toolpalette: Added dnd code to the gtk-demo
This commit is contained in:
Johannes Schmid
@ -13,6 +13,351 @@ static void load_stock_items (GtkToolPalette *palette);
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static void load_toggle_items (GtkToolPalette *palette);
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static void load_special_items (GtkToolPalette *palette);
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typedef struct _CanvasItem CanvasItem;
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struct _CanvasItem
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{
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GdkPixbuf *pixbuf;
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gdouble x, y;
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};
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static CanvasItem *drop_item = NULL;
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static GList *canvas_items = NULL;
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/********************************/
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/* ====== Canvas drawing ====== */
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/********************************/
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static CanvasItem*
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canvas_item_new (GtkWidget *widget,
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GtkToolButton *button,
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gdouble x,
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gdouble y)
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{
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CanvasItem *item = NULL;
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const gchar *stock_id;
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GdkPixbuf *pixbuf;
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stock_id = gtk_tool_button_get_stock_id (button);
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pixbuf = gtk_widget_render_icon (widget, stock_id, GTK_ICON_SIZE_DIALOG, NULL);
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if (pixbuf)
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{
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item = g_slice_new0 (CanvasItem);
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item->pixbuf = pixbuf;
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item->x = x;
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item->y = y;
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}
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return item;
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}
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static void
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canvas_item_free (CanvasItem *item)
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{
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g_object_unref (item->pixbuf);
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g_slice_free (CanvasItem, item);
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}
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static void
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canvas_item_draw (const CanvasItem *item,
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cairo_t *cr,
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gboolean preview)
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{
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gdouble cx = gdk_pixbuf_get_width (item->pixbuf);
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gdouble cy = gdk_pixbuf_get_height (item->pixbuf);
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gdk_cairo_set_source_pixbuf (cr,
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item->pixbuf,
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item->x - cx * 0.5,
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item->y - cy * 0.5);
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if (preview)
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cairo_paint_with_alpha (cr, 0.6);
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else
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cairo_paint (cr);
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}
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static gboolean
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canvas_expose_event (GtkWidget *widget,
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GdkEventExpose *event)
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{
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cairo_t *cr;
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GList *iter;
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cr = gdk_cairo_create (widget->window);
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gdk_cairo_region (cr, event->region);
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cairo_clip (cr);
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cairo_set_source_rgb (cr, 1, 1, 1);
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cairo_rectangle (cr, 0, 0, widget->allocation.width, widget->allocation.height);
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cairo_fill (cr);
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for (iter = canvas_items; iter; iter = iter->next)
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canvas_item_draw (iter->data, cr, FALSE);
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if (drop_item)
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canvas_item_draw (drop_item, cr, TRUE);
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cairo_destroy (cr);
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return TRUE;
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}
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/*****************************/
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/* ====== Palette DnD ====== */
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/*****************************/
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static void
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palette_drop_item (GtkToolItem *drag_item,
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GtkToolItemGroup *drop_group,
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gint x,
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gint y)
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{
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GtkWidget *drag_group = gtk_widget_get_parent (GTK_WIDGET (drag_item));
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GtkToolItem *drop_item = gtk_tool_item_group_get_drop_item (drop_group, x, y);
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gint drop_position = -1;
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if (drop_item)
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drop_position = gtk_tool_item_group_get_item_position (GTK_TOOL_ITEM_GROUP (drop_group), drop_item);
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if (GTK_TOOL_ITEM_GROUP (drag_group) != drop_group)
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{
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gboolean homogeneous, expand, fill, new_row;
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g_object_ref (drag_item);
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gtk_container_child_get (GTK_CONTAINER (drag_group), GTK_WIDGET (drag_item),
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"homogeneous", &homogeneous,
