private Thickness calculateThickness(GridPresenter host)
{
var grid = host.Grid;
if (grid == null)
{
return(new Thickness());
}
double baseThickness = host.GridBorderWidth;
switch (grid.Index)
{
case 0:
case 1:
case 3:
case 4:
return(new Thickness(baseThickness, baseThickness, 0, 0));
case 2:
case 5:
return(new Thickness(baseThickness, baseThickness, baseThickness, 0));
case 6:
case 7:
return(new Thickness(baseThickness, baseThickness, 0, baseThickness));
case 8:
return(new Thickness(baseThickness));
default:
return(new Thickness(0));
}
}
public BorderThicknessUpdator(GridPresenter host)
{
if (host == null)
{
throw new ArgumentNullException("host");
}
this.host = host;
DependencyPropertyDescriptor.FromProperty(
GridPresenter.GridBorderWidthProperty,
typeof(GridPresenter))
.AddValueChanged(host, UpdateNeeded);
DependencyPropertyDescriptor.FromProperty(
GridPresenter.GridProperty,
typeof(GridPresenter))
.AddValueChanged(host, UpdateNeeded);
}
private void updateElementBorderThickness(GridPresenter host)
{
host.SetGridBorderThickness(calculateThickness(host));
}