I have a custom control, override of UIScrollView. When rendering two UIViews are rendered. One is the PDF, one is a layer above. The layer above contains a collection of texts which rendered at different places over the pdf.
I use MvvmCross so have a model. Collection of texts is observable. How can I bind the observable collection to the results which need to be rendered in the layer?
In short...pseudo
UIScrollViewWrapper
On draw create two layers
layer 1 is pdf image
layer above is view with texts.
Texts need to be bind and observed by Model.Texts (ObservableCollection<string>)
I tried:
var set = this.CreateBindingSet<ViewWithScrollView, ViewWithScrollViewModel>();
set.Bind(ScrollView.LayerView).For(x => x.LayerItems).To(vm => vm.LayerItems);
set.Apply();
The LayerView is MvxView for bindingcontext
Ok the solution
The own implementation of the scrollview will be:
public class MyOwnScrollView : UIScrollView, IUIScrollViewDelegate, IMvxBindable
{
//Implement the IMvxBindable
//Add property BindingContext
public IMvxBindingContext BindingContext { get; set; }
//Property for holding the datacontext
[MvxSetToNullAfterBinding]
public object DataContext
{
get { return BindingContext.DataContext; }
set { BindingContext.DataContext = value; }
}
public MyOwnScrollView()
{
//Call Mvx for creating the bindingcontext
this.CreateBindingContext()
}
//Create something where you can create the set voor fluent binding with the view model. For example
public void MyBindingToCreate()
{
var set = new new MvxFluentBindingDescriptionSet<AViewInMyScrollView, MyViewViewModel>(AViewInMyScrollView); //Because CreateBindingSet is part of MvxView and UIScrollView is not MvxView
set.Bind(AViewInMyScrollView).For(x => x.MyPropertyOfView).To(vm => vm.PropertyOfViewModel);
set.Apply();
}
And the place where you are using the ScrollView will be a binding to the datacontext
public partial class MyView : MvxView
{
public MyView() : base("MyView", null)
{
}
public override void ViewDidLoad()
{
base.ViewDidLoad();
var set = this.CreateBindingSet<MyView, MyViewViewModel>();
set.Bind(MyOwnScrollView).For(s => s.DataContext).To(vm => vm);
set.Apply();
}
}
PS. I will implement this in MvvmCross by own control. However, this can be used for all own controls!