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/*
* Copyright 2011 Vaadin Ltd.
*
* 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.vaadin.client.ui;
import com.google.gwt.dom.client.DivElement;
import com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.Style;
import com.google.gwt.dom.client.Style.Position;
import com.google.gwt.dom.client.Style.Unit;
import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.Element;
import com.google.gwt.user.client.Event;
import com.google.gwt.user.client.ui.Widget;
import com.google.gwt.user.client.ui.impl.FocusImpl;
/**
* A panel that contains an always visible 0x0 size element that holds the focus
*/
public class FocusElementPanel extends SimpleFocusablePanel {
private DivElement focusElement;
public FocusElementPanel() {
focusElement = Document.get().createDivElement();
}
@Override
public void setWidget(Widget w) {
super.setWidget(w);
if (focusElement.getParentElement() == null) {
Style style = focusElement.getStyle();
style.setPosition(Position.FIXED);
style.setTop(0, Unit.PX);
style.setLeft(0, Unit.PX);
getElement().appendChild(focusElement);
/* Sink from focusElement too as focus and blur don't bubble */
DOM.sinkEvents(
(com.google.gwt.user.client.Element) focusElement.cast(),
Event.FOCUSEVENTS);
// revert to original, not focusable
getElement().setPropertyObject("tabIndex", null);
} else {
moveFocusElementAfterWidget();
}
}
/**
* Helper to keep focus element always in domChild[1]. Aids testing.
*/
private void moveFocusElementAfterWidget() {
getElement().insertAfter(focusElement, getWidget().getElement());
}
@Override
public void setFocus(boolean focus) {
if (focus) {
FocusImpl.getFocusImplForPanel().focus(
(Element) focusElement.cast());
} else {
FocusImpl.getFocusImplForPanel()
.blur((Element) focusElement.cast());
}
}
@Override
public void setTabIndex(int tabIndex) {
getElement().setTabIndex(-1);
if (focusElement != null) {
focusElement.setTabIndex(tabIndex);
}
}
/**
* @return the focus element
*/
public Element getFocusElement() {
return focusElement.cast();
}
}
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