public SelectionStateChangedArgs(RoutedEvent routedEvent, FrameworkElement owner, SelectionBox selectionBox, bool isSelecting)
: base(routedEvent)
{
Owner = owner;
SelectionBox = selectionBox;
IsSelecting = isSelecting;
}
public SelectionBoxHandler(FrameworkElement owner, SelectionBox selectionBox)
{
AssertSelectionBoxProperties(owner, selectionBox);
SelectionBox = selectionBox;
Owner = owner;
ElementManager = new SelectionBoxElementManager(Owner, SelectionBox);
OwnerUIManager = new SelectionBoxOwnerUIManager(Owner, SelectionBox, ElementManager);
}
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.");
}
}
public SelectionBoxElementManager(FrameworkElement owner, SelectionBox selectionBox)
{
Owner = owner;
SelectionBox = selectionBox;
}
private SelectionBoxAdorner CreateSelectionBoxAdorner(FrameworkElement owner, SelectionBox selectionBox, Point startPoint)
{
return(new SelectionBoxAdorner(owner)
{
StartPoint = startPoint,
Color = selectionBox.Background,
Border = new Pen(selectionBox.BorderBrush, selectionBox.BorderThickness)
});
}
public SelectionBoxOwnerUIManager(FrameworkElement owner, SelectionBox selectionBox, SelectionBoxElementManager elementManager)
{
Owner = owner;
SelectionBox = selectionBox;
ElementManager = elementManager;
}
