Changing NSCursor for NSView above an NSTextView

Question

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

I have a NSTextView, then as sibling views, several othe

Answer 1

A few important notes:

• Be careful calling super on your mouseMoved or similar events, or the cursor might just get reset by the base class implementation.
• Only reset your tracking area when the parent view size changes; if you try to do this by overriding layout() it's going to be happening all the time which is not great

Here's an example class that you can just use as a base class in your storyboards.

Swift 4 code:

import Cocoa

final class MouseTrackingTextView: NSTextView {

    // MARK: - Lifecycle

    override func awakeFromNib() {
        setupTrackingArea()
    }

    // MARK: - Resizing

    // Call this in your controller's `viewDidLayout`
    // so it only gets called when the view resizes
    func superviewResized() {
        resetTrackingArea()
    }

    // MARK: - Mouse Events

    override func resetCursorRects() {
        addCursorRect(bounds, cursor: cursorType)
    }

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

    // MARK: - Private Properties

    private var currentTrackingArea: NSTrackingArea?

    private var cursorType: NSCursor {
        return isEditable ? .iBeam : .pointingHand
    }

    // MARK: - Private API

    private func setupTrackingArea() {
        let trackingArea = NSTrackingArea(rect: bounds,
                                          options: [.activeAlways, .mouseMoved],
                                          owner: self, userInfo: nil)
        currentTrackingArea = trackingArea
        addTrackingArea(trackingArea)
    }

    private func resetTrackingArea() {
        if let trackingArea = currentTrackingArea {
            removeTrackingArea(trackingArea)
        }
        setupTrackingArea()
    }

}