[CLOSED] BorderLayout problem with nested panels

juergen · **Joined:** Thu Mar 13, 2008 5:38 pm **Posts:** 28

Hi,
the following code:

Code:

public void onModuleLoad() {
  Panel mainPanel = new Panel();
  mainPanel.setLayout( new BorderLayout() ); 
  Panel nestedPanel = new Panel();
  nestedPanel.setLayout( new BorderLayout() );
  mainPanel.add( nestedPanel, new BorderLayoutData( RegionPosition.CENTER ) );
  new Viewport( mainPanel );
}

produces the following error:

com.google.gwt.dev.shell.HostedModeException: invokeNativeHandle(@com.gwtext.client.widgets.Viewport::create(Lcom/google/gwt/core/client/JavaScriptObject;)): JavaScript undefined, expected com.google.gwt.core.client.JavaScriptObject
at com.google.gwt.dev.shell.JsValueGlue.get(JsValueGlue.java:101)
at com.google.gwt.dev.shell.ModuleSpace.invokeNativeHandle(ModuleSpace.java:226)
at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeHandle(JavaScriptHost.java:89)
at com.gwtext.client.widgets.Viewport.create(Viewport.java:65)
at com.gwtext.client.widgets.Viewport.<init>(Viewport.java:46)
at com.cubusmail.gwtui.client.Cubusmail.onModuleLoad(Cubusmail.java:60)
at com.google.gwt.dev.shell.ModuleSpace.onLoad(ModuleSpace.java:342)
at com.google.gwt.dev.shell.BrowserWidget.attachModuleSpace(BrowserWidget.java:326)
at com.google.gwt.dev.shell.ie.BrowserWidgetIE6.access$200(BrowserWidgetIE6.java:36)
at com.google.gwt.dev.shell.ie.BrowserWidgetIE6$External.gwtOnLoad(BrowserWidgetIE6.java:70)

If the nested panel has an other layout, it works. What is the problem? Any help would be appreciated.

Thanks

Regards,
Jürgen

sjivan · **Joined:** Fri Dec 14, 2007 12:27 pm **Posts:** 1017

Hi Jurgen,
When using a BorderLayout, you must have a Panel assigned to the CENTER region at the very minimum. This is a requirement.

I've added this to the BorderLayout javadocs

Note that when using BorderLayout, you must have a Panel assigned to the CENTER region.

So try this

Code:

    public void onModuleLoad() {
        Panel mainPanel = new Panel();
        mainPanel.setLayout(new BorderLayout());
        Panel nestedPanel = new Panel();
        nestedPanel.setLayout(new BorderLayout());

        //add a center panel to the nested panel
        nestedPanel.add(new Panel("Inner"), new BorderLayoutData(RegionPosition.CENTER));

        mainPanel.add(nestedPanel, new BorderLayoutData(RegionPosition.CENTER));
        new Viewport(mainPanel);
    }

Sanjiv

juergen · **Joined:** Thu Mar 13, 2008 5:38 pm **Posts:** 28

Hi Sanjiv,
thanks a lot for the quick help. It works. Great support for a great tool kit.

Jürgen

[CLOSED] BorderLayout problem with nested panels

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