mirror of
https://gitlab.gnome.org/GNOME/gtk.git
synced 2024-11-10 10:50:10 +00:00
374 lines
11 KiB
C
374 lines
11 KiB
C
#include <gtk/gtk.h>
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static cairo_surface_t *
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get_image_surface (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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cairo_surface_t *surface;
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switch (gtk_image_get_storage_type (image))
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{
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case GTK_IMAGE_SURFACE:
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surface = gtk_image_get_surface (image);
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*out_size = cairo_image_surface_get_width (surface);
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return cairo_surface_reference (surface);
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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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return gtk_icon_theme_load_surface (icon_theme, icon_name, width, 1, NULL, GTK_ICON_LOOKUP_GENERIC_FALLBACK, NULL);
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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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static void
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image_drag_begin (GtkWidget *widget,
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GdkDragContext *context,
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gpointer data)
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{
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cairo_surface_t *surface;
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gint hotspot;
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gint hot_x, hot_y;
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gint size;
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surface = get_image_surface (GTK_IMAGE (data), &size);
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hotspot = GPOINTER_TO_INT (g_object_get_data (G_OBJECT (data), "hotspot"));
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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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cairo_surface_set_device_offset (surface, hot_x, hot_y);
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gtk_drag_set_icon_surface (context, surface);
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cairo_surface_destroy (surface);
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}
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static void
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drag_widget_destroyed (GtkWidget *image, gpointer data)
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{
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GtkWidget *widget = data;
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g_print ("drag widget destroyed\n");
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g_object_unref (image);
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g_object_set_data (G_OBJECT (widget), "drag widget", NULL);
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}
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static void
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window_drag_end (GtkWidget *widget, GdkDragContext *context, gpointer data)
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{
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GtkWidget *window = data;
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gtk_widget_destroy (window);
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g_signal_handlers_disconnect_by_func (widget, window_drag_end, data);
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}
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static void
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window_drag_begin (GtkWidget *widget,
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GdkDragContext *context,
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gpointer data)
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{
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cairo_surface_t *surface;
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GtkWidget *image;
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int hotspot;
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int size;
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hotspot = GPOINTER_TO_INT (g_object_get_data (G_OBJECT (data), "hotspot"));
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image = g_object_get_data (G_OBJECT (widget), "drag widget");
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if (image == NULL)
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{
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g_print ("creating new drag widget\n");
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surface = get_image_surface (GTK_IMAGE (data), &size);
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image = gtk_image_new_from_surface (surface);
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cairo_surface_destroy (surface);
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g_object_ref (image);
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g_object_set_data (G_OBJECT (widget), "drag widget", image);
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g_signal_connect (image, "destroy", G_CALLBACK (drag_widget_destroyed), widget);
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}
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else
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g_print ("reusing drag widget\n");
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gtk_drag_set_icon_widget (context, image, 0, 0);
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if (hotspot == CENTER)
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g_signal_connect (widget, "drag-end", G_CALLBACK (window_drag_end), image);
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}
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static void
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update_source_target_list (GtkWidget *image)
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{
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GdkContentFormats *target_list;
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target_list = gdk_content_formats_new (NULL, 0);
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target_list = gtk_content_formats_add_image_targets (target_list, FALSE);
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if (gtk_image_get_storage_type (GTK_IMAGE (image)) == GTK_IMAGE_ICON_NAME)
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target_list = gtk_content_formats_add_text_targets (target_list);
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gtk_drag_source_set_target_list (image, target_list);
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gdk_content_formats_unref (target_list);
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}
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static void
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update_dest_target_list (GtkWidget *image)
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{
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GdkContentFormats *target_list;
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target_list = gdk_content_formats_new (NULL, 0);
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target_list = gtk_content_formats_add_image_targets (target_list, FALSE);
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target_list = gtk_content_formats_add_text_targets (target_list);
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gtk_drag_dest_set_target_list (image, target_list);
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gdk_content_formats_unref (target_list);
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}
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void
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image_drag_data_get (GtkWidget *widget,
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GdkDragContext *context,
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GtkSelectionData *selection_data,
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guint time,
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gpointer data)
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{
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cairo_surface_t *surface;
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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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surface = get_image_surface (GTK_IMAGE (data), &size);
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gtk_selection_data_set_surface (selection_data, surface);
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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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image_drag_data_received (GtkWidget *widget,
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GdkDragContext *context,
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gint x,
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gint y,
