Make the scrolling stop ...

[Eli_1]

How can I add colored text to a RichTextBox control, while stopping it from scrolling?

I've done it using SendMessage and .Text, but that was ghetto and had a few problems:
1) I couldn't add colored text.
2) 8:10 users of the program would have seizures due to the horrible flickering.

Thanks in advance...

[MyndFyre]

How can I add colored text to a RichTextBox control, while stopping it from scrolling?

I've done it using SendMessage and .Text, but that was ghetto and had a few problems:
1) I couldn't add colored text.
2) 8:10 users of the program would have seizures due to the horrible flickering.

Thanks in advance...

What are you trying to do, exactly?  How is your Add-Text function set up?

[Eli_1]

There is no addtext function set up currently.

Here's a simple one I use sometimes:

Code Select Expand


Public sub AddText(atoutput as richtextbox, byval data as string, color as colorconstants)
   with atoutput
       .selstart = len(.text)
       .selcolor = color
       .seltext = data
       .selstart = len(.text)
   end with
end sub


My question wasn't very clear, I'm realizing. It's for a simple chat bot, where text is constantly being added to the textbox.

But say someone says something funny like, "I like poopie", and I want to quote it. I have to scroll up and copy and paste it. But say he says something else while I'm trying to copy it, I'll be scrolled to the bottom again, because of .SelStart.

This is what I'm trying to get around...

[hismajesty]

2) 8:10 users of the program would have seizures due to the horrible flickering.

Use LockWindowUpdate to stop the flickering.

Code Select Expand

Public Declare Function LockWindowUpdate Lib "user32" (ByVal hwnd As Long) As Long

[Eli_1]

While that would work, the way I made it work would mean no colors -- a very boring chat bot.

[Stwong]

Write the entire textbox yourself using the windows gdi and backbuffers so it wont flicker?

This advice is probably thoroughly unhelpful, but there are gdi tutorials on google

[Grok]

Write the entire textbox yourself using the windows gdi and backbuffers so it wont flicker?

This advice is probably thoroughly unhelpful, but there are gdi tutorials on google

A good idea several of us have considered for years, but nobody has even started.  We wanted to write a Starcraft-styled ListBox as a COM control in an ActiveX DLL, then distribute so VB programmers would have a better choice than a RichEdit control (RichTextBox) from which to start their bots.

[CrAz3D]

Write the entire textbox yourself using the windows gdi and backbuffers so it wont flicker?

This advice is probably thoroughly unhelpful, but there are gdi tutorials on google

A good idea several of us have considered for years, but nobody has even started.  We wanted to write a Starcraft-styled ListBox as a COM control in an ActiveX DLL, then distribute so VB programmers would have a better choice than a RichEdit control (RichTextBox) from which to start their bots.

What would a StarCraft styled listbox be?

[Adron]

A good idea several of us have considered for years, but nobody has even started.  We wanted to write a Starcraft-styled ListBox as a COM control in an ActiveX DLL, then distribute so VB programmers would have a better choice than a RichEdit control (RichTextBox) from which to start their bots.

A Starcraft-styled ListBox is suboptimal because that ListBox doesn't support selecting and copying text. It might be better to just write the whole thing from scratch.

[iago]

* iago points to javax.swing.JTextPane

oops! :-)

[MyndFyre]

A good idea several of us have considered for years, but nobody has even started.  We wanted to write a Starcraft-styled ListBox as a COM control in an ActiveX DLL, then distribute so VB programmers would have a better choice than a RichEdit control (RichTextBox) from which to start their bots.

A Starcraft-styled ListBox is suboptimal because that ListBox doesn't support selecting and copying text. It might be better to just write the whole thing from scratch.

I'm using a managed wrapper of the MSHTML DHTML editor control.  I haven't built in the logic for it to not scroll, and honestly, I've only thought about it a little.  But look how easy it is:

Code Select Expand


void AddChatEvent(ChatEvent ce) {
 // this loop ensures that only 100 events are displayed at a time.
 // eventQueue is a Queue object (wow!) that stores the last 100 chat events (wow!)
 while (eventQueue.Count >= 100) {
   ChatEvent removing = eventQueue.Pop() as ChatEvent;
   // sbText is a StringBuilder object, for mutable, buffered strings
   // it holds the entire HTML that should be displayed
   // Instance method ChatEvent.ToString() converts the chat event into HTML text based on the event type
   // and data.
   sbText.Remove(removing.ToString()); // that takes the oldest chat event out.
 }

 // now we append the new event.
 sbText.Append(ce.ToString());

 // find the element
 // he is the wrapped control, for HtmlEditor.  HtmlEditor.Document is a wrapper for the IHTMLDocument,
 // IHTMLDocument2, IHTMLDocument3, IHTMLDocument4, IHTMLDocument5, and IHTMLDocument6 COM
 // interfaces.
 // To use these, you have to reference the interop assembly Microsoft.mshtml.dll
 IHTMLElement element = he.Document.getElementById("armabot_textinsert");
 element.innerHTML = sbText.ToString();

