@@ -61,6 +61,7 @@ render_background = 0;
 	systray.alpha = 100;
 	systray.sort = 3;
 	systray.area._draw_foreground = draw_systray;
+	systray.area._on_change_layout = on_change_systray;
 	systray.area.size_mode = SIZE_BY_CONTENT;
 	systray.area._resize = resize_systray;
 }
@@ -114,52 +115,6 @@ 
 
 void draw_systray(void *obj, cairo_t *c)
 {
-	// here, sysbar's position is defined. so we can calculate position of tray icon.
-	Systraybar *sysbar = obj;
-	Panel *panel = sysbar->area.panel;
-	int i, posx, posy;
-	int start = panel->area.bg->border.width + panel->area.paddingy + systray.area.bg->border.width + systray.area.paddingy +sysbar->marging/2;
-	if (panel_horizontal) {
-		posy = start;
-		posx = systray.area.posx + systray.area.bg->border.width + systray.area.paddingxlr;
-	}
-	else {
-		posx = start;
-		posy = systray.area.posy + systray.area.bg->border.width + systray.area.paddingxlr;
-	}
-
-	TrayWindow *traywin;
-	GSList *l;
-	for (i=1, l = systray.list_icons; l ; i++, l = l->next) {
-		traywin = (TrayWindow*)l->data;
-		if (traywin->hide) continue;
-
-		traywin->y = posy;
-		traywin->x = posx;
-		traywin->width = sysbar->icon_size;
-		traywin->height = sysbar->icon_size;
-		if (panel_horizontal) {
-			if (i % sysbar->icons_per_column)
-				posy += sysbar->icon_size + sysbar->area.paddingx;
-			else {
-				posy = start;
-				posx += (sysbar->icon_size + systray.area.paddingx);
-			}
-		}
-		else {
-			if (i % sysbar->icons_per_row)
-				posx += sysbar->icon_size + systray.area.paddingx;
-			else {
-				posx = start;
-				posy += (sysbar->icon_size + systray.area.paddingx);
-			}
-		}
-
-		// position and size the icon window
-		XMoveResizeWindow(server.dsp, traywin->id, traywin->x, traywin->y, sysbar->icon_size, sysbar->icon_size);
-		XResizeWindow(server.dsp, traywin->tray_id, sysbar->icon_size, sysbar->icon_size);
-	}
-
 	if (server.real_transparency || systray.alpha != 100 || systray.brightness != 0 || systray.saturation != 0) {
 		if (render_background) XFreePixmap(server.dsp, render_background);
 		render_background = XCreatePixmap(server.dsp, server.root_win, systray.area.width, systray.area.height, server.depth);
@@ -207,6 +162,56 @@ sysbar->icons_per_column = count / sysbar->icons_per_row+ (count%sysbar->icons_per_row != 0);
 		systray.area.height = (2 * systray.area.bg->border.width) + (2 * systray.area.paddingxlr) + (sysbar->icon_size * sysbar->icons_per_column) + ((sysbar->icons_per_column-1) * systray.area.paddingx);
 	}
 	return 1;
+}
+
+
+void on_change_systray (void *obj)
+{
+	// here, sysbar's position is defined. so we can calculate position of tray icon.
+	Systraybar *sysbar = obj;
+	Panel *panel = sysbar->area.panel;
+	int i, posx, posy;
+	int start = panel->area.bg->border.width + panel->area.paddingy + systray.area.bg->border.width + systray.area.paddingy +sysbar->marging/2;
+	if (panel_horizontal) {
+		posy = start;
+		posx = systray.area.posx + systray.area.bg->border.width + systray.area.paddingxlr;
+	}
+	else {
+		posx = start;
+		posy = systray.area.posy + systray.area.bg->border.width + systray.area.paddingxlr;
+	}
+
+	TrayWindow *traywin;
+	GSList *l;
+	for (i=1, l = systray.list_icons; l ; i++, l = l->next) {
+		traywin = (TrayWindow*)l->data;
+		if (traywin->hide) continue;
+
+		traywin->y = posy;
+		traywin->x = posx;
+		traywin->width = sysbar->icon_size;
+		traywin->height = sysbar->icon_size;
+		if (panel_horizontal) {
+			if (i % sysbar->icons_per_column)
+				posy += sysbar->icon_size + sysbar->area.paddingx;
+			else {
+				posy = start;
+				posx += (sysbar->icon_size + systray.area.paddingx);
+			}
+		}
+		else {
+			if (i % sysbar->icons_per_row)
+				posx += sysbar->icon_size + systray.area.paddingx;
+			else {
+				posx = start;
+				posy += (sysbar->icon_size + systray.area.paddingx);
+			}
+		}
+
+		// position and size the icon window
+		XMoveResizeWindow(server.dsp, traywin->id, traywin->x, traywin->y, sysbar->icon_size, sysbar->icon_size);
+		XResizeWindow(server.dsp, traywin->tray_id, sysbar->icon_size, sysbar->icon_size);
+	}
 }
 
 

@@ -65,6 +65,7 @@ void init_systray_panel(void *p);
 
 void draw_systray(void *obj, cairo_t *c);
 int  resize_systray(void *obj);
+void on_change_systray(void *obj);
 
