滾動條重復winapic

我第一次制作滾動條，但不明白為什么當內容可滾動時我的滾動條有一個副本。這是它的外觀，我不知道您是否可以看到它，但這是一個螢屏截圖；一個滾動條是粗灰色的（想要保留的，看起來更像經典的滾動條），一個是左側的一個灰色小矩形。這兩個滾動條都可以作業并滾動我的程式。：

但是當內容不可滾動時，它看起來像這樣：

如果這有幫助，這是我的 ScrollBar.cpp：

#include "ScrollBar.h"

ScrollBar::ScrollBar(){}

ScrollBar::~ScrollBar(){
    RemoveWindowSubclass(hWnd, scrollProc, IDC_STATIC);
    delete con;
}


ScrollBar::ScrollBar(HWND hWnd, HINSTANCE hInst) : hWnd(hWnd),hInst(hInst) {
    this->hWndParent = GetParent(hWnd);
    con = new Controls(hWndParent);
}

void ScrollBar::createScroll(int x, int y, int w, int h, bool stickRight, bool stickBottom) {
    this->x = x;
    this->y = y;
    this->width = w;
    this->height = h;

    hScroll = con->create("scrollbar", WS_VISIBLE | WS_CHILD | SBS_VERT, x, y, width, height,"scrollBar","",0, stickRight, stickBottom);
    //Creates like this
    /// CreateWindowEx(0, type, text, styles, cData.x, cData.y, cData.width, cData.height, hWnd, (HMENU)id, NULL, (LPVOID)lParam);

    SetWindowSubclass(hScroll, scrollProc, IDC_STATIC, (DWORD_PTR)this);
    SetWindowSubclass(hWndParent, scrollProc, IDC_STATIC, (DWORD_PTR)this);

    con->setEventListener();
}


void ScrollBar::setScrollRange(int scrollMaxHeight) {
    scrollMaxH = scrollMaxHeight == -1 ? scrollMaxH : scrollMaxHeight;
    SCROLLINFO si = { 0 };
    si.cbSize = sizeof(si);
    si.fMask = SIF_RANGE;
    si.nMin = 0;
    si.nMax = scrollMaxH;

    SetScrollInfo(hScroll, SB_VERT, &si, false);

}


void ScrollBar::setScrollSize() {

    SCROLLINFO oSi = { 0 };
    oSi.cbSize = sizeof(oSi);
    oSi.fMask = SIF_RANGE | SIF_PAGE | SIF_POS | SIF_TRACKPOS;
    GetScrollInfo(hScroll, SB_VERT, &oSi);


    RECT rect = GetLocalCoordinates(hWnd);
    int width = rect.right - rect.left;
    int height = rect.bottom - rect.top;



    SCROLLINFO si = { 0 };

    si.cbSize = sizeof(si);
    si.fMask = SIF_PAGE;
    si.nPage = height;

    SetScrollInfo(hScroll, SB_VERT, &si, TRUE);

    si.fMask = SIF_RANGE | SIF_PAGE | SIF_POS | SIF_TRACKPOS;

    GetScrollInfo(hScroll, SB_VERT, &si);

    int res = oSi.nPos - si.nPos;

    if (res > 0) {

        setChildScrollOffset(hWnd, res);
    }
}


void ScrollBar::handleVScroll(int action,int thum) {
    int nPos;
    int nOldPos;

    SCROLLINFO si = { 0 };

    si.cbSize = sizeof(si);
    si.fMask = SIF_RANGE | SIF_PAGE | SIF_POS | SIF_TRACKPOS;
    GetScrollInfo(hScroll, SB_VERT, &si);

    nOldPos = si.nPos;

    switch (action)
    {
    case SB_TOP:
        nPos = si.nMin;
        break;

    case SB_BOTTOM:
        nPos = si.nMax;
        break;

    case SB_LINEUP:
        nPos = si.nPos - 30;
        break;

    case SB_LINEDOWN:
        nPos = si.nPos   30;
        break;

    case SB_PAGEUP:
        nPos = si.nPos - 30;
        break;

    case SB_PAGEDOWN:
        nPos = si.nPos   30;
        break;

    case SB_THUMBTRACK:
        nPos = thum;
        break;

    default:
        nPos = si.nPos;
        break;
    }

    SetScrollPos(hScroll, SB_VERT, nPos, TRUE);

    nPos = GetScrollPos(hScroll, SB_VERT);


    if (nOldPos != nPos) {
        ScrollWindowEx(hWnd, 0, nOldPos - nPos, NULL, NULL, NULL, NULL,
            SW_INVALIDATE | SW_ERASE | SW_SCROLLCHILDREN);
        UpdateWindow(hWnd);
        setChildScrollOffset(hWnd, nOldPos - nPos);
    }
}

void ScrollBar::setChildScrollOffset(HWND h, int offset) {
    Controls* childsCon = reinterpret_cast<Controls*>(GetWindowLongPtr(h, GWLP_USERDATA));
    for (auto it : childsCon->sControls)
    {
        childsCon->getControlItem(it.first)->y  = offset;
    }
}

LRESULT CALLBACK ScrollBar::scrollProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam, UINT_PTR uIdSubclass, DWORD_PTR dwRefData) {
    ScrollBar* lpData = (ScrollBar*)dwRefData;

    HDC hdc = (HDC)wParam;
    PAINTSTRUCT ps;
    HBRUSH hbrBackground;


    switch (uMsg) {
    
    case WM_SIZE:
    {
        lpData->setScrollSize();
        break;
    }
    case WM_VSCROLL:
    {
        lpData->handleVScroll(LOWORD(wParam), HIWORD(wParam));
        return true;
    }
    case WM_MOUSEWHEEL:
    {

        short zDelta = (short)(0xFFFF & (wParam >> 16));
        if (zDelta > 0)
            PostMessage(lpData->hScroll, WM_VSCROLL, SB_LINEUP, NULL);
        else
            PostMessage(lpData->hScroll, WM_VSCROLL, SB_LINEDOWN, NULL);
        return 0;
    }
    }
    return DefSubclassProc(hWnd, uMsg, wParam, lParam);
}

uj5u.com熱心網友回復：

我是盲人，所以看不到你的螢屏截圖，但你的父視窗有 WS_VSCROLL 嗎？（您不顯示與該視窗關聯的樣式）。如果是這樣洗掉它，WS_VSCROLL 會在視窗的非客戶區添加一個不基于控制元件的滾動條。

uj5u.com熱心網友回復：

您需要區分Standard Scroll Bars 和 Scroll Bar Controls。滾動條控制元件是屬于 SCROLLBAR 視窗類的控制元件視窗。

關于如何創建滾動條的更多細節，我建議你可以參考檔案：如何創建滾動條

根據代碼，你要創建一個滾動條控制元件。因此，您應該創建一個沒有標準水平和垂直滾動條的視窗，然后使用 CreateWindowEx 函式通過指定 SCROLLBAR 視窗類來創建滾動條。

您能否展示一個最小的、可重復的樣本？

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