스크롤 바 - Win32

WS_HSCROLL
WS_VSCROLL

WM_HSCROLL

SB_LINEUP or SB_LINELEFT
SB_LINEDOWN or SB_LINERIGHT
SB_PAGEUP or SB_PAGELEFT
SB_PAGEDOWN or SB_PAGERIGHT
SB_THUMBTRACK
SB_THUMBPOSITION

WM_VSCROLL

SetScrollInfo()
GetScrollInfo()
SetScrollRange()
GetScrollRange()
SetScrollPos()
GetScrollPos()
ScrollWindow()

스크롤 성능 향상

모든 출력문의 x, y 좌표에서 스크롤 바의 Thumb 위치 값을 뺀다.

int APIENTRY WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance
      ,LPSTR lpszCmdParam,int nCmdShow)
{
    ...
    RegisterClass(&WndClass);

    hWnd=CreateWindow(lpszClass,lpszClass,WS_OVERLAPPEDWINDOW |
        WS_HSCROLL | WS_VSCROLL,
        CW_USEDEFAULT,CW_USEDEFAULT,640,480,
        NULL,(HMENU)NULL,hInstance,NULL);
    ShowWindow(hWnd,nCmdShow);

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

    return (int)Message.wParam;
}

#include <windowsx.h>

int yPos,xPos;
int yMax,xMax;

BOOL MsgCrk_OnCreate(HWND hWnd, LPCREATESTRUCT lpCreateStruct)
{
// {
    yPos=0;
    yMax=768;
/*    SetScrollRange(hWnd, SB_VERT, 0, yMax, TRUE);
    SetScrollPos(hWnd, SB_VERT, 0, TRUE); */

    xPos=0;
    xMax=1024;
/*    SetScrollRange(hWnd, SB_HORZ, 0, xMax, TRUE);
    SetScrollPos(hWnd, SB_HORZ, 0, TRUE); */
// }
    return TRUE;
}

void MsgCrk_OnDestroy(HWND hWnd)
{
    PostQuitMessage(0);
}

void MsgCrk_OnSize(HWND hWnd, UINT state, int cx, int cy)
{
    SCROLLINFO si;

    si.cbSize=sizeof(SCROLLINFO);
    si.fMask=SIF_ALL | SIF_DISABLENOSCROLL;
    si.nMin=0;
    si.nMax=yMax;
    si.nPage=cy;
    si.nPos=yPos;
    SetScrollInfo(hWnd, SB_VERT, &si, TRUE);

    si.nMax=xMax;
    si.nPage=cx;
    si.nPos=xPos;
    SetScrollInfo(hWnd, SB_HORZ, &si, TRUE);
/*
    xMax=1024-cx;
    yMax=768-cy;
    SetScrollRange(hWnd, SB_VERT, 0, yMax, TRUE);
    SetScrollPos(hWnd, SB_VERT, 0, TRUE);
    SetScrollRange(hWnd, SB_HORZ, 0, xMax, TRUE);
    SetScrollPos(hWnd, SB_HORZ, 0, TRUE); */
}

void MsgCrk_OnKey(HWND hWnd, UINT vk, BOOL fDown, int cRepeat, UINT flags)
{
    switch (vk) {
    case VK_UP:
        SendMessage(hWnd, WM_VSCROLL, MAKELONG(SB_PAGEUP,0), 0);
        break;
    case VK_DOWN:
        SendMessage(hWnd, WM_VSCROLL, MAKELONG(SB_PAGEDOWN,0), 0);
        break;
    case VK_LEFT:
        SendMessage(hWnd, WM_HSCROLL, MAKELONG(SB_PAGELEFT,0), 0);
        break;
    case VK_RIGHT:
        SendMessage(hWnd, WM_HSCROLL, MAKELONG(SB_PAGERIGHT,0), 0);
        break;
    }
}

void MsgCrk_OnHScroll(HWND hWnd, HWND hwndCtl, UINT code, int pos)
{
    // assert(hwndCtl == NULL)
    int xInc;

    xInc=0;
    switch (code) {
    case SB_LINELEFT:
        xInc=-1;
        break;
    case SB_LINERIGHT:
        xInc=1;
        break;
    case SB_PAGELEFT:
        xInc=-20;
        break;
    case SB_PAGERIGHT:
        xInc=20;
        break;
    case SB_THUMBTRACK:
        xInc=pos-xPos;
        break;
    }

