第四講：鼠標(biāo)

1、.第四講：鼠標(biāo)l 只要鼠標(biāo)跨越窗口，或者在某窗口中按下鼠標(biāo)按鈕，那么窗口過程函數(shù)就會收到鼠標(biāo)消息，而不管該窗口是否為活動窗口和是否擁有輸入焦點(diǎn)窗口。l 鼠標(biāo)消息：1. lParam是相對于客戶區(qū)左上角的坐標(biāo)，其中X坐標(biāo):LOWORD(lParam)Y坐標(biāo):HIWORD(lParam)2. wParam是Shift鍵和Ctrl鍵或鼠標(biāo)按鈕的狀態(tài)，若wParam & MK_SHIFT0wParam & MK_CONTROL0wParam & MK_LBUTTON0wParam & MK_MBUTTON0wParam & MK_RBUTTON0表示在產(chǎn)生相應(yīng)的鼠標(biāo)消息時(shí)，也按下了Shift鍵和Ctr

2、l鍵或鼠標(biāo)按鈕。WM_LBUTTONDOWN WM_MBUTTONDOWN WM_RBUTTONDOWN WM_LBUTTONUPWM_RBUTTONUPWM_MBUTTONUPWM_LBUTTONDBLCLKWM_MBUTTONDBLCLKWM_RBUTTONDBLCLKWM_MOUSEMOVEl 鼠標(biāo)雙擊消息如果希望窗口過程函數(shù)能接受鼠標(biāo)雙擊消息，那么在注冊窗口類時(shí)，窗口風(fēng)格應(yīng)為：wndclass.style = CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS ;l 重點(diǎn)：鼠標(biāo)消息：WM_LBUTTONDOWNWM _MBUTTONDOWN WM_RBUTTOND

3、OWNWM_LBUTTONUPWM_RBUTTONUP WM_MBUTTONUPWM_LBUTTONDBLCLKWM_MBUTTONDBLCLKWM_RBUTTONDBLCLKWM_MOUSEMOVE子窗口風(fēng)格：WS_CHILDWINDOW | WS_VISIBLE取程序?qū)嵗浔?HINSTANCE)GetWindowLong (hwnd, GWL_HINSTANCE)；函數(shù)MoveWindow (hwndChildxy, x * cxBlock, y * cyBlock, cxBlock, cyBlock, TRUE) ;移動窗口和改變窗口大小尺寸，產(chǎn)生WM_SIZE消息。存取預(yù)留在窗口額

4、外字節(jié)的函數(shù)：SetWindowLong (hwnd, 0, 0) ;GetWindowLong (hwnd, 0,0);設(shè)置窗口捕獲鼠標(biāo)函數(shù)：SetCapture(hwnd)；一旦窗口hwnd被設(shè)置了捕獲鼠標(biāo)，不管鼠標(biāo)光標(biāo)是否在窗口hwnd的邊界之內(nèi)，窗口hwnd都接受鼠標(biāo)輸入。釋放窗口捕獲鼠標(biāo)函數(shù)：ReleaseCapture();WM_MOUSEMOVE消息：每當(dāng)鼠標(biāo)移動時(shí)，窗口接收WM_MOUSEMOVE消息，系統(tǒng)此時(shí)自動把鼠標(biāo)光標(biāo)形狀切換到在窗口類中定義的鼠標(biāo)光標(biāo)形狀，如wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;/*- CONN

5、ECT.C - Connect-the-Dots Mouse Demo Program (c) Charles Petzold, 1998 -*/#include #define MAXPOINTS 1000LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow) static TCHAR szAppName = TEXT (Connect) ; HWN

6、D hwnd ; MSG msg ; WNDCLASS wndclass ; 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)

7、; wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ; wndclass.lpszMenuName = NULL ; wndclass.lpszClassName = szAppName ; if (!RegisterClass (&wndclass) MessageBox (NULL, TEXT (Program requires Windows NT!), szAppName, MB_ICONERROR) ; return 0 ; hwnd = CreateWindow (szAppName, TEXT (Con

8、nect-the-Points Mouse Demo), 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) ; return msg.wParam ;

