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Youtube 播放器似乎发送虚假的用户输入事件以防止屏幕保护程序启动（我在 osx/safari 上，但在 Windows 中也会发生同样的事情）。嵌入式播放器和 yt 网站上的播放器都会发生这种情况。我猜这是设计使然，这样屏幕保护程序就不会在您尝试观看视频时惹恼您。

但是，我正在尝试从屏幕保护程序中播放 youtube 视频，因此我想捕获并忽略或关闭这些事件。 当我的屏幕保护程序优雅退出时，它可以正常工作 6-8 秒，就像用户移动鼠标一样。我认为在 Windows 下我可以捕获它并忽略它，但我正在为 OSX 编写它，所以我似乎无法将它捕获我的代码，因为它永远不会到达我的代码 - 它由 ScreenSaverEngine 应用程序处理。Mac 屏幕保护程序是此应用程序的插件，因此它们不能覆盖主事件循环（调用 NSApplication::sendEvent）。我第一次听说这个事件是在 applicationShouldTerminate() 委托中。我可以要求应用程序稍后终止，但这只会将关闭延迟大约 1 秒。堆栈跟踪如下 - 从我可以看出它是正在发送的 MouseExit 苹果事件。

我看了又看，我找不到在可可或javascript中禁用或捕获这些播放器事件的方法。我的实际视频被加载到 WebView 并使用 youtube javascript api 运行，但下面的精简测试代码会产生相同的结果。通过执行以下操作，我也可以在不运行任何代码的情况下获得相同的结果：

（1）在 youtube 中播放视频（无论是否嵌入）（2）通过热角或其他方式手动启动屏幕保护程序（3）等待几秒钟

长期以来，我一直认为这是我的代码中的一个错误，因为我是 Objective-c 和 javascript 的新手，但现在我认为这是设计使然，因为上述步骤完全不使用我的代码即可重现问题。

屏保测试代码-----.h文件

#import <WebKit/WebKit.h>
#import <ScreenSaver/ScreenSaver.h>

@interface YtTestView : ScreenSaverView
{
    WebView * webView;
}

@end

屏保测试代码 ----- .m 文件 - 我认为大多数参数对于这个例子来说都是多余的，但这是改编自 Alastair Tse 的一个很好的例子（https://github.com/liquidx/webviewscreensaver）

#import "YtTestView.h"

@implementation YtTestView

- (id)initWithFrame:(NSRect)frame isPreview:(BOOL)isPreview
{
    self = [super initWithFrame:frame isPreview:isPreview];
    if (self) {
        [self setAnimationTimeInterval:1/30.0];
    }

    return self;
}

- (void)startAnimation
{
    [super startAnimation];

    webView = [[WebView alloc] initWithFrame:[self bounds]];
    [webView setFrameLoadDelegate:self];
    [webView setShouldUpdateWhileOffscreen:YES];
    [webView setPolicyDelegate:self];
    [webView setUIDelegate:self];
    [webView setEditingDelegate:self];
    [webView setAutoresizingMask:NSViewWidthSizable|NSViewHeightSizable];
    [webView setAutoresizesSubviews:YES];
    [webView setDrawsBackground:NO];
    [webView setMaintainsBackForwardList:NO];
    [self addSubview:webView];

    NSString * url= @"http://www.youtube.com/embed/NleT--L6fNo?autoplay=1";
    [webView setMainFrameURL:url];
}

