#include <gtk/gtk.h>
static GdkPixbuf *
get_image_pixbuf (GtkImage *image)
{
const gchar *icon_name;
GtkIconSize size;
GtkIconTheme *icon_theme;
int width;
switch (gtk_image_get_storage_type (image))
{
case GTK_IMAGE_PIXBUF:
return g_object_ref (gtk_image_get_pixbuf (image));
case GTK_IMAGE_ICON_NAME:
gtk_image_get_icon_name (image, &icon_name, &size);
icon_theme = gtk_icon_theme_get_for_screen (gtk_widget_get_screen (GTK_WIDGET (image)));
gtk_icon_size_lookup (size, &width, NULL);
return gtk_icon_theme_load_icon (icon_theme,
icon_name,
width,
GTK_ICON_LOOKUP_GENERIC_FALLBACK,
NULL);
default:
g_warning ("Image storage type %d not handled",
gtk_image_get_storage_type (image));
return NULL;
}
}
enum {
TARGET_IMAGE,
TARGET_TEXT
};
enum {
TOP_LEFT,
CENTER,
BOTTOM_RIGHT
};
static void
image_drag_begin (GtkWidget *widget,
GdkDragContext *context,
gpointer data)
{
GdkPixbuf *pixbuf;
gint hotspot;
gint hot_x, hot_y;
pixbuf = get_image_pixbuf (GTK_IMAGE (data));
hotspot = GPOINTER_TO_INT (g_object_get_data (G_OBJECT (data), "hotspot"));
switch (hotspot)
{
default:
case TOP_LEFT:
hot_x = 0;
hot_y = 0;
break;
case CENTER:
hot_x = gdk_pixbuf_get_width (pixbuf) / 2;
hot_y = gdk_pixbuf_get_height (pixbuf) / 2;
break;
case BOTTOM_RIGHT:
hot_x = gdk_pixbuf_get_width (pixbuf);
hot_y = gdk_pixbuf_get_height (pixbuf);
break;
}
gtk_drag_set_icon_pixbuf (context, pixbuf, hot_x, hot_y);
g_object_unref (pixbuf);
}
static void
window_destroyed (GtkWidget *window, gpointer data)
{
GtkWidget *widget = data;
g_print ("drag widget destroyed\n");
g_object_unref (window);
g_object_set_data (G_OBJECT (widget), "drag window", NULL);
}
static void
window_drag_end (GtkWidget *ebox, GdkDragContext *context, gpointer data)
{
GtkWidget *window = data;
gtk_widget_destroy (window);
g_signal_handlers_disconnect_by_func (ebox, window_drag_end, data);
}
static void
window_drag_begin (GtkWidget *widget,
GdkDragContext *context,
gpointer data)
{
GdkPixbuf *pixbuf;
GtkWidget *window;
GtkWidget *image;
int hotspot;
hotspot = GPOINTER_TO_INT (g_object_get_data (G_OBJECT (data), "hotspot"));
window = g_object_get_data (G_OBJECT (widget), "drag window");
if (window == NULL)
{
window = gtk_window_new (GTK_WINDOW_POPUP);
g_print ("creating new drag widget\n");
pixbuf = get_image_pixbuf (GTK_IMAGE (data));
image = gtk_image_new_from_pixbuf (pixbuf);
g_object_unref (pixbuf);
gtk_widget_show (image);
gtk_container_add (GTK_CONTAINER (window), image);
g_object_ref (window);
g_object_set_data (G_OBJECT (widget), "drag window", window);
g_signal_connect (window, "destroy", G_CALLBACK (window_destroyed), widget);
}
else
g_print ("reusing drag widget\n");
gtk_drag_set_icon_widget (context, window, 0, 0);
if (hotspot == CENTER)
g_signal_connect (widget, "drag-end", G_CALLBACK (window_drag_end), window);
}
static void
update_source_target_list (GtkWidget *ebox, GtkWidget *image)
{
GtkTargetList *target_list;
target_list = gtk_target_list_new (NULL, 0);
gtk_target_list_add_image_targets (target_list, TARGET_IMAGE, FALSE);
if (gtk_image_get_storage_type (GTK_IMAGE (image)) == GTK_IMAGE_ICON_NAME)
gtk_target_list_add_text_targets (target_list, TARGET_TEXT);
