awesome-uiwidgets/AwesomeUIWidgets/Assets/Scripts/Conditional/conditional.cs

using System;
using System.Collections.Generic;
using System.Linq;
using ChatComponents;
using uiwidgets;
using Unity.UIWidgets.animation;
using Unity.UIWidgets.foundation;
using Unity.UIWidgets.material;
using Unity.UIWidgets.painting;
using Unity.UIWidgets.rendering;
using Unity.UIWidgets.ui;
using Unity.UIWidgets.widgets;
using Image = Unity.UIWidgets.widgets.Image;

namespace UIWidgetsSample
{
    public abstract class Conditional
    {
        /// Creates a new platform appropriate conditional.
        ///
        /// Creates an `IOConditional` if `dart:io` is available and a `BrowserConditional` if
        /// `dart:html` is available, otherwise it will throw an unsupported error.
        public Conditional() => createConditional();

        /// Returns an appropriate platform ImageProvider for specified URI
        public abstract ImageProvider getProvider(string uri);

        public abstract BaseConditional createConditional();
    }

    public abstract class BaseConditional : Conditional
    {
        public override BaseConditional createConditional() => new BrowserConditional();
        /*BaseConditional createConditional() =>
            throw UnsupportedError('Cannot create a conditional');*/
    }




    /// A conditional for browser
    class BrowserConditional : BaseConditional
    {
        /// Returns [NetworkImage] if URI starts with http
        /// otherwise returns transparent image
        public override ImageProvider getProvider(string uri)
        {
            if ( uri.StartsWith("http") || uri.StartsWith("blob")) {
                return new NetworkImage(uri);
            } 
            else {
                return new MemoryImage(ConditionalUtils.kTransparentImage);
            }
        }
    }

    public static class ConditionalUtils
    {
        /// Transparent image data
        public static byte[] kTransparentImage = nums.SelectMany(BitConverter.GetBytes).ToArray();

        public static List<Int32> nums = new List<Int32>()
        {
            0x89,
            0x50,
            0x4E,
            0x47,
            0x0D,
            0x0A,
            0x1A,
            0x0A,
            0x00,
            0x00,
            0x00,
            0x0D,
            0x49,
            0x48,
            0x44,
            0x52,
            0x00,
            0x00,
            0x00,
            0x01,
            0x00,
            0x00,
            0x00,
            0x01,
            0x08,
            0x06,
            0x00,
            0x00,
            0x00,
            0x1F,
            0x15,
            0xC4,
            0x89,
            0x00,
            0x00,
            0x00,
            0x0A,
            0x49,
            0x44,
            0x41,
            0x54,
            0x78,
            0x9C,
            0x63,
            0x00,
            0x01,
            0x00,
            0x00,
            0x05,
            0x00,
            0x01,
            0x0D,
            0x0A,
            0x2D,
            0xB4,
            0x00,
            0x00,
            0x00,
            0x00,
            0x49,
            0x45,
            0x4E,
            0x44,
            0xAE,
        };


    
    }

   
}