在NSTextView上方为NSView更改NSCursor [英] Changing NSCursor for NSView above an NSTextView

问题描述

发现了与我类似的问题(此)， 但是我的问题似乎与视图层次结构更多相关.

Found a similar question to mine(this), but my issues seems to be a bit more associated with view hierarchy.

我有一个NSTextView，然后有一个其他的NSView作为同级视图.

I have a NSTextView, then as sibling views, several other NSViews on top of it.

类似于上面链接的问题，我设置了一个跟踪区域，并按如下方式应用了光标:

Similar to the question linked above, I setup a tracking area, and applied the cursor as such:

class CursorChangingView: NSView {
    override func updateTrackingAreas() {
        let trackingArea = NSTrackingArea(rect: 
    }

    override func cursorUpdate(event: NSEvent) {
        NSCursor.arrowCursor().set()
    }
}

悬停时它似乎确实起作用，但是立即回到

It does seem to work when hovering, but immediately goes back to the IBeam Cursor, which is the default cursor for NSTextViews under this CursorChangingView.

这是将鼠标悬停在某个NSView上时应用更改光标的正确方法吗?它下面的NSTextView是否会覆盖我的改写?

Is this the proper way of applying changing the cursor when hovering over a certain NSView, and is the NSTextView under it overriding my overrriding?

推荐答案

所有您需要的是子类化自定义视图，重写awakeFromNib方法，为[.mouseMoved，.activeAlways]事件添加自定义跟踪区域: NSTrackingArea信息.无需覆盖resetCursorRects和/或updateTrackingAreas.您所需要做的就是重写mouseMoved方法并在此处设置所需的光标:

All you need is to subclass a custom view, override awakeFromNib method, add the custom tracking area for [.mouseMoved, .activeAlways] events: NSTrackingArea Info there. There is no need to override resetCursorRects and/or updateTrackingAreas. All you need is to override mouseMoved method and set the desired cursor there:

关于discardCursorRects方法的注意事项:

来自文档

您永远不需要直接调用此方法

You need never invoke this method directly

Xcode 9•Swift 4

import Cocoa

class CursorChangingView: NSView {

    override func awakeFromNib() {

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

        wantsLayer = true
        layer?.backgroundColor = NSColor.cyan.cgColor
        layer?.borderColor = NSColor.black.cgColor
        layer?.borderWidth = 1
    }

    @objc override func mouseMoved(with theEvent: NSEvent) {
        NSCursor.pointingHand.set()
    }
}

示例

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