Microsoft Surface: Когда вызывается раскадровка #?

Question

У меня есть следующий код:

private void Package_ContactDown(object sender, ContactEventArgs e) 
     { 
      ScatterViewItem svi = new ScatterViewItem(); 
      svi.Orientation = 0; 
      removeShadow(svi); 
      svi.IsActive = true; 
      PackageView view = new PackageView(sourceFile, this); 
      view.setScatterViewItem(svi); 
      svi.Width = 1024; 
      svi.Height = 768; 
      svi.Center = new Point(512, 384); 

      Viewbox box = new Viewbox(); 
      box.Name = "box"; 
      box.Child = view; 
      this.RegisterName(box.Name, box); 

      Viewbox boxSmall = new Viewbox(); 
      boxSmall.Name = "boxSmall"; 
      this.RegisterName(boxSmall.Name, boxSmall); 
      TextBlock txt = new TextBlock(); 

      txt.Foreground = Brushes.White; 
      txt.Text = "Package of class"; 
      boxSmall.Child = txt; 
      boxSmall.Opacity = 0; 
      boxSmall.IsHitTestVisible = false; 

      Rectangle border = new Rectangle(); 
      border.Name = "border"; 
      this.RegisterName(border.Name, border); 
      border.Fill = Brushes.Transparent; 
      border.Stroke = Brushes.White; 
      border.StrokeThickness = 2; 
      border.Opacity = 0; 

      Grid g = new Grid(); 
      g.Background = this.FindResource("WindowBackground") as ImageBrush; 
      g.Children.Add(box); 
      g.Children.Add(boxSmall); 
      g.Children.Add(border); 
      svi.Content = g; 

      window.IconDisplay.Items.Add(svi); 

      DoubleAnimation animation = new DoubleAnimation(); 
      animation.From = 0.0; 
      animation.To = 1.0; 
      animation.Duration = new Duration(TimeSpan.FromSeconds(3)); 
      animation.AutoReverse = false; 

      Storyboard storyboard = new Storyboard(); 
      storyboard.Children.Add(animation); 
      Storyboard.SetTargetName(animation, boxSmall.Name); 
      Storyboard.SetTargetProperty(animation, new PropertyPath(Viewbox.OpacityProperty)); 

      DoubleAnimation animation2 = new DoubleAnimation(); 
      animation2.From = 1.0; 
      animation2.To = 0.0; 
      animation2.Duration = new Duration(TimeSpan.FromSeconds(3)); 
      animation2.AutoReverse = false; 

      Storyboard storyboard2 = new Storyboard(); 
      storyboard2.Children.Add(animation2); 
      Storyboard.SetTargetName(animation2, box.Name); 
      Storyboard.SetTargetProperty(animation2, new PropertyPath(Viewbox.OpacityProperty)); 

      DoubleAnimation animation3 = new DoubleAnimation(); 
      animation3.From = 0.0; 
      animation3.To = 1.0; 
      animation3.Duration = new Duration(TimeSpan.FromSeconds(3)); 
      animation3.AutoReverse = false; 

      Storyboard storyboard3 = new Storyboard(); 
      storyboard3.Children.Add(animation3); 
      Storyboard.SetTargetName(animation3, border.Name); 
      Storyboard.SetTargetProperty(animation3, new PropertyPath(Rectangle.OpacityProperty)); 

      svi.SizeChanged += delegate(object s, SizeChangedEventArgs args) 
      { 
       if (args.NewSize.Width < 150 && args.NewSize.Height < 150 && !isSmall) 
       { 
        svi.CanScale = false; 
        storyboard.Begin(this); 
        storyboard2.Begin(this); 
        storyboard3.Begin(this); 
        storyboard3.Completed += delegate(object sender2, EventArgs args2) 
        { 
         Console.WriteLine("Storyboard completed"); 
         svi.CanScale = true; 
        }; 
        isSmall = true; 
       } 

       if (args.NewSize.Width > 150 && args.NewSize.Height > 150 && isSmall) 
       { 
        isSmall = false; 
       } 
      }; 

     } 

И я заметил, что раскадровка # завершено событие никогда не срабатывает. Зачем? И еще вопрос ... Есть ли способ отменить все эти 3 анимации? Если я хочу отображать анимацию наоборот?

Answer 1

Завершенное событие не будет срабатывать в первый раз, потому что оно не установлено до вызова метода begin. Установите законченного обработчика, затем вызовите начало, и вы увидите, как обработчик получает вызов.

Есть ли причина, по которой у вас есть три раскадровки? Раскадровки могут содержать несколько анимаций, и вы можете просто поместить все анимации в одну раскадровку. Это упростит реверсирование раскадровки.

 DoubleAnimation animation = new DoubleAnimation(); 
     animation.From = 0.0; 
     animation.To = 1.0; 
     animation.Duration = new Duration(TimeSpan.FromSeconds(3)); 
     animation.AutoReverse = false; 

     DoubleAnimation animation2 = new DoubleAnimation(); 
     animation2.From = 1.0; 
     animation2.To = 0.0; 
     animation2.Duration = new Duration(TimeSpan.FromSeconds(3)); 
     animation2.AutoReverse = false; 

     DoubleAnimation animation3 = new DoubleAnimation(); 
     animation3.From = 0.0; 
     animation3.To = 1.0; 
     animation3.Duration = new Duration(TimeSpan.FromSeconds(3)); 
     animation3.AutoReverse = false; 

     Storyboard storyboard = new Storyboard(); 
     storyboard.AutoReverse = true; 
     storyboard.Children.Add(animation); 
     Storyboard.SetTargetName(animation, boxSmall.Name); 
     Storyboard.SetTargetProperty(animation, new PropertyPath(Viewbox.OpacityProperty)); 

     storyboard.Children.Add(animation2); 
     Storyboard.SetTargetName(animation2, box.Name); 
     Storyboard.SetTargetProperty(animation2, new PropertyPath(Viewbox.OpacityProperty)); 

     storyboard.Children.Add(animation3); 
     Storyboard.SetTargetName(animation3, border.Name); 
     Storyboard.SetTargetProperty(animation3, new PropertyPath(Rectangle.OpacityProperty)); 

     svi.SizeChanged += delegate(object s, SizeChangedEventArgs args) 
     { 
      if (args.NewSize.Width < 150 && args.NewSize.Height < 150 && !isSmall) 
      { 
       svi.CanScale = false; 
       storyboard.Completed += (o, s) => 
       { 
        Console.WriteLine("Storyboard completed"); 
        svi.CanScale = true; 
       }; 
       storyboard.Begin(this); 
       isSmall = true; 
      } 

      if (args.NewSize.Width > 150 && args.NewSize.Height > 150 && isSmall) 
      { 
       isSmall = false; 
      } 
     };