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- /*
- * Copyright 2000-2018 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.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(focusElement, 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(focusElement);
- } else {
- FocusImpl.getFocusImplForPanel().blur(focusElement);
- }
- }
-
- @Override
- public void setTabIndex(int tabIndex) {
- getElement().setTabIndex(-1);
- if (focusElement != null) {
- focusElement.setTabIndex(tabIndex);
- }
- }
-
- /**
- * @return the focus element
- */
- public com.google.gwt.user.client.Element getFocusElement() {
- return focusElement.cast();
- }
- }
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