OWNDRAW.docx
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OWNDRAW
/*---------------------------------------------
OWNDRAW.C--Owner-DrawButtonDemoProgram
（c）CharlesPetzold,1998
---------------------------------------------*/
#include
#defineID_SMALLER1
#defineID_LARGER2
#defineBTN_WIDTH（8*cxChar）
#defineBTN_HEIGHT（4*cyChar）
LRESULTCALLBACKWndProc（HWND,UINT,WPARAM,LPARAM）;
HINSTANCEhInst;
intWINAPIWinMain（HINSTANCEhInstance,HINSTANCEhPrevInstance,
PSTRszCmdLine,intiCmdShow）
{
staticTCHARszAppName[]=TEXT（"OwnDraw"）;
MSGmsg;
HWNDhwnd;
WNDCLASSwndclass;
hInst=hInstance;
wndclass.style=CS_HREDRAW|CS_VREDRAW;
wndclass.lpfnWndProc=WndProc;
wndclass.cbClsExtra=0;
wndclass.cbWndExtra=0;
wndclass.hInstance=hInstance;
wndclass.hIcon=LoadIcon（NULL,IDI_APPLICATION）;
wndclass.hCursor=LoadCursor（NULL,IDC_ARROW）;
wndclass.hbrBackground=（HBRUSH）GetStockObject（WHITE_BRUSH）;
wndclass.lpszMenuName=szAppName;
wndclass.lpszClassName=szAppName;
if（!
RegisterClass（&wndclass））
{
MessageBox（NULL,TEXT（"ThisprogramrequiresWindowsNT!
"）,
szAppName,MB_ICONERROR）;
return0;
}
hwnd=CreateWindow（szAppName,TEXT（"Owner-DrawButtonDemo"）,
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,CW_USEDEFAULT,
CW_USEDEFAULT,CW_USEDEFAULT,
NULL,NULL,hInstance,NULL）;
ShowWindow（hwnd,iCmdShow）;
UpdateWindow（hwnd）;
while（GetMessage（&msg,NULL,0,0））
{
TranslateMessage（&msg）;
DispatchMessage（&msg）;
}
returnmsg.wParam;
}
voidTriangle（HDChdc,POINTpt[]）
{
SelectObject（hdc,GetStockObject（BLACK_BRUSH））;
Polygon（hdc,pt,3）;
SelectObject（hdc,GetStockObject（WHITE_BRUSH））;
}
LRESULTCALLBACKWndProc（HWNDhwnd,UINTmessage,WPARAMwParam,LPARAMlParam）
{
staticHWNDhwndSmaller,hwndLarger;
staticintcxClient,cyClient,cxChar,cyChar;
intcx,cy;
LPDRAWITEMSTRUCTpdis;
POINTpt[3];
RECTrc;
switch（message）
{
caseWM_CREATE:
cxChar=LOWORD（GetDialogBaseUnits（））;
cyChar=HIWORD（GetDialogBaseUnits（））;
//Createtheowner-drawpushbuttons
hwndSmaller=CreateWindow（TEXT（"button"）,TEXT（""）,
WS_CHILD|WS_VISIBLE|BS_OWNERDRAW,
0,0,BTN_WIDTH,BTN_HEIGHT,
hwnd,（HMENU）ID_SMALLER,hInst,NULL）;
hwndLarger=CreateWindow（TEXT（"button"）,TEXT（""）,
WS_CHILD|WS_VISIBLE|BS_OWNERDRAW,
0,0,BTN_WIDTH,BTN_HEIGHT,
hwnd,（HMENU）ID_LARGER,hInst,NULL）;
return0;
caseWM_SIZE:
cxClient=LOWORD（lParam）;
cyClient=HIWORD（lParam）;
//Movethebuttonstothenewcenter
MoveWindow（hwndSmaller,cxClient/2-3*BTN_WIDTH/2,
cyClient/2-BTN_HEIGHT/2,
