//获得容器最上面页面的名称
public static string GetTop(Panel p)
{
//获取页面缓存
List <NameAndFrame> pages = GetPanelPages(p);
if (pages.Count == 0)
{
return(null);
}
NameAndFrame naf = pages[pages.Count - 1];
return(naf.name);
}
private static void OnPageNameChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
Panel c = (Panel)d;
//获取页面缓存
List <NameAndFrame> pages = GetPanelPages(c);
//旧页面变为不可见
if (e.OldValue != null)
{
NameAndFrame oldNaf = GetChildren((string)e.OldValue, pages);
if (oldNaf != null)
{
oldNaf.frame.Visibility = Visibility.Collapsed;
}
}
if (e.NewValue == null)
{
return;
}
string newName = (string)e.NewValue;
//如果不包含页面，说明页面没有打开，打开页面
NameAndFrame newui = GetChildren(newName, pages);
if (newui == null)
{
PageResourceContentLoader load = new PageResourceContentLoader();
load.BeginLoad(new Uri(e.NewValue + ".xaml", UriKind.Relative), null, new AsyncCallback(r =>
{
LoadResult ui = load.EndLoad(r);
FrameworkElement page = (FrameworkElement)ui.LoadedContent;
c.Children.Add(page);
//添加到页面缓存中
NameAndFrame newpage = new NameAndFrame(newName, page);
pages.Add(newpage);
}), 1);
}
else
{
//修改页面为可见
newui.frame.Visibility = Visibility.Visible;
//将新的放到栈顶
pages.Remove(newui);
pages.Add(newui);
}
}
private static void OnPageNameChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
Panel c = (Panel)d;
//获取页面缓存
List<NameAndFrame> pages = GetPanelPages(c);
//旧页面变为不可见
if (e.OldValue != null)
{
NameAndFrame oldNaf = GetChildren((string)e.OldValue, pages);
if (oldNaf != null)
{
oldNaf.frame.Visibility = Visibility.Collapsed;
}
}
if (e.NewValue == null)
{
return;
}
string newName = (string)e.NewValue;
//如果不包含页面，说明页面没有打开，打开页面
NameAndFrame newui = GetChildren(newName, pages);
if (newui == null)
{
PageResourceContentLoader load = new PageResourceContentLoader();
load.BeginLoad(new Uri(e.NewValue + ".xaml", UriKind.Relative), null, new AsyncCallback(r =>
{
LoadResult ui = load.EndLoad(r);
FrameworkElement page = (FrameworkElement)ui.LoadedContent;
c.Children.Add(page);
//添加到页面缓存中
NameAndFrame newpage = new NameAndFrame(newName, page);
pages.Add(newpage);
}), 1);
}
else
{
//修改页面为可见
newui.frame.Visibility = Visibility.Visible;
//将新的放到栈顶
pages.Remove(newui);
pages.Add(newui);
}
}
