FrameControl
/******************************************************************
* 创 建 人： SamWang
* 创建时间： 2012-5-10 17:00
* 描 述：
* 在控件外部加上边框，用于拖拉，以改变内部控件的大小
* 原 理：
* 版 本： V1.0
* 环 境： VS2010
******************************************************************/
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using System.Drawing;
using System.Drawing.Drawing2D;
namespace DragControl
{
public class FrameControl : UserControl
{
#region Constructors
/// <summary>
/// 构造函数
/// </summary>
public FrameControl(Control ctrl)
{
baseControl = ctrl;
AddEvents();
CreateBounds();
}
#endregion
#region Fields
const int Band = 6; //调整大小的响应边框
private int MinWidth = 20; //最小宽度
private int MinHeight = 20;//最小高度
Size square = new Size(Band, Band);//小矩形大小
Control baseControl; //基础控件，即被包围的控件
Rectangle[] smallRects = new Rectangle[8];//边框中的八个小圆圈
Rectangle[] sideRects = new Rectangle[4];//四条边框，用来做响应区域
Point[] linePoints = new Point[5];//四条边，用于画虚线
Graphics g; //画图板
Rectangle ControlRect; //控件包含边框的区域
private Point pPoint; //上个鼠标坐标
private Point cPoint; //当前鼠标坐标
private MousePosOnCtrl mpoc;
#endregion
#region Properties
/// <summary>
/// 鼠标在控件中位置
/// </summary>
enum MousePosOnCtrl
{
NONE = 0,
TOP = 1,
RIGHT = 2,
BOTTOM = 3,
LEFT = 4,
TOPLEFT = 5,
TOPRIGHT = 6,
BOTTOMLEFT = 7,
BOTTOMRIGHT = 8,
}
#endregion
#region Methods
/// <summary>
/// 加载事件
/// </summary>
private void AddEvents()
{
this.Name = "FrameControl" + baseControl.Name;
this.MouseDown += new MouseEventHandler(FrameControl_MouseDown);
this.MouseMove += new MouseEventHandler(FrameControl_MouseMove);
this.MouseUp += new MouseEventHandler(FrameControl_MouseUp);
}
#region 创建边框
/// <summary>
/// 建立控件可视区域
/// </summary>
private void CreateBounds()
{
//创建边界
int X = baseControl.Bounds.X - square.Width - 1;
int Y = baseControl.Bounds.Y - square.Height - 1;
int Height = baseControl.Bounds.Height + (square.Height * 2) + 2;
int Width = baseControl.Bounds.Width + (square.Width * 2) + 2;
this.Bounds = new Rectangle(X, Y, Width, Height);
this.BringToFront();
SetRectangles();
//设置可视区域
this.Region = new Region(BuildFrame());
g = this.CreateGraphics();
}
/// <summary>
/// 设置定义8个小矩形的范围
/// </summary>
void SetRectangles()
{
//左上
smallRects[0] = new Rectangle(new Point(0, 0), square);
//右上
smallRects[1] = new Rectangle(new Point(this.Width - square.Width - 1, 0), square);
//左下
smallRects[2] = new Rectangle(new Point(0, this.Height - square.Height - 1), square);
//右下
smallRects[3] = new Rectangle(new Point(this.Width - square.Width - 1, this.Height - square.Height - 1), square);
//上中
smallRects[4] = new Rectangle(new Point(this.Width / 2 - 1, 0), square);
//下中
smallRects[5] = new Rectangle(new Point(this.Width / 2 - 1, this.Height - square.Height - 1), square);
//左中
smallRects[6] = new Rectangle(new Point(0, this.Height / 2 - 1), square);
//右中
smallRects[7] = new Rectangle(new Point(square.Width + baseControl.Width + 1, this.Height / 2 - 1), square);
