本地列表：MvxBind 绑定器

Question

我找不到所有可用的活页夹类型的列表，最近一位同事发现了关于 local:MvxBind="Visibility Property" 的信息，这对我们的代码有很大帮助。我相信 MvvMCross 有很多我们还不知道的隐藏宝石。信息在某处可用吗？

我们知道的粘合剂：

• local:MvxBind="文本属性"
• local:MvxBind="ItemsSource 属性；SelectedItem 属性"
• local:MvxBind="单击 ICommandProperty"
• local:MvxBind="ItemsSource 属性；ItemClick ICommandProperty"
• local:MvxBind="可见性属性"

谢谢！

Answer 1

自动属性绑定

MvvmCross 绑定到本机视图上的 C# 属性 - 因此 Xamarin.Android 公开的任何公共 C# get/set 属性都可以单向绑定。

此外，如果属性Foo伴随着签名事件public event EventHandler FooChanged，那么MvvmCross可以双向绑定到它。

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自动事件绑定

MvvmCross 还绑定到任何由本机视图公开的 public C# events - 只要它们具有 EventHandler 签名并且没有 EventHandler<SomeSpecialArgs>

这些可以自动绑定到 ICommand 调用者（操作会自动绑定到 Execute 处理程序，但 nothing 会自动绑定到 CanExecute）。

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自定义绑定

除了这些简单的属性之外，MvvmCross 还具有“自定义绑定”功能。

MvvmCross 默认提供的“自定义绑定”列表位于 AndroidBindingBuilder 中的FillTargetBindings - https://github.com/MvvmCross/MvvmCross/blob/v3/Cirrious/Cirrious.MvvmCross.Binding.Droid/MvxAndroidBindingBuilder.cs#L79

        registry.RegisterCustomBindingFactory<TextView>("Text",
                                                        textView => new MvxTextViewTextTargetBinding(textView));
        registry.RegisterPropertyInfoBindingFactory((typeof(MvxAutoCompleteTextViewPartialTextTargetBinding)),
                                                typeof(AutoCompleteTextView), "PartialText");
        registry.RegisterPropertyInfoBindingFactory(
                                                typeof(MvxAutoCompleteTextViewSelectedObjectTargetBinding),
                                                typeof(AutoCompleteTextView),
                                                "SelectedObject");
        registry.RegisterPropertyInfoBindingFactory(typeof(MvxCompoundButtonCheckedTargetBinding),
                                                typeof(CompoundButton), "Checked");
        registry.RegisterPropertyInfoBindingFactory(typeof(MvxSeekBarProgressTargetBinging), typeof(SeekBar),
                                                "Progress");
        registry.RegisterCustomBindingFactory<View>("Visible",
                                                        view => new MvxViewVisibleBinding(view));
        registry.RegisterCustomBindingFactory<View>("Hidden",
                                                        view => new MvxViewHiddenBinding(view));
        registry.RegisterCustomBindingFactory<ImageView>("Bitmap",
                                                        imageView => new MvxImageViewBitmapTargetBinding(imageView));
        registry.RegisterCustomBindingFactory<ImageView>("DrawableId",
                                                        imageView => new MvxImageViewDrawableTargetBinding(imageView));
        registry.RegisterCustomBindingFactory<ImageView>("DrawableName",
                                                        imageView => new MvxImageViewDrawableNameTargetBinding(imageView));
        registry.RegisterCustomBindingFactory<ImageView>("AssetImagePath",
                                                         imageView => new MvxImageViewImageTargetBinding(imageView));
        registry.RegisterCustomBindingFactory<MvxSpinner>("SelectedItem",
                                                                         spinner =>
                                                                         new MvxSpinnerSelectedItemBinding(
                                                                             spinner));
        registry.RegisterCustomBindingFactory<AdapterView>("SelectedItemPosition",
                                                                          adapterView =>
                                                                          new MvxAdapterViewSelectedItemPositionTargetBinding
                                                                              (adapterView));
        registry.RegisterCustomBindingFactory<MvxListView>("SelectedItem",
                                                                          adapterView =>
                                                                          new MvxListViewSelectedItemTargetBinding
                                                                              (adapterView));
        registry.RegisterCustomBindingFactory<RatingBar>("Rating",
                                                        ratingBar => new MvxRatingBarRatingTargetBinding(ratingBar));
        registry.RegisterCustomBindingFactory<View>("LongClick",
                                                        view =>
                                                        new MvxViewLongClickBinding(view));
        registry.RegisterCustomBindingFactory<MvxRadioGroup>("SelectedItem",
            radioGroup => new MvxRadioGroupSelectedItemBinding(radioGroup));

一些插件（尤其是Color）也添加了自己的绑定。

有关添加您自己的自定义绑定的信息，请参阅http://slodge.blogspot.co.uk/2013/06/n28-custom-bindings-n1-days-of-mvvmcross.html

关于 MvvmCross 自定义控件、动画和地图的 N+1 个主题也值得关注 - 它们提供了自定义绑定的替代机制。

有关 MvvmCross 绑定的更多信息，请参阅https://github.com/MvvmCross/MvvmCross/wiki/Databinding