当光标悬停在NSTextView内的NSButton时,如何强制光标成为"arrowCursor"？

Question

好的,问题是:
我有一个NSTextView,我添加自定义NSButton使用:

[_textView addSubview:button];

然后,在我的NSButton子类中,我(以及NSTrackingArea东西):

- (void)mouseEntered:(NSEvent *)event{
     [[NSCursor arrowCursor] set];
}

- (void)mouseExited:(NSEvent *)theEvent{
     [[NSCursor arrowCursor] set];
}

- (void)mouseDown:(NSEvent *)theEvent{
     [[NSCursor arrowCursor] set];
}

- (void)mouseUp:(NSEvent *)theEvent{
     [[NSCursor arrowCursor] set];
}

但是当我悬停它时,光标保持不变IBeamCursor(因为它是a NSTextView).只有当我按下按钮时,光标才会更新.然后,当我移动鼠标时,仍然在按钮内,光标返回到IBeamCursor.

关于如何做到这一点的任何想法？谢谢!

Answer 1

添加仅跟踪进入/退出事件的跟踪区域对于NSTextView子视图来说似乎是不够的.不知何故,textview总是赢得并设置它 IBeamCursor.

在子类中添加跟踪区域时,您可以尝试始终启用鼠标移动事件跟踪(NSTrackingMouseMoved)NSButton:

#import "SSWHoverButton.h"

@interface SSWHoverButton()
{
    NSTrackingArea* trackingArea;
}

@end

@implementation SSWHoverButton

- (void)mouseMoved:(NSEvent*)theEvent
{
    [[NSCursor arrowCursor] set];
}

- (void)updateTrackingAreas
{
    if(trackingArea != nil)
    {
        [self removeTrackingArea:trackingArea];
    }
    NSTrackingAreaOptions opts = (NSTrackingMouseMoved|NSTrackingActiveAlways);
    trackingArea = [[NSTrackingArea alloc] initWithRect:[self bounds]
                                                 options:opts
                                                   owner:self
                                                userInfo:nil];
    [self addTrackingArea:trackingArea];
}

- (void)dealloc
{
    [self removeTrackingArea:trackingArea];
}

@end

Answer 2

Swift 5 变体：

import Cocoa

class InsideTextButton: NSButton {

    var trackingArea: NSTrackingArea?

    override func mouseMoved(with event: NSEvent) {
        NSCursor.arrow.set()
    }

    override func updateTrackingAreas() {
        if let area = trackingArea {
            removeTrackingArea(area)
        }

        trackingArea = NSTrackingArea(rect: self.bounds, options: [.mouseMoved, .activeAlways], owner: self, userInfo: nil)

        if let area = trackingArea {
            addTrackingArea(area)
        }
    }

    deinit {
        if let area = trackingArea {
            removeTrackingArea(area)
        }
    }
}