gtk_drag_source_set_target_list (ebox, target_list);
gtk_target_list_unref (target_list);
}
static void
update_dest_target_list (GtkWidget *ebox)
{
GtkTargetList *target_list;
target_list = gtk_target_list_new (NULL, 0);
gtk_target_list_add_image_targets (target_list, TARGET_IMAGE, FALSE);
gtk_target_list_add_text_targets (target_list, TARGET_TEXT);
gtk_drag_dest_set_target_list (ebox, target_list);
gtk_target_list_unref (target_list);
}
void
image_drag_data_get (GtkWidget *widget,
GdkDragContext *context,
GtkSelectionData *selection_data,
guint info,
guint time,
gpointer data)
{
GdkPixbuf *pixbuf;
const gchar *name;
switch (info)
{
case TARGET_IMAGE:
pixbuf = get_image_pixbuf (GTK_IMAGE (data));
gtk_selection_data_set_pixbuf (selection_data, pixbuf);
g_object_unref (pixbuf);
break;
case TARGET_TEXT:
if (gtk_image_get_storage_type (GTK_IMAGE (data)) == GTK_IMAGE_ICON_NAME)
gtk_image_get_icon_name (GTK_IMAGE (data), &name, NULL);
else
name = "Boo!";
gtk_selection_data_set_text (selection_data, name, -1);
break;
default:
g_assert_not_reached ();
}
}
static void
image_drag_data_received (GtkWidget *widget,
GdkDragContext *context,
gint x,
gint y,
GtkSelectionData *selection_data,
guint info,
guint32 time,
gpointer data)
{
GdkPixbuf *pixbuf;
gchar *text;
if (gtk_selection_data_get_length (selection_data) == 0)
return;
switch (info)
{
case TARGET_IMAGE:
pixbuf = gtk_selection_data_get_pixbuf (selection_data);
gtk_image_set_from_pixbuf (GTK_IMAGE (data), pixbuf);
g_object_unref (pixbuf);
break;
case TARGET_TEXT:
text = (gchar *)gtk_selection_data_get_text (selection_data);
gtk_image_set_from_icon_name (GTK_IMAGE (data), text, GTK_ICON_SIZE_DIALOG);
g_free (text);
break;
default:
g_assert_not_reached ();
}
}
GtkWidget *
make_image (const gchar *icon_name, int hotspot)
{
GtkWidget *image, *ebox;
image = gtk_image_new_from_icon_name (icon_name, GTK_ICON_SIZE_DIALOG);
ebox = gtk_event_box_new ();
gtk_drag_source_set (ebox, GDK_BUTTON1_MASK, NULL, 0, GDK_ACTION_COPY);
update_source_target_list (ebox, image);
g_object_set_data (G_OBJECT (image), "hotspot", GINT_TO_POINTER (hotspot));
g_signal_connect (ebox, "drag-begin", G_CALLBACK (image_drag_begin), image);
g_signal_connect (ebox, "drag-data-get", G_CALLBACK (image_drag_data_get), image);
gtk_drag_dest_set (ebox, GTK_DEST_DEFAULT_ALL, NULL, 0, GDK_ACTION_COPY);
g_signal_connect (ebox, "drag-data-received", G_CALLBACK (image_drag_data_received), image);
update_dest_target_list (ebox);
gtk_container_add (GTK_CONTAINER (ebox), image);
return ebox;
}
GtkWidget *
make_image2 (const gchar *icon_name, int hotspot)
{
GtkWidget *image, *ebox;
image = gtk_image_new_from_icon_name (icon_name, GTK_ICON_SIZE_DIALOG);
ebox = gtk_event_box_new ();
gtk_drag_source_set (ebox, GDK_BUTTON1_MASK, NULL, 0, GDK_ACTION_COPY);
update_source_target_list (ebox, image);
g_object_set_data (G_OBJECT (image), "hotspot", GINT_TO_POINTER (hotspot));
g_signal_connect (ebox, "drag-begin", G_CALLBACK (window_drag_begin), image);
g_signal_connect (ebox, "drag-data-get", G_CALLBACK (image_drag_data_get), image);
gtk_drag_dest_set (ebox, GTK_DEST_DEFAULT_ALL, NULL, 0, GDK_ACTION_COPY);
