patch from Rob Stevens to add dragndrop-reordering of the tabs

src/FbWinFrame.cc

@@ -357,6 +357,113 @@ void FbWinFrame::moveLabelButtonRight(const FbTk::TextButton &btn) {
     redrawTitle();
 }
 
+void FbWinFrame::moveLabelButtonTo(FbTk::TextButton &btn, int x, int y) {
+	Window parent_return=0,
+	       root_return=75,
+	       *children_return=NULL;
+	unsigned int nchildren_return;
+	//get the root window
+	if(!XQueryTree(FbTk::App::instance()->display(), window().window(),
+			&root_return, &parent_return, &children_return, &nchildren_return))
+		parent_return=parent_return;//return;
+	if(children_return!=NULL)
+		XFree(children_return);
+	int dest_x=0, dest_y=0;
+	Window labelbutton=0;
+	if(!XTranslateCoordinates(FbTk::App::instance()->display(),
+				root_return, label().window(),
+				x,y, &dest_x, &dest_y,
+				&labelbutton))
+		return;
+	LabelList::iterator it = m_labelbuttons.begin();
+	LabelList::iterator it_end = m_labelbuttons.end();
+	//find the label button to move next to
+	for(; it!=it_end; it++) {
+		if( (*it)->window()==labelbutton)
+			break;
+	}
+	//label button not found
+	if(it==it_end)
+		return;
+	Window child_return=0;
+	//make x and y relative to our labelbutton
+	if(!XTranslateCoordinates(FbTk::App::instance()->display(),
+			        label().window(),labelbutton,
+				dest_x,dest_y, &x, &y,
+				&child_return))
+		return;
+	if(x>(*it)->width()/2)
+		moveLabelButtonRightOf(btn,**it);
+	else
+		moveLabelButtonLeftOf(btn,**it);
+
+}
+
+
+
+void FbWinFrame::moveLabelButtonLeftOf(const FbTk::TextButton &btn, const FbTk::TextButton &dest) {
+	LabelList::iterator it = find(m_labelbuttons.begin(),
+                                  m_labelbuttons.end(),
+                                  &btn);
+	LabelList::iterator new_pos = find(m_labelbuttons.begin(),
+				       m_labelbuttons.end(),
+				       &dest);
+
+	// make sure we found them
+	if (it == m_labelbuttons.end() || new_pos==m_labelbuttons.end())
+	{
+		cout<<"button to move not found"<<endl;
+		return;
+	}
+	//moving a button to the left of itself results in no change
+	if( new_pos == it)
+	{
+		cout<<"source and dest button are the same"<<endl;
+		return;
+	}
+	FbTk::TextButton *item = *it;
+	//remove from list
+	m_labelbuttons.erase(it);
+	//insert on the new place
+	m_labelbuttons.insert(new_pos, item);
+	//update titlebar
+	redrawTitle();
+}
+
+void FbWinFrame::moveLabelButtonRightOf(const FbTk::TextButton &btn, const FbTk::TextButton &dest) {
+	LabelList::iterator it = find(m_labelbuttons.begin(),
+                                  m_labelbuttons.end(),
+                                  &btn);
+	LabelList::iterator new_pos = find(m_labelbuttons.begin(),
+				       m_labelbuttons.end(),
+				       &dest);
+
+	// make sure we found them
+	if (it == m_labelbuttons.end() || new_pos==m_labelbuttons.end())
+	{
+		cout<<"button to move not found"<<endl;
+		return;
+	}
+	//moving a button to the right of itself results in no change
+	if( new_pos == it)
+	{
+		cout<<"source and dest button are the same"<<endl;
+		return;
+	}
+	FbTk::TextButton *item = *it;
+	//remove from list
+	m_labelbuttons.erase(it);
+	//need to insert into the next position
+	new_pos++;
+	//insert on the new place
+	if(new_pos == m_labelbuttons.end())
+		m_labelbuttons.push_back(item);
+	else
+		m_labelbuttons.insert(new_pos, item);
+	//update titlebar
+	redrawTitle();
+}
+
 void FbWinFrame::setLabelButtonFocus(FbTk::TextButton &btn) {
     if (&btn == currentLabel())
         return;

src/FbWinFrame.hh

@@ -105,6 +105,12 @@ public:
     void moveLabelButtonLeft(const FbTk::TextButton &btn);
     /// move label button to the right
     void moveLabelButtonRight(const FbTk::TextButton &btn);
+    /// move label button to the given location( x and y are relative to the root window)
+    void moveLabelButtonTo(FbTk::TextButton &btn, int x, int y);
+    /// move the first label button to the left of the second
+    void moveLabelButtonLeftOf(const FbTk::TextButton &btn, const FbTk::TextButton &dest);
+    //move the first label button to the right of the second
+    void moveLabelButtonRightOf(const FbTk::TextButton &btn, const FbTk::TextButton &dest);
     /// which button is to be rendered focused
     void setLabelButtonFocus(FbTk::TextButton &btn);
     /// attach a client window for client area