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子窗口控件(3)之属性罗列和自绘按钮

 
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Windows有29种系统颜色，每种颜色都在0-255之间，它使用GetSysColor和SetSysColors来调用颜色参数：

也就是Windows下的画板的颜色：

罗列一下具体的29种颜色的参数：

如下调用：

SetBkColor(hdc,GetSysColor(COLOR_BTNFACE));
SetTextColor(hdc,GetSysColor(Color_WINDOWTEXT));
//更改了系统颜色，要用下面的语句传递消息
case WM_SYSCOLORCHANGE:
    InvalidateRect(hwnd,NULL,TRUE);
    break;

一般使用获取WM_CTLCOLORSTATIC:消息去改变颜色：


下面看一段自绘按钮的代码：

#include<windows.h>
#include<windowsx.h>

#define ID_SMALLER 1
#define ID_LARGER 2
#define BTN_WIDTH (8*cxChar)
#define BTN_HEIGHT  (4*cyChar)

LRESULT CALLBACK WindowProc(
  HWND hwnd,      // handle to window
  UINT uMsg,      // message identifier
  WPARAM wParam,  // first message parameter
  LPARAM lParam   // second message parameter
);

HINSTANCE hInst;
int WINAPI WinMain(
  HINSTANCE hInstance,      // handle to current instance
  HINSTANCE hPrevInstance,  // handle to previous instance
  LPSTR lpCmdLine,          // command line
  int nCmdShow              // show state
)
{
	static TCHAR szAppName[]=TEXT("leidemingzi");
	HWND hwnd;
	MSG msg;
	WNDCLASS wndclass;

	hInst=hInstance;
	wndclass.cbClsExtra=0;
	wndclass.cbWndExtra=0;
	wndclass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
	wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);
	wndclass.hIcon=LoadIcon(NULL,IDI_ERROR);
	wndclass.hInstance=hInstance;
	wndclass.lpfnWndProc=WindowProc;
	wndclass.lpszClassName=szAppName;
	wndclass.lpszMenuName=NULL;
	wndclass.style=CS_HREDRAW|CS_VREDRAW;

	if(!RegisterClass(&wndclass))
	{
		MessageBox(NULL,TEXT("the program requrie the window nt"),TEXT("tips"),MB_ICONERROR);
		return 0;
	}

	hwnd=CreateWindow(
	  szAppName,  // registered class name
	  TEXT("this is title"), // window name
	  WS_OVERLAPPEDWINDOW,        // window style
	  CW_USEDEFAULT,                // horizontal position of window
	  CW_USEDEFAULT,                // vertical position of window
	  CW_USEDEFAULT,           // window width
	 CW_USEDEFAULT,          // window height
	  NULL,      // handle to parent or owner window
	  NULL,          // menu handle or child identifier
	  hInstance,  // handle to application instance
	  NULL        // window-creation data
);

	ShowWindow(hwnd,nCmdShow);
	UpdateWindow(hwnd);

	while(GetMessage(&msg,NULL,0,0))
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}

	return msg.wParam;
}

void Triangle(HDC hdc,POINT pt[])
{
	SelectObject(hdc,GetStockObject(BLACK_BRUSH));
	Polygon(hdc,pt,3);
	SelectObject(hdc,GetStockObject(WHITE_BRUSH));
}

LRESULT CALLBACK WindowProc(
  HWND hwnd,      // handle to window
  UINT uMsg,      // message identifier
  WPARAM wParam,  // first message parameter
  LPARAM lParam   // second message parameter
)
{
	static HWND hwndSmaller,hwndLarger;
	static int cxClient,cyClient,cxChar,cyChar;
	LPDRAWITEMSTRUCT pdis;
	POINT pt[3];
	int cx,cy;
	RECT rect;

	switch(uMsg)
	{
	case WM_CREATE:
		cxChar=LOWORD(GetDialogBaseUnits());
		cyChar=HIWORD(GetDialogBaseUnits());

		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
			);
		return 0;

	case WM_SIZE:
		cxClient=GET_X_LPARAM(lParam);
		cyClient=GET_Y_LPARAM(lParam);

		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);

		return 0;

	case WM_COMMAND:
		GetWindowRect(hwnd,&rect);

		switch(wParam)
		{
		case ID_SMALLER:
			rect.left+=cxClient/20;
			rect.right-=cxClient/20;
			rect.top+=cyClient/20;
			rect.right-=cyClient/20;
			break;

		case ID_LARGER:
			rect.left-=cxClient/20;
			rect.right+=cxClient/20;
			rect.top-=cyClient/20;
			rect.right+=cyClient/20;
			break;
		}

		MoveWindow(hwnd,rect.left,rect.top,rect.right-rect.left,rect.bottom-rect.top,TRUE);

		return 0;

	case WM_DRAWITEM:
		pdis=(LPDRAWITEMSTRUCT)lParam;

		FillRect(pdis->hDC,&pdis->rcItem,(HBRUSH)GetStockObject(WHITE_BRUSH));

		FrameRect(pdis->hDC,&pdis->rcItem,(HBRUSH)GetStockObject(BLACK_BRUSH));

		cx=pdis->rcItem.right-pdis->rcItem.left;
		cy=pdis->rcItem.bottom-pdis->rcItem.top;

		switch (pdis->CtlID)
          {
          case ID_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 ;
               
          case ID_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 ;
          }

		if(pdis->itemState*ODS_SELECTED)
			InvertRect(pdis->hDC,&pdis->rcItem);

		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);
		}
		return 0;

	case WM_DESTROY:
		PostQuitMessage(0);
		return 0;

	}
	return DefWindowProc(hwnd,uMsg,wParam,lParam);
}


其中，GetDialogBaseUnits()方法类似于TEXTMETRIC的tmAveCharWidth属性

case WM_DRAWITEM在绘制OWNERDRAW控件生效

再看一下DRAWITEMSTRUCT的定义，详细请看MSDN

typedef struct tagDRAWITEMSTRUCT {
  UINT      CtlType; 
  UINT      CtlID; 
  UINT      itemID; 
  UINT      itemAction; 
  UINT      itemState; 
  HWND      hwndItem; 
  HDC       hDC; 
  RECT      rcItem; 
  ULONG_PTR itemData; 
} DRAWITEMSTRUCT


效果图如下：

选中的时候，按钮颜色取反，左边按钮使窗体变小，右边按钮使窗体变大

忠告：

对于使用自绘按钮的人，Windows会为你获得设备环境，并把它放在DRAWITEMSTRUCT结构的一个字段中，必须原样不动保持这个设备的状态，任何一个被选入该设备环境的GDI对象必须设置回原有的不被选中的状态，此外不能在按钮的区域以外绘制任何图形。

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