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index.zulzul<zk>
<window border="normal" title="hello" apply="pkg$.TestComposer">
<button id="btn" label="Click to switch to smaller model. Invalidate of tree causes scroll to bug out" />
<vlayout height="100px" width="200px">
<tree id="tree" vflex="1"/>
</vlayout>
</window>
</zk>
TestComposer.javajavaimport java.util.ArrayList;
import java.util.List;
import org.zkoss.zk.ui.event.Event;
import org.zkoss.zk.ui.event.EventListener;
import org.zkoss.zk.ui.event.Events;
import org.zkoss.zk.ui.select.SelectorComposer;
import org.zkoss.zk.ui.select.annotation.Listen;
import org.zkoss.zk.ui.select.annotation.Wire;
import org.zkoss.zk.ui.util.Clients;
import org.zkoss.zul.DefaultTreeModel;
import org.zkoss.zul.DefaultTreeNode;
import org.zkoss.zul.Tree;
import org.zkoss.zul.TreeModel;
import org.zkoss.zul.TreeNode;
import org.zkoss.zul.Window;
public class TestComposer extends SelectorComposer<Window> {
private static final long serialVersionUID = -9128966464410462643L;
@Wire
private Tree tree;
private DefaultTreeModel<String> largeModel;
private DefaultTreeModel<String> smallModel;
private DefaultTreeNode<String> selectedNode;
public void doAfterCompose(Window comp) throws Exception {
super.doAfterCompose(comp);
List<TreeNode<String>> treeNodes = new ArrayList<TreeNode<String>>();
for (int i = 0; i < 100; ++i) {
List<TreeNode<String>> subnodes = new ArrayList<TreeNode<String>>();
for (int j = 0; j < 2; ++j) {
DefaultTreeNode<String> subnode = new DefaultTreeNode<String>("item " + j);
subnodes.add(subnode);
if (i == 99 && j == 1) {
selectedNode = subnode;
}
}
treeNodes.add(new DefaultTreeNode<String>("item " + i, subnodes));
}
largeModel = new DefaultTreeModel<String>(new DefaultTreeNode<String>("root", treeNodes));
// Set and open via TreeModel
largeModel.addToSelection(selectedNode);
largeModel.addOpenObject(selectedNode.getParent());
treeNodes = new ArrayList<TreeNode<String>>();
treeNodes.add(new DefaultTreeNode<String>("the item"));
tree.setModel(largeModel);
comp.addEventListener("onRenderTheNode", new EventListener<Event>() {
public void onEvent(Event event) {
Clients.scrollIntoView(tree.renderItemByNode(selectedNode));
}
});
Events.echoEvent("onRenderTheNode", comp, null);
smallModel = new DefaultTreeModel<String>(new DefaultTreeNode<String>("root", treeNodes));
}
@Listen("onClick=#btn")
public void changeModel() {
TreeModel<String> model = tree.getModel();
tree.setModel(model.equals(smallModel) ? largeModel : smallModel);
}
}