public async Task DeactivateAsync(NavigationType navigationType, IDeactivationParameters parameters)
{
if (navigationType == NavigationType.Backward)
{
this.Items.Clear();
}
}
public async Task <bool> CanDeactivateAsync(NavigationType navigationType, IDeactivationParameters parameters)
{
// Do NOT normally do this in you MMVM application, using dialogs and other View-related things breaks MVVM
// This is here only for simplicity
var dlg = new MessageDialog(Item.Content + " is trying to deactivate, allow?");
dlg.Commands.Add(new UICommand("Yes"));
dlg.Commands.Add(new UICommand("No"));
return((await dlg.ShowAsync()).Label == "Yes");
}
public async Task DeactivateAsync(NavigationType navigationType, IDeactivationParameters parameters)
{
this.IsWorking = true;
// simulate sync with cloud
await Task.Delay(3000);
this.IsWorking = false;
this.Item = null;
}
public static async Task <bool> CanDeactivateViewModelAsync(object target, NavigationType navigationType, IDeactivationParameters parameters)
{
var query = target as IDeactivateQuery;
if (query != null)
{
if (!await query.CanDeactivateAsync(navigationType, parameters))
{
return(false);
}
}
return(true);
}
public static async Task DeactivateViewModelAsync(object target, NavigationType navigationType, IDeactivationParameters parameters)
{
var deactivate = target as IDeactivate;
if (deactivate != null)
{
await deactivate.DeactivateAsync(navigationType, parameters);
}
}