Reland: Implement Aura side of unified touch text selection for contents

ui/touch_selection/touch_selection_controller_aura.h

Index: ui/touch_selection/touch_selection_controller_aura.h
diff --git a/ui/touch_selection/touch_selection_controller_aura.h b/ui/touch_selection/touch_selection_controller_aura.h
new file mode 100644
index 0000000000000000000000000000000000000000..7e91b4c566043e080cbf5a9998b8bcd221aa53e0
--- /dev/null
+++ b/ui/touch_selection/touch_selection_controller_aura.h
@@ -0,0 +1,120 @@
+// Copyright 2015 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_TOUCH_SELECTION_TOUCH_SELECTION_CONTROLLER_AURA_H_
+#define UI_TOUCH_SELECTION_TOUCH_SELECTION_CONTROLLER_AURA_H_
+
+#include "base/timer/timer.h"
+#include "ui/events/event_handler.h"
+#include "ui/touch_selection/touch_selection_controller.h"
+#include "ui/touch_selection/touch_selection_menu_runner.h"
+
+namespace aura {
+class Window;
+}
+
+namespace ui {
+class MotionEventAura;
+class TouchEvent;
+
+// The interface used by TouchSelectionControllerAura to communicate with its
+// client.
+class UI_TOUCH_SELECTION_EXPORT TouchSelectionControllerAuraClient {
+ public:
+  virtual ~TouchSelectionControllerAuraClient() {};
+
+  virtual void MoveCaret(const gfx::PointF& position) = 0;
+  virtual void MoveRangeSelectionExtent(const gfx::PointF& extent) = 0;
+  virtual void SelectBetweenCoordinates(const gfx::PointF& base,
+                                        const gfx::PointF& extent) = 0;
+  virtual aura::Window* GetParentWindow() const = 0;
+  virtual gfx::Rect GetClientBounds() const = 0;
+  virtual bool IsCommandIdEnabled(int command_id) const = 0;
+  virtual void ExecuteCommand(int command_id, int event_flags) = 0;
+  virtual void OpenContextMenu(const gfx::PointF& point) = 0;
+};
+
+// Aura specific implementaion of a touch selection controller. Wraps an
+// instance of TouchSelectionController and augments it with additional behavior
+// needed in Aura.
+class UI_TOUCH_SELECTION_EXPORT TouchSelectionControllerAura

[sadrul, 2015/03/05 12:37:03]

Calling this TouchSelectionControllerAura when it is not a
TouchSelectionController can be confusing. (e.g. RenderWidgetHostViewAura is-a
RenderWidgetHostView, NativeWidgetAura is-a NativeWidget, etc.)

[mohsen, 2015/03/06 23:10:08]

Yeah. Any suggestions? AuraTouchSelectionController?!

+    : public TouchSelectionControllerClient,
+      public TouchSelectionMenuClient,
+      public EventHandler {
+ public:
+  explicit TouchSelectionControllerAura(
+      TouchSelectionControllerAuraClient* client);
+  ~TouchSelectionControllerAura() override;
+
+  void OnSelectionEditable(bool editable);
+  void OnSelectionEmpty(bool empty);
+  void OnSelectionBoundsUpdated(const SelectionBound& start,
+                                const SelectionBound& end);
+  void HandleGestureEvent(GestureEvent* event);
+  void HandleTouchEvent(TouchEvent* event);

[sadrul, 2015/03/05 12:37:03]

Why have these two separate, instead of overriding the equivalents from
EventHandler?

[mohsen, 2015/03/06 23:10:08]

EventHandler equivalents were for pre-target handling of Env. Now that I created
a separate pre-target handler class for Env, I'm replaced these two with
EventHandler equivalents.

+  void HideAndDisallowShowingAutomatically();
+  void OnWindowMoved();
+  void OnOverscrollStarted();
+  void OnOverscrollCompleted();
+  void OnFlingCompleted();
+
+ protected:
+  // TouchSelectionControllerClient:
+  bool SupportsAnimation() const override;
+  void SetNeedsAnimate() override;
+  void MoveCaret(const gfx::PointF& position) override;
+  void MoveRangeSelectionExtent(const gfx::PointF& extent) override;
+  void SelectBetweenCoordinates(const gfx::PointF& base,
+                                const gfx::PointF& extent) override;
+  void OnSelectionEvent(SelectionEventType event,
+                        const gfx::PointF& position) override;
+  scoped_ptr<TouchHandleDrawable> CreateDrawable() override;
+
+ private:
+  friend class TestTouchSelectionControllerAura;
+
+  gfx::Rect GetMenuAnchorRect() const;
+  void ShowQuickMenu();
+  void UpdateQuickMenu();
+  bool IsQuickMenuAllowed() const;
+
+  // TouchSelectionMenuClient:
+  bool IsCommandIdEnabled(int command_id) const override;
+  void ExecuteCommand(int command_id, int event_flags) override;
+  void OpenContextMenu() override;
+
+  // EventHandler:
+  void OnKeyEvent(KeyEvent* event) override;
+  void OnMouseEvent(MouseEvent* event) override;
+  void OnScrollEvent(ScrollEvent* event) override;
+
+  void set_immediate_quick_menu_for_testing(bool immediate) {
+    immediate_quick_menu_for_testing_ = immediate;
+  }
+
+  bool is_insertion_active_for_testing() const {
+    return controller_->is_insertion_active();
+  }
+
+  bool is_selection_active_for_testing() const {
+    return controller_->is_selection_active();
+  }

[sadrul, 2015/03/05 12:37:03]

Can you move these to TestApi pattern?

[mohsen, 2015/03/06 23:10:08]

Done.

+
+  TouchSelectionControllerAuraClient* client_;
+  scoped_ptr<MotionEventAura> motion_event_;
+  scoped_ptr<TouchSelectionController> controller_;
+  base::OneShotTimer<TouchSelectionControllerAura> quick_menu_timer_;
+  bool scroll_in_progress_;
+  bool overscroll_in_progress_;
+  bool handle_drag_in_progress_;
+  bool selection_editable_;
+
+  bool immediate_quick_menu_for_testing_;

[sadrul, 2015/03/05 12:37:03]

Doesn't look like this is ever initialized?

Also, move to test-api?

[mohsen, 2015/03/06 23:10:08]

Initialization fixed.
Also, moved this to test api. Though, I'm not sure if the result looks good.

+
+  DISALLOW_COPY_AND_ASSIGN(TouchSelectionControllerAura);
+};
+
+}  // namespace ui
+
+#endif  // UI_TOUCH_SELECTION_TOUCH_SELECTION_CONTROLLER_AURA_H_