public static Rect GetContentBoundingBox(this FrameworkElement element, Visual relativeTo)
{
element.AssertParameterNotNull(nameof(element));
relativeTo.AssertNotNull(nameof(relativeTo));
return(element.GetVisualContent().GetBoundingBox(relativeTo));
}
public static FrameworkElement GetVisualContent(this FrameworkElement element)
{
element.AssertParameterNotNull(nameof(element));
if (element is ICustomContentOwner customContentOwner)
{
return(customContentOwner.ContentElement);
}
return(element);
}
private void AssertSelectionBoxProperties(FrameworkElement owner, SelectionBox selectionBox)
{
owner.AssertParameterNotNull(nameof(owner));
selectionBox.AssertParameterNotNull(nameof(selectionBox));
selectionBox.TargetType.AssertParameterNotNull(nameof(SelectionBox.TargetType));
selectionBox.TargetSelectionProperty.AssertParameterNotNull(nameof(SelectionBox.TargetSelectionProperty));
selectionBox.VisualTraverser.AssertParameterNotNull(nameof(SelectionBox.VisualTraverser));
if (!typeof(FrameworkElement).IsAssignableFrom(selectionBox.TargetType))
{
throw new Exception($"Error : Only FrameworkElements can be targeted by a SelectionBox. The given target type {SelectionBox.TargetType.Name} " +
$"does not extend FrameworkElement.");
}
if (selectionBox.TargetSelectionProperty == null ||
selectionBox.TargetSelectionProperty.ReadOnly ||
selectionBox.TargetSelectionProperty.PropertyType != typeof(bool))
{
throw new Exception($"Error : The target selection property represents the property if, which set, selects the UIElement of the item found inside the SelectionBox. " +
$"This cannot be null or readOnly and it's TargetType must be bool.");
}
}
/// <summary>
/// Ensures the specified FrameworkElement is unloaded before executing the specified action. <para/>
/// If the element is unloaded, the action will be executed right away. Otherwise, the execution will be delayed until the element is unloaded.
/// </summary>
/// <param name="frameworkElement"></param>
/// <param name="action"></param>
public static void EnsureUnloaded(this FrameworkElement frameworkElement, Action action)
{
frameworkElement.AssertParameterNotNull(nameof(frameworkElement));
action.AssertParameterNotNull(nameof(action));
if (!frameworkElement.IsLoaded)
{
action();
}
else
{
void unloadHandler(object sender, RoutedEventArgs e)
{
action();
frameworkElement.Unloaded -= unloadHandler;
}
frameworkElement.Unloaded += unloadHandler;
}
}