Java tutorial
/* * 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.event.dom.client.BlurEvent; import com.google.gwt.event.dom.client.BlurHandler; import com.google.gwt.event.dom.client.FocusEvent; import com.google.gwt.event.dom.client.FocusHandler; import com.google.gwt.event.dom.client.HasBlurHandlers; import com.google.gwt.event.dom.client.HasFocusHandlers; import com.google.gwt.event.dom.client.HasKeyDownHandlers; import com.google.gwt.event.dom.client.HasKeyPressHandlers; import com.google.gwt.event.dom.client.KeyDownEvent; import com.google.gwt.event.dom.client.KeyDownHandler; import com.google.gwt.event.dom.client.KeyPressEvent; import com.google.gwt.event.dom.client.KeyPressHandler; import com.google.gwt.event.shared.HandlerRegistration; import com.google.gwt.user.client.ui.FlowPanel; import com.google.gwt.user.client.ui.impl.FocusImpl; import com.vaadin.client.Focusable; public class FocusableFlowPanel extends FlowPanel implements HasFocusHandlers, HasBlurHandlers, HasKeyDownHandlers, HasKeyPressHandlers, Focusable { /** * Constructor. */ public FocusableFlowPanel() { // make focusable, as we don't need access key magic we don't need to // use FocusImpl.createFocusable getElement().setTabIndex(0); } /* * (non-Javadoc) * * @see * com.google.gwt.event.dom.client.HasFocusHandlers#addFocusHandler(com. * google.gwt.event.dom.client.FocusHandler) */ @Override public HandlerRegistration addFocusHandler(FocusHandler handler) { return addDomHandler(handler, FocusEvent.getType()); } /* * (non-Javadoc) * * @see * com.google.gwt.event.dom.client.HasBlurHandlers#addBlurHandler(com.google * .gwt.event.dom.client.BlurHandler) */ @Override public HandlerRegistration addBlurHandler(BlurHandler handler) { return addDomHandler(handler, BlurEvent.getType()); } /* * (non-Javadoc) * * @see * com.google.gwt.event.dom.client.HasKeyDownHandlers#addKeyDownHandler( * com.google.gwt.event.dom.client.KeyDownHandler) */ @Override public HandlerRegistration addKeyDownHandler(KeyDownHandler handler) { return addDomHandler(handler, KeyDownEvent.getType()); } /* * (non-Javadoc) * * @see * com.google.gwt.event.dom.client.HasKeyPressHandlers#addKeyPressHandler * (com.google.gwt.event.dom.client.KeyPressHandler) */ @Override public HandlerRegistration addKeyPressHandler(KeyPressHandler handler) { return addDomHandler(handler, KeyPressEvent.getType()); } /** * Sets/Removes the keyboard focus to the panel. * * @param focus * If set to true then the focus is moved to the panel, if set to * false the focus is removed */ public void setFocus(boolean focus) { if (focus) { FocusImpl.getFocusImplForPanel().focus(getElement()); } else { FocusImpl.getFocusImplForPanel().blur(getElement()); } } /** * Focus the panel. */ @Override public void focus() { setFocus(true); } }