9、LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) static POINT ptMAXPOINTS ; static int iCount ; HDC hdc ; int i, j ; PAINTSTRUCT ps ; switch (message) case WM_LBUTTONDOWN: iCount = 0 ; InvalidateRect (hwnd, NULL, TRUE) ; return 0 ; case WM_MOUSEMOVE: if (wParam & MK_L

10、BUTTON & iCount 1000) ptiCount .x = LOWORD (lParam) ; ptiCount+.y = HIWORD (lParam) ; hdc = GetDC (hwnd) ; /SetPixel (hdc, LOWORD (lParam), HIWORD (lParam), 0) ; SetPixel (hdc, LOWORD (lParam), HIWORD (lParam), RGB(255,0,0) ; ReleaseDC (hwnd, hdc) ; return 0 ; case WM_LBUTTONUP: InvalidateRect (hwnd

11、, NULL, FALSE) ; return 0 ; case WM_PAINT: hdc = BeginPaint (hwnd, &ps) ; SetCursor (LoadCursor (NULL, IDC_WAIT) ; ShowCursor (TRUE) ; for (i = 0 ; i iCount - 1 ; i+) for (j = i + 1 ; j iCount ; j+) MoveToEx (hdc, pti.x, pti.y, NULL) ; LineTo (hdc, ptj.x, ptj.y) ; ShowCursor (FALSE) ; SetCursor (Loa

12、dCursor (NULL, IDC_ARROW) ; EndPaint (hwnd, &ps) ; return 0 ; case WM_DESTROY: PostQuitMessage (0) ; return 0 ; return DefWindowProc (hwnd, message, wParam, lParam) ;/*- CHECKER1.C - Mouse Hit-Test Demo Program No. 1 (c) Charles Petzold, 1998 -*/#include #define DIVISIONS 5LRESULT CALLBACK WndProc (

13、HWND, UINT, WPARAM, LPARAM) ;int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow) static TCHAR szAppName = TEXT (Checker1) ; HWND hwnd ; MSG msg ; WNDCLASS wndclass ; wndclass.style = CS_HREDRAW | CS_VREDRAW ; wndclass.lpfnWndProc = WndProc ; wndclass.cbCls

14、Extra = 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 = NULL ; wndclass.lpszClassName = szAppN

15、ame ; if (!RegisterClass (&wndclass) MessageBox (NULL, TEXT (Program requires Windows NT!), szAppName, MB_ICONERROR) ; return 0 ; hwnd = CreateWindow (szAppName, TEXT (Checker1 Mouse Hit-Test Demo), WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstanc

16、e, NULL) ; ShowWindow (hwnd, iCmdShow) ; UpdateWindow (hwnd) ; while (GetMessage (&msg, NULL, 0, 0) TranslateMessage (&msg) ; DispatchMessage (&msg) ; return msg.wParam ;LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) static BOOL fStateDIVISIONSDIVISIONS ; static int

17、 cxBlock, cyBlock ; HDC hdc ; int x, y ; PAINTSTRUCT ps ; RECT rect ; switch (message) case WM_SIZE : cxBlock = LOWORD (lParam) / DIVISIONS ; cyBlock = HIWORD (lParam) / DIVISIONS ; return 0 ; case WM_LBUTTONDOWN : x = LOWORD (lParam) / cxBlock ; y = HIWORD (lParam) / cyBlock ; if (x DIVISIONS & y D

18、IVISIONS) fState xy = 1 ; rect.left = x * cxBlock ; rect.top = y * cyBlock ; rect.right = (x + 1) * cxBlock ; rect.bottom = (y + 1) * cyBlock ; InvalidateRect (hwnd, &rect, FALSE) ; else MessageBeep (0) ; return 0 ; case WM_PAINT : hdc = BeginPaint (hwnd, &ps) ; for (x = 0 ; x DIVISIONS ; x+) for (y

19、 = 0 ; y DIVISIONS ; y+) Rectangle (hdc, x * cxBlock, y * cyBlock, (x + 1) * cxBlock, (y + 1) * cyBlock) ; if (fState xy) MoveToEx (hdc, x * cxBlock, y * cyBlock, NULL) ; LineTo (hdc, (x+1) * cxBlock, (y+1) * cyBlock) ; MoveToEx (hdc, x * cxBlock, (y+1) * cyBlock, NULL) ; LineTo (hdc, (x+1) * cxBloc

