Refactor PasswordSetupUI, PassportUI, GalleryUI and related modules

submodules/LegacyUI/Sources/LegacyEmptyController.swift

@@ -0,0 +1,50 @@
+import Foundation
+import UIKit
+import LegacyComponents
+import Display
+
+public final class LegacyEmptyController: TGViewController {
+    override public init!(context: LegacyComponentsContext!) {
+        super.init(context: context)
+    }
+    
+    required public init?(coder aDecoder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+    
+    override public func viewDidLoad() {
+        self.view.backgroundColor = nil
+        self.view.isOpaque = false
+    }
+    
+    override public func present(context generator: ((LegacyComponentsContext?) -> UIViewController?)!) {
+        if let context = self.context as? LegacyControllerContext, let controller = context.controller {
+            let context = legacyContextGet()
+            let presentationData = context?.sharedContext.currentPresentationData.with { $0 }
+            
+            let legacyController = LegacyController(presentation: .modal(animateIn: true), theme: presentationData?.theme, initialLayout: controller.currentlyAppliedLayout)
+            guard let presentedController = generator(legacyController.context) else {
+                return
+            }
+            if let presentationData = presentationData {
+                legacyController.statusBar.statusBarStyle = presentationData.theme.rootController.statusBarStyle.style
+            }
+            presentedController.navigation_setDismiss({ [weak legacyController] in
+                legacyController?.dismiss()
+            }, rootController: nil)
+            if let presentedController = presentedController as? TGViewController {
+                presentedController.customDismissSelf = { [weak legacyController] in
+                    legacyController?.dismiss()
+                }
+            } else if let presentedController = presentedController as? TGNavigationController {
+                presentedController.customDismissSelf = { [weak legacyController] in
+                    legacyController?.dismiss()
+                }
+            }
+            legacyController.bind(controller: presentedController)
+            controller.present(legacyController, in: .window(.root))
+        } else {
+            super.present(context: generator)
+        }
+    }
+}