macos - 鼠标离开 NSWindow 实例的事件

Question

是否有一种机制可以检测鼠标何时离开事件的 NSWindow 边界？

我已经尝试重写 mouseMoved: 方法，但当鼠标位于 NSWindow 边界之外时，不会调用该方法。

Answer 1

最好是使用NSTrackingArea

- (void)configureTrackingArea
{
    NSRect trackingRect = self.window.contentView.frame
    NSTrackingAreaOptions trackingOptions = NSTrackingMouseEnteredAndExited | NSTrackingActiveInKeyWindow;
    NSTrackingArea *trackingArea = [[NSTrackingArea alloc] initWithRect:trackingRect options:trackingOptions owner:self userInfo:nil];

    NSView *contentView = [[self window] contentView];
    [contentView addTrackingArea:trackingArea];
}


- (void)mouseEntered:(NSEvent *)event
{
    [[self window] addChildWindow:[self previewWindow] ordered:NSWindowAbove];
}

- (void)mouseExited:(NSEvent *)event
{
    [self hidePreviewWindow];
}