| /* |
| * Copyright 2006 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.impl; |
| |
| import com.google.gwt.core.client.GWT; |
| import com.google.gwt.dom.client.Document; |
| import com.google.gwt.dom.client.Element; |
| |
| /** |
| * Implementation interface for creating and manipulating focusable elements |
| * that aren't naturally focusable in all browsers, such as DIVs. |
| */ |
| public class FocusImpl { |
| |
| private static FocusImpl implPanel = GWT.create(FocusImpl.class); |
| |
| /** |
| * This instance may not be a {@link FocusImplStandard}, because that special |
| * case is only needed for things that aren't naturally focusable on some |
| * browsers, such as DIVs. This exact class works for truly focusable widgets |
| * on those browsers. |
| * |
| * The compiler will optimize out the conditional. |
| */ |
| private static FocusImpl implWidget = (implPanel instanceof FocusImplStandard) |
| ? new FocusImpl() : implPanel; |
| |
| /** |
| * Returns the focus implementation class for creating and manipulating |
| * focusable elements that aren't naturally focusable in all browsers, such as |
| * DIVs. |
| */ |
| public static FocusImpl getFocusImplForPanel() { |
| return implPanel; |
| } |
| |
| /** |
| * Returns the focus implementation class for manipulating focusable elements |
| * that are naturally focusable in all browsers, such as text boxes. |
| */ |
| public static FocusImpl getFocusImplForWidget() { |
| return implWidget; |
| } |
| |
| /** |
| * Not externally instantiable or extensible. |
| */ |
| FocusImpl() { |
| } |
| |
| public void blur(Element elem) { |
| elem.blur(); |
| } |
| |
| public Element createFocusable() { |
| Element e = Document.get().createDivElement().cast(); |
| e.setTabIndex(0); |
| return e; |
| } |
| |
| public void focus(Element elem) { |
| elem.focus(); |
| } |
| |
| public int getTabIndex(Element elem) { |
| return elem.getTabIndex(); |
| } |
| |
| public native void setAccessKey(Element elem, char key) /*-{ |
| elem.accessKey = String.fromCharCode(key); |
| }-*/; |
| |
| public void setTabIndex(Element elem, int index) { |
| elem.setTabIndex(index); |
| } |
| } |