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// Copyright (c) 2018 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 <map>
#include <memory>
#include "chromecast/graphics/accessibility/magnification_controller.h"
#include "ui/compositor/layer_delegate.h"
#include "ui/events/event_handler.h"
#include "ui/events/event_rewriter.h"
#include "ui/events/gestures/gesture_provider_aura.h"
#include "ui/events/gestures/gesture_types.h"
#include "ui/gfx/geometry/point.h"
#include "ui/gfx/transform.h"
namespace aura {
class Window;
} // namespace aura
namespace ui {
class GestureProviderAura;
class Layer;
} // namespace ui
namespace chromecast {
class CastGestureHandler;
class FullscreenMagnificationController : public MagnificationController,
public ui::EventRewriter,
public ui::GestureConsumer,
public ui::LayerDelegate {
explicit FullscreenMagnificationController(
aura::Window* root_window,
CastGestureHandler* cast_gesture_handler);
~FullscreenMagnificationController() override;
void SetEnabled(bool enabled) override;
bool IsEnabled() const override;
void SetMagnificationScale(float magnification_scale) override;
class GestureProviderClient;
enum LockedGestureType { NO_GESTURE, ZOOM, SCROLL };
// The current transform to apply to the root window to perform magnification.
gfx::Transform GetMagnifierTransform() const;
// Process pending gestures in |gesture_provider_|. This method returns true
// if the controller needs to cancel existing touches.
bool ProcessGestures();
// Redraws the magnification window with the given origin position in dip and
// the given scale. Returns true if the window is changed; otherwise, false.
bool RedrawDIP(const gfx::PointF& position_in_dip, float scale);
// Overridden from ui::EventRewriter
ui::EventDispatchDetails RewriteEvent(
const ui::Event& event,
const Continuation continuation) override;
// Adds the layer for the highlight-ring which provides a visual indicator
// that magnification is enabled.
void UpdateHighlightLayerTransform(const gfx::Transform& magnifier_transform);
void AddHighlightLayer();
// ui::LayerDelegate overrides:
void OnPaintLayer(const ui::PaintContext& context) override;
void OnDeviceScaleFactorChanged(float old_device_scale_factor,
float new_device_scale_factor) override;
aura::Window* root_window_;
bool is_enabled_ = false;
gfx::Transform original_transform_;
// Stores the last touched location. This value is used on zooming to keep
// this location visible.
gfx::Point point_of_interest_in_root_;
// Current scale, origin (left-top) position of the magnification window.
float magnification_scale_;
gfx::PointF magnification_origin_;
float original_magnification_scale_;
gfx::PointF original_magnification_origin_;
// We own our own GestureProvider to detect gestures with screen coordinates
// of touch events. As MagnificationController changes zoom level and moves
// viewport, logical coordinates of touches cannot be used for gesture
// detection as they are changed if the controller reacts to gestures.
std::unique_ptr<ui::GestureProviderAura> gesture_provider_;
std::unique_ptr<GestureProviderClient> gesture_provider_client_;
// We lock the gesture once user performs either scroll or pinch gesture above
// those thresholds.
LockedGestureType locked_gesture_ = NO_GESTURE;
// If true, consumes all touch events.
bool consume_touch_event_ = false;
// Number of touch points on the screen.
int32_t touch_points_ = 0;
// Map for holding ET_TOUCH_PRESS events. Those events are used to dispatch
// ET_TOUCH_CANCELLED events. Events will be removed from this map when press
// events are cancelled, i.e. size of this map can be different from number of
// touches on the screen. Key is pointer id.
std::map<int32_t, std::unique_ptr<ui::TouchEvent>> press_event_map_;
CastGestureHandler* cast_gesture_handler_;
std::unique_ptr<ui::Layer> highlight_ring_layer_;
} // namespace chromecast