/// <summary>
/// Overrided to controll del scrolling of the customControl VScrollBar1
/// </summary>
/// <param name="m"></param>
/// <remarks></remarks>
protected override void WndProc(ref Message m)
{
if (!this.DesignMode && !(!this.Parent.CanFocus | (_win == null)))
{
int wndStyle = Win32.GetWindowLong(this._win.Handle, Win32.GWL_STYLE);
bool hsVisible = (wndStyle & Win32.WS_HSCROLL) != 0;
bool vsVisible = (wndStyle & Win32.WS_VSCROLL) != 0;
//debug
//Console.WriteLine("Visible ScrollBars: " + GetVisibleScrollbars(_win));
//ShowScrollBar(this._win.Handle, (int)ScrollBarDirection.SB_HORZ, false /*false*/);
//vertical
if (true)// (vsVisible || hsVisible)
{
int iWParam = (int)m.WParam;
int iLParam = (int)m.LParam;
uint sbCode = Win32.LoWord(m.WParam);
if (sbCode == Win32.SB_THUMBTRACK || sbCode == Win32.SB_THUMBPOSITION)
{
Win32.ScrollInfo siv = new Win32.ScrollInfo();
siv.cbSize = Marshal.SizeOf(siv);
siv.fMask = (int)Win32.ScrollInfoMask.SIF_ALL;
Win32.ScrollInfo sih = siv;
uint nPos = Win32.HiWord(m.WParam);
Win32.GetScrollInfo(this._win.Handle, (int)Win32.ScrollBarDirection.SB_VERT, ref siv);
Win32.GetScrollInfo(this._win.Handle, (int)Win32.ScrollBarDirection.SB_HORZ, ref sih);
if ((sih.nMax + 0) <= sih.nPage)
{
this.HScrollBar1.Visible = false;
}
else
{
this.HScrollBar1.Visible = true;
if (sih.nPage != 0)
{
this.HScrollBar1.Maximum = (sih.nMax - sih.nPage) + 1;
this.HScrollBar1.Minimum = sih.nMin;
this.HScrollBar1.Value = sih.nPos;
this.HScrollBar1.LargeChange = (int)Math.Round((double)(((double)sih.nMax) / ((double)sih.nPage)));
this.HScrollBar1.SyncThumbPositionWithLogicalValue();
}
}
if (vsVisible)
{
if ((siv.nMax + 0) < siv.nPage)
{
this.VScrollBar1.Visible = false;
}
else
{
this.VScrollBar1.Visible = true;
if (siv.nPage != 0)
{
this.VScrollBar1.Maximum = (siv.nMax - siv.nPage) + 1;
this.VScrollBar1.Minimum = siv.nMin;
this.VScrollBar1.Value = siv.nPos;
this.VScrollBar1.LargeChange = (int)Math.Round((double)(((double)siv.nMax) / ((double)siv.nPage)));
this.VScrollBar1.SyncThumbPositionWithLogicalValue();
}
}
}
}
}
}
base.WndProc(ref m);
}
