Java tutorial
/* * Copyright 2011 JBoss 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 org.jbpm.form.builder.ng.model.common.handler; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import com.google.gwt.event.dom.client.BlurEvent; import com.google.gwt.event.dom.client.BlurHandler; import com.google.gwt.event.dom.client.ClickEvent; import com.google.gwt.event.dom.client.FocusEvent; import com.google.gwt.event.dom.client.FocusHandler; import com.google.gwt.event.shared.HandlerRegistration; import com.google.gwt.user.client.DOM; import com.google.gwt.user.client.Event; import com.google.gwt.user.client.ui.Widget; public class EventHelper { private static final Map<Widget, List<RightClickHandler>> RCLICK_HANDLERS = new HashMap<Widget, List<RightClickHandler>>(); private static final Map<Widget, List<ControlKeyHandler>> KCUT_HANDLERS = new HashMap<Widget, List<ControlKeyHandler>>(); private static final Map<Widget, List<ControlKeyHandler>> KCOPY_HANDLERS = new HashMap<Widget, List<ControlKeyHandler>>(); private static final Map<Widget, List<ControlKeyHandler>> KPASTE_HANDLERS = new HashMap<Widget, List<ControlKeyHandler>>(); private static final Map<Widget, List<BlurHandler>> BLUR_HANDLERS = new HashMap<Widget, List<BlurHandler>>(); private static final Map<Widget, List<FocusHandler>> FOCUS_HANDLERS = new HashMap<Widget, List<FocusHandler>>(); public static HandlerRegistration addBlurHandler(Widget widget, final BlurHandler handler) { widget.sinkEvents(Event.ONBLUR); List<BlurHandler> handlers = BLUR_HANDLERS.get(widget); if (handlers == null) { handlers = new ArrayList<BlurHandler>(); BLUR_HANDLERS.put(widget, handlers); } handlers.add(handler); final List<BlurHandler> _handlers = handlers; return new HandlerRegistration() { @Override public void removeHandler() { _handlers.remove(handler); } }; } public static HandlerRegistration addFocusHandler(Widget widget, final FocusHandler handler) { widget.sinkEvents(Event.ONFOCUS); List<FocusHandler> handlers = FOCUS_HANDLERS.get(widget); if (handlers == null) { handlers = new ArrayList<FocusHandler>(); FOCUS_HANDLERS.put(widget, handlers); } handlers.add(handler); final List<FocusHandler> _handlers = handlers; return new HandlerRegistration() { @Override public void removeHandler() { _handlers.remove(handler); } }; } public static HandlerRegistration addRightClickHandler(Widget widget, final RightClickHandler handler) { widget.sinkEvents(Event.ONMOUSEUP | Event.ONDBLCLICK | Event.ONCONTEXTMENU); List<RightClickHandler> handlers = RCLICK_HANDLERS.get(widget); if (handlers == null) { handlers = new ArrayList<RightClickHandler>(); RCLICK_HANDLERS.put(widget, handlers); } handlers.add(handler); final List<RightClickHandler> _handlers = handlers; return new HandlerRegistration() { @Override public void removeHandler() { _handlers.remove(handler); } }; } public static HandlerRegistration addKeyboardPasteHandler(Widget widget, final ControlKeyHandler handler) { widget.sinkEvents(Event.ONKEYPRESS); List<ControlKeyHandler> handlers = KPASTE_HANDLERS.get(widget); if (handlers == null) { handlers = new ArrayList<ControlKeyHandler>(); KPASTE_HANDLERS.put(widget, handlers); } handlers.add(handler); final List<ControlKeyHandler> _handlers = handlers; return new HandlerRegistration() { @Override public void removeHandler() { _handlers.remove(handler); } }; } public static HandlerRegistration addKeyboardCutHandler(Widget widget, final ControlKeyHandler handler) { widget.sinkEvents(Event.ONKEYPRESS); List<ControlKeyHandler> handlers = KCUT_HANDLERS.get(widget); if (handlers == null) { handlers = new ArrayList<ControlKeyHandler>(); KCUT_HANDLERS.put(widget, handlers); } handlers.add(handler); final List<ControlKeyHandler> _handlers = handlers; return new HandlerRegistration() { @Override public void removeHandler() { _handlers.remove(handler); } }; } public static HandlerRegistration addKeyboardCopyHandler(Widget widget, final ControlKeyHandler handler) { widget.sinkEvents(Event.ONKEYPRESS); List<ControlKeyHandler> handlers = KCOPY_HANDLERS.get(widget); if (handlers == null) { handlers = new ArrayList<ControlKeyHandler>(); KCOPY_HANDLERS.put(widget, handlers); } handlers.add(handler); final List<ControlKeyHandler> _handlers = handlers; return new HandlerRegistration() { @Override public void removeHandler() { _handlers.remove(handler); } }; } public static void onBrowserEvent(final Widget widget, Event event) { switch (DOM.eventGetType(event)) { case Event.ONMOUSEUP: case Event.ONDBLCLICK: case Event.ONCONTEXTMENU: onRightClickEvent(widget, event); break; case Event.ONKEYPRESS: onKeyEvent(widget, event); break; case Event.ONBLUR: onBlurEvent(widget, event); case Event.ONFOCUS: onFocusEvent(widget, event); default: //Do nothing }//end switch } protected static void onBlurEvent(final Widget widget, Event event) { BlurEvent bevent = new BlurEvent() { @Override public Object getSource() { return widget; } }; bevent.setNativeEvent(event); List<BlurHandler> handlers = BLUR_HANDLERS.get(widget); if (handlers != null) { for (BlurHandler handler : handlers) { handler.onBlur(bevent); } } } protected static void onFocusEvent(final Widget widget, Event event) { FocusEvent fevent = new FocusEvent() { @Override public Object getSource() { return widget; } }; fevent.setNativeEvent(event); List<FocusHandler> handlers = FOCUS_HANDLERS.get(widget); if (handlers != null) { for (FocusHandler handler : handlers) { handler.onFocus(fevent); } } } protected static void onRightClickEvent(final Widget widget, Event event) { switch (DOM.eventGetType(event)) { case Event.ONMOUSEUP: event.stopPropagation(); event.preventDefault(); if (DOM.eventGetButton(event) == Event.BUTTON_LEFT) { ClickEvent cevent = new ClickEvent() { @Override public Object getSource() { return widget; } }; cevent.setNativeEvent(event); widget.fireEvent(cevent); } else if (DOM.eventGetButton(event) == Event.BUTTON_RIGHT) { List<RightClickHandler> rclickHandlers = RCLICK_HANDLERS.get(widget); if (rclickHandlers != null) { RightClickEvent rcevent = new RightClickEvent(event); for (RightClickHandler handler : rclickHandlers) { handler.onRightClick(rcevent); } } } break; case Event.ONDBLCLICK: event.stopPropagation(); event.preventDefault(); break; case Event.ONCONTEXTMENU: event.stopPropagation(); event.preventDefault(); break; default: //Do nothing }//end switch } protected static void onKeyEvent(Widget widget, Event event) { List<ControlKeyHandler> handlers = null; switch (DOM.eventGetType(event)) { case Event.ONKEYPRESS: if (event.getCtrlKey()) { switch (event.getCharCode()) { case 'c': case 'C': //copy event.stopPropagation(); event.preventDefault(); handlers = KCOPY_HANDLERS.get(widget); break; case 'x': case 'X': //cut event.stopPropagation(); event.preventDefault(); handlers = KCUT_HANDLERS.get(widget); break; case 'v': case 'V': //paste event.stopPropagation(); event.preventDefault(); handlers = KPASTE_HANDLERS.get(widget); break; default: //Do nothing } } break; default: //Do nothing }//end switch if (handlers != null) { for (ControlKeyHandler handler : handlers) { handler.onKeyboardControl(); } } } }