Exten the EphyLinkAction to attach a mouse-release-event handler which

2005-10-16  Philip Langdale  <philipl@mail.utexas.edu>

	* src/ephy-link-action.c:
	(proxy_button_release_event_cb), (get_event_widget),
	(ephy_link_action_connect_proxy), (ephy_link_action_disconnect_proxy),
	(ephy_link_action_class_init), (ephy_link_action_get_type):
	Exten the EphyLinkAction to attach a mouse-release-event handler
	which turns around and calls gtk_action_activate in response to a
	middle-click even on the proxy. This allows us to fully encapsulate
	the extra work needed to catch middle clicks.
	The GoHome action will automatically start working correctly now
	that it is getting activated in this case.

	* src/ephy-navigation-action.c:
	(activate_by_history_index), (activate_back_or_forward_menu_item_cb),
	(ephy_navigation_action_activate), (ephy_navigation_action_class_init):
	Fully enscapsulate 'activate' handling inside the action. This is more
	consistent because the menus are already handled internally. Also
	add support for middle-click on back/forward/up.

	* src/ephy-toolbar.c:
	(ephy_toolbar_set_window): Don't attach 'activate' signal handlers
	to the navigate actions because activation is now handled internally
	to the action.

	I intend to make a followup change that removes the separate actions
	for GoUp/Back/Forward in the menu and replace them with the main
	actions already used in the toolbar. This means the menu items will
	get middle-click support for free.

	* lib/ephy-gui.c: (ephy_gui_is_middle_click):
	Only consider an unmodified middle-click to be a middle-click.

1 files changed, 120 insertions, 1 deletions

diff --git a/src/ephy-link-action.c b/src/ephy-link-action.c
index 18af84759..5eca8a65b 100644
--- a/src/ephy-link-action.c
+++ b/src/ephy-link-action.c
@@ -1,5 +1,6 @@
 /*
  *  Copyright (C) 2004 Christian Persch
+ *  Copyright (C) 2005 Philip Langdale
  *
  *  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
@@ -23,6 +24,124 @@
 #include "ephy-link-action.h"
 #include "ephy-link.h"
 
+#include "ephy-debug.h"
+#include "ephy-gui.h"
+
+#include <gtk/gtkbutton.h>
+#include <gtk/gtkmenuitem.h>
+#include <gtk/gtkmenutoolbutton.h>
+
+static GObjectClass *parent_class = NULL;
+
+static gboolean
+proxy_button_release_event_cb (GtkWidget *widget,
+			       GdkEventButton *event,
+			       GtkAction *action)
+{
+	/**
+	 * We do not use ephy_gui_is_middle_click() here because
+	 * that also catches ctrl + left_click which already
+	 * triggers an activate event for all proxies.
+	 */
+	if (event->button == 2)
+	{
+		gtk_action_activate(action);
+	}
+
+	return FALSE;
+}
+
+static GtkWidget *
+get_event_widget (GtkWidget *proxy)
+{
+	GtkWidget *widget;
+
+	/**
+	 * Finding the interesting widget requires internal knowledge of
+	 * the widgets in question. This can't be helped, but by keeping
+	 * the sneaky code in one place, it can easily be updated.
+	 */
+	if (GTK_IS_MENU_ITEM (proxy))
+	{
+		/* Menu items already forward middle clicks */
+		widget = NULL;
+	}
+	else if (GTK_IS_MENU_TOOL_BUTTON (proxy))
+	{
+		/**
+		 * The menu tool button's button is the first child
+		 * of the child hbox.
+		 */
+		GtkContainer *container =
+			GTK_CONTAINER (gtk_bin_get_child (GTK_BIN (proxy)));
+		widget = GTK_WIDGET (gtk_container_get_children (container)->data);
+	}
+	else if (GTK_IS_TOOL_BUTTON (proxy))
+	{
+		/* The tool button's button is the direct child */
+		widget = gtk_bin_get_child (GTK_BIN (proxy));
+	}
+	else if (GTK_IS_BUTTON (proxy))
+	{
+		widget = proxy;
+	}
+	else
+	{
+		/* Don't touch anything we don't know about */
+		widget = NULL;
+	}
+
+	return widget;
+}
+
+static void
+ephy_link_action_connect_proxy (GtkAction *action, GtkWidget *proxy)
+{
+	GtkWidget *widget;
+
+	LOG ("Connect link action proxy");
+
+	widget = get_event_widget(proxy);
+	if (widget)
+	{
+		g_signal_connect (widget, "button-release-event",
+				  G_CALLBACK (proxy_button_release_event_cb),
+				  action);
+	}
+
+	GTK_ACTION_CLASS (parent_class)->connect_proxy (action, proxy);
+}
+
+static void
+ephy_link_action_disconnect_proxy (GtkAction *action, GtkWidget *proxy)
+{
+	GtkWidget *widget;
+
+	LOG ("Disconnect link action proxy");
+
+	widget = get_event_widget(proxy);
+	if (widget)
+	{
+		g_signal_handlers_disconnect_by_func (widget,
+						      G_CALLBACK (proxy_button_release_event_cb),
+						      action);
+	}
+
+	GTK_ACTION_CLASS (parent_class)->disconnect_proxy (action, proxy);
+}
+
+static void
+ephy_link_action_class_init (EphyLinkActionClass *class)
+{
+	GtkActionClass *action_class = GTK_ACTION_CLASS (class);
+
+	parent_class = g_type_class_peek_parent (class);
+
+	action_class->connect_proxy = ephy_link_action_connect_proxy;
+	action_class->disconnect_proxy = ephy_link_action_disconnect_proxy;
+}
+
+
 GType
 ephy_link_action_get_type (void)
 {
@@ -35,7 +154,7 @@ ephy_link_action_get_type (void)
 			sizeof (EphyLinkActionClass),
 			NULL, /* base_init */
 			NULL, /* base_finalize */
-			NULL, /* class_init */
+			(GClassInitFunc) ephy_link_action_class_init,
 			NULL,
 			NULL, /* class_data */
 			sizeof (EphyLinkAction),