在编程添加的控件上使用Storyboard动画

Question

我正在尝试淡入我的应用程序的"app"区域的新控件,该区域在删除现有控件后以编程方式添加.我的代码看起来像这样:

        void settingsButton_Clicked(object sender, EventArgs e)
    {
        ContentCanvas.Children.Clear();

        // Fade in settings panel
        NameScope.SetNameScope(this, new NameScope());

        SettingsPane s = new SettingsPane();
        s.Name = "settingsPane";

        this.RegisterName(s.Name, s);
        this.Resources.Add(s.Name, s);

        Storyboard sb = new Storyboard();

        DoubleAnimation settingsFade = new DoubleAnimation();
        settingsFade.From = 0;
        settingsFade.To = 1;
        settingsFade.Duration = new Duration(TimeSpan.FromSeconds(0.33));
        settingsFade.RepeatBehavior = new RepeatBehavior(1);
        Storyboard.SetTargetName(settingsFade, s.Name);
        Storyboard.SetTargetProperty(settingsFade, new PropertyPath(UserControl.OpacityProperty));

        ContentCanvas.Children.Add(s);

        sb.Children.Add(settingsFade);
        sb.Begin();
    }

但是,当我运行此代码时,我收到错误"没有适用的名称范围来解析名称'settingsPane'."

我可能做错了什么？我很确定我已经正确注册了一切:(

Answer 1

我不会为NameScopes等烦恼,而宁愿使用Storyboard.SetTarget.

var b = new Button() { Content = "abcd" };
stack.Children.Add(b);

var fade = new DoubleAnimation()
{
    From = 0,
    To = 1,
    Duration = TimeSpan.FromSeconds(5),
};

Storyboard.SetTarget(fade, b);
Storyboard.SetTargetProperty(fade, new PropertyPath(Button.OpacityProperty));

var sb = new Storyboard();
sb.Children.Add(fade);

sb.Begin();

Answer 2

我在begin方法中使用this作为参数解决了问题,请尝试:

sb.Begin(this);

因为名称已在窗口中注册.

Answer 3

我同意,在这种情况下,名称范围可能是错误的.使用SetTarget而不是SetTargetName更简单,更容易.

如果它可以帮助其他任何人,这就是我用来突出表格中特定单元格的内容,其突出显示无效.添加新答案时,它有点像StackOverflow高亮显示.

    TableCell cell = table.RowGroups[0].Rows[row].Cells[col];

    // The cell contains just one paragraph; it is the first block
    Paragraph p = (Paragraph)cell.Blocks.FirstBlock;

    // Animate the paragraph: fade the background from Yellow to White,
    // once, through a span of 6 seconds.

    SolidColorBrush brush = new SolidColorBrush(Colors.Yellow);
    p.Background = brush;
    ColorAnimation ca1 = new ColorAnimation()
    {
            From = Colors.Yellow,
            To = Colors.White,
            Duration = new Duration(TimeSpan.FromSeconds(6.0)),
            RepeatBehavior = new RepeatBehavior(1),
            AutoReverse = false,
    };

    brush.BeginAnimation(SolidColorBrush.ColorProperty, ca1);