private object GetPreviousNavigationTarget()
{
var currentContent = this.Content;
if (NavigationTargets == null || NavigationTargets.Contains(currentContent) == false)
{
return(null);
}
var index = NavigationTargets.IndexOf(currentContent) - 1;
if (index < 0)
{
index = NavigationTargets.Count - 1;
}
return(NavigationTargets[index]);
}
private void UpdateTouchEventHandler()
{
this.PreviewMouseLeftButtonDown -= SlideToNavigateFrame_PreviewMouseLeftButtonDown;
this.PreviewMouseMove -= SlideToNavigateFrame_PreviewMouseMove;
this.PreviewMouseLeftButtonUp -= SlideToNavigateFrame_PreviewMouseLeftButtonUp;
this.MouseLeave -= SlideToNavigateFrame_MouseLeave;
if (NavigationTargets == null || NavigationTargets.Count == 0 || NavigationTargets.Contains(this.Content) == false)
{
// 若目前所導覽到的畫面並不存在於 NavigationTargets，則不啟用觸控滑動換頁
return;
}
this.PreviewMouseLeftButtonDown += SlideToNavigateFrame_PreviewMouseLeftButtonDown;
this.PreviewMouseMove += SlideToNavigateFrame_PreviewMouseMove;
this.PreviewMouseLeftButtonUp += SlideToNavigateFrame_PreviewMouseLeftButtonUp;
this.MouseLeave += SlideToNavigateFrame_MouseLeave;
}
private object GetNextNavigationTarget()
{
var currentContent = this.Content;
if (NavigationTargets == null || NavigationTargets.Contains(currentContent) == false)
{
return(null);
}
var index = NavigationTargets.IndexOf(currentContent) + 1;
if (index >= NavigationTargets.Count)
{
index = 0;
}
return(NavigationTargets[index]);
}