c# 控件 拖拽类
代码
using System;
using System.Windows.Forms;
using System.Drawing;
namespace ImageTool
{
/**//// <summary>
/// ControlMove 的摘要说明。
/// </summary>
public class ControlMove
{
//private定义
#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
//构造函数
#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
//需拖动控件键盘事件
#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
//需拖动控件鼠标事件
#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
//调整大小触模柄鼠标事件
#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
}
}
调用方式
ControlMove a = new ControlMove(textBox1);
ControlMove b = new ControlMove(button1);