    // 새로운 위치는 최소한 0 이상
    if (xPos+xInc < 0)
        xInc=-xPos;
    // 새로운 위치는 최대한 xMax 이하
    if (xPos+xInc > xMax)
        xInc=xMax-xPos;
    // 새로운 위치 계산
    xPos=xPos+xInc;
    // 스크롤시키고 썸 위치를 다시 계산한다.
    ScrollWindow(hWnd, -xInc, 0, NULL, NULL);
/*

or

    InvalidateRect(hWnd, NULL, TRUE);

*/
    SetScrollPos(hWnd, SB_HORZ, xPos, TRUE);
}

void MsgCrk_OnVScroll(HWND hWnd, HWND hwndCtl, UINT code, int pos)
{
    int yInc;

    yInc=0;
    switch (code) {
    case SB_LINEUP:
        yInc=-1;
        break;
    case SB_LINEDOWN:
        yInc=1;
        break;
    case SB_PAGEUP:
        yInc=-20;
        break;
    case SB_PAGEDOWN:
        yInc=20;
        break;
    case SB_THUMBTRACK:
    //case SB_THUMBPOSITION:
        yInc=pos-yPos;
        break;
    }

    // 새로운 위치는 최소한 0 이상
    if (yPos+yInc < 0)
        yInc=-yPos;
    // 새로운 위치는 최대한 yMax 이하
    if (yPos+yInc > yMax)
        yInc=yMax-yPos;
    // yInc=max(-yPos, min(yInc, yMax-yPos));
    // 새로운 위치 계산
    yPos=yPos+yInc;
    // 스크롤시키고 썸 위치를 다시 계산한다.
    ScrollWindow(hWnd, 0, -yInc, NULL, NULL);
    SetScrollPos(hWnd, SB_VERT, yPos, TRUE);
}
...
LRESULT CALLBACK WndProc(HWND hWnd,UINT iMessage,WPARAM wParam,LPARAM lParam)
{
    switch (iMessage) {
    HANDLE_MSG(hWnd, WM_CREATE, MsgCrk_OnCreate);
    HANDLE_MSG(hWnd, WM_DESTROY, MsgCrk_OnDestroy);
    HANDLE_MSG(hWnd, WM_SIZE, MsgCrk_OnSize);
    HANDLE_MSG(hWnd, WM_KEYDOWN, MsgCrk_OnKey);
    HANDLE_MSG (hWnd, WM_HSCROLL, MsgCrk_OnHScroll);
    HANDLE_MSG (hWnd, WM_VSCROLL, MsgCrk_OnVScroll);
    ...
    }

    return(DefWindowProc(hWnd, iMessage, wParam, lParam));
}

그래픽 스크롤바 - 커스텀 컨트롤

GrpScrl.zip

LRESULT CALLBACK WndProc(HWND hWnd,UINT iMessage,WPARAM wParam,LPARAM lParam)
{
    static HWND hHorz,hVert;

    switch (iMessage) {
    case WM_CREATE:
        hWndMain=hWnd;
        hHorz=CreateWindow("GrpScrl",NULL,WS_CHILD | WS_VISIBLE | GSS_HORZ,
            0,200,400,GetSystemMetrics(SM_CYHSCROLL),hWnd,(HMENU)1,g_hInst,NULL);
        SendMessage(hHorz,GSM_SETRANGE,0,400);
        hVert=CreateWindow("GrpScrl",NULL,WS_CHILD | WS_VISIBLE | GSS_VERT,
            400,0,GetSystemMetrics(SM_CXVSCROLL),200,hWnd,(HMENU)2,g_hInst,NULL);
        SendMessage(hVert,GSM_SETRANGE,0,200);
        SendMessage(hVert,GSM_SETBACKCOLOR,(WPARAM)RGB(255,255,0),0);
        SendMessage(hVert,GSM_SETTHUMBCOLOR,(WPARAM)RGB(255,0,0),0);
        return 0;
    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    case WM_HSCROLL:
        if (lParam == (LPARAM)hHorz) {
            ...
        }
        return 0;
    case WM_VSCROLL:
        if (lParam == (LPARAM)hVert) {
            ...
        }
        return 0;
    ...
    }
    return(DefWindowProc(hWnd,iMessage,wParam,lParam));
}

참조 사이트:

http://jjjryu.tistory.com/entry/%ED%8A%B8%EB%9E%99%EB%B0%94-%EC%BB%A8%ED%8A%B8%EB%A1%A4