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// Copyright (c) 2012 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_THEME_PROVIDER_H_
#define UI_BASE_THEME_PROVIDER_H_
#include "base/basictypes.h"
#include "third_party/skia/include/core/SkColor.h"
#include "ui/base/layout.h"
#include "ui/base/ui_export.h"
#if defined(OS_MACOSX)
#ifdef __OBJC__
@class NSColor;
@class NSGradient;
@class NSImage;
#else
class NSColor;
class NSGradient;
class NSImage;
#endif // __OBJC__
#elif !defined(OS_WIN)
typedef struct _GdkColor GdkColor;
typedef struct _GdkPixbuf GdkPixbuf;
#endif // OS_*
class SkBitmap;
namespace base {
class RefCountedMemory;
}
namespace gfx {
class ImageSkia;
}
namespace ui {
////////////////////////////////////////////////////////////////////////////////
//
// 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 UI_EXPORT 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).
// TODO(pkotwicz): Get rid of GetBitmapNamed once all code uses
// GetImageSkiaNamed.
virtual SkBitmap* GetBitmapNamed(int id) const = 0;
// Get the image specified by |id|. An implementation of ThemeProvider should
// have its own source of ids (e.g. an enum, or external resource bundle).
virtual gfx::ImageSkia* GetImageSkiaNamed(int id) const = 0;
// Get the color specified by |id|.
virtual SkColor GetColor(int id) const = 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) const = 0;
// Whether we should use the native system frame (typically Aero glass) or
// a custom frame.
virtual bool ShouldUseNativeFrame() const = 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) const = 0;
// Reads the image data from the theme file into the specified vector. Only
// valid for un-themed resources and the themed IDR_THEME_NTP_* in most
// implementations of ThemeProvider. Returns NULL on error.
virtual base::RefCountedMemory* GetRawData(
int id,
ui::ScaleFactor scale_factor) const = 0;
#if defined(OS_MACOSX) && !defined(TOOLKIT_VIEWS)
// Gets the NSImage with the specified |id|.
//
// The bitmap is not assumed to exist. If a theme does not provide an image,
// if |allow_default| is true, then the default image will be returned, else
// this function will return nil.
virtual NSImage* GetNSImageNamed(int id, bool allow_default) const = 0;
// Gets the NSImage that GetNSImageNamed (above) would return, but returns it
// as a pattern color.
virtual NSColor* GetNSImageColorNamed(int id, bool allow_default) const = 0;
// Gets the NSColor with the specified |id|.
//
// The color is not assumed to exist. If a theme does not provide an color, if
// |allow_default| is true, then the default color will be returned, else this
// function will return nil.
virtual NSColor* GetNSColor(int id, bool allow_default) const = 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, if |allow_default| is true, then the default tint will be
// returned, else this function will return nil.
virtual NSColor* GetNSColorTint(int id, bool allow_default) const = 0;
// Gets the NSGradient with the specified |id|.
virtual NSGradient* GetNSGradient(int id) const = 0;
#elif defined(OS_POSIX) && !defined(TOOLKIT_VIEWS) && !defined(OS_ANDROID)
// 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.
// As above, but flips it in RTL locales.
virtual GdkPixbuf* GetRTLEnabledPixbufNamed(int id) const = 0;
#endif
};
} // namespace ui
#endif // UI_BASE_THEME_PROVIDER_H_
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