files

ios/Classes/FilePlugin.swift

@@ -0,0 +1,115 @@
+import Flutter
+import QuickLook
+import UIKit
+
+public class FilePlugin: NSObject, NativePlugin {
+    private var channel: FlutterMethodChannel?
+    private var previewDataSource: FilePreviewDataSource?
+
+    public func register(with registrar: FlutterPluginRegistrar) {
+        let c = FlutterMethodChannel(name: "ux/file", binaryMessenger: registrar.messenger())
+        c.setMethodCallHandler { [weak self] call, result in
+            self?.handle(call, result: result)
+        }
+        channel = c
+    }
+
+    private func handle(_ call: FlutterMethodCall, result: @escaping FlutterResult) {
+        switch call.method {
+        case "share": handleShare(call, result: result)
+        case "open":  handleOpen(call, result: result)
+        default:      result(FlutterMethodNotImplemented)
+        }
+    }
+
+    private func handleShare(_ call: FlutterMethodCall, result: @escaping FlutterResult) {
+        guard let args = call.arguments as? [String: Any],
+              let path = args["path"] as? String else {
+            return result(FlutterError(code: "bad_args", message: "path is required", details: nil))
+        }
+        guard let topVC = UxWindow.topViewController else {
+            return result(FlutterError(code: "no_view", message: "no top view controller", details: nil))
+        }
+
+        let url = URL(fileURLWithPath: path)
+        let title = args["title"] as? String
+
+        let items: [Any] = title.map { [FileActivityItemSource(url: url, title: $0)] } ?? [url]
+        let vc = UIActivityViewController(activityItems: items, applicationActivities: nil)
+
+        if UIDevice.current.userInterfaceIdiom == .pad,
+           let popover = vc.popoverPresentationController {
+            popover.sourceView = topVC.view
+            if let r = args["sourceRect"] as? [String: Any],
+               let x = (r["x"] as? NSNumber)?.doubleValue,
+               let y = (r["y"] as? NSNumber)?.doubleValue,
+               let w = (r["w"] as? NSNumber)?.doubleValue,
+               let h = (r["h"] as? NSNumber)?.doubleValue {
+                popover.sourceRect = CGRect(x: x, y: y, width: w, height: h)
+            } else {
+                let b = topVC.view.bounds
+                popover.sourceRect = CGRect(x: b.midX, y: b.midY, width: 1, height: 1)
+                popover.permittedArrowDirections = []
+            }
+        }
+
+        topVC.present(vc, animated: true) {
+            result(true)
+        }
+    }
+
+    private func handleOpen(_ call: FlutterMethodCall, result: @escaping FlutterResult) {
+        guard let args = call.arguments as? [String: Any],
+              let path = args["path"] as? String else {
+            return result(FlutterError(code: "bad_args", message: "path is required", details: nil))
+        }
+        guard let topVC = UxWindow.topViewController else {
+            return result(FlutterError(code: "no_view", message: "no top view controller", details: nil))
+        }
+
+        let url = URL(fileURLWithPath: path)
+        let ds = FilePreviewDataSource(url: url)
+        // QLPreviewController requires a strong-retained data source.
+        previewDataSource = ds
+
+        let vc = QLPreviewController()
+        vc.dataSource = ds
+
+        topVC.present(vc, animated: true) {
+            result(true)
+        }
+    }
+}
+
+private final class FilePreviewDataSource: NSObject, QLPreviewControllerDataSource {
+    let url: URL
+    init(url: URL) { self.url = url }
+
+    func numberOfPreviewItems(in controller: QLPreviewController) -> Int { 1 }
+
+    func previewController(_ controller: QLPreviewController, previewItemAt index: Int) -> QLPreviewItem {
+        url as QLPreviewItem
+    }
+}
+
+private final class FileActivityItemSource: NSObject, UIActivityItemSource {
+    let url: URL
+    let title: String
+
+    init(url: URL, title: String) {
+        self.url = url
+        self.title = title
+    }
+
+    func activityViewControllerPlaceholderItem(_ controller: UIActivityViewController) -> Any {
+        url
+    }
+
+    func activityViewController(_ controller: UIActivityViewController, itemForActivityType type: UIActivity.ActivityType?) -> Any? {
+        url
+    }
+
+    func activityViewController(_ controller: UIActivityViewController, subjectForActivityType type: UIActivity.ActivityType?) -> String {
+        title
+    }
+}

ios/Classes/KeyboardPlugin.swift

@@ -267,22 +267,8 @@ public class KeyboardPlugin: NSObject, NativePlugin {
     }
 
     private func setupPanGesture() {
-        var targetView: UIView?
-
-        if let window = UIApplication.shared.delegate?.window ?? nil {
-            targetView = window.rootViewController?.view ?? window
-        } else {
-            for scene in UIApplication.shared.connectedScenes {
-                if let ws = scene as? UIWindowScene {
-                    for window in ws.windows where window.isKeyWindow {
-                        targetView = window.rootViewController?.view ?? window
-                        break
-                    }
-                }
-            }
-        }
-
-        guard let view = targetView else { return }
+        guard let window = UxWindow.keyWindow else { return }
+        let view: UIView = window.rootViewController?.view ?? window
 
         let pan = UIPanGestureRecognizer(target: self, action: #selector(handlePan))
         pan.cancelsTouchesInView = false

ios/Classes/NativePlugin.swift

@@ -1,5 +1,23 @@
 import Flutter
+import UIKit
 
 public protocol NativePlugin {
     func register(with registrar: FlutterPluginRegistrar)
 }
+
+public enum UxWindow {
+    public static var keyWindow: UIWindow? {
+        if let w = UIApplication.shared.delegate?.window ?? nil { return w }
+        for scene in UIApplication.shared.connectedScenes {
+            guard let ws = scene as? UIWindowScene else { continue }
+            for window in ws.windows where window.isKeyWindow { return window }
+        }
+        return nil
+    }
+
+    public static var topViewController: UIViewController? {
+        var vc = keyWindow?.rootViewController
+        while let presented = vc?.presentedViewController { vc = presented }
+        return vc
+    }
+}

ios/Classes/UxPlugin.swift

@@ -8,6 +8,7 @@ public class UxPlugin: NSObject, FlutterPlugin {
         plugins = [
             KeyboardPlugin(),
             SensorPlugin(),
+            FilePlugin(),
         ]
         for plugin in plugins {
             plugin.register(with: registrar)