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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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