public async void Search(string query, User from, SearchMessagesFilter filter)
{
if (string.Equals(_query, query) && _from?.Id == from?.Id && _filter?.GetType() == filter?.GetType() && PreviousCanExecute())
{
PreviousExecute();
}
else
{
From = from;
Filter = filter;
Query = query;
var chat = _dialog.Chat;
if (chat == null)
{
return;
}
Items = null;
SelectedItem = null;
if (string.IsNullOrEmpty(query) && from == null && filter == null)
{
return;
}
var fromMessageId = 0L;
var field = _dialog.ListField;
if (field != null)
{
var panel = field.ItemsPanelRoot as ItemsStackPanel;
if (panel != null && panel.LastVisibleIndex >= 0 && panel.LastVisibleIndex < _dialog.Items.Count && _dialog.Items.Count > 0)
{
fromMessageId = _dialog.Items[panel.LastVisibleIndex].Id;
}
}
var collection = new SearchChatMessagesCollection(ProtoService, chat.Id, query, from?.Id ?? 0, fromMessageId, filter);
var result = await collection.LoadMoreItemsAsync(100);
if (result.Count > 0)
{
var target = collection.FirstOrDefault();
if (fromMessageId != 0)
{
var closest = collection.Aggregate((x, y) => Math.Abs(x.Id - fromMessageId) < Math.Abs(y.Id - fromMessageId) ? x : y);
if (closest != null)
{
target = closest;
}
}
Items = collection;
SelectedItem = target;
await Dialog.LoadMessageSliceAsync(null, target.Id);
}
else
{
Items = collection;
SelectedItem = null;
}
}
}
