public async Task LoadPage(string pageName, bool addToHistory = true)
{
if (pages.ContainsKey(pageName))
{
if (pages[pageName] != null)
{
if (currentPage != null)
{
PageTransitionAnimation animation = pages[pageName].animation.GetOpposite();
await currentPage.StartAnimation(false, animation);
currentPage.OnUnload();
}
currentPage = pages[pageName];
PageFrame.Content = pages[pageName];
if (addToHistory)
{
if (history.Count >= 5)
{
history.RemoveAt(history.Count - 1);
}
history.Insert(0, pageName);
}
pages[pageName].OnLoad();
await pages[pageName].StartAnimation(true);
}
}
}
public async Task StartAnimation(bool inwards, PageTransitionAnimation transitionAnimation)
{
if (inwards)
{
await StartInAnimation(animation);
}
else
{
await StartOutAnimation(animation);
}
}
public static PageTransitionAnimation GetOpposite(this PageTransitionAnimation animation)
{
switch (animation)
{
case PageTransitionAnimation.None:
return(PageTransitionAnimation.None);
case PageTransitionAnimation.SlideTop:
return(PageTransitionAnimation.SlideBottom);
case PageTransitionAnimation.SlideLeft:
return(PageTransitionAnimation.SlideRight);
case PageTransitionAnimation.SlideBottom:
return(PageTransitionAnimation.SlideTop);
case PageTransitionAnimation.SlideRight:
return(PageTransitionAnimation.SlideLeft);
default:
return(PageTransitionAnimation.None);
}
}
private async Task StartInAnimation(PageTransitionAnimation transitionAnimation)
{
if (transitionAnimation == PageTransitionAnimation.None)
{
return;
}
Storyboard sb = new Storyboard();
Timeline animation = null;
DoubleAnimation fadeAnimation = new DoubleAnimation
{
Duration = new Duration(TimeSpan.FromSeconds(animationDuration)),
From = 0,
To = 1,
DecelerationRatio = 0.9f
};
switch (transitionAnimation)
{
case PageTransitionAnimation.SlideTop:
animation = new ThicknessAnimation
{
Duration = new Duration(TimeSpan.FromSeconds(animationDuration)),
From = new Thickness(0, -MainWindow.Instance.Height, 0, MainWindow.Instance.Height),
To = new Thickness(0),
DecelerationRatio = 0.9f
};
break;
case PageTransitionAnimation.SlideLeft:
animation = new ThicknessAnimation
{
Duration = new Duration(TimeSpan.FromSeconds(animationDuration)),
From = new Thickness(-MainWindow.Instance.Width, 0, MainWindow.Instance.Width, 0),
To = new Thickness(0),
DecelerationRatio = 0.9f
};
break;
case PageTransitionAnimation.SlideBottom:
animation = new ThicknessAnimation
{
Duration = new Duration(TimeSpan.FromSeconds(animationDuration)),
From = new Thickness(0, MainWindow.Instance.Height, 0, -MainWindow.Instance.Height),
To = new Thickness(0),
DecelerationRatio = 0.9f
};
break;
case PageTransitionAnimation.SlideRight:
animation = new ThicknessAnimation
{
Duration = new Duration(TimeSpan.FromSeconds(animationDuration)),
From = new Thickness(MainWindow.Instance.Width, 0, -MainWindow.Instance.Width, 0),
To = new Thickness(0),
DecelerationRatio = 0.9f
};
break;
}
if (animation == null)
{
return;
}
Storyboard.SetTargetProperty(animation, new PropertyPath("Margin"));
Storyboard.SetTargetProperty(fadeAnimation, new PropertyPath("Opacity"));
sb.Children.Add(animation);
sb.Children.Add(fadeAnimation);
sb.Begin(this);
await Task.Delay((int)(animationDuration * 1000));
}
