1 // Copyright 2014 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef UI_BASE_ANDROID_SYSTEM_UI_RESOURCE_MANAGER_H_ 6 #define UI_BASE_ANDROID_SYSTEM_UI_RESOURCE_MANAGER_H_ 7 8 #include "cc/resources/ui_resource_client.h" 9 #include "ui/base/ui_base_export.h" 10 11 namespace ui { 12 13 // Interface for loading and accessing shared system UI resources. 14 class UI_BASE_EXPORT SystemUIResourceManager { 15 public: 16 enum ResourceType { 17 OVERSCROLL_EDGE = 0, 18 OVERSCROLL_GLOW, 19 OVERSCROLL_GLOW_L, 20 RESOURCE_TYPE_FIRST = OVERSCROLL_EDGE, 21 RESOURCE_TYPE_LAST = OVERSCROLL_GLOW_L 22 }; 23 24 virtual ~SystemUIResourceManager() {} 25 26 // Optionally trigger bitmap loading for a given |resource|, if necessary. 27 // Note that this operation may be asynchronous, and subsequent queries to 28 // |GetUIResourceId()| will yield a valid result only after loading finishes. 29 // This method is particularly useful for idly loading a resource before an 30 // explicit cc::UIResourceId is required. Repeated calls will be ignored. 31 virtual void PreloadResource(ResourceType resource) = 0; 32 33 // Return the resource id associated with |resource|. If loading hasn't yet 34 // begun for the given |resource|, it will be triggered immediately. If 35 // loading is asynchronous, 0 will be returned until loading has finished, and 36 // the caller is responsible for re-querying until a valid id is returned. 37 virtual cc::UIResourceId GetUIResourceId(ResourceType resource) = 0; 38 }; 39 40 } // namespace ui 41 42 #endif // UI_BASE_ANDROID_SYSTEM_UI_RESOURCE_MANAGER_H_ 43
