ImBenjiandClaude Opus 5.5
b269201919
garage_auth, garage_entitlements, garage_iap and garage_ui, moved out of Garage-Services and Metro-Map-Maker into one public repo. MIT, one readme, docs under docs/. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_013F4NWNvYcdeSgqbWMT1VQ7
65 lines
2.6 KiB
Swift
65 lines
2.6 KiB
Swift
import Cocoa
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import FlutterMacOS
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// Hides the OS cursor and keeps it pinned in place for the duration of a
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// drag, streaming raw pointer deltas back to Dart ourselves.
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//
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// Why not just let Flutters own pointer events drive this: Flutter computes
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// PointerEvent.delta from the ABSOLUTE cursor position of consecutive
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// events, not from raw hardware deltaX/deltaY. An earlier version tried to
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// keep the cursor pinned by warping it back to an anchor point after every
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// move while staying associated in between - that still let the OS visibly
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// move the cursor between warps, and the warps themselves raced against
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// real movement over the async Dart<->native round trip.
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//
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// The actual fix: CGAssociateMouseAndMouseCursorPosition(false) for the
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// WHOLE gesture, not toggled per-event. WindowServer then simply stops
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// moving the on-screen cursor at all in response to hardware input - no
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// per-frame warping needed. mouseDragged events keep firing completely
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// normally while disassociated, with correct deltaX/deltaY reflecting real
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// HID movement (its only locationInWindow that freezes) - which is exactly
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// why we read deltaX/deltaY here instead of position. Re-associating on
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// unlock resumes normal 1:1 tracking from wherever the cursor was frozen,
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// so it naturally reappears back where the drag started.
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final class CursorLock {
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static let shared = CursorLock()
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private var locked = false
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private var monitor: Any?
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// strong on purpose - CursorLock.shared is a permanent singleton, theres
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// no retain cycle risk, and a weak ref here previously meant the channel
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// (whose only other strong reference was a local `let` in awakeFromNib)
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// got deallocated the moment that function returned, silently breaking
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// delta forwarding.
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private var channel: FlutterMethodChannel?
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func attach(channel: FlutterMethodChannel) {
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self.channel = channel
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}
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func lock() {
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guard !locked else { return }
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locked = true
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NSCursor.hide()
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CGAssociateMouseAndMouseCursorPosition(0)
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monitor = NSEvent.addLocalMonitorForEvents(matching: [.leftMouseDragged]) { [weak self] event in
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guard let self, self.locked else { return event }
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self.channel?.invokeMethod("scrubDelta", arguments: ["dx": event.deltaX, "dy": event.deltaY])
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// swallowed - Flutters own position for this event is frozen (and
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// therefore meaningless) while disassociated, no point forwarding it.
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return nil
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}
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}
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func unlock() {
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guard locked else { return }
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locked = false
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if let monitor {
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NSEvent.removeMonitor(monitor)
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}
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monitor = nil
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CGAssociateMouseAndMouseCursorPosition(1)
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NSCursor.unhide()
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}
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}
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