public virtual async Task <TResult> Navigate <TParameter, TResult>(IMvxViewModel <TParameter, TResult> viewModel, TParameter param, IMvxBundle presentationBundle = null)
where TParameter : class
where TResult : class
{
RunViewModelLifecycle(viewModel);
var request = new MvxViewModelInstanceRequest(viewModel)
{
PresentationValues = presentationBundle?.SafeGetData()
};
var args = new NavigateEventArgs(viewModel);
OnBeforeNavigate(this, args);
var tcs = new TaskCompletionSource <TResult>();
viewModel.SetClose(tcs);
ViewDispatcher.ShowViewModel(request);
await viewModel.Initialize(param);
OnAfterNavigate(this, args);
try
{
return(await tcs.Task);
}
catch
{
return(default(TResult));
}
}
protected void RunViewModelLifecycle <TParameter>(
IMvxViewModel <TParameter> viewModel,
TParameter param,
IMvxBundle?parameterValues,
IMvxBundle?savedState,
IMvxNavigateEventArgs?navigationArgs)
where TParameter : notnull
{
if (viewModel == null)
{
throw new ArgumentNullException(nameof(viewModel));
}
try
{
CallCustomInitMethods(viewModel, parameterValues);
if (navigationArgs?.Cancel == true)
{
return;
}
if (savedState != null)
{
CallReloadStateMethods(viewModel, savedState);
if (navigationArgs?.Cancel == true)
{
return;
}
}
viewModel.Start();
if (navigationArgs?.Cancel == true)
{
return;
}
viewModel.Prepare();
if (navigationArgs?.Cancel == true)
{
return;
}
viewModel.Prepare(param);
if (navigationArgs?.Cancel == true)
{
return;
}
viewModel.InitializeTask = MvxNotifyTask.Create(() => viewModel.Initialize());
}
catch (Exception exception)
{
throw exception.MvxWrap("Problem running viewModel lifecycle of type {0}", viewModel.GetType().Name);
}
}
public virtual async Task Navigate <TParameter>(IMvxViewModel <TParameter> viewModel, TParameter param, IMvxBundle presentationBundle = null) where TParameter : class
{
RunViewModelLifecycle(viewModel);
var request = new MvxViewModelInstanceRequest(viewModel)
{
PresentationValues = presentationBundle?.SafeGetData()
};
var args = new NavigateEventArgs(viewModel);
OnBeforeNavigate(this, args);
ViewDispatcher.ShowViewModel(request);
await viewModel.Initialize(param);
OnAfterNavigate(this, args);
}
public virtual async Task <TResult> Navigate <TParameter, TResult> (MvxViewModelRequest request, IMvxViewModel viewModel, TParameter param, IMvxBundle presentationBundle = null, CancellationToken cancellationToken = default(CancellationToken)) where TParameter : class where TResult : class
{
var args = new NavigateEventArgs(viewModel);
OnBeforeNavigate(this, args);
var tcs = new TaskCompletionSource <TResult>();
if (viewModel is IMvxViewModel <TParameter, TResult> vmParamResult)
{
vmParamResult.SetClose(tcs, cancellationToken);
await vmParamResult.Initialize(param);
}
else if (viewModel is IMvxViewModelResult <TResult> vmResult)
{
vmResult.SetClose(tcs, cancellationToken);
}
else if (viewModel is IMvxViewModel <TParameter> vmParam)
{
await vmParam.Initialize(param);
}
await viewModel.Initialize();
RunViewModelLifecycle(viewModel, new MvxBundle(request.ParameterValues));
ViewDispatcher.ShowViewModel(request);
OnAfterNavigate(this, args);
if (viewModel is IMvxViewModel <TParameter, TResult> || viewModel is IMvxViewModelResult <TResult> )
{
try
{
return(await tcs.Task);
}
catch (Exception e)
{
return(default(TResult));
}
}
else
{
return(default(TResult));
}
}
protected void RunViewModelLifecycle(IMvxViewModel viewModel, IMvxBundle parameterValues, IMvxBundle savedState)
{
try
{
CallCustomInitMethods(viewModel, parameterValues);
if (savedState != null)
{
CallReloadStateMethods(viewModel, savedState);
}
viewModel.Start();
viewModel.Prepare();
viewModel.InitializeTask = MvxNotifyTask.Create(() => viewModel.Initialize());
}
catch (Exception exception)
{
throw exception.MvxWrap("Problem running viewModel lifecycle of type {0}", viewModel.GetType().Name);
}
}