private void ApplyScroll(RichTextBox Source, RichTextBox Target, ScrollBarDirection Direction)
{
// unhook target from relevant event, otherwise we end up in an infinite loop!
switch (Direction)
{
case ScrollBarDirection.SB_VERT:
{
Target.VScroll -= rtb_VScroll;
}
break;
case ScrollBarDirection.SB_HORZ:
{
Target.HScroll -= rtb_HScroll;
}
break;
}
IntPtr ptrLparam = new IntPtr(0);
IntPtr ptrWparam;
// Prepare scroll info struct
SCROLLINFO si = new SCROLLINFO();
si.cbSize = (uint)Marshal.SizeOf(si);
si.fMask = (uint)ScrollInfoMask.SIF_ALL;
// Get current scroller posion
GetScrollInfo(Source.Handle, (int)Direction, ref si);
// if we're tracking, set target to current track position
if ((si.nTrackPos > 0) || ((si.nTrackPos == 0) && (si.nPos != 0)))
{
si.nPos = si.nTrackPos;
}
// Reposition scroller
SetScrollInfo(Target.Handle, (int)Direction, ref si, true);
ptrWparam = new IntPtr(SB_THUMBTRACK + 0x10000 * si.nPos);
// send the relevant message to the target control, and rehook the event
switch (Direction)
{
case ScrollBarDirection.SB_VERT:
{
SendMessage(Target.Handle, WM_VSCROLL, ptrWparam, ptrLparam);
Target.VScroll += new EventHandler(this.rtb_VScroll);
}
break;
case ScrollBarDirection.SB_HORZ:
{
SendMessage(Target.Handle, WM_HSCROLL, ptrWparam, ptrLparam);
Target.HScroll += new EventHandler(this.rtb_HScroll);
}
break;
}
}
public static int GetScrollPosition(Control control, ScrollBarDirection direction)
{
var si = new SCROLLINFO
{
cbSize = Marshal.SizeOf <SCROLLINFO>(),
fMask = ScrollInfoMask.SIF_POS,
};
if (NativeMethods.GetScrollInfo(control.Handle, direction, ref si) == 0)
{
throw new Win32Exception();
}
return(si.nPos);
}
private static extern int GetScrollInfo(IntPtr hWnd, ScrollBarDirection fnBar, ref SCROLLINFO lpsi);
public static bool GetScrollInfo(Control ctrl, ref SCROLLINFO si, ScrollBarDirection scrollBarDirection)
{
if (ctrl != null)
{
si.cbSize = (uint)Marshal.SizeOf(si);
si.fMask = (int)ScrollInfoMask.SIF_ALL;
if (GetScrollInfo(ctrl.Handle, (int)scrollBarDirection, ref si))
return true;
}
return false;
}
public static extern bool ShowScrollBar(IntPtr hwnd, ScrollBarDirection scrollBar, bool show);
public void HideScrollBar(ScrollBarDirection type)
{
ShowScrollBar(this.Handle, (int)type, false);
}
private static extern int GetScrollInfo(IntPtr hWnd, ScrollBarDirection fnBar, ref SCROLLINFO lpsi);
public static extern bool ShowScrollBar(IntPtr hwnd, ScrollBarDirection scrollBar, [MarshalAs(UnmanagedType.Bool)] bool show);
public static extern bool ShowScrollBar(IntPtr hwnd, ScrollBarDirection scrollBar, bool show);
public static int GetScrollPosition(Control control, ScrollBarDirection direction)
{
var si = new SCROLLINFO
{
cbSize = Marshal.SizeOf<SCROLLINFO>(),
fMask = ScrollInfoMask.SIF_POS,
};
if (NativeMethods.GetScrollInfo(control.Handle, direction, ref si) == 0)
throw new Win32Exception();
return si.nPos;
}
public static extern bool ShowScrollBar(IntPtr hwnd, ScrollBarDirection scrollBar, [MarshalAs(UnmanagedType.Bool)] bool show);
public static extern bool ShowScrollBar(IntPtr hWnd, ScrollBarDirection wBar, bool bShow);
