Support longpress drag selection

ui/touch_selection/touch_selection_controller.h

 // Copyright 2014 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_H_
 #define UI_TOUCH_SELECTION_TOUCH_SELECTION_CONTROLLER_H_
 
+#include "base/time/time.h"
 #include "ui/base/touch/selection_bound.h"
 #include "ui/gfx/geometry/point_f.h"
 #include "ui/gfx/geometry/rect_f.h"
+#include "ui/gfx/geometry/vector2d_f.h"
+#include "ui/touch_selection/longpress_drag_selector.h"
 #include "ui/touch_selection/selection_event_type.h"
 #include "ui/touch_selection/touch_handle.h"
 #include "ui/touch_selection/touch_handle_orientation.h"
 #include "ui/touch_selection/ui_touch_selection_export.h"
 
 namespace ui {
 class MotionEvent;
 
 // Interface through which |TouchSelectionController| issues selection-related
 // commands, notifications and requests.
@@ skipping 31 matching lines @@
   // Returns true iff the event was consumed, in which case the caller should
   // cease further handling of the event.
   bool WillHandleTouchEvent(const MotionEvent& event);
 
   // To be called before forwarding a tap event. This allows automatically
   // showing the insertion handle from subsequent bounds changes.
   void OnTapEvent();
 
   // To be called before forwarding a longpress event. This allows automatically
   // showing the selection or insertion handles from subsequent bounds changes.
-  void OnLongPressEvent();
+  void OnLongPressEvent(base::TimeTicks event_time,
+                        const gfx::PointF& location);
 
   // Allow showing the selection handles from the most recent selection bounds
   // update (if valid), or a future valid bounds update.
   void AllowShowingFromCurrentSelection();
 
   // Hide the handles and suppress bounds updates until the next explicit
   // showing allowance.
   void HideAndDisallowShowingAutomatically();
 
   // Override the handle visibility according to |hidden|.
@@ skipping 21 matching lines @@
 
   // Returns the focal point of the start and end bounds, as defined by
   // their bottom coordinate.
   const gfx::PointF& GetStartPosition() const;
   const gfx::PointF& GetEndPosition() const;
 
  private:
   enum InputEventType { TAP, LONG_PRESS, INPUT_EVENT_TYPE_NONE };
 
   // TouchHandleClient implementation.
-  void OnHandleDragBegin(const TouchHandle& handle) override;
-  void OnHandleDragUpdate(const TouchHandle& handle,
-                          const gfx::PointF& new_position) override;
-  void OnHandleDragEnd(const TouchHandle& handle) override;
+  void OnDragBegin(const TouchSelectionDraggable& draggable,
+                   const gfx::PointF& drag_position) override;
+  void OnDragUpdate(const TouchSelectionDraggable& draggable,
+                    const gfx::PointF& drag_position) override;
+  void OnDragEnd(const TouchSelectionDraggable& draggable) override;
   void OnHandleTapped(const TouchHandle& handle) override;
   void SetNeedsAnimate() override;
   scoped_ptr<TouchHandleDrawable> CreateDrawable() override;
   base::TimeDelta GetTapTimeout() const override;
   float GetTapSlop() const override;
 
   void ShowInsertionHandleAutomatically();
   void ShowSelectionHandlesAutomatically();
 
   void OnInsertionChanged();
   void OnSelectionChanged();
 
   void ActivateInsertion();
   void DeactivateInsertion();
   void ActivateSelection();
   void DeactivateSelection();
   void ResetCachedValuesIfInactive();
 
+  bool WillHandleTouchEventForLongPressDrag(const MotionEvent& event);
+  void SetTemporarilyHiddenForLongPressDrag(bool hidden);
+  void OnHandleVisibilityOverrideMaybeChanged();
+
   gfx::Vector2dF GetStartLineOffset() const;
   gfx::Vector2dF GetEndLineOffset() const;
   bool GetStartVisible() const;
   bool GetEndVisible() const;
   TouchHandle::AnimationStyle GetAnimationStyle(bool was_active) const;
 
   void LogSelectionEnd();
 
   TouchSelectionControllerClient* const client_;
   const base::TimeDelta tap_timeout_;
@@ skipping 17 matching lines @@
   scoped_ptr<TouchHandle> start_selection_handle_;
   scoped_ptr<TouchHandle> end_selection_handle_;
   bool is_selection_active_;
   bool activate_selection_automatically_;
 
   bool selection_empty_;
   bool selection_editable_;
 
   bool temporarily_hidden_;
 
+  // Offset from the start of a drag sequence to a reasonable position on the
+  // corresponding line of text. This helps ensure that the initial selection
+  // induced by the drag doesn't "jump" between lines.
+  gfx::Vector2dF drag_line_offset_;
+
+  // Longpress drag allows direct manipulation of longpress-initiated selection.
+  LongPressDragSelector longpress_drag_selector_;
+
   base::TimeTicks selection_start_time_;
   // Whether a selection handle was dragged during the current 'selection
   // session' - i.e. since the current selection has been activated.
   bool selection_handle_dragged_;
 
   DISALLOW_COPY_AND_ASSIGN(TouchSelectionController);
 };
 
 }  // namespace ui
 
 #endif  // UI_TOUCH_SELECTION_TOUCH_SELECTION_CONTROLLER_H_