Support for Adaptive Handle Orientation

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"
@@ skipping 38 matching lines @@
   struct UI_TOUCH_SELECTION_EXPORT Config {
     Config();
     ~Config();
 
     // Maximum allowed time for handle tap detection. Defaults to 300 ms.
     base::TimeDelta max_tap_duration;
 
     // Defaults to 8 DIPs.
     float tap_slop;
 
+    // Controls whether adaptive orientation for selection handles is enabled.
+    // Defaults to false.
+    bool enable_adaptive_handle_orientation;
+
     // Controls whether drag selection after a longpress is enabled.
     // Defaults to false.
     bool enable_longpress_drag_selection;
 
     // Controls whether an insertion handle is shown on a tap for an empty
     // editable text. Defauls to false.
     bool show_on_tap_for_empty_editable;
   };
 
   TouchSelectionController(TouchSelectionControllerClient* client,
                            const Config& config);
   ~TouchSelectionController() override;
 
   // To be called when the selection bounds have changed.
   // Note that such updates will trigger handle updates only if preceded
   // by an appropriate call to allow automatic showing.
   void OnSelectionBoundsChanged(const SelectionBound& start,
                                 const SelectionBound& end);
 
+  // To be called when the viewport rect has been changed. This is used for
+  // setting the state of the handles.
+  void OnViewportChanged(const gfx::RectF viewport_rect);
+
   // Allows touch-dragging of the handle.
   // 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.
   // |tap_count| is tap index in a repeated sequence, i.e., 1 for the first
   // tap, 2 for the second tap, etc...
   bool WillHandleTapEvent(const gfx::PointF& location, int tap_count);
@@ skipping 53 matching lines @@
   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;
   bool IsWithinTapSlop(const gfx::Vector2dF& delta) const override;
   void OnHandleTapped(const TouchHandle& handle) override;
   void SetNeedsAnimate() override;
   scoped_ptr<TouchHandleDrawable> CreateDrawable() override;
   base::TimeDelta GetMaxTapDuration() const override;
+  bool IsAdaptiveHandleOrientationEnabled() const override;
 
   // LongPressDragSelectorClient implementation.
   void OnLongPressDragActiveStateChanged() override;
   gfx::PointF GetSelectionStart() const override;
   gfx::PointF GetSelectionEnd() const override;
 
   void ShowInsertionHandleAutomatically();
   void ShowSelectionHandlesAutomatically();
   bool WillHandleTapOrLongPress(const gfx::PointF& location);
 
   void OnInsertionChanged();
   void OnSelectionChanged();
 
   // Returns true if insertion mode was newly (re)activated.
   bool ActivateInsertionIfNecessary();
   void DeactivateInsertion();
   // Returns true if selection mode was newly (re)activated.
   bool ActivateSelectionIfNecessary();
   void DeactivateSelection();
   void ForceNextUpdateIfInactive();
+  void UpdateHandleLayoutIfNecessary();
 
   bool WillHandleTouchEventForLongPressDrag(const MotionEvent& event);
   void SetTemporarilyHiddenForLongPressDrag(bool hidden);
   void RefreshHandleVisibility();
 
   gfx::Vector2dF GetStartLineOffset() const;
   gfx::Vector2dF GetEndLineOffset() const;
   bool GetStartVisible() const;
   bool GetEndVisible() const;
   TouchHandle::AnimationStyle GetAnimationStyle(bool was_active) const;
@@ skipping 30 matching lines @@
 
   // Whether to use the start bound (if false, the end bound) for computing the
   // appropriate text line offset when performing a selection drag. This helps
   // ensure that the initial selection induced by the drag doesn't "jump"
   // between lines.
   bool anchor_drag_to_selection_start_;
 
   // Longpress drag allows direct manipulation of longpress-initiated selection.
   LongPressDragSelector longpress_drag_selector_;
 
+  gfx::RectF viewport_rect_;
+
   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_