本项目需要对TreeView进行定制，要求比较简单，主要要求如下：
- Winform中TreeView控件默认只支持所有级别的CheckBox显示或者不显示，不能控制制定Level的树节点显示
效果如下：
效果实现代码：
(1)属性和事件设置
this.treeViewGroupStatements.CheckBoxes = true;
this.treeViewGroupStatements.DrawMode = TreeViewDrawMode.OwnerDrawAll;
this.treeViewGroupStatements.DrawNode+=new DrawTreeNodeEventHandler(treeViewGroupStatements_DrawNode);
(2)实现代码
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#region 隐藏CheckBoxs //要隐藏的TreeNode的level
public ArrayList HideLevelList = new ArrayList() { 0, 1 };
private void treeViewGroupStatements_DrawNode(object sender, DrawTreeNodeEventArgs e)
{ HideLevelOfTreeView(e.Node);
e.DrawDefault = true;
}private void HideLevelOfTreeView(TreeNode tn)
{ //控制这个条件可以自定义显示checkbox的条件
if (HideLevelList.Contains(tn.Level))
HideCheckBox(tn.TreeView, tn);
}//#endregionprivate const int TVIF_STATE = 0x8;
private const int TVIS_STATEIMAGEMASK = 0xF000;
private const int TV_FIRST = 0x1100;
private const int TVM_SETITEM = TV_FIRST + 63;
private void HideCheckBox(TreeView tvw, TreeNode node)
{ TVITEM tvi = new TVITEM();
tvi.hItem = node.Handle;
tvi.mask = TVIF_STATE;
tvi.stateMask = TVIS_STATEIMAGEMASK;
tvi.state = 0;
SendMessage(tvw.Handle, TVM_SETITEM, IntPtr.Zero, ref tvi);
}[StructLayout(LayoutKind.Sequential, Pack = 8, CharSet = CharSet.Auto)]private struct TVITEM
{ public int mask;
public IntPtr hItem;
public int state;
public int stateMask;
[MarshalAs(UnmanagedType.LPTStr)]
public string lpszText;
public int cchTextMax;
public int iImage;
public int iSelectedImage; public int cChildren; public IntPtr lParam;
}[DllImport("user32.dll", CharSet = CharSet.Auto)]
private static extern IntPtr SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, ref TVITEM lParam);
#endregion |