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using System;
using Xamarin.Forms.Internals;
namespace Xamarin.Forms.Controls
{
public class NativeBindingGalleryPage : ContentPage
{
public StackLayout Layout { get; set; }
public bool NativeControlsAdded { get; set; }
NestedNativeViewModel ViewModel { get; set; }
public const string ReadyForNativeBindingsMessage = "ReadyForNativeBindings";
protected override void OnAppearing()
{
base.OnAppearing();
MessagingCenter.Send(this, ReadyForNativeBindingsMessage);
}
public NativeBindingGalleryPage()
{
var vm = new NestedNativeViewModel();
vm.FormsLabel = "Forms Label Binding";
vm.NativeLabel = "Native Label Binding";
vm.NativeLabelColor = Color.Red;
vm.Age = 45;
Layout = new StackLayout { Padding = 20, VerticalOptions = LayoutOptions.FillAndExpand };
var buttonNav = new Button { Text = "New Page" };
buttonNav.Clicked += (object sender, EventArgs e) =>
{
App.Current.MainPage = new ContentPage { Content = new Label { Text = "New page" } };
};
var button = new Button { Text = "Change BindingContext " };
button.Clicked += (object sender, EventArgs e) =>
{
vm = new NestedNativeViewModel();
vm.FormsLabel = "Forms Label Binding Changed";
vm.NativeLabel = "Native Label Binding Changed";
vm.NativeLabelColor = Color.Pink;
vm.Age = 10;
BindingContext = ViewModel = vm; ;
};
var boxView = new BoxView { HeightRequest = 50 };
boxView.SetBinding(BoxView.BackgroundColorProperty, "NativeLabelColor");
var label = new Label();
label.SetBinding(Label.TextProperty, "FormsLabel");
var labelAge = new Label();
labelAge.SetBinding(Label.TextProperty, nameof(vm.Age));
Layout.Children.Add(buttonNav);
Layout.Children.Add(label);
Layout.Children.Add(boxView);
Layout.Children.Add(button);
Layout.Children.Add(labelAge);
BindingContext = ViewModel = vm; ;
Content = new ScrollView { Content = Layout };
}
}
[Preserve(AllMembers = true)]
public class NestedNativeViewModel : ViewModelBase
{
string _formsLabel;
public string FormsLabel
{
get { return _formsLabel; }
set { if (_formsLabel == value) return; _formsLabel = value; OnPropertyChanged(); }
}
string _nativeLabel;
public string NativeLabel
{
get { return _nativeLabel; }
set { if (_nativeLabel == value) return; _nativeLabel = value; OnPropertyChanged(); }
}
Color _nativeLabelColor;
public Color NativeLabelColor
{
get { return _nativeLabelColor; }
set { if (_nativeLabelColor == value) return; _nativeLabelColor = value; OnPropertyChanged(); }
}
int _age;
public int Age
{
get { return _age; }
set { if (_age == value) return; _age = value; OnPropertyChanged(); }
}
bool _selected;
public bool Selected
{
get { return _selected; }
set { if (_selected == value) return; _selected = value; OnPropertyChanged(); }
}
}
}
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