private void AddMessage(string v)
{
ListBoxItem item = new ListBoxItem()
{
MaxWidth = 250
};
string user = v.Substring(0, v.IndexOf(':'));
string message = v.Substring(v.IndexOf(':') + 1);
StackPanel stack = new StackPanel();
Border border = new Border()
{
CornerRadius = new CornerRadius(5)
};
border.SetResourceReference(Control.BackgroundProperty, "ElementsColor");
border.Child = new TextBlock()
{
TextWrapping = TextWrapping.Wrap, Margin = new Thickness(5), Text = message
};
TextBlock tbMetaData = new TextBlock()
{
TextWrapping = TextWrapping.Wrap, HorizontalAlignment = user == UserName ? HorizontalAlignment.Right : HorizontalAlignment.Left, Margin = new Thickness(0, 5, 0, 5), Text = $"{DateTime.Now.ToShortTimeString()} {user}"
};
stack.Children.Add(border);
stack.Children.Add(tbMetaData);
item.Content = stack;
item.HorizontalAlignment = user == UserName ? HorizontalAlignment.Right : HorizontalAlignment.Left;
MessagesListBox.Items.Add(item);
MessagesListBox.ScrollIntoView(item);
}
private void AddToMessages(ChatMessage chatMessage)
{
_messages.Add(chatMessage);
MessageBox.Text = string.Empty;
var response = Client.PostMessage(chatMessage);
_messages.Add(response);
int lastMessageIndex = MessagesListBox.Items.Count - 1;
MessagesListBox.ScrollIntoView(MessagesListBox.Items[lastMessageIndex]);
}
private void ActiveConvoView_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
if (AtBottom())
{
scrollViewer?.ScrollToBottom();
}
else
{
if (loadingPrevMsgs)
{
loadingPrevMsgs = false;
MessagesListBox.ScrollIntoView(lastItem);
}
}
}
private void ScrollToBottomButton_OnClick(object sender, EventArgs e)
{
var _ = OnPressedCachedImage(ScrollToBottomButton);
object last = MessagesListBox.ItemsSource.Cast <object>().LastOrDefault();
if (last is null)
{
return;
}
LoadPreviousMessagesButton.IsVisible = LoadPreviousMessagesButton.IsEnabled = false;
MessagesListBox.ScrollTo(last, ScrollToPosition.Center, (e as ScrollToBottomEventArgs)?.Animated ?? true);
}
private void LoadPreviousMessagesButton_OnClicked(object sender, EventArgs e)
{
object scrollLock = MessagesListBox.ItemsSource.Cast <object>().FirstOrDefault();
if (scrollLock is null)
{
return;
}
if (BindingContext is ActiveConvoViewModel vm)
{
vm.LoadPreviousMessages().ContinueWith(_ =>
{
Device.BeginInvokeOnMainThread(() =>
{
LoadPreviousMessagesButton.IsVisible = LoadPreviousMessagesButton.IsEnabled = false;
MessagesListBox.ScrollTo(scrollLock, ScrollToPosition.Start, false);
});
});
}
}
