/// <summary>
/// When overridden in a derived class, measures the size in layout required for child elements and determines a size for the <see cref="T:System.Windows.FrameworkElement" />-derived class.
/// </summary>
/// <param name="availableSize">The available size that this element can give to child elements. Infinity can be specified as a value to indicate that the element will size to whatever content is available.</param>
/// <returns>The size that this element determines it needs during layout, based on its calculations of child element sizes.</returns>
protected override Size MeasureOverride(Size availableSize)
{
if (HeaderRenderer == null)
{
HeaderRenderer = new TabItemsHeaderRenderer();
}
var widest = 0d;
var tallest = 0d;
var availableItemSize = HeaderRenderer.GetClientRect(this, availableSize).Size;
foreach (var element in Children.OfType <UIElement>().Where(e => e.Visibility == Visibility.Visible))
{
element.Measure(availableItemSize);
widest = Math.Max(widest, element.DesiredSize.Width);
tallest = Math.Max(tallest, element.DesiredSize.Height);
}
base.MeasureOverride(availableSize);
if (!double.IsInfinity(availableSize.Width) && !double.IsInfinity(availableSize.Height))
{
return(availableSize);
}
return(new Size(widest, tallest));
}
/// <summary>
/// Draws the content of a <see cref="T:System.Windows.Media.DrawingContext" /> object during the render pass of a <see cref="T:System.Windows.Controls.Panel" /> element.
/// </summary>
/// <param name="dc">The <see cref="T:System.Windows.Media.DrawingContext" /> object to draw.</param>
protected override void OnRender(DrawingContext dc)
{
base.OnRender(dc);
if (HeaderRenderer == null)
{
HeaderRenderer = new TabItemsHeaderRenderer();
}
HeaderRenderer.Render(dc, this);
}
/// <summary>
/// Invoked when an unhandled <see cref="E:System.Windows.UIElement.MouseLeftButtonDown" /> routed event is raised on this element. Implement this method to add class handling for this event.
/// </summary>
/// <param name="e">The <see cref="T:System.Windows.Input.MouseButtonEventArgs" /> that contains the event data. The event data reports that the left mouse button was pressed.</param>
protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
{
if (HeaderRenderer == null)
{
HeaderRenderer = new TabItemsHeaderRenderer();
}
var position = e.GetPosition(this);
HeaderRenderer.MouseClick(position, e, this);
base.OnMouseLeftButtonDown(e);
}
/// <summary>
/// When overridden in a derived class, positions child elements and determines a size for a <see cref="T:System.Windows.FrameworkElement" /> derived class.
/// </summary>
/// <param name="finalSize">The final area within the parent that this element should use to arrange itself and its children.</param>
/// <returns>The actual size used.</returns>
protected override Size ArrangeOverride(Size finalSize)
{
if (HeaderRenderer == null)
{
HeaderRenderer = new TabItemsHeaderRenderer();
}
var clientRect = HeaderRenderer.GetClientRect(this, finalSize);
foreach (var element in Children.OfType <UIElement>().Where(e => e.Visibility == Visibility.Visible))
{
element.Arrange(clientRect);
}
base.ArrangeOverride(finalSize);
return(clientRect.Size);
}
