WinForm的TreeView实现Win7 Areo效果
新建一个继承自TreeView的控件类，代码如下：
using System;
using System.Windows.Forms;
using System.Drawing;
using System.Runtime.InteropServices;
namespace SenseTreeView
{
public class SenseTreeView : TreeView
{
#region 控件属性
//显示字体
private Font _NodeFont;
public Font NodeFont
{
get
{
return _NodeFont;
}
set
{
_NodeFont = value;
}
}
//选择TreeView TreeNode时的背景色
private Brush _BackgrountBrush;
public Brush BackgroundBrush
{
get
{
return _BackgrountBrush;
}
set
{
_BackgrountBrush = value;
}
}
//选择TreeView TreeNode时背景色的边框画笔
private Pen _BackgroundPen;
public Pen BackgroundPen
{
get
{
return _BackgroundPen;
}
set
{
_BackgroundPen = value;
}
}
//TreeView中TreeNode展开时的节点显示图标，
private Image _NodeExpandedImage;
public Image NodeExpandedImage
{
get
{
return _NodeExpandedImage;
}
set
{
_NodeExpandedImage = value;
}
}
//TreeView中TreeNode合拢时的节点显示图标
private Image _NodeCollapseImage;
public Image NodeCollapseImage
{
get
{
return _NodeCollapseImage;
}
set
{
_NodeCollapseImage = value;
}
}
//TreeView中TreeNode的节点显示图标的大小
private Size _NodeImageSize;
public Size NodeImageSize
{
get
{
return _NodeImageSize;
}
set
{
_NodeImageSize = value;
}
}
//节点显示图标离左边界的位置
private int _NodeOffset;
public int NodeOffset
{
get
{
return _NodeOffset;
}
set
{
_NodeOffset = value;
}
}
#endregion
#region 构造函数
public SenseTreeView()
{
//设置窗体Style
//this.SetStyle(ControlStyles.UserPaint, true); //支持用户重绘窗体
//this.SetStyle(ControlStyles.AllPaintingInWmPaint, true); //在内存中先绘制界面
//this.SetStyle(ControlStyles.OptimizedDoubleBuffer, true); //双缓冲，防止绘制时抖动
//this.SetStyle(ControlStyles.DoubleBuffer, true); //双缓冲，防止绘制时抖动
//this.UpdateStyles();
//不显示树形节点显示连接线
this.ShowLines = false;
//设置绘制TreeNode的模式
this.DrawMode = TreeViewDrawMode.OwnerDrawAll;
//不显示TreeNode前的“+”和“-”按钮
this.ShowPlusMinus = false;
//不支持CheckedBox
this.CheckBoxes = false;
//设置TreeNode的行高
SendMessage(this.Handle, TVM_SETITEMHEIGHT, 20, 0);
//设置默认BackgroundBrush
BackgroundBrush = new SolidBrush(Color.FromArgb(90, Color.FromArgb(205, 226, 252)));
//设置默认BackgroundPen
BackgroundPen = new Pen(Color.FromArgb(130, 249, 252), 1);
//设置默认NodeFont
NodeFont = new Font("宋体", 12, FontStyle.Regular);
//设置默认节点显示图标及Size
NodeExpandedImage = null;
NodeCollapseImage = null;
NodeImageSize = new Size(18, 18);
//设置默认节点显示图标便宜位置
NodeOffset = 5;
}
#endregion
#region 节点绘制函数
//绘制TreeView树中TreeNode
protected override void OnDrawNode(DrawTreeNodeEventArgs e)
{
TreeNode tn = e.Node as TreeNode;
if (tn == null)
{
return;
}
//设置Image绘制Rectangle
Point pt = new Point(tn.Bounds.X + NodeOffset, tn.Bounds.Y);
Rectangle rt = new Rectangle(pt, NodeImageSize);
if ((e.State & TreeNodeStates.Selected) != 0)
{
//绘制TreeNode选择后的背景框
e.Graphics.FillRectangle(BackgroundBrush, 2, tn.Bounds.Y, this.Width - 7, tn.Bounds.Height - 1);
//绘制TreeNode选择后的边框线条
e.Graphics.DrawRectangle(BackgroundPen, 1, tn.Bounds.Y, this.Width - 6, tn.Bounds.Height - 1);
}
//绘制节点图片
if (NodeExpandedImage != null && NodeCollapseImage != null)
{
if (tn.Nodes.Count != 0)
{
if (tn.IsExpanded == true)
{
e.Graphics.DrawImage(NodeExpandedImage, rt);
