本文實例講述了C#實現listvIEw Group收縮擴展的方法。分享給大家供大家參考，具體如下：
1、本實例是完善了codeprofect上面charju老師“Add Group Collapse Behavior on a ListvIEw Control”的一個限制（點擊分組後面的圖標不能收縮和擴展）；
2、本實列適用於win2008,Vista；
3、僅供參考，如有更好的方法，望大家不吝交流~
完整代碼如下（只需建一個Windows工程，在窗體上拖一個listvIEw控件，取名為aoc，右擊編輯代碼，把下面的代碼粘到窗口就可以了~，但需要注意事件對應）：
? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Diagnostics;
namespace ListVIEwGroup
{
public partial class MainForm : Form
{
public MainForm()
{
InitializeComponent();
}
[DllImport("user32.dll")]
static extern int SendMessage(IntPtr window, int message, int wParam, ref LVHITTESTINFO lParam);
[DllImport("user32.dll")]
static extern int SendMessage(IntPtr window, int message, int wParam, IntPtr lParam);
private void btCollapse_Click(object sender, EventArgs e)
{
SetGroupCollapse(GroupState.COLLAPSED | GroupState.COLLAPSIBLE);
}
private void btExpand_Click(object sender, EventArgs e)
{
SetGroupCollapse(GroupState.EXPANDED | GroupState.COLLAPSIBLE);
}
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);
}
}
}
private void MainForm_Load(object sender, EventArgs e)
{
SetGroupCollapse(GroupState.COLLAPSIBLE);
for (int i = 0; i < aoc.Groups.Count; i++)
{
aoc.Groups[i].Tag = "EXPANDED";
}
}
private void aoc_MouseDown(object sender, MouseEventArgs e)
{
LVHITTESTINFO lvHitInfo = new LVHITTESTINFO();
Point p = new Point(e.X, e.Y);
lvHitInfo.pt = p;
try
{
int id = SendMessage(aoc.Handle, 0x1000 + 18, -1, ref lvHitInfo);
if (lvHitInfo.flags == 0x50000000)
{
if (aoc.Groups[id].Tag.ToString() =="EXPANDED")
{
SetGroupCollapseEx(id, GroupState.COLLAPSED | GroupState.COLLAPSIBLE);
aoc.Groups[id].Tag = "COLLAPSED";
}
else if ( aoc.Groups[id].Tag.ToString() == "COLLAPSED")
{
SetGroupCollapseEx(id, GroupState.EXPANDED | GroupState.COLLAPSIBLE);
aoc.Groups[id].Tag = "EXPANDED";
}
}
//MessageBox.Show(string.Format("RESULT={0} FLAGS=0x{1:X}", id, lvHitInfo.flags));
}
catch (Exception ex)
{
Trace.WriteLine(ex.Message + Environment.NewLine + ex.StackTrace);
}
finally
{
;
}
}
private void SetGroupCollapseEx(int id, GroupState groupState)
{
int i = id;
LVGROUP group = new LVGROUP();
group.cbSize = Marshal.SizeOf(group);
group.state = (int)groupState; // 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);
}
}
}
[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;
}
public enum GroupState
{
COLLAPSIBLE = 8,
COLLAPSED = 1,
EXPANDED = 0
}
[StructLayout(LayoutKind.Sequential)]
public struct LVHITTESTINFO
{
public Point pt;
public int flags;
public int iItem;
public int iSubItem;
public int iGroup;
}
}
