Microsoft Surface: когда вызывается Storyboard #?

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 Событие Storyboard # complete никогда не запускается.Зачем?И дополнительный вопрос ... Есть ли способ отменить все эти 3 анимации?Если я хочу отображать анимацию наоборот?

Answer 1

Завершенное событие не сработает в первый раз, потому что оно не установлено до вызова метода begin.Установите обработчик завершения, затем вызовите начало, и вы должны увидеть, как вызывается обработчик.

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