1);
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gtk_grid_attach (GTK_GRID (grid), make_image ("dialog-question", TOP_LEFT), 0, 3, 1, 1);
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gtk_grid_attach (GTK_GRID (grid), make_image ("dialog-information", CENTER), 1, 3, 1, 1);
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gtk_widget_show (window);
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gtk_main ();
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return 0;
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}
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