private async void ScrollViewer_ViewChanged(object sender, ScrollViewerViewChangedEventArgs e)
{
var sv = sender as ScrollViewer;
int index = LostAndFoundPagePivot.SelectedIndex;
if (!e.IsIntermediate)
{
if (sv.VerticalOffset >= sv.ScrollableHeight - 200)
{
if (VM[index].next_page_url == null)
{
IsProgressRingActive[index] = false; //已请求所有
}
else
{
LostAndFoundPageViewModel temp = await Model.LoadItems(VM[index].next_page_url);
foreach (LFItem i in temp.data)
{
VM[index].data.Add(i);
}
VM[index].next_page_url = temp.next_page_url;
}
}
}
}
private async void ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
if (isComboxLoaded)
{
if (combox.SelectedIndex == 0)
{
BaseUrl = "http://hongyan.cqupt.edu.cn/laf/api/view/found/";
}
else
{
BaseUrl = "http://hongyan.cqupt.edu.cn/laf/api/view/lost/";
}
for (int i = 0; i < 8; i++)
{
VM[i].data.Clear();
IsItemLoaded[i] = false;
}
int index = LostAndFoundPagePivot.SelectedIndex;
LostAndFoundPageViewModel temp = await Model.LoadItems(BaseUrl, index);
foreach (LFItem i in temp.data)
{
VM[index].data.Add(i);
}
VM[index].next_page_url = temp.next_page_url;
if (VM[index].next_page_url == null)
{
IsProgressRingActive[index] = false;
}
}
}
public async Task <LostAndFoundPageViewModel> LoadItems(string uri, int cat = 0)
{
LostAndFoundPageViewModel LFPVM = new LostAndFoundPageViewModel();
string content;
content = await GetJson(uri + catalog[cat]);
if (content != "NetworkError")
{
if (content == "")
{
return(LFPVM);
}
LFPVM = JsonToObject(content);
foreach (LFItem i in LFPVM.data)
{
if (i.wx_avatar == "")
{
continue;
}
else if (i.wx_avatar[0] == '/')
{
i.wx_avatar = "http://hongyan.cqupt.edu.cn" + i.wx_avatar;
}
i.HeadImg = new BitmapImage(new Uri(i.wx_avatar));
}
}
return(LFPVM);
}
public LostAndFoundPage()
{
for (byte i = 0; i < 8; i++)
{
IsProgressRingActive.Add(true);
VM[i] = new LostAndFoundPageViewModel();
}
this.InitializeComponent();
NavigationCacheMode = NavigationCacheMode.Enabled; //页面缓存,页面返回时仅调用OnNavigatedTo方法
}
private async void LostAndFoundPageRefreshAppBarButton_Click(object sender, RoutedEventArgs e)
{
int index = LostAndFoundPagePivot.SelectedIndex;
if (IsItemLoaded[index])
{
IsProgressRingActive[index] = true;
VM[index].data.Clear();
LostAndFoundPageViewModel temp = await Model.LoadItems(BaseUrl, index);
foreach (LFItem i in temp.data)
{
VM[index].data.Add(i);
}
VM[index].next_page_url = temp.next_page_url;
if (VM[index].next_page_url == null)
{
IsProgressRingActive[index] = false;
}
}
}
private async void LostAndFoundPagePivot_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
int index = LostAndFoundPagePivot.SelectedIndex;
if (!IsItemLoaded[index])
{
LostAndFoundPageViewModel temp = await Model.LoadItems(BaseUrl, index);
foreach (LFItem i in temp.data)
{
VM[index].data.Add(i);
}
VM[index].next_page_url = temp.next_page_url;
if (VM[index].next_page_url == null)
{
IsProgressRingActive[index] = false;
}
}
IsItemLoaded[index] = true;
}
