NSButton NSTrackingArea - 跟踪不起作用

Question

我正在尝试完成鼠标悬停事件上突出显示的按钮。因此，我将NSButton子类化，其中放入NSTrackingArea和方法- (void)mouseEntered:(NSEvent *)event- (void)updateTrackingAreas。

按钮的创建看起来是这样的（它在循环中，所以我使用数组来收集）：

        CalendarTile *button = [[CalendarTile alloc] init];
        [button setFrame:CGRectMake(point_x, point_y, button_frame_width, button_frame_height)];
        [button setBordered:NO];
        [button setBezelStyle:NSRegularSquareBezelStyle];
        [button setButtonType:NSMomentaryChangeButton];
        [button setFont:[NSFont fontWithName:@"Avenir Next" size:40]];
        [button setAlignment:NSCenterTextAlignment];
        [button setTitle:[NSString stringWithFormat:@"%i", i]];
        [button setTextColor:[NSColor colorWithCalibratedRed:(float)62/255 green:(float)62/255 blue:(float)62/255 alpha:1.0]];
        [arrayWithButtons addObject:button];
        ...
        for (CalendarTile *btn in arrayWithButton) {
        [self addSubview:btn];
        }

这是一个子类-CalendarTile.m:

@implementation CalendarTile
- (void)updateTrackingAreas
{
    [super updateTrackingAreas];
    if (trackingArea)
    {
        [self removeTrackingArea:trackingArea];
    }
    NSTrackingAreaOptions options = NSTrackingInVisibleRect | NSTrackingMouseEnteredAndExited | NSTrackingActiveInKeyWindow;
    trackingArea = [[NSTrackingArea alloc] initWithRect:NSZeroRect options:options owner:self userInfo:nil];
    [self addTrackingArea:trackingArea];
}
- (void)mouseEntered:(NSEvent *)event
{
    [self setImage:[NSImage imageNamed:@"highlight.png"]];
    NSLog(@"HIGHLIGHT");
}

当我把鼠标放在上面时，它应该在日志中说"HIGHLIGHT"——遗憾的是，它没有。

你能帮我吗？我做错了什么？

Answer 1

这是我完美地为自己创造和工作的。。。

步骤1：创建带有跟踪区域的按钮

 NSButton *myButton = [[NSButton alloc] initWithFrame:NSMakeRect(100, 7, 100, 50)];
[myButton setTitle:@"sample"];
[self.window.contentView addSubview:myButton];
// Insert code here to initialize your application
NSTrackingArea* trackingArea = [[NSTrackingArea alloc]
                                initWithRect:[myButton bounds]
                                options:NSTrackingMouseEnteredAndExited | NSTrackingActiveAlways
                                owner:self userInfo:nil];
[myButton addTrackingArea:trackingArea];

步骤：2实施以下方法

- (void)mouseEntered:(NSEvent *)theEvent{
NSLog(@"entered");
[[myButton cell] setBackgroundColor:[NSColor blueColor]];

}
- (void)mouseExited:(NSEvent *)theEvent{
[[myButton cell] setBackgroundColor:[NSColor redColor]];
NSLog(@"exited");
}

Answer 2

尝试

trackingArea = [[NSTrackingArea alloc] initWithRect:NSZeroRect options:options owner:self userInfo:nil];

而不是

NSTrackingAreaOptions options = NSTrackingMouseEnteredAndExited | NSTrackingActiveAlways;
    trackingArea = [[NSTrackingArea alloc] initWithRect:self.frame options:options owner:self userInfo:nil];