尽可能接近WINDOWS 8的资源管理器效果（这里只模仿它的效果，处理文件功能不包括在内）
- TREEVIEW可以增加空白并且空白处不能单击
- 重绘三角箭头
-
重绘选中时的边框和填充色
- 重绘失去焦点时选中时的边框和填充色
- 重绘光标所在处的节点背景 MOUSE Hover
- 闪烁的问题处理 当TREEVIEW大小改变时闪烁很严重
- 做到自定义控件
- 图片背景
- 光标的在不同位置的相关改变
- WINDOWS 8的资源管理器是不显示水平滚动条
相关参考
画节点上的ImageList的图标
http://zhuad627.blog.163.com/blog/static/94780512011618103157479/
选中的节点颜色
边框
颜色
102,167,232
填充颜色
209,232,255
TREEVIEW失去焦点
边框
颜色
222,222,222
填充颜色
247,247,247
光标所在的节点的
边框
颜色
112,192,231
填充颜色
229,243,251
光标的在不同位置的相关改变
12
TreeViewEx.cs
源码
编译环境是vs2015 文件已经解决了控件闪烁问题
using System.Drawing; using System.Runtime.InteropServices; namespace System.Windows.Forms { public class API { private const int WS_HSCROLL = 0x100000; private const int WS_VSCROLL = 0x200000; private const int GWL_STYLE = (-16); [DllImport("User32.dll")] public static extern IntPtr LoadCursor(IntPtr hInstance, CursorType cursor); [DllImport("user32.dll")] public static extern int GetWindowLong(IntPtr hwnd, int nIndex); [DllImport("user32.dll")] public static extern bool ShowScrollBar(IntPtr hWnd, int wBar, bool bShow); public const int WM_PRINTCLIENT = 0x0318; public const int PRF_CLIENT = 0x00000004; [DllImport("user32.dll")] public static extern IntPtr SendMessage(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam); /// <summary>
/// 显示系统光标小手 /// 像Win7非经典主题的小手光标 /// </summary>
public static Cursor Hand { get { IntPtr h = LoadCursor(IntPtr.Zero, CursorType.IDC_HAND); return new Cursor(h); } } public static bool IsWinXP { get { OperatingSystem OS = Environment.OSVersion; return (OS.Platform == PlatformID.Win32NT) && ((OS.Version.Major > 5) || ((OS.Version.Major == 5) && (OS.Version.Minor == 1))); } } public static bool IsWinVista { get { OperatingSystem OS = Environment.OSVersion; return (OS.Platform == PlatformID.Win32NT) && (OS.Version.Major >= 6); } } /// <summary>
/// 判断是否出现垂直滚动条 /// </summary>
/// <param name="ctrl">待测控件</param>
/// <returns>出现垂直滚动条返回true，否则为false</returns>
public static bool IsVerticalScrollBarVisible(Control ctrl) { if (!ctrl.IsHandleCreated) return false; return (GetWindowLong(ctrl.Handle, GWL_STYLE) & WS_VSCROLL) != 0; } /// <summary>
/// 判断是否出现水平滚动条 /// </summary>
/// <param name="ctrl">待测控件</param>
/// <returns>出现水平滚动条返回true，否则为false</returns>
public static bool IsHorizontalScrollBarVisible(Control ctrl) { if (!ctrl.IsHandleCreated) return false; return (GetWindowLong(ctrl.Handle, GWL_STYLE) & WS_HSCROLL) != 0; } } public enum CursorType : uint { IDC_ARROW = 32512U, IDC_IBEAM = 32513U, IDC_WAIT = 32514U, IDC_CROSS = 32515U, IDC_UPARROW = 32516U, IDC_SIZE = 32640U, IDC_ICON = 32641U, IDC_SIZENWSE = 32642U, IDC_SIZENESW = 32643U, IDC_SIZEWE = 32644U, IDC_SIZENS = 32645U, IDC_SIZEALL = 32646U, IDC_NO = 32648U, //小手
IDC_HAND = 32649U, IDC_APPSTARTING = 32650U, IDC_HELP = 32651U } public class TreeViewEx : TreeView { #region 双缓存重绘
private const int WM_VSCROLL = 0x0115; private const int WM_HSCROLL = 0x0114; //private const int WM_MOUSEWHEEL = 0x020A;
private const int TV_FIRST = 0x1100; private const int TVM_SETBKCOLOR = TV_FIRST + 29; private const int TVM_SETEXTENDEDSTYLE = TV_FIRST + 44; private const int TVS_EX_DOUBLEBUFFER = 0x0004; private void UpdateExtendedStyles() { int Style = 0; if (DoubleBuffered) Style |= TVS_EX_DOUBLEBUFFER; if (Style != 0) API.SendMessage(Handle, TVM_SETEXTENDEDSTYLE, (IntPtr)TVS_EX_DOUBLEBUFFER, (IntPtr)Style); } protected override void OnHandleCreated(EventArgs e) { base.OnHandleCreated(e); UpdateExtendedStyles(); if (!API.IsWinXP) API.SendMessage(Handle, TVM_SETBKCOLOR, IntPtr.Zero, (IntPtr)ColorTranslator.ToWin32(BackColor)); } protected override void OnPaint(PaintEventArgs e) { if (GetStyle(ControlStyles.UserPaint)) { Message m = new Message(); m.HWnd = Handle; m.Msg = API.WM_PRINTCLIENT; m.WParam = e.Graphics.GetHdc(); m.LParam = (IntPtr)API.PRF_CLIENT; DefWndProc(ref m); e.Graphics.ReleaseHdc(m.WParam); } base.OnPaint(e); } #endregion
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; } }