模仿wind系统界面，重绘Treeview + - 号图标
一，首先需要图片 ，用于替换原有的 +-号
二、新建Tree扩展类 TreeViewEx继承TreeView
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms; /*******************************************************************
* Copyright (C) 版权所有
* 文件名称:TreeViewEx
* 命名空间:TestRecentMenu
* 创建时间:2018/12/18 16:49:08
* 作 者: wangyonglai
* 描 述：
* 修改记录:
* 修改人:
* 版 本 号:v1.0.0
**********************************************************************/
namespace TestRecentMenu
{
public class TreeViewEx : TreeView
{
private bool ArrowKeyUp = false;
private bool ArrowKeyDown = false;
private System.Windows.Forms.ImageList arrowImageList1; /*1节点被选中 ,TreeView有焦点*/
private SolidBrush brush1 = new SolidBrush(Color.FromArgb(209, 232, 255));//填充颜色
private Pen pen1 = new Pen(Color.FromArgb(102, 167, 232), 1);//边框颜色 /*2节点被选中 ,TreeView没有焦点*/
private SolidBrush brush2 = new SolidBrush(Color.FromArgb(247, 247, 247));
private Pen pen2 = new Pen(Color.FromArgb(222, 222, 222), 1); /*3 MouseMove的时候 画光标所在的节点的背景*/
private SolidBrush brush3 = new SolidBrush(Color.FromArgb(229, 243, 251));
private Pen pen3 = new Pen(Color.FromArgb(112, 192, 231), 1); public const int WM_PRINTCLIENT = 0x0318;
public const int PRF_CLIENT = 0x00000004; //替换+-号图标的imagelist
public ImageList arrowImageList
{
get
{
return arrowImageList1;
}
set
{
arrowImageList1 = value;
}
} public TreeViewEx()
{
//双缓存防止屏幕抖动
//this.SetStyle(ControlStyles.UserPaint, true);
this.SetStyle(ControlStyles.OptimizedDoubleBuffer | ControlStyles.AllPaintingInWmPaint | ControlStyles.DoubleBuffer, true);
this.UpdateStyles();
this.DrawMode = TreeViewDrawMode.OwnerDrawAll;
this.FullRowSelect = true;
this.HotTracking = true;
this.HideSelection = false;
this.ShowLines = false;
this.ShowNodeToolTips = true;
this.ItemHeight = 20; } protected override void OnDrawNode(DrawTreeNodeEventArgs e)
{
base.OnDrawNode(e); #region 1 选中的节点背景=========================================
Rectangle nodeRect = new Rectangle(1, e.Bounds.Top, e.Bounds.Width - 3, e.Bounds.Height - 1); if (e.Node.IsSelected)
{
if (this.Focused)
{
e.Graphics.FillRectangle(brush1, nodeRect);
e.Graphics.DrawRectangle(pen1, nodeRect);
}
else
{
e.Graphics.FillRectangle(brush2, nodeRect);
e.Graphics.DrawRectangle(pen2, nodeRect);
} }
else if ((e.State & TreeNodeStates.Hot) != 0 && e.Node.Text != "")//|| currentMouseMoveNode == e.Node)
{
e.Graphics.FillRectangle(brush3, nodeRect);
e.Graphics.DrawRectangle(pen3, nodeRect);
}
else
{
e.Graphics.FillRectangle(Brushes.White, e.Bounds);
} #endregion #region 2 +-号绘制=========================================
Rectangle plusRect = new Rectangle(e.Node.Bounds.Left - 32, nodeRect.Top + 6, 9, 9); // +-号的大小 是9 * 9 if (e.Node.IsExpanded)
e.Graphics.DrawImage(arrowImageList.Images[1], plusRect);
else if (e.Node.IsExpanded == false && e.Node.Nodes.Count > 0)
e.Graphics.DrawImage(arrowImageList.Images[0], plusRect); /*测试用 画出+-号出现的矩形*/
//if (e.Node.Nodes.Count > 0)
// e.Graphics.DrawRectangle(new Pen(Color.Red), plusRect);
#endregion #region 3 画节点文本=========================================
Rectangle nodeTextRect = new Rectangle(
e.Node.Bounds.Left,
e.Node.Bounds.Top + 4,
e.Node.Bounds.Width + 2,
e.Node.Bounds.Height
);
nodeTextRect.Width += 4;
nodeTextRect.Height -= 4; e.Graphics.DrawString(e.Node.Text,
e.Node.TreeView.Font,
new SolidBrush(Color.Black),
nodeTextRect); //画子节点个数 (111)
if (e.Node.GetNodeCount(true) > 0)
{
e.Graphics.DrawString(string.Format("({0})", e.Node.GetNodeCount(true)),
new Font("Arial", 8),
Brushes.Gray,
nodeTextRect.Right - 4,
nodeTextRect.Top -2);
} ///*测试用，画文字出现的矩形*/
//if (e.Node.Text != "")
// e.Graphics.DrawRectangle(new Pen(Color.Blue), nodeTextRect);
#endregion #region 4 画IImageList 中的图标=================================================================== int currt_X = e.Node.Bounds.X;
if (this.ImageList != null && this.ImageList.Images.Count > 0)
{
//图标大小16*16
Rectangle imagebox = new Rectangle(
e.Node.Bounds.X - 3 - 16,
e.Node.Bounds.Y + 2,
16,//IMAGELIST IMAGE WIDTH
16);//HEIGHT int index = e.Node.ImageIndex;
string imagekey = e.Node.ImageKey;
if (imagekey != "" && this.ImageList.Images.ContainsKey(imagekey))
e.Graphics.DrawImage(this.ImageList.Images[imagekey], imagebox);
else
{
if (e.Node.ImageIndex < 0)
index = 0;
else if (index > this.ImageList.Images.Count - 1)
index = 0;
e.Graphics.DrawImage(this.ImageList.Images[index], imagebox);
}
currt_X -= 19; /*测试 画IMAGELIST的矩形*/
//if (e.Node.ImageIndex > 0)
// e.Graphics.DrawRectangle(new Pen(Color.Black, 1), imagebox);
}
#endregion
} protected override void OnBeforeSelect(TreeViewCancelEventArgs e)
{
base.OnBeforeSelect(e);
if (e.Node != null)
{
//禁止选中空白项
if (e.Node.Text == "")
{
//响应上下键
if (ArrowKeyUp)
{
if (e.Node.PrevNode != null && e.Node.PrevNode.Text != "")
this.SelectedNode = e.Node.PrevNode;
} if (ArrowKeyDown)
{
if (e.Node.NextNode != null && e.Node.NextNode.Text != "")
this.SelectedNode = e.Node.NextNode;
} e.Cancel = true;
}
}
} /// <summary>
/// 防止在选择设，treeNode闪屏
/// </summary>
protected override CreateParams CreateParams
{
get
{
CreateParams cp = base.CreateParams;
if (!DesignMode)
{
cp.ExStyle |= 0x02000000;// Turn on WS_EX_COMPOSITED
}
return cp; }
}
}
}
生成后拖动控件到界面中，实际效果如下