| /* |
| * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.lwawt; |
| |
| import java.awt.Component; |
| import java.awt.Container; |
| import java.awt.Cursor; |
| import java.awt.Point; |
| |
| import java.util.concurrent.atomic.AtomicBoolean; |
| |
| import sun.awt.AWTAccessor; |
| import sun.awt.SunToolkit; |
| |
| public abstract class LWCursorManager { |
| |
| /** |
| * A flag to indicate if the update is scheduled, so we don't process it |
| * twice. |
| */ |
| private final AtomicBoolean updatePending = new AtomicBoolean(false); |
| |
| protected LWCursorManager() { |
| } |
| |
| /** |
| * Sets the cursor to correspond the component currently under mouse. |
| * |
| * This method should not be executed on the toolkit thread as it |
| * calls to user code (e.g. Container.findComponentAt). |
| */ |
| public final void updateCursor() { |
| updatePending.set(false); |
| updateCursorImpl(); |
| } |
| |
| /** |
| * Schedules updating the cursor on the corresponding event dispatch |
| * thread for the given window. |
| * |
| * This method is called on the toolkit thread as a result of a |
| * native update cursor request (e.g. WM_SETCURSOR on Windows). |
| */ |
| public final void updateCursorLater(final LWWindowPeer window) { |
| if (updatePending.compareAndSet(false, true)) { |
| Runnable r = new Runnable() { |
| @Override |
| public void run() { |
| updateCursor(); |
| } |
| }; |
| SunToolkit.executeOnEventHandlerThread(window.getTarget(), r); |
| } |
| } |
| |
| private void updateCursorImpl() { |
| final Point cursorPos = getCursorPosition(); |
| final Component c = findComponent(cursorPos); |
| final Cursor cursor; |
| final Object peer = LWToolkit.targetToPeer(c); |
| if (peer instanceof LWComponentPeer) { |
| final LWComponentPeer<?, ?> lwpeer = (LWComponentPeer<?, ?>) peer; |
| final Point p = lwpeer.getLocationOnScreen(); |
| cursor = lwpeer.getCursor(new Point(cursorPos.x - p.x, |
| cursorPos.y - p.y)); |
| } else { |
| cursor = (c != null) ? c.getCursor() : null; |
| } |
| setCursor(cursor); |
| } |
| |
| /** |
| * Returns the first visible, enabled and showing component under cursor. |
| * Returns null for modal blocked windows. |
| * |
| * @param cursorPos Current cursor position. |
| * @return Component or null. |
| */ |
| private static final Component findComponent(final Point cursorPos) { |
| final LWComponentPeer<?, ?> peer = LWWindowPeer.getPeerUnderCursor(); |
| Component c = null; |
| if (peer != null && peer.getWindowPeerOrSelf().getBlocker() == null) { |
| c = peer.getTarget(); |
| if (c instanceof Container) { |
| final Point p = peer.getLocationOnScreen(); |
| c = AWTAccessor.getContainerAccessor().findComponentAt( |
| (Container) c, cursorPos.x - p.x, cursorPos.y - p.y, false); |
| |
| } |
| while (c != null) { |
| final Object p = AWTAccessor.getComponentAccessor().getPeer(c); |
| if (c.isVisible() && c.isEnabled() && p != null) { |
| break; |
| } |
| c = c.getParent(); |
| } |
| } |
| return c; |
| } |
| |
| /** |
| * Returns the current cursor position. |
| */ |
| // TODO: make it public to reuse for MouseInfo |
| protected abstract Point getCursorPosition(); |
| |
| /** |
| * Sets a cursor. The cursor can be null if the mouse is not over a Java |
| * window. |
| * @param cursor the new {@code Cursor}. |
| */ |
| protected abstract void setCursor(Cursor cursor); |
| } |