UWP中的FrameworkPropertyMetadata在哪里？

Question

和/或如何在我的控件上定义一个DependencyProperty来分离AffectsMeasure ？

编辑：哦，刚看到这一点-我必须呼吁InvalidateMeasure在this的propertychangedhandler？

Answer 1

抱歉。 对于UWP，不支持AffectsMeasure 。 对于Framework 3+，它可以工作。 对于默认的UWP绑定，我正在使用CodeSnipped功能。 通过事件处理，您可以采取透明行动。 对于我的模型，我的UWP codeSnippet的结果如下所示：

    #region IsSelected

    public static readonly DependencyProperty IsSelectedProperty =
        DependencyProperty.Register("IsSelected", typeof(bool), typeof(PositionModel),
            new PropertyMetadata((bool)false,
                new PropertyChangedCallback(OnIsSelectedChanged)));

    public bool IsSelected
    {
        get { return (bool)GetValue(IsSelectedProperty); }
        set { SetValue(IsSelectedProperty, value); }
    }

    private static void OnIsSelectedChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        PositionModel target = (PositionModel)d;
        bool oldIsSelected = (bool)e.OldValue;
        bool newIsSelected = target.IsSelected;
        target.OnIsSelectedChanged(oldIsSelected, newIsSelected);
    }

    protected virtual void OnIsSelectedChanged(bool oldIsSelected, bool newIsSelected)
    {
       // Do what your need in your property changed event
       // In my case, I just raise the PropertyChanged for PropertyChangedEventHandler
       // RaisePropertyChanged(nameof(IsSelected));
    }
    #endregion

XAML：

<Rectangle Fill="Black" Visibility="{x:Bind IsSelected, Mode=OneWay, Converter={StaticResource BoolToVis}}" />

Windows 10，Store，VS 2017，Microsoft.NETCore.UniversalWindowsPlatform版本5.2.3