reactos操作系统实现(180)

DefWndNCPaint函数实现窗口非客户区的显示部分，比如窗口的标题、最大化、最小化、关闭按钮、滚动条等等。

#001 LRESULT

#002 DefWndNCPaint(HWND hWnd,HRGN hRgn,BOOL Active)

#003 {

#004 HDC hDC;

#005 DWORD Style,ExStyle;

#006 HWND Parent;

#007 RECT ClientRect,WindowRect,CurrentRect,TempRect;

#008

如果窗口不可见，就不用进行显示操作。

#009 if (!IsWindowVisible(hWnd))

#010 return 0;

#011

获取窗口的类型。

#012 Style = GetWindowLongW(hWnd,GWL_STYLE);

#013

获取窗口的设备。

#014 hDC = GetDCEx(hWnd,hRgn,DCX_WINDOW | DCX_INTERSECTRGN | DCX_USESTYLE | DCX_KEEPCLIPRGN);

#015 if (hDC == 0)

#016 {

#017 return 0;

#018 }

#019

获取父窗口。

#020 Parent = GetParent(hWnd);

获取窗口扩展类型。

#021 ExStyle = GetWindowLongW(hWnd,GWL_EXSTYLE);

判断当前窗口是否为有焦点的窗口。

#022 if (Active == -1)

#023 {

#024 if (ExStyle & WS_EX_MDICHILD)

#025 {

#026 Active = IsChild(GetForegroundWindow(),hWnd);

#027 if (Active)

#028 Active = (hWnd == (HWND)SendMessageW(Parent,WM_MDIGETACTIVE,0));

#029 }

#030 else

#031 {

#032 Active = (GetForegroundWindow() == hWnd);

#033 }

#034 }

获取窗口的位置和大小。

#035 GetWindowRect(hWnd,&WindowRect);

获取窗口客户区的大小。

#036 GetClientRect(hWnd,&ClientRect);

#037

计算窗口的大小。

#038 CurrentRect.top = CurrentRect.left = 0;

#039 CurrentRect.right = WindowRect.right - WindowRect.left;

#040 CurrentRect.bottom = WindowRect.bottom - WindowRect.top;

#041

如果窗口有边沿类型，就需要画边沿窗口。

#042 /* Draw outer edge */

#043 if (UserHasWindowEdge(Style,ExStyle))

#044 {

显示窗口的边沿线。

#045 DrawEdge(hDC,&CurrentRect,EDGE_RAISED,BF_RECT | BF_ADJUST);

#046 } else

#047 if (ExStyle & WS_EX_STATICEDGE)

#048 {

显示固定边沿线。

#049 #if 0

#050 DrawEdge(hDC,BDR_SUNKENINNER,BF_RECT | BF_ADJUST | BF_FLAT);

#051 #else

#052 SelectObject(hDC,GetSysColorBrush(COLOR_BTNSHADOW));

#053 PatBlt(hDC,CurrentRect.left,CurrentRect.top,CurrentRect.right - CurrentRect.left,1,PATCOPY);

#054 PatBlt(hDC,CurrentRect.bottom - CurrentRect.top,PATCOPY);

#055

#056 SelectObject(hDC,GetSysColorBrush(COLOR_BTNHIGHLIGHT));

#057 PatBlt(hDC,CurrentRect.bottom - 1,PATCOPY);

#058 PatBlt(hDC,CurrentRect.right - 1,PATCOPY);

#059

#060 InflateRect(&CurrentRect,-1,-1);

#061 #endif

#062 }

#063

显示窗口细边框的样式。

#064 /* Firstly the "thick" frame */

#065 if ((Style & WS_THICKFRAME) && !(Style & WS_MINIMIZE))

#066 {

#067 DWORD Width =

#068 (GetSystemMetrics(SM_CXFRAME) - GetSystemMetrics(SM_CXDLGFRAME)) *

#069 GetSystemMetrics(SM_CXBORDER);