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"expand", &expand,
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"fill", &fill,
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"new-row", &new_row,
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NULL);
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gtk_container_remove (GTK_CONTAINER (drag_group), GTK_WIDGET (drag_item));
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gtk_tool_item_group_insert (GTK_TOOL_ITEM_GROUP (drop_group),
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drag_item, drop_position);
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gtk_container_child_set (GTK_CONTAINER (drop_group), GTK_WIDGET (drag_item),
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"homogeneous", homogeneous,
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"expand", expand,
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"fill", fill,
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"new-row", new_row,
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NULL);
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g_object_unref (drag_item);
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}
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else
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gtk_tool_item_group_set_item_position (GTK_TOOL_ITEM_GROUP (drop_group),
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drag_item, drop_position);
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}
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static void
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palette_drop_group (GtkToolPalette *palette,
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GtkWidget *drag_group,
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GtkWidget *drop_group)
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{
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gint drop_position = -1;
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if (drop_group)
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drop_position = gtk_tool_palette_get_group_position (palette, drop_group);
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gtk_tool_palette_set_group_position (palette, drag_group, drop_position);
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}
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static void
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palette_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,
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guint info G_GNUC_UNUSED,
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guint time G_GNUC_UNUSED,
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gpointer data G_GNUC_UNUSED)
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{
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GtkWidget *drag_palette = gtk_drag_get_source_widget (context);
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GtkWidget *drag_item = NULL, *drop_group = NULL;
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while (drag_palette && !GTK_IS_TOOL_PALETTE (drag_palette))
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drag_palette = gtk_widget_get_parent (drag_palette);
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if (drag_palette)
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{
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drag_item = gtk_tool_palette_get_drag_item (GTK_TOOL_PALETTE (drag_palette), selection);
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drop_group = gtk_tool_palette_get_drop_group (GTK_TOOL_PALETTE (widget), x, y);
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}
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if (GTK_IS_TOOL_ITEM_GROUP (drag_item))
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palette_drop_group (GTK_TOOL_PALETTE (drag_palette), drag_item, drop_group);
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else if (GTK_IS_TOOL_ITEM (drag_item) && drop_group)
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palette_drop_item (GTK_TOOL_ITEM (drag_item),
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GTK_TOOL_ITEM_GROUP (drop_group),
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x - GTK_WIDGET (drop_group)->allocation.x,
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y - GTK_WIDGET (drop_group)->allocation.y);
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}
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/********************************/
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/* ====== Passive Canvas ====== */
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/********************************/
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static void
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passive_canvas_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,
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guint info G_GNUC_UNUSED,
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guint time G_GNUC_UNUSED,
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gpointer data G_GNUC_UNUSED)
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{
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/* find the tool button, which is the source of this DnD operation */
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GtkWidget *palette = gtk_drag_get_source_widget (context);
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CanvasItem *canvas_item = NULL;
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GtkWidget *tool_item = NULL;
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while (palette && !GTK_IS_TOOL_PALETTE (palette))
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palette = gtk_widget_get_parent (palette);
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if (palette)
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tool_item = gtk_tool_palette_get_drag_item (GTK_TOOL_PALETTE (palette), selection);
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g_assert (NULL == drop_item);
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/* append a new canvas item when a tool button was found */
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if (GTK_IS_TOOL_ITEM (tool_item))
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canvas_item = canvas_item_new (widget, GTK_TOOL_BUTTON (tool_item), x, y);
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if (canvas_item)
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{
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canvas_items = g_list_append (canvas_items, canvas_item);
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gtk_widget_queue_draw (widget);
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}
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}
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/************************************/
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/* ====== Interactive Canvas ====== */
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/************************************/
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static gboolean
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interactive_canvas_drag_motion (GtkWidget *widget,
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GdkDragContext *context,
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gint x,
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gint y,
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guint time,
