MacViews: Implement Tab Dragging

ui/views/cocoa/cocoa_window_move_loop.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef UI_VIEWS_COCOA_COCOA_WINDOW_MOVE_LOOP_H_
+#define UI_VIEWS_COCOA_COCOA_WINDOW_MOVE_LOOP_H_
+
+#include "ui/gfx/geometry/point.h"
+#include "ui/views/widget/widget.h"
+
+namespace views {
+class BridgedNativeWidget;
+
+// Added as an kCGEventSourceUserData to the simulated CGEvents that shouldn't
+// be processed by the BridgedContentViews.
+extern const int kCocoaWindowMoveLoopSimulatedEventUserData;

[tapted, 2016/04/13 08:28:13]

nit: declare as a static member on CocoaWindowMoveLoop

[themblsha, 2016/04/18 09:30:02]

Done.

+
+// Used by views::BridgedNativeWidget

[tapted, 2016/04/13 08:28:12]

This can say more. E.g.

// Used when dragging tabs, to manually position the window.

[themblsha, 2016/04/18 09:30:02]

Done.

+class CocoaWindowMoveLoop {
+ public:
+  explicit CocoaWindowMoveLoop(BridgedNativeWidget* owner,

[tapted, 2016/04/13 08:28:12]

nit: explicit not needed

[themblsha, 2016/04/18 09:30:02]

Done.

+                               gfx::Point initial_mouse_in_screen);

[tapted, 2016/04/13 08:28:13]

nit: const ref

[themblsha, 2016/04/18 09:30:02]

Done.

+  ~CocoaWindowMoveLoop();
+
+  Widget::MoveLoopResult Run();

[tapted, 2016/04/13 08:28:13]

this looks weird without a comment. Perhaps it's worth saying under what
conditions the Run will end e.g.

// Initiates the drag with a simulated mouse click then monitors window server
events until a mouse up or Escape keypress is observed, or End() is called.

[themblsha, 2016/04/18 09:30:01]

Thanks, done.

+  void End();
+
+ private:
+  enum LoopExitReason {
+    ENDED_EXTERNALLY,
+    ESCAPE_PRESSED,
+    MOUSE_UP,
+    WINDOW_DESTROYED,
+  };
+
+  BridgedNativeWidget* owner_;  // Weak. Owns this.
+  scoped_ptr<base::RunLoop> run_loop_;
+
+  // Initial mouse location at the time before the CocoaWindowMoveLoop is
+  // created. Cache this as the mouse could be moved when we're inside Run(),

[tapted, 2016/04/13 08:28:13]

remove "we're"

[themblsha, 2016/04/18 09:30:02]

Done.

+  // and then sending the MouseDown event will fail.

[tapted, 2016/04/13 08:28:12]

say why it will fail?

[themblsha, 2016/04/18 09:30:01]

Done.

+  gfx::Point initial_mouse_in_screen_;
+
+  // Pointer to a stack variable holding the exit reason.
+  LoopExitReason* exit_reason_ref_ = nullptr;
+  base::Closure quit_closure_;
+
+  // WeakPtrFactory for event monitor safety.
+  base::WeakPtrFactory<CocoaWindowMoveLoop> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(CocoaWindowMoveLoop);
+};
+
+}  // namespace views
+
+#endif  // UI_VIEWS_COCOA_COCOA_WINDOW_MOVE_LOOP_H_