// 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_WIN_HWND_UTIL_H_
#define UI_GFX_WIN_HWND_UTIL_H_
#include <windows.h>
#include "base/strings/string16.h"
#include "ui/gfx/gfx_export.h"
namespace gfx {
class Point;
class Size;
// A version of the GetClassNameW API that returns the class name in an
// base::string16. An empty result indicates a failure to get the class name.
GFX_EXPORT base::string16 GetClassName(HWND hwnd);
// Useful for subclassing a HWND. Returns the previous window procedure.
GFX_EXPORT WNDPROC SetWindowProc(HWND hwnd, WNDPROC wndproc);
// Pointer-friendly wrappers around Get/SetWindowLong(..., GWLP_USERDATA, ...)
// Returns the previously set value.
GFX_EXPORT void* SetWindowUserData(HWND hwnd, void* user_data);
GFX_EXPORT void* GetWindowUserData(HWND hwnd);
// Returns true if the specified window is the current active top window or one
// of its children.
GFX_EXPORT bool DoesWindowBelongToActiveWindow(HWND window);
// Sizes the window to have a window size of |pref|, then centers the window
// over |parent|, ensuring the window fits on screen.
GFX_EXPORT void CenterAndSizeWindow(HWND parent,
HWND window,
const gfx::Size& pref);
// If |hwnd| is NULL logs various thing and CHECKs. Invoke right after calling
// CreateWindow.
GFX_EXPORT void CheckWindowCreated(HWND hwnd);
// Shows |window|'s system menu (at a specified |point| in screen coordinates).
GFX_EXPORT void ShowSystemMenu(HWND window);
GFX_EXPORT void ShowSystemMenuAtPoint(HWND window, const gfx::Point& point);
// Returns the window you can use to parent a top level window.
// Note that in some cases we create child windows not parented to its final
// container so in those cases you should pass true in |get_real_hwnd|.
GFX_EXPORT HWND GetWindowToParentTo(bool get_real_hwnd);
} // namespace gfx
#endif // UI_GFX_WIN_HWND_UTIL_H_