New, simple dropdown button widget based on the thing that Damon did

in `e-meeting-time-sel.c'.

svn path=/trunk/; revision=7851

1 files changed, 218 insertions, 0 deletions

diff --git a/widgets/misc/e-dropdown-button.c b/widgets/misc/e-dropdown-button.c
new file mode 100644
index 0000000000..b40d31733a
--- /dev/null
+++ b/widgets/misc/e-dropdown-button.c
@@ -0,0 +1,218 @@
+/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
+/* e-dropdown-menu.c
+ *
+ * Copyright (C) 2001 Ximian, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Authors:
+ *   Ettore Perazzoli <ettore@ximian.com>
+ *   Damon Chaplin <damon@ximian.com> 
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+
+#include <gtk/gtk.h>
+#include <gal/util/e-util.h>
+
+#include "e-dropdown-button.h"
+
+
+struct _EDropdownButtonPrivate {
+	GtkAccelGroup *accel_group;
+	GtkWidget *menu;
+};
+
+#define PARENT_TYPE gtk_button_get_type ()
+static GtkButtonClass *parent_class = NULL;
+
+
+/* Callback to position the pop-up menu.  */
+
+static void
+menu_position_cb (GtkMenu *menu,
+		  int *x,
+		  int *y,
+		  void *data)
+{
+	EDropdownButton *dropdown_button;
+	EDropdownButtonPrivate *priv;
+	GtkRequisition menu_requisition;
+	int max_x, max_y;
+
+	dropdown_button = E_DROPDOWN_BUTTON (data);
+	priv = dropdown_button->priv;
+
+	/* Calculate our preferred position.  */
+	gdk_window_get_origin (GTK_WIDGET (dropdown_button)->window, x, y);
+	*y += GTK_WIDGET (dropdown_button)->allocation.height;
+
+	/* Now make sure we are on the screen.  */
+	gtk_widget_size_request (GTK_WIDGET (priv->menu), &menu_requisition);
+	max_x = MAX (0, gdk_screen_width () - menu_requisition.width);
+	max_y = MAX (0, gdk_screen_height () - menu_requisition.height);
+
+	*x = CLAMP (*x, 0, max_x);
+	*y = CLAMP (*y, 0, max_y);
+}
+
+
+/* GtkObject methods.  */
+
+static void
+impl_destroy (GtkObject *object)
+{
+	EDropdownButton *dropdown_button;
+	EDropdownButtonPrivate *priv;
+
+	dropdown_button = E_DROPDOWN_BUTTON (object);
+	priv = dropdown_button->priv;
+
+	gtk_accel_group_unref (priv->accel_group);
+	gtk_widget_destroy (priv->menu);
+
+	g_free (priv);
+}
+
+
+/* GtkButton methods.  */
+
+static void
+impl_clicked (GtkButton *button)
+{
+	EDropdownButton *dropdown_button;
+	EDropdownButtonPrivate *priv;
+
+	dropdown_button = E_DROPDOWN_BUTTON (button);
+	priv = dropdown_button->priv;
+
+	if (GTK_BUTTON_CLASS (parent_class)->clicked != NULL)
+		(* GTK_BUTTON_CLASS (parent_class)->clicked) (button);
+
+	gtk_menu_popup (GTK_MENU (priv->menu), NULL, NULL,
+			menu_position_cb, dropdown_button,
+			1, GDK_CURRENT_TIME);
+}
+
+
+static void
+class_init (EDropdownButtonClass *klass)
+{
+	GtkObjectClass *object_class;
+	GtkButtonClass *button_class;
+
+	object_class = GTK_OBJECT_CLASS (klass);
+	button_class = GTK_BUTTON_CLASS (klass);
+
+	object_class->destroy = impl_destroy;
+
+	button_class->clicked = impl_clicked;
+
+	parent_class = gtk_type_class (gtk_button_get_type ());
+}
+
+
+static void
+init (EDropdownButton *dropdown_button)
+{
+	EDropdownButtonPrivate *priv;
+
+	priv = g_new (EDropdownButtonPrivate, 1);
+	priv->accel_group = gtk_accel_group_new ();
+	priv->menu        = NULL;
+
+	dropdown_button->priv = priv;
+}
+
+
+void
+e_dropdown_button_construct (EDropdownButton *dropdown_button,
+			     const char *label_text,
+			     GtkMenu *menu,
+			     GnomeUIInfo *ui_info,
+			     void *data)
+{
+	EDropdownButtonPrivate *priv;
+	GtkWidget *hbox;
+	GtkWidget *arrow;
+	GtkWidget *label;
+	unsigned int accel_key;
+
+	g_return_if_fail (dropdown_button != NULL);
+	g_return_if_fail (E_IS_DROPDOWN_BUTTON (dropdown_button));
+	g_return_if_fail (label_text != NULL);
+	g_return_if_fail (menu != NULL);
+	g_return_if_fail (GTK_IS_MENU (menu));
+	g_return_if_fail (ui_info != NULL);
+
+	priv = dropdown_button->priv;
+
+	hbox = gtk_hbox_new (FALSE, 2);
+	gtk_container_add (GTK_CONTAINER (dropdown_button), hbox);
+	gtk_widget_show (hbox);
+
+	label = gtk_label_new ("");
+	accel_key = gtk_label_parse_uline (GTK_LABEL (label), label_text);
+	gtk_box_pack_start (GTK_BOX (hbox), label, TRUE, TRUE, 0);
+	gtk_widget_show (label);
+	gtk_widget_add_accelerator (GTK_WIDGET (dropdown_button), "clicked",
+				    priv->accel_group, accel_key, GDK_MOD1_MASK, 0);
+
+	arrow = gtk_arrow_new (GTK_ARROW_DOWN, GTK_SHADOW_OUT);
+	gtk_box_pack_start (GTK_BOX (hbox), arrow, FALSE, FALSE, 2);
+	gtk_widget_show (arrow);
+
+	priv->menu = GTK_WIDGET (menu);
+	gnome_app_fill_menu_with_data (GTK_MENU_SHELL (priv->menu), ui_info,
+				       priv->accel_group, TRUE, 0, data);
+}
+
+/**
+ * e_dropdown_button_new:
+ * @label_text: 
+ * @menu: 
+ * @ui_info: 
+ * @data: 
+ * 
+ * Create a new dropdown button.
+ * 
+ * Return value: 
+ **/
+GtkWidget *
+e_dropdown_button_new (const char *label_text,
+		       GtkMenu *menu,
+		       GnomeUIInfo *ui_info,
+		       void *data)
+{
+	GtkWidget *widget;
+
+	g_return_val_if_fail (label_text != NULL, NULL);
+	g_return_val_if_fail (menu != NULL, NULL);
+	g_return_val_if_fail (GTK_IS_MENU (menu), NULL);
+	g_return_val_if_fail (ui_info != NULL, NULL);
+
+	widget = gtk_type_new (e_dropdown_button_get_type ());
+
+	e_dropdown_button_construct (E_DROPDOWN_BUTTON (widget), label_text, menu, ui_info, data);
+
+	return widget;
+}
+
+
+E_MAKE_TYPE (e_dropdown_button, "EDropdownButton", EDropdownButton, class_init, init, PARENT_TYPE)