add optional notification of childs when parent moves

3 files changed, 24 insertions, 3 deletions

diff --git a/lib/gui/evideo.cpp b/lib/gui/evideo.cpp
index 8151e800..02d8a529 100644
--- a/lib/gui/evideo.cpp
+++ b/lib/gui/evideo.cpp
@@ -2,6 +2,7 @@
 
 eVideoWidget::eVideoWidget(eWidget *parent): eWidget(parent)
 {
+	parent->setPositionNotifyChild(1);
 }
 
 int eVideoWidget::event(int event, void *data, void *data2)
@@ -10,6 +11,7 @@ int eVideoWidget::event(int event, void *data, void *data2)
 	{
 	case evtChangedPosition:
 	case evtChangedSize:
+	case evtParentChangedPosition:
 		eDebug("position is now ...");
 		updatePosition();
 	}
diff --git a/lib/gui/ewidget.cpp b/lib/gui/ewidget.cpp
index 7c50f4af..e0504296 100644
--- a/lib/gui/ewidget.cpp
+++ b/lib/gui/ewidget.cpp
@@ -23,6 +23,8 @@ eWidget::eWidget(eWidget *parent): m_animation(this), m_parent(parent ? parent->
 
 	m_current_focus = 0;
 	m_focus_owner = 0;
+	
+	m_notify_child_on_position_change = 1;
 }
 
 void eWidget::move(ePoint pos)
@@ -38,6 +40,11 @@ void eWidget::move(ePoint pos)
 	m_position = pos;
 	
 	event(evtChangedPosition);
+	
+	if (m_notify_child_on_position_change)
+		for (ePtrList<eWidget>::iterator i(m_childs.begin()); i != m_childs.end(); ++i)
+			i->event(evtParentChangedPosition);
+		
 	recalcClipRegionsWhenVisible();
 	
 		/* try native move if supported. */
@@ -64,6 +71,11 @@ void eWidget::resize(eSize size)
 	
 	invalidate();
 	event(evtChangedSize);
+
+	if (m_notify_child_on_position_change)
+		for (ePtrList<eWidget>::iterator i(m_childs.begin()); i != m_childs.end(); ++i)
+			i->event(evtParentChangedPosition); /* position/size is the same here */
+
 	recalcClipRegionsWhenVisible();	
 	invalidate();
 }
@@ -340,10 +352,12 @@ int eWidget::event(int event, void *data, void *data2)
 		m_size = *static_cast<eSize*>(data);
 		break;
 	case evtChangedSize:
-	{
 		m_clip_region = gRegion(eRect(ePoint(0, 0),  m_size));
 		break;
-	}
+	case evtParentChangedPosition:
+		for (ePtrList<eWidget>::iterator i(m_childs.begin()); i != m_childs.end(); ++i)
+			i->event(evtParentChangedPosition);
+		break;
 	case evtFocusGot:
 		m_focus_owner = (eWidget*)data;
 		break;
diff --git a/lib/gui/ewidget.h b/lib/gui/ewidget.h
index 4175eae7..22f5103b 100644
--- a/lib/gui/ewidget.h
+++ b/lib/gui/ewidget.h
@@ -82,7 +82,7 @@ private:
 	eWidget *m_current_focus, *m_focus_owner;
 	
 	int m_z_position;
-	
+	int m_notify_child_on_position_change;
 protected:
 	virtual ~eWidget();
 	void mayKillFocus();
@@ -99,6 +99,8 @@ public:
 		evtChangedPosition,
 		evtChangedSize,
 		
+		evtParentChangedPosition,
+		
 		evtWillShow,
 		evtWillHide,
 		evtWillChangePosition, /* new size is eRect *data */
@@ -113,6 +115,9 @@ public:
 	};
 	virtual int event(int event, void *data = 0, void *data2 = 0);
 	void setFocus(eWidget *focus);
+
+		/* enable this if you need the absolute position of the widget */
+	void setPositionNotifyChild(int n) { m_notify_child_on_position_change = 1; }
 };
 
 extern eWidgetDesktop *getDesktop(int which);