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