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index.zulzul<zk>
1. Please open the tree node "node 1" and "node 1.1" to display the node "node 1.1.1"
<separator/>
2. click the button "update data", the tree structure should be the same as before, only all the content are updated
<separator/>
3. click the button "rebuild model", the tree structure should be the same as before, only all the content are updated
<div apply="pkg$.B70_ZK_2764">
<tree id="dyntree" width="400px">
<custom-attributes org.zkoss.zul.client.rod="false"/>
</tree>
<button id="updateButton" label="update data"/>
<button id="rebuildButton" label="rebuild model"/>
</div>
</zk>
B70_ZK_2764.javajava
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import org.zkoss.zk.ui.Component;
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.zul.DefaultTreeModel;
import org.zkoss.zul.DefaultTreeNode;
import org.zkoss.zul.Tree;
import org.zkoss.zul.TreeNode;
import org.zkoss.zul.Treecell;
import org.zkoss.zul.Treeitem;
import org.zkoss.zul.TreeitemRenderer;
import org.zkoss.zul.Treerow;
/**
* @author jumperchen
*
*/
public class B70_ZK_2764 extends SelectorComposer<Component> {
private static final long serialVersionUID = 1L;
private int count = 0;
@Wire("#dyntree")
private Tree tree;
private DefaultTreeModel<String> treeModel;
@Override
public void doAfterCompose(Component comp) throws Exception {
super.doAfterCompose(comp);
treeModel = new DefaultTreeModel<String>(newNode("root", level1Nodes()));
tree.setItemRenderer(getTreeItemRenderer());
tree.setModel(treeModel);
}
//causes the problem
@Listen("onClick = #updateButton")
public void updateData() {
updateDataRecursively(treeModel.getRoot());
}
private void updateDataRecursively(TreeNode<String> node) {
node.setData(node.getData() + ".");
List<TreeNode<String>> children = node.getChildren();
for (TreeNode<String> child : children) {
updateDataRecursively(child);
}
}
//workaround
@Listen("onClick = #rebuildButton")
public void rebuildModel() {
//backup open paths
int[][] openPaths = treeModel.getOpenPaths();
treeModel.clearOpen();
TreeNode<String> root = treeModel.getRoot();
root.getChildren().clear();
root.getChildren().addAll(level1Nodes());
//restore open paths (optional)
treeModel.addOpenPaths(openPaths);
};
@SuppressWarnings("unchecked")
private List<TreeNode<String>> level1Nodes() {
return Arrays.asList(
newNode("node 1",
newNode("node 1.1",
newNode("node 1.1.1"),
newNode("node 1.1.2")
)
),
newNode("node 2",
newNode("node 2.1")
),
newNode("node 3",
newNode("node 3.1")
),
newNode("node 4",
newNode("node 4.1")
),
newNode("node 5",
newNode("node 5.1")
));
};
private TreeNode<String> newNode(String data, Collection<TreeNode<String>> children) {
return new DefaultTreeNode<String>(treeLabel(data), children);
}
private TreeNode<String> newNode(String data, TreeNode<String>... children) {
return new DefaultTreeNode<String>(treeLabel(data), children);
}
private String treeLabel(String data) {
return data + " (" + count++ + ")";
}
private TreeitemRenderer<TreeNode<String>> getTreeItemRenderer() {
return new TreeitemRenderer<TreeNode<String>>() {
public void render(Treeitem item, TreeNode<String> data, int index) throws Exception {
Treerow treerow = item.getTreerow();
if(treerow == null) {
treerow = new Treerow();
item.appendChild(treerow);
treerow.appendChild(new Treecell(data.getData()));
} else {
System.out.println("got here"); //never got here in my tests
Treecell firstcell = (Treecell) treerow.getFirstChild();
firstcell.setLabel(data.getData());
}
}
};
}
}