private async void Page_OnLoaded(object sender, RoutedEventArgs e)
{
// load name of the user
Title = "Chatting with " + (await SharedStuff.Database.Table <DatabaseHelper.Users>().Where(row => row.Username == Username)
.FirstAsync()).Name;
// load fist 100 messages
var messages = await SharedStuff.Database.QueryAsync <DatabaseHelper.Messages>
(DatabaseHelper.LastRowsQuery(0, 100), Username);
if (messages.Count < 100) // prevent additional load on db
{
_reachedEnd = true;
}
foreach (var message in messages)
{
if (message.Type == 0)
{
MessagesList.Insert(0, new ChatMessagesNotify
{
MyMessage = message.MyMessage,
Message = message.Payload,
FullDate = message.Date,
Type = message.Type,
Sent = 0,
Progress = 101
});
}
else if (message.Type == 1)
{
var fileInfo = await SharedStuff.Database.Table <DatabaseHelper.Files>()
.FirstAsync(file => file.Token == message.Payload);
var downloadButtonIcon = PackIconKind.Download;
if (!string.IsNullOrEmpty(fileInfo.Location))
{
downloadButtonIcon = File.Exists(fileInfo.Location) ? PackIconKind.File : PackIconKind.DownloadOff;
}
MessagesList.Insert(0, new ChatMessagesNotify
{
MyMessage = message.MyMessage,
Message = fileInfo.Name,
FullDate = message.Date,
Type = message.Type,
Sent = 0,
Token = message.Payload,
DownloadButtonIcon = downloadButtonIcon,
Progress = 101
});
}
}
MainScrollViewer.ScrollToBottom(); // Go to the last of scroll view that is actually the first of it
MainScrollViewer.UpdateLayout();
_stopLoading = false;
}
/// <summary>
/// Add message to UI
/// </summary>
/// <param name="message">The message to add</param>
public void AddMessage(ChatMessagesNotify message)
{
_lastMessageIndex++; //TODO: Will this make some problems when the message is not sent?
Application.Current.Dispatcher.Invoke(() => MessagesList.Add(message));
if (!message.MyMessage)
{
_stopLoading = true;
// scroll to bottom if needed
MainScrollViewer.UpdateLayout();
if (MainScrollViewer.ScrollableHeight - MainScrollViewer.VerticalOffset < 30)
{
MainScrollViewer.ScrollToBottom();
MainScrollViewer.UpdateLayout();
}
_stopLoading = false;
}
}
/// <summary>
/// Use this method to get older messages when VerticalOffset reaches 0 (scrolled to top)
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private async void MainScrollViewer_OnScrollChanged(object sender, ScrollChangedEventArgs e)
{
if (!_stopLoading && !_reachedEnd && Math.Abs(e.VerticalOffset) < 1) // load more messages
{
_stopLoading = true;
// get last height
double lastHeight = MainScrollViewer.ScrollableHeight;
var messages = await SharedStuff.Database.QueryAsync <DatabaseHelper.Messages>
(DatabaseHelper.LastRowsQuery(_lastMessageIndex, 100), Username);
_lastMessageIndex += 100;
// check if we have reached the end
if (messages.Count < 100)
{
_reachedEnd = true;
}
if (messages.Count == 0)
{
return;
}
// insert these messages at the end of the list view (that is first of the collation)
foreach (var message in messages)
{
/*MessagesList.Insert(0, new ChatMessagesNotify
* {
* MyMessage = message.MyMessage,
* Message = message.Payload,
* FullDate = message.Date,
* Type = message.Type
* });*/
if (message.Type == 0)
{
MessagesList.Insert(0, new ChatMessagesNotify
{
MyMessage = message.MyMessage,
Message = message.Payload,
FullDate = message.Date,
Type = message.Type,
Sent = 0,
Progress = 101
});
}
else if (message.Type == 1)
{
var fileInfo = await SharedStuff.Database.Table <DatabaseHelper.Files>()
.FirstAsync(file => file.Token == message.Payload);
var downloadButtonIcon = PackIconKind.Download;
if (!string.IsNullOrEmpty(fileInfo.Location))
{
downloadButtonIcon = File.Exists(fileInfo.Location) ? PackIconKind.File : PackIconKind.DownloadOff;
}
MessagesList.Insert(0, new ChatMessagesNotify