- (void)stopAnimation
{
    [super stopAnimation];
}

- (void)drawRect:(NSRect)rect
{
    [super drawRect:rect];
}

- (void)animateOneFrame
{
    return;
}

- (BOOL)hasConfigureSheet
{
    return NO;
}

- (NSWindow*)configureSheet
{
    return nil;
}

@end

-------- applicationShouldTerminate() 中的堆栈跟踪 - 仅供参考

2013-05-20 23:41:20.558 ScreenSaverEngine[2143:c07] 事件：NSEvent: type=Kitdefined loc=(0,800) time=21467.6 flags=0 win=0x0 winNum=0 ctxt=0x0 subtype=1 data1=619 data2 =0 2013-05-20 23:41:20.558 ScreenSaverEngine[2143:c07] 窗口类名：(null) 2013-05-20 23:41:20.559 ScreenSaverEngine[2143:c07] 事件：type=13 2013-05-20 23:41:20.561 ScreenSaverEngine[2143:c07] 0:0 Ytss 0x0000000106167327 -[YtssView(NSApplicationDelegate) applicationShouldTerminate:] + 343 2013-05-20 23:41:20.562 ScreenSaverEngine[2143:3007] 1:1: 1 AppKit NSApplication _docController:shouldTerminate:] + 75 2013-05-20 23:41:20.562 ScreenSaverEngine[2143:c07] 2:2 AppKit 0x00007fff85623d7e __91-[NSDocumentController(NSInternal) _closeAllDocumentsWithDelegate:shouldTerminateSelector:]_block_invoke_0 + 159 2013-05-20 23:41:20.562 ScreenSaverEngine[2143:c07] 3:3 AppKit 0x00007fff85623c1a -[NSDocumentController(NSInternal) _closeAllDocumentsWithDelegate:shouldTerminateSelector:] + 15032 3:41:-2 ScreensAverEngine [2143：C07] 4：4 AppKit 0x00007FFF856235DE- [NSDocumentController（nsinternal）__closealLdocumentsWithDelegate：shoreTermInateSelector：shosserinateSelector：] + 265 2013-05-20 2013-05-20 23：41：41：41：20.563 eppsensymit 7 f.21 fodyn.f.21 fof 3.21 fof 3.21 fof 3.21 fof。 + 772 2013-05-20 23:41:20.563 ScreenSaverEngine[2143:c07] 6:6 AppKit 0x00007fff8565127f -[NSApplication(NSAppleEventHandling) _handleAEQuit] + 403 2013-05-20 23:41:20.5606 ScreenSaverEngine[2143]: ：7 AppKit 0x00007fff854001b1-[NSApplication(NSAppleEventHandling)_handleCoreEvent:withReplyEvent:] + 660 2013-05-20 23:41:20.567 ScreenSaverEngine[2143:c07] 8: 8 Foundation 0x00007fff8ea2370b-[NSAppleEventManager dispatchRawCon:] +R308Reply20handler1RefAppleEvent:with -05-20 23:41:20.567 ScreenSaverEngine[2143:c07] 9: 9 Foundation 0x00007fff8ea2356d _NSAppleEventManagerGenericHandler + 106 2013-05-20 23:41:20.567 ScreenSaverEngine[2143:c07] 10: 10 AE 0x00007fff906fa078 _Z20aeDispatchAppleEventPK6AEDescPS_jPh + 307 2013-05 -20 23:41:20.567 ScreenSaverEngine[2143:c07] 11:11 AE 0x00007fff906f9ed911 AE 0x00007fff906f9ed911 AE 0x00007fff906f9ed9] + 660 2013-05-20 23:41:20.567 ScreenSaverEngine[2143:c07] 8:8 Foundation 0x00007fff8ea2370b -[NSAppleEventManager dispatchRawAppleEvent:withRawReply:handlerRefCon:] + 308 2013-05-20 23:41:20.561 ScreenSaverEngine[2 c07] 9: 9 Foundation 0x00007fff8ea2356d _NSAppleEventManagerGenericHandler + 106 2013-05-20 23:41:20.567 ScreenSaverEngine[2143:c07] 10: 10 AE 0x00007fff906fa078 _Z20aeDispatchAppleEventPK6AEDescPS_jPh + 307 2013-05-20 23:41:20.567 ScreenSaverEngine[2143:c07] 11:11 AE 0x00007fff906f9ed9] + 660 2013-05-20 23:41:20.567 ScreenSaverEngine[2143:c07] 8:8 Foundation 0x00007fff8ea2370b -[NSAppleEventManager dispatchRawAppleEvent:withRawReply:handlerRefCon:] + 308 2013-05-20 23:41:20.561 ScreenSaverEngine[2 c07] 9: 9 Foundation 0x00007fff8ea2356d _NSAppleEventManagerGenericHandler + 106 2013-05-20 23:41:20.567 ScreenSaverEngine[2143:c07] 10: 10 AE 0x00007fff906fa078 _Z20aeDispatchAppleEventPK6AEDescPS_jPh + 307 2013-05-20 23:41:20.567 ScreenSaverEngine[2143:c07] 11:11 AE 0x00007fff906f9ed9567 ScreenSaverEngine[2143:c07] 9: 9 Foundation 0x00007fff8ea2356d _NSAppleEventManagerGenericHandler + 106 2013-05-20 23:41:20.567 ScreenSaverEngine[2143:c07] 10: 10 AE 0x00007fff906fa078 _Z20aeDispatchAppleEventPK6AEDescPS_jPh + 307 2013-05-20 23:41:20.567 ScreenSaverEngine [2143:c07] 11:11 AE 0x00007fff906f9ed9567 ScreenSaverEngine[2143:c07] 9: 9 Foundation 0x00007fff8ea2356d _NSAppleEventManagerGenericHandler + 106 2013-05-20 23:41:20.567 ScreenSaverEngine[2143:c07] 10: 10 AE 0x00007fff906fa078 _Z20aeDispatchAppleEventPK6AEDescPS_jPh + 307 2013-05-20 23:41:20.567 ScreenSaverEngine [2143:c07] 11:11 AE 0x00007fff906f9ed9ZL25dispatchEventAndSendReplyPK6AEDescPS17 AppKit 0x00007fff853f31d3 -[NSApplication 运行] + 517 2013-05-20 23:41:20.571 ScreenSaverEngine[2143:c07] 18:18 ScreenSaverEngine 0x0000000104b6e5a3 主 + 551 2013-03:571 23:41:4 ScreenSaverEngine] 19:19 libdyld.dylib 0x00007fff907b47e1 开始 + 0 2013-05-20 23:41:20.571 ScreenSaverEngine[2143:c07] 20:20 ??? 0x0000000000000001 0x0 + 1 20 ？？？0x0000000000000001 0x0 + 1 20 ？？？0x0000000000000001 0x0 + 1

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