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index.zulzul<?xml version="1.0" encoding="UTF-8"?>
<!--
B80-ZK-2901.zul
Purpose:
Description:
History:
Tue Oct 27 12:52:20 CST 2015, Created by jumperchen
Copyright (C) 2015 Potix Corporation. All Rights Reserved.
-->
<zk>
<window border="normal" title="hello" apply="org.zkoss.zktest.test2.B80_ZK_2901Composer">
<label multiline="true">
1. Click the button "Remove a bunch of tree items".
2. You should see the top one item is "1490" and display in 3 seconds (IE only), if it displays in 10 seconds or more, that's a bug.
</label>
<!--<div>This demonstrates a performance problem in IE with the fireEvent method in TreeModel to remove many tree items.-->
<!--Tested with IE11. -->
<!--Chrome has no problems at all.-->
<!--Invalidating the tree after changing the model and firing the events fixes the performance problem, but should that really be necessary?-->
<!--And if so, how come it works just fine without it in Chrome?-->
<!--</div>-->
<button id="btnRemove" label="Remove a bunch of tree items" />
<tree id="tree" height="200px" width="200px"/>
</window>
</zk>
B80_ZK_2901Composer.javajavaimport org.zkoss.zk.ui.*;
import org.zkoss.zk.ui.event.*;
import org.zkoss.zk.ui.util.*;
import org.zkoss.zk.ui.ext.*;
import org.zkoss.zk.au.*;
import org.zkoss.zk.au.out.*;
import org.zkoss.zul.*;
public class B80_ZK_2901Composer extends GenericForwardComposer {
Tree tree;
public void doAfterCompose(Component comp) throws Exception {
super.doAfterCompose(comp);
tree = (Tree)comp.getFellow("tree");
tree.setItemRenderer(new TreeitemRenderer() {
public void render(Treeitem item, Object data, int index) {
Treerow treerow = new Treerow();
treerow.setParent(item);
Treecell treecell = new Treecell();
treecell.setParent(treerow);
treecell.appendChild(new Label((String)((TestNode)data).getLabel()));
}
});
List<TestNode> list = new ArrayList<TestNode>();
for( int i=0; i<1500; ++i) {
list.add(new TestNode("" +i));
}
TestNode node = new TestNode("main",list);
TestTreeModel model = new TestTreeModel(node);
tree.setModel(model);
}
public void onClick$btnRemove(Event e) throws InterruptedException{
// Remove a bunch of nodes from the model and fire a TreeDataEvent.INTERVAL_REMOVED for each
//
((TestTreeModel)tree.getModel()).remove();
// Invalidating the tree solves the problem, but should this really be needed?
// Seems that Chrome is just fine without it, so why is it needed in IE11?
//
// tree.invalidate();
}
public class TestNode {
List<TestNode> children;
String label;
public TestNode(String label) {
this(label, new ArrayList<TestNode>());
}
public TestNode(String label, List<TestNode> children) {
this.label = label;
this.children = children;
}
public String getLabel() {
return label;
}
public List<TestNode> getChildren() {
return children;
}
}
public class TestTreeModel extends AbstractTreeModel {
public TestTreeModel(TestNode root) {
super(root);
}
public void remove() {
// I know that it would be better to fire one event here with different from and to index.
// This is just to point out the problem
//
for( int i=0; i<1490; ++i) {
((TestNode)getRoot()).getChildren().remove(0);
this.fireEvent(getRoot(), 0, 0, TreeDataEvent.INTERVAL_REMOVED);
}
}
public Object getChild(final Object parentObject, final int index)
{
TestNode node = (TestNode)parentObject;
return node.getChildren().get(index);
}
public int getChildCount(final Object parentObject)
{
return ((TestNode)parentObject).getChildren().size();
}
public boolean isLeaf(final Object parentObject)
{
return getChildCount(parentObject) == 0;
}
public int getIndexOfChild(Object parent, Object child)
{
TestNode node = (TestNode)parent;
return node.getChildren().indexOf((TestNode)child);
}
}
}