7.2 客户区鼠标消息

当鼠标移过窗口的显示区域时，窗口消息处理程序收到WM_MOUSEMOVE消息。当在窗口的显示区域中按下或者释放一个鼠标按键时，窗口消息处理程序会接收到下面这些消息：

键

按下

释放

按下(双键)

左

WM_LBUTTONDOWN

WM_LBUTTONUP

WM_LBUTTONDBLCLK

中

WM_MBUTTONDOWN

WM_MBUTTONUP

WM_MBUTTONDBLCLK

右

WM_RBUTTONDOWN

WM_RBUTTONUP

WM_RBUTTONDBLCLK

要接受到双键消息，需要在wndclass.style处增加CS_DBLCLKS

在WM_MOUSEMOVE中，可以用LOWORD和HIWORD宏来提取鼠标的位置：

x = LOWORD (lParam) ;

y = HIWORD (lParam) ;

wParam中包含信息。MK前缀代表「鼠标按键」。

MK_LBUTTON

按下左键

MK_MBUTTON

按下中键

MK_RBUTTON

按下右键

MK_SHIFT

按下Shift键

MK_CONTROL

按下Ctrl键

当您把鼠标移过窗口的显示区域时，Windows并不为鼠标的每个可能的图素位置都产生一个WM_MOUSEMOVE消息。您的程序接收到WM_MOUSEMOVE消息的次数，依赖于鼠标硬件，以及您的窗口消息处理程序在处理鼠标移动消息时的速度。

  1. 窗口消息处理程序可以「拦截鼠标」并且连续地接收鼠标消息，即使此时鼠标在该窗口显示区域之外。您将在本章的后面学习如何拦截鼠标。
  2. 如果正在显示一个系统模态消息框或者系统模态对话框，那么其它程序就不能接收鼠标消息。当系统模态消息框或者对话框活动时，禁止切换到其它窗口或者程序。一个显示系统模态消息框的例子，是当您关闭Windows时。

实例

#include<windows.h>

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)

{

    static TCHAR szAppName[] = TEXT("Mouse Move");

    HWND hwnd;

    MSG msg;

    WNDCLASS wndclass;

    wndclass.hInstance = hInstance;

    wndclass.lpfnWndProc = WndProc;

    wndclass.lpszClassName = szAppName;

    wndclass.style = CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS;

    wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);

    wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);

    wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);

    wndclass.cbClsExtra = ;

    wndclass.cbWndExtra = ;

    wndclass.lpszMenuName = ;

    if (!RegisterClass(&wndclass))

    {

        MessageBox(NULL, TEXT("错误, 无法注册窗口类."), TEXT("错误"), MB_OK);

        return ;

    }

    hwnd = CreateWindow(szAppName, TEXT("Mouse Move"),

        WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT,

        CW_USEDEFAULT, CW_USEDEFAULT,

        NULL, NULL, hInstance, NULL);

    ShowWindow(hwnd, iCmdShow);

    UpdateWindow(hwnd);

    while (GetMessage(&msg, NULL, , ))

    {

        TranslateMessage(&msg);

        DispatchMessage(&msg);

    }

    return msg.wParam;

}

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)

{

    static POINT pt[];

    HDC hdc;

    static int iCount;

    PAINTSTRUCT ps;

    int i, j;

    switch (message) {

    case WM_LBUTTONDOWN:

        iCount = ;

        InvalidateRect(hwnd, NULL, TRUE);//重画时擦除背景

        return ;

    case WM_MOUSEMOVE:

        if (wParam && MK_LBUTTON && iCount < ) {

            pt[iCount].x = LOWORD(lParam);

            pt[iCount++].y = HIWORD(lParam);

            hdc = GetDC(hwnd);

            SetPixel(hdc, LOWORD(lParam), HIWORD(lParam), );

            ReleaseDC(hwnd, hdc);

        }

        return ;

    case WM_LBUTTONUP:

        InvalidateRect(hwnd, NULL, FALSE);//重画时不擦除背景

        return ;

    case WM_PAINT:

        hdc = BeginPaint(hwnd, &ps);

        SetCursor(LoadCursor(NULL, IDC_WAIT));

        ShowCursor(TRUE);//显示鼠标

        for (i = ; i < iCount - ; ++i) {

            for (j = i + ; j < iCount; ++j) {

                MoveToEx(hdc, pt[i].x, pt[i].y, NULL);

                LineTo(hdc, pt[j].x, pt[j].y);

            }

        }

        SetCursor(LoadCursor(NULL, IDC_ARROW));

