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// 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 "ui/base/touch/selection_bound.h"
#include "ui/gfx/geometry/point_f.h"
#include "ui/gfx/geometry/rect_f.h"
#include "ui/touch_selection/selection_event_type.h"
#include "ui/touch_selection/touch_handle.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.
class UI_TOUCH_SELECTION_EXPORT TouchSelectionControllerClient {
public:
virtual ~TouchSelectionControllerClient() {}
virtual bool SupportsAnimation() const = 0;
virtual void SetNeedsAnimate() = 0;
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 void OnSelectionEvent(SelectionEventType event,
const gfx::PointF& position) = 0;
virtual scoped_ptr<TouchHandleDrawable> CreateDrawable() = 0;
};
// Controller for manipulating text selection via touch input.
class UI_TOUCH_SELECTION_EXPORT TouchSelectionController
: public TouchHandleClient {
public:
TouchSelectionController(TouchSelectionControllerClient* client,
base::TimeDelta tap_timeout,
float tap_slop);
~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);
// 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.
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();
// 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|.
void SetTemporarilyHidden(bool hidden);
// To be called when the editability of the focused region changes.
void OnSelectionEditable(bool editable);
// To be called when the contents of the focused region changes.
void OnSelectionEmpty(bool empty);
// Ticks an active animation, as requested to the client by |SetNeedsAnimate|.
// Returns true if an animation is active and requires further ticking.
bool Animate(base::TimeTicks animate_time);
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 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();
const gfx::PointF& GetStartPosition() const;
const gfx::PointF& GetEndPosition() const;
gfx::Vector2dF GetStartLineOffset() const;
gfx::Vector2dF GetEndLineOffset() const;
bool GetStartVisible() const;
bool GetEndVisible() const;
TouchHandle::AnimationStyle GetAnimationStyle(bool was_active) const;
TouchSelectionControllerClient* const client_;
const base::TimeDelta tap_timeout_;
const float tap_slop_;
InputEventType response_pending_input_event_;
SelectionBound start_;
SelectionBound end_;
TouchHandleOrientation start_orientation_;
TouchHandleOrientation end_orientation_;
scoped_ptr<TouchHandle> insertion_handle_;
bool is_insertion_active_;
bool activate_insertion_automatically_;
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_;
DISALLOW_COPY_AND_ASSIGN(TouchSelectionController);
};
} // namespace ui
#endif // UI_TOUCH_SELECTION_TOUCH_SELECTION_CONTROLLER_H_
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