窗口 分割

#include <windows.h>
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
 
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
{
    HWND                hwnd;
    MSG         msg;
    WNDCLASS    wndclass;
    static char *szAppName = "Splitter Example";
    wndclass.style              = 0; //CS_HREDRAW | CS_VREDRAW;
    wndclass.lpfnWndProc        = WndProc;
    wndclass.cbClsExtra = 0;
    wndclass.cbWndExtra = 0;
    wndclass.hInstance  = hInstance;
    wndclass.hIcon              = LoadIcon(NULL, IDI_INFORMATION);
    wndclass.hCursor    = LoadCursor(NULL, IDC_ARROW);
    wndclass.hbrBackground      = (HBRUSH)GetStockObject(LTGRAY_BRUSH);
    wndclass.lpszMenuName       = NULL;
    wndclass.lpszClassName      = szAppName;
    RegisterClass(&wndclass);
    hwnd = CreateWindow(szAppName, szAppName,
                        WS_OVERLAPPEDWINDOW | WS_CLIPCHILDREN,
                        CW_USEDEFAULT, CW_USEDEFAULT,
                        400, 300,
                        NULL, NULL,
                        hInstance, 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 uMsg, WPARAM wParam, LPARAM lParam)
{
    HINSTANCE   hInst;
    RECT                rect;
    static HCURSOR      hCursor;
    static BOOL bSplitterMoving;
    static DWORD        dwSplitterPos;
    static HWND hWnd1, hWnd2;
    switch (uMsg)
    {
    case WM_CREATE:
        hInst = ((LPCREATESTRUCT) lParam) -> hInstance;
        hWnd1 = CreateWindowEx( WS_EX_CLIENTEDGE,
                                "edit", NULL,
                                WS_CHILD | WS_VISIBLE | WS_CLIPSIBLINGS | ES_MULTILINE | WS_VSCROLL,
                                0, 0, 0, 0,
                                hWnd, (HMENU) 1,
                                hInst, NULL );
        hWnd2 = CreateWindowEx( WS_EX_CLIENTEDGE,
                                "edit", NULL,
                                WS_CHILD | WS_VISIBLE | WS_CLIPSIBLINGS | ES_MULTILINE | WS_VSCROLL,
                                0, 0, 0, 0,
                                hWnd, (HMENU) 2,
                                hInst, NULL );
        hCursor = LoadCursor(NULL, MAKEINTRESOURCE(IDC_SIZENS));
        bSplitterMoving = FALSE;
        dwSplitterPos = 130;
        return 0;
    case WM_SIZE:
        /*
           If window is shrunk so that splitter now lies outside the
           window boundaries, move the splitter within the window.
        */
        if ((wParam != SIZE_MINIMIZED) && (HIWORD(lParam) < dwSplitterPos))
            dwSplitterPos = HIWORD(lParam) - 10;
        /* Adjust the children's size and position */
        MoveWindow(hWnd1, 0, 0, LOWORD(lParam), dwSplitterPos - 1, TRUE);
        MoveWindow(hWnd2, 0, dwSplitterPos + 2, LOWORD(lParam) , HIWORD(lParam) - dwSplitterPos - 2, TRUE);
        return 0;
    case WM_MOUSEMOVE:
        if (HIWORD(lParam) > 10) // do not allow above this mark
        {
            SetCursor(hCursor);
            if ((wParam == MK_LBUTTON) && bSplitterMoving)
            {
                GetClientRect(hWnd, &rect);
                if (HIWORD(lParam) > rect.bottom)
                    return 0;
                dwSplitterPos = HIWORD(lParam);
                SendMessage(hWnd, WM_SIZE, 0, MAKELPARAM(rect.right, rect.bottom));
            }
        }
        return 0;
    case WM_LBUTTONDOWN:
        SetCursor(hCursor);
        bSplitterMoving = TRUE;
        SetCapture(hWnd);
        return 0;
    case WM_LBUTTONUP:
        ReleaseCapture();
        bSplitterMoving = FALSE;
        return 0;
    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    }
    return DefWindowProc(hWnd, uMsg, wParam, lParam);
}