user/javadoc/com/google/gwt/examples/DockLayoutPanelExample.java

/*
 * Copyright 2009 Google Inc.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.google.gwt.examples;

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.dom.client.Style.Unit;
import com.google.gwt.user.client.ui.DockLayoutPanel;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.RootLayoutPanel;

public class DockLayoutPanelExample implements EntryPoint {

  public void onModuleLoad() {
    // Attach five widgets to a DockLayoutPanel, one in each direction. Lay
    // them out in 'em' units.
    DockLayoutPanel p = new DockLayoutPanel(Unit.EM);
    p.addNorth(new HTML("north"), 2);
    p.addSouth(new HTML("south"), 2);
    p.addEast(new HTML("east"), 2);
    p.addWest(new HTML("west"), 2);
    p.add(new HTML("center"));

    // Note the explicit call to layout(). This is required for the layout to
    // take effect.
    p.layout();

    // Attach the LayoutPanel to the RootLayoutPanel. The latter will listen for
    // resize events on the window to ensure that its children are informed of
    // possible size changes.
    RootLayoutPanel rp = RootLayoutPanel.get();
    rp.add(p);

    // The RootLayoutPanel also requires that its layout() method be explicitly
    // called for the initial layout to take effect.
    rp.layout();
  }
}