g_signal_connect (ebox, "drag-data-received", G_CALLBACK (image_drag_data_received), image);
update_dest_target_list (ebox);
gtk_container_add (GTK_CONTAINER (ebox), image);
return ebox;
}
static void
spinner_drag_begin (GtkWidget *widget,
GdkDragContext *context,
gpointer data)
{
GtkWidget *spinner;
g_print ("GtkWidget::drag-begin\n");
spinner = g_object_new (GTK_TYPE_SPINNER,
"visible", TRUE,
"active", TRUE,
NULL);
gtk_drag_set_icon_widget (context, spinner, 0, 0);
g_object_set_data (G_OBJECT (context), "spinner", spinner);
}
static void
spinner_drag_end (GtkWidget *widget,
GdkDragContext *context,
gpointer data)
{
GtkWidget *spinner;
g_print ("GtkWidget::drag-end\n");
spinner = g_object_get_data (G_OBJECT (context), "spinner");
gtk_widget_destroy (spinner);
}
static gboolean
spinner_drag_failed (GtkWidget *widget,
GdkDragContext *context,
GtkDragResult result,
gpointer data)
{
GTypeClass *class;
GEnumValue *value;
class = g_type_class_ref (GTK_TYPE_DRAG_RESULT);
value = g_enum_get_value (G_ENUM_CLASS (class), result);
g_print ("GtkWidget::drag-failed %s\n", value->value_nick);
g_type_class_unref (class);
return FALSE;
}
void
spinner_drag_data_get (GtkWidget *widget,
GdkDragContext *context,
GtkSelectionData *selection_data,
guint info,
guint time,
gpointer data)
{
g_print ("GtkWidget::drag-data-get\n");
gtk_selection_data_set_text (selection_data, "ACTIVE", -1);
}
static GtkWidget *
make_spinner (void)
{
GtkWidget *spinner, *ebox;
spinner = gtk_spinner_new ();
gtk_spinner_start (GTK_SPINNER (spinner));
ebox = gtk_event_box_new ();
gtk_drag_source_set (ebox, GDK_BUTTON1_MASK, NULL, 0, GDK_ACTION_COPY);
gtk_drag_source_add_text_targets (ebox);
g_signal_connect (ebox, "drag-begin", G_CALLBACK (spinner_drag_begin), spinner);
g_signal_connect (ebox, "drag-end", G_CALLBACK (spinner_drag_end), spinner);
g_signal_connect (ebox, "drag-failed", G_CALLBACK (spinner_drag_failed), spinner);
g_signal_connect (ebox, "drag-data-get", G_CALLBACK (spinner_drag_data_get), spinner);
gtk_container_add (GTK_CONTAINER (ebox), spinner);
return ebox;
}
int
main (int argc, char *Argv[])
{
GtkWidget *window;
GtkWidget *grid;
GtkWidget *entry;
gtk_init (NULL, NULL);
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_title (GTK_WINDOW (window), "Drag And Drop");
gtk_window_set_resizable (GTK_WINDOW (window), FALSE);
grid = gtk_grid_new ();
g_object_set (grid,
"margin", 20,
"row-spacing", 20,
"column-spacing", 20,
NULL);
gtk_container_add (GTK_CONTAINER (window), grid);
gtk_grid_attach (GTK_GRID (grid), make_image ("dialog-warning", TOP_LEFT), 0, 0, 1, 1);
gtk_grid_attach (GTK_GRID (grid), make_image ("process-stop", BOTTOM_RIGHT), 1, 0, 1, 1);
entry = gtk_entry_new ();
gtk_grid_attach (GTK_GRID (grid), entry, 0, 1, 2, 1);
gtk_grid_attach (GTK_GRID (grid), make_spinner (), 0, 2, 1, 1);
gtk_grid_attach (GTK_GRID (grid), make_image ("weather-clear", CENTER), 1, 2, 1, 1);
gtk_grid_attach (GTK_GRID (grid), make_image2 ("dialog-question", TOP_LEFT), 0, 3, 1, 1);
gtk_grid_attach (GTK_GRID (grid), make_image2 ("dialog-information", CENTER), 1, 3, 1, 1);
gtk_widget_show_all (window);
gtk_main ();
return 0;
}