20、k, y * cyBlock) ; EndPaint (hwnd, &ps) ; return 0 ; case WM_DESTROY : PostQuitMessage (0) ; return 0 ; return DefWindowProc (hwnd, message, wParam, lParam) ;/*- CHECKER3.C - Mouse Hit-Test Demo Program No. 3 (c) Charles Petzold, 1998 -*/#include #define DIVISIONS 5LRESULT CALLBACK WndProc (HWND, UIN

21、T, WPARAM, LPARAM) ;LRESULT CALLBACK ChildWndProc (HWND, UINT, WPARAM, LPARAM) ;TCHAR szChildClass = TEXT (Checker3_Child) ;int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow) static TCHAR szAppName = TEXT (Checker3) ; HWND hwnd ; MSG msg ; WNDCLASS wndcla

22、ss ; 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

23、) GetStockObject (WHITE_BRUSH) ; wndclass.lpszMenuName = NULL ; wndclass.lpszClassName = szAppName ; if (!RegisterClass (&wndclass) MessageBox (NULL, TEXT (Program requires Windows NT!), szAppName, MB_ICONERROR) ; return 0 ; wndclass.lpfnWndProc = ChildWndProc ; wndclass.cbWndExtra = sizeof (long) ;

24、 wndclass.hIcon = NULL ; wndclass.lpszClassName = szChildClass ; RegisterClass (&wndclass) ; hwnd = CreateWindow (szAppName, TEXT (Checker3 Mouse Hit-Test Demo), WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance, NULL) ; ShowWindow (hwnd, iCmdShow

25、) ; UpdateWindow (hwnd) ; while (GetMessage (&msg, NULL, 0, 0) TranslateMessage (&msg) ; DispatchMessage (&msg) ; return msg.wParam ;LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) static HWND hwndChildDIVISIONSDIVISIONS ; int cxBlock, cyBlock, x, y ; switch (message

26、) case WM_CREATE : for (x = 0 ; x DIVISIONS ; x+) for (y = 0 ; y DIVISIONS ; y+) hwndChildxy = CreateWindow (szChildClass, NULL, WS_CHILDWINDOW | WS_VISIBLE, 0, 0, 0, 0, hwnd, (HMENU) (y 8 | x), (HINSTANCE) GetWindowLong (hwnd, GWL_HINSTANCE), NULL) ; return 0 ; case WM_SIZE : cxBlock = LOWORD (lPar

27、am) / DIVISIONS ; cyBlock = HIWORD (lParam) / DIVISIONS ; for (x = 0 ; x DIVISIONS ; x+) for (y = 0 ; y DIVISIONS ; y+) MoveWindow (hwndChildxy, x * cxBlock, y * cyBlock, cxBlock, cyBlock, TRUE) ; return 0 ; case WM_LBUTTONDOWN : MessageBeep (0) ; return 0 ; case WM_DESTROY : PostQuitMessage (0) ; r

28、eturn 0 ; return DefWindowProc (hwnd, message, wParam, lParam) ;LRESULT CALLBACK ChildWndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) HDC hdc ; PAINTSTRUCT ps ; RECT rect ; switch (message) case WM_CREATE : SetWindowLong (hwnd, 0, 0) ; / on/off flag return 0 ; case WM_LBUTTONDOWN : S

29、etWindowLong (hwnd, 0, 1 GetWindowLong (hwnd, 0) ; InvalidateRect (hwnd, NULL, FALSE) ; return 0 ; case WM_PAINT : hdc = BeginPaint (hwnd, &ps) ; GetClientRect (hwnd, &rect) ; Rectangle (hdc, 0, 0, rect.right, rect.bottom) ; if (GetWindowLong (hwnd, 0) MoveToEx (hdc, 0, 0, NULL) ; LineTo (hdc, rect.

