Add Quick Look shortcut to the conversion completed view

Gifski/Base.lproj/MainMenu.xib

@@ -66,6 +66,13 @@
                                     <action selector="open:" target="-1" id="E6Y-20-4aZ"/>
                                 </connections>
                             </menuItem>
+                            <menuItem isSeparatorItem="YES" id="TB9-2E-bka"/>
+                            <menuItem title="Quick Look" keyEquivalent=" " id="Wfh-bM-KvX">
+                                <modifierMask key="keyEquivalentModifierMask"/>
+                                <connections>
+                                    <action selector="quickLook:" target="-1" id="IQy-U1-llq"/>
+                                </connections>
+                            </menuItem>
                             <menuItem isSeparatorItem="YES" id="m54-Is-iLE"/>
                             <menuItem title="Close" keyEquivalent="w" id="3u8-9s-Y0B">
                                 <connections>

Gifski/ConversionCompletedView.swift

@@ -1,4 +1,5 @@
 import Cocoa
+import Quartz
 
 final class ConversionCompletedView: SSView {
 	private let draggableFile = DraggableFile()
@@ -28,6 +29,10 @@ final class ConversionCompletedView: SSView {
 		$0.spacing = 20
 	}
 
+	private var isConversionCompleted: Bool {
+		return isHidden == false && fileUrl != nil
+	}
+
 	private func createButton(title: String) -> CustomButton {
 		return with(CustomButton()) {
 			$0.title = title
@@ -67,6 +72,9 @@ final class ConversionCompletedView: SSView {
 	}
 
 	func show() {
+		// We need to manually make self as the first responder, but when the view is hidden it is auto-removed
+		window?.makeFirstResponder(self)
+
 		fadeIn()
 	}
 
@@ -128,3 +136,64 @@ final class ConversionCompletedView: SSView {
 		])
 	}
 }
+
+extension ConversionCompletedView: QLPreviewPanelDataSource {
+	@IBAction private func quickLook(_ sender: Any) {
+		quickLookPreviewItems(nil)
+	}
+
+	override func quickLook(with event: NSEvent) {
+		quickLookPreviewItems(nil)
+	}
+
+	override func quickLookPreviewItems(_ sender: Any?) {
+		guard let panel = QLPreviewPanel.shared() else {
+			return
+		}
+
+		panel.toggle()
+	}
+
+	override func acceptsPreviewPanelControl(_ panel: QLPreviewPanel!) -> Bool {
+		return true
+	}
+
+	override func beginPreviewPanelControl(_ panel: QLPreviewPanel!) {
+		panel.delegate = self
+		panel.dataSource = self
+	}
+
+	override func endPreviewPanelControl(_ panel: QLPreviewPanel!) {
+		panel.dataSource = nil
+		panel.delegate = nil
+	}
+
+	func numberOfPreviewItems(in panel: QLPreviewPanel!) -> Int {
+		return 1
+	}
+
+	func previewPanel(_ panel: QLPreviewPanel!, previewItemAt index: Int) -> QLPreviewItem! {
+		return fileUrl as NSURL
+	}
+}
+
+extension ConversionCompletedView: QLPreviewPanelDelegate {
+	func previewPanel(_ panel: QLPreviewPanel!, sourceFrameOnScreenFor item: QLPreviewItem!) -> CGRect {
+		return draggableFile.imageView?.boundsInScreenCoordinates ?? .zero
+	}
+
+	func previewPanel(_ panel: QLPreviewPanel!, transitionImageFor item: QLPreviewItem!, contentRect: UnsafeMutablePointer<CGRect>!) -> Any! {
+		return draggableFile.image
+	}
+}
+
+extension ConversionCompletedView: NSMenuItemValidation {
+	func validateMenuItem(_ menuItem: NSMenuItem) -> Bool {
+		switch menuItem.action {
+		case #selector(quickLook(_:))?:
+			return isConversionCompleted
+		default:
+			return true
+		}
+	}
+}

Gifski/DraggableFile.swift

@@ -27,6 +27,10 @@ final class DraggableFile: NSImageView {
 		}
 	}
 
+	var imageView: NSView? {
+		return subviews.first
+	}
+
 	override init(frame: CGRect) {
 		super.init(frame: frame)
 

Gifski/MainWindowController.swift

@@ -321,7 +321,7 @@ extension MainWindowController: NSMenuItemValidation {
 		case #selector(open)?:
 			return !isRunning
 		default:
-			return validateMenuItem(menuItem)
+			return true
 		}
 	}
 }

Gifski/util.swift

@@ -1,5 +1,6 @@
 import Cocoa
 import AVFoundation
+import class Quartz.QLPreviewPanel
 
 /**
 Convenience function for initializing an object and modifying its properties
@@ -2112,3 +2113,20 @@ extension BinaryFloatingPoint {
 		return (self * divisor).rounded(rule) / divisor
 	}
 }
+
+extension QLPreviewPanel {
+	func toggle() {
+		if isVisible {
+			orderOut(nil)
+		} else {
+			makeKeyAndOrderFront(nil)
+		}
+	}
+}
+
+extension NSView {
+	/// Get the view frame in screen coordinates.
+	var boundsInScreenCoordinates: CGRect? {
+		return window?.convertToScreen(convert(bounds, to: nil))
+	}
+}