        ShowCursor(FALSE);//隐藏鼠标

        EndPaint(hwnd, &ps);

    }

    return DefWindowProc(hwnd, message, wParam, lParam);

}

7.2.2 处理shift

组合键测试

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)

{

    switch (message) {

    case WM_MOUSEMOVE:

        if (wParam & MK_CONTROL) {

            if (wParam & MK_SHIFT) {

                MessageBox(hwnd, TEXT("按下Ctrl+Shift键"), TEXT("test！"), NULL);

                return ;

            }

        }

    }

    return DefWindowProc(hwnd, message, wParam, lParam);

}

7.2.3 鼠标双击

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)

{

    switch (message) {

    case WM_LBUTTONDBLCLK:

        MessageBox(hwnd, TEXT("左键双击"), TEXT("test！"), NULL);

        return ;

    }

    return DefWindowProc(hwnd, message, wParam, lParam);

}

客户区鼠标消息简单应用

#include<windows.h>

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)

{

    static TCHAR szAppName[] = TEXT("Mouse Move");

    HWND hwnd;

    MSG msg;

    WNDCLASS wndclass;

    wndclass.hInstance = hInstance;

    wndclass.lpfnWndProc = WndProc;

    wndclass.lpszClassName = szAppName;

    wndclass.style = CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS;

    wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);

    wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);

    wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);

    wndclass.cbClsExtra = ;

    wndclass.cbWndExtra = ;

    wndclass.lpszMenuName = ;

    if (!RegisterClass(&wndclass))

    {

        MessageBox(NULL, TEXT("错误, 无法注册窗口类."), TEXT("错误"), MB_OK);

        return ;

    }

    hwnd = CreateWindow(szAppName, TEXT("Mouse Move"),

        WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT,

        , ,

        NULL, NULL, hInstance, NULL);

    ShowWindow(hwnd, iCmdShow);

    UpdateWindow(hwnd);

    while (GetMessage(&msg, NULL, , ))

    {

        TranslateMessage(&msg);

        DispatchMessage(&msg);

    }

    return msg.wParam;

}

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)

{

    static int cxClient, cyClient;

    static POINT point;

    HDC hdc;

    PAINTSTRUCT ps;

    TCHAR szBuffer[];

    switch (message) {

    case WM_SIZE:

        cxClient = LOWORD(lParam);

        cyClient = HIWORD(lParam);

        return ;

    case WM_MOUSEMOVE:

        GetCursorPos(&point);

        InvalidateRect(hwnd, NULL, TRUE);

        return ;

    case WM_PAINT:

        hdc = BeginPaint(hwnd, &ps);

        TextOut(hdc, cxClient /  - , cyClient /  - , szBuffer, wsprintf(szBuffer, TEXT("屏幕坐标(%d, %d)"), point.x, point.y));

        ScreenToClient(hwnd, &point);

        TextOut(hdc, cxClient /  - , cyClient /  , szBuffer, wsprintf(szBuffer, TEXT("客户区坐标(%d, %d)"), point.x, point.y));

        EndPaint(hwnd, &ps);

        return ;

    }

    return DefWindowProc(hwnd, message, wParam, lParam);

}

7.3 非客户区鼠标消息

键

按下

释放

按下（双击）

左

WM_NCLBUTTONDOWN

WM_NCLBUTTONUP

WM_NCLBUTTONDBLCLK

中

WM_NCMBUTTONDOWN

WM_NCMBUTTONUP

WM_NCMBUTTONDBLCLK

右

WM_NCRBUTTONDOWN

WM_NCRBUTTONUP

WM_NCRBUTTONDBLCLK

可以用两个Windows函数将屏幕坐标转换为显示区域坐标或者反之：

ScreenToClient (hwnd, &pt) ;

ClientToScreen (hwnd, &pt) ;

7.3.1 击中测试消息

WM_NCHITTEST，它代表「非显示区域命中测试」。此消息优先于所有其它的显示区域和非显示区域鼠标消息。lParam参数含有鼠标位置的x和y屏幕坐标，wParam 参数另有用途。

Windows应用程序通常把这个消息传送给DefWindowProc，然后Windows用WM_NCHITTEST消息产生与鼠标位置相关的所有其它鼠标消息。对于非显示区域鼠标消息，在处理WM_NCHITTEST时，从DefWindowProc传回的值将成为鼠标消息中的wParam参数，这个值可以是任意非显示区域鼠标消息的wParam值再加上以下内容：

