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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROMEOS_UI_FRAME_HIGHLIGHT_BORDER_OVERLAY_H_
#define CHROMEOS_UI_FRAME_HIGHLIGHT_BORDER_OVERLAY_H_
#include "ui/aura/window_observer.h"
#include "ui/compositor/layer.h"
#include "ui/display/display_observer.h"
#include "ui/display/tablet_state.h"
namespace gfx {
class Canvas;
} // namespace gfx
namespace views {
class Widget;
} // namespace views
// `HighlightBorderOverlay` is mainly used to add highlight border on the
// windows whose client area spans the entire width of the widget. To prevent
// the border from being covered by the client view, the class creates a nine
// patch layer painted with a highlight border and overlay on the widget. The
// inner border covers on the window contents and outer border is outside the
// window. It uses `kHighlightBorder3` as its border type which has low opacity
// of outer border.
class HighlightBorderOverlay : public aura::WindowObserver,
public display::DisplayObserver {
public:
explicit HighlightBorderOverlay(views::Widget* widget);
HighlightBorderOverlay(const HighlightBorderOverlay&) = delete;
HighlightBorderOverlay& operator=(const HighlightBorderOverlay&) = delete;
~HighlightBorderOverlay() override;
// Calculate image source size according to rounded corner radius and border
// thickness.
gfx::Size CalculateImageSourceSize() const;
// aura::WindowObserver:
void OnWindowBoundsChanged(aura::Window* window,
const gfx::Rect& old_bounds,
const gfx::Rect& new_bounds,
ui::PropertyChangeReason reason) override;
void OnWindowPropertyChanged(aura::Window* window,
const void* key,
intptr_t old) override;
void OnWindowDestroying(aura::Window* window) override;
// display::DisplayObserver:
void OnDisplayTabletStateChanged(display::TabletState state) override;
private:
// Calculate the painting region of border.
gfx::Insets CalculateBorderRegion() const;
// Update layer visibility and bounds according to current window bounds and
// work area.
void UpdateLayerVisibilityAndBounds();
// Update the nine patch layer with current highlight border settings.
void UpdateNinePatchLayer();
ui::Layer layer_;
raw_ptr<views::Widget> widget_;
raw_ptr<aura::Window> window_;
int rounded_corner_radius_ = 0;
display::ScopedDisplayObserver display_observer_{this};
};
#endif // CHROMEOS_UI_FRAME_HIGHLIGHT_BORDER_OVERLAY_H_
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