keyDown没有被调用

Question

我有一个名为SurfaceView的自定义NSView。它是NSWindow的contentView，它处理鼠标点击和绘图等基本事件。但是不管我做什么都没关系，它不处理keyDown函数。我已经覆盖了acceptFirstResponder但没有任何反应。

如果重要，我使用自定义NSEvent循环运行应用程序，如下所示：

NSDictionary* info = [[NSBundle mainBundle] infoDictionary];
NSString* mainNibName = [info objectForKey:@"NSMainNibFile"];

NSApplication* app = [NSApplication sharedApplication];
NSNib* mainNib = [[NSNib alloc] initWithNibNamed:mainNibName bundle:[NSBundle mainBundle]];
[mainNib instantiateNibWithOwner:app topLevelObjects:nil];

[app finishLaunching];

while(true)
{   
    NSEvent* event = [app nextEventMatchingMask:NSAnyEventMask untilDate:[NSDate date] inMode:NSDefaultRunLoopMode dequeue:YES];
    [app sendEvent:event];

    // Some code is execute here every frame to do some tasks...

    usleep(5000);
}

这是SurfaceView代码：

@interface SurfaceView : NSView
{
    Panel* panel;
}

@property (nonatomic) Panel* panel;

- (void)drawRect:(NSRect)dirtyRect;
- (BOOL)isFlipped;
- (void)mouseDown:(NSEvent *)theEvent;
- (void)mouseDragged:(NSEvent *)theEvent;
- (void)mouseUp:(NSEvent *)theEvent;
- (void)keyDown:(NSEvent *)theEvent;
- (BOOL)acceptsFirstResponder;
- (BOOL)becomeFirstResponder;

@end

-

@implementation SurfaceView

@synthesize panel;

- (BOOL)acceptsFirstResponder
{
    return YES;
};

- (void)keyDown:(NSEvent *)theEvent
{
    // this function is never called
};

...

@end

以下是我创建视图的方式：

NSWindow* window = [[NSWindow alloc] initWithContentRect:NSMakeRect(left, top, wide, tall) styleMask:NSBorderlessWindowMask | NSClosableWindowMask | NSMiniaturizableWindowMask backing:NSBackingStoreBuffered defer:NO];

...

[window makeKeyAndOrderFront:nil];

SurfaceView* mainView = [SurfaceView alloc];
[mainView initWithFrame:NSMakeRect(0, 0, wide, tall)];
mainView.panel = panel;
[window setContentView:mainView];
[window setInitialFirstResponder:mainView];
[window setNextResponder:mainView];
[window makeFirstResponder:mainView];

Answer 1

我发现阻止keyDown事件被调用的原因。它是NSBorderlessWindowMask掩码，它可以防止窗口成为键和主窗口。所以我创建了一个名为NSWindow的{​​{1}}的子类：

BorderlessWindow

Answer 2

除了答案：选中NSWindow的IB复选框。

应该检查

Title Bar。它类似于NSBorderlessWindowMask