在以编程方式添加的控件上使用情节提要动画

Question

我正在尝试将新控件淡入到我的应用程序的“应用程序”区域，该区域是在删除现有控件后以编程方式添加的。我的代码如下所示：

        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所有内容:(

Answer 1

我不会为 NameScopes 等而烦恼，而是宁愿使用 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方法中使用这个作为参数解决了这个问题，试试：

sb.Begin(this);

因为名字是在窗口中注册的。

Answer 3

我同意，在这种情况下使用名称范围可能是错误的。使用 SetTarget 比使用 SetTargetName 更简单、更容易。

如果它对其他人有帮助，这里是我用来突出显示表格中特定单元格的方法，其中突出显示会衰减为空。添加新答案时，它有点像 StackOverflow 的突出显示。

    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);

Answer 4

这可能很奇怪，但我的解决方案是同时使用这两种方法：

Storyboard.SetTargetName(DA, myObjectName);

Storyboard.SetTarget(DA, myRect);

sb.Begin(this);

在这种情况下没有错误。

看看我用过的代码。

 int n = 0;
        bool isWorking;
        Storyboard sb;
        string myObjectName;
         UIElement myElement;

        int idx = 0;

        void timer_Tick(object sender, EventArgs e)
        {
            if (isWorking == false)
            {
                isWorking = true;
                try
                {
                      myElement = stackObj.Children[idx];

                    var possibleIDX = idx + 1;
                    if (possibleIDX == stackObj.Children.Count)
                        idx = 0;
                    else
                        idx++;

                    var myRect = (Rectangle)myElement;

                   // Debug.WriteLine("TICK: " + myRect.Name);

                    var dur = TimeSpan.FromMilliseconds(2000);

                    var f = CreateVisibility(dur, myElement, false);

                    sb.Children.Add(f);

                    Duration d = TimeSpan.FromSeconds(2);
                    DoubleAnimation DA = new DoubleAnimation() { From = 1, To = 0, Duration = d };

                    sb.Children.Add(DA);
                    myObjectName = myRect.Name;  
                   Storyboard.SetTargetName(DA, myObjectName);
                   Storyboard.SetTarget(DA, myRect);

                    Storyboard.SetTargetProperty(DA, new PropertyPath("Opacity"));

                    sb.Begin(this);

                    n++;
                }
                catch (Exception ex)
                {
                    Debug.WriteLine(ex.Message + "   " + DateTime.Now.TimeOfDay);
                }

                isWorking = false;
            }
        }