/*
* Copyright (c) 2003, 2005, 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.
*/
/**
* This class is a placeholder for all internal static objects that represent
* system state. We keep our representation up-to-date with actual system
* state by tracking events, such as X Focus, Component under cursor etc.
* All attributes should be private static with accessors to simpify change
* tracking.
*/
package sun.awt.X11;
import java.awt.Component;
import java.lang.ref.WeakReference;
class XAwtState {
/**
* The mouse is over this component.
* If the component is not disabled, it received MOUSE_ENTERED but no MOUSE_EXITED.
*/
private static WeakReference<Component> componentMouseEnteredRef = null;
static void setComponentMouseEntered(Component component) {
XToolkit.awtLock();
try {
if (component == null) {
componentMouseEnteredRef = null;
return;
}
if (component != getComponentMouseEntered()) {
componentMouseEnteredRef = new WeakReference<>(component);
}
} finally {
XToolkit.awtUnlock();
}
}
static Component getComponentMouseEntered() {
XToolkit.awtLock();
try {
if (componentMouseEnteredRef == null) {
return null;
}
return componentMouseEnteredRef.get();
} finally {
XToolkit.awtUnlock();
}
}
/**
* The XBaseWindow is created with OwnerGrabButtonMask
* (see X vol. 1, 8.3.3.2) so inside the app Key, Motion, and Button events
* are received by the window they actualy happened on, not the grabber.
* Then XBaseWindow dispatches them to the grabber. As a result
* XAnyEvent.get_window() returns actual window the event is originated,
* though the event is dispatched by the grabber.
*/
private static boolean inManualGrab = false;
static boolean isManualGrab() {
return inManualGrab;
}
private static WeakReference<XBaseWindow> grabWindowRef = null;
/**
* The X Active Grab overrides any other active grab by the same
* client see XGrabPointer, XGrabKeyboard
*/
static void setGrabWindow(XBaseWindow grabWindow) {
setGrabWindow(grabWindow, false);
}
/**
* Automatic passive grab doesn't override active grab see XGrabButton
*/
static void setAutoGrabWindow(XBaseWindow grabWindow) {
setGrabWindow(grabWindow, true);
}
private static void setGrabWindow(XBaseWindow grabWindow, boolean isAutoGrab) {
XToolkit.awtLock();
try {
if (inManualGrab && isAutoGrab) {
return;
}
inManualGrab = grabWindow != null && !isAutoGrab;
if (grabWindow == null) {
grabWindowRef = null;
return;
}
if (grabWindow != getGrabWindow()) {
grabWindowRef = new WeakReference<>(grabWindow);
}
} finally {
XToolkit.awtUnlock();
}
}
static XBaseWindow getGrabWindow() {
/**代码未完, 请加载全部代码(NowJava.com).**/