reactos操作系统实现(164)

继续前面的分析，上次说到需要调用函数co_WinPosShowWindow来显示窗口，那么这个函数里怎么样实现窗口的显示呢？实现代码如下：

#001 BOOLEAN FASTCALL

#002 co_WinPosShowWindow(PWINDOW_OBJECT Window,INT Cmd)

#003 {

#004 BOOLEAN WasVisible;

#005 UINT Swp = 0;

#006 RECT NewPos;

#007 BOOLEAN ShowFlag;

#008 // HRGN VisibleRgn;

#009 PWINDOW Wnd;

#010

#011 ASSERT_REFS_CO(Window);

获取窗口句柄。

#012 Wnd = Window->Wnd;

#013

#014 if (!Wnd) return FALSE;

#015

判断窗口是否可见。

#016 WasVisible = (Wnd->Style & WS_VISIBLE) != 0;

#017

根据窗口显示命令来进行不同代码执行。

#018 switch (Cmd)

#019 {

把窗口隐藏的命令。

#020 case SW_HIDE:

#021 {

#022 if (!WasVisible)

#023 {

#024 return(FALSE);

#025 }

#026 Swp |= SWP_HIDEWINDOW | SWP_NOSIZE | SWP_NOMOVE;

#027 if (Window->hSelf != UserGetActiveWindow())

#028 Swp |= SWP_NOACTIVATE | SWP_NOZORDER;

#029 break;

#030 }

#031

把窗口显示为最小化的命令。

#032 case SW_SHOWMINNOACTIVE:

#033 Swp |= SWP_NOACTIVATE | SWP_NOZORDER;

#034 /* Fall through. */

#035 case SW_SHOWMINIMIZED:

#036 Swp |= SWP_SHOWWINDOW;

#037 /* Fall through. */

#038 case SW_MINIMIZE:

#039 {

#040 Swp |= SWP_NOACTIVATE;

#041 if (!(Wnd->Style & WS_MINIMIZE))

#042 {

#043 Swp |= co_WinPosMinMaximize(Window,SW_MINIMIZE,&NewPos) |

#044 SWP_FRAMECHANGED;

#045 }

#046 else

#047 {

#048 Swp |= SWP_NOSIZE | SWP_NOMOVE;

#049 if (! WasVisible)

#050 {

#051 Swp |= SWP_FRAMECHANGED;

#052 }

#053 }

#054 break;

#055 }

#056

窗口最大化的命令。

#057 case SW_SHOWMAXIMIZED:

#058 {

#059 Swp |= SWP_SHOWWINDOW;

#060 if (!(Wnd->Style & WS_MAXIMIZE))

#061 {

#062 Swp |= co_WinPosMinMaximize(Window,SW_MAXIMIZE,&NewPos) |

#063 SWP_FRAMECHANGED;

#064 }

#065 else

#066 {

#067 Swp |= SWP_NOSIZE | SWP_NOMOVE;

#068 if (! WasVisible)

#069 {

#070 Swp |= SWP_FRAMECHANGED;

#071 }

#072 }

#073 break;

#074 }

#075

一般显示窗口的命令。

#076 case SW_SHOWNA:

#077 Swp |= SWP_NOACTIVATE | SWP_NOZORDER;

#078 /* Fall through. */

#079 case SW_SHOW:

#080 if (WasVisible) return(TRUE); // nothing to do!

#081 Swp |= SWP_SHOWWINDOW | SWP_NOSIZE | SWP_NOMOVE;

#082 /* Don't activate the topmost window. */

#083 break;

#084

恢复窗口显示的命令。

#085 case SW_SHOWNOACTIVATE:

#086 //Swp |= SWP_NOZORDER;

#087 Swp |= SWP_NOACTIVATE | SWP_NOZORDER;

#088 /* Fall through. */

#089 case SW_SHOWnorMAL:

#090 case SW_SHOWDEFAULT:

#091 case SW_RESTORE:

#092 Swp |= SWP_SHOWWINDOW;

#093 if (Wnd->Style & (WS_MINIMIZE | WS_MAXIMIZE))

#094 {

#095 Swp |= co_WinPosMinMaximize(Window,SW_RESTORE,&NewPos) |

#096 SWP_FRAMECHANGED;

