wehub-resource-sync
70 lines
2.2 KiB
Swift
70 lines
2.2 KiB
Swift
import AppKit
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import SwiftUI
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/// Lightweight NSView-based mouse tracking with local coordinates.
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///
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/// Why: SwiftUI's `onHover` doesn't provide location, but we want "hover a bar to see values" on macOS.
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@MainActor
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struct MouseLocationReader: NSViewRepresentable {
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let onMoved: (CGPoint?) -> Void
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func makeNSView(context: Context) -> TrackingView {
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let view = TrackingView()
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view.onMoved = self.onMoved
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return view
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}
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func updateNSView(_ nsView: TrackingView, context: Context) {
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nsView.onMoved = self.onMoved
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}
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final class TrackingView: NSView {
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var onMoved: ((CGPoint?) -> Void)?
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private var trackingArea: NSTrackingArea?
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override var isFlipped: Bool {
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true
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}
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override func viewDidMoveToWindow() {
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super.viewDidMoveToWindow()
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self.window?.acceptsMouseMovedEvents = true
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self.updateTrackingAreas()
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}
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override func updateTrackingAreas() {
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super.updateTrackingAreas()
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if let trackingArea {
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self.removeTrackingArea(trackingArea)
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}
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let options: NSTrackingArea.Options = [
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// NSMenu popups aren't "key windows", so `.activeInKeyWindow` would drop events and cause hover
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// state to flicker. `.activeAlways` keeps tracking stable while the menu is open.
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.activeAlways,
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.inVisibleRect,
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.mouseEnteredAndExited,
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.mouseMoved,
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]
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let area = NSTrackingArea(rect: .zero, options: options, owner: self, userInfo: nil)
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self.addTrackingArea(area)
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self.trackingArea = area
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}
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override func mouseEntered(with event: NSEvent) {
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super.mouseEntered(with: event)
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self.onMoved?(self.convert(event.locationInWindow, from: nil))
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}
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override func mouseMoved(with event: NSEvent) {
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super.mouseMoved(with: event)
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self.onMoved?(self.convert(event.locationInWindow, from: nil))
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}
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override func mouseExited(with event: NSEvent) {
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super.mouseExited(with: event)
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self.onMoved?(nil)
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}
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}
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}
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