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GtkSelectionData *selection_data,
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guint32 time,
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gpointer data)
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{
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cairo_surface_t *surface;
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gchar *text;
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if (gtk_selection_data_get_length (selection_data) == 0)
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return;
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if (gtk_selection_data_targets_include_image (selection_data, FALSE))
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{
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surface = gtk_selection_data_get_surface (selection_data);
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gtk_image_set_from_surface (GTK_IMAGE (data), surface);
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cairo_surface_destroy (surface);
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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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text = (gchar *)gtk_selection_data_get_text (selection_data);
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gtk_image_set_from_icon_name (GTK_IMAGE (data), text);
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g_free (text);
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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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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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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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gtk_drag_source_set (image, GDK_BUTTON1_MASK, NULL, GDK_ACTION_COPY);
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update_source_target_list (image);
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g_object_set_data (G_OBJECT (image), "hotspot", GINT_TO_POINTER (hotspot));
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g_signal_connect (image, "drag-begin", G_CALLBACK (image_drag_begin), image);
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g_signal_connect (image, "drag-data-get", G_CALLBACK (image_drag_data_get), image);
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gtk_drag_dest_set (image, GTK_DEST_DEFAULT_ALL, NULL, GDK_ACTION_COPY);
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g_signal_connect (image, "drag-data-received", G_CALLBACK (image_drag_data_received), image);
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update_dest_target_list (image);
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return image;
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}
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GtkWidget *
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make_image2 (const gchar *icon_name, int hotspot)
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{
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GtkWidget *image;
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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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gtk_drag_source_set (image, GDK_BUTTON1_MASK, NULL, GDK_ACTION_COPY);
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update_source_target_list (image);
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g_object_set_data (G_OBJECT (image), "hotspot", GINT_TO_POINTER (hotspot));
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g_signal_connect (image, "drag-begin", G_CALLBACK (window_drag_begin), image);
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g_signal_connect (image, "drag-data-get", G_CALLBACK (image_drag_data_get), image);
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gtk_drag_dest_set (image, GTK_DEST_DEFAULT_ALL, NULL, GDK_ACTION_COPY);
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g_signal_connect (image, "drag-data-received", G_CALLBACK (image_drag_data_received), image);
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update_dest_target_list (image);
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return image;
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}
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static void
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spinner_drag_begin (GtkWidget *widget,
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GdkDragContext *context,
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gpointer data)
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{
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GtkWidget *spinner;
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g_print ("GtkWidget::drag-begin\n");
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spinner = g_object_new (GTK_TYPE_SPINNER,
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"visible", TRUE,
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"active", TRUE,
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NULL);
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gtk_drag_set_icon_widget (context, spinner, 0, 0);
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g_object_set_data (G_OBJECT (context), "spinner", spinner);
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}
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static void
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spinner_drag_end (GtkWidget *widget,
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GdkDragContext *context,
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gpointer data)
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{
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GtkWidget *spinner;
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g_print ("GtkWidget::drag-end\n");
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spinner = g_object_get_data (G_OBJECT (context), "spinner");
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gtk_widget_destroy (spinner);
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}
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static gboolean
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spinner_drag_failed (GtkWidget *widget,
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GdkDragContext *context,
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GtkDragResult result,
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gpointer data)
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{
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GTypeClass *class;
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GEnumValue *value;
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class = g_type_class_ref (GTK_TYPE_DRAG_RESULT);
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value = g_enum_get_value (G_ENUM_CLASS (class), result);
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g_print ("GtkWidget::drag-failed %s\n", value->value_nick);
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g_type_class_unref (class);
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return FALSE;
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}
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void
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spinner_drag_data_get (GtkWidget *widget,
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GdkDragContext *context,
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GtkSelectionData *selection_data,
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guint time,
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gpointer data)
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{
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g_print ("GtkWidget::drag-data-get\n");
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gtk_selection_data_set_text (selection_data, "ACTIVE", -1);
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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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spinner = gtk_spinner_new ();
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gtk_spinner_start (GTK_SPINNER (spinner));
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gtk_drag_source_set (spinner, GDK_BUTTON1_MASK, NULL, GDK_ACTION_COPY);
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gtk_drag_source_add_text_targets (spinner);
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g_signal_connect (spinner, "drag-begin", G_CALLBACK (spinner_drag_begin), spinner);
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g_signal_connect (spinner, "drag-end", G_CALLBACK (spinner_drag_end), spinner);
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g_signal_connect (spinner, "drag-failed", G_CALLBACK (spinner_drag_failed), spinner);
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g_signal_connect (spinner, "drag-data-get", G_CALLBACK (spinner_drag_data_get), spinner);
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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_image2 ("dialog-question", TOP_LEFT), 0, 3, 1, 1);
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gtk_grid_attach (GTK_GRID (grid), make_image2 ("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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