PickBoxTest示例(1)

using System;
using System.Windows.Forms;
using System.Drawing;

namespace PickBoxTest
{
    /// <summary>
    /// 这个类实现了窗体控件的 大小和移动函数
    /// 用户运行时编辑
    /// </summary>
    public class PickBox
    {
        //////////////////////////////////////////////////////////////////
        // 私有常量和变量
        //////////////////////////////////////////////////////////////////

        private const int BOX_SIZE = 6;
        private Color BOX_COLOR = Color.FromArgb(0, 0, 255);
        //private Color BOX_COLOR = Color.Blue;
        //private ContainerControl m_container;
        private Control m_control;
        private Label[] lbl = new Label[8];
        private int startl;
        private int startt;
        private int startw;
        private int starth;
        private int startx;
        private int starty;
        private bool dragging;
        private Cursor[] arrArrow = new Cursor[] {Cursors.SizeNWSE, Cursors.SizeNS,
            Cursors.SizeNESW, Cursors.SizeWE, Cursors.SizeNWSE, Cursors.SizeNS,
            Cursors.SizeNESW, Cursors.SizeWE};
        private Cursor oldCursor;

        private const int MIN_SIZE = 20;

        public PickBox()
        {
            for (int i = 0; i < 8; i++)
            {
                lbl[i] = new Label();
                lbl[i].TabIndex = i;
                lbl[i].FlatStyle = 0;
                lbl[i].BorderStyle = BorderStyle.FixedSingle;
                lbl[i].BackColor = BOX_COLOR;
                lbl[i].Cursor = arrArrow[i];
                lbl[i].Text = "";
                lbl[i].BringToFront();
                lbl[i].MouseDown += new MouseEventHandler(this.lbl_MouseDown);
                lbl[i].MouseMove += new MouseEventHandler(this.lbl_MouseMove);
                lbl[i].MouseUp += new MouseEventHandler(this.lbl_MouseUp);
            }
        }


        public void WireControl(Control ctl)
        {
            ctl.Click += new EventHandler(this.SelectControl);

        }


        /////////////////////////////////////////////////////////////////
        //私有方法
        /////////////////////////////////////////////////////////////////

        //
        // 将pick box 附加到 相应的控件上
        //
        private void SelectControl(object sender, EventArgs e)
        {

            //移除上一个控件的事件处理.
            if (m_control is Control)
            {
                m_control.Cursor = oldCursor;


                m_control.MouseDown -= new MouseEventHandler(this.ctl_MouseDown);
                m_control.MouseMove -= new MouseEventHandler(this.ctl_MouseMove);
                m_control.MouseUp -= new MouseEventHandler(this.ctl_MouseUp);

                m_control = null;
            }

            m_control = (Control)sender;
            //添加用于将选定控件移动的事件处理程序
            m_control.MouseDown += new MouseEventHandler(this.ctl_MouseDown);
            m_control.MouseMove += new MouseEventHandler(this.ctl_MouseMove);
            m_control.MouseUp += new MouseEventHandler(this.ctl_MouseUp);

            //将大小调整手柄添加到控件容器中
            for (int i = 0; i < 8; i++)
            {
                m_control.Parent.Controls.Add(lbl[i]);
                lbl[i].BringToFront();
            }

            //位置控制周围的大小调整
            MoveHandles();

            //显示大小调整手柄
            ShowHandles();

            oldCursor = m_control.Cursor;
            m_control.Cursor = Cursors.SizeAll;

        }

        public void Remove()
        {
            HideHandles();
            m_control.Cursor = oldCursor;
        }

        private void ShowHandles()
        {
            if (m_control != null)
            {
                for (int i = 0; i < 8; i++)
                {
                    lbl[i].Visible = true;
                }
            }
        }

        private void HideHandles()
        {
            for (int i = 0; i < 8; i++)
            {
                lbl[i].Visible = false;
            }
        }

        private void MoveHandles()
        {
            int sX = m_control.Left - BOX_SIZE;
            int sY = m_control.Top - BOX_SIZE;
            int sW = m_control.Width + BOX_SIZE;
            int sH = m_control.Height + BOX_SIZE;
            int hB = BOX_SIZE / 2;

            int[] arrPosX = new int[] {sX+hB, sX + sW / 2, sX + sW-hB, sX + sW-hB,
            sX + sW-hB, sX + sW / 2, sX+hB, sX+hB};

