如何绑定到MvvmCross中查看的Layout_Weight？ [英] How to bind to View's layout_weight in MvvmCross?

问题描述

绑定到View(或任何其他Android控件)权重的最简单方法是什么？因为此属性没有setter，所以我尝试了自定义绑定，但id似乎不起作用：

public class ViewWeightCustomBinding : MvxAndroidTargetBinding
{
    public ViewWeightCustomBinding(object target) : base(target)
    {
    }

    public override Type TargetType
    {
        get { return typeof (int); }
    }

    protected override void SetValueImpl(object target, object value)
    {
        var realTarget = target as View;
        if(target == null)
            return;

        ViewGroup.LayoutParams layoutParameters = realTarget.LayoutParameters;
        realTarget.LayoutParameters = new LinearLayout.LayoutParams(layoutParameters.Width, layoutParameters.Height,
                                                                  (int) value);
    }
}

安装程序中的注册：

protected override void FillTargetFactories(IMvxTargetBindingFactoryRegistry registry)
{
    registry.RegisterFactory(new MvxSimplePropertyInfoTargetBindingFactory(typeof(ViewWeightCustomBinding), typeof(View), "ViewWeight"));
    base.FillTargetFactories(registry);
}

和.axml

 <View
        android:layout_width="0dp"
        android:layout_height="3dp"
        android:background="@color/green_holo"
        local:MvxBind="ViewWeight Id" />

我可以在调试窗口中看到警告：

[0：] MvxBind：警告：5.20无法为ID的绑定View Weight创建目标绑定 [0：]MvxBind：警告：5.20无法为ID的绑定视图创建目标绑定 01-31 10：54：57.247 i/mono-stdout(3795)：MvxBind：Warning：5.20无法为ID的绑定视图创建目标绑定

推荐答案

MvxSimplePropertyInfoTargetBindingFactory只能用于真实的C#属性。

对于发明的"伪"属性，您需要使用n=28教程中所示的自定义绑定注册-

    protected override void FillTargetFactories(Cirrious.MvvmCross.Binding.Bindings.Target.Construction.IMvxTargetBindingFactoryRegistry registry)
    {
        registry.RegisterCustomBindingFactory<BinaryEdit>(
                        "N28", 
                        binary => new BinaryEditFooTargetBinding(binary) );
        base.FillTargetFactories(registry);
    }

https://github.com/MvvmCross/NPlus1DaysOfMvvmCross/blob/master/N-28-CustomBinding/CustomBinding.Droid/Setup.cs

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