/// <summary>
/// OnRender. Overriden to draw a vertical line on the right.
/// </summary>
/// <param name="drawingContext"></param>
protected override void OnRender(DrawingContext drawingContext)
{
base.OnRender(drawingContext);
if (DataGridHelper.IsGridLineVisible(DataGridOwner, /*isHorizontal = */ false))
{
double thickness = DataGridOwner.VerticalGridLineThickness;
Rect rect = new Rect(new Size(thickness, RenderSize.Height));
rect.X = RenderSize.Width - thickness;
drawingContext.DrawRectangle(DataGridOwner.VerticalGridLinesBrush, null, rect);
}
}
/// <summary>
/// Arrange. This is overriden so that the cell can position its content to account for a grid line on the right.
/// </summary>
/// <param name="arrangeSize">Arrange size</param>
protected override Size ArrangeOverride(Size arrangeSize)
{
// We don't need to adjust the Arrange position of the content. By default it is arranged at 0,0 and we're
// adding a line to the right. All we have to do is compress and extend the size, just like Measure.
if (DataGridHelper.IsGridLineVisible(DataGridOwner, /*isHorizontal = */ false))
{
double thickness = DataGridOwner.VerticalGridLineThickness;
Size returnSize = base.ArrangeOverride(DataGridHelper.SubtractFromSize(arrangeSize, thickness, /*height = */ false));
returnSize.Width += thickness;
return(returnSize);
}
else
{
return(base.ArrangeOverride(arrangeSize));
}
}
// Different parts of the DataGrid draw different pieces of the GridLines.
// Cells draw a single line on their right side.
/// <summary>
/// Measure. This is overridden so that the cell can extend its size to account for a grid line on the right.
/// </summary>
protected override Size MeasureOverride(Size constraint)
{
// Make space for the GridLine on the right:
// Remove space from the constraint (since it implicitly includes the GridLine's thickness),
// call the base implementation, and add the thickness back for the returned size.
if (DataGridHelper.IsGridLineVisible(DataGridOwner, /*isHorizontal = */ false))
{
double thickness = DataGridOwner.VerticalGridLineThickness;
Size desiredSize = base.MeasureOverride(DataGridHelper.SubtractFromSize(constraint, thickness, /*height = */ false));
desiredSize.Width += thickness;
return(desiredSize);
}
else
{
return(base.MeasureOverride(constraint));
}
}