#097 }

#098 else

#099 {

#100 Swp |= SWP_NOSIZE | SWP_NOMOVE;

#101 if (! WasVisible)

#102 {

#103 Swp |= SWP_FRAMECHANGED;

#104 }

#105 }

#106 break;

#107 }

#108

#109 ShowFlag = (Cmd != SW_HIDE);

#110

窗口是否需要隐藏或者显示。

#111 if (ShowFlag != WasVisible)

#112 {

发送消息给窗口显示或隐藏。

#113 co_IntSendMessage(Window->hSelf,WM_SHOWWINDOW,ShowFlag,0);

#114 }

#115

不能显示或隐藏一个非MDI的子窗口。

#116 /* We can't activate a child window */

#117 if ((Wnd->Style & WS_CHILD) &&

#118 !(Wnd->ExStyle & WS_EX_MDICHILD))

#119 {

#120 Swp |= SWP_NOACTIVATE | SWP_NOZORDER;

#121 }

#122

设置窗口的位置和显示状态。

#123 co_WinPosSetwindowPos(Window,0 != (Wnd->ExStyle & WS_EX_TOPMOST)

#124 ? HWND_TOPMOST : HWND_TOP,

#125 NewPos.left,NewPos.top,NewPos.right,NewPos.bottom,LOWORD(Swp));

#126

设置窗口隐藏，并设置其它窗口显示出来。

#127 if (Cmd == SW_HIDE)

#128 {

#129 PWINDOW_OBJECT ThreadFocusWindow;

#130

#131 /* FIXME: This will cause the window to be activated irrespective

#132 * of whether it is owned by the same thread. Has to be done

#133 * asynchronously.

#134 */

#135

#136 if (Window->hSelf == UserGetActiveWindow())

#137 {

#138 co_WinPosActivateOtherWindow(Window);

#139 }

#140

#141

#142 //temphack

#143 ThreadFocusWindow = UserGetwindowObject(IntGetThreadFocusWindow());

#144

把焦点转移到父窗口。

#145 /* Revert focus to parent */

#146 if (ThreadFocusWindow && (Window == ThreadFocusWindow ||

#147 IntIsChildWindow(Window,ThreadFocusWindow)))

#148 {

#149 //faxme: as long as we have ref on Window,we also,indirectly,have ref on parent...

#150 co_UserSetFocus(Window->Parent);

#151 }

#152 }

#153

#154 /* FIXME: Check for window destruction. */

#155

发送窗口改变大小、移动的消息。

#156 if ((Window->Flags & WINDOWOBJECT_NEED_SIZE) &&

#157 !(Window->Status & WINDOWSTATUS_DESTROYING))

#158 {

#159 WParaM wParam = SIZE_RESTORED;

#160

#161 Window->Flags &= ~WINDOWOBJECT_NEED_SIZE;

#162 if (Wnd->Style & WS_MAXIMIZE)

#163 {

#164 wParam = SIZE_MAXIMIZED;

#165 }

#166 else if (Wnd->Style & WS_MINIMIZE)

#167 {

#168 wParam = SIZE_MINIMIZED;

#169 }

#170

#171 co_IntSendMessage(Window->hSelf,WM_SIZE,wParam,

#172 MAKELONG(Wnd->ClientRect.right -

#173 Wnd->ClientRect.left,

#174 Wnd->ClientRect.bottom -

#175 Wnd->ClientRect.top));

#176 co_IntSendMessage(Window->hSelf,WM_MOVE,

#177 MAKELONG(Wnd->ClientRect.left,

#178 Wnd->ClientRect.top));

#179 IntEngWindowChanged(Window,WOC_RGN_CLIENT);

#180

#181 }

#182

#183 /* Activate the window if activation is not requested and the window is not minimized */

#184 /*

改变窗口最小化的动作。

#185 if (!(Swp & (SWP_NOACTIVATE | SWP_HIDEWINDOW)) && !(Window->Style & WS_MINIMIZE))

#186 {

#187 WinPosChangeActiveWindow(Wnd,FALSE);

#188 }

#189 */

#190 return(WasVisible);

#191}

原文地址：https://www.jb51.cc/react/308357.html