HTCLIENT

HTNOWHERE

HTTRANSPARENT

HTERROR

显示区域

不在窗口中

窗口由另一个窗口覆盖

使DefWindowProc产生警示用的哔声

如果DefWindowProc在其处理WM_NCHITTEST消息后传回HTCLIENT，那么Windows将把屏幕坐标转换为显示区域坐标并产生显示区域鼠标消息。

#define HTERROR             (-2)                    //在屏幕的后面或在窗体之间的线上(使函数DefWindowProc产生一个警示音)

#define HTTRANSPARENT       (-1)                    //在一个被其它窗口覆盖的窗口中

#define HTNOWHERE           0                        //在屏幕背景或窗口之间的分界线

#define HTCLIENT            1                        //在客户区中

#define HTCAPTION           2                        //在标题栏中

#define HTSYSMENU           3                        //在一个窗口菜单栏或子窗口的关闭按钮上

#define HTGROWBOX           4                        //在尺寸框中

#define HTSIZE              HTGROWBOX                //同HTGROWBOX

#define HTMENU              5                        //在菜单区域

#define HTHSCROLL           6                        //在水平滚动条上

#define HTVSCROLL           7                        //在垂直滚动条上

#define HTMINBUTTON         8                        //在最小化按钮上

#define HTMAXBUTTON         9                        //在最大化按钮上

#define HTLEFT              10                        //在窗口的左边框上

#define HTRIGHT             11                        //在窗口的右边框上

#define HTTOP               12                        //在窗口水平边框的上方

#define HTTOPLEFT           13                        //在窗口边框的左上角

#define HTTOPRIGHT          14                        //在窗口边框的右上角

#define HTBOTTOM            15                        //在窗口的水平边框的底部

#define HTBOTTOMLEFT        16                        //在窗口边框的左下角

#define HTBOTTOMRIGHT       17                        //在窗口边框的右下角

#define HTBORDER            18                        //在不具有可变大小边框的窗口的边框上

#define HTREDUCE            HTMINBUTTON                //同HTMINBUTTON

#define HTZOOM              HTMAXBUTTON                //同HTMAXBUTTON

#define HTSIZEFIRST         HTLEFT                    //同HTLEFT

#define HTSIZELAST          HTBOTTOMRIGHT             //同HTBOTTOMRIGHT

#define HTOBJECT            19                        //忽略该标识符, 已废弃

#define HTCLOSE             20                        //在关闭按钮上

#define HTHELP              21                        //在帮助按钮上
#include<windows.h>

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)

{

    static TCHAR szAppName[] = TEXT("Mouse Move");

    HWND hwnd;

    MSG msg;

    WNDCLASS wndclass;

    wndclass.hInstance = hInstance;

    wndclass.lpfnWndProc = WndProc;

    wndclass.lpszClassName = szAppName;

    wndclass.style = CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS;

    wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);

    wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);

    wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);

    wndclass.cbClsExtra = ;

    wndclass.cbWndExtra = ;

    wndclass.lpszMenuName = ;

    if (!RegisterClass(&wndclass))

    {

        MessageBox(NULL, TEXT("错误, 无法注册窗口类."), TEXT("错误"), MB_OK);

        return ;

    }

    hwnd = CreateWindow(szAppName, TEXT("Mouse Move"),

        WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT,

        , ,

        NULL, NULL, hInstance, NULL);

    ShowWindow(hwnd, iCmdShow);

    UpdateWindow(hwnd);

    while (GetMessage(&msg, NULL, , ))

    {

        TranslateMessage(&msg);

        DispatchMessage(&msg);

    }

    return msg.wParam;

}

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)

{

    TCHAR szBuffer[];

    static POINT pt;

    switch (message) {

    case WM_NCLBUTTONDOWN:

        pt.x = LOWORD(lParam);

        pt.y = HIWORD(lParam);

        ScreenToClient(hwnd, &pt);

        switch (wParam) {

        case HTCAPTION:

            wsprintf(szBuffer, TEXT("击中标题栏，客户区坐标(%d, %d)"), pt.x, pt.y);

            MessageBox(hwnd, szBuffer, TEXT("test"), NULL);

            break;

        case HTMINBUTTON:

            wsprintf(szBuffer, TEXT("击中最小化，客户区坐标(%d, %d)"), pt.x, pt.y);

            MessageBox(hwnd, szBuffer, TEXT("test"), NULL);

            break;

        case HTMAXBUTTON:

            wsprintf(szBuffer, TEXT("击中最大化，客户区坐标(%d, %d)"), pt.x, pt.y);

            MessageBox(hwnd, szBuffer, TEXT("test"), NULL);

            break;

        }

        return ;

    }

    return DefWindowProc(hwnd, message, wParam, lParam);

}

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