完成后如何删除动画

Drarig29 发表于 Dev

德拉格29

因此，根据上述问题的答案，我必须在完成动画后将其删除。但是怎么办呢？

这是我的代码：

public class GridLengthAnimation : AnimationTimeline {

    static GridLengthAnimation() {
        FromProperty = DependencyProperty.Register("From", typeof(GridLength), typeof(GridLengthAnimation));
        ToProperty = DependencyProperty.Register("To", typeof(GridLength), typeof(GridLengthAnimation));
    }

    public override Type TargetPropertyType {
        get { return typeof(GridLength); }
    }

    protected override Freezable CreateInstanceCore() {
        return new GridLengthAnimation();
    }

    public ContentElement Target { get; set; }

    public static readonly DependencyProperty FromProperty;
    public GridLength From {
        get { return (GridLength) GetValue(FromProperty); }
        set { SetValue(FromProperty, value); }
    }

    public static readonly DependencyProperty ToProperty;
    public GridLength To {
        get { return (GridLength) GetValue(ToProperty); }
        set { SetValue(ToProperty, value); }
    }

    public void BeginAnimation() {
        Target.BeginAnimation(ColumnDefinition.WidthProperty, null);
        Target.BeginAnimation(ColumnDefinition.WidthProperty, this);
    }

    public IEasingFunction EasingFunction { get; set; } = new CubicEase() { EasingMode = EasingMode.EaseInOut };

    public override object GetCurrentValue(object defaultOriginValue, object defaultDestinationValue, AnimationClock animationClock) {
        double fromValue = ((GridLength) GetValue(FromProperty)).Value;
        double toValue = ((GridLength) GetValue(ToProperty)).Value;
        double newValue = 0;

        if ((fromValue > toValue)) {
            newValue = (1 - EasingFunction.Ease(animationClock.CurrentProgress.Value)) * (fromValue - toValue) + toValue;
            return new GridLength(newValue, GridUnitType.Star);
        } else {
            newValue = EasingFunction.Ease(animationClock.CurrentProgress.Value) * (toValue - fromValue) + fromValue;
            return new GridLength(newValue, GridUnitType.Star);
        }
    }
}

要开始动画，我在MainWindows.xaml.cs文件中这样做：

GridLengthAnimation gridAnim = new GridLengthAnimation() {
    Name = "gridAnim",
    Target = mainGrid.ColumnDefinitions[1],
    Duration = new Duration(TimeSpan.FromMilliseconds(1000))
};

gridAnim.From = new GridLength(1, GridUnitType.Star);
gridAnim.To = new GridLength(0, GridUnitType.Star);

gridAnim.BeginAnimation();

动画制作完成后在哪里可以删除？

德拉格29

我发现我的解决方案在这里，在“从一个单独的属性中删除动画”的一部分。

我将此添加到我的GridLengthAnimation：

public void BeginAnimation() {
    Completed += GridLengthAnimation_Completed;
    Target.BeginAnimation(ColumnDefinition.WidthProperty, null);
    Target.BeginAnimation(ColumnDefinition.WidthProperty, this);
}

private void GridLengthAnimation_Completed(object sender, EventArgs e) {
    //unlocks the property
    Target.BeginAnimation(ColumnDefinition.WidthProperty, null);

    //holds the value at the end
    ((ColumnDefinition) Target).Width = new GridLength(((GridLength) GetValue(ToProperty)).Value, GridUnitType.Star);
}

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