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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef ASH_FAST_INK_FAST_INK_POINTER_CONTROLLER_H_
#define ASH_FAST_INK_FAST_INK_POINTER_CONTROLLER_H_
#include <set>
#include "base/time/time.h"
#include "ui/aura/window_tracker.h"
#include "ui/events/event_handler.h"
class PrefChangeRegistrar;
namespace aura {
class Window;
} // namespace aura
namespace ui {
class LocatedEvent;
} // namespace ui
namespace views {
class View;
} // namespace views
namespace ash {
// Base class for a fast ink based pointer controller. Enables/disables
// the pointer, receives points and passes them off to be rendered.
class FastInkPointerController : public ui::EventHandler {
public:
FastInkPointerController();
FastInkPointerController(const FastInkPointerController&) = delete;
FastInkPointerController& operator=(const FastInkPointerController&) = delete;
~FastInkPointerController() override;
bool is_enabled() const { return enabled_; }
// Enables/disables the pointer. The user still has to press to see
// the pointer.
virtual void SetEnabled(bool enabled);
// Add window that should be excluded from handling events.
void AddExcludedWindow(aura::Window* window);
protected:
// Returns the pointer view.
virtual views::View* GetPointerView() const = 0;
// Creates the pointer view.
virtual void CreatePointerView(base::TimeDelta presentation_delay,
aura::Window* root_window) = 0;
// Updates the pointer view.
virtual void UpdatePointerView(ui::TouchEvent* event) = 0;
virtual void UpdatePointerView(ui::MouseEvent* event) = 0;
// Destroys the pointer view if it exists.
virtual void DestroyPointerView();
// Whether the controller is ready to start handling a new gesture.
virtual bool CanStartNewGesture(ui::LocatedEvent* event);
// Whether the event should be processed and stop propagation.
// Default implementation will catch basic mouse events (e.g. mouse clicking)
// and touch events (e.g. touch pressing) and stop them from being further
// dispatched, so derived class should override it if the default behavior is
// not as expected. See b/191044469 as an example.
virtual bool ShouldProcessEvent(ui::LocatedEvent* event);
bool IsEnabledForMouseEvent() const;
// Return true if the location of the event is in one of the excluded windows.
bool IsPointerInExcludedWindows(ui::LocatedEvent* event);
private:
// Creates new pointer view if `can_start_new_gesture` is true. Otherwise, try
// to re-use existing one. Ends the current pointer session if the pointer
// widget is no longer valid. Returns true if there is a pointer view
// available.
bool MaybeCreatePointerView(ui::LocatedEvent* event,
bool can_start_new_gesture);
// ui::EventHandler:
void OnTouchEvent(ui::TouchEvent* event) override;
void OnMouseEvent(ui::MouseEvent* event) override;
void OnHasSeenStylusPrefChanged();
// The presentation delay used for pointer location prediction.
const base::TimeDelta presentation_delay_;
bool enabled_ = false;
bool has_seen_stylus_ = false;
std::optional<bool> pointer_view_created_by_touch_;
// Set of touch ids.
std::set<int> touch_ids_;
// If the pointer event is in the bound of any of the |excluded_windows_|.
// Skip processing the event.
aura::WindowTracker excluded_windows_;
std::unique_ptr<PrefChangeRegistrar> pref_change_registrar_local_;
};
} // namespace ash
#endif // ASH_FAST_INK_FAST_INK_POINTER_CONTROLLER_H_
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