Move WindowImpl to gfx so I can use it there for canvas unit tests....

app/win/window_impl.cc

-// 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.
-
-#include "app/win/window_impl.h"
-
-#include <list>
-
-#include "base/singleton.h"
-#include "base/string_util.h"
-#include "base/win_util.h"
-
-namespace app {
-
-static const DWORD kWindowDefaultChildStyle =
-    WS_CHILD | WS_VISIBLE | WS_CLIPCHILDREN | WS_CLIPSIBLINGS;
-static const DWORD kWindowDefaultStyle = WS_OVERLAPPEDWINDOW;
-static const DWORD kWindowDefaultExStyle = 0;
-
-///////////////////////////////////////////////////////////////////////////////
-// WindowImpl class tracking.
-
-// Several external scripts rely explicitly on this base class name for
-// acquiring the window handle and will break if this is modified!
-// static
-const wchar_t* const WindowImpl::kBaseClassName = L"Chrome_WidgetWin_";
-
-// WindowImpl class information used for registering unique windows.
-struct ClassInfo {
-  UINT style;
-  HBRUSH background;
-
-  explicit ClassInfo(int style)
-      : style(style),
-        background(NULL) {}
-
-  // Compares two ClassInfos. Returns true if all members match.
-  bool Equals(const ClassInfo& other) const {
-    return (other.style == style && other.background == background);
-  }
-};
-
-class ClassRegistrar {
- public:
-  ~ClassRegistrar() {
-    for (RegisteredClasses::iterator i = registered_classes_.begin();
-         i != registered_classes_.end(); ++i) {
-      UnregisterClass(i->name.c_str(), NULL);
-    }
-  }
-
-  // Puts the name for the class matching |class_info| in |class_name|, creating
-  // a new name if the class is not yet known.
-  // Returns true if this class was already known, false otherwise.
-  bool RetrieveClassName(const ClassInfo& class_info, std::wstring* name) {
-    for (RegisteredClasses::const_iterator i = registered_classes_.begin();
-         i != registered_classes_.end(); ++i) {
-      if (class_info.Equals(i->info)) {
-        name->assign(i->name);
-        return true;
-      }
-    }
-
-    name->assign(std::wstring(WindowImpl::kBaseClassName) +
-        IntToWString(registered_count_++));
-    return false;
-  }
-
-  void RegisterClass(const ClassInfo& class_info,
-                     const std::wstring& name,
-                     ATOM atom) {
-    registered_classes_.push_back(RegisteredClass(class_info, name, atom));
-  }
-
- private:
-  // Represents a registered window class.
-  struct RegisteredClass {
-    RegisteredClass(const ClassInfo& info,
-                    const std::wstring& name,
-                    ATOM atom)
-        : info(info),
-          name(name),
-          atom(atom) {
-    }
-
-    // Info used to create the class.
-    ClassInfo info;
-
-    // The name given to the window.
-    std::wstring name;
-
-    // The ATOM returned from creating the window.
-    ATOM atom;
-  };
-
-  ClassRegistrar() : registered_count_(0) { }
-  friend struct DefaultSingletonTraits<ClassRegistrar>;
-
-  typedef std::list<RegisteredClass> RegisteredClasses;
-  RegisteredClasses registered_classes_;
-
-  // Counter of how many classes have been registered so far.
-  int registered_count_;
-
-  DISALLOW_COPY_AND_ASSIGN(ClassRegistrar);
-};
-
-///////////////////////////////////////////////////////////////////////////////
-// WindowImpl, public
-
-WindowImpl::WindowImpl()
-    : window_style_(0),
-      window_ex_style_(kWindowDefaultExStyle),
-      class_style_(CS_DBLCLKS),
-      hwnd_(NULL) {
-}
-
-WindowImpl::~WindowImpl() {
-}
-
-void WindowImpl::Init(HWND parent, const gfx::Rect& bounds) {
-  if (window_style_ == 0)
-    window_style_ = parent ? kWindowDefaultChildStyle : kWindowDefaultStyle;
-
-  // Ensures the parent we have been passed is valid, otherwise CreateWindowEx
-  // will fail.
