Bug 300681

Description Sascha Becher 2010-01-25 09:46:48 EST

I've copied the menu (on the left) of the RAP online demo:
http://rap.eclipsesource.com/rapdemo/examples#Buttons

this.mainExpandBar = new ExpandBar(parent, SWT.V_SCROLL);
this.mainExpandBar.setSpacing(4);
this.expandItem = new ExpandItem(this.expandBar, SWT.NONE);
this.expandItem.setText("Title"); // title of expand item

this.menuList = new List(this.expandBar, SWT.SINGLE);
this.menuList.add("Item 1");
this.menuList.add("Item 2");
redrawItem();

// the ExpandItems's onmouseover hovering effect works fine

this.menuList = new List(this.expandBar, SWT.SINGLE);
this.menuList.add("Item 3");
this.menuList.add("Item 4");
this.menuList.add("Item 5");
this.menuList.add("Item 6");
redrawItem();

// the onmouseover hovering works only in the area of the previously set List (on 'Item 3' and 'Item 4')

public void redrawItem() {
  this.menuList.setData(WidgetUtil.CUSTOM_VARIANT, "EXAMPLES"); //$NON-NLS-1$
  this.expandItem.setControl(this.menuList);
  int height = (this.menuList.getItemHeight() + 2) * this.menuList.getItemCount();
  this.expandItem.setHeight(height);
  this.expandItem.setExpanded(true);

  // desperately updating, doesn't change anything
  this.expandBar.update();
  this.expandBar.redraw();
  this.expandBar.layout();

}

It seems, the area responsible for onmouseover events doesn't get updated when the List is changed.

Additionally I had to add +2 to the height of the item. Otherwise the initial List hadn't the right height when drawn first. When redrawing the List with another list model, the +2 offset isn't required anymore and makes the list appear 2 pixels per line greater than needed. This happens only in Eclipse's internal web browser. In Firefox (3.5) and Internet Explorer (7) the offset isn't required at all.