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本項目需要對TreeView進行定制，要求比較簡單，主要要求如下：
- Winform中TreeView控件默認只支持所有級別的CheckBox顯示或者不顯示，不能控制制定Level的樹節點顯示
效果如下：
效果實現代碼：
(1)屬性和事件設置
this.treeViewGroupStatements.CheckBoxes = true;
this.treeViewGroupStatements.DrawMode = TreeViewDrawMode.OwnerDrawAll;
this.treeViewGroupStatements.DrawNode+=new DrawTreeNodeEventHandler(treeViewGroupStatements_DrawNode);
(2)實現代碼
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#region 隱藏CheckBoxs //要隱藏的TreeNode的levelpublic 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){ //控制這個條件可以自定義顯示checkbox的條件 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 |
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