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gpointer data G_GNUC_UNUSED)
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{
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if (drop_item)
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{
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/* already have a drop indicator - just update position */
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drop_item->x = x;
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drop_item->y = y;
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gtk_widget_queue_draw (widget);
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gdk_drag_status (context, GDK_ACTION_COPY, time);
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}
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else
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{
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/* request DnD data for creating a drop indicator */
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GdkAtom target = gtk_drag_dest_find_target (widget, context, NULL);
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if (!target)
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return FALSE;
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gtk_drag_get_data (widget, context, target, time);
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}
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return TRUE;
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}
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static void
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interactive_canvas_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,
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guint info G_GNUC_UNUSED,
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guint time G_GNUC_UNUSED,
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gpointer data G_GNUC_UNUSED)
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{
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/* find the tool button, which is the source of this DnD operation */
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GtkWidget *palette = gtk_drag_get_source_widget (context);
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GtkWidget *tool_item = NULL;
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while (palette && !GTK_IS_TOOL_PALETTE (palette))
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palette = gtk_widget_get_parent (palette);
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if (palette)
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tool_item = gtk_tool_palette_get_drag_item (GTK_TOOL_PALETTE (palette), selection);
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/* create a drop indicator when a tool button was found */
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g_assert (NULL == drop_item);
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if (GTK_IS_TOOL_ITEM (tool_item))
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{
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drop_item = canvas_item_new (widget, GTK_TOOL_BUTTON (tool_item), x, y);
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gdk_drag_status (context, GDK_ACTION_COPY, time);
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gtk_widget_queue_draw (widget);
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}
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}
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static gboolean
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interactive_canvas_drag_drop (GtkWidget *widget,
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GdkDragContext *context G_GNUC_UNUSED,
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gint x,
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gint y,
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guint time,
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gpointer data G_GNUC_UNUSED)
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{
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if (drop_item)
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{
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/* turn the drop indicator into a real canvas item */
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drop_item->x = x;
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drop_item->y = y;
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canvas_items = g_list_append (canvas_items, drop_item);
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drop_item = NULL;
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/* signal the item was accepted and redraw */
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gtk_drag_finish (context, TRUE, FALSE, time);
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gtk_widget_queue_draw (widget);
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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 gboolean
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interactive_canvas_real_drag_leave (gpointer data)
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{
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if (drop_item)
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{
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GtkWidget *widget = GTK_WIDGET (data);
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canvas_item_free (drop_item);
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drop_item = NULL;
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gtk_widget_queue_draw (widget);
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}
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return FALSE;
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}
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static void
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interactive_canvas_drag_leave (GtkWidget *widget,
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GdkDragContext *context G_GNUC_UNUSED,
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guint time G_GNUC_UNUSED,
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gpointer data G_GNUC_UNUSED)
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{
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/* defer cleanup until a potential "drag-drop" signal was received */
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g_idle_add (interactive_canvas_real_drag_leave, widget);
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}
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static void on_combo_orientation_changed(GtkComboBox *combo_box, gpointer user_data)
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{
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GtkToolPalette *palette = GTK_TOOL_PALETTE (user_data);
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@ -56,6 +401,7 @@ GtkWidget *
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do_toolpalette (GtkWidget *do_widget)
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{
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GtkWidget *box = NULL;
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GtkWidget *hbox = NULL;
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GtkWidget *combo_orientation = NULL;
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GtkListStore *combo_orientation_model = NULL;
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GtkWidget *combo_style = NULL;
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@ -64,6 +410,9 @@ do_toolpalette (GtkWidget *do_widget)
