自定义绘制treeview,重绘treeview

基于treeview，实现类似windows常见任务的功能。无法上传图片，所以无给大家看效果

using System;using System.Collections.Generic;using System.Text;using System.ComponentModel;using System.Diagnostics;using System.Windows.Forms;using System.Drawing;using System.Drawing.Drawing2D;namespace XoExpress.SeControl{ /// <summary> /// 基于树视图的任务控件 /// </summary> public class CTreeTaskBox:TreeView { #region //construckor /// <summary> /// /// </summary> public CTreeTaskBox() { FullRowSelect = true; ShowLines = false; this.SetStyle(ControlStyles.OptimizedDoubleBuffer , true); this.DrawMode = TreeViewDrawMode.OwnerDrawAll; this.ItemHeight = 20; this.ShowLines = true; } #endregion #region //field & property /// <summary> /// 展开按扭的大小 /// </summary> private Size ExpandButtonSize = new Size(16, 16); private Color _ExpandButtonColor = Color.FromArgb(255,255,255); /// <summary> /// 展开按扭颜色 /// </summary> [Description("展开按扭颜色"), Category("XOProperty")] public Color ExpandButtonColor { get { return _ExpandButtonColor; } set { if (_ExpandButtonColor != value) { _ExpandButtonColor = value; this.Invalidate(); } } } private Color _GroupBgColor = Color.FromArgb(95,162,211); /// <summary> /// 分组栏背景色 /// </summary> [Description("分组栏背景色"), Category("XOProperty")] public Color GroupBgColor { get { return _GroupBgColor; } set { if (_GroupBgColor != value) { _GroupBgColor = value; this.Invalidate(); } } } private Color _GroupTitleColor = Color.FromArgb(0, 0, 0); /// <summary> /// 分组栏标题色 /// </summary> [Description("分组栏标题色"), Category("XOProperty")] public Color GroupTitleColor { get { return _GroupTitleColor; } set { if (_GroupTitleColor != value) { _GroupTitleColor = value; this.Invalidate(); } } } private Color _OverForeColor = Color.LightBlue; /// <summary> /// 鼠标悬停色 /// </summary> [Description("鼠标悬停色"), Category("XOProperty")] public Color OverForeColor { get { return _OverForeColor; } set { if (_OverForeColor != value) { _OverForeColor = value; this.Invalidate(); } } } /// <summary> /// 节点高度 /// </summary> public new int ItemHeight { get { return base.ItemHeight; } set { if (base.ItemHeight != value && value>=20) { base.ItemHeight = value; this.Invalidate(); } } } #endregion #region //override protected override void OnDrawNode(DrawTreeNodeEventArgs e) { //base.OnDrawNode(e); DrawNodeItem(e); } protected override void WndProc(ref Message m) { if (m.Msg == 0x0201)//单击 { int wparam = m.LParam.ToInt32(); Point point = new Point( LOWORD(wparam), HIWORD(wparam)); //point = PointToClient(point); TreeNode tn = this.GetNodeAt(point); if (tn == null) { base.WndProc(ref m); return; } if (tn.Level == 0) { if (tn.IsExpanded) { tn.Collapse(); } else { tn.Expand(); } m.Result = IntPtr.Zero;return; } else { base.WndProc(ref m); //tn.IsSelected = true; //this.SelectedNode = tn; } } else if (m.Msg == 0x0203)//双击 { int wparam = m.LParam.ToInt32(); Point point = new Point( LOWORD(wparam), HIWORD(wparam)); //point = PointToClient(point); TreeNode tn = this.GetNodeAt(point); if (tn == null) { base.WndProc(ref m); return; } if (tn.Level == 0) { m.Result = IntPtr.Zero;return; } else { base.WndProc(ref m); } } else if (m.Msg == 0x0200)//鼠标移动 { try { int wparam = m.LParam.ToInt32(); Point point = new Point( LOWORD(wparam), HIWORD(wparam)); //point = PointToClient(point); TreeNode tn = this.GetNodeAt(point); if (tn == null) { this.SelectedNode = null; base.WndProc(ref m); return; } this.SelectedNode = tn; } catch { } } else if (m.Msg == 0x02A3)//鼠标移出 WM_MOUSELEAVE = $02A3; { this.SelectedNode = null; base.WndProc(ref m); return; } else { base.WndProc(ref m); } //WM_LBUTTONDOWN = $0201 //WM_LBUTTONDBLCLK = $0203; } #endregion #region //private method /// <summary> /// 自定义绘制节点 /// </summary> /// <param name="e"></param> private void DrawNodeItem(DrawTreeNodeEventArgs e) { TreeNode tn = e.Node; if (tn.Level == 0) { using (Graphics g = e.Graphics) { //绘制分组的背景 RenderBackgroundInternalRate(g, e.Bounds, GroupBgColor, GroupBgColor, Color.FromArgb(200, 255, 255, 255), 0.45f, true, 300); //绘制展开按扭 g.FillEllipse(new SolidBrush(ExpandButtonColor), ExpandButtonBounds(e.Bounds)); g.DrawEllipse(new Pen(Color.LightGray), ExpandButtonBounds(e.Bounds)); Point p1 ; Point p2; Point p3; if (tn.IsExpanded) { p1 = new Point(ExpandButtonBounds(e.Bounds).X + 3, ExpandButtonBounds(e.Bounds).Bottom- 4); p2 = new Point(ExpandButtonBounds(e.Bounds).X + (ExpandButtonSize.Width) / 2, ExpandButtonBounds(e.Bounds).Top+ 5); p3 = new Point(ExpandButtonBounds(e.Bounds).Right - 3, ExpandButtonBounds(e.Bounds).Bottom -4); } else { p1 = new Point(ExpandButtonBounds(e.Bounds).X + 3, ExpandButtonBounds(e.Bounds).Y + 4); p2 = new Point(ExpandButtonBounds(e.Bounds).X + (ExpandButtonSize.Width) / 2, ExpandButtonBounds(e.Bounds).Bottom - 5); p3 = new Point(ExpandButtonBounds(e.Bounds).Right - 3, ExpandButtonBounds(e.Bounds).Y + 4); } GraphicsPath gp = new GraphicsPath(); gp.AddLine(p1, p2); gp.AddLine(p2, p3); g.DrawPath(new Pen(Color.FromArgb(255,150,0,0), 2f), gp); //绘制分组的文本 TextRenderer.DrawText(g, e.Node.Text, this.Font, GroupTitleBounds(e.Bounds), this.GroupTitleColor, TextFormatFlags.Left | TextFormatFlags.VerticalCenter | TextFormatFlags.EndEllipsis); } } else if(tn.Level==1) { //e.DrawDefault = true; using (Graphics g = e.Graphics) { if (tn.IsSelected) { TextRenderer.DrawText(g, e.Node.Text,new Font(this.Font.FontFamily.Name,this.Font.Size,FontStyle.Underline), e.Bounds, OverForeColor, TextFormatFlags.Left | TextFormatFlags.VerticalCenter); } else { TextRenderer.DrawText(g, e.Node.Text, this.Font, e.Bounds, this.ForeColor, TextFormatFlags.Left | TextFormatFlags.VerticalCenter); } } } } /// <summary> /// 展开按扭区域 /// </summary> /// <param name="childRect"></param> /// <returns></returns> private Rectangle ExpandButtonBounds(Rectangle childRect) { Rectangle lrect = new Rectangle(new Point(childRect.Right - ExpandButtonSize.Width *3/ 2, (childRect.Height - ExpandButtonSize.Height) / 2+childRect.Top), ExpandButtonSize); return lrect; } /// <summary> /// 取得分组标题绘制空间 /// </summary> /// <param name="childRect"></param> /// <returns></returns> private Rectangle GroupTitleBounds(Rectangle childRect) { Rectangle lrect = childRect; lrect.Width -= ExpandButtonSize.Width * 3 / 2+20; lrect.Offset(20, 0); return lrect; } #endregion #region //draw internal void RenderBackgroundInternal( Graphics g, Rectangle rect, Color baseColor, Color borderColor, Color innerBorderColor, float basePosition, bool drawBorder, LinearGradientMode mode) { if (drawBorder) { rect.Width--; rect.Height--; } using (LinearGradientBrush brush = new LinearGradientBrush( rect, Color.Transparent, Color.Transparent, mode)) { Color[] colors = new Color[4]; colors[0] = GetColor(baseColor, 0, 35, 24, 9); colors[1] = GetColor(baseColor, 0, 13, 8, 3); colors[2] = baseColor; colors[3] = GetColor(baseColor, 0, 68, 69, 54); ColorBlend blend = new ColorBlend(); blend.Positions = new float[] { 0.0f, basePosition, basePosition + 0.05f, 1.0f }; blend.Colors = colors; brush.InterpolationColors = blend; g.FillRectangle(brush, rect); } if (baseColor.A > 80) { Rectangle rectTop = rect; if (mode == LinearGradientMode.Vertical) { rectTop.Height = (int)(rectTop.Height * basePosition); } else { rectTop.Width = (int)(rect.Width * basePosition); } using (SolidBrush brushAlpha = new SolidBrush(Color.FromArgb(80, 255, 255, 255))) { g.FillRectangle(brushAlpha, rectTop); } } if (drawBorder) { using (Pen pen = new Pen(borderColor)) { g.DrawRectangle(pen, rect); } rect.Inflate(-1, -1); using (Pen pen = new Pen(innerBorderColor)) { g.DrawRectangle(pen, rect); } } } internal void RenderBackgroundInternalRate( Graphics g, Rectangle rect, Color baseColor, Color borderColor, Color innerBorderColor, float basePosition, bool drawBorder,float rate) { if (drawBorder) { rect.Width--; rect.Height--; } using (LinearGradientBrush brush = new LinearGradientBrush( rect, Color.Transparent, Color.Transparent,rate)) { Color[] colors = new Color[4]; colors[0] = GetColor(baseColor, 0, 35, 24, 9); colors[1] = GetColor(baseColor, 0, 13, 8, 3); colors[2] = baseColor; colors[3] = GetColor(baseColor, 0, 68, 69, 54); ColorBlend blend = new ColorBlend(); blend.Positions = new float[] { 0.0f, basePosition, basePosition + 0.05f, 1.0f }; blend.Colors = colors; brush.InterpolationColors = blend; g.FillRectangle(brush, rect); } if (baseColor.A > 80) { Rectangle rectTop = rect; if (true/*mode == LinearGradientMode.Vertical*/) { rectTop.Height = (int)(rectTop.Height * basePosition); } else { rectTop.Width = (int)(rect.Width * basePosition); } using (SolidBrush brushAlpha = new SolidBrush(Color.FromArgb(80, 255, 255, 255))) { g.FillRectangle(brushAlpha, rectTop); } } if (drawBorder) { using (Pen pen = new Pen(borderColor)) { g.DrawRectangle(pen, rect); } rect.Inflate(-1, -1); using (Pen pen = new Pen(innerBorderColor)) { g.DrawRectangle(pen, rect); } } } private Color GetColor(Color colorBase, int a, int r, int g, int b) { int a0 = colorBase.A; int r0 = colorBase.R; int g0 = colorBase.G; int b0 = colorBase.B; if (a + a0 > 255) { a = 255; } else { a = a + a0; } if (r + r0 > 255) { r = 255; } else { r = r + r0; } if (g + g0 > 255) { g = 255; } else { g = g + g0; } if (b + b0 > 255) { b = 255; } else { b = b + b0; } return Color.FromArgb(a, r, g, b); } private Color GetColor2(Color colorBase, int a, int r, int g, int b) { int a0 = colorBase.A; int r0 = colorBase.R; int g0 = colorBase.G; int b0 = colorBase.B; if (a + a0 > 255) { a = 255; } else { a = a + a0; } if (r0 - r < 0) { r = 0; } else { r = r0 - r; } if (g0 - g < 0) { g = 0; } else { g = g0 - g; } if (b0 - b < 0) { b = 0; } else { b = b0 - b; } return Color.FromArgb(a, r, g, b); } #endregion public static int LOWORD(int value) { return value & 0xFFFF; } public static int HIWORD(int value) { return value >> 16; } }}