// set forcereposition if the vscroll pos does not change but something like a control resize may have messed about with the positioning
private void ScrollTo(int newscrollpos, bool forcereposition)
{
//System.Diagnostics.Debug.WriteLine("ScrollTo " + newscrollpos );
//System.Diagnostics.Debug.WriteLine("From " + Environment.StackTrace.StackTrace("ScrollTo",5));
int maxy = 0;
List <Point> cposnorm = new List <Point>();
Point flowpos = new Point(0, 0); // for flow
int dwidth = DisplayRectangle.Width;
int rowymax = 0;
foreach (Control c in Controls)
{
if (!(c is ExtScrollBar) && c.Visible) // if in a tab, when tab is turned on, we get a call but will all things invisible (it comes thru resize)
{ // therefore setting scroll pos to zero. This stage double checks we do not have controls
if (-c.Top > scrollpos) // below zero meaning we have lost scroll pos. If so, set it back
{
//System.Diagnostics.Debug.WriteLine(" Before Control " + c.Text + " " + c.Size + " " + c.Location + " " + c.Visible + " before " + scrollpos + " set to " + -c.Top);
scrollpos = -c.Top;
newscrollpos = scrollpos;
}
}
}
foreach (Control c in Controls)
{
if (!(c is ExtScrollBar) && c.Visible)
{
if (FlowControlsLeftToRight)
{
if (flowpos.X + c.Width + c.Margin.Horizontal >= dwidth && flowpos.X > 0)
{
flowpos = new Point(0, flowpos.Y + rowymax);
rowymax = 0;
}
cposnorm.Add(new Point(flowpos.X + c.Margin.Left, flowpos.Y + c.Margin.Top));
flowpos.X += c.Width + c.Margin.Horizontal;
rowymax = Math.Max(rowymax, c.Height + c.Margin.Vertical);
maxy = flowpos.Y + c.Height - 1 + c.Margin.Vertical;
}
else
{
cposnorm.Add(new Point(c.Left, c.Top + scrollpos));
maxy = Math.Max(maxy, c.Top + scrollpos + c.Height - 1); // -1 because top+height = 1 pixel beyond last displayed
}
}
//System.Diagnostics.Debug.WriteLine(" Control " + c.Name + " " + c.Size + " " + c.Location + " " + c.Visible + " maxy " + maxy);
}
int maxscr = maxy - ClientRectangle.Height + (ScrollBar?.LargeChange ?? 0); // large change is needed due to the way the scroll bar works (which matches the windows scroll bar)
if (maxy <= ClientRectangle.Height) // limit..
{
//System.Diagnostics.Debug.WriteLine(" Maxy <= Client Height, set to zero");
newscrollpos = 0;
}
else if (newscrollpos > maxscr)
{
newscrollpos = maxscr;
}
//System.Diagnostics.Debug.WriteLine(" Maxy " + maxy + " CH "+ ClientRectangle.Height + " maxscr " + maxscr + " new scr " + newscrollpos + " old scroll " + scrollpos);
if (newscrollpos != scrollpos || (FlowControlsLeftToRight && forcereposition)) // only need forcereposition on flowing
{
SuspendLayout();
ignorelocationchange++;
int posi = 0;
foreach (Control c in Controls)
{
if (!(c is ExtScrollBar) && c.Visible) // new! take into account visibility
{
c.Location = new Point(cposnorm[posi].X, cposnorm[posi].Y - newscrollpos);
posi++;
//System.Diagnostics.Debug.WriteLine(" flow and set " + c.Name + " to " + c.Location + " Using sp " + newscrollpos);
}
}
ignorelocationchange--;
ResumeLayout();
Update(); // force redisplay
}
if (ScrollBar != null)
{
ScrollBar.SetValueMaximumMinimum(newscrollpos, maxscr, 0);
//System.Diagnostics.Debug.WriteLine(" set bar from {0} to {1} maxscr {2} maxy {3} ClientH {4}", scrollpos, newscrollpos, maxscr , maxy , ClientRectangle.Height);
}
scrollpos = newscrollpos;
//System.Diagnostics.Debug.WriteLine("Set scroll pos to " + scrollpos);
}
// set forcereposition if the vscroll pos does not change but something like a control resize may have messed about with the positioning
private int ScrollTo(int newscrollpos, bool forcereposition)
{
//System.Diagnostics.Debug.WriteLine("Scroll panel is " + ClientRectangle + " curscrollpos " + scrollpos);
//System.Diagnostics.Debug.WriteLine("From " + Environment.StackTrace.StackTrace("ScrollTo",5));
int maxy = 0;
List <Point> cposnorm = new List <Point>();
Point flowpos = new Point(0, 0);
int dwidth = DisplayRectangle.Width;
int rowymax = 0;
foreach (Control c in Controls)
{
if (!(c is ExtScrollBar))
{
if (FlowControlsLeftToRight)
{
if (flowpos.X + c.Width + c.Margin.Horizontal >= dwidth && flowpos.X > 0)
{
flowpos = new Point(0, flowpos.Y + rowymax);
rowymax = 0;
}
cposnorm.Add(new Point(flowpos.X + c.Margin.Left, flowpos.Y + c.Margin.Top));
flowpos.X += c.Width + c.Margin.Horizontal;
rowymax = Math.Max(rowymax, c.Height + c.Margin.Vertical);
maxy = flowpos.Y + c.Height + c.Margin.Vertical;
}
else
{
cposnorm.Add(new Point(c.Left, c.Top + scrollpos));
maxy = Math.Max(maxy, c.Top + scrollpos + c.Height);
}
// System.Diagnostics.Debug.WriteLine("Control " + c.Text + " " + c.Size + " " + c.Location + " maxy " + maxy);
}
}
int maxscr = maxy - ClientRectangle.Height + (ScrollBar?.LargeChange ?? 0); // large change is needed due to the way the scroll bar works (which matches the windows scroll bar)
if (maxy <= ClientRectangle.Height) // limit..
{
newscrollpos = 0;
}
else if (newscrollpos > maxscr)
{
newscrollpos = maxscr;
}
// System.Diagnostics.Debug.WriteLine("Maxy " + maxy + " maxscr " + maxscr + " new scr " + newscrollpos + " old scroll " + scrollpos);
if (newscrollpos != scrollpos || (FlowControlsLeftToRight && forcereposition)) // only need forcereposition on flowing
{
SuspendLayout();
ignorelocationchange = true;
int posi = 0;
foreach (Control c in Controls)
{
if (!(c is ExtScrollBar))
{
c.Location = new Point(cposnorm[posi].X, cposnorm[posi].Y - newscrollpos);
posi++;
}
}
ignorelocationchange = false;
ResumeLayout();
Update(); // force redisplay
}
if (ScrollBar != null)
{
ScrollBar.SetValueMaximumMinimum(newscrollpos, maxscr, 0);
// System.Diagnostics.Debug.WriteLine("Scroll {0} to {1} maxscr {2} maxy {3} ClientH {4}", scrollpos, newscrollpos, maxscr , maxy , ClientRectangle.Height);
}
scrollpos = newscrollpos;
return(maxy);
}