Add the has_widget() function.

src/gui/widgets/container.hpp

@@ -49,6 +49,10 @@ public:
 		return result ? result : grid_.get_widget_by_id(id); 
 	}
 
+	/** Inherited from twidget.*/
+	bool has_widget(const twidget* widget) const 
+		{ return grid_.has_widget(widget); }
+
 	/** Inherited from tcontrol. */
 	tpoint get_minimum_size() const { return grid_.get_minimum_size(); }
 

src/gui/widgets/grid.cpp

@@ -393,6 +393,18 @@ twidget* tgrid::get_widget_by_id(const std::string& id)
 	return twidget::get_widget_by_id(id);
 }
 
+bool tgrid::has_widget(const twidget* widget) const
+{
+	for(std::vector<tchild>::const_iterator itor = children_.begin();
+			itor != children_.end(); ++itor) {
+	
+		if(itor->widget() == widget) {
+			return true;
+		}
+	}
+	return false;
+}
+
 void tgrid::draw(surface& surface)
 {
 	for(iterator itor = begin(); itor != end(); ++itor) {

src/gui/widgets/grid.hpp

@@ -103,6 +103,9 @@ public:
 	//! Override base class.
 	twidget* get_widget_by_id(const std::string& id);
 
+	/** Inherited from twidget.*/
+	bool has_widget(const twidget* widget) const;
+
 	//! Inherited from twidget.
 	void draw(surface& surface);
 

src/gui/widgets/widget.hpp

@@ -188,6 +188,14 @@ public:
 	virtual twidget* get_widget_by_id(const std::string& id)
 		{ return id_ == id ? this : 0; }
 
+	/** 
+	 * Does the widget contain the widget.
+	 *
+	 * This makes more sence in container classes.
+	 */
+	virtual bool has_widget(const twidget* widget) const 
+		{ return widget == this; }
+
 	//! The toplevel item should always be a window if not null is returned
 	twindow* get_window();