//四条边线
//左上
linePoints[0] = new Point(square.Width / 2, square.Height / 2);
//右上
linePoints[1] = new Point(this.Width - square.Width / 2 - 1, square.Height / 2);
//右下
linePoints[2] = new Point(this.Width - square.Width / 2 - 1, this.Height - square.Height / 2);
//左下
linePoints[3] = new Point(square.Width / 2, this.Height - square.Height / 2 - 1);
//左上
linePoints[4] = new Point(square.Width / 2, square.Height / 2);
//整个包括周围边框的范围
ControlRect = new Rectangle(new Point(0, 0), this.Bounds.Size);
}
/// <summary>
/// 设置边框控件可视区域
/// </summary>
/// <returns></returns>
private GraphicsPath BuildFrame()
{
GraphicsPath path = new GraphicsPath();
//上边框
sideRects[0] = new Rectangle(0, 0, this.Width - square.Width - 1, square.Height + 1);
//左边框
sideRects[1] = new Rectangle(0, square.Height + 1, square.Width + 1, this.Height - square.Height - 1);
//下边框
sideRects[2] = new Rectangle(square.Width + 1, this.Height - square.Height - 1, this.Width - square.Width - 1, square.Height + 1);
//右边框
sideRects[3] = new Rectangle(this.Width - square.Width - 1, 0, square.Width + 1, this.Height - square.Height - 1);
path.AddRectangle(sideRects[0]);
path.AddRectangle(sideRects[1]);
path.AddRectangle(sideRects[2]);
path.AddRectangle(sideRects[3]);
return path;
}
#endregion
/// <summary>
/// 绘图
/// </summary>
public void Draw()
{
this.BringToFront();
//g.FillRectangles(Brushes.LightGray, sideRects); //填充四条边框的内部
Pen pen = new Pen(Color.Black);
pen.DashStyle = DashStyle.Dot;//设置为虚线,用虚线画四边，模拟微软效果
g.DrawLines(pen, linePoints);//绘制四条边线
g.FillRectangles(Brushes.White, smallRects); //填充8个小矩形的内部
foreach (Rectangle smallRect in smallRects)
{
g.DrawEllipse(Pens.Black, smallRect); //绘制8个小椭圆
}
//g.DrawRectangles(Pens.Black, smallRects); //绘制8个小矩形的黑色边线
}
/// <summary>
/// 设置光标状态
/// </summary>
public bool SetCursorShape(int x, int y)
{
Point point = new Point(x, y);
if (!ControlRect.Contains(point))
{
Cursor.Current = Cursors.Arrow;
return false;
}
else if (smallRects[0].Contains(point))
{
Cursor.Current = Cursors.SizeNWSE;
mpoc = MousePosOnCtrl.TOPLEFT;
}
else if (smallRects[1].Contains(point))
{
Cursor.Current = Cursors.SizeNESW;
mpoc = MousePosOnCtrl.TOPRIGHT;
}
else if (smallRects[2].Contains(point))
{
Cursor.Current = Cursors.SizeNESW;
mpoc = MousePosOnCtrl.BOTTOMLEFT;
}
else if (smallRects[3].Contains(point))
{
Cursor.Current = Cursors.SizeNWSE;
mpoc = MousePosOnCtrl.BOTTOMRIGHT;
}
else if (sideRects[0].Contains(point))
{
Cursor.Current = Cursors.SizeNS;
mpoc = MousePosOnCtrl.TOP;
}
else if (sideRects[1].Contains(point))
{
Cursor.Current = Cursors.SizeWE;
mpoc = MousePosOnCtrl.LEFT;
}
else if (sideRects[2].Contains(point))
{
Cursor.Current = Cursors.SizeNS;
mpoc = MousePosOnCtrl.BOTTOM;
}
else if (sideRects[3].Contains(point))
{
Cursor.Current = Cursors.SizeWE;
mpoc = MousePosOnCtrl.RIGHT;
}
else
{
Cursor.Current = Cursors.Arrow;
}
return true;
