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

content/browser/renderer_host/input/touch_selection_controller_client_aura.h

+// 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 CONTENT_BROWSER_RENDERER_HOST_INPUT_TOUCH_SELECTION_CONTROLLER_CLIENT_AURA_H_
+#define CONTENT_BROWSER_RENDERER_HOST_INPUT_TOUCH_SELECTION_CONTROLLER_CLIENT_AURA_H_
+
+#include "base/timer/timer.h"
+#include "ui/touch_selection/touch_selection_controller.h"
+#include "ui/touch_selection/touch_selection_menu_runner.h"
+
+namespace content {
+class RenderWidgetHostViewAura;
+
+// An implementation of |TouchSelectionControllerClient| to be used in Aura's
+// implementation of touch selection for contents.
+class TouchSelectionControllerClientAura
+    : public ui::TouchSelectionControllerClient,
+      public ui::TouchSelectionMenuClient {
+ public:
+  explicit TouchSelectionControllerClientAura(RenderWidgetHostViewAura* rwhva);
+  ~TouchSelectionControllerClientAura() override;
+
+  void OnWindowMoved();

[sadrul, 2015/07/15 17:00:15]

Document of this is called only for the RWHVA's window, or for its parent
window(s) too.

[mohsen, 2015/07/16 22:06:19]

Done.

+  void OnTouchDown();
+  void OnTouchUp();

[sadrul, 2015/07/15 17:00:15]

Document if this happens for all touch up/down events, or just the first down
and last up of a sequence.

[mohsen, 2015/07/16 22:06:19]

Done.

+  void OnScrollStarted();
+  void OnScrollCompleted();

[sadrul, 2015/07/15 17:00:15]

Document if this is called just for touch-scroll, or also for wheel-scroll.

[mohsen, 2015/07/16 22:06:19]

Done.

+
+ private:
+  class EnvPreTargetHandler;
+
+  bool IsQuickMenuAllowed() const;
+  void ShowQuickMenu();
+  void UpdateQuickMenu();
+
+  // ui::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(ui::SelectionEventType event) override;
+  scoped_ptr<ui::TouchHandleDrawable> CreateDrawable() override;
+
+  // ui::TouchSelectionMenuClient:
+  bool IsCommandIdEnabled(int command_id) const override;
+  void ExecuteCommand(int command_id, int event_flags) override;
+  void RunContextMenu() override;
+
+  // Not owned, non-null for the lifetime of this object.
+  RenderWidgetHostViewAura* rwhva_;
+
+  base::Timer quick_menu_timer_;
+  bool touch_down_;
+  bool scroll_in_progress_;
+  bool handle_drag_in_progress_;
+
+  // A pre-target event handler for aura::Env which deactivates touch selection
+  // on mouse and keyboard events.
+  scoped_ptr<EnvPreTargetHandler> env_pre_target_handler_;
+
+  DISALLOW_COPY_AND_ASSIGN(TouchSelectionControllerClientAura);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_TOUCH_SELECTION_CONTROLLER_CLIENT_AURA_H_