using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;
namespace System.Windows.Forms
{
public class TreeViewEx : TreeView
{
public TreeViewEx()
{
treeView1 = this;
treeView1.HotTracking = true;
treeView1.HideSelection = false;
treeView1.SelectedImageIndex = treeView1.ImageIndex;
this.treeView1.BackColor = System.Drawing.Color.White;
this.treeView1.BorderStyle = System.Windows.Forms.BorderStyle.None;
this.treeView1.Font = new System.Drawing.Font("微软雅黑", 9.7F);
this.treeView1.FullRowSelect = true;
treeView1.DrawMode = TreeViewDrawMode.OwnerDrawAll;
//treeView1.Nodes[1].Expand();
//treeView1.Nodes[5].Expand();
//treeView1.SelectedNode = treeView1.Nodes[1];
this.treeView1.DrawNode += new System.Windows.Forms.DrawTreeNodeEventHandler(this.treeView1_DrawNode);
this.treeView1.BeforeSelect += new System.Windows.Forms.TreeViewCancelEventHandler(this.treeView1_BeforeSelect);
this.treeView1.KeyDown += new System.Windows.Forms.KeyEventHandler(this.treeView1_KeyDown);
}
#region DrawNode
public ImageList arrowImageList
{
get
{
return arrowImageList1;
}
set
{
arrowImageList1 = value;
}
}
/*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);
private void treeView1_DrawNode(object sender, DrawTreeNodeEventArgs 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)
{
//TreeView有焦点的时候 画选中的节点
if (treeView1.Focused)
{
e.Graphics.FillRectangle(brush1, nodeRect);
e.Graphics.DrawRectangle(pen1, nodeRect);
/*测试 画聚焦的边框*/
//ControlPaint.DrawFocusRectangle(e.Graphics, e.Bounds, Color.Black, SystemColors.Highlight);
}
/*TreeView失去焦点的时候 */
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 + 7, 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 + 2,
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 (treeView1.ImageList != null && treeView1.ImageList.Images.Count > 0)
{
//图标大小16*16
Rectangle imagebox = new Rectangle(
e.Node.Bounds.X - 3 - 16,
e.Node.Bounds.Y + 3,
16,//IMAGELIST IMAGE WIDTH
16);//HEIGHT
int index = e.Node.ImageIndex;
string imagekey = e.Node.ImageKey;
if (imagekey != "" && treeView1.ImageList.Images.ContainsKey(imagekey))
e.Graphics.DrawImage(treeView1.ImageList.Images[imagekey], imagebox);
else
{
if (e.Node.ImageIndex < 0)
index = 0;
else if (index > treeView1.ImageList.Images.Count - 1)
index = 0;
e.Graphics.DrawImage(treeView1.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
///*测试 画所有的边框*/
//nodeRect = new Rectangle(1,
// e.Bounds.Top + 1,
// e.Bounds.Width - 3,
// e.Bounds.Height - 2);
//e.Graphics.DrawRectangle(new Pen(Color.Gray), nodeRect);
}
#endregion
private void treeView1_BeforeSelect(object sender, TreeViewCancelEventArgs 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 != "")
treeView1.SelectedNode = e.Node.PrevNode;
}
if (ArrowKeyDown)
{
if (e.Node.NextNode != null && e.Node.NextNode.Text != "")
treeView1.SelectedNode = e.Node.NextNode;
}
e.Cancel = true;
}
}
}
private void treeView1_KeyDown(object sender, KeyEventArgs e)
{
ArrowKeyUp = (e.KeyCode == Keys.Up);
if (e.KeyCode == Keys.Down)
{
Text = "Down";
}
ArrowKeyDown = (e.KeyCode == Keys.Down);
if (e.KeyCode == Keys.Up)
{
Text = "UP";
}
}
private bool ArrowKeyUp = false;
private bool ArrowKeyDown = false;
private System.Windows.Forms.ImageList arrowImageList1;
private TreeView treeView1;
}
}
