menu/container: add window_coords_change

The children container of a container have to be notified if the
window coordinates of the parent changed. The children have to
recalculate their own window coordinates.

2 files changed, 30 insertions, 2 deletions

diff --git a/src/menu/container.cpp b/src/menu/container.cpp
index 65b85aec..31155e3c 100644
--- a/src/menu/container.cpp
+++ b/src/menu/container.cpp
@@ -34,17 +34,19 @@ namespace usdx
 	Container::Container(Container* owner)
 		: DrawableControl(owner), frame(NULL), window_coords(0, 0)
 	{
-		set_clipping_required(true);
+		init(owner);
 	}
 
 	Container::Container(Container* owner, const ContainerHelper& add)
 		: DrawableControl(owner, add), frame(NULL), window_coords(0, 0)
 	{
-		set_clipping_required(true);
+		init(owner);
 	}
 
 	Container::~Container()
 	{
+		window_coords_connection.disconnect();
+
 		for (std::list<DrawableControl*>::iterator next = controls.begin(), it = next++;
 			 it != controls.end(); it = next++) {
 			(*it)->remove_parent();
@@ -53,6 +55,16 @@ namespace usdx
 		controls.clear();
 	}
 
+	void Container::init(Container* parent)
+	{
+		set_clipping_required(true);
+
+		if (parent) {
+			window_coords_connection = parent->window_coords_change.connect(
+				boost::bind(&Container::recalculate_window_coords, this));
+		}
+	}
+
 	void Container::draw(void)
 	{
 		DrawableControl::draw();
@@ -104,6 +116,8 @@ namespace usdx
 			window_coords.set_y(parent->get_window_coords().get_y() +
 								get_parent()->get_height() -
 								(get_top() + get_height()));
+
+			window_coords_change();
 		}
 	}
 
diff --git a/src/menu/container.hpp b/src/menu/container.hpp
index ac7d6129..f9eeacd5 100644
--- a/src/menu/container.hpp
+++ b/src/menu/container.hpp
@@ -26,6 +26,7 @@
 #define CONTAINER_HPP
 
 #include <list>
+#include <boost/signals2.hpp>
 #include <log4cpp/Category.hh>
 
 #include "drawable_control.hpp"
@@ -51,6 +52,14 @@ namespace usdx
 		Point<int> window_coords;
 		void recalculate_window_coords(void);
 
+		/**
+		 * Connection to recieve window coordinate changes from parent
+		 * container.
+		 */
+		boost::signals2::connection window_coords_connection;
+
+		void init(Container* parent);
+
 	protected:
 		Container(Container*, const ContainerHelper&);
 
@@ -95,6 +104,11 @@ namespace usdx
 		 * @see window_coords
 		 */
 		virtual void set_size(int width, int height);
+
+		/**
+		 * This signal gets emitted, if the window coordinates are changed.
+		 */
+		boost::signals2::signal<void ()> window_coords_change;
 	};
 };