there isn't an equivalent for wpf's status bar yet right?
i'm getting
OmniXaml.LoadException: Error loading XAML: OmniXaml.ParseException: The type "{:DynamicResourceExtension} cannot be found" trying to use DynamicResource like this:
<ScrollViewer MinWidth="190" Background="{DynamicResource ThemeAccentBrush}" DockPanel.Dock="Left">
what avalonia version are you on?
i'd sugest using one of the nightlies..
I'm using 0.5.1 "stable"-ish
from the myget or nuget?
nuget
ah, perhaps DynamicResource was added since the stable release
ah, perhaps DynamicResource was added since the stable release
i'm trying the nightlies now
a lot ahs happened sionce latest stable release
most nightlies are quite stable as well though
oh ok great
it works, thank you
i guess i'll just stick to the nightlies
if you're interested, i got some .target files which can help you switfh you project voer to custom-built avalonia (ie, from sources) easily
I don't think i'll need it for this project, but sure, for future reference
where I can I see an example of showing data in a grid?
OK, scratch that. What I really need to do is create a DataTemplate through code
The best WPF-flavoured reference I've found so far is https://www.codeproject.com/Articles/444371/Creating-WPF-Data-Templates-in-Code-The-Right-Way but I can't figure out how to do the equivalent in Avalonia
OK, I got it:
var template = (DataTemplate)new AvaloniaXamlLoader().Load(xaml);
somewhat easier than that WPF example :-)
@adamralph you can also create data templates in code without XAML if you want, see here for a simple example https://github.com/AvaloniaUI/Avalonia/blob/c1b93d4da2006b73ccc451cea95611a252fb5888/tests/Avalonia.Controls.UnitTests/Presenters/ItemsPresenterTests_Virtualization.cs#L302
you can then use bindings in the object initializer as described here: http://avaloniaui.net/spec/binding-from-code.html
an example might be:
new FuncDataTemplate<MyViewModel>(x => new TextBlock
{
[!TextBlock.TextProperty] = new Binding("Foo") // Binds to MyViewModel.Foo
});
using ReactiveCommand.CreateFromTask
@grokys awesome, thanks. That's even better
i'm having
{System.InvalidOperationException: Call from invalid thread
My view's datacontext is a viewmodel like this:
loginCommand = ReactiveCommand.CreateFromTask(login);
private async Task login() {
// TODO: stuff and things
await Task.Delay(1000);
}And the command is bound to a Button's command;
but when the button is pressed, I get this exception:
{System.InvalidOperationException: Call from invalid thread
at Avalonia.Threading.Dispatcher.VerifyAccess()
at Avalonia.AvaloniaObject.VerifyAccess()
at Avalonia.AvaloniaObject.GetValue(AvaloniaProperty property)
at Avalonia.AvaloniaObject.GetValue[T](AvaloniaProperty`1 property)
at Avalonia.Controls.Button.get_CommandParameter()
at Avalonia.Controls.Button.CanExecuteChanged(Object sender, EventArgs e)
at ReactiveUI.ReactiveCommand.OnCanExecuteChanged()
at ReactiveUI.ReactiveCommand`2.<.ctor>b__9_5(Boolean _)
at System.Reactive.AnonymousSafeObserver`1.OnNext(T value)
at System.Reactive.Linq.ObservableImpl.RefCount`1._.OnNext(TSource value)
at System.Reactive.Subjects.FastImmediateObserver`1.EnsureActive(Int32 count)
at System.Reactive.Subjects.FastImmediateObserver`1.EnsureActive()
at System.Reactive.Subjects.ReplaySubject`1.ReplayBase.OnNext(T value)
at System.Reactive.Subjects.ReplaySubject`1.OnNext(T value)
at System.Reactive.Linq.ObservableImpl.AsObservable`1._.OnNext(TSource value)
at System.Reactive.Linq.ObservableImpl.DistinctUntilChanged`2._.OnNext(TSource value)
at System.Reactive.Linq.ObservableImpl.CombineLatest`3._.S.OnNext(TSecond value)
at System.Reactive.Linq.ObservableImpl.RefCount`1._.OnNext(TSource value)
at System.Reactive.Subjects.FastImmediateObserver`1.EnsureActive(Int32 count)
at System.Reactive.Subjects.FastImmediateObserver`1.EnsureActive()
at System.Reactive.Subjects.ReplaySubject`1.ReplayBase.OnNext(T value)
