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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.
#include "base/macros.h"
#include "base/time/time.h"
#include "ui/gfx/geometry/point_f.h"
#include "ui/gfx/geometry/rect_f.h"
#include "ui/gfx/geometry/vector2d_f.h"
#include "ui/gfx/selection_bound.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.
class UI_TOUCH_SELECTION_EXPORT TouchSelectionControllerClient {
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) = 0;
virtual std::unique_ptr<TouchHandleDrawable> CreateDrawable() = 0;
virtual void DidScroll() = 0;
// Controller for manipulating text selection via touch input.
class UI_TOUCH_SELECTION_EXPORT TouchSelectionController
: public TouchHandleClient,
public LongPressDragSelectorClient {
enum ActiveStatus {
// 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;
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 gfx::SelectionBound& start,
const gfx::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.
// |tap_count| is tap index in a repeated sequence, i.e., 1 for the first
// tap, 2 for the second tap, etc...
void HandleTapEvent(const gfx::PointF& location, int tap_count);
// To be called before forwarding a longpress event.
void HandleLongPressEvent(base::TimeTicks event_time,
const gfx::PointF& location);
// To be called before forwarding a gesture scroll begin event to prevent
// long-press drag.
void OnScrollBeginEvent();
// 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);
// 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);
// Returns the rect between the two active selection bounds. If just one of
// the bounds is visible, the rect is simply the (one-dimensional) rect of
// that bound. If no selection is active, an empty rect will be returned.
gfx::RectF GetRectBetweenBounds() const;
// Returns the visible rect of specified touch handle. For an active insertion
// these values will be identical.
gfx::RectF GetStartHandleRect() const;
gfx::RectF GetEndHandleRect() const;
// Returns the middle point of selection bound corresponding to the active
// selection or insertion handle. If there is no active handle, returns (0,0).
gfx::PointF GetActiveHandleBoundPoint() const;
// 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;
const gfx::SelectionBound& start() const { return start_; }
const gfx::SelectionBound& end() const { return end_; }
ActiveStatus active_status() const { return active_status_; }
friend class TouchSelectionControllerTestApi;
bool WillHandleTouchEventImpl(const MotionEvent& event);
// TouchHandleClient implementation.
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;
std::unique_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 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 UpdateHandleLayoutIfNecessary();
bool WillHandleTouchEventForLongPressDrag(const MotionEvent& event);
void SetTemporarilyHiddenForLongPressDrag(bool hidden);
void RefreshHandleVisibility();
void HideHandles();
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 Config config_;
InputEventType response_pending_input_event_;
gfx::SelectionBound start_;
gfx::SelectionBound end_;
TouchHandleOrientation start_orientation_;
TouchHandleOrientation end_orientation_;
ActiveStatus active_status_;
std::unique_ptr<TouchHandle> insertion_handle_;
std::unique_ptr<TouchHandle> start_selection_handle_;
std::unique_ptr<TouchHandle> end_selection_handle_;
bool temporarily_hidden_;
// 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_;
// Determines whether the entire touch sequence should be consumed or not.
bool consume_touch_sequence_;
bool show_touch_handles_;
} // namespace ui