public async void ScrollToSwitchCurrentCatalog(CatalogDirection dir)
{
if (IsLoading)
{
return;
}
var value = GetCatalogByDirction(dir);
if (value != null)
{
SetCurrentContent(value);
}
else
{
if (IsLoadingCatalogData)
{
ToastHelper.ShowMessage("目录数据加载中，请稍后");
return;
}
if (CurrentBook.CatalogList == null)
{
ToastHelper.ShowMessage("没有目录数据");
return;
}
await Task.Delay(10);
NavigationService.NavigateTo(typeof(CatalogPage));
}
}
/// <summary>
/// 根据方向获取目录
/// </summary>
/// <param name="dir"></param>
/// <returns></returns>
public BookCatalog GetCatalogByDirction(CatalogDirection dir)
{
if (CurrentCatalog == null || CurrentBook.CatalogList == null || CurrentBook.CatalogList.Count == 0)
{
return(null);
}
var temp = CurrentBook.CatalogList.FirstOrDefault(p => p.CatalogUrl == CurrentCatalog.CatalogUrl);
if (temp == null && dir == CatalogDirection.Next)
{
return(null);
}
if (temp == null && dir == CatalogDirection.Current)
{
return(CurrentCatalog);
}
var index = CurrentBook.CatalogList.IndexOf(temp);
switch (dir)
{
case CatalogDirection.Current:
return(temp);
case CatalogDirection.Next:
if (index < CurrentBook.CatalogList.Count - 1)
{
return(CurrentBook.CatalogList[index + 1]);
}
break;
case CatalogDirection.Pre:
if (index > 0)
{
return(CurrentBook.CatalogList[index - 1]);
}
break;
}
return(null);
}
private async void SwitchCatalog(CatalogDirection dir)
{
try
{
if (IsLoadingContent)
{
return;
}
IsLoadingContent = true;
await Task.Delay(0);
var vm = (BookContentPageViewModel)DataContext;
vm.ScrollToSwitchCurrentCatalog(dir);
}
catch (Exception e)
{
Console.WriteLine(e);
}
finally
{
IsLoadingContent = false;
}
}
/// <summary>
/// 根据方向获取目录数据
/// </summary>
/// <param name="dir"></param>
/// <param name="isShowLoading"></param>
/// <returns></returns>
public async Task <Tuple <List <string>, string, BookCatalog> > GetCatalogDataByDirection(CatalogDirection dir, bool isShowLoading = false)
{
var catalog = GetCatalogByDirction(dir);
if (catalog == null)
{
return(null);
}
var value = await GetCatalogContent(catalog, isShowLoading);
return(new Tuple <List <string>, string, BookCatalog>(value.Item1, value.Item2, catalog));
}
