Question

Display end of text in a richtextbox

Asked by: dr_roose

Hi All,
I have this problem in several programs I am working on.

I have a richtextbox which displays text loaded from a data base.  When the form first loads the RTB displays the text starting at the beginning of the text.  I would like to be able to force the RTB to display the text at the end of the text.  Alternately I would like to select some text and have the  RTB show that text rather that the text at the beginning.

The included code runs when the RTB gains focus and selects the last 10 characters of the RTB.text but when it displays it displays not the selected text but the text at the beginning.

Any suggestions would be appreciated as it is disconcerning for a user to need to always scroll to the end to view the selected text.

Thanks
dr_roose

Private Sub RTB2_GotFocus(ByVal sender As Object, ByVal e As System.EventArgs) Handles RTB2.GotFocus
    RTB2.SelectionStart = RTB2.TextLength - 10
    RTB2.SelectionLength = 10
  End Sub

                                  
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Asked On
2009-08-19 at 20:43:16ID24667030
Tags

vb richtextbox

Topics

VB Controls

,

VB Objects

Participating Experts
1
Points
500
Comments
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Answers

 

by: Idle_MindPosted on 2009-08-19 at 21:40:58ID: 25139399

Try using the ScrollToCaret() method:
http://msdn.microsoft.com/en-us/library/system.windows.forms.textboxbase.scrolltocaret(VS.80).aspx

Something like...

        RTB2.SelectionStart = RTB2.TextLength - 10
        RTB2.SelectionLength = 10
        ' (or select something else)
        RTB2.ScrollToCaret()

                                              
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by: dr_roosePosted on 2009-08-19 at 21:49:08ID: 25139423

Hi Sage,
I added the line of code you suggested and got the following error...

System.Runtime.InteropServices.COMException was unhandled
  ErrorCode=-2147467259
  Message="Error HRESULT E_FAIL has been returned from a call to a COM component."
  Source="System.Windows.Forms"
  StackTrace:
       at System.Windows.Forms.UnsafeNativeMethods.ITextRange.ScrollIntoView(Int32 value)
       at System.Windows.Forms.TextBoxBase.ScrollToCaret()
       at Sampledb.Form1.RTB2_GotFocus(Object sender, EventArgs e) in C:\Documents and Settings\Administrator\My Documents\Visual Studio 2008\Projects\Sampledb\Sampledb\SampleDBAccess.vb:line 136
       at System.Windows.Forms.Control.OnGotFocus(EventArgs e)
       at System.Windows.Forms.Control.WmSetFocus(Message& m)
       at System.Windows.Forms.Control.WndProc(Message& m)
       at System.Windows.Forms.TextBoxBase.WndProc(Message& m)
       at System.Windows.Forms.RichTextBox.WndProc(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
       at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
       at System.Windows.Forms.UnsafeNativeMethods.CallWindowProc(IntPtr wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
       at System.Windows.Forms.NativeWindow.DefWndProc(Message& m)
       at System.Windows.Forms.Control.DefWndProc(Message& m)
       at System.Windows.Forms.Control.WmMouseDown(Message& m, MouseButtons button, Int32 clicks)
       at System.Windows.Forms.Control.WndProc(Message& m)
       at System.Windows.Forms.TextBoxBase.WndProc(Message& m)
       at System.Windows.Forms.RichTextBox.WndProc(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
       at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
       at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
       at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.Run(ApplicationContext context)
       at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun()
       at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel()
       at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(String[] commandLine)
       at Sampledb.My.MyApplication.Main(String[] Args) in 17d14f5c-a337-4978-8281-53493378c1071.vb:line 81
       at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException:
Do I need to add some reference or Inports statementto my code?  at the present time I only have one import
Imports MySql.Data.MySqlClient

Thanks
dr_roose

 

by: Idle_MindPosted on 2009-08-19 at 22:45:56ID: 25139608

Hmmm...I couldn't reproduce the error at first but after repeatedly rapidly clicking between a TextBox and the RichTextBox I finally got the same error.  Interesting one!  I think it may have something to do with using ScrollToCaret() within the GotFocus() event?...can't find any other documented errors on this one...

The way it's supposed to be used is you give the RTB focus first and then you call it.  Can you call it from a different event like Shown()?

    Private Sub Form1_Shown(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Shown
        RTB2.Focus()
        RTB2.SelectionStart = RTB2.TextLength - 10
        RTB2.SelectionLength = 10
        RTB2.ScrollToCaret()
    End Sub

 

by: dr_roosePosted on 2009-08-19 at 22:59:15ID: 31617987

Thanks a million.

20120131-EE-VQP-002

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