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Add Group Collapse Behavior on a Listview Control

, 26 Nov 2008
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Group collapse behavior added to a listview control under Windows Vista

Introduction

ListView control is an important but complex control in the WinForm environment. Group behavior is added into this control, but unfortunately, we can't collapse or expand the group.

I'll show how to use some simple code to add collapse/expand behavior on the ListView control.

This is a sample image on Windows Vista and Windows Server 2008:

lvnormal.jpg

Default group without Collapse/Expand behavior

lvgroup.jpg

Group with Collapse/Expand behavior

Using the Code

  • Define ListView group struct wrapper:

    [StructLayout(LayoutKind.Sequential)] 
    public struct LVGROUP 
    { 
            public int cbSize; 
            public int mask; 
            [MarshalAs(UnmanagedType.LPTStr)] 
            public string pszHeader; 
            public int cchHeader; 
            [MarshalAs(UnmanagedType.LPTStr)] 
            public string pszFooter; 
            public int cchFooter; 
            public int iGroupId; 
            public int stateMask; 
            public int state; 
            public int uAlign; 
    } 
  • Define the ENUM data:

    public enum GroupState 
    { 
            COLLAPSIBLE = 8, 
            COLLAPSED = 1, 
            EXPANDED = 0 
    } 
  • Interop for SendMessage function:

    [DllImport("user32.dll")] 
    static extern int SendMessage
    	(IntPtr window, int message, int wParam, IntPtr lParam);
  • Kernel method to set collapse/expand behavior on the ListView group:

    private void SetGroupCollapse(GroupState state)
    {
            for (int i = 0; i <= aoc.Groups.Count; i++){
                    LVGROUP group = new LVGROUP();
                    group.cbSize = Marshal.SizeOf(group);
                    group.state = (int)state; // LVGS_COLLAPSIBLE 
                    group.mask = 4; // LVGF_STATE 
                    group.iGroupId = i;
                    IntPtr ip = IntPtr.Zero;
                    try{
                            ip = Marshal.AllocHGlobal(group.cbSize);
                            Marshal.StructureToPtr(group, ip, true);
                            SendMessage(aoc.Handle, 0x1000 + 147, i, ip); // #define
                            LVM_SETGROUPINFO (LVM_FIRST + 147) 
                    }
                    catch (Exception ex){
                            System.Diagnostics.Trace.WriteLine
    			(ex.Message + Environment.NewLine + ex.StackTrace);
                    }
                    finally{
                            if (null != ip) Marshal.FreeHGlobal(ip);
                    }
           }
    } 

Points of Interest

#define LVM_SETGROUPINFO (LVM_FIRST + 147)
#define ListView_SetGroupInfo(hwnd, iGroupId, pgrp) \
SNDMSG((hwnd), LVM_SETGROUPINFO, (WPARAM)(iGroupId), (LPARAM)(pgrp)) 

The above is the definition from SDK file: commctrl.h.

Limitations

  • In the current version, the rightmost collapse/expand icon doesn't work. Frown | :(
  • The collapse/expand behavior only exist in Windows Vista and Win2k8 systems.

History

  • 27th November, 2008: Initial post

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Charles Ju
Software Developer
China China
I love C#.
I love using windbg to help customers solve the performance issues.

Comments and Discussions

 
BugThere is a bug... PinmemberMikro_12317-Dec-13 21:47 
QuestionFixing click on collapse icon / Make it run on 32bit PinmemberΡac-Μan23-Sep-12 5:58 
AnswerRe: Fixing click on collapse icon / Make it run on 32bit PinmemberAndira Muttakim29-Dec-12 4:57 
GeneralRe: Fixing click on collapse icon / Make it run on 32bit PinmemberPacMani27-Jan-13 6:38 
AnswerRe: Fixing click on collapse icon / Make it run on 32bit PinmemberFlanter30-May-13 15:38 
GeneralRe: Fixing click on collapse icon / Make it run on 32bit PinmemberDebugErr16-Jul-14 9:49 
QuestionButton from the group bar PinmemberMember 865897530-Jul-12 21:33 
QuestionCollapse/Expand is not working when you open the MainForm from another Form Pinmembermsiddu30-Jul-12 19:23 
AnswerRe: Collapse/Expand is not working when you open the MainForm from another Form PinmemberMikro_12317-Dec-13 22:00 
QuestionDoesn't work Pinmemberheavylifting18-May-12 8:13 
I downloaded the source code, Win 7, executed the project without changing anything and it throws an exception at the Marshl.StructureToPtr()
AnswerRe: Doesn't work Pinmemberheavylifting18-May-12 8:16 
GeneralRepaint problem on Vista/Win7 [modified] PinmemberZhuJinYong26-May-11 18:01 
GeneralMy vote of 5 PinmemberChewsHumans21-Oct-10 11:48 
GeneralMy vote of 3 Pinmembero.olll12-Aug-10 20:36 
GeneralCorrections Pinmemberimess18-Jan-10 10:35 
GeneralRe: Corrections PinmemberMember 235497011-Feb-10 5:58 
GeneralMy vote of 1 Pinmemberts2224-Jul-09 10:25 
GeneralRe: My vote of 1 PinmemberScott Dorman15-Sep-09 5:26 
Generalgetting and setting the correct Group Id PinmemberPaw Jershauge18-May-09 20:37 
QuestionHow to do in VB.Net? PinmemberJimmy Bobby29-Apr-09 14:02 
AnswerRe: How to do in VB.Net? PinmemberPaw Jershauge13-May-09 22:52 
QuestionHow to make the click on the group arrow collapse the group... Pinmemberfmaeseele21-Jan-09 7:21 
AnswerRe: How to make the click on the group arrow collapse the group... Pinmemberrantinori2-May-09 15:54 
GeneralRe: How to make the click on the group arrow collapse the group... Pinmemberlewisv2-Jul-09 4:45 
GeneralRe: How to make the click on the group arrow collapse the group... Pinmemberrantinori2-Jul-09 9:20 
GeneralRe: How to make the click on the group arrow collapse the group... Pinmembermcarmonar835-Nov-09 21:24 
GeneralRe: How to make the click on the group arrow collapse the group... Pinmemberrantinori6-Nov-09 7:28 
AnswerRe: How to make the click on the group arrow collapse the group... PinmemberZhuJinYong25-Jul-11 23:39 
Generalnot working under xp, VS 2005 Pinmemberzgelic9-Jan-09 11:40 
GeneralRe: not working under xp, VS 2005 PinmemberPaw Jershauge14-May-09 0:33 
GeneralI hadn't test the code under Windows XP or win2k Pinmembercharju27-Nov-08 15:00 
GeneralRe: I hadn't test the code under Windows XP or win2k Pinmembersroche26-Jan-09 4:17 
GeneralSource Code... PinmemberPaw Jershauge26-Nov-08 21:47 
GeneralRe: Source Code... Pinmembercharju26-Nov-08 22:53 
GeneralRe: Source Code... PinmemberPaw Jershauge27-Nov-08 0:09 

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