95 lines
3.0 KiB
C#
95 lines
3.0 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Runtime.InteropServices;
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namespace CPlus_GW
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{
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class Scroll
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{
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[DllImport("user32.dll")]
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[return: MarshalAs(UnmanagedType.Bool)]
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static extern bool GetScrollInfo(IntPtr hwnd, int fnBar, ref SCROLLINFO lpsi);
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[DllImport("user32.dll")]
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static extern int SetScrollInfo(IntPtr hwnd, int fnBar, [In] ref SCROLLINFO lpsi, bool fRedraw);
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[DllImport("User32.dll", CharSet = CharSet.Auto, EntryPoint = "SendMessage")]
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static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);
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struct SCROLLINFO
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{
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public uint cbSize;
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public uint fMask;
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public int nMin;
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public int nMax;
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public uint nPage;
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public int nPos;
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public int nTrackPos;
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}
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enum ScrollBarDirection
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{
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SB_HORZ = 0,
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SB_VERT = 1,
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SB_CTL = 2,
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SB_BOTH = 3
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}
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enum ScrollInfoMask
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{
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SIF_RANGE = 0x1,
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SIF_PAGE = 0x2,
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SIF_POS = 0x4,
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SIF_DISABLENOSCROLL = 0x8,
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SIF_TRACKPOS = 0x10,
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SIF_ALL = SIF_RANGE + SIF_PAGE + SIF_POS + SIF_TRACKPOS
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}
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const int WM_VSCROLL = 277;
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const int SB_LINEUP = 0;
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const int SB_LINEDOWN = 1;
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const int SB_THUMBPOSITION = 4;
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const int SB_THUMBTRACK = 5;
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const int SB_TOP = 6;
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const int SB_BOTTOM = 7;
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const int SB_ENDSCROLL = 8;
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// Scrolls a given textbox. handle: an handle to our textbox. pixels: number of pixels to scroll.
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/// <summary>
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/// scrols
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/// </summary>
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/// <param name="handle">rich text box handle</param>
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/// <param name="pixels"></param>
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public static void scroll(IntPtr handle, int pixels)
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{
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IntPtr ptrLparam = new IntPtr(0);
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IntPtr ptrWparam;
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// Get current scroller posion
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SCROLLINFO si = new SCROLLINFO();
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si.cbSize = (uint)Marshal.SizeOf(si);
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si.fMask = (uint)ScrollInfoMask.SIF_ALL;
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GetScrollInfo(handle, (int)ScrollBarDirection.SB_VERT, ref si);
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// Increase posion by pixles
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if (si.nPos < (si.nMax - si.nPage))
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si.nPos += pixels;
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else
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{
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ptrWparam = new IntPtr(SB_ENDSCROLL);
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SendMessage(handle, WM_VSCROLL, ptrWparam, ptrLparam);
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}
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// Reposition scroller
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SetScrollInfo(handle, (int)ScrollBarDirection.SB_VERT, ref si, true);
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// Send a WM_VSCROLL scroll message using SB_THUMBTRACK as wParam
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// SB_THUMBTRACK: low-order word of wParam, si.nPos high-order word of wParam
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ptrWparam = new IntPtr(SB_THUMBTRACK + 0x10000 * si.nPos);
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SendMessage(handle, WM_VSCROLL, ptrWparam, ptrLparam);
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}
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}
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}
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