捕捉苹果Command+Q 及 菜单栏 退出事件

tags: JAVA SWING 苹果 MAC Command+Q

Java Swing 在苹果上开发时经常要符合苹果用户习惯，增强用户体验。

类似于Alt+F4 苹果上 常使用Command+Q 退出，

此外菜单栏上苹果图标旁会有每个软件的一个总菜单，包括 【关于】【隐藏】。。【退出】等选项。

现在就来说说，怎么处理这两个事件以便完成退出时保存的功能。

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苹果官方针对一些常用的窗体事件做了一个扩展：OSXAdapter

官方范例及API:http://developer.apple.com/library/mac/#samplecode/OSXAdapter/Introduction/Intro.html

                                    http://developer.apple.com/library/mac/#documentation/Java/Reference/1.5.0/appledoc/api/com/apple/eawt/ApplicationListener.html

这里我们要用到setQuitHandler方法，在窗体的构造函数中为其指定退出事件。

OSXAdapter里都是一些静态事件，可以直接使用。参看下例

public void registerForMacOSXEvents() {if (osType == OS_MAC) {try {// Generate and register the OSXAdapterOSXAdapter.setQuitHandler(this, getClass().getDeclaredMethod("quit", (Class[]) null));} catch (Exception e) {System.err.println("Error while loading the OSXAdapter:");e.printStackTrace();}exitMenuItem.setVisible(false);}}

在try{}里，只需要指定原有的quit()方法。一句话即可搞定。

另外，苹果软件【退出】都在总菜单上，为了更亲切，我们要把原有【文件】下的【退出】设置成非表示。

到此为止，欢迎大家指正。（此文参考了：http://stackoverflow.com/questions/2061194/swing-on-osx-how-to-trap-command-q）

