com.google.gwt.user.client.ui.impl.FocusImpl Maven / Gradle / Ivy
/*
* 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.user.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);
}
}