Solved

Treeview - Hiding Horizontal Scrollbar

Posted on 2006-07-13
5
2,081 Views
Last Modified: 2008-03-03
I have a treeview which nodes are added and deleted every so often and the horizontal position of scroll bar changes.

Is there a way i can fix the horizontal scrollbar to one position
 - or -
Get rid of it entirely?  

Either one of these solutions would be acceptable.
0
Comment
Question by:collages
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
5 Comments
 
LVL 11

Expert Comment

by:vo1d
ID: 17101861
do you use beginupdate() endupdate method before and after your add cycle?
0
 
LVL 1

Author Comment

by:collages
ID: 17102893
Yes i do.
0
 
LVL 11

Accepted Solution

by:
vo1d earned 500 total points
ID: 17103504
ok, then you can disable the scrollbar by using the win32 api function  ShowScrollBar.

derive from treeview and implement this:

// Win32 Constants
private const int SB_HORZ = 0;
private const int SB_VERT = 1;
private const int SB_CTL  = 2;
private const int SB_BOTH = 3;

// Win32 Functions
[DllImport("user32.dll")]
private static extern int ShowScrollBar(IntPtr hWnd, int wBar, int bShow);

protected override void WndProc(ref Message m)
{
    switch(m.Msg)
    {
        //
        // ...
        //

        case WM_NCCALCSIZE:
            ShowScrollBar(m.HWnd, SB_CTL, 0);
            break;
    }

    base.WndProc(ref m);
}

if you are adding your nodes, set a flag which indicates it.
then in WM_NCCALCSIZE, check for that flag, if true, make
ShowScrollBar(m.HWnd, SB_CTL, 0);
otherwise,
ShowScrollBar(m.HWnd, SB_CTL, 1);

0
 
LVL 11

Expert Comment

by:vo1d
ID: 17103604
here is a tree which works. you will just have to implement the flag i mentioned:

public class CustomTreeView : TreeView
        {
            private const int WM_NCCALCSIZE = 0x0083;
            private const int SB_HORZ       = 0;
            private const int SB_VERT       = 1;
            private const int SB_CTL        = 2;
            private const int SB_BOTH       = 3;
       
            [DllImport("user32.dll")]
            private static extern int ShowScrollBar(IntPtr hWnd, int wBar, int bShow);
           
            public CustomTreeView() : base()
            {
           
            }
           
            protected override void WndProc(ref Message m)
            {
                switch(m.Msg)
                {
                    case WM_NCCALCSIZE:
                        ShowScrollBar(base.Handle, SB_BOTH, 0);
                        break;
                }
                base.WndProc(ref m);
            }            
        }
0
 
LVL 1

Author Comment

by:collages
ID: 17109690
Perfect.
0

Featured Post

What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction Although it is an old technology, serial ports are still being used by many hardware manufacturers. If you develop applications in C#, Microsoft .NET framework has SerialPort class to communicate with the serial ports.  I needed to…
This article introduced a TextBox that supports transparent background.   Introduction TextBox is the most widely used control component in GUI design. Most GUI controls do not support transparent background and more or less do not have the…
In this video, viewers will be given step by step instructions on adjusting mouse, pointer and cursor visibility in Microsoft Windows 10. The video seeks to educate those who are struggling with the new Windows 10 Graphical User Interface. Change Cu…
Monitoring a network: how to monitor network services and why? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the philosophy behind service monitoring and why a handshake validation is critical in network monitoring. Software utilized …

634 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