1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
// Copyright 2023 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_STYLE_BLURRED_BACKGROUND_SHIELD_H_
#define ASH_STYLE_BLURRED_BACKGROUND_SHIELD_H_
#include <variant>
#include "ash/ash_export.h"
#include "base/scoped_observation.h"
#include "ui/color/color_id.h"
#include "ui/color/color_variant.h"
#include "ui/compositor/layer.h"
#include "ui/gfx/geometry/rounded_corners_f.h"
#include "ui/views/view_observer.h"
namespace views {
class View;
} // namespace views
namespace ash {
// `BlurredBackgroundShield` holds a rounded rect solid color layer with
// background blur. It can be used as the blurred background of a view without
// clipping the contents of the view and its children. The background layer is
// always below the view's layer and has the same size of the view. When a
// dynamic color ID is set, the background color will be updated on theme
// change.
class ASH_EXPORT BlurredBackgroundShield : public views::ViewObserver {
public:
// When `add_layer_to_region` is true, the background layer will be added to
// the view by `View::AddLayerToRegion` with region below. However, in rare
// cases, the host view's `AddLayerToRegion` is overridden such that the layer
// may not be below the view's layer, e.g., `views::LabelButton`. In these
// cases, the `add_layer_to_region` should be set to false and the background
// layer will manually be located under the view's layer.
BlurredBackgroundShield(views::View* host,
ui::ColorVariant color,
float blur_sigma,
const gfx::RoundedCornersF& rounded_corners,
bool add_layer_to_region = true);
BlurredBackgroundShield(const BlurredBackgroundShield&) = delete;
BlurredBackgroundShield& operator=(const BlurredBackgroundShield&) = delete;
~BlurredBackgroundShield() override;
void SetColor(ui::ColorVariant color);
// views::ViewObserver:
void OnViewAddedToWidget(views::View* observed_view) override;
void OnViewVisibilityChanged(views::View* observed_view,
views::View* starting_view) override;
void OnViewLayerBoundsSet(views::View* observed_view) override;
void OnViewThemeChanged(views::View* observed_view) override;
private:
void StackLayerBelowHost();
void UpdateBackgroundColor();
ui::Layer background_layer_ = ui::Layer(ui::LAYER_SOLID_COLOR);
const raw_ptr<views::View> host_;
ui::ColorVariant color_;
const float blur_sigma_;
// If the background layer should be added to the view's region below.
const bool add_layer_to_region_;
base::ScopedObservation<views::View, views::ViewObserver> host_observation_{
this};
};
} // namespace ash
#endif // ASH_STYLE_BLURRED_BACKGROUND_SHIELD_H_
|
