比如拖动一个textBox
using System.Runtime.InteropServices;
[DllImport("user32.dll",EntryPoint="SendMessage")]
public static extern int SendMessage(int hWnd,int wMsg,int wParam,int lParam);
[DllImport("user32.dll",EntryPoint="ReleaseCapture")]
public static extern int ReleaseCapture();
public const int WM_SysCommand = 0x0112;
public const int SC_MOVE = 0xF012;
private void textBox1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
ReleaseCapture();
SendMessage(this.textBox1.Handle.ToInt32(),WM_SysCommand,SC_MOVE,0);
}
using System.Runtime.InteropServices;
[DllImport("user32.dll",EntryPoint="SendMessage")]
public static extern int SendMessage(int hWnd,int wMsg,int wParam,int lParam);
[DllImport("user32.dll",EntryPoint="ReleaseCapture")]
public static extern int ReleaseCapture();
public const int WM_SysCommand = 0x0112;
public const int SC_MOVE = 0xF012;
private void textBox1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
ReleaseCapture();
SendMessage(this.textBox1.Handle.ToInt32(),WM_SysCommand,SC_MOVE,0);
}
也可以继承IMessageFilter接口,截获鼠标消息之后再去处理控件的效果。
//(在同一位置画两次即可消除虚线框,即采用的是异或方式画图)
//mousedown时捕捉鼠标,设置标志bMouseDown,同时调用上面语句画虚线框
//在mousemove中,如果标志bMouseDown为true,在原来位置画虚线框(消除原来的虚线框),然后在新的位置重新画虚线框,
//在mouseup中,如果标志bMouseDown为true,清除标志bMouseDown,取消捕捉鼠标,并再画一次虚线框,以便消除最后一条虚线框
//在mouseup中还要做一件事情,修改文本框位置到最终要移动到的位置private bool flag = false;
private Rectangle h;
private void textBox1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
this.flag = true;
Rectangle r = new Rectangle(this.Location.X + this.textBox1.Location.X,this.Location.Y + this.textBox1.Location.Y + this.textBox1.Size.Height,this.textBox1.Size.Width,this.textBox1.Size.Height);
h = r;
ControlPaint.DrawReversibleFrame(r,Color.White ,FrameStyle.Thick );
}private void textBox1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
{
if(this.flag)
{
ControlPaint.DrawReversibleFrame(h,Color.White ,FrameStyle.Thick );
Rectangle r = new Rectangle(this.Location.X + this.textBox1.Location.X +e.X,this.Location.Y + this.textBox1.Location.Y +e.Y + this.textBox1.Size.Height,this.textBox1.Size.Width,this.textBox1.Size.Height);
h = r;
ControlPaint.DrawReversibleFrame(r,Color.White ,FrameStyle.Thick );
System.Diagnostics.Debug.WriteLine(h.X.ToString() + " " + this.h.Y.ToString());
}
}private void textBox1_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
{
this.flag = false;
System.Diagnostics.Debug.WriteLine(h.X.ToString() + " " + this.h.Y.ToString());
ControlPaint.DrawReversibleFrame(h,Color.White ,FrameStyle.Thick );
textBox1.Location=new Point(h.X,h.Y);
}
只能在全屏状态下好使
最后一句改为
textBox1.Location= new Point( Control.MousePosition.X - this.Location.X ,Control.MousePosition.Y - this.Location.Y - this.textBox1.Height);
private void label1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
p=new Point(e.X,e.Y);
}private void label1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
{
if (e.Button==MouseButtons.Left )
{
if (ModifierKeys == Keys.Control)
{
Cursor=Cursors.SizeAll;
this.label1.Size = new Size(this.label1.Width+e.X-p.X,this.label1.Height+e.Y-p.Y);
p = new Point(e.X,e.Y);
}
else
{
this.label1.Location=new Point(e.X-p.X+this.label1.Left,e.Y-p.Y+this.label1.Top);
}
}
else
{
this.label1.Cursor=Cursors.Hand;
}
}
用类似
ReleaseCapture();
SendMessage(this.textBox1.Handle.ToInt32(),WM_SysCommand,SC_MOVE,0);
的方法,
能否实现在运行时,当控件获得焦点时,在控件四周出现边框用于调整大小,就像在.Net的窗体设计器里调整控件大小一样。
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;namespace WindowsApplication4
{
/// <summary>
/// Form1 的摘要说明。
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private CusTextBox textBox1;
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null;
public Form1()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent(); //
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
//
} public class CusTextBox: System.Windows.Forms.TextBox