}
else
{
e.Graphics.DrawImage(NodeCollapseImage, rt);
}
}
rt.X += 15;
}
//绘制节点自身图片
if (e.Node.SelectedImageIndex != -1 && this.ImageList != null)
{
rt.X += 5;
e.Graphics.DrawImage(this.ImageList.Images[e.Node.SelectedImageIndex], rt);
}
//绘制节点的文本
rt.X += 20;
rt.Y += 1;
rt.Width = this.Width - rt.X;
e.Graphics.DrawString(e.Node.Text, NodeFont, Brushes.Black, rt);
}
#endregion
#region 鼠标消息响应函数
//响应鼠标按下消息
protected override void OnMouseDown(MouseEventArgs e)
{
TreeNode clickedNode = this.GetNodeAt(e.X, e.Y);
if (clickedNode != null && NodeBounds(clickedNode).Contains(e.X, e.Y))
{
this.SelectedNode = clickedNode;
}
}
//响应鼠标双击消息
protected override void OnMouseDoubleClick(MouseEventArgs e)
{
TreeNode clickedNode = this.GetNodeAt(e.X, e.Y);
if (clickedNode != null && NodeBounds(clickedNode).Contains(e.X, e.Y))
{
this.SelectedNode = clickedNode;
//判断节点的状态
if (clickedNode.Nodes.Count != 0)
{
if (clickedNode.IsExpanded)
{
clickedNode.Collapse();
}
else
{
clickedNode.Expand();
}
}
}
}
#endregion
#region 私有函数
//返回TreeView中TreeNode的整行区域
private Rectangle NodeBounds(TreeNode node)
{
// Set the return value to the normal node bounds.
Rectangle bounds = node.Bounds;
//if (node.Tag != null)
//{
// // Retrieve a Graphics object from the TreeView handle
// // and use it to calculate the display width of the tag.
// Graphics g = this.CreateGraphics();
// int tagWidth = (int)g.MeasureString(node.Tag.ToString(), NodeFont).Width + 6;
// // Adjust the node bounds using the calculated value.
// bounds.Offset(tagWidth / 2, 0);
// bounds = Rectangle.Inflate(bounds, tagWidth / 2, 0);
// g.Dispose();
//}
bounds.Width = this.Width;
return bounds;
}
#endregion
#region 引用函数
const int TV_FRIST = 0x1100;
const int TVM_SETITEMHEIGHT = TV_FRIST + 27;
[DllImport("user32.dll", CharSet = CharSet.Auto)]
private static extern IntPtr SendMessage(IntPtr hWnd, int nMsg, int wParam, int Param);
#endregion
}
}
调用代码：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using SenseTreeView.Properties;
namespace SenseTreeView
{
public partial class Form1 : Form
{
private SenseTreeView stv;
public Form1()
{
InitializeComponent();
// Create and initialize the TreeView control.
stv = new SenseTreeView();
stv.Dock = DockStyle.Left;
stv.BackColor = Color.White;
//stv.CheckBoxes = true;
stv.Width = 250;
ImageList imagelist = new ImageList();
imagelist.Images.Add(Resources._1264);
imagelist.Images.Add(Resources._1265);
imagelist.Images.Add(Resources._1268);
stv.ImageList = imagelist;
stv.NodeExpandedImage = Resources.UnSelect;
stv.NodeCollapseImage = Resources.IsSelect;
// Add nodes to the TreeView control.
for (int x = 1; x < 4; ++x)
{
// Add a root node to the TreeView control.
TreeNode node = new TreeNode("中华人民共和国");
node.SelectedImageIndex = 0;
for (int y = 1; y < 4; ++y)
{
// Add a child node to the root node.
TreeNode tn = new TreeNode("Subtask");
tn.SelectedImageIndex = 2;
node.Nodes.Add(tn);
}
stv.Nodes.Add(node);
}
stv.ExpandAll();
// Initialize the form and add the TreeView control to it.
this.Controls.Add(stv);
}
}
}
效果图：
怎么样，效果非常库吧？