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index.zulzul<zk>
<window border="normal" title="hello" apply="pkg$.TestComposer">
<div>This demonstrates a performance problem in IE with the fireEvent method in TreeModel to remove many tree items.
Tested with IE11.
Chrome has no problems at all.
Invalidating the tree after changing the model and firing the events fixes the performance problem, but should that really be necessary?
And if so, how come it works just fine without it in Chrome?
</div>
<button id="btnRemove" label="Remove a bunch of tree items" />
<tree id="tree" height="200px" width="200px"/>
</window>
</zk>
TestComposer.javajavaimport org.zkoss.zk.ui.*;
import org.zkoss.zk.ui.event.*;
import org.zkoss.zk.ui.util.*;
import org.zkoss.zk.ui.ext.*;
import org.zkoss.zk.au.*;
import org.zkoss.zk.au.out.*;
import org.zkoss.zul.*;
import java.util.*;
public class TestComposer extends GenericForwardComposer{
Tree tree;
public void doAfterCompose(Component comp) throws Exception {
super.doAfterCompose(comp);
tree = (Tree)comp.getFellow("tree");
tree.setItemRenderer(new TreeitemRenderer() {
public void render(Treeitem item, Object data, int index) {
Treerow treerow = new Treerow();
treerow.setParent(item);
Treecell treecell = new Treecell();
treecell.setParent(treerow);
treecell.appendChild(new Label((String)((TestNode)data).getLabel()));
}
});
List<TestNode> list = new ArrayList<TestNode>();
for( int i=0; i<1500; ++i) {
list.add(new TestNode("" +i));
}
TestNode node = new TestNode("main",list);
TestTreeModel model = new TestTreeModel(node);
tree.setModel(model);
}
public void onClick$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();
}
}
TestTreeModel.javajava
import org.zkoss.zul.*;
import org.zkoss.zul.event.*;
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);
}
}
@Override
public Object getChild(final Object parentObject, final int index)
{
TestNode node = (TestNode)parentObject;
return node.getChildren().get(index);
}
@Override
public int getChildCount(final Object parentObject)
{
return ((TestNode)parentObject).getChildren().size();
}
@Override
public boolean isLeaf(final Object parentObject)
{
return getChildCount(parentObject) == 0;
}
@Override
public int getIndexOfChild(Object parent, Object child)
{
TestNode node = (TestNode)parent;
return node.getChildren().indexOf((TestNode)child);
}
}
TestNode.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.*;
import java.util.*;
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;
}
}