我无法将 Cheesebarons 水平列表视图更新到新的 v3 MvvmCross。一切似乎都正常工作,除了在我的“BindableHorizontalListView”控件的构造函数中,适配器的 ItemsSource 为空。这很奇怪,因为上下文显示我试图绑定的视图模型属性非常清楚地显示有 3 个项目,并且绑定看起来非常简单。我错过了什么?我希望我已经包含了足够多的代码。我还尝试通过“OnViewModelSet”事件上的流利绑定来绑定它,结果相同。
出现警告
[MvxBind] 24.87 Unable to bind: source property source not found Cirrious.MvvmCross.Binding.Parse.PropertyPath.PropertyTokens.MvxPropertyNamePropertyToken on DeviceViewModel
AXML
<BindableHorizontalListView
android:id="@+id/listView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
local:MvxBind="ItemsSource DevicesList; ItemClick ItemSelected"
local:MvxItemTemplate="@layout/devices_horizontal_list_item" />
BindableHorizontalListView 控件
using System.Collections;
using System.Windows.Input;
using Android.Content;
using Android.Util;
using Cirrious.MvvmCross.Binding.Attributes;
using Cirrious.MvvmCross.Binding.Droid.Views;
namespace Project.Droid.Controls
{
public class BindableHorizontalListView
: HorizontalListView //Which inherits from AdapterView<BaseAdapter>
{
public BindableHorizontalListView(Context context, IAttributeSet attrs)
: this(context, attrs, new MvxAdapter(context))
{
}
public BindableHorizontalListView(Context context, IAttributeSet attrs, MvxAdapter adapter)
: base(context, attrs)
{
InitView ();
var itemTemplateId = MvxAttributeHelpers.ReadListItemTemplateId (context, attrs);
adapter.ItemTemplateId = itemTemplateId;
Adapter = adapter;
SetupItemClickListener();
}
public new MvxAdapter Adapter
{
get { return base.Adapter as MvxAdapter; }
set
{
var existing = Adapter;
if (existing == value)
return;
if (existing != null && value != null)
{
value.ItemsSource = existing.ItemsSource;
value.ItemTemplateId = existing.ItemTemplateId;
}
base.Adapter = value;
}
}
[MvxSetToNullAfterBinding]
public IEnumerable ItemsSource
{
get { return Adapter.ItemsSource; }
set { Adapter.ItemsSource = value; this.Reset (); }
}
public int ItemTemplateId
{
get { return Adapter.ItemTemplateId; }
set { Adapter.ItemTemplateId = value; }
}
public new ICommand ItemClick { get; set; }
private void SetupItemClickListener()
{
base.ItemClick += (sender, args) =>
{
if (null == ItemClick)
return;
var item = Adapter.GetItem(args.Position) as Java.Lang.Object;
if (item == null)
return;
if (item == null)
return;
if (!ItemClick.CanExecute(item))
return;
ItemClick.Execute(item);
};
}
}
}
看法
[Activity (Label = "Device", ScreenOrientation = ScreenOrientation.Portrait)]
public class DeviceView : MvxActivity
{
protected override void OnCreate (Bundle bundle)
{
base.OnCreate (bundle);
SetContentView(Resource.Layout.device);
}
}
ViewModel 上的属性
private Services.Device[] _devicesList;
public Services.Device[] DevicesList {
get {
return _devicesList;
}
set {
_devicesList = value;
RaisePropertyChanged(() => DevicesList);
}
}
如果 XAM STUDIO 中只有 PCL 支持,我会介入,看看其他控件是如何做到的!!!!