{
private const int WM_NCHITTEST = 0x84;
private const int WM_SIZING = 532; private const int HTERROR = (-2);
private const int HTTRANSPARENT = (-1);
private const int HTNOWHERE = 0;
private const int HTCLIENT = 1;
private const int HTCAPTION = 2;
private const int HTSYSMENU = 3;
private const int HTGROWBOX = 4;
private const int HTSIZE = HTGROWBOX;
private const int HTMENU = 5;
private const int HTHSCROLL = 6;
private const int HTVSCROLL = 7;
private const int HTMINBUTTON = 8;
private const int HTMAXBUTTON = 9;
private const int HTLEFT = 10;
private const int HTRIGHT = 11;
private const int HTTOP = 12;
private const int HTTOPLEFT = 13;
private const int HTTOPRIGHT = 14;
private const int HTBOTTOM = 15;
private const int HTBOTTOMLEFT = 16;
private const int HTBOTTOMRIGHT = 17;
private const int HTBORDER = 18;
private const int HTREDUCE = HTMINBUTTON;
private const int HTZOOM = HTMAXBUTTON;
private const int HTSIZEFIRST = HTLEFT;
private const int HTSIZELAST = HTBOTTOMRIGHT;
/* WINVER >= 0x0400 */
private const int HTOBJECT = 19;
private const int HTCLOSE = 20;
private const int HTHELP = 21;
/* WINVER >= 0x0400 */ private const int BorderWidth = 3;
private int CaptionHeight = 17; //可以调整窗体的大小和移动窗体的位置
protected override void WndProc(ref System.Windows.Forms.Message m)
{
switch(m.Msg)
{
case WM_NCHITTEST:
base.WndProc(ref m);
if (DesignMode)
{
return;
}
if ((int)m.Result == HTCLIENT)
{
m.HWnd = this.Handle;
int pLeft=0;
int pTop=0; bool IsControl = true;
if (IsControl)
{
if ((this.Parent as Form).FormBorderStyle==FormBorderStyle.None)
{
pLeft=this.Parent.Left;
pTop=this.Parent.Top;
}
else
{
pLeft=this.Parent.Left+2;
CaptionHeight = this.Parent.Height-this.Parent.ClientRectangle.Height-2 * BorderWidth;
pTop=this.Parent.Top + CaptionHeight + BorderWidth-2;
}
} if ((Cursor.Position.X<=pLeft + this.Left + BorderWidth) && (Cursor.Position.Y <= pTop + this.Top + BorderWidth))
m.Result = (IntPtr)HTTOPLEFT;//左上
else if ((Cursor.Position.X>=pLeft + this.Left + this.Width-BorderWidth) && (Cursor.Position.Y<=pTop + this.Top +BorderWidth))
m.Result = (IntPtr)HTTOPRIGHT;//右上
else if ((Cursor.Position.X <= pLeft + this.Left + BorderWidth) && (Cursor.Position.Y>=pTop + this.Top + this.Height-BorderWidth))
m.Result = (IntPtr)HTBOTTOMLEFT;//左下
else if ((Cursor.Position.X>=pLeft + this.Left + this.Width-BorderWidth) && (Cursor.Position.Y>=pTop + this.Top + this.Height-BorderWidth))
m.Result = (IntPtr)HTBOTTOMRIGHT;//右下
else if (Cursor.Position.X<=pLeft + this.Left + BorderWidth-1)
m.Result = (IntPtr)HTLEFT;//左
else if (Cursor.Position.X>=pLeft + this.Left + this.Width-BorderWidth)
m.Result = (IntPtr)HTRIGHT;//右
else if (Cursor.Position.Y<=pTop + this.Top + BorderWidth-1)
m.Result = (IntPtr)HTTOP;//上
else if (Cursor.Position.Y>=pTop + this.Top + this.Height-BorderWidth)
m.Result = (IntPtr)HTBOTTOM;//下
else //if (Cursor.Position.Y<=pTop + this.Top + CaptionHeight + BorderWidth )//在靠近上部可以托拽控件
{
//双击控件会全屏(不知道原因)
m.Result = (IntPtr)HTCAPTION;//移动控件
// if (Cursor.Position.X<=pLeft + this.Left + BorderWidth + CaptionHeight)
// {
// m.Result = (IntPtr)HTSYSMENU;
// }
// else
// {
// m.Result = (IntPtr)HTCAPTION;
// }
}
}
return;
default:
base.WndProc(ref m);
break;
}
}
}
/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
} #region Windows 窗体设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.textBox1 = new CusTextBox();
this.SuspendLayout();
//
// textBox1
//
this.textBox1.Location = new System.Drawing.Point(96, 88);
this.textBox1.Name = "textBox1";
this.textBox1.TabIndex = 0;
this.textBox1.Text = "textBox1";
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(536, 317);
this.Controls.Add(this.textBox1);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false); }
#endregion /// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
}
}
}