30、right, rect.bottom) ; MoveToEx (hdc, 0, rect.bottom, NULL) ; LineTo (hdc, rect.right, 0) ; EndPaint (hwnd, &ps) ; return 0 ; return DefWindowProc (hwnd, message, wParam, lParam) ;l 相關(guān)函數(shù)SetPixelThe SetPixel function sets the pixel at the specified coordinates to the specified color. COLORREF SetPixel

31、( HDC hdc, / handle to DC int X, / x-coordinate of pixel int Y, / y-coordinate of pixel COLORREF crColor / pixel color);Parametershdc in Handle to the device context. X in Specifies the x-coordinate, in logical units, of the point to be set. Y in Specifies the y-coordinate, in logical units, of the

32、point to be set. crColor in Specifies the color to be used to paint the point. To create a COLORREF color value, use the RGB macro. Return ValuesIf the function succeeds, the return value is the RGB value that the function sets the pixel to. This value may differ from the color specified by crColor;

33、 that occurs when an exact match for the specified color cannot be found.If the function fails, the return value is 1. SetCursorThe SetCursor function sets the cursor shape. HCURSOR SetCursor( HCURSOR hCursor / handle to cursor);ParametershCursor in Handle to the cursor. The cursor must have been cr

34、eated by the CreateCursor function or loaded by the LoadCursor or LoadImage function. If this parameter is NULL, the cursor is removed from the screen. Return ValuesThe return value is the handle to the previous cursor, if there was one. If there was no previous cursor, the return value is NULL. Loa

35、dCursorThe LoadCursor function loads the specified cursor resource from the executable (.EXE) file associated with an application instance. HCURSOR LoadCursor( HINSTANCE hInstance, / handle to application instance LPCTSTR lpCursorName / name or resource identifier);LoadCursor (NULL, IDC_WAIT)IDC_ARR

36、OW，IDC_CROSS，IDC_WAITMoveToExThe MoveToEx function updates the current position to the specified point and optionally returns the previous position. BOOL MoveToEx( HDC hdc, / handle to device context int X, / x-coordinate of new current position int Y, / y-coordinate of new current position LPPOINT

37、lpPoint / old current position);Parametershdc in Handle to a device context. X in Specifies the x-coordinate of the new position, in logical units. Y in Specifies the y-coordinate of the new position, in logical units. lpPoint out Pointer to a POINT structure that receives the previous current posit

38、ion. If this parameter is a NULL pointer, the previous position is not returned. Return ValuesIf the function succeeds, the return value is nonzero.If the function fails, the return value is zero. LineToThe LineTo function draws a line from the current position up to, but not including, the specifie

39、d point. BOOL LineTo( HDC hdc, / device context handle int nXEnd, / x-coordinate of ending point int nYEnd / y-coordinate of ending point);Parametershdc in Handle to a device context. nXEnd in Specifies the x-coordinate of the lines ending point. nYEnd in Specifies the y-coordinate of the lines endi

40、ng point. Return ValuesIf the function succeeds, the return value is nonzero.If the function fails, the return value is zero. RectangleThe Rectangle function draws a rectangle. The rectangle is outlined by using the current pen and filled by using the current brush. BOOL Rectangle( HDC hdc, / handle

41、 to DC int nLeftRect, / x-coord of upper-left corner of rectangle int nTopRect, / y-coord of upper-left corner of rectangle int nRightRect, / x-coord of lower-right corner of rectangle int nBottomRect / y-coord of lower-right corner of rectangle);Parametershdc in Handle to the device context. nLeftR

42、ect in Specifies the logical x-coordinate of the upper-left corner of the rectangle. nTopRect in Specifies the logical y-coordinate of the upper-left corner of the rectangle. nRightRect in Specifies the logical x-coordinate of the lower-right corner of the rectangle. nBottomRect in Specifies the log

43、ical y-coordinate of the lower-right corner of the rectangle. CreateSolidBrushThe CreateSolidBrush function creates a logical brush that has the specified solid color. HBRUSH CreateSolidBrush( COLORREF crColor / brush color value);ParameterscrColor in Specifies the color of the brush. To create a CO

44、LORREF color value, use the RGB macro. CreatePenThe CreatePen function creates a logical pen that has the specified style, width, and color. The pen can subsequently be selected into a device context and used to draw lines and curves. HPEN CreatePen( int fnPenStyle, / pen style int nWidth, / pen width COLORREF crColor / pen color);ParametersfnPenStyle in Specifies the pen style. It can be any one of the following values. ValueMeaningPS_SOLIDThe pen is solid.PS_DASHThe pen is dashed. This style is valid only when the pen width is one or less in device units.PS_DOTThe pen is dotted.