I solved the problem:
I searched through the net, and found this post:
http://markmail.org/message/zozobs24v4wyvf6p
and wondered if that quirk was causing my problem.
I already was using a subclass of Tree,
so added to the constructor:
DOM.setStyleAttribute(getElement(), "position", "static");
and; now the second tree is not disappearing when I select the first
tree.
I'm planning to file a bug on this issue.
On Jan 13, 12:06 pm, Jill Singer <jillre...@alum.mit.edu> wrote:
> when I have two trees on one page-
>
> even if they are in different "verticalpanels" (which I know are just
> columns in a table),
> when I select an item on the first; the second tree disappears.
>
> this behavior occurs in hosted mode and in ie, but not in firefox (and
> I need to make it work in ie; and hosted mode would be helpful)
>
> any ideas?
>
> (if I redraw one right after adding a new item to the other tree; then
> it will show up; but the selection problem is annoying...I don't want
> to be continually redrawing if I can help it)
>
> is this a css problem?
>
> please note: I'm using gwt 1.462 (and no, I cannot upgrade; that it
> the version my company is using now)
>
> here's some sample code that can be run to demonstrate the problem
> (just instantiate it and put it in an entry-point class):
> package com.amicas.gwt.qc.client.widgets.dragndrop;
>
> import com.google.gwt.user.client.ui.AbsolutePanel;
> import com.google.gwt.user.client.ui.HTML;
> import com.google.gwt.user.client.ui.Tree;
> import com.google.gwt.user.client.ui.TreeItem;
> import com.google.gwt.user.client.ui.HorizontalPanel;
> import com.google.gwt.user.client.ui.VerticalPanel;
>
> public class DualTreeTest extends AbsolutePanel {
>
> //
> STATIC //////////////////////////////////////////////////////////////////
> /** shorthand to refer to the left box */
> private static final int LEFT =0;
> /** shorthand to refer to the right box */
> private static final int RIGHT =1;
>
> //
> STATE //////////////////////////////////////////////////////////////////
> private VerticalPanel its_leftBox;
> private VerticalPanel its_rightBox;
>
> public DualTreeTest() {
>
> HorizontalPanel hpan = new HorizontalPanel();
> //hpan.setVerticalAlignment(HasVerticalAlignment.ALIGN_MIDDLE);
>
> its_leftBox = new VerticalPanel();
>
> its_leftBox.add(makeTree());
> its_leftBox.add(new HTML("<P>"));
> //its_leftBox.addMouseListener(new TreeMouseAdapter());
> hpan.add(its_leftBox);
>
> its_rightBox = new VerticalPanel();
> its_rightBox.add(makeTree());
> hpan.add(its_rightBox);
>
> add(hpan);
> }
>
> public Tree makeTree(){
> Tree leftTree = new Tree();
> TreeItem level1 = new TreeItem("level1-1");
> TreeItem leafa = new TreeItem("a");
> TreeItem leafb = new TreeItem("b");
> TreeItem leafc = new TreeItem("c");
> TreeItem leafd = new TreeItem("d");
>
> level1.addItem(leafa);
> level1.addItem(leafb);
> level1.addItem(leafc);
> level1.addItem(leafd);
>
> TreeItem level2 = new TreeItem("level1-2");
> TreeItem leafa2 = new TreeItem("a2");
> TreeItem leafb2 = new TreeItem("b3");
> TreeItem leafc2 = new TreeItem("c4");
> TreeItem leafd2 = new TreeItem("d5");
>
> level2.addItem(leafa2);
> level2.addItem(leafb2);
> level2.addItem(leafc2);
> level2.addItem(leafd2);
>
> leftTree.addItem(leve11);
> leftTree.addItem(leve12);
>
> return leftTree;
> }
>
> }
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