-  if (parent && !::IsWindow(parent)) {
-    NOTREACHED() << "invalid parent window specified.";
-    parent = NULL;
-  }
-
-  int x, y, width, height;
-  if (bounds.IsEmpty()) {
-    x = y = width = height = CW_USEDEFAULT;
-  } else {
-    x = bounds.x();
-    y = bounds.y();
-    width = bounds.width();
-    height = bounds.height();
-  }
-
-  hwnd_ = CreateWindowEx(window_ex_style_, GetWindowClassName().c_str(), NULL,
-                         window_style_, x, y, width, height,
-                         parent, NULL, NULL, this);
-  DCHECK(hwnd_);
-
-  // The window procedure should have set the data for us.
-  DCHECK(win_util::GetWindowUserData(hwnd_) == this);
-}
-
-HICON WindowImpl::GetDefaultWindowIcon() const {
-  return NULL;
-}
-
-// static
-bool WindowImpl::IsWindowImpl(HWND hwnd) {
-  wchar_t tmp[128];
-  if (!::GetClassName(hwnd, tmp, 128))
-    return false;
-
-  std::wstring class_name(tmp);
-  return class_name.find(kBaseClassName) == 0;
-}
-
-LRESULT WindowImpl::OnWndProc(UINT message, WPARAM w_param, LPARAM l_param) {
-  LRESULT result = 0;
-
-  // Handle the message if it's in our message map; otherwise, let the system
-  // handle it.
-  if (!ProcessWindowMessage(hwnd_, message, w_param, l_param, result))
-    result = DefWindowProc(hwnd_, message, w_param, l_param);
-
-  return result;
-}
-
-// static
-LRESULT CALLBACK WindowImpl::WndProc(HWND hwnd,
-                                     UINT message,
-                                     WPARAM w_param,
-                                     LPARAM l_param) {
-  if (message == WM_NCCREATE) {
-    CREATESTRUCT* cs = reinterpret_cast<CREATESTRUCT*>(l_param);
-    WindowImpl* window = reinterpret_cast<WindowImpl*>(cs->lpCreateParams);
-    DCHECK(window);
-    win_util::SetWindowUserData(hwnd, window);
-    window->hwnd_ = hwnd;
-    return TRUE;
-  }
-
-  WindowImpl* window = reinterpret_cast<WindowImpl*>(
-      win_util::GetWindowUserData(hwnd));
-  if (!window)
-    return 0;
-
-  return window->OnWndProc(message, w_param, l_param);
-}
-
-std::wstring WindowImpl::GetWindowClassName() {
-  ClassInfo class_info(initial_class_style());
-  std::wstring name;
-  if (Singleton<ClassRegistrar>()->RetrieveClassName(class_info, &name))
-    return name;
-
-  // No class found, need to register one.
-  WNDCLASSEX class_ex;
-  class_ex.cbSize = sizeof(WNDCLASSEX);
-  class_ex.style = class_info.style;
-  class_ex.lpfnWndProc = &WindowImpl::WndProc;
-  class_ex.cbClsExtra = 0;
-  class_ex.cbWndExtra = 0;
-  class_ex.hInstance = NULL;
-  class_ex.hIcon = GetDefaultWindowIcon();
-  class_ex.hCursor = LoadCursor(NULL, IDC_ARROW);
-  class_ex.hbrBackground = reinterpret_cast<HBRUSH>(class_info.background + 1);
-  class_ex.lpszMenuName = NULL;
-  class_ex.lpszClassName = name.c_str();
-  class_ex.hIconSm = class_ex.hIcon;
-  ATOM atom = RegisterClassEx(&class_ex);
-  DCHECK(atom);
-
-  Singleton<ClassRegistrar>()->RegisterClass(class_info, name, atom);
-
-  return name;
-}
-
-}  // namespace app