0 Explore TreeView
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;
}
}