#070 DWORD Height =

#071 (GetSystemMetrics(SM_CYFRAME) - GetSystemMetrics(SM_CYDLGFRAME)) *

#072 GetSystemMetrics(SM_CYBORDER);

#073

#074 SelectObject(hDC,GetSysColorBrush(Active ? COLOR_ACTIVEBORDER :

#075 COLOR_INACTIVEBORDER));

#076

#077 /* Draw frame */

#078 PatBlt(hDC,Height,PATCOPY);

#079 PatBlt(hDC,Width,PATCOPY);

#080 #ifdef __REACTOS__

#081 PatBlt(hDC,-Height,PATCOPY);

#082 PatBlt(hDC,-Width,PATCOPY);

#083 #else

#084 PatBlt(hDC,CurrentRect.bottom,PATCOPY);

#085 PatBlt(hDC,CurrentRect.right,PATCOPY);

#086 #endif

#087

#088 InflateRect(&CurrentRect,-Height);

#089 }

#090

显示框架部分。

#091 /* Now the other bit of the frame */

#092 if (Style & (WS_DLGFRAME | WS_BORDER) || ExStyle & WS_EX_DLGMODALFRAME)

#093 {

#094 DWORD Width = GetSystemMetrics(SM_CXBORDER);

#095 DWORD Height = GetSystemMetrics(SM_CYBORDER);

#096

#097 SelectObject(hDC,GetSysColorBrush(

#098 (ExStyle & (WS_EX_DLGMODALFRAME | WS_EX_CLIENTEDGE)) ? COLOR_3DFACE :

#099 (ExStyle & WS_EX_STATICEDGE) ? COLOR_WINDOWFRAME :

#100 (Style & (WS_DLGFRAME | WS_THICKFRAME)) ? COLOR_3DFACE :

#101 COLOR_WINDOWFRAME));

#102

#103 /* Draw frame */

#104 PatBlt(hDC,PATCOPY);

#105 PatBlt(hDC,PATCOPY);

#106 #ifdef __REACTOS__

#107 PatBlt(hDC,PATCOPY);

#108 PatBlt(hDC,PATCOPY);

#109 #else

#110 PatBlt(hDC,PATCOPY);

#111 PatBlt(hDC,PATCOPY);

#112 #endif

#113

#114 InflateRect(&CurrentRect,-Height);

#115 }

#116

当窗口有标题时，就需要显示标题，也就是显示窗口最顶端的字符串。

#117 /* Draw caption */

#118 if ((Style & WS_CAPTION) == WS_CAPTION)

#119 {

#120 DWORD CaptionFlags = DC_ICON | DC_TEXT | DC_BUTTONS;

#121 HPEN PreviousPen;

#122 BOOL Gradient = FALSE;

#123

#124 if(SystemParametersInfoW(SPI_GETGRADIENTCAPTIONS,&Gradient,0) && Gradient)

#125 {

#126 CaptionFlags |= DC_GRADIENT;

#127 }

#128

#129 TempRect = CurrentRect;

#130

#131 if (Active)

#132 {

#133 CaptionFlags |= DC_ACTIVE;

#134 }

#135

如果是工具条窗口，就需要显示窗口标题为比较小。

#136 if (ExStyle & WS_EX_TOOLWINDOW)

#137 {

#138 CaptionFlags |= DC_SMALLCAP;

#139 TempRect.bottom = TempRect.top + GetSystemMetrics(SM_CYSMCAPTION) - 1;

#140 CurrentRect.top += GetSystemMetrics(SM_CYSMCAPTION);

#141 }

#142 else

#143 {

#144 TempRect.bottom = TempRect.top + GetSystemMetrics(SM_CYCAPTION) - 1;

#145 CurrentRect.top += GetSystemMetrics(SM_CYCAPTION);

#146 }

#147

下面调用函数NtUserDrawCaption来显示窗口标题。

#148 NtUserDrawCaption(hWnd,hDC,&TempRect,CaptionFlags);

#149

下面显示系统的菜单按钮。

#150 /* Draw buttons */

#151 if (Style & WS_SYSMENU)