{
MyMessage = message.MyMessage,
Message = fileInfo.Name,
FullDate = message.Date,
Type = message.Type,
Sent = 0,
Token = message.Payload,
DownloadButtonIcon = downloadButtonIcon,
Progress = 101
});
}
}
MainScrollViewer.UpdateLayout();
MainScrollViewer.ScrollToVerticalOffset(MainScrollViewer.ScrollableHeight - lastHeight); // tricky part; calculate the delta of height adding and go to that position from top
MainScrollViewer.UpdateLayout();
_stopLoading = false;
}
}
private async void MessageTextBox_OnKeyDown(object sender, KeyEventArgs e)
{
if ((Keyboard.Modifiers & ModifierKeys.Control) == ModifierKeys.Control)
{
if (Keyboard.IsKeyDown(Key.Enter))
{
string message = MessageTextBox.Text.Trim().TrimEnd(Environment.NewLine.ToCharArray());
// do not send the message if it's empty
if (string.IsNullOrWhiteSpace(message))
{
return;
}
if (SharedStuff.Websocket.IsAlive)
{
string id = Guid.NewGuid().ToString();
await Task.Run(() => SendMessage(message, id)); // send message over network
var msgUi = new ChatMessagesNotify
{
MyMessage = true,
Message = message,
FullDate = DateTime.Now,
Type = 0,
Sent = 1
};
AddMessage(msgUi); // add it to ui
SharedStuff.PendingMessages.Add(id, msgUi); // add message to pending messages
}
else
{
var msgUi = new ChatMessagesNotify
{
MyMessage = true,
Message = message,
FullDate = DateTime.Now,
Type = 0,
Sent = 2
};
AddMessage(msgUi);
}
// finalizing UI
MessageTextBox.Text = "";
MessageTextBox.Focus();
_stopLoading = true;
MainScrollViewer.ScrollToBottom();
MainScrollViewer.UpdateLayout();
_stopLoading = false;
SendButtonIcon.Kind = PackIconKind.Attachment;
SendButton.ToolTip = "Send File";
}
}
if (string.IsNullOrWhiteSpace(MessageTextBox.Text)) // show attachment icon
{
SendButtonIcon.Kind = PackIconKind.Attachment;
SendButton.ToolTip = "Send File";
}
else
{
SendButtonIcon.Kind = PackIconKind.Send;
SendButton.ToolTip = "Send Message";
}
}
private async void SendBtnClicked(object sender, RoutedEventArgs e)
{
string message = MessageTextBox.Text.Trim();
// initialize file send
if (string.IsNullOrWhiteSpace(message))
{
OpenFileDialog ofd = new OpenFileDialog {
Title = "Send File"
};
bool?result = ofd.ShowDialog();
if (result.HasValue && result.Value)
{
string key = (await SharedStuff.Database.Table <DatabaseHelper.Users>().Where(user => user.Username == Username)
.FirstAsync()).Key;
// at first request a token
string id = Guid.NewGuid().ToString();
var msgUi = new ChatMessagesNotify
{
MyMessage = true,
Message = Path.GetFileName(ofd.FileName),
FullDate = DateTime.Now,
Type = 1,
Sent = 1,
FilePath = ofd.FileName,
With = Username
};
SharedStuff.PendingMessages.Add(id, msgUi);
// create json
string json = JsonConvert.SerializeObject(new JsonTypes.SendMessage
{
Type = 2,
Id = id,
Payload = new JsonTypes.SendMessagePayload
{
To = Username,
Message = Path.GetFileName(ofd.FileName)
}
});
SharedStuff.Websocket.SendAsync(json, null);
AddMessage(msgUi);
}
}
else
{
if (SharedStuff.Websocket.IsAlive)
{
string id = Guid.NewGuid().ToString();
await Task.Run(() => SendMessage(message, id));
var msgUi = new ChatMessagesNotify
{
MyMessage = true,
Message = message,
FullDate = DateTime.Now,
Type = 0,
Sent = 1
};
AddMessage(msgUi); // add it to ui
SharedStuff.PendingMessages.Add(id, msgUi); // add message to pending messages
}
else
{
var msgUi = new ChatMessagesNotify
{
MyMessage = true,
Message = message,
FullDate = DateTime.Now,
Type = 0,
Sent = 2
};
AddMessage(msgUi);
}
// finalizing UI
MessageTextBox.Text = "";
MessageTextBox.Focus();
_stopLoading = true;
MainScrollViewer.ScrollToBottom();
MainScrollViewer.UpdateLayout();
_stopLoading = false;
SendButtonIcon.Kind = PackIconKind.Attachment;
SendButton.ToolTip = "Send File";
}
}