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// Copyright 2020 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.
#ifndef ASH_MAGNIFIER_MAGNIFIER_GLASS_H_
#define ASH_MAGNIFIER_MAGNIFIER_GLASS_H_
#include <memory>
#include "ash/ash_export.h"
#include "ui/aura/window.h"
#include "ui/aura/window_observer.h"
#include "ui/gfx/shadow_value.h"
#include "ui/views/widget/widget_observer.h"
namespace gfx {
class Point;
}
namespace ui {
class Layer;
}
namespace ash {
// Shows a magnifier glass at a specified location.
class ASH_EXPORT MagnifierGlass : public aura::WindowObserver,
public views::WidgetObserver {
public:
struct Params {
// Ratio of magnifier scale.
float scale = 2.f;
// Radius of the magnifying glass in DIP.
int radius = 64;
// Size of the border around the magnifying glass in DIP.
int border_size = 10;
// Thickness of the outline around magnifying glass border in DIP.
int border_outline_thickness = 1;
// The color of the border and its outlines. The border has an outline on
// both sides, producing a black/white/black ring.
SkColor border_color = SkColorSetARGB(204, 255, 255, 255);
SkColor border_outline_color = SkColorSetARGB(51, 0, 0, 0);
// The shadow values for the border.
gfx::ShadowValue bottom_shadow =
gfx::ShadowValue(gfx::Vector2d(0, 24), 24, SkColorSetARGB(61, 0, 0, 0));
gfx::ShadowValue top_shadow =
gfx::ShadowValue(gfx::Vector2d(0, 0), 24, SkColorSetARGB(26, 0, 0, 0));
};
explicit MagnifierGlass(Params params);
MagnifierGlass(const MagnifierGlass& other) = delete;
MagnifierGlass& operator=(const MagnifierGlass& other) = delete;
~MagnifierGlass() override;
// Shows the magnifier glass centered at |location_in_root| for |root_window|.
void ShowFor(aura::Window* root_window, const gfx::Point& location_in_root);
// Closes the magnifier glass widget.
void Close();
views::Widget* host_widget_for_testing() const { return host_widget_; }
private:
friend class PartialMagnificationControllerTestApi;
class BorderRenderer;
// aura::WindowObserver:
void OnWindowDestroying(aura::Window* window) override;
// views::WidgetObserver:
void OnWidgetDestroying(views::Widget* widget) override;
// Create or close the magnifier window.
void CreateMagnifierWindow(aura::Window* root_window,
const gfx::Point& point_in_root);
void CloseMagnifierWindow();
// Removes this as an observer of the zoom widget and the root window.
void RemoveZoomWidgetObservers();
const Params params_;
// The host widget is the root parent for all of the layers. The widget's
// location follows the mouse, which causes the layers to also move.
views::Widget* host_widget_ = nullptr;
// Draws the background with a zoom filter applied.
std::unique_ptr<ui::Layer> zoom_layer_;
// Draws an outline that is overlaid on top of |zoom_layer_|.
std::unique_ptr<ui::Layer> border_layer_;
// Draws a multicolored black/white/black border on top of |border_layer_|.
// Also draws a shadow around the border. This must be ordered after
// |border_layer_| so that it gets destroyed after |border_layer_|, otherwise
// |border_layer_| will have a pointer to a deleted delegate.
std::unique_ptr<BorderRenderer> border_renderer_;
};
} // namespace ash
#endif // ASH_MAGNIFIER_MAGNIFIER_GLASS_H_