ui/gfx/native_widget_types.h

// 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_GFX_NATIVE_WIDGET_TYPES_H_
#define UI_GFX_NATIVE_WIDGET_TYPES_H_

#include <stdint.h>

#include "base/logging.h"
#include "build/build_config.h"

#if defined(OS_ANDROID)
#include <jni.h>
#elif defined(OS_MACOSX)
#include <objc/objc.h>
#endif

// This file provides cross platform typedefs for native widget types.
//   NativeWindow: this is a handle to a native, top-level window
//   NativeView: this is a handle to a native UI element. It may be the
//     same type as a NativeWindow on some platforms.
//   NativeViewId: Often, in our cross process model, we need to pass around a
//     reference to a "window". This reference will, say, be echoed back from a
//     renderer to the browser when it wishes to query its size. On Windows we
//     use an HWND for this.
//
//     As a rule of thumb - if you're in the renderer, you should be dealing
//     with NativeViewIds. This should remind you that you shouldn't be doing
//     direct operations on platform widgets from the renderer process.
//
//     If you're in the browser, you're probably dealing with NativeViews,
//     unless you're in the IPC layer, which will be translating between
//     NativeViewIds from the renderer and NativeViews.
//
//   NativeImage: The platform-specific image type used for drawing UI elements
//     in the browser.
//
// The name 'View' here meshes with OS X where the UI elements are called
// 'views' and with our Chrome UI code where the elements are also called
// 'views'.

#if defined(USE_AURA)
namespace aura {
class Window;
}
namespace ui {
class Cursor;
enum class CursorType;
class Event;
}
#endif  // defined(USE_AURA)

#if defined(OS_WIN)
#include <windows.h>  // NOLINT
typedef struct HFONT__* HFONT;
struct IAccessible;
#elif defined(OS_IOS)
struct CGContext;
#ifdef __OBJC__
@class UIEvent;
@class UIFont;
@class UIImage;
@class UIView;
@class UIWindow;
@class UITextField;
#else
class UIEvent;
class UIFont;
class UIImage;
class UIView;
class UIWindow;
class UITextField;
#endif  // __OBJC__
#elif defined(OS_MACOSX)
struct CGContext;
#ifdef __OBJC__
@class NSCursor;
@class NSEvent;
@class NSFont;
@class NSImage;
@class NSView;
@class NSWindow;
@class NSTextField;
#else
class NSCursor;
class NSEvent;
class NSFont;
class NSImage;
struct NSView;
class NSWindow;
class NSTextField;
#endif  // __OBJC__
#elif defined(OS_POSIX)
typedef struct _cairo cairo_t;
#endif

#if defined(OS_ANDROID)
struct ANativeWindow;
namespace ui {
class WindowAndroid;
class ViewAndroid;
}
#endif
class SkBitmap;

#if defined(USE_X11) && !defined(OS_CHROMEOS)
extern "C" {
struct _AtkObject;
typedef struct _AtkObject AtkObject;
}
#endif

namespace gfx {

#if defined(USE_AURA)
typedef ui::Cursor NativeCursor;
typedef aura::Window* NativeView;
typedef aura::Window* NativeWindow;
typedef ui::Event* NativeEvent;
#elif defined(OS_IOS)
typedef void* NativeCursor;
typedef UIView* NativeView;
typedef UIWindow* NativeWindow;
typedef UIEvent* NativeEvent;
#elif defined(OS_MACOSX)
typedef NSCursor* NativeCursor;
typedef NSView* NativeView;
typedef NSWindow* NativeWindow;
typedef NSEvent* NativeEvent;
#elif defined(OS_ANDROID)
typedef void* NativeCursor;
typedef ui::ViewAndroid* NativeView;
typedef ui::WindowAndroid* NativeWindow;
typedef jobject NativeEvent;
#elif defined(OS_FUCHSIA)
// TODO(fuchsia): Update when we have a plan for UI on Fuchsia.
typedef void* NativeCursor;
typedef void* NativeView;
typedef void* NativeWindow;
typedef void* NativeEvent;
#else
#error Unknown build environment.
#endif

#if defined(OS_WIN)
typedef HFONT NativeFont;
typedef IAccessible* NativeViewAccessible;
#elif defined(OS_IOS)
typedef UIFont* NativeFont;
typedef id NativeViewAccessible;
#elif defined(OS_MACOSX)
typedef NSFont* NativeFont;
typedef id NativeViewAccessible;
#else  // Android, Linux, Chrome OS, etc.
// Linux doesn't have a native font type.
#if defined(USE_X11) && !defined(OS_CHROMEOS)
typedef AtkObject* NativeViewAccessible;
#else
typedef void* NativeViewAccessible;
#endif
#endif

// A constant value to indicate that gfx::NativeCursor refers to no cursor.
#if defined(USE_AURA)
const ui::CursorType kNullCursor = static_cast<ui::CursorType>(0);
#else
const gfx::NativeCursor kNullCursor = static_cast<gfx::NativeCursor>(NULL);
#endif

#if defined(OS_IOS)
typedef UIImage NativeImageType;
#elif defined(OS_MACOSX)
typedef NSImage NativeImageType;
#else
typedef SkBitmap NativeImageType;
#endif
typedef NativeImageType* NativeImage;

// Note: for test_shell we're packing a pointer into the NativeViewId. So, if
// you make it a type which is smaller than a pointer, you have to fix
// test_shell.
//
// See comment at the top of the file for usage.
typedef intptr_t NativeViewId;

// AcceleratedWidget provides a surface to compositors to paint pixels.
#if defined(OS_WIN)
typedef HWND AcceleratedWidget;
constexpr AcceleratedWidget kNullAcceleratedWidget = NULL;
#elif defined(USE_X11)
typedef unsigned long AcceleratedWidget;
constexpr AcceleratedWidget kNullAcceleratedWidget = 0;
#elif defined(OS_IOS)
typedef UIView* AcceleratedWidget;
constexpr AcceleratedWidget kNullAcceleratedWidget = 0;
#elif defined(OS_MACOSX)
typedef NSView* AcceleratedWidget;
constexpr AcceleratedWidget kNullAcceleratedWidget = 0;
#elif defined(OS_ANDROID)
typedef ANativeWindow* AcceleratedWidget;
constexpr AcceleratedWidget kNullAcceleratedWidget = 0;
#elif defined(USE_OZONE)
typedef int32_t AcceleratedWidget;
constexpr AcceleratedWidget kNullAcceleratedWidget = 0;
#elif defined(OS_FUCHSIA)
// TODO(fuchsia): Update when we have a plan for UI on Fuchsia.
typedef void* AcceleratedWidget;
constexpr AcceleratedWidget kNullAcceleratedWidget = 0;
#else
#error unknown platform
#endif

}  // namespace gfx

#endif  // UI_GFX_NATIVE_WIDGET_TYPES_H_