附上OSXAdapter代码

/*File: OSXAdapter.javaAbstract: Hooks existing preferences/about/quit functionality from an    existing Java app into handlers for the Mac OS X application menu.    Uses a Proxy object to dynamically implement the     com.apple.eawt.ApplicationListener interface and register it with the    com.apple.eawt.Application object.  This allows the complete project    to be both built and run on any platform without any stubs or     placeholders. Useful for developers looking to implement Mac OS X     features while supporting multiple platforms with minimal impact.Version: 2.0Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple Inc. ("Apple") in consideration of your agreement to thefollowing terms, and your use, installation, modification orredistribution of this Apple software constitutes acceptance of theseterms.  If you do not agree with these terms, please do not use,install, modify or redistribute this Apple software.In consideration of your agreement to abide by the following terms, andsubject to these terms, Apple grants you a personal, non-exclusivelicense, under Apple's copyrights in this original Apple software (the"Apple Software"), to use, reproduce, modify and redistribute the AppleSoftware, with or without modifications, in source and/or binary forms;provided that if you redistribute the Apple Software in its entirety andwithout modifications, you must retain this notice and the followingtext and disclaimers in all such redistributions of the Apple Software. Neither the name, trademarks, service marks or logos of Apple Inc. may be used to endorse or promote products derived from the AppleSoftware without specific prior written permission from Apple.  Exceptas expressly stated in this notice, no other rights or licenses, expressor implied, are granted by Apple herein, including but not limited toany patent rights that may be infringed by your derivative works or byother works in which the Apple Software may be incorporated.The Apple Software is provided by Apple on an "AS IS" basis.  APPLEMAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATIONTHE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESSFOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE ANDOPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTALOR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OFSUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESSINTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSEDAND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THEPOSSIBILITY OF SUCH DAMAGE.Copyright ｩ 2003-2007 Apple, Inc., All Rights Reserved*/package apple.dts.samplecode.osxadapter;import java.lang.reflect.*;import java.util.HashMap;public class OSXAdapter implements InvocationHandler {    protected Object targetObject;    protected Method targetMethod;    protected String proxySignature;        static Object macOSXApplication;    // Pass this method an Object and Method equipped to perform application shutdown logic    // The method passed should return a boolean stating whether or not the quit should occur    public static void setQuitHandler(Object target, Method quitHandler) {        setHandler(new OSXAdapter("handleQuit", target, quitHandler));    }        // Pass this method an Object and Method equipped to display application info    // They will be called when the About menu item is selected from the application menu    public static void setAboutHandler(Object target, Method aboutHandler) {        boolean enableAboutMenu = (target != null && aboutHandler != null);        if (enableAboutMenu) {            setHandler(new OSXAdapter("handleAbout", target, aboutHandler));        }        // If we're setting a handler, enable the About menu item by calling        // com.apple.eawt.Application reflectively        try {            Method enableAboutMethod = macOSXApplication.getClass().getDeclaredMethod("setEnabledAboutMenu", new Class[] { boolean.class });            enableAboutMethod.invoke(macOSXApplication, new Object[] { Boolean.valueOf(enableAboutMenu) });        } catch (Exception ex) {            System.err.println("OSXAdapter could not access the About Menu");            ex.printStackTrace();        }    }        // Pass this method an Object and a Method equipped to display application options    // They will be called when the Preferences menu item is selected from the application menu    public static void setPreferencesHandler(Object target, Method prefsHandler) {        boolean enablePrefsMenu = (target != null && prefsHandler != null);        if (enablePrefsMenu) {            setHandler(new OSXAdapter("handlePreferences", target, prefsHandler));        }        // If we're setting a handler, enable the Preferences menu item by calling        // com.apple.eawt.Application reflectively        try {            Method enablePrefsMethod = macOSXApplication.getClass().getDeclaredMethod("setEnabledPreferencesMenu", new Class[] { boolean.class });            enablePrefsMethod.invoke(macOSXApplication, new Object[] { Boolean.valueOf(enablePrefsMenu) });        } catch (Exception ex) {            System.err.println("OSXAdapter could not access the About Menu");            ex.printStackTrace();        }    }        // Pass this method an Object and a Method equipped to handle document events from the Finder    // Documents are registered with the Finder via the CFBundleDocumentTypes dictionary in the     // application bundle's Info.plist    public static void setFileHandler(Object target, Method fileHandler) {        setHandler(new OSXAdapter("handleOpenFile", target, fileHandler) {            // Override OSXAdapter.callTarget to send information on the            // file to be opened            public boolean callTarget(Object appleEvent) {                if (appleEvent != null) {                    try {                        Method getFilenameMethod = appleEvent.getClass().getDeclaredMethod("getFilename", (Class[])null);                        String filename = (String) getFilenameMethod.invoke(appleEvent, (Object[])null);                        this.targetMethod.invoke(this.targetObject, new Object[] { filename });                    } catch (Exception ex) {                                            }                }                return true;            }        });    }        // setHandler creates a Proxy object from the passed OSXAdapter and adds it as an ApplicationListener    public static void setHandler(OSXAdapter adapter) {        try {            Class applicationClass = Class.forName("com.apple.eawt.Application");            if (macOSXApplication == null) {                macOSXApplication = applicationClass.getConstructor((Class[])null).newInstance((Object[])null);            }            Class applicationListenerClass = Class.forName("com.apple.eawt.ApplicationListener");            Method addListenerMethod = applicationClass.getDeclaredMethod("addApplicationListener", new Class[] { applicationListenerClass });            // Create a proxy object around this handler that can be reflectively added as an Apple ApplicationListener            Object osxAdapterProxy = Proxy.newProxyInstance(OSXAdapter.class.getClassLoader(), new Class[] { applicationListenerClass }, adapter);            addListenerMethod.invoke(macOSXApplication, new Object[] { osxAdapterProxy });        } catch (ClassNotFoundException cnfe) {            System.err.println("This version of Mac OS X does not support the Apple EAWT.  ApplicationEvent handling has been disabled (" + cnfe + ")");        } catch (Exception ex) {  // Likely a NoSuchMethodException or an IllegalAccessException loading/invoking eawt.Application methods            System.err.println("Mac OS X Adapter could not talk to EAWT:");            ex.printStackTrace();        }    }    // Each OSXAdapter has the name of the EAWT method it intends to listen for (handleAbout, for example),    // the Object that will ultimately perform the task, and the Method to be called on that Object    protected OSXAdapter(String proxySignature, Object target, Method handler) {        this.proxySignature = proxySignature;        this.targetObject = target;        this.targetMethod = handler;    }        // Override this method to perform any operations on the event     // that comes with the various callbacks    // See setFileHandler above for an example    public boolean callTarget(Object appleEvent) throws InvocationTargetException, IllegalAccessException {        Object result = targetMethod.invoke(targetObject, (Object[])null);        if (result == null) {            return true;        }        return Boolean.valueOf(result.toString()).booleanValue();    }        // InvocationHandler implementation    // This is the entry point for our proxy object; it is called every time an ApplicationListener method is invoked    public Object invoke (Object proxy, Method method, Object[] args) throws Throwable {        if (isCorrectMethod(method, args)) {            boolean handled = callTarget(args[0]);            setApplicationEventHandled(args[0], handled);        }        // All of the ApplicationListener methods are void; return null regardless of what happens        return null;    }        // Compare the method that was called to the intended method when the OSXAdapter instance was created    // (e.g. handleAbout, handleQuit, handleOpenFile, etc.)    protected boolean isCorrectMethod(Method method, Object[] args) {        return (targetMethod != null && proxySignature.equals(method.getName()) && args.length == 1);    }        // It is important to mark the ApplicationEvent as handled and cancel the default behavior    // This method checks for a boolean result from the proxy method and sets the event accordingly    protected void setApplicationEventHandled(Object event, boolean handled) {        if (event != null) {            try {                Method setHandledMethod = event.getClass().getDeclaredMethod("setHandled", new Class[] { boolean.class });                // If the target method returns a boolean, use that as a hint                setHandledMethod.invoke(event, new Object[] { Boolean.valueOf(handled) });            } catch (Exception ex) {                System.err.println("OSXAdapter was unable to handle an ApplicationEvent: " + event);                ex.printStackTrace();            }        }    }}