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index.zulzul<zk>
<window border="normal" title="hello" apply="pkg$.TestComposer">
<vlayout>
<div>This fiddle simulates a real world scenario where we have a large tree and then the user can start an async operation that creates a new model and assign it to the tree (no its not built around echoEvent in real life).</div>
<div>When starting the refresh we clear the current model of the tree, and somehow this seems to cause the scrollposition to be left lingering at the client side.</div>
<div>1. Scroll to the middle of the tree around item 7000 or so</div>
<div>2. Click the button</div>
<div>3. The new model is loaded, but the scroll position is left at the middle of the tree and nothing but blank is shown</div>
<div>4. Scroll down in the tree somewhat and the client realizes that it needs to render some items and they appear on screen</div>
<div/>
<button id="btn" label="Change tree model" />
</vlayout>
<vlayout width="200px" height="300px" >
<tree id="theTree" width="100%" vflex="1" />
</vlayout>
</window>
</zk>
TestComposer.javajavaimport org.zkoss.zk.ui.*;
import org.zkoss.zk.ui.event.*;
import org.zkoss.zk.ui.util.*;
import org.zkoss.zk.ui.ext.*;
import org.zkoss.zk.au.*;
import org.zkoss.zk.au.out.*;
import org.zkoss.zul.*;
import java.util.*;
public class TestComposer extends GenericForwardComposer{
private Tree theTree;
public void doAfterCompose(Component comp) throws Exception {
super.doAfterCompose(comp);
theTree = (Tree) comp.getFellow("theTree");
theLabel = (Label) comp.getFellow("theLabel");
List<DefaultTreeNode> childnodes = new ArrayList<DefaultTreeNode>();
for( int i=0; i<15000; ++i) {
childnodes.add(new DefaultTreeNode("" + i));
}
DefaultTreeNode root = new DefaultTreeNode("",childnodes);
theTree.setModel(new DefaultTreeModel(root));
theTree.addEventListener("onNewModel", event -> {
Thread.sleep(2000);
Clients.clearBusy();
theTree.setModel((DefaultTreeModel) event.getData());
theTree.invalidate();
});
}
public void onClick$btn(Event e) throws InterruptedException{
List<DefaultTreeNode> childnodes = new ArrayList<DefaultTreeNode>();
for( int i=15000; i>0; --i) {
childnodes.add(new DefaultTreeNode("" + i));
}
DefaultTreeNode root = new DefaultTreeNode("",childnodes);
// Current scroll position in tree does not seem to be reset when clearing model.
// The same issue occurs if replacing the echoEvent with just setting the new model after first setting null.
theTree.setModel(null);
Clients.showBusy("Loading new model...");
Events.echoEvent("onNewModel", theTree, new DefaultTreeModel(root));
//theTree.setModel(new DefaultTreeModel(root));
//theTree.invalidate();
}
}