C# winform 运行时可以调整大小和位置的文本框

1.使用鼠标控制位置：在任意位置点击左键拖动

2.使用鼠标控制大小：在控件右下角待变为‘调整光标’是可以调整大小

3.使用键盘控制位置：alt + 方向键

4.使用键盘控制大小：ctrl + 方向键

using System.ComponentModel;

using System.Drawing;

using System.Windows.Forms;

namespace AppGenCode.Printer

{

public enum EnumAdjust

{

Nothing =0,

Size = 1,

Postion = 2

}

public partial class AdjustTextBox : TextBox

{

public AdjustTextBox()

{

InitializeComponent();

InitCtrl();

}

public AdjustTextBox(IContainer container)

{

container.Add(this);

InitializeComponent();

InitCtrl();

}

private bool m_isMoving = false;

private Point m_offset = new Point(0,0);

private Size m_intSize = new Size(0, 0);

private EnumAdjust m_adjust = EnumAdjust.Nothing;

private int m_x, m_y, m_w, m_h = 0;

private Rectangle RecAdjustSize

{

get { return new Rectangle(this.Width-15,this.Height-15,15,15);}

}

private Rectangle RecAdjustPostion

{

get { return new Rectangle(0, 0, this.Width, this.Height); }

}

private void InitCtrl()

{

this.Text = "asdf1234";

this.Multiline = true;

this.BorderStyle = BorderStyle.FixedSingle;

this.ReadOnly = true;

}

#region 鼠标事件

protected override void OnMouseDown(MouseEventArgs e)

{

m_isMoving = true;

m_offset = new Point(e.X, e.Y);

m_intSize.Width = this.Width;

m_intSize.Height = this.Height;

if (RecAdjustSize.Contains(e.X, e.Y)) //调整大小

{

this.Cursor = Cursors.SizeNWSE;

m_adjust = EnumAdjust.Size;

}

else if (RecAdjustPostion.Contains(e.X, e.Y)) //调整位置

{

this.Cursor = Cursors.SizeAll;

m_adjust = EnumAdjust.Postion;

}

else

{

m_adjust = EnumAdjust.Nothing;

}

base.OnMouseDown(e);

}

protected override void OnMouseUp(MouseEventArgs mevent)

{

Cursor = Cursors.Default;

m_isMoving = false;

base.OnMouseUp(mevent);

}

protected override void OnMouseMove(MouseEventArgs e)

{

CursorCtrl(e.X, e.Y);

m_x = this.Left;

m_y = this.Top;

m_w = this.Width;

m_h = this.Height;

if (m_isMoving)

{

switch (m_adjust)

{

case EnumAdjust.Size:

m_w = m_intSize.Width + (e.X - m_offset.X);

m_h = m_intSize.Height + (e.Y - m_offset.Y);

break;

case EnumAdjust.Postion:

m_x = Location.X + (e.X - m_offset.X);

m_y = Location.Y + (e.Y - m_offset.Y);

break;

}

BackColor = Color.Red;

this.SetBounds(m_x, m_y, m_w, m_h);

}

base.OnMouseMove(e);

}

#endregion

#region 键盘事件

protected override void OnPreviewKeyDown(PreviewKeyDownEventArgs e)

{

base.OnPreviewKeyDown(e);

if (e.Alt) //调整大小

{

switch (e.KeyCode)

{

case Keys.Left:

this.Width -= 5;

break;

case Keys.Right:

this.Width += 5;

break;

case Keys.Down:

this.Height += 5;

break;

case Keys.Up:

this.Height -= 5;

break;

}

return;

}

if (e.Control)

{

switch (e.KeyCode) //调整位置

{

case Keys.Left:

this.Left -= 5;

break;

case Keys.Right:

this.Left += 5;

break;

case Keys.Up:

this.Top -= 5;

break;

case Keys.Down:

this.Top += 5;

break;

}

}

}

#endregion

private void CursorCtrl(int x,int y)

{

if (!m_isMoving && RecAdjustSize.Contains(x,y))

{

this.Cursor = Cursors.SizeNWSE;

return;

}

this.Cursor = Cursors.Default;

}

}

}

草青工作室：http://blog.csdn.net/xxj_jing

原文地址：http://blog.csdn.net/xxj_jing/article/details/8594946