reactos操作系统实现(164)_reactos topmost

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, 0,

#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  }