/// <summary>
/// Creates an <see cref="IObservableCommand{T}"/> available via data binding.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="viewModel"></param>
/// <param name="name"></param>
/// <returns></returns>
public static IObservableCommand <T> CreateObservableCommand <T>(this BaseViewModel viewModel, string name)
{
var observableValue = new ObservableValue <IObservableCommand <T> >(new ObservableCommand <T>());
viewModel.AddProperty <IObservableCommand <T> >(name, observableValue);
return(observableValue.Latest);
}
/// <summary>
/// Creates an <see cref="ObservableValue{T}"/> available via data binding.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="viewModel"></param>
/// <param name="name"></param>
/// <param name="initialValue"></param>
/// <returns></returns>
public static ObservableValue <T> CreateProperty <T>(
this BaseViewModel viewModel,
string name,
T initialValue = default(T))
{
var observableValue = new ObservableValue <T>(initialValue);
viewModel.AddProperty <T>(name, observableValue);
return(observableValue);
}
/// <summary>
/// Creates an <see cref="IObservableCommand{T}"/> available via data binding, with support for <see cref="System.Windows.Input.ICommand.CanExecute"/>
/// via an <see cref="IObservable{Unit}"/> that triggers a call to a <see cref="Func{T, Boolean}"/>.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="viewModel"></param>
/// <param name="name"></param>
/// <param name="canExecuteFunc"></param>
/// <param name="canExecuteChangedObservable"></param>
/// <returns></returns>
public static IObservableCommand <T> CreateObservableCommand <T>(
this BaseViewModel viewModel,
string name,
Func <T, bool> canExecuteFunc,
IObservable <Unit> canExecuteChangedObservable = null)
{
var observableValue = new ObservableValue <IObservableCommand <T> >(new ObservableCommand <T>(canExecuteFunc, canExecuteChangedObservable));
viewModel.AddProperty <IObservableCommand <T> >(name, observableValue);
return(observableValue.Latest);
}
/// <summary>
/// Creates an <see cref="ObservableValue{T}"/> available via data binding, affected by a source observable, with late materialization
/// of the observable logic.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="viewModel"></param>
/// <param name="name"></param>
/// <param name="inputObservableSelector"></param>
/// <param name="initialValue"></param>
/// <returns></returns>
public static ObservableValue <T> CreateProperty <T>(
this BaseViewModel viewModel,
string name,
Func <IObservable <T>, IObservable <T> > inputObservableSelector,
T initialValue = default(T))
{
var observableValue = new ObservableValue <T>(initialValue);
viewModel.AddProperty <T>(name, observableValue);
viewModel.AddTrigger(ViewModelState.Loaded, () => observableValue.AddInput(inputObservableSelector));
return(observableValue);
}
/// <summary>
/// Creates an <see cref="IObservableCommand{T}"/> available via data binding, with support for <see cref="System.Windows.Input.ICommand.CanExecute"/>
/// via an <see cref="IObservable{Boolean}"/>. You can optionally expose that observable via a "Can" + name property as well.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="viewModel"></param>
/// <param name="name"></param>
/// <param name="canExecuteObservable"></param>
/// <param name="includeCanProperty"></param>
/// <returns></returns>
public static IObservableCommand <T> CreateObservableCommand <T>(
this BaseViewModel viewModel,
string name,
IObservable <bool> canExecuteObservable,
bool includeCanProperty = false)
{
var observableValue = new ObservableValue <IObservableCommand <T> >(new ObservableCommand <T>(canExecuteObservable));
viewModel.AddProperty <IObservableCommand <T> >(name, observableValue);
if (includeCanProperty)
{
viewModel.CreateProperty($"Can{name}", () => canExecuteObservable, true);
}
return(observableValue.Latest);
}
/// <summary>
/// Creates a command accepting a parameter, available via data binding, executing the provided async function,
/// with support for <see cref="System.Windows.Input.ICommand.CanExecute"/> via an <see cref="IObservable{Boolean}"/>.
/// </summary>
/// <typeparam name="TParameter"></typeparam>
/// <param name="viewModel"></param>
/// <param name="name"></param>
/// <param name="asyncExecute"></param>
/// <param name="canExecuteObservable"></param>
public static void CreateCommand <TParameter>(this BaseViewModel viewModel, string name, Func <CancellationToken, TParameter, Task> asyncExecute, IObservable <bool> canExecuteObservable)
{
var observableValue = new ObservableValue <IAsyncCommand>(new AsyncCommand <TParameter>(asyncExecute, canExecuteObservable));
viewModel.AddProperty <IAsyncCommand>(name, observableValue);
}
/// <summary>
/// Creates a command available via data binding, executing the provided async function.
/// </summary>
/// <param name="viewModel"></param>
/// <param name="name"></param>
/// <param name="asyncExecute"></param>
public static void CreateCommand(this BaseViewModel viewModel, string name, Func <CancellationToken, Task> asyncExecute)
{
var observableValue = new ObservableValue <IAsyncCommand>(new AsyncCommand(asyncExecute));
viewModel.AddProperty <IAsyncCommand>(name, observableValue);
}