 // now if I want to scroll it, I find the element that I just inserted by its ID which is uniquely generated by the
 // ChatEvent class.
 IHTMLElement newElement = he.Document.getElementById(ce.Identifier);
 newElement.scrollIntoView(1 as object);
}


The HTML code that ChatEvent.ToString() emits is something like the following:

Code Select Expand


<span id="CE10352"><div class="time">[1.32.55 pm]</div> <div class="username">MyndFyre:</div> <div class="ChatText">Blah blah blah</div></span>


The nice thing is that the HTML box also allows me to copy as plaintext or HTML:

[1.25.23 pm] MyndFyre whispers: Instance ban is currently disabled.
[1.29.47 pm] Slackware joined the channel with Warcraft II: Battle.net Edition.
[1.29.49 pm] e1-: I have designated Slackware
[1.38.49 pm] R.a.B.B.i.T[e1] has left the channel.

Code Select Expand


<SPAN id=eid48><SPAN class=time>[1.25.23 pm]</SPAN> <SPAN
class=whispername>MyndFyre whispers:</SPAN> <SPAN class=whisper>Instance ban is
currently disabled.</SPAN></SPAN><BR><SPAN id=eid49><SPAN class=time>[1.29.47
pm]</SPAN> <SPAN class=userjoin>Slackware joined the channel with Warcraft II:
Battle.net Edition.</SPAN></SPAN><BR><SPAN id=eid50><SPAN class=time>[1.29.49
pm]</SPAN> <SPAN class=moderatorname>e1-:</SPAN> <SPAN class=ChatText>I have
designated Slackware</SPAN></SPAN><BR><SPAN id=eid51><SPAN class=time>[1.38.49
pm]</SPAN> <SPAN class=userleft>R.a.B.B.i.T[e1] has left the
channel.</SPAN></SPAN>


MSHTML HTML isn't exactly pretty, but it gets the job done

Anyway, that's what I use.  If you're up for a little bit of a learning curve, MSHTML IMHO is worth it.

[Adron]

That looks nice. Adding text doesn't affect current cursor location, scroll position or similar? Can you type into it too, if you don't make it read-only?

[MyndFyre]

That looks nice. Adding text doesn't affect current cursor location, scroll position or similar? Can you type into it too, if you don't make it read-only?

If you don't use the scrollIntoView, then no, it won't affect scroll position.  There's a way to make it editable as well, although I'm not familiar with all of the mechanics behind it (I'd have to look at the source, which I have available, but am not familiar with).  Cursor location is probably the same way.

[Dyndrilliac]

Eh, Why couldn't you just write a function that locks the chat temporarily, and during that time, filter all messages recieved into a queue type mechanism - then once chat is unlocked, have the queue attractively unload the messages it recieved onto the RTB and continue program flow normally?

Edit: Here's Something I wrote quickly.

Code Select Expand

Public Type FQueue
   Username As String
   Flags As Long
   Message As String
   Ping As Long
End Type

Public MQueue() As FQueue
Public QMax As Integer

Public Sub InitializeFQueue()
   QMax = 100
   ReDim MQueue(QMax)
End Sub

Public Function AddMQ(Username As String, Flags As Long, Message As String, Ping As Long)
   On Error GoTo ErrHandle
   Dim i As Integer
Retry:
   i = 0
   Do Until MQueue(i).Message = vbNullString
       i = i + 1
   Loop
   MQueue(i).Username = Username
   MQueue(i).Flags = Flags
   MQueue(i).Message = Message
   MQueue(i).Ping = Ping
   Exit Function
ErrHandle:
   ReDim Preserve MQueue(QMax)
   GoTo Retry
End Function

Then, when you have the OnTalk event and the chat is locked, do something like...:

Code Select Expand

Public Locked As Boolean
Public LockTimer As Timer

Public Sub LockTimer_Timer()

   Dim i As Integer
   For i = 0 To MQueue(QMax)
       If MQueue(i).Username = vbNullString Then
           Exit Sub
       End If
       AddC frmMain.Chat, vbGreen, "<" & Mqueue(i).Username &.......<you get the picture>...
   Next i
   
   InitializeFQueue

End Sub

Public Sub OnTalk(Username As String, Flags As Long, Message As String, Ping As Long)

Dim QInterval As Integer

If Locked = True Then
   AddMQ Username, Flags, Message, Ping
   LockTimer.Enabled = True
   LockTimer.Interval = QInterval
End If

End Sub

Note: The above is untested, but for the most part it looks right.

[UserLoser.]

A good idea several of us have considered for years, but nobody has even started.  We wanted to write a Starcraft-styled ListBox as a COM control in an ActiveX DLL, then distribute so VB programmers would have a better choice than a RichEdit control (RichTextBox) from which to start their bots.

Sounds like a good idea, maybe I can take a shot at this..