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// Copyright 2014 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_BASE_ANDROID_SYSTEM_UI_RESOURCE_MANAGER_H_
#define UI_BASE_ANDROID_SYSTEM_UI_RESOURCE_MANAGER_H_
#include "cc/resources/ui_resource_client.h"
#include "ui/base/ui_base_export.h"
namespace ui {
// Interface for loading and accessing shared system UI resources.
class UI_BASE_EXPORT SystemUIResourceManager {
public:
enum ResourceType {
OVERSCROLL_EDGE = 0,
OVERSCROLL_GLOW,
RESOURCE_TYPE_FIRST = OVERSCROLL_EDGE,
RESOURCE_TYPE_LAST = OVERSCROLL_GLOW
};
virtual ~SystemUIResourceManager() {}
// Optionally trigger bitmap loading for a given |resource|, if necessary.
// Note that this operation may be asynchronous, and subsequent queries to
// |GetUIResourceId()| will yield a valid result only after loading finishes.
// This method is particularly useful for idly loading a resource before an
// explicit cc::UIResourceId is required. Repeated calls will be ignored.
virtual void PreloadResource(ResourceType resource) = 0;
// Return the resource id associated with |resource|. If loading hasn't yet
// begun for the given |resource|, it will be triggered immediately. If
// loading is asynchronous, 0 will be returned until loading has finished, and
// the caller is responsible for re-querying until a valid id is returned.
virtual cc::UIResourceId GetUIResourceId(ResourceType resource) = 0;
};
} // namespace ui
#endif // UI_BASE_ANDROID_SYSTEM_UI_RESOURCE_MANAGER_H_
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