Created
October 21, 2015 07:32
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Base view model for Xamarin bindings. Contains helper methods for setting a field and notify the binding.
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| using Foundation; | |
| using System.Runtime.CompilerServices; | |
| using System; | |
| namespace ViewModels | |
| { | |
| public class BaseViewModel : NSObject | |
| { | |
| public event EventHandler PropertyChanged = delegate{}; | |
| protected void SetField<T>(ref T field, T value, [CallerMemberName] string propertyName = null) | |
| { | |
| WillChangeValue(propertyName); | |
| field = value; | |
| DidChangeValue(propertyName); | |
| PropertyChanged(this, null); | |
| } | |
| protected void SetField<T>(ref T field, T value, string propertyName, params string[] additionalProperties) | |
| { | |
| foreach (var prop in additionalProperties) | |
| { | |
| WillChangeValue(prop); | |
| } | |
| WillChangeValue(propertyName); | |
| field = value; | |
| DidChangeValue(propertyName); | |
| foreach (var prop in additionalProperties) | |
| { | |
| DidChangeValue(prop); | |
| } | |
| PropertyChanged(this, null); | |
| } | |
| } | |
| public class DemoViewModel : BaseViewModel | |
| { | |
| private string _str; | |
| [Export("Str")] | |
| public string Str | |
| { | |
| get { return _str; } | |
| set { SetField(ref _str, value); } | |
| } | |
| private string _strWithOtherBindings; | |
| [Export("StrWithOtherBindings")] | |
| public string StrWithOtherBindings | |
| { | |
| get { return _strWithOtherBindings; } | |
| set { SetField(ref _strWithOtherBindings, value, "StrWithOtherBindings", "OtherBinding"); } | |
| } | |
| } | |
| } |
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