 
 // systray protocol

@@ -344,9 +344,6 @@ int width=0, height;
 	Panel *panel = (Panel*)tsk->area.panel;
 	//printf("draw_task %d %d\n", tsk->area.posx, tsk->area.posy);
 
-	long value[] = { panel->posx+tsk->area.posx, panel->posy+tsk->area.posy, tsk->area.width, tsk->area.height };
-	XChangeProperty (server.dsp, tsk->win, server.atom._NET_WM_ICON_GEOMETRY, XA_CARDINAL, 32, PropModeReplace, (unsigned char*)value, 4);
-
 	if (panel->g_task.text) {
 		/* Layout */
 		layout = pango_cairo_create_layout (c);
@@ -386,6 +383,19 @@ 
 	if (panel->g_task.icon) {
 		draw_task_icon (tsk, width);
 	}
+}
+
+
+void on_change_task (void *obj)
+{
+	Task *tsk = obj;
+	Panel *panel = (Panel*)tsk->area.panel;
+
+	long value[] = { panel->posx+tsk->area.posx, panel->posy+tsk->area.posy, tsk->area.width, tsk->area.height };
+	XChangeProperty (server.dsp, tsk->win, server.atom._NET_WM_ICON_GEOMETRY, XA_CARDINAL, 32, PropModeReplace, (unsigned char*)value, 4);
+	
+	// reset Pixmap when position/size changed
+	set_task_redraw(tsk);
 }
 
 

@@ -69,6 +69,7 @@ Task *add_task (Window win);
 void remove_task (Task *tsk);
 
 void draw_task (void *obj, cairo_t *c);
+void on_change_task (void *obj);
 
 void get_icon (Task *tsk);
 void get_title(Task *tsk);

@@ -125,6 +125,7 @@ 
 	// task
 	panel->g_task.area.size_mode = SIZE_BY_LAYOUT;
 	panel->g_task.area._draw_foreground = draw_task;
+	panel->g_task.area._on_change_layout = on_change_task;
 	panel->g_task.area.redraw = 1;
 	panel->g_task.area.on_screen = 1;
 	if ((panel->g_task.config_asb_mask & (1<<TASK_NORMAL)) == 0) {
@@ -296,7 +297,6 @@ // change pos_x and width for all tasks
 		for (l = taskbar->area.list; l ; l = l->next) {
 			tsk = l->data;
 			if (!tsk->area.on_screen) continue;
-			//set_task_redraw(tsk);  // always redraw task, because the background could have changed (taskbar_active_id)
 			tsk->area.width = pixel_width;
 
 			if (modulo_width) {
@@ -331,7 +331,6 @@ // change pos_y and height for all tasks
 		for (l = taskbar->area.list; l ; l = l->next) {
 			tsk = l->data;
 			if (!tsk->area.on_screen) continue;
-			//set_task_redraw(tsk);  // always redraw task, because the background could have changed (taskbar_active_id)
 			tsk->area.height = pixel_height;
 
 			if (modulo_height) {

@@ -116,6 +116,7 @@ for (l = a->list; l ; l = l->next)
 		size_by_content(l->data);
 	
 	// calculate area's size
+	a->on_changed = 0;
 	if (a->resize && a->size_mode == SIZE_BY_CONTENT) {
 		a->resize = 0;
 
@@ -123,8 +124,9 @@ if (a->_resize) {
 			if (a->_resize(a)) {
 				// 'size' changed => 'resize = 1' on the parent and redraw object
 				((Area*)a->parent)->resize = 1;
+				a->on_changed = 1;
+				a->redraw = 1;
 			}
-			a->redraw = 1;
 		}
 	}
 }
@@ -144,6 +146,7 @@ 
 		if (a->_resize) {
 			if (a->_resize(a)) {
 				// if 'size' changed then 'resize = 1' on childs with SIZE_BY_LAYOUT
+				a->on_changed = 1;
 				for (l = a->list; l ; l = l->next) {
 					if (((Area*)l->data)->size_mode == SIZE_BY_LAYOUT)
 						((Area*)l->data)->resize = 1;
@@ -164,6 +167,7 @@ if (panel_horizontal) {
 			if (pos != child->posx) {
 				// pos changed => redraw
 				child->posx = pos;
+				child->on_changed = 1;
 				child->redraw = 1;
 			}
 		}
@@ -171,6 +175,7 @@ else {
 			if (pos != child->posy) {
 				// pos changed => redraw
 				child->posy = pos;
+				child->on_changed = 1;
 				child->redraw = 1;
 			}
 		}
@@ -183,6 +188,9 @@ pos += child->width + a->paddingx;
 		else
 			pos += child->height + a->paddingx;
 	}
+	
+	if (a->on_changed && a->_on_change_layout)
+		a->_on_change_layout (a);
 }
 
 

@@ -85,8 +85,9 @@ void (*_draw_foreground)(void *obj, cairo_t *c);
 	// update area's content and update size (width/heith). 
 	// return '1' if size changed, '0' otherwise.
 	int (*_resize)(void *obj);
-	void (*_add_child)(void *obj);
-	int (*_remove_child)(void *obj);
+	// after pos/size changed, the rendering engine will call _on_change_layout(Area*)
+	int on_changed;
+	void (*_on_change_layout)(void *obj);
 	const char* (*_get_tooltip_text)(void *obj);
 } Area;