c# - UWP中的FrameworkPropertyMetadata在哪里？

和/或如何在控件中定义DependencyProperty的AffectsMeasure？

编辑:哦，刚刚看到了-我必须在propertychangedhandler中的InvalidateMeasure上调用this吗？

最佳答案

对不起。对于UWP，不支持AffectsMeasure。对于Framework 3+，它可以工作。对于默认的UWP绑定(bind)，我正在使用CodeSnipped功能。通过事件处理，您可以透明地进行操作。 UWP的codeSnippet的结果对于我的模型如下所示:

    #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，商店，VS 2017，
Microsoft.NETCore.UniversalWindowsPlatform版本5.2.3

关于c# - UWP中的FrameworkPropertyMetadata在哪里？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/33709028/