Add n rectangles to canvas with MVVM in WPF

Question

I want to add a set of rectangles to the main window of my mvvm application. In my viewModel I\'ve got a collection of objects which I convert to System.Windows.Shapes.Recta

Answer 1

In a proper MVVM approach you would have a view model with an abstract representation of a list of rectangles, e.g. like this:

public class RectItem
{
    public double X { get; set; }
    public double Y { get; set; }
    public double Width { get; set; }
    public double Height { get; set; }
}

public class ViewModel
{
    public ObservableCollection RectItems { get; set; }
}

Then you would have a view that uses an ItemsControl to visualize a collection of such Rect items. The ItemsControl would have a Canvas as its ItemsPanel and an appropriate ItemContainerStyle and ItemTemplate which each bind to the appropriate view model properties. It might look like this:

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An alternative without Bindings in Style Setters (which don't work in UWP) might look like this: