| /* |
| * Copyright 2011 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.user.client.ui; |
| |
| import com.google.gwt.dom.client.Style.Unit; |
| import com.google.gwt.layout.client.Layout; |
| import com.google.gwt.layout.client.Layout.Layer; |
| |
| /** |
| * A simple panel that {@link ProvidesResize} to its one child. |
| */ |
| public class SimpleLayoutPanel extends SimplePanel implements RequiresResize, |
| ProvidesResize { |
| |
| private Layer layer; |
| private final Layout layout; |
| |
| public SimpleLayoutPanel() { |
| layout = new Layout(getElement()); |
| } |
| |
| @Override |
| public void onResize() { |
| if (widget instanceof RequiresResize) { |
| ((RequiresResize) widget).onResize(); |
| } |
| } |
| |
| @Override |
| public boolean remove(Widget w) { |
| // Validate. |
| if (widget != w) { |
| return false; |
| } |
| |
| // Orphan. |
| try { |
| orphan(w); |
| } finally { |
| // Physical detach. |
| layout.removeChild(layer); |
| layer = null; |
| |
| // Logical detach. |
| widget = null; |
| } |
| return true; |
| } |
| |
| @Override |
| public void setWidget(Widget w) { |
| // Validate |
| if (w == widget) { |
| return; |
| } |
| |
| // Detach new child. |
| if (w != null) { |
| w.removeFromParent(); |
| } |
| |
| // Remove old child. |
| if (widget != null) { |
| remove(widget); |
| } |
| |
| // Logical attach. |
| widget = w; |
| |
| if (w != null) { |
| // Physical attach. |
| layer = layout.attachChild(widget.getElement(), widget); |
| layer.setTopHeight(0.0, Unit.PX, 100.0, Unit.PCT); |
| layer.setLeftWidth(0.0, Unit.PX, 100.0, Unit.PCT); |
| |
| adopt(w); |
| |
| // Update the layout. |
| layout.layout(); |
| onResize(); |
| } |
| } |
| |
| @Override |
| protected void onAttach() { |
| super.onAttach(); |
| layout.onAttach(); |
| } |
| |
| @Override |
| protected void onDetach() { |
| super.onDetach(); |
| layout.onDetach(); |
| } |
| } |