10 Windows编程——鼠标消息

和鼠标相关的三个属于：click，double-click，drag

鼠标消息和键盘消息不同：只要鼠标跨越某个窗口，或者在某个窗口中按键，消息。

客户去鼠标消息

WM_MOUSEMOVE

WM_[L,M,R] BUTTONDOWN

WM_[L,M,R] BUTTONUP

WM_[L,M,R] BUTTONDBLCLK

对于这些消息，lParam的低字节为x坐标，高字节为y坐标。
wParam只是鼠标按键以及shift和Ctr1按键的状态（这个和键盘消息相似）。
要测试鼠标按钮是否按下：MK_LBUTTON，MK_MBUTTON，MK_RBUTTON，MK_SHIFT，MK_CONTROL.

非客户区鼠标消息：
WM_NCMOUS EMOVE
WM_NCLBUTTONDOWN.
WM_NCLBUTTONUP
WM_NCLBUTTONDBLCLK

#include<Windows.h>
#include<WinUser.h>
#include<tchar.h>
#include<stdio.h>

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

int WinMain(HINSTANCE hInst, HINSTANCE tmp, LPSTR szCmd, int nShow)
{
    WNDCLASS WndClass;
    TCHAR* ClassName = TEXT("MyClass");
    HWND hwnd;
    MSG msg;

    WndClass.cbClsExtra = 0;
    WndClass.cbWndExtra = 0;
    WndClass.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
    WndClass.hCursor = LoadCursor(NULL, IDC_ARROW);
    WndClass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    WndClass.hInstance = hInst;
    WndClass.lpfnWndProc = WindProc;
    WndClass.lpszClassName = ClassName;
    WndClass.lpszMenuName = NULL;
    WndClass.style = CS_VREDRAW | CS_HREDRAW;

    RegisterClass(&WndClass);
    hwnd = CreateWindow(ClassName, TEXT("Hello"), WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 500, 300, NULL, NULL, hInst, NULL);
    ShowWindow(hwnd, nShow);
    UpdateWindow(hwnd);

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



LRESULT CALLBACK WindProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    HDC hdc;
    PAINTSTRUCT pt;
    TCHAR *rectwords = TEXT("我在学习鼠标消息");
    static int i;
    switch (message)
    {
    case WM_CREATE:
        return 0;
    case WM_SIZE:
        return 0;
    case WM_PAINT:
        hdc = BeginPaint(hwnd, &pt);
        Rectangle(hdc, 10, 10, 100, 100);
        if (i)
        {
            TextOut(hdc, 100, 10, rectwords, _tcslen(rectwords));
        }
        EndPaint(hwnd, &pt);
        return 0;
    case WM_CHAR:
        return 0;
    case WM_LBUTTONUP:
        i = 0;
        InvalidateRect(hwnd, NULL, TRUE);
        return 0;
    case WM_LBUTTONDOWN:
        InvalidateRect(hwnd, NULL, TRUE);
        if (LOWORD(lParam)>10 && LOWORD(lParam)<100 && HIWORD(lParam)>10 && HIWORD(lParam)<100)
        {
            i = 1;
        }
        return 0;
    case WM_MOUSEMOVE:
        hdc = GetDC(hwnd);
        if (wParam&MK_LBUTTON)
        {
            SetPixel(hdc, LOWORD(lParam), HIWORD(lParam), 0);
        }
        ReleaseDC(hwnd, hdc);
        return 0;
    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    default:
        break;
    }

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