BTN_WIDTH,BTN_HEIGHT,TRUE）;
MoveWindow（hwndLarger,cxClient/2+BTN_WIDTH/2,
cyClient/2-BTN_HEIGHT/2,
BTN_WIDTH,BTN_HEIGHT,TRUE）;
return0;
caseWM_COMMAND:
GetWindowRect（hwnd,&rc）;
//Makethewindow10%smallerorlarger
switch（wParam）
{
caseID_SMALLER:
rc.left+=cxClient/20;
rc.right-=cxClient/20;
rc.top+=cyClient/20;
rc.bottom-=cyClient/20;
break;
caseID_LARGER:
rc.left-=cxClient/20;
rc.right+=cxClient/20;
rc.top-=cyClient/20;
rc.bottom+=cyClient/20;
break;
}
MoveWindow（hwnd,rc.left,rc.top,rc.right-rc.left,
rc.bottom-rc.top,TRUE）;
return0;
caseWM_DRAWITEM:
pdis=（LPDRAWITEMSTRUCT）lParam;
//Fillareawithwhiteandframeitblack
FillRect（pdis->hDC,&pdis->rcItem,
（HBRUSH）GetStockObject（WHITE_BRUSH））;
FrameRect（pdis->hDC,&pdis->rcItem,
（HBRUSH）GetStockObject（BLACK_BRUSH））;
//Drawinwardandoutwardblacktriangles
cx=pdis->rcItem.right-pdis->rcItem.left;
cy=pdis->rcItem.bottom-pdis->rcItem.top;
switch（pdis->CtlID）
{
caseID_SMALLER:
pt[0].x=3*cx/8;pt[0].y=1*cy/8;
pt[1].x=5*cx/8;pt[1].y=1*cy/8;
pt[2].x=4*cx/8;pt[2].y=3*cy/8;
Triangle（pdis->hDC,pt）;
pt[0].x=7*cx/8;pt[0].y=3*cy/8;
pt[1].x=7*cx/8;pt[1].y=5*cy/8;
pt[2].x=5*cx/8;pt[2].y=4*cy/8;
Triangle（pdis->hDC,pt）;
pt[0].x=5*cx/8;pt[0].y=7*cy/8;
pt[1].x=3*cx/8;pt[1].y=7*cy/8;
pt[2].x=4*cx/8;pt[2].y=5*cy/8;
Triangle（pdis->hDC,pt）;
pt[0].x=1*cx/8;pt[0].y=5*cy/8;
pt[1].x=1*cx/8;pt[1].y=3*cy/8;
pt[2].x=3*cx/8;pt[2].y=4*cy/8;
Triangle（pdis->hDC,pt）;
break;
caseID_LARGER:
pt[0].x=5*cx/8;pt[0].y=3*cy/8;
pt[1].x=3*cx/8;pt[1].y=3*cy/8;
pt[2].x=4*cx/8;pt[2].y=1*cy/8;
Triangle（pdis->hDC,pt）;
pt[0].x=5*cx/8;pt[0].y=5*cy/8;
pt[1].x=5*cx/8;pt[1].y=3*cy/8;
pt[2].x=7*cx/8;pt[2].y=4*cy/8;
Triangle（pdis->hDC,pt）;
pt[0].x=3*cx/8;pt[0].y=5*cy/8;
pt[1].x=5*cx/8;pt[1].y=5*cy/8;
pt[2].x=4*cx/8;pt[2].y=7*cy/8;
Triangle（pdis->hDC,pt）;
pt[0].x=3*cx/8;pt[0].y=3*cy/8;
pt[1].x=3*cx/8;pt[1].y=5*cy/8;
pt[2].x=1*cx/8;pt[2].y=4*cy/8;
Triangle（pdis->hDC,pt）;
break;
}
//Inverttherectangleifthebuttonisselected
if（pdis->itemState&ODS_SELECTED）
InvertRect（pdis->hDC,&pdis->rcItem）;
//Drawafocusrectangleifthebuttonhasthefocus
if（pdis->itemState&ODS_FOCUS）
{
pdis->rcItem.left+=cx/16;
pdis->rcItem.top+=cy/16;
pdis->rcItem.right-=cx/16;
pdis->rcItem.bottom-=cy/16;
DrawFocusRect（pdis->hDC,&pdis->rcItem）;
}
return0;
caseWM_DESTROY:
PostQuitMessage（0）;
return0;
}
returnDefWindowProc（hwnd,message,wParam,lParam）;
}
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