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// Copyright (c) 2009 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 APP_THEME_PROVIDER_H_
#define APP_THEME_PROVIDER_H_
#include "base/basictypes.h"
#include "third_party/skia/include/core/SkColor.h"
#if defined(OS_LINUX)
#include <gdk/gdk.h>
#elif defined(OS_MACOSX)
#ifdef __OBJC__
@class NSColor;
@class NSImage;
#else
class NSColor;
class NSImage;
#endif // __OBJC__
#endif // OS_*
class SkBitmap;
////////////////////////////////////////////////////////////////////////////////
//
// ThemeProvider
//
// ThemeProvider is an abstract class that defines the API that should be
// implemented to provide bitmaps and color information for a given theme.
//
////////////////////////////////////////////////////////////////////////////////
class ThemeProvider {
public:
virtual ~ThemeProvider();
// Get the bitmap specified by |id|. An implementation of ThemeProvider should
// have its own source of ids (e.g. an enum, or external resource bundle).
virtual SkBitmap* GetBitmapNamed(int id) = 0;
// Get the color specified by |id|.
virtual SkColor GetColor(int id) = 0;
// Get the property (e.g. an alignment expressed in an enum, or a width or
// height) specified by |id|.
virtual bool GetDisplayProperty(int id, int* result) = 0;
// Whether we should use the native system frame (typically Aero glass) or
// a custom frame.
virtual bool ShouldUseNativeFrame() = 0;
// Whether or not we have a certain image. Used for when the default theme
// doesn't provide a certain image, but custom themes might (badges, etc).
virtual bool HasCustomImage(int id) = 0;
#if defined(OS_LINUX) && !defined(TOOLKIT_VIEWS)
// Gets the GdkPixbuf with the specified |id|. Returns a pointer to a shared
// instance of the GdkPixbuf. This shared GdkPixbuf is owned by the theme
// provider and should not be freed.
//
// The bitmap is assumed to exist. This function will log in release, and
// assert in debug mode if it does not. On failure, this will return a
// pointer to a shared empty placeholder bitmap so it will be visible what
// is missing.
virtual GdkPixbuf* GetPixbufNamed(int id) = 0;
// As above, but flips it in RTL locales.
virtual GdkPixbuf* GetRTLEnabledPixbufNamed(int id) = 0;
#elif defined(OS_MACOSX)
// Gets the NSImage with the specified |id|.
//
// The bitmap is not assumed to exist. If a theme does not provide an image,
// this function will return nil.
virtual NSImage* GetNSImageNamed(int id) = 0;
// Gets the NSColor for tinting with the specified |id|.
//
// The tint is not assumed to exist. If a theme does not provide a tint with
// that id, this function will return nil.
virtual NSColor* GetNSColorTint(int id) = 0;
#endif
};
#endif // APP_THEME_PROVIDER_H_
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