/// <summary>
/// Returns a <see cref="Media.Rectangle"/> that represents the layout partition that is reserved for a child element<para></para>
/// It is equivalent to the rectangle returned by the <see cref="IUIElement.RenderTarget"/> property, modified to include eventual padding values
/// </summary>
/// <param name="element">The <see cref="IUIElement"/> instance to compute the layout slot of</param>
/// <returns>A <see cref="Media.Rectangle"/> that represents the layout partition that is reserved for a child element</returns>
public static Media.Rectangle GetLayoutSlot(IUIElement element)
{
IPaddedElement paddedElement;
Media.Point layoutSlotPosition;
Media.Size layoutSlotSize;
Media.Rectangle layoutSlot;
layoutSlotPosition = element.RenderTarget.Position;
layoutSlotSize = element.RenderTarget.Size;
if (typeof(IPaddedElement).IsAssignableFrom(element.GetType()))
{
paddedElement = (IPaddedElement)element;
layoutSlotPosition += new Media.Point(paddedElement.Padding.Left, paddedElement.Padding.Top);
layoutSlotSize = new Media.Size(layoutSlotSize.Width - paddedElement.Padding.Left - paddedElement.Padding.Right, layoutSlotSize.Height - paddedElement.Padding.Top - paddedElement.Padding.Bottom );
}
layoutSlot = new Media.Rectangle(layoutSlotPosition, layoutSlotSize);
return layoutSlot;
}
/// <summary>
/// When overriden in a class, this method allows the execution of code whenever the element has been rendered
/// </summary>
///<param name="drawingContext">The <see cref="DrawingContext"/> in which the element has been rendered</param>
protected override void OnRender(DrawingContext drawingContext)
{
Media.Size textSize;
Media.Rectangle layoutSlot;
if (!string.IsNullOrWhiteSpace(this.Text)
&& this.Foreground != null)
{
textSize = DrawingContext.MeasureText(this.Text, this.Font);
layoutSlot = LayoutInformation.GetLayoutSlot(this);
layoutSlot = new Media.Rectangle(new Media.Point(layoutSlot.Position.X - textSize.Width / 2, layoutSlot.Position.Y - textSize.Height / 2), layoutSlot.Size);
drawingContext.DrawText(this.Text, layoutSlot.Position, this.Font, this.Foreground);
}
}