private static Win32.SCROLLINFO VScrollInfo(TextBoxBase richTextBox, int mask)
{
Win32.SCROLLINFO info = new Win32.SCROLLINFO();
info.fMask = mask;
info.cbSize = Marshal.SizeOf(info.GetType());
Win32.GetScrollInfo(richTextBox.Handle, Win32.SB_VERT, ref info);
return(info);
}
/// <summary>
/// gets the position where the scroll thumb is released
/// </summary>
public int GetScrollThumbPosition()
{
Win32.SCROLLINFO si = new Win32.SCROLLINFO();
si.fMask = 0x10;
bool r = Win32.GetScrollInfo(
new HandleRef(_parent, _parent.Handle),
this.Orientation, si);
return si.nTrackPos;
}
/// <summary>
/// gets the position where the scroll thumb is released
/// </summary>
public int GetScrollThumbPosition()
{
Win32.SCROLLINFO si = new Win32.SCROLLINFO();
si.fMask = 0x10;
bool r = Win32.GetScrollInfo(
new HandleRef(_parent, _parent.Handle),
this.Orientation, si);
return(si.nTrackPos);
}
/// <summary>
/// Позиция вертикального скролла
/// </summary>
internal static int GetVScrollPos(TextBoxBase richTextBox)
{
Win32.SCROLLINFO info = VScrollInfo(richTextBox, Win32.SIF_ALL);
if (info.nTrackPos == 0)
{
if (richTextBox.GetCharIndexFromPosition(new Point(2, 2)) == 0)
{
return(0);
}
return(info.nPos);
}
return(info.nTrackPos);
}
/// <summary>
/// Позиция вертикального скролла
/// </summary>
internal static void SetVScrollPos(TextBoxBase richTextBox, int nPos)
{
Win32.SCROLLINFO info = new Win32.SCROLLINFO();
info.cbSize = Marshal.SizeOf(info);
info.fMask = Win32.SIF_POS;
info.nPos = nPos;
int oldPos = GetVScrollPos(richTextBox);
Win32.SetScrollInfo(richTextBox.Handle, Win32.SB_VERT, ref info, true);
int newPos = GetVScrollPos(richTextBox);
IntPtr ptrWparam = new IntPtr(Win32.SB_THUMBTRACK + 0x10000 * newPos);
IntPtr ptrLparam = new IntPtr(0);
Win32.SendMessage(richTextBox.Handle, WM_VSCROLL, ptrWparam, ptrLparam);
}
/// <summary>
/// updates the data to the visual interface
/// </summary>
public void UpdateScrollInfo()
{
if (_parent.IsHandleCreated && _visible)
{
Win32.SCROLLINFO si = new Win32.SCROLLINFO();
si.cbSize = Marshal.SizeOf(typeof(Win32.SCROLLINFO));
si.fMask = 0x17;
si.nMin = _minimum;
si.nMax = _maximum;
si.nPage = this.PageSize;
si.nPos = _value;
si.nTrackPos = 0;
Win32.SetScrollInfo(
new HandleRef(_parent, _parent.Handle),
this.Orientation, si, true);
}
}
/// <summary>
/// updates the data to the visual interface
/// </summary>
public void UpdateScrollInfo()
{
if (_parent.IsHandleCreated && _visible)
{
Win32.SCROLLINFO si = new Win32.SCROLLINFO();
si.cbSize = Marshal.SizeOf(typeof(Win32.SCROLLINFO));
si.fMask = 0x17;
si.nMin = _minimum;
si.nMax = _maximum;
si.nPage = this.PageSize;
si.nPos = _value;
si.nTrackPos = 0;
Win32.SetScrollInfo(
new HandleRef(_parent, _parent.Handle),
this.Orientation, si, true);
}
}
public static extern int SetScrollInfo(IntPtr hwnd, int bar, ref Win32.SCROLLINFO si, bool fRedraw);
public static extern int GetScrollInfo(IntPtr hWnd, int fnBar, ref Win32.SCROLLINFO info);
public void AddMessage(string log, string message)
{
RichTextBox box = FindLogWindow(log);
HandleRef hnd = new HandleRef(box, box.Handle);
Win32.SCROLLINFO scrollinfo = new Win32.SCROLLINFO(Win32.SIF_RANGE | Win32.SIF_PAGE | Win32.SIF_POS);
if (box.Visible)
{
Win32.SendMessage(hnd, Win32.WM_SETREDRAW, Win32.FALSE, 0);
}
// Remember the selection
int selstart = box.SelectionStart;
int sellength = box.SelectionLength;
// Remember where we were before adding the text
int oldmaxpos, oldpos;
Win32.GetScrollInfo(hnd, Win32.SB_VERT, ref scrollinfo);
oldmaxpos = scrollinfo.nMax;
oldpos = scrollinfo.nPos;
// Append the text
box.AppendText(message);
// Find out where we are now
int minpos, maxpos, pagesize;
Win32.GetScrollInfo(hnd, Win32.SB_VERT, ref scrollinfo);
minpos = scrollinfo.nMin;
maxpos = scrollinfo.nMax;
pagesize = (int)scrollinfo.nPage;
// Fix the selection (this breaks the scroll position!)
if (selstart > 0)
{
box.SelectionStart = selstart;
}
if (sellength > 0)
{
box.SelectionLength = sellength;
}
// Fix the scroll position
if (oldpos >= oldmaxpos - pagesize * 2) // Allow two extra lines leeway
// Only scroll to bottom if we WERE at the max (before text was added)
//Win32.SendMessage(box.Handle, Win32.EM_SETSCROLLPOS, 0, new Win32.POINT(0, maxpos - pagesize - 1));
{
Win32.RichTextBox_SetScrollPos(hnd, 0, maxpos - pagesize - 1);
}
else
{
// Return to same place we were in when text was added
//Win32.SendMessage(box.Handle, Win32.EM_SETSCROLLPOS, 0, new Win32.POINT(0, oldpos));
Win32.RichTextBox_SetScrollPos(hnd, 0, oldpos);
}
if (box.Visible)
{
Win32.SendMessage(hnd, Win32.WM_SETREDRAW, Win32.TRUE, 0);
box.Invalidate();
}
}
/// <summary>
/// Минимальная позиция вертикального скролла
/// </summary>
private static int VScrollPosMin(RichTextBox richTextBox)
{
Win32.SCROLLINFO info = VScrollInfo(richTextBox, Win32.SIF_RANGE);
return(info.nMin);
}
