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// Copyright 2020 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_DISPLAY_DISPLAY_HIGHLIGHT_CONTROLLER_H_
#define ASH_DISPLAY_DISPLAY_HIGHLIGHT_CONTROLLER_H_
#include "ash/ash_export.h"
#include "ash/display/window_tree_host_manager.h"
#include "ash/public/cpp/session/session_observer.h"
#include "ui/views/widget/widget.h"
namespace ash {
// DisplayHighlightController manages which display should render display
// identification highlights. Highlights are translucent blue rectangles on the
// edges of a display.
// TODO(1091497): Consider combining DisplayHighlightController and
// DisplayAlignmentController.
class ASH_EXPORT DisplayHighlightController
: public WindowTreeHostManager::Observer,
public SessionObserver {
public:
DisplayHighlightController();
~DisplayHighlightController() override;
// Sets the display to render the highlights on. To remove a currently-active
// highlight, pass display::kInvalidDisplayId as |display_id|.
void SetHighlightedDisplay(int64_t display_id);
views::Widget* GetWidgetForTesting() { return highlight_widget_.get(); }
private:
// WindowTreeHostManager::Observer:
void OnDisplayConfigurationChanged() override;
void OnDisplaysInitialized() override;
// SessionObserver:
void OnLockStateChanged(bool locked) override;
// Updates |highlight_| with new selected display.
void UpdateDisplayIdentificationHighlight();
// Widget used to render a blue highlight on the border of the specified
// display.
std::unique_ptr<views::Widget> highlight_widget_;
int64_t selected_display_id_ = display::kInvalidDisplayId;
// Tracks if the screen is locked in order to remove the highlight when screen
// locks and show it when it unlocks.
bool is_locked_;
};
} // namespace ash
#endif // ASH_DISPLAY_DISPLAY_HIGHLIGHT_CONTROLLER_H_
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