            int[] arrPosY = new int[] {sY+hB, sY+hB, sY+hB, sY + sH / 2, sY + sH-hB,
            sY + sH-hB, sY + sH-hB, sY + sH / 2};

            for (int i = 0; i < 8; i++)
                lbl[i].SetBounds(arrPosX[i], arrPosY[i], BOX_SIZE, BOX_SIZE);
        }

        private void lbl_MouseDown(object sender, MouseEventArgs e)
        {
            dragging = true;
            startl = m_control.Left;
            startt = m_control.Top;
            startw = m_control.Width;
            starth = m_control.Height;
            HideHandles();
        }
        private void lbl_MouseMove(object sender, MouseEventArgs e)
        {
            int l = m_control.Left;
            int w = m_control.Width;
            int t = m_control.Top;
            int h = m_control.Height;
            if (dragging)
            {
                switch (((Label)sender).TabIndex)
                {
                    case 0: // Dragging 上左脚的拖动 sizing box
                        l = startl + e.X < startl + startw - MIN_SIZE ? startl + e.X : startl + startw - MIN_SIZE;
                        t = startt + e.Y < startt + starth - MIN_SIZE ? startt + e.Y : startt + starth - MIN_SIZE;
                        w = startl + startw - m_control.Left;
                        h = startt + starth - m_control.Top;
                        break;
                    case 1: // Dragging 上中间的拖动 sizing box
                        t = startt + e.Y < startt + starth - MIN_SIZE ? startt + e.Y : startt + starth - MIN_SIZE;
                        h = startt + starth - m_control.Top;
                        break;
                    case 2: // Dragging 上右脚边 sizing box
                        w = startw + e.X > MIN_SIZE ? startw + e.X : MIN_SIZE;
                        t = startt + e.Y < startt + starth - MIN_SIZE ? startt + e.Y : startt + starth - MIN_SIZE;
                        h = startt + starth - m_control.Top;
                        break;
                    case 3: // Dragging 右中 sizing box
                        w = startw + e.X > MIN_SIZE ? startw + e.X : MIN_SIZE;
                        break;
                    case 4: // Dragging 右下 sizing box
                        w = startw + e.X > MIN_SIZE ? startw + e.X : MIN_SIZE;
                        h = starth + e.Y > MIN_SIZE ? starth + e.Y : MIN_SIZE;
                        break;
                    case 5: // Dragging 下中 sizing box
                        h = starth + e.Y > MIN_SIZE ? starth + e.Y : MIN_SIZE;
                        break;
                    case 6: // Dragging 左下 sizing box
                        l = startl + e.X < startl + startw - MIN_SIZE ? startl + e.X : startl + startw - MIN_SIZE;
                        w = startl + startw - m_control.Left;
                        h = starth + e.Y > MIN_SIZE ? starth + e.Y : MIN_SIZE;
                        break;
                    case 7: // Dragging 右中 sizing box
                        l = startl + e.X < startl + startw - MIN_SIZE ? startl + e.X : startl + startw - MIN_SIZE;
                        w = startl + startw - m_control.Left;
                        break;
                }
                l = (l < 0) ? 0 : l;
                t = (t < 0) ? 0 : t;
                m_control.SetBounds(l, t, w, h);
            }
        }
        private void lbl_MouseUp(object sender, MouseEventArgs e)
        {
            dragging = false;
            MoveHandles();
            ShowHandles();
        }

        private void ctl_MouseDown(object sender, MouseEventArgs e)
        {
            dragging = true;
            startx = e.X;
            starty = e.Y;
            HideHandles();
        }
        private void ctl_MouseMove(object sender, MouseEventArgs e)
        {
            if (dragging)
            {
                int l = m_control.Left + e.X - startx;
                int t = m_control.Top + e.Y - starty;
                int w = m_control.Width;
                int h = m_control.Height;
                l = (l < 0) ? 0 : ((l + w > m_control.Parent.ClientRectangle.Width) ?
                  m_control.Parent.ClientRectangle.Width - w : l);
                t = (t < 0) ? 0 : ((t + h > m_control.Parent.ClientRectangle.Height) ?
                m_control.Parent.ClientRectangle.Height - h : t);
                m_control.Left = l;
                m_control.Top = t;
            }
        }
        private void ctl_MouseUp(object sender, MouseEventArgs e)
        {
            dragging = false;
            MoveHandles();
            ShowHandles();
        }

    }
}