/// <summary>
/// Opens the current instance of the <see cref="RadRadialMenu"/>.
/// </summary>
internal void Open()
{
if (this.TargetElement != null)
{
var behavior = RadRadialContextMenu.GetBehavior(this.TargetElement);
if (behavior != null)
{
behavior.AttachToTargetElement();
}
}
this.model.ShowView();
if (this.TargetElement != null)
{
PopupService.DisplayOverlay();
}
this.CalculateRingsAspectRatio();
if (this.model.viewState.StartAngleLevels.Count > 0)
{
this.model.Layout.StartAngle = this.model.viewState.StartAngleLevels[0];
this.model.UpdateRingsRadius();
}
}
private void Owner_LayoutUpdated(object sender, object e)
{
var menu = RadRadialContextMenu.GetMenu(this.Owner);
if (menu != null)
{
menu.LayoutUpdated -= this.Owner_LayoutUpdated;
this.PositionMenu(menu);
}
}
protected internal virtual void DetachFromTargetElement()
{
var menu = RadRadialContextMenu.GetMenu(this.Owner);
if (menu != null)
{
menu.TargetElement = null;
}
PopupService.Detach();
}
/// <summary>
/// It is used to detach the previous <see cref="RadRadialMenu"/> owner control.
/// </summary>
/// <param name="previousOwner"></param>
protected override void OnDetached(FrameworkElement previousOwner)
{
if (previousOwner != null)
{
this.UnsubscribeFromTargetEvents(previousOwner);
var menu = RadRadialContextMenu.GetMenu(previousOwner);
if (menu != null)
{
menu.LayoutUpdated -= this.Owner_LayoutUpdated;
}
base.OnDetached(previousOwner);
}
}
/// <summary>
/// It is used to position the <see cref="RadRadialMenu"/> and initiate menu position logic.
/// </summary>
protected internal virtual void AttachToTargetElement()
{
if (this.Owner == null)
{
return;
}
var menu = RadRadialContextMenu.GetMenu(this.Owner);
if (menu != null && (PopupService.CurrentAttachedMenu != menu ||
(PopupService.CurrentAttachedMenu != null && PopupService.CurrentAttachedMenu.TargetElement != this.Owner)))
{
menu.model.actionService.PushAction(
new DelegateAction(() =>
{
if (menu.TargetElement != null)
{
var behavior = RadRadialContextMenu.GetBehavior(menu.TargetElement);
if (behavior != null)
{
behavior.DetachFromTargetElement();
}
else
{
this.DetachFromTargetElement();
}
}
menu.TargetElement = this.Owner;
PopupService.Attach(menu);
if (menu.DesiredSize.Height == 0 || menu.DesiredSize.Width == 0)
{
menu.LayoutUpdated += this.Owner_LayoutUpdated;
}
else
{
this.PositionMenu(menu);
}
}));
}
}
public static void SetBehavior(DependencyObject obj, RadialMenuTriggerBehavior value)
{
var oldBehavior = RadRadialContextMenu.GetBehavior(obj);
var element = obj as FrameworkElement;
if (oldBehavior != null && element != null)
{
oldBehavior.Owner = null;
}
if (obj != null)
{
obj.SetValue(BehaviorProperty, value);
}
if (value != null && element != null)
{
value.Owner = element;
}
}