/// <summary>
/// Override the resize event to force a re-layout of the content.
/// </summary>
/// <param name="e">Resize event arguments</param>
protected override void OnResize(EventArgs e)
{
if (!_inLayout)
{
int index = 0;
while (index < Controls.Count)
{
CanvasItem item = (CanvasItem)Controls[index];
item.SetBounds(0, 0, ClientRectangle.Width, 0, BoundsSpecified.Width);
++index;
}
LayoutControls(null);
}
}
/// <summary>
/// Layout all the canvas items from either the given item or from
/// the start if null is specified.
/// </summary>
public void LayoutControls(CanvasItem firstControl)
{
if (!_inLayout)
{
bool layoutAll = (firstControl == null);
_inLayout = true;
int index = (layoutAll) ? 0 : Controls.IndexOf(firstControl);
if (index >= 0)
{
Point point;
if (index > 0)
{
point = Controls[index - 1].Location;
point.Y += Controls[index - 1].Height;
}
else
{
point = AutoScrollPosition;
}
int topOffset = Math.Abs(point.Y);
int yCount = 0;
while (index < Controls.Count && (layoutAll || yCount < ClientRectangle.Bottom * 2))
{
CanvasItem item = (CanvasItem)Controls[index];
BoundsSpecified flags = BoundsSpecified.None;
if (item.Bounds.X != point.X)
{
flags |= BoundsSpecified.X;
}
if (item.Bounds.Y != point.Y)
{
flags |= BoundsSpecified.Y;
}
if (item.Bounds.Width != ClientRectangle.Width)
{
flags |= BoundsSpecified.Width;
}
if (item.Bounds.Height != item.Height)
{
flags |= BoundsSpecified.Height;
}
item.SetBounds(point.X, point.Y, ClientRectangle.Width, item.Height, flags);
point.Y += item.Height;
yCount += item.Height - topOffset;
topOffset = 0;
++index;
}
// If the collection changed then we need to update the virtual display
// rectangle bounds too.
if (_displayRectUpdate)
{
while (index < Controls.Count)
{
CanvasItem item = (CanvasItem)Controls[index++];
point.Y += item.Height;
}
AutoScrollMinSize = new Size(DisplayRectangle.Width, point.Y);
_displayRectUpdate = false;
}
}
_inLayout = false;
}
}
