Solved

vscroll

Posted on 1998-05-25
5
452 Views
Last Modified: 2011-10-03
I need a complete and detailed  working example of code for verticle scrolling of a text box. I am using vb4-16bit
0
Comment
Question by:hjaycox
  • 3
  • 2
5 Comments
 

Author Comment

by:hjaycox
Comment Utility
Edited text of question
0
 
LVL 5

Accepted Solution

by:
bin_huwairib earned 600 total points
Comment Utility
hjaycox,

[1] To scroll a text box automatically:
Set the MultiLine property to True and the ScrollBars property to Vertical (2).

[2] To scroll text box programmatically, check the following example:

1. From the File menu, choose New Project (press ALT, F, N).
2. Double-click Form1 to bring up the code window.
3. Add the following API declaration to the General Declarations
section of Form1:
 
Declare Function PutFocus% Lib "user" Alias "SetFocus" (ByVal
                                                           hWd%)
Declare Function SendMessage& Lib "user" (ByVal hWd%,
                                          ByVal wMsg%,
                                          ByVal wParam%,
                                          ByVal lParam&)
 
4. Create a text box called Text1 on Form1. Set the MultiLine property to True and the ScrollBars property to Horizontal (1).
5. Create a command button called Command1 and change the Caption to "Vertical".
6. Create another command button called Command2 and change the Caption to "Horizontal".
7. From the General Declarations section of Form1, create a procedure to initialize some text in the text box as follows:
 
Sub InitializeTextBox ()
Text1.Text = ""
For i% = 1 To 50
 Text1.Text = Text1.Text + "This is line " + Str$(i%)
 For j% = 1 to 10
  Text1.Text = Text1.Text + " Word "+ Str$(j%)
 Next j%
    Text1.Text = Text1.Text + Chr$(13) + Chr$(10)
   x% = DoEvents()
Next i%
End Sub
 
8. Add the following code to the load event procedure of Form1:
 
Sub Form_Load ()
 Call InitializeTextBox
End Sub
 
9. Create the actual scroll procedure within the General Declarations section of Form1 as follows:
 
Function ScrollText& (TextBox As Control, vLines As Integer, hLines As Integer)

Const EM_LINESCROLL = &H406
Lines& = Clng(&H10000 * hLines) + vLines
SavedWnd%  = Screen.ActiveControl.Hwnd
TextBox.SetFocus
Success& = SendMessage(TextBox.HWnd, EM_LINESCROLL, 0, Lines&)
r% = PutFocus% (SavedWnd%)
ScrollText& = Success&
 
End Function

10. Add the following code to the click event procedure of Command1 labeled "Vertical":
 
Sub Command1_Click ()
 Num& = ScrollText&(Text1, 5, 0)
End Sub
 
11.  Add the following code to the click event procedure of Command2 labeled "Horizontal":
 
Sub Command2_Click ()
 Num& = ScrollText&(Text1, 0, 5)
End Sub


Best regards
Bin Huwairib
0
 

Author Comment

by:hjaycox
Comment Utility
hjaycox,

1- Add Private keyword before the declaration:

 Private Declare Function PutFocus% Lib...
 Private Declare Function SendMessage& Lib...

2- You mess type the function, its not CHNG its CLNG (clng) and its a function in VB.

3- The loop in InitializeTEXTBOX() sub is for testing perpose, so you can remove it and put your code there. Example:

Sub InitializeTextBox()
 Dim MyParag as String
 
 MyParag = "Line No.1" & Chr(13) & Chr(10)
 MyParag = MyParag + "Line No.2" + Chr(13) + Chr(10)
 ..
 ..
 MyParag = MyParag + "Line No.30"
 Text1.Text = MyParag
End Sub

Bin Huwairib
0
 
LVL 5

Expert Comment

by:bin_huwairib
Comment Utility
thanks have another 100 on me
0
 

Author Comment

by:hjaycox
Comment Utility
excellent ...thank you
0

Featured Post

Top 6 Sources for Identifying Threat Actor TTPs

Understanding your enemy is essential. These six sources will help you identify the most popular threat actor tactics, techniques, and procedures (TTPs).

Join & Write a Comment

If you have ever used Microsoft Word then you know that it has a good spell checker and it may have occurred to you that the ability to check spelling might be a nice piece of functionality to add to certain applications of yours. Well the code that…
You can of course define an array to hold data that is of a particular type like an array of Strings to hold customer names or an array of Doubles to hold customer sales, but what do you do if you want to coordinate that data? This article describes…
As developers, we are not limited to the functions provided by the VBA language. In addition, we can call the functions that are part of the Windows operating system. These functions are part of the Windows API (Application Programming Interface). U…
Get people started with the process of using Access VBA to control Outlook using automation, Microsoft Access can control other applications. An example is the ability to programmatically talk to Microsoft Outlook. Using automation, an Access applic…

762 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

10 Experts available now in Live!

Get 1:1 Help Now