【C#TreeView控件】TreeView的扩展

Treeview控件扩展

说明：
重写了treeview。还是和以前一样，先晒效果。（加了鼠标的跟随的效果，点击区域变大，节点的图标绘制）

效果图：


以下是控件源码：

[C#] 纯文本查看 复制代码

using System;
using System.Drawing;
using System.Windows.Forms;
using Windows.Resource;

namespace Windows.Forms.Controls
{

    public partial class TreeViewEx : TreeView
    {

        Color drawTextColor = Color.FromArgb(81, 81, 81);

        public TreeViewEx()
        {
            InitializeComponent();

            this.DrawMode = TreeViewDrawMode.OwnerDrawAll;
            this.FullRowSelect = true;
            this.ItemHeight = 23;
            this.HotTracking = true;
            this.ShowLines = true;

        }

        protected override void OnDrawNode(DrawTreeNodeEventArgs e)
        {
            base.OnDrawNode(e);

            //节点背景绘制
            if (e.Node.IsSelected)
            {
                e.Graphics.DrawImage(AssemblyHelper.GetImage("Resources.tree_Selected.png"), e.Bounds);
            }
            else if ((e.State & TreeNodeStates.Hot) != 0)//|| currentMouseMoveNode == e.Node)
            {
                e.Graphics.DrawImage(AssemblyHelper.GetImage("Resources.tree_Hover.png"), e.Bounds);
            }
            else
            {
                e.Graphics.FillRectangle(Brushes.White, e.Bounds);
            }

            //节点头图标绘制
            if (e.Node.IsExpanded)
            {
                e.Graphics.DrawImage(AssemblyHelper.GetImage("Resources.tree_NodeExpend.png"), e.Node.Bounds.X - 12, e.Node.Bounds.Y + 6);
            }
            else if (e.Node.IsExpanded == false && e.Node.Nodes.Count > 0)
            {
                e.Graphics.DrawImage(AssemblyHelper.GetImage("Resources.tree_NodeCollaps.png"), e.Node.Bounds.X - 12, e.Node.Bounds.Y + 6);
            }

            //文本绘制
            using (Font foreFont = new Font(this.Font, FontStyle.Regular))
            using (Brush drawTextBrush = new SolidBrush(drawTextColor))
            {
                e.Graphics.DrawString(e.Node.Text, foreFont, drawTextBrush, e.Node.Bounds.Left + 5, e.Node.Bounds.Top + 5);
            }
        }

        protected override void OnMouseDoubleClick(MouseEventArgs e)
        {
            base.OnMouseDoubleClick(e);
            TreeNode tn = this.GetNodeAt(e.Location);
            //调整【点击测试区域】大小，包括图标
            Rectangle bounds = new Rectangle(tn.Bounds.Left - 12, tn.Bounds.Y, tn.Bounds.Width - 5, tn.Bounds.Height);
            if (tn != null && bounds.Contains(e.Location) == false)
            {
                if (tn.IsExpanded == false)
                    tn.Expand();
                else
                    tn.Collapse();
            }
        }

        protected override void OnMouseClick(MouseEventArgs e)
        {
            base.OnMouseClick(e);
            TreeNode tn = this.GetNodeAt(e.Location);
            this.SelectedNode = tn;
        }

        TreeNode currentNode = null;
        protected override void OnMouseMove(MouseEventArgs e)
        {
            base.OnMouseMove(e);
            TreeNode tn = this.GetNodeAt(e.Location);
            Graphics g = this.CreateGraphics();
            if (currentNode != tn)
            {
                //绘制当前节点的hover背景
                if (tn != null)
                    OnDrawNode(new DrawTreeNodeEventArgs(g, tn, new Rectangle(0, tn.Bounds.Y, this.Width, tn.Bounds.Height), TreeNodeStates.Hot));

                //取消之前hover的节点背景
                if (currentNode != null)
                    OnDrawNode(new DrawTreeNodeEventArgs(g, currentNode, new Rectangle(0, currentNode.Bounds.Y, this.Width, currentNode.Bounds.Height), TreeNodeStates.Default));
            }
            currentNode = tn;
            g.Dispose();
        }


        protected override void OnMouseLeave(EventArgs e)
        {
            base.OnMouseLeave(e);
            //移出控件时取消Hover背景
            if (currentNode != null)
            {
                Graphics g = this.CreateGraphics();
                OnDrawNode(new DrawTreeNodeEventArgs(g, currentNode, new Rectangle(0, currentNode.Bounds.Y, this.Width, currentNode.Bounds.Height), TreeNodeStates.Default));
            }
        }
    }
}

好评,快上传原始码案例〜康忙〜康忙

非常感谢楼主,很厉害了!

123123123123123

大佬可以发下AssemblyHelper类给我看看吗

这个相当牛，膜拜

mark一下 以备不时之需

1715577326 发表于 2016-5-5 11:59
楼主有没有源码实例？求分享一份呗。谢谢

已经线上使用了。

感谢分享，学习一下。

受益匪浅，非常感谢。

加载treeview时,第一个node会有重影!!