#152 {

#153 UserDrawCaptionButton(&TempRect,Style,ExStyle,FALSE,DFCS_CAPTIONCLOSE);

#154 if ((Style & (WS_MAXIMIZEBOX | WS_MINIMIZEBOX)) && !(ExStyle & WS_EX_TOOLWINDOW))

#155 {

#156 UserDrawCaptionButton(&TempRect,DFCS_CAPTIONMIN);

#157 UserDrawCaptionButton(&TempRect,DFCS_CAPTIONMAX);

#158 }

#159 }

#160 if(!(Style & WS_MINIMIZE))

#161 {

#162 /* Line under caption */

#163 PreviousPen = SelectObject(hDC,GetSysColorPen(

#164 ((ExStyle & (WS_EX_STATICEDGE | WS_EX_CLIENTEDGE |

#165 WS_EX_DLGMODALFRAME)) == WS_EX_STATICEDGE) ?

#166 COLOR_WINDOWFRAME : COLOR_3DFACE));

#167 MoveToEx(hDC,TempRect.left,TempRect.bottom,NULL);

#168 LineTo(hDC,TempRect.right,TempRect.bottom);

#169 SelectObject(hDC,PreviousPen);

#170 }

#171 }

#172

#173 if(!(Style & WS_MINIMIZE))

#174 {

#175 HMENU menu = GetMenu(hWnd);

#176 /* Draw menu bar */

#177 if (menu && !(Style & WS_CHILD))

#178 {

#179 TempRect = CurrentRect;

#180 TempRect.bottom = TempRect.top + (UINT)NtUserSetMenuBarHeight(menu,0);

#181 CurrentRect.top += MenuDrawMenuBar(hDC,hWnd,FALSE);

#182 }

#183

显示客户区边界。

#184 if (ExStyle & WS_EX_CLIENTEDGE)

#185 {

#186 DrawEdge(hDC,EDGE_SUNKEN,BF_RECT | BF_ADJUST);

#187 }

#188

显示窗口的滚动条。

#189 /* Draw the scrollbars */

#190 if ((Style & WS_VSCROLL) && (Style & WS_HSCROLL) &&

#191 IntIsScrollBarVisible(hWnd,OBJID_VSCROLL) && IntIsScrollBarVisible(hWnd,OBJID_HSCROLL))

#192 {

#193 RECT ParentClientRect;

#194

#195 TempRect = CurrentRect;

#196 if (ExStyle & WS_EX_LEFTSCROLLBAR)

#197 TempRect.right = TempRect.left + GetSystemMetrics(SM_CXVSCROLL);

#198 else

#199 TempRect.left = TempRect.right - GetSystemMetrics(SM_CXVSCROLL);

#200 TempRect.top = TempRect.bottom - GetSystemMetrics(SM_CYHSCROLL);

#201 FillRect(hDC,GetSysColorBrush(COLOR_BTNFACE));

#202 /* FIXME: Correct drawing of size-box with WS_EX_LEFTSCROLLBAR */

#203 if(Parent)

#204 GetClientRect(Parent,&ParentClientRect);

#205 if (HASSIZEGRIP(Style,GetWindowLongW(Parent,GWL_STYLE),ParentClientRect))

#206 {

#207 DrawFrameControl(hDC,DFC_SCROLL,DFCS_SCROLLSIZEGRIP);

#208 }

#209 IntDrawScrollBar(hWnd,SB_VERT);

#210 IntDrawScrollBar(hWnd,SB_HORZ);

#211 }

#212 else

#213 {

#214 if (Style & WS_VSCROLL && IntIsScrollBarVisible(hWnd,OBJID_VSCROLL))

#215 IntDrawScrollBar(hWnd,SB_VERT);

#216 else if (Style & WS_HSCROLL && IntIsScrollBarVisible(hWnd,OBJID_HSCROLL))

#217 IntDrawScrollBar(hWnd,SB_HORZ);

#218 }

#219 }

#220

#221 ReleaseDC(hWnd,hDC);

#222

#223 return 0;

#224}

（编辑：李大同）

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