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GtkTreeIter iter;
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GtkWidget *palette = NULL;
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GtkWidget *palette_scroller = NULL;
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GtkWidget *notebook = NULL;
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GtkWidget *contents = NULL;
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GtkWidget *contents_scroller = NULL;
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if (!window)
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{
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@ -129,6 +478,10 @@ do_toolpalette (GtkWidget *do_widget)
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&iter);
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gtk_box_pack_start (GTK_BOX (box), combo_style, FALSE, FALSE, 0);
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/* Add hbox */
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hbox = gtk_hbox_new (FALSE, 5);
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gtk_box_pack_start (GTK_BOX (box), hbox, TRUE, TRUE, 0);
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/* Add and fill the ToolPalette: */
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palette = gtk_tool_palette_new ();
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@ -142,7 +495,7 @@ do_toolpalette (GtkWidget *do_widget)
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gtk_container_set_border_width (GTK_CONTAINER (palette_scroller), 6);
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gtk_container_add (GTK_CONTAINER (palette_scroller), palette);
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gtk_container_add (GTK_CONTAINER (box), palette_scroller);
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gtk_container_add (GTK_CONTAINER (hbox), palette_scroller);
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gtk_widget_show_all (box);
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@ -154,6 +507,76 @@ do_toolpalette (GtkWidget *do_widget)
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/* Keep the widgets in sync: */
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on_combo_orientation_changed (GTK_COMBO_BOX (combo_orientation), palette);
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/* ===== notebook ===== */
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notebook = gtk_notebook_new ();
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gtk_container_set_border_width (GTK_CONTAINER (notebook), 6);
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gtk_box_pack_end (GTK_BOX(hbox), notebook, FALSE, FALSE, 0);
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/* ===== DnD for tool items ===== */
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g_signal_connect (palette, "drag-data-received",
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G_CALLBACK (palette_drag_data_received),
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NULL);
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gtk_tool_palette_add_drag_dest (GTK_TOOL_PALETTE (palette),
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palette, GTK_DEST_DEFAULT_ALL,
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GTK_TOOL_PALETTE_DRAG_ITEMS |
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GTK_TOOL_PALETTE_DRAG_GROUPS,
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GDK_ACTION_MOVE);
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/* ===== passive DnD dest ===== */
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contents = gtk_drawing_area_new ();
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gtk_widget_set_app_paintable (contents, TRUE);
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g_object_connect (contents,
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"signal::expose-event", canvas_expose_event, NULL,
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"signal::drag-data-received", passive_canvas_drag_data_received, NULL,
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NULL);
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gtk_tool_palette_add_drag_dest (GTK_TOOL_PALETTE (palette),
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contents, GTK_DEST_DEFAULT_ALL,
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GTK_TOOL_PALETTE_DRAG_ITEMS,
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GDK_ACTION_COPY);
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contents_scroller = gtk_scrolled_window_new (NULL, NULL);
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gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (contents_scroller),
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GTK_POLICY_AUTOMATIC, GTK_POLICY_ALWAYS);
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gtk_scrolled_window_add_with_viewport (GTK_SCROLLED_WINDOW (contents_scroller), contents);
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gtk_container_set_border_width (GTK_CONTAINER (contents_scroller), 6);
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gtk_notebook_append_page (GTK_NOTEBOOK (notebook), contents_scroller,
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gtk_label_new ("Passive DnD Mode"));
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/* ===== interactive DnD dest ===== */
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contents = gtk_drawing_area_new ();
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gtk_widget_set_app_paintable (contents, TRUE);
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g_object_connect (contents,
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"signal::expose-event", canvas_expose_event, NULL,
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"signal::drag-motion", interactive_canvas_drag_motion, NULL,
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"signal::drag-data-received", interactive_canvas_drag_data_received, NULL,
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"signal::drag-leave", interactive_canvas_drag_leave, NULL,
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"signal::drag-drop", interactive_canvas_drag_drop, NULL,
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NULL);
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gtk_tool_palette_add_drag_dest (GTK_TOOL_PALETTE (palette),
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contents, GTK_DEST_DEFAULT_HIGHLIGHT,
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GTK_TOOL_PALETTE_DRAG_ITEMS,
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GDK_ACTION_COPY);
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contents_scroller = gtk_scrolled_window_new (NULL, NULL);
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gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (contents_scroller),
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GTK_POLICY_AUTOMATIC, GTK_POLICY_ALWAYS);
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gtk_scrolled_window_add_with_viewport (GTK_SCROLLED_WINDOW (contents_scroller), contents);
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gtk_container_set_border_width (GTK_CONTAINER (contents_scroller), 6);
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gtk_notebook_append_page (GTK_NOTEBOOK (notebook), contents_scroller,
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gtk_label_new ("Interactive DnD Mode"));
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}
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if (!GTK_WIDGET_VISIBLE (window))
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