[핵심 API로 배우는 윈도우프로그래밍(강경우, 한빛아카데미)] 7장 5번 풀이

#include <Windows.h>
#include<tchar.h>
#include<string.h>
#include<math.h>
#include<stdio.h>
#include"resource.h"
//#pragma comment(linker,"/entry:WinMainCRTStartup /subsystem:console")
LRESULT CALLBACK FrameWndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam);
LRESULT CALLBACK ChildWndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam);
HINSTANCE hInst;
HWND hwndChild[2];
 
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpszCmdLine, int nCmdShow)
{
    HWND hwnd;
    MSG msg;
    WNDCLASS WndClass;
 
    hInst = hInstance;
    WndClass.style = CS_HREDRAW | CS_VREDRAW;
    WndClass.lpfnWndProc = FrameWndProc;
    WndClass.cbClsExtra = 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 = MAKEINTRESOURCE(IDR_MENU3);
    WndClass.lpszClassName = _T("Window Class Name");
    RegisterClass(&WndClass);
 
    WndClass.lpszMenuName = NULL;
    WndClass.lpfnWndProc = ChildWndProc;
    WndClass.lpszClassName = _T("Child Window Class Name");
    RegisterClass(&WndClass);
 
    hwnd = CreateWindow(
        _T("Window Class Name"),
        _T("박정호"),
        WS_OVERLAPPEDWINDOW,
        50,
        50,
        1000,
        700,
        NULL,
        NULL,
        hInstance,
        NULL);
 
    ShowWindow(hwnd, nCmdShow);
    UpdateWindow(hwnd);
 
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return (int)msg.wParam;
}
 
LRESULT CALLBACK FrameWndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
    HDC hdc;
    PAINTSTRUCT ps;
    RECT rect;
 
    switch (iMsg)
    {
    case WM_CREATE:
        break;
 
    case WM_COMMAND:
        switch (LOWORD(wParam))
        {
        case ID_SPLIT:
            GetClientRect(hwnd, &rect);
            hwndChild[0] = CreateWindowEx(WS_EX_CLIENTEDGE, _T("Child Window Class Name"), NULL, WS_CHILD | WS_VISIBLE, 0, 0, rect.right, rect.bottom / 2 - 1, hwnd, NULL, hInst, NULL);
            hwndChild[1] = CreateWindowEx(WS_EX_CLIENTEDGE, _T("Child Window Class Name"), NULL, WS_CHILD | WS_VISIBLE, 0, rect.bottom / 2 + 1, rect.right, rect.bottom / 2, hwnd, NULL, hInst, NULL);
 
            break;
        }
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
 
    }
    return DefWindowProc(hwnd, iMsg, wParam, lParam);
}
LRESULT CALLBACK ChildWndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
    static RECT rect;
    static HDC hdc;
    PAINTSTRUCT ps;
 
    static bool dirX[2] = { true,true }, dirY[2] = { true,true };
    static int x[2], y[2];
    static int selection = -1;
    static bool flag[2] = { false,false };
 
    switch (iMsg)
    {
    case WM_CREATE:
        x[0] = y[0] = x[1] = y[1] = 50;
        GetClientRect(hwnd, &rect);
        break;
    case WM_LBUTTONDOWN:
        if (hwnd == hwndChild[0])
            selection = 0;
        else
            selection = 1;
 
        flag[selection] = flag[selection] ? false : true;
 
        if (flag[selection])
            SetTimer(hwndChild[selection], selection, 10, NULL);
        else if (!flag[selection])
            KillTimer(hwndChild[selection], selection);
        break;
    case WM_TIMER:
        if (x[wParam]<20 || x[wParam]>rect.right - 20) dirX[wParam] = dirX[wParam] ? false : true;
        if (y[wParam]<20 || y[wParam]>rect.bottom - 20) dirY[wParam] = dirY[wParam] ? false : true;
 
        if (dirX[wParam])
            x[wParam]++;
        else
            x[wParam]--;
        if (dirY[wParam])
            y[wParam]++;
        else
            y[wParam]--;
        InvalidateRgn(hwndChild[wParam], NULL, TRUE);
 
        break;
    case WM_PAINT:
        hdc = BeginPaint(hwndChild[0], &ps);
        Ellipse(hdc, x[0] - 20, y[0] - 20, x[0] + 20, y[0] + 20);
        EndPaint(hwndChild[0], &ps);
 
        hdc = BeginPaint(hwndChild[1], &ps);
        Ellipse(hdc, x[1] - 20, y[1] - 20, x[1] + 20, y[1] + 20);
        EndPaint(hwndChild[1], &ps);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    }
 
    return DefMDIChildProc(hwnd, iMsg, wParam, lParam);
}