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// Copyright 2021 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 UI_VIEWS_CASCADING_PROPERTY_H_
#define UI_VIEWS_CASCADING_PROPERTY_H_
#include <memory>
#include "third_party/abseil-cpp/absl/types/optional.h"
#include "third_party/skia/include/core/SkColor.h"
#include "ui/base/class_property.h"
#include "ui/color/color_id.h"
#include "ui/views/view.h"
#include "ui/views/views_export.h"
namespace views {
class View;
template <typename T>
class CascadingProperty {
public:
CascadingProperty() = default;
CascadingProperty(const CascadingProperty&) = delete;
CascadingProperty& operator=(const CascadingProperty&) = delete;
virtual ~CascadingProperty() = default;
virtual T GetValue(const View* view) const = 0;
};
template <typename T>
const CascadingProperty<T>* GetCascadingPropertyObject(
View* view,
const ui::ClassProperty<CascadingProperty<T>*>* property_key) {
const CascadingProperty<T>* property = view->GetProperty(property_key);
if (property != nullptr)
return property;
if (!view->parent())
return nullptr;
return GetCascadingPropertyObject(view->parent(), property_key);
}
template <typename T>
absl::optional<T> GetCascadingProperty(
View* view,
const ui::ClassProperty<CascadingProperty<T>*>* property_key) {
const CascadingProperty<T>* property =
GetCascadingPropertyObject(view, property_key);
return property ? absl::optional<T>(property->GetValue(view)) : absl::nullopt;
}
template <typename T, typename K>
void SetCascadingProperty(
View* view,
const ui::ClassProperty<CascadingProperty<T>*>* property_key,
std::unique_ptr<K> property) {
// TODO(pbos): See if there could be a way to (D)CHECK that property_key is
// actually owned.
view->SetProperty(property_key,
static_cast<CascadingProperty<T>*>(property.release()));
}
VIEWS_EXPORT void SetCascadingColorProviderColor(
View* view,
const ui::ClassProperty<CascadingProperty<SkColor>*>* property_key,
ui::ColorId color_id);
VIEWS_EXPORT extern const ui::ClassProperty<CascadingProperty<SkColor>*>* const
kCascadingBackgroundColor;
VIEWS_EXPORT SkColor GetCascadingBackgroundColor(View* view);
VIEWS_EXPORT SkColor GetCascadingAccentColor(View* view);
} // namespace views
DECLARE_EXPORTED_UI_CLASS_PROPERTY_TYPE(VIEWS_EXPORT,
views::CascadingProperty<SkColor>*)
#endif // UI_VIEWS_CASCADING_PROPERTY_H_
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