private void ControlLocationChanged(object sender, EventArgs e)
{
ListPanelItem movingControl = sender as ListPanelItem;
if (movingControl == null || !movingControl.Moving)
{
return;
}
IOrderedEnumerable <Control> SortedControls = Panel.Controls.OfType <Control>().OrderBy(control => control.Top);
Panel.SuspendLayout();
foreach (Control control in SortedControls)
{
if (control == movingControl)
{
continue;
}
int controlMiddle = control.Top + (control.Height / 2);
if (control.Top < _snapToTop)
{
if (controlMiddle > movingControl.Top)
{
if (control.Top < _snapToTop)
{
_snapToTop = control.Top;
}
control.Top += (movingControl.Height + movingControl.Margin.Bottom);
}
}
else if (control.Top > _snapToTop + movingControl.Height)
{
if (controlMiddle < movingControl.Bottom)
{
control.Top = _snapToTop;
_snapToTop = control.Bottom + control.Margin.Bottom + movingControl.Margin.Top;
}
}
}
Panel.ResumeLayout();
}
private void AddItem(object item)
{
ListPanelItem control = new ListPanelItem(item);
control.Expand();
control.Icon = _itemIcon;
control.Left = control.Margin.Left;
control.Top = btnAdd.Top - btnAdd.Margin.Top + control.Margin.Top;
control.Width = Panel.Width - control.Margin.Horizontal;
control.StartMove += ControlStartingMove;
control.EndMove += ControlEndMove;
control.LocationChanging += ControlLocationChanging;
control.LocationChanged += ControlLocationChanged;
control.SizeChanged += ControlSizeChanged;
control.PropertyChanged += ControlPropertyChanged;
Panel.Controls.Add(control);
control.Focus();
}