Hello Sumit Chandel,
it does not work in hosted mode, with IE7 and Firefox3.
I added no widgets to the tree, only Strings in the Constructor of
TreeItem, my implementation of setDefaults() looked like yours.
So when I run the app (in hosted mode) I can click on "root" and the
branch is opened. If I click on a leaf below the root item, the
controller is called once and performs the Window.alert(item.getText
()); command. Clicking on "moreitems" performs the action like
expected. But if I click once more on moreitems, the event is fired
twice and the branch will be closed and opened again. This behavior
seems weird to me.
Greetings meandi
I tried again in a new project, to ensure that no side effects appear.
Here is the source code:
NavigationView.java
package de.jomawo.tree.client;
import com.google.gwt.event.logical.shared.SelectionEvent;
import com.google.gwt.event.logical.shared.SelectionHandler;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.Panel;
import com.google.gwt.user.client.ui.Tree;
import com.google.gwt.user.client.ui.TreeItem;
import com.google.gwt.user.client.ui.VerticalPanel;
public class NavigationView extends Composite implements
SelectionHandler<TreeItem> {
// Attribute
Panel panel = new VerticalPanel();
Tree tree = new Tree();
ApplicationController controller = null;
public NavigationView(ApplicationController controller){
setDefaults();
panel.add(tree);
tree.addSelectionHandler(this);
initWidget(panel);
this.controller = controller;
}
private void setDefaults(){
TreeItem root = new TreeItem("root");
root.addItem("item0");
root.addItem("item1");
root.addItem("item2");
TreeItem moreItems = new TreeItem("moreitems");
moreItems.addItem("moreitems1");
moreItems.addItem("moreitems2");
moreItems.addItem("moreitems3");
root.addItem(moreItems);
tree.addItem(root);
}
public void onSelection(SelectionEvent<TreeItem> event) {
TreeItem item = event.getSelectedItem();
if(item.getChildCount() == 0) {
controller.navigationChanged(item);
}
else {
item.setState(!item.getState());
// Window.alert(item.getState());
}
}
}
Tree.java
package de.jomawo.tree.client;
import com.google.gwt.core.client.EntryPoint;
public class Tree implements EntryPoint {
public void onModuleLoad() {
ApplicationController controller = new ApplicationController();
RootPanel.get().add(new NavigationView(controller));
}
}
ApplicationController.java
package de.jomawo.tree.client;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.TreeItem;
public class ApplicationController {
public void navigationChanged(TreeItem item){
Window.alert(item.getText());
}
}
On 12 Mai, 01:43, Sumit Chandel <[email protected]> wrote:
> Hi meandi,
> I couldn't reproduce the issue you described using the code snippet you
> provided (along with the setDefault() method implementation below.
>
> private void setDefaults(){
> // Building the tree ...
> TreeItem root = new TreeItem("root");
> root.addItem("item0");
> root.addItem("item1");
> root.addItem("item2");
>
> TreeItem moreItems = new TreeItem("moreitems");
> moreItems.addItem("moreitems1");
> moreItems.addItem("moreitems2");
> moreItems.addItem("moreitems3");
>
> root.addItem(moreItems);
> tree.addItem(root);
>
> }
>
> Could you provide more details about which browser you were using when you
> encountered this issue? As well as which type of widgets you were adding to
> the Tree when the double-fire error occurred?
>
> Cheers,
> -Sumit Chandel
>
> On Fri, May 8, 2009 at 3:12 AM, meandi <[email protected]> wrote:
>
> > Hi,
>
> > I defined an SelectionHandler to my tree, that will call a method of
> > my controller when the user clicks on a leaf. This part works fine. If
> > the user clicks on a node (with childs) the branch state (of folding)
> > should be changed.There encounters a problem: Clicking/Selecting a
> > leaf fires the event once, clicking on a folded (state false) node
> > fires the event once too. But if the branch is unfolded (state true)
> > the event is fired twice.
> > Is it an error in reasoning or does it still referres to the bug that
> > was fixed in Version 1.1.0?
>
> > I'm working with GWT Version 1.6.4
>
> > sourcecode looks like this:
>
> > public class NavigationView extends Composite implements
> > SelectionHandler<TreeItem> {
>
> > Panel panel = new VerticalPanel();
> > Tree tree = new Tree();
> > Navigation controller = new NavigationController();
>
> > public NavigationView(){
> > setDefaults();
> > panel.add(tree);
> > tree.addSelectionHandler(this);
> > initWidget(panel);
> > }
>
> > private void setDefaults(){
> > // Building the tree ...
> > }
>
> > public void onSelection(SelectionEvent<TreeItem> event) {
> > TreeItem item = event.getSelectedItem();
>
> > if(item.getChildCount() == 0) {
> > Window.alert(item.getText());
> > //controller.selectionChanged(item);
> > }
> > else {
> > item.setState(!item.getState());
> > }
> > }
> > }
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