1 // Copyright 2016 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #ifndef COMPONENTS_REMOTE_COCOA_APP_SHIM_WINDOW_MOVE_LOOP_H_
6 #define COMPONENTS_REMOTE_COCOA_APP_SHIM_WINDOW_MOVE_LOOP_H_
7 
8 #import <Cocoa/Cocoa.h>
9 
10 #include "base/callback.h"
11 #include "base/memory/weak_ptr.h"
12 
13 namespace remote_cocoa {
14 class NativeWidgetNSWindowBridge;
15 
16 // Used by NativeWidgetNSWindowBridge when dragging detached tabs.
17 class CocoaWindowMoveLoop {
18  public:
19   CocoaWindowMoveLoop(NativeWidgetNSWindowBridge* owner,
20                       const NSPoint& initial_mouse_in_screen);
21   ~CocoaWindowMoveLoop();
22 
23   // Initiates the drag until a mouse up event is observed, or End() is called.
24   // Returns true if a mouse up event ended the loop.
25   bool Run();
26   void End();
27 
28  private:
29   enum LoopExitReason {
30     ENDED_EXTERNALLY,
31     MOUSE_UP,
32     WINDOW_DESTROYED,
33   };
34 
35   NativeWidgetNSWindowBridge* owner_;  // Weak. Owns this.
36 
37   // Initial mouse location at the time before the CocoaWindowMoveLoop is
38   // created.
39   NSPoint initial_mouse_in_screen_;
40 
41   // Pointer to a stack variable holding the exit reason.
42   LoopExitReason* exit_reason_ref_ = nullptr;
43   base::OnceClosure quit_closure_;
44 
45   // WeakPtrFactory for event monitor safety.
46   base::WeakPtrFactory<CocoaWindowMoveLoop> weak_factory_;
47 
48   DISALLOW_COPY_AND_ASSIGN(CocoaWindowMoveLoop);
49 };
50 
51 }  // namespace remote_cocoa
52 
53 #endif  // COMPONENTS_REMOTE_COCOA_APP_SHIM_WINDOW_MOVE_LOOP_H_
54