at System.Reactive.Subjects.ReplaySubject`1.OnNext(T value)
at System.Reactive.Linq.ObservableImpl.AsObservable`1._.OnNext(TSource value)
at System.Reactive.Linq.ObservableImpl.DistinctUntilChanged`2._.OnNext(TSource value)
at System.Reactive.Linq.ObservableImpl.Concat`1._.OnNext(TSource value)
at System.Reactive.Linq.ObservableImpl.Select`2._.OnNext(TSource value)
at System.Reactive.SafeObserver`1.OnNext(TSource value)
at System.Reactive.ScheduledObserver`1.Dispatch(ICancelable cancel)
at System.Reactive.Concurrency.Scheduler.<>c.<ScheduleLongRunning>b__72_0(Action`1 a, ICancelable c)
at System.Reactive.Concurrency.DefaultScheduler.LongRunning.<>c__DisplayClass1_0`1.<ScheduleLongRunning>b__0(Object arg)
at System.Reactive.Concurrency.ConcurrencyAbstractionLayerImpl.<>c__DisplayClass7_0.<StartThread>b__0()
at System.Threading.Thread.ThreadMain_ThreadStart()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()}
you're trying to access controls from a background thread, which isn't allowed
where am I doing that?
hard to say without seeing the code, but if you debug your code in VS and look in the Threads window, you should see that you're not on the main thread
System.Threading.ThreadHelper.ThreadStart()
but the method is actually empty
all it does is call the task delay
there's no access of controls as far as I know
what thread are you in at the start of the method?
the CreateFromTask is called in the constructor
ah it looks like the command's
CanExecute state is being changed from a b/g thread
is there anything I can do about that?
I don't think i'm specifying a CanExecute
hmm not sure tbh - this is all ReactiveUI code, not avalonia
does Avalonia provide any
ICommand implementations?
i wonder if
CreateFromTask just doesn't work with avalonia?
no, i recommend reactiveui, but it looks like there's something wrong there
let me debug and see if i can work out what's going on
cool
thanks
Are you using the nightly build?
yes
I am using the latest package from the avalonia ci nuget feed
hmm yeah i'm seeing the same
so is the issue part of reactiveui?
ReactiveCommand.CreateFromTask(Login, outputScheduler: AvaloniaScheduler.Instance) looks like it might fix it
but i don't understand why it's not working by default...
i'll try that for now
there seems to be a bug there too where the button looks like it's disabled after the command has been run, it only shows the enabled state again after you move your mouse over it
yes
i just noticed that too
i'm trying with a CanExecute now
yeah, something similar for that too
when canexecute is false, the button still appears to be enabled until you mouse over it
but it doesn't kind of "fade out" to the disabled color, you just can't click it
i can make a recording of the behavior if you want
oh, the button appears to switch to the disabled color if you attempt to click it
ahhh ok, i know why the original problem was happening. you need to call
UseReactiveUI on your AppBuilder to configure rxui
public static AppBuilder BuildAvaloniaApp()
=> AppBuilder.Configure<App>()
.LogToDebug()
.UsePlatformDetect()
.UseReactiveUI();
oops
here is a recording of the button state issue
the button is supposed to be disabled when the username field is empty
yeah it looks like changing the button enabled state doesn't invalidate the visual
I added
UseReactiveUI, that solves the threading problem, but not this one
can I manually invalidate it?
yeah, i can fix it now
sounds good, thanks
are the nuget packages automatically published after every CI build?
only when a PR is merged to master
oh ok
hmm, looks like the button problem isn't what i thought it would be
ahh, ok i think i see it, working on a fix now
what was the problem?
it was introduced by this AvaloniaUI/Avalonia#1306
because render layers aren't always being created for transparent controls, we need to make sure that all child controls are re-rendered
i think ;)