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我正在使用 SetScrollInfo API 在我的richtextbox(winforms)中滚动文本。我有一个计时器,每个刻度我需要滚动一个像素。一切都在较短的文本上完美运行。在较长的文本上,滚动方法滚动超过 1 个像素。我认为这与滚动条的有限部分有关。我怀疑最多有 65536 个零件,但也许我错了。调用 GetScrollInfo() 后 si.nMax = 65535 时出现问题

是否有任何解决方案可以在较长的文本上滚动一个像素?

// Scrolls a given textbox. handle: an handle to our textbox. pixels: number of pixels to scroll.
    void scroll(IntPtr handle, int pixels)
    {
        mScrollsCounter++;
        IntPtr ptrLparam = new IntPtr(0);
        IntPtr ptrWparam;
        // Get current scroller posion

        SCROLLINFO si = new SCROLLINFO();
        si.cbSize = (uint)Marshal.SizeOf(si);
        si.fMask = (uint)ScrollInfoMask.SIF_ALL;
        GetScrollInfo(handle, (int)ScrollBarDirection.SB_VERT, ref si);

        // Increase posion by pixles
        if (si.nPos < (si.nMax - si.nPage))
            si.nPos += pixels;
        else
        {
            ptrWparam = new IntPtr(SB_ENDSCROLL);
            t.Enabled = false;
            SendMessage(handle, WM_VSCROLL, ptrWparam, ptrLparam);
        }

        // Reposition scroller
        SetScrollInfo(handle, (int)ScrollBarDirection.SB_VERT, ref si, true);

        // Send a WM_VSCROLL scroll message using SB_THUMBTRACK as wParam
        // SB_THUMBTRACK: low-order word of wParam, si.nPos high-order word of wParam
        ptrWparam = new IntPtr(SB_THUMBTRACK + 0x10000 * si.nPos);
        SendMessage(handle, WM_VSCROLL, ptrWparam, ptrLparam);
    } 
struct SCROLLINFO
        {
            public uint cbSize;
            public uint fMask;
            public int nMin;
            public int nMax;
            public uint nPage;
            public int nPos;
            public int nTrackPos;
        }
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1 回答 1

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而不是使用编码的像素数WM_VSCROLL(您可能将其scroll()作为pixels参数传递给您的函数),而是使用结构的nTrackPos成员SCROLLINFO

于 2012-12-20T18:58:11.753 回答