UrhoSharp.Forms Urho-Content not expanding to Fullscreen inside the UrhoSurface

[Meffi29a]

Hello, i start working on UrhoSharp 2017, had a lot of trouble to get it work as i need, but struggle since days on one little thing. And i start to run in circles by trying to find the wrong place in my code! I tried a lot of setup on iOS, for fixing an strange behavior, only on iOS. To my Code: I build an .Forms App with a Surface. Insert my Urho-Stuff (For this example the example "public class Charts : Application" = from the tutorial.

And when i start on:

• Microsoft Surface, its Fine. -Android simulator, its Fine -Android Hardware, the same. BUT: -iOS-Simulator, only 1/3 of the Display is used -iOS Debug on my phone, only 1/3 of the Display is used

is there an issue with the 3xDensity in iOS? On Android-Tabelet with 1.5 Density its working

Xamarin.Forms : 3.1.0.697729 UrhoSharp.Forms: 1.8.93 VisualStudio for Mac 7.6.3 I included Xamarin.Essentials 0.10.0 too, but not used for this example.

I think, all the newest version

My Code:

AppDeligate: as out of the Box global::Xamarin.Forms.Forms.Init(); LoadApplication(new App()); return base.FinishedLaunching(app, options);

MainPage in Core-Code: (//-Stuff dose not change anything)

public partial class MainPage : ContentPage {

public UrhoSurface MyUrhoSurface { get; set;} public MainPage() {

        MyUrhoSurface = new UrhoSurface
        {
            BackgroundColor = Xamarin.Forms.Color.BlanchedAlmond,
            //HorizontalOptions = LayoutOptions.FillAndExpand,
            //VerticalOptions = LayoutOptions.FillAndExpand
        };

        MyUrhoSurface.Show<Views.Charts>(new ApplicationOptions(null)
        {
            //Orientation = ApplicationOptions.OrientationType.LandscapeAndPortrait,
        });

        MyUrhoSurface.HorizontalOptions = LayoutOptions.FillAndExpand;
        MyUrhoSurface.VerticalOptions = LayoutOptions.FillAndExpand;
        var stack = new StackLayout();
        stack.Children.Add(MyUrhoSurface);
        Content = stack;
        InitializeComponent();

    }

MainPage.Xaml: only the <...>

As you see, the result is not fine, but only on iOS.

Maybe one of You know what to do. Someone has the same problems? Maybe its a issue, not done by myself, but so it could be known and there could be a workaround. But i did not find a comment belonging to this.

[YuriyDurov]

I have the same issue here.

[Meffi29a]

Nice to know that i`m not the only one. So maybe it is a reason for the Team to have a short view on this.

I found a workaround, maybe You can use it too. As You could know, the density on IOS is 3 (on the new Retinas), so i tried to enlarge the Content from the Surface by 3 by do a NEGATIVE margin... It worked exact! so i decided to do it generic to all iOS. I used DeviceDisplay.ScreenMetrics (Xamarin.Essentials who is in beta.) to scale the MyUrhoSurface.Margin to a negative Value who is 1/Density from the current Display. But this is not working when your App change landscape to portrait and then Back. then there is an offset on topp-padding after changing orientation. Im Tired to find a solution for this, so i blocked portrait on iOS for now. Maybe someone find the ?bug? in the source, ore find a better workaround as i did. But You should calculate with your surfaces current with and heigh, as you have no Fullscreen at your shown app.

#####################################################################

public partial class MainPage : ContentPage
    {
        public static UrhoSurface MyUrhoSurface;
        public MainPage()
        {

            MyUrhoSurface = new UrhoSurface
                {
                    BackgroundColor = Xamarin.Forms.Color.BlanchedAlmond,
                    HorizontalOptions = LayoutOptions.FillAndExpand,
                    VerticalOptions = LayoutOptions.FillAndExpand
                };

                MyUrhoSurface.Show<Views.UrhoObjects.MySurfaceContentPage>(new ApplicationOptions("Data")
                {
                    Orientation = ApplicationOptions.OrientationType.LandscapeAndPortrait,

                });

                MyUrhoSurface.HorizontalOptions = LayoutOptions.FillAndExpand;
                MyUrhoSurface.VerticalOptions = LayoutOptions.FillAndExpand;
                var stack = new StackLayout();
                stack.Children.Add(MyUrhoSurface);

             Content = stack;
            Content.HorizontalOptions = LayoutOptions.FillAndExpand;
            Content.VerticalOptions = LayoutOptions.FillAndExpand;

            SizeChanged += OnSizeChanged;
            InitializeComponent();

        }
        void OnSizeChanged(object sender, EventArgs e)
        {
            if (!Device.RuntimePlatform.Equals(Device.iOS)) return;
            var top = 0-(DeviceDisplay.ScreenMetrics.Height / DeviceDisplay.ScreenMetrics.Density);
            var bottom = top;
            var left = 0-(DeviceDisplay.ScreenMetrics.Width / DeviceDisplay.ScreenMetrics.Density);
            var right = left;
            Debug.WriteLine($"Top: {top} Bottom: {bottom} Left: {left} Right: {right}");
            MyUrhoSurface.Margin = new Thickness(left, top, right, bottom);
        }

}

####################################################

[YuriyDurov]

I seem to have found a solution that works for me.

1. Remove SizeChanged += OnSizeChanged;

2. Put

MyUrhoSurface.Show<Views.UrhoObjects.MySurfaceContentPage>(new ApplicationOptions("Data") { Orientation = ApplicationOptions.OrientationType.LandscapeAndPortrait, });

Into a function, let's say it will be CastUrho(); inside of your public partial class MainPage : ContentPage

3. Don't call this function in Public MainPage() as you do now. But use it like that:

protected override void OnAppearing() { CastUrho(); } inside of your public partial class MainPage : ContentPage

Try this method, I hope it helps.

[Meffi29a]

Thanks DeadEndKing!

Is working on iOS nearly 100%

When the orientation switching from portrait to landscape and back its still buggy. The height is set false, and so i have to add:

protected override void OnSizeAllocated(double width, double height)
        {
            base.OnSizeAllocated(width, height);
            //Debug.WriteLine($"width: {width} height: {height}");
            if (!Device.RuntimePlatform.Equals(Device.iOS) && DeviceDisplay.ScreenMetrics.Orientation != ScreenOrientation.Landscape) return;
            MyUrhoSurface.LayoutTo(new Rectangle(new Point(0, 0), new Size(width, height)));
        }

At least, your solution works great. I have to think about the reasons, but think it should not be as it works now. Xamarin.Forms uses sometimes the Resolution of the Device, but when uncomment the //Debug, it's to see, that sometimes the resolution / density is used instead.

Reason to highlight as bug?