색상 리스트 박스 (WM_MEASUREITEM, WM_DRAWITEM, listbox)

#include <windows.h>

LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);
HINSTANCE g_hInst;
LPSTR lpszClass="ColorList";

int APIENTRY WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance
         ,LPSTR lpszCmdParam,int nCmdShow)
{
    HWND hWnd;
    MSG Message;
    WNDCLASS WndClass;
    g_hInst=hInstance;
    
    if(!hPrevInstance) {
        WndClass.cbClsExtra=0;
        WndClass.cbWndExtra=0;
        WndClass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
        WndClass.hCursor=LoadCursor(NULL,IDC_ARROW);
        WndClass.hIcon=LoadIcon(NULL,IDI_APPLICATION);
        WndClass.hInstance=hInstance;
        WndClass.lpfnWndProc=(WNDPROC)WndProc;
        WndClass.lpszClassName=lpszClass;
        WndClass.lpszMenuName=NULL;
        WndClass.style=CS_HREDRAW | CS_VREDRAW;
        RegisterClass(&WndClass);
    }
    hWnd=CreateWindow(lpszClass,lpszClass,WS_OVERLAPPEDWINDOW | WS_CLIPCHILDREN,
         CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,
         NULL,(HMENU)NULL,hInstance,NULL);
    ShowWindow(hWnd,nCmdShow);
    
    while(GetMessage(&Message,0,0,0)) {
        TranslateMessage(&Message);
        DispatchMessage(&Message);
    }
    return Message.wParam;
}

#define ID_LISTBOX 100
HWND hList;
COLORREF ColorTable[15]={RGB(0,0,0), RGB(255,255,255), RGB(255,0,0), RGB(0,255,0),
        RGB(0,0,255), RGB(255,255,0), RGB(255,0,255), RGB(0,255,255), RGB(128,128,128),
        RGB(128,0,0), RGB(0,128,0), RGB(0,0,128), RGB(128,128,0), RGB(128,0,128),
        RGB(0,128,128)
    };
COLORREF SelColor=RGB(255,255,255);
LRESULT CALLBACK WndProc(HWND hWnd,UINT iMessage,WPARAM wParam,LPARAM lParam)
{
    LPMEASUREITEMSTRUCT lpmis;
    LPDRAWITEMSTRUCT lpdis;
    HBRUSH bkBrush, ColorBrush, OldBrush;
    COLORREF Color;
    int i, index;
    PAINTSTRUCT ps;
    HDC hdc;
    switch(iMessage) {
    case WM_CREATE:
        // 오너 드로우 리스트 박스를 만든다.
        hList=CreateWindow("listbox",NULL,WS_CHILD | WS_VISIBLE | WS_BORDER |
            WS_VSCROLL | LBS_NOTIFY | LBS_OWNERDRAWFIXED,
            10,10,150,200,hWnd,(HMENU)ID_LISTBOX,g_hInst,NULL);

        // 항목 데이터에 색상값을 넣는다.
        for (i=0;i<15;i++) {
            SendMessage(hList,LB_ADDSTRING,0,(LPARAM)ColorTable[i]);
        }
        return 0;
    case WM_MEASUREITEM:
        // 각 항목의 높이는 24픽셀이다.
        lpmis=(LPMEASUREITEMSTRUCT)lParam;
        lpmis->itemHeight=24;
        return TRUE;
    case WM_DRAWITEM:
        lpdis=(LPDRAWITEMSTRUCT)lParam;

        // 선택 상황에 따라 파란색 배경을 출력한다.
        if (lpdis->itemState & ODS_SELECTED) {
            bkBrush=CreateSolidBrush(RGB(0,0,255));
        }
        else {
            bkBrush=CreateSolidBrush(RGB(255,255,255));
        }
        FillRect(lpdis->hDC, &lpdis->rcItem, bkBrush);

        // 색상 바를 출력한다.
        Color=(COLORREF)SendMessage(lpdis->hwndItem, LB_GETITEMDATA, lpdis->itemID, 0);
        ColorBrush=CreateSolidBrush(Color);
        OldBrush=(HBRUSH)SelectObject(lpdis->hDC, ColorBrush);
        Rectangle(lpdis->hDC,lpdis->rcItem.left+5,lpdis->rcItem.top+2,
            lpdis->rcItem.right-5, lpdis->rcItem.bottom-2);
        SelectObject(lpdis->hDC, OldBrush);
        DeleteObject(bkBrush);
        DeleteObject(ColorBrush);
        return TRUE;
    case WM_COMMAND:
        // 선택된 항목의 항목 데이터로부터 색상값을 구하고 다시 그린다.
        switch (LOWORD(wParam)) {
        case ID_LISTBOX:
            switch (HIWORD(wParam)) {
            case LBN_SELCHANGE:
                index=SendMessage(hList, LB_GETCURSEL, 0, 0);
                SelColor=(COLORREF)SendMessage(hList, LB_GETITEMDATA, index, 0);
                InvalidateRect(hWnd, NULL, TRUE);
            }
        }
        return 0;
    case WM_PAINT:
        // 선택된 색상으로 원을 그린다.
        hdc=BeginPaint(hWnd, &ps);
        ColorBrush=CreateSolidBrush(SelColor);
        OldBrush=(HBRUSH)SelectObject(hdc, ColorBrush);
        Ellipse(hdc,200,10,400,200);
        SelectObject(hdc, OldBrush);
        DeleteObject(ColorBrush);
        EndPaint(hWnd, &ps);
        return 0;
    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    }
    return(DefWindowProc(hWnd,iMessage,wParam,lParam));
}