}
/// <summary>
/// 控件移动
/// </summary>
private void ControlMove()
{
cPoint = Cursor.Position;
int x = cPoint.X - pPoint.X;
int y = cPoint.Y - pPoint.Y;
switch (this.mpoc)
{
case MousePosOnCtrl.TOP:
if (baseControl.Height - y > MinHeight)
{
baseControl.Top += y;
baseControl.Height -= y;
}
else
{
baseControl.Top -= MinHeight - baseControl.Height;
baseControl.Height = MinHeight;
}
break;
case MousePosOnCtrl.BOTTOM:
if (baseControl.Height + y > MinHeight)
{
baseControl.Height += y;
}
else
{
baseControl.Height = MinHeight;
}
break;
case MousePosOnCtrl.LEFT:
if (baseControl.Width - x > MinWidth)
{
baseControl.Left += x;
baseControl.Width -= x;
}
else
{
baseControl.Left -= MinWidth - baseControl.Width;
baseControl.Width = MinWidth;
}
break;
case MousePosOnCtrl.RIGHT:
if (baseControl.Width + x > MinWidth)
{
baseControl.Width += x;
}
else
{
baseControl.Width = MinWidth;
}
break;
case MousePosOnCtrl.TOPLEFT:
if (baseControl.Height - y > MinHeight)
{
baseControl.Top += y;
baseControl.Height -= y;
}
else
{
baseControl.Top -= MinHeight - baseControl.Height;
baseControl.Height = MinHeight;
}
if (baseControl.Width - x > MinWidth)
{
baseControl.Left += x;
baseControl.Width -= x;
}
else
{
baseControl.Left -= MinWidth - baseControl.Width;
baseControl.Width = MinWidth;
}
break;
case MousePosOnCtrl.TOPRIGHT:
if (baseControl.Height - y > MinHeight)
{
baseControl.Top += y;
baseControl.Height -= y;
}
else
{
baseControl.Top -= MinHeight - baseControl.Height;
baseControl.Height = MinHeight;
}
if (baseControl.Width + x > MinWidth)
{
baseControl.Width += x;
}
else
{
baseControl.Width = MinWidth;
}
break;
case MousePosOnCtrl.BOTTOMLEFT:
if (baseControl.Height + y > MinHeight)
{
baseControl.Height += y;
}
else
{
baseControl.Height = MinHeight;
}
if (baseControl.Width - x > MinWidth)
{
baseControl.Left += x;
baseControl.Width -= x;
}
else
{
baseControl.Left -= MinWidth - baseControl.Width;
baseControl.Width = MinWidth;
}
break;
case MousePosOnCtrl.BOTTOMRIGHT:
if (baseControl.Height + y > MinHeight)
{
baseControl.Height += y;
}
else
{
baseControl.Height = MinHeight;
}
if (baseControl.Width + x > MinWidth)
{
baseControl.Width += x;
}
else
{
baseControl.Width = MinWidth;
}
break;
}
pPoint = Cursor.Position;
}
#endregion
#region Events
/// <summary>
/// 鼠标按下事件：记录当前鼠标相对窗体的坐标
/// </summary>
void FrameControl_MouseDown(object sender, MouseEventArgs e)
{
pPoint = Cursor.Position;
}
/// <summary>
/// 鼠标移动事件：让控件跟着鼠标移动
/// </summary>
void FrameControl_MouseMove(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
this.Visible = false;
MoveControl.DrawDragBound(baseControl);
ControlMove();
}
else
{
this.Visible = true;
SetCursorShape(e.X, e.Y); //更新鼠标指针样式
}
}
/// <summary>
/// 鼠标弹起事件：让自定义的边框出现
/// </summary>
void FrameControl_MouseUp(object sender, MouseEventArgs e)
{
this.baseControl.Refresh(); //刷掉黑色边框
this.Visible = true;
CreateBounds();
Draw();
}
#endregion
}
}
