custom canvas with itemssource

Question

hi,
i'm trying to create custom canvas with bindable itemsource of type object, i did the following:

         public IList<object> Items { get; private set; }

        public IEnumerable ItemsSource
        {
            get { return Items; }
            set
            {
                if (value == null)
                {
                    ClearValue(ItemsSourceProperty);
                }
                else
                {
                    SetValue(ItemsSourceProperty, value);
                }
            }
        }


        public static readonly DependencyProperty ItemsSourceProperty
            = DependencyProperty.Register("ItemsSource", typeof(IEnumerable), typeof(CanvasSupportsMovableWithItemsSource),
                 new FrameworkPropertyMetadata((IEnumerable)null, new PropertyChangedCallback(OnItemsSourceChanged)));

        private static void OnItemsSourceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
... ??

but i don't know how to implement OnItemsSourceChanged,
any help will be appreciated,

thanks in advance.

i'm using VS2019(last version), .NetCore3.1 Wpf Application.

Answer 1

You can refer to below example code to implement your code on needs:

  private static void OnItemsSourceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)  
        {  
            if (d != null && d is CanvasSupportsMovableWithItemsSource)  
            {  
                CanvasSupportsMovableWithItemsSource source = (CanvasSupportsMovableWithItemsSource)d;  
                source.ItemsSource = (IEnumerable)e.NewValue;  
            }  
        }  

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