Question

我希望动画一个进度，因此完成一个循环需要1分钟。我的代码是：

ProgressBar _progressSec = new ProgressBar();
_progressSec.Name = "_progressSec";
_progressSec.Minimum = 0;
_progressSec.Maximum = 60;
_progressSec.Value = DateTime.Now.Second;
this.RegisterName(_progressSec.Name, _progressSec);

NewGrid.Children.Add(_progressSec);

Storyboard newStory = new Storyboard();
DoubleAnimation newAnimation = new DoubleAnimation();
newAnimation.To = 60;
newAnimation.BeginTime = new TimeSpan(DateTime.Now.Second);
newAnimation.RepeatBehavior = RepeatBehavior.Forever;
newAnimation.Duration = new Duration(TimeSpan.FromMinutes(1));
newStory.Children.Add(newAnimation);

Storyboard.SetTarget(newAnimation, _progressSec);
Storyboard.SetTargetProperty(newAnimation, new PropertyPath(ProgressBar.ValueProperty));

newStory.Begin();

此栏需要1分钟才能完成一个循环，这不是我想要的。因此，如果我在40秒开始，则需要一分钟才能达到60秒。

我想要做的是从当前的秒值开始，每秒递增一次，当它达到60秒时，再次开始，所以如果从40秒开始，则需要20秒才能达到一分钟。当它达到一分钟时，我希望它再次开始（在0）。当然，我可以说我正在开发一个时钟/计时器，但我想我会更好地解释运行代码时发生了什么。

当我将From值添加到newAnimation时，它总是从该值开始，而不是从BeginTime值开始。

有什么想法吗？

感谢。

Answer 1

好吧，如果你想让你的动画花费一分钟以上的时间，你必须告诉它：

int from = 50;
int to = 60;
newAnimation.From = from;
newAnimation.To = to;
newAnimation.Duration = new Duration(TimeSpan.FromSeconds(to - from));

Answer 2

感谢svick，我找到了如何做到这一点。解决方案如下：

    ProgressBar _progressSec = new ProgressBar();
    DoubleAnimation newAnimation = new DoubleAnimation();
    Storyboard newStory = new Storyboard();

    private void UserControl_Loaded(object sender, RoutedEventArgs e)
    {
        _progressSec.Name = "_progressSec";
        _progressSec.Minimum = 0;
        _progressSec.Maximum = 59;
        _progressSec.Value = DateTime.Now.Second;
        this.RegisterName(_progressSec.Name, _progressSec);

        NewGrid.Children.Add(_progressSec);

        int from = DateTime.Now.Second;
        int to = 59;
        newAnimation.From = from;
        newAnimation.To = to;
        newAnimation.Duration = new Duration(TimeSpan.FromSeconds(to - from));

        newStory.Completed += new EventHandler(story_Completed);
        newStory.Children.Add(newAnimation);

        Storyboard.SetTarget(newAnimation, _progressSec);
        Storyboard.SetTargetProperty(newAnimation, new PropertyPath(ProgressBar.ValueProperty));

        newStory.Begin();
    }

    void story_Completed(object sender, EventArgs e)
    {
        int from2 = 0;
        int to2 = 59;
        newAnimation.From = from2;
        newAnimation.To = to2;
        newAnimation.Duration = new Duration(TimeSpan.FromMinutes(1));

        newStory.Children.Add(newAnimation);

        Storyboard.SetTarget(newAnimation, _progressSec);
        Storyboard.SetTargetProperty(newAnimation, new PropertyPath(ProgressBar.ValueProperty));

        newStory.Begin();
    }

WPF - 根据时间动画进度条

2 个答案: