c# 实现控件拖拽

using System;using System.Windows.Forms;using System.Drawing;namespace ImageTool{ /**//// <summary> /// ControlMove 的摘要说明。 /// </summary> public class ControlMove { #region private定义 private const int MIN_SIZE = 10; //对控缩放的最小值 private const int BOX_SIZE = 7; //调整大小触模柄方框大小 public bool _IsCtrlKey = false; private TextBox _textbox; private Control _MControl = null; private bool _IsMouseDown = false; private Point _oPointClicked; private Color BOX_COLOR = Color.White; private Label[] _lbl = new Label[8]; private int _startl, _startt, _startw, _starth; private bool _dragging; private Cursor[] _arrArrow = new Cursor[] {Cursors.SizeNWSE, Cursors.SizeNS, Cursors.SizeNESW, Cursors.SizeWE, Cursors.SizeNWSE, Cursors.SizeNS, Cursors.SizeNESW, Cursors.SizeWE}; #endregion #region 构造函数 /**//// <summary> /// 构造控件拖动对象 /// </summary> /// <param name="moveControl">需要拖动的控件</param> public ControlMove(Control moveControl) { // // TODO: 在此处添加构造函数逻辑 // _MControl = moveControl; _MControl.MouseDown += new MouseEventHandler(this.Control_MouseDown); _MControl.MouseUp += new MouseEventHandler(this.Control_MouseUp); _MControl.MouseMove += new MouseEventHandler(this.Control_MouseMove); _MControl.Click += new System.EventHandler(this.Control_Click); //构造8个调整大小触模柄 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.handle_MouseDown); _lbl[i].MouseMove += new MouseEventHandler(this.handle_MouseMove); _lbl[i].MouseUp += new MouseEventHandler(this.handle_MouseUp); } CreateTextBox(); Create(); //Control_Click((object)sender, (System.EventArgs)e); } #endregion #region 需拖动控件键盘事件 private void textBox_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e) { if (e.KeyValue == 37 || e.KeyValue == 38 || e.KeyValue == 39 || e.KeyValue == 40) { if (e.KeyValue == 37) _MControl.Left -= 1; if (e.KeyValue == 38) _MControl.Top -=1; if (e.KeyValue == 39) _MControl.Left += 1; if (e.KeyValue == 40) _MControl.Top +=1; MoveHandles(); ControlLocality(); _MControl.Visible = true; } if (e.KeyValue == 46) { for (int i = 0; i<8; i++) { _MControl.Parent.Controls.Remove(_lbl[i]); } _MControl.Parent.Controls.Remove(_MControl); _textbox.Parent.Controls.Remove(_textbox); } if (e.KeyValue == 17) { _IsCtrlKey = true; //MessageBox.Show("a"); } } #endregion #region 需拖动控件鼠标事件 private void Control_Click(object sender, System.EventArgs e) { _textbox.Focus(); _MControl = (sender as Control); MoveHandles(); if (_IsCtrlKey == false) { for(int i=0;i<_MControl.Parent.Controls.Count;i++) { if(_MControl.Parent.Controls[i].Text.Trim().Length == 0 && _MControl.Parent.Controls[i] is Label) { _MControl.Parent.Controls[i].Visible = false; } } } } private void Control_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e) { _IsMouseDown = true; _oPointClicked = new Point(e.X,e.Y); for (int i = 0; i<8; i++) { _MControl.Parent.Controls.Add(_lbl[i]); _lbl[i].BringToFront(); } HideHandles(); } private void Control_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e) { _IsMouseDown = false; MoveHandles(); ShowHandles(); _MControl.Visible = true; } private void Control_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e) { if(_IsMouseDown) { int l = _MControl.Left + e.X - _oPointClicked.X; int t = _MControl.Top + e.Y - _oPointClicked.Y; int w = _MControl.Width; int h = _MControl.Height; l =(l<0)?0:((l+w > _MControl.Parent.ClientRectangle.Width)? _MControl.Parent.ClientRectangle.Width-w:l); t =(t<0)?0:((t+h> _MControl.Parent.ClientRectangle.Height)? _MControl.Parent.ClientRectangle.Height-h:t); _MControl.Left = l; _MControl.Top = t; ControlLocality(); } //_MControl.Cursor=Cursors.SizeAll; } #endregion #region 调整大小触模柄鼠标事件 private void handle_MouseDown(object sender, MouseEventArgs e) { _dragging = true; _startl = _MControl.Left; _startt = _MControl.Top; _startw = _MControl.Width; _starth = _MControl.Height; HideHandles(); } // 通过触模柄调整控件大小 // 0 1 2 // 7 3 // 6 5 4 private void handle_MouseMove(object sender, MouseEventArgs e) { int l = _MControl.Left; int w = _MControl.Width; int t = _MControl.Top; int h = _MControl.Height; if (_dragging) { switch (((Label)sender).TabIndex) { //l算法：控件左边X坐标 ＋ 鼠标在触模柄X坐标 < 控件左边X坐标 ＋ 父控件宽度 - 控件大小 ？控件左边X坐标 ＋ 鼠标在触模柄X坐标 ：控件左边X坐标 ＋ 父控件宽度 - 控件大小 //t算法： //w算法： //h算法： case 0: // _dragging top-left 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 - _MControl.Left; h = _startt + _starth - _MControl.Top; break; case 1: // _dragging top-center sizing box t = _startt + e.Y < _startt + _starth - MIN_SIZE ? _startt + e.Y : _startt + _starth - MIN_SIZE; h = _startt + _starth - _MControl.Top; break; case 2: // _dragging top-right 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 - _MControl.Top; break; case 3: // _dragging right-middle sizing box w = _startw + e.X > MIN_SIZE ? _startw + e.X : MIN_SIZE; break; case 4: // _dragging right-bottom 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 center-bottom sizing box h = _starth + e.Y > MIN_SIZE ? _starth + e.Y : MIN_SIZE; break; case 6: // _dragging left-bottom sizing box l = _startl + e.X < _startl + _startw - MIN_SIZE ? _startl + e.X : _startl + _startw - MIN_SIZE; w = _startl + _startw - _MControl.Left; h = _starth + e.Y > MIN_SIZE ? _starth + e.Y : MIN_SIZE; break; case 7: // _dragging left-middle sizing box l = _startl + e.X < _startl + _startw - MIN_SIZE ? _startl + e.X : _startl + _startw - MIN_SIZE; w = _startl + _startw - _MControl.Left; break; } l =(l<0)?0:l; t =(t<0)?0:t; _MControl.SetBounds(l,t,w,h); } } private void handle_MouseUp(object sender, MouseEventArgs e) { _dragging = false; MoveHandles(); ShowHandles(); } #endregion private方法#region private方法 private void Create() { //_IsMouseDown = true; //_oPointClicked = new Point(e.X,e.Y); for (int i = 0; i<8; i++) { _MControl.Parent.Controls.Add(_lbl[i]); _lbl[i].BringToFront(); } HideHandles(); } private void CreateTextBox() { _textbox = new TextBox(); _textbox.CreateControl(); _textbox.Parent = _MControl.Parent; _textbox.Width = 0; _textbox.Height = 0; _textbox.TabStop = true; _textbox.KeyDown += new System.Windows.Forms.KeyEventHandler(textBox_KeyDown); } private void ControlLocality() { if (_MControl.Location.X < 0) { _MControl.Visible = false; _MControl.Left = 0; } if (_MControl.Location.Y < 0) { _MControl.Visible = false; _MControl.Top = 0; } if (_MControl.Location.X + _MControl.Width > _MControl.Parent.Width) { _MControl.Visible = false; _MControl.Left = _MControl.Parent.Width - _MControl.Width; } if (_MControl.Location.Y + _MControl.Height > _MControl.Parent.Height) { _MControl.Visible = false; _MControl.Top = _MControl.Parent.Height - _MControl.Height; } } private void HideHandles() { for (int i = 0; i<8; i++) { _lbl[i].Visible = false; } } private void MoveHandles() { int sX = _MControl.Left - BOX_SIZE; int sY = _MControl.Top - BOX_SIZE; int sW = _MControl.Width + BOX_SIZE; int sH = _MControl.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 ShowHandles() { if (_MControl !=null) { for (int i = 0; i<8; i++) { _lbl[i].Visible = true; } } } #endregion }}