MvxActionBarFragmentActivity.cs

using System;
using System.Collections.Generic;
using Android.App;
using Android.Content;
using Cirrious.MvvmCross.Binding.BindingContext;
using Cirrious.MvvmCross.Binding.Droid.BindingContext;
using Cirrious.MvvmCross.Droid.Views;
using Cirrious.MvvmCross.ViewModels;

namespace ECC.Mobile.Droid.Views
{
    public abstract class MvxActionBarFragmentActivity : MvxActionBarEventSource, IMvxAndroidView, IMvxEventSourceFragmentActivity
    {
        private readonly List<WeakReference<Fragment>> _fragments = new List<WeakReference<Fragment>>();

        public object DataContext
        {
            get { return BindingContext.DataContext; }
            set { BindingContext.DataContext = value; }
        }

        public IMvxViewModel ViewModel
        {
            get { return DataContext as IMvxViewModel; }
            set
            {
                DataContext = value;
                OnViewModelSet();
            }
        }

        public IMvxBindingContext BindingContext { get; set; }

        public IList<Fragment> Fragments
        {
            get
            {
                var fragments = new List<Fragment>();
                foreach (var weakReference in _fragments) {
                    Fragment fragment;
                    if (!weakReference.TryGetTarget(out fragment)) continue;
                    if (fragment.IsVisible)
                        fragments.Add(fragment);
                }

                return fragments;
            }
        }

        protected MvxActionBarFragmentActivity()
        {
            BindingContext = new MvxAndroidBindingContext(this, this);
            this.AddEventListeners();
        }

        public void MvxInternalStartActivityForResult(Intent intent, int requestCode)
        {
            StartActivityForResult(intent, requestCode);
        }

        protected virtual void OnViewModelSet()
        {
        }

        public override void SetContentView(int layoutResId)
        {
            var view = this.BindingInflate(layoutResId, null);
            SetContentView(view);
        }

        public override void OnAttachFragment(Fragment fragment)
        {
            base.OnAttachFragment(fragment);
            _fragments.Add(new WeakReference<Fragment>(fragment));
        }
    }

    public abstract class MvxActionBarFragmentActivity<TViewModel> : MvxActionBarFragmentActivity, IMvxAndroidView<TViewModel>
        where TViewModel : class, IMvxViewModel
    {
        public new TViewModel ViewModel
        {
            get { return (TViewModel) base.ViewModel; }
            set { base.ViewModel = value; }
        }
    }
}