WildGums/Orchestra

Orchestra is a composable shell built on top of Catel

venom_aa

@venomAA

and _view is the type of the view

ups..contenedorVistas is the ContentPresenter :P

venom_aa

@venomAA

@advapiIT looks like the GC.Collect isnt doing its job of forcing the unloading of the vm correctly all the time

so i have to manually close the last vm shown on the ContentPresenter in the MainViewModel. Hope the code gives you a hint to make your own :)

venom_aa

@venomAA

@advapiIT forget about what i said about the bug.. the above code works perfectly fine and the automatic close on the unload its working perfectly

advapiIT

@advapiIT

Excuse me , does Orchestra implement a close service that asks before closing or have I to implmeent on my own?

Geert van Horrik

@GeertvanHorrik

hwe do have one, but not sure whether it's in orchestra or our private libs

I'm afraid it's internal

advapiIT

@advapiIT

ok..

no problem,thanks

I think I have to modify the ShellService in order to intercept it

Geert van Horrik

@GeertvanHorrik

just search for the vm of the main window

then subscirbe to the close event, I think you can intercept it

advapiIT

@advapiIT

I've some reminiscence of such a discussion with you almost 2 years ago

I try, thanks

advapiIT

@advapiIT

just to know, since I've checek but MainView is just an usercontrol, is a simple way I can treieve the shellview view from IApplicationStartupService, so I can attach a behavior

Geert van Horrik

@GeertvanHorrik

MainView is, but it's parent is a window ;-)

that's because the window depends on the shell implementation (mahapps / fluent.ribbon / whatever)

advapiIT

@advapiIT

uhm

true

thx for the hint

Geert van Horrik

@GeertvanHorrik

I thikn Orchestra even has a GetParentWindow extension method

advapiIT

@advapiIT

super!

Geert van Horrik

@GeertvanHorrik

you are lucky

CloseApplicationWatcherBase

just implement a watcher deriving from that one

and register it in the servicelocator with RegisterAndInstantiate<MyWatcher>()

you should ask your company to sponsor us ;-)

advapiIT

@advapiIT

yup I'll do

Geert van Horrik

@GeertvanHorrik

on open collective you'll even get an invoice

advapiIT

@advapiIT

let me finish it and I'll contribute

I promise

Geert van Horrik

@GeertvanHorrik

that's the point, it should not be you, it should be your company / manager / whatever

anyway, this watcher is very nice

you can handle it there

so in our internal libs, we have created a watcher that intercepts that closing, and exposes that via a service, so we can prevent closing from basically everywhere

advapiIT

@advapiIT

TypeNotRegisteredException: The specified type 'Orchestra.CloseApplicationWatcherBase, Orchestra.Core, Version=5.2.6.0, Culture=neutral, PublicKeyToken=null' is not registered or could not be constructed. Please register type before using it. The type 'Orchestra.CloseApplicationWatcherBase, Orchestra.Core, Version=5.2.6.0, Culture=neutral, PublicKeyToken=null' is not registered

Geert van Horrik

@GeertvanHorrik

public abstract class CloseApplicationWatcherBase

but.....

advapiIT

@advapiIT

Ah I've to derive from it

Geert van Horrik

@GeertvanHorrik

    public class ApplicationClosingService : CloseApplicationWatcherBase, IApplicationClosingService
    {
        public bool IsClosing { get; private set; }

        public event AsyncEventHandler<EventArgs> ApplicationClosingAsync;
        public event EventHandler<EventArgs> ApplicationClosingCanceled;

        protected override async Task<bool> ClosingAsync()
        {
            IsClosing = true;

            await ApplicationClosingAsync.SafeInvokeAsync(this, EventArgs.Empty);

            return await base.ClosingAsync();
        }

        protected override void ClosingCanceled()
        {
            IsClosing = false;

            ApplicationClosingCanceled?.Invoke(this, EventArgs.Empty);

            base.ClosingCanceled();
        }
    }

this is our internal implementation, then you can simply subscribe to IApplicationClosingService::ApplicationClosing and cancel it from there

advapiIT

@advapiIT

excuse me again, but when I subscribe to ApplicationClosing, how can I cancel? the EventArgs

has no cancel prop

Geert van Horrik

@GeertvanHorrik

hmmm, good question

you can fix your own, if the eventargs of ApplicationClosingAsync has an e.Cancel

you could cancel

since it has a reutnr value

advapiIT

@advapiIT

you're right

advapiIT

@advapiIT

ok, this seems to work
in mainviewmodel
```private async Task ApplicationClosingService_ApplicationClosingAsync(object sender, CancelEventArgs e)
{
var response = await messageService.ShowAsync("Sei sicuro di voler chiudere l'applicazione?",
"Chiusura applicazione", MessageButton.YesNo, MessageImage.Question);
if (response == MessageResult.No)
{
e.Cancel = true;
}
}

in the closeService

protected override async Task<bool> ClosingAsync()
{
IsClosing = true;

        var eventArgs = new CancelEventArgs();
        await ApplicationClosingAsync.SafeInvokeAsync(this, eventArgs);

        if (!eventArgs.Cancel)
            return await base.ClosingAsync();
        return false;
    }

```

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