feat: animate actions panel and footer transitions

Sources/Conjure/ApplicationActionsController.swift

@@ -10,16 +10,19 @@ final class ApplicationActionsController: NSViewController, NSSearchFieldDelegat
     private let applicationLabel = NSTextField(labelWithString: "")
     private var mouseMonitor: Any?
     private weak var coveredPill: NSView?
-    private var coveredPillOpacity: Float = 1
+    private var coveredPillAlpha: CGFloat = 1
+    private var isClosing = false
+    private var transitionGeneration = 0
+    private var panel: ActionsPanelView { view as! ActionsPanelView }
     var uninstall: (() -> Void)?
     var closed: (() -> Void)?
-    var isShown: Bool { viewIfLoaded?.superview != nil }
+    var isShown: Bool { viewIfLoaded?.superview != nil && !isClosing }
 
     init() { super.init(nibName: nil, bundle: nil) }
     required init?(coder: NSCoder) { fatalError("Conjure creates actions programmatically") }
 
     override func loadView() {
-        view = NSView()
+        view = ActionsPanelView()
         view.wantsLayer = true
         view.layer?.shadowColor = NSColor.black.cgColor
         view.layer?.shadowOpacity = 0.35
@@ -138,16 +141,27 @@ final class ApplicationActionsController: NSViewController, NSSearchFieldDelegat
         applicationLabel.stringValue = application.name
         search.stringValue = ""
         controlTextDidChange(Notification(name: NSControl.textDidChangeNotification))
-        view.translatesAutoresizingMaskIntoConstraints = false
-        host.addSubview(view)
-        NSLayoutConstraint.activate([
-            view.trailingAnchor.constraint(equalTo: pill.trailingAnchor),
-            view.bottomAnchor.constraint(equalTo: pill.bottomAnchor)
-        ])
-        coveredPill = pill
-        coveredPillOpacity = pill.layer?.opacity ?? 1
-        pill.layer?.opacity = 0
+        transitionGeneration += 1
+        isClosing = false
+        panel.acceptsInteraction = true
+        panel.setAccessibilityHidden(false)
+        if view.superview == nil {
+            view.alphaValue = 0
+            view.translatesAutoresizingMaskIntoConstraints = false
+            host.addSubview(view)
+            NSLayoutConstraint.activate([
+                view.trailingAnchor.constraint(equalTo: pill.trailingAnchor),
+                view.bottomAnchor.constraint(equalTo: pill.bottomAnchor)
+            ])
+            coveredPill = pill
+            coveredPillAlpha = pill.alphaValue
+        }
         pill.setAccessibilityHidden(true)
+        NSAnimationContext.runAnimationGroup { context in
+            context.duration = NSWorkspace.shared.accessibilityDisplayShouldReduceMotion ? 0 : 0.16
+            view.animator().alphaValue = 1
+            pill.animator().alphaValue = 0
+        }
         window.makeFirstResponder(search)
         (search.currentEditor() as? NSTextView)?.insertionPointColor = SunsetPalette.accent
         mouseMonitor = NSEvent.addLocalMonitorForEvents(matching: [.leftMouseDown, .rightMouseDown]) { [weak self, weak pill] event in
@@ -165,12 +179,26 @@ final class ApplicationActionsController: NSViewController, NSSearchFieldDelegat
 
     func close() {
         guard isShown else { return }
+        transitionGeneration += 1
+        let generation = transitionGeneration
+        isClosing = true
+        panel.acceptsInteraction = false
+        panel.setAccessibilityHidden(true)
         if let mouseMonitor { NSEvent.removeMonitor(mouseMonitor) }
         mouseMonitor = nil
-        coveredPill?.layer?.opacity = coveredPillOpacity
         coveredPill?.setAccessibilityHidden(false)
-        coveredPill = nil
-        view.removeFromSuperview()
+        NSAnimationContext.runAnimationGroup { context in
+            context.duration = NSWorkspace.shared.accessibilityDisplayShouldReduceMotion ? 0 : 0.12
+            view.animator().alphaValue = 0
+            coveredPill?.animator().alphaValue = coveredPillAlpha
+        } completionHandler: { [weak self] in
+            MainActor.assumeIsolated {
+                guard let self, self.transitionGeneration == generation, self.isClosing else { return }
+                self.view.removeFromSuperview()
+                self.coveredPill = nil
+                self.isClosing = false
+            }
+        }
         closed?()
     }
 
@@ -199,6 +227,15 @@ final class ApplicationActionsController: NSViewController, NSSearchFieldDelegat
     }
 }
 
+@MainActor
+private final class ActionsPanelView: NSView {
+    var acceptsInteraction = true
+
+    override func hitTest(_ point: NSPoint) -> NSView? {
+        acceptsInteraction ? super.hitTest(point) : nil
+    }
+}
+
 @MainActor
 private final class ActionIconView: NSImageView {
     // SF Symbol optical insets otherwise enlarge a 22-point icon box beyond application icon sizing.