Tags
People
Badges
Help-
CORE FRAMEWORK
FEATURED COMPONENTS
-
RESOURCES
-
LEARN ZK
RESOURCES
Hi,
I have two trees (A and B).
B is created (!), once the selection in A changes and I use two different AbstractTreeModels for both trees.
Now, I'd like to select the first item in (the newly created) tree B, once the selection in A changes.
However, at this point, tree B does not have any tree items which I could render.
I found this post: http://www.zkoss.org/forum/listComment/9809
But the solution there does not work for me, as the first child of my tree (B) is Treecols (and that again has Treecol, which does not have any kids).
So -- how can I send a "render now!" to tree B in order to select the first item?
Thanks!
Philipp
But if I use getTreechildren() or getItems(), the result is always null at this point...
Here's my code fragment:
// tree is "Tree A" in my description and we are in the Selection change event listener.
// structureTree is "Tree B".
// treeCell is the currently rendered cell in my TreeRenderer for "Tree A"
treeCell.addEventListener(Events.ON_CLICK, new EventListener<Event>(){
@Override
public void onEvent(Event event) throws Exception {
final Tree structureTree = (Tree) tree.getParent().getFellow("structureTree");
structureTree.setModel(new ProductStructureModel(tree));
structureTree.setVisible(true);
Treechildren treeChildren = structureTree.getTreechildren();
if (treeChildren != null) { // treeChildren is always null at this point.
Collection <Treeitem> items = treeChildren.getItems();
if (items != null && !items.isEmpty()) {
structureTree.selectItem(items.iterator().next());
}
}
}
});
So -- what am I missing?? Thanks!
Philipp
Hi Beren77,
The treeitem will not be rendered until you open its parent node, you can control the selection by model directly, for example:
zul
<zk> <window apply="test.TestComposer"> <tree id="treeA"> <treechildren> <treeitem label="select 2.1" /> <treeitem label="select 3.2.2" /> </treechildren> </tree> <tree id="treeB" /> </window> </zk>
composer
package test;
import java.util.ArrayList;
import java.util.List;
import org.zkoss.zk.ui.Component;
import org.zkoss.zk.ui.event.SelectEvent;
import org.zkoss.zk.ui.util.GenericForwardComposer;
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.Treecell;
import org.zkoss.zul.Treeitem;
import org.zkoss.zul.TreeitemRenderer;
import org.zkoss.zul.Treerow;
import org.zkoss.zul.ext.Selectable;
public class TestComposer extends GenericForwardComposer {
Tree treeB;
TreeModel _model;
public void doAfterCompose (Component comp) throws Exception {
super.doAfterCompose(comp);
treeB.setModel(getModel());
treeB.setItemRenderer(new InfoRenderer());
}
public void onSelect$treeA(SelectEvent event) {
String toSelect = ((Treeitem)event.getReference()).getLabel().replace("select ", "");
System.out.println(toSelect);
DefaultTreeNode root = (DefaultTreeNode)treeB.getModel().getRoot();
List<DefaultTreeNode> nodes = (List<DefaultTreeNode>)root.getChildren();
List<DefaultTreeNode> nextLevelNodes = new ArrayList<DefaultTreeNode>();
if (nodes != null && nodes.size() > 0) {
while (nodes.size() > 0) {
int size = nodes.size();
for (int i = 0; i < size; i++) {
DefaultTreeNode node = nodes.get(i);
System.out.println("node is " + node.getData());
if (node != null) {
if (toSelect.equals(node.getData())) {
((DefaultTreeModel)_model).addToSelection(node);
System.out.println(" found equals");
TreeNode parent = node.getParent();
while(parent != null) {
((DefaultTreeModel)_model).addOpenObject(parent);
parent = parent.getParent();
}
nodes.clear();
break;
}
if (node.getChildren() != null
&& node.getChildren().size() > 0) {
System.out.println(node.getChildren());
nextLevelNodes.addAll(node.getChildren());
}
}
}
nodes = nextLevelNodes;
nextLevelNodes = new ArrayList<DefaultTreeNode>();
}
}
}
public TreeModel getModel () {
if (_model == null) {
_model = new DefaultTreeModel(
new DefaultTreeNode(null,
new DefaultTreeNode[] {
new DefaultTreeNode("1"),
new DefaultTreeNode("2", new DefaultTreeNode[] {
new DefaultTreeNode("2.1"),
new DefaultTreeNode("2.2")
}
),
new DefaultTreeNode("3", new DefaultTreeNode[] {
new DefaultTreeNode("3.1"),
new DefaultTreeNode("3.2", new DefaultTreeNode[] {
new DefaultTreeNode("3.2.1"),
new DefaultTreeNode("3.2.2")
}
)
}
)
}
)
);
((Selectable)_model).setMultiple(true);
}
return _model;
}
class InfoRenderer implements TreeitemRenderer<DefaultTreeNode<String>> {
public void render(Treeitem item, DefaultTreeNode<String> data, int index) throws Exception {
String str = data.getData();
Treerow tr = new Treerow();
item.appendChild(tr);
tr.appendChild(new Treecell(str));
}
}
}
Regards,
Ben
Asked: 2012-10-23 09:52:27 +0800
Seen: 151 times
Last updated: Nov 06 '12