void OnIsDropDownOpenChanged(bool newValue)
{
if (DropDown != null)
{
if (newValue)
{
DropDown.PlacementTarget = this;
DropDown.Placement = PlacementMode.Bottom;
DropDown.SetBinding(ContextMenu.IsOpenProperty, new Binding()
{
Source = this, Path = new PropertyPath(IsDropDownOpenProperty), Mode = BindingMode.TwoWay
});
}
else
{
DropDown.ClearValue(ContextMenu.IsOpenProperty);
DropDown.ClearValue(ContextMenu.PlacementTargetProperty);
DropDown.ClearValue(ContextMenu.PlacementProperty);
}
}
else
{
if (newValue)
{
if (_contextMenu != null)
{
return;
}
_contextMenu = new ContextMenu();
_contextMenu.PlacementTarget = this;
_contextMenu.Placement = PlacementMode.Bottom;
_contextMenu.SetBinding(ContextMenu.ItemsSourceProperty, new Binding()
{
Source = this, Path = new PropertyPath(DropDownItemsSourceProperty)
});
_contextMenu.SetBinding(ContextMenu.ItemContainerStyleProperty, new Binding()
{
Source = this, Path = new PropertyPath(DropDownItemStyleProperty)
});
_contextMenu.SetBinding(ContextMenu.IsOpenProperty, new Binding()
{
Source = this, Path = new PropertyPath(IsDropDownOpenProperty), Mode = BindingMode.TwoWay
});
}
else
{
_contextMenu.ClearValue(ContextMenu.IsOpenProperty);
_contextMenu = null;
}
}
}