Java tutorial
/* * Copyright 2008 Jeff Dwyer * * 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.apress.progwt.client.college.gui.ext; import com.google.gwt.user.client.DOM; import com.google.gwt.user.client.Event; import com.google.gwt.user.client.Timer; import com.google.gwt.user.client.ui.ClickListener; import com.google.gwt.user.client.ui.ClickListenerCollection; import com.google.gwt.user.client.ui.FocusListener; import com.google.gwt.user.client.ui.FocusListenerCollection; import com.google.gwt.user.client.ui.HasFocus; import com.google.gwt.user.client.ui.KeyboardListener; import com.google.gwt.user.client.ui.KeyboardListenerCollection; import com.google.gwt.user.client.ui.MouseListener; import com.google.gwt.user.client.ui.MouseListenerCollection; import com.google.gwt.user.client.ui.MouseWheelListener; import com.google.gwt.user.client.ui.MouseWheelListenerCollection; import com.google.gwt.user.client.ui.SimplePanel; import com.google.gwt.user.client.ui.SourcesClickEvents; import com.google.gwt.user.client.ui.SourcesMouseEvents; import com.google.gwt.user.client.ui.SourcesMouseWheelEvents; import com.google.gwt.user.client.ui.Widget; import com.google.gwt.user.client.ui.impl.FocusImpl; /** * FocusPanel gives us no good way to see if the ctrl key was down, or do * double clicks. * * * Stores the ctrl key for before the event goes by and delays clickEvents * until we're sure it's not a double click before dispatching. * * TODO click stuff can be replaced because 1.4RC2 should have * DOM.eventGetCurrentEvent() * * @author Jeff Dwyer * */ public class FocusPanelExt extends SimplePanel implements HasFocus, SourcesClickEvents, SourcesMouseEvents, SourcesMouseWheelEvents { private static final int DBL_CLICK_DELAY = 250; static final FocusImpl impl = FocusImpl.getFocusImplForPanel(); private ClickListenerCollection clickListeners; private Timer delayedclickFirer; private DblClickListenerCollection doubleClickLisenerCollection; private FocusListenerCollection focusListeners; private KeyboardListenerCollection keyboardListeners; private boolean lastClickEventCtrl; private MouseListenerCollection mouseListeners; private MouseWheelListenerCollection mouseWheelListeners; private int lastClickClientX; private int lastClickClientY; public FocusPanelExt() { super(impl.createFocusable()); sinkEvents(Event.FOCUSEVENTS | Event.KEYEVENTS | Event.ONCLICK | Event.MOUSEEVENTS | Event.ONMOUSEWHEEL | Event.ONDBLCLICK); delayedclickFirer = new Timer() { public void run() { // Log.debug("DELAYED CLICK FIRE"); clickListeners.fireClick(FocusPanelExt.this); } }; } public FocusPanelExt(Widget child) { this(); setWidget(child); } public void addClickListener(ClickListener listener) { if (clickListeners == null) { clickListeners = new ClickListenerCollection(); } clickListeners.add(listener); } public void addDblClickListener(DblClickListener listener) { if (doubleClickLisenerCollection == null) { doubleClickLisenerCollection = new DblClickListenerCollection(); } doubleClickLisenerCollection.add(listener); } public void addFocusListener(FocusListener listener) { if (focusListeners == null) { focusListeners = new FocusListenerCollection(); } focusListeners.add(listener); } public void addKeyboardListener(KeyboardListener listener) { if (keyboardListeners == null) { keyboardListeners = new KeyboardListenerCollection(); } keyboardListeners.add(listener); } public void addMouseListener(MouseListener listener) { if (mouseListeners == null) { mouseListeners = new MouseListenerCollection(); } mouseListeners.add(listener); } public void addMouseWheelListener(MouseWheelListener listener) { if (mouseWheelListeners == null) { mouseWheelListeners = new MouseWheelListenerCollection(); } mouseWheelListeners.add(listener); } public boolean getLastClickEventCtrl() { return lastClickEventCtrl; } public int getTabIndex() { return impl.getTabIndex(getElement()); } public void onBrowserEvent(Event event) { switch (DOM.eventGetType(event)) { case Event.ONCLICK: lastClickEventCtrl = DOM.eventGetCtrlKey(event); lastClickClientX = DOM.eventGetClientX(event); lastClickClientY = DOM.eventGetClientY(event); if (clickListeners != null) { // Log.debug("DELAYED CLICK SCHEDULE"); delayedclickFirer.schedule(DBL_CLICK_DELAY); } break; case Event.ONMOUSEDOWN: case Event.ONMOUSEUP: case Event.ONMOUSEMOVE: case Event.ONMOUSEOVER: case Event.ONMOUSEOUT: if (mouseListeners != null) { mouseListeners.fireMouseEvent(this, event); } break; case Event.ONDBLCLICK: if (doubleClickLisenerCollection != null) { delayedclickFirer.cancel(); // Log.debug("DELAYED CLICK CANCEL ON DOUBLE"); doubleClickLisenerCollection.fireDoubleClick(this); } break; case Event.ONMOUSEWHEEL: if (mouseWheelListeners != null) { mouseWheelListeners.fireMouseWheelEvent(this, event); } break; case Event.ONBLUR: case Event.ONFOCUS: if (focusListeners != null) { focusListeners.fireFocusEvent(this, event); } break; case Event.ONKEYDOWN: case Event.ONKEYUP: case Event.ONKEYPRESS: if (keyboardListeners != null) { keyboardListeners.fireKeyboardEvent(this, event); } break; } // lastClickEvent = null; } public int getLastClickClientX() { return lastClickClientX; } public int getLastClickClientY() { return lastClickClientY; } public void removeClickListener(ClickListener listener) { if (clickListeners != null) { clickListeners.remove(listener); } } public void removeFocusListener(FocusListener listener) { if (focusListeners != null) { focusListeners.remove(listener); } } public void removeKeyboardListener(KeyboardListener listener) { if (keyboardListeners != null) { keyboardListeners.remove(listener); } } public void removeMouseListener(MouseListener listener) { if (mouseListeners != null) { mouseListeners.remove(listener); } } public void removeMouseWheelListener(MouseWheelListener listener) { if (mouseWheelListeners != null) { mouseWheelListeners.remove(listener); } } public void setAccessKey(char key) { impl.setAccessKey(getElement(), key); } public void setFocus(boolean focused) { if (focused) { impl.focus(getElement()); } else { impl.blur(getElement()); } } public void setTabIndex(int index) { impl.setTabIndex(getElement(), index); } }