using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;


namespace QQFrm
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

#region 公共變量
IntPtr Tem_Handle;//獲取控件及窗體的句柄
Point CPoint;//獲取控件中鼠標的坐標
static int Tem_place = 0;
int Frm_Height = 0;
int FrmHeight = 0;

#endregion

#region API聲明
//獲取當前鼠標下可視化控件的句柄
[DllImport("user32.dll")]
public static extern int WindowFromPoint(int xPoint, int yPoint);
//獲取指定句柄的父級句柄
[DllImport("user32.dll", ExactSpelling = true, CharSet = CharSet.Auto)]
public static extern IntPtr GetParent(IntPtr hWnd);
//獲取屏幕的大小
[DllImport("user32.dll", EntryPoint = "GetSystemMetrics")]
private static extern int GetSystemMetrics(int mVal);
#endregion

#region 獲取當前鼠標下可視化控件的句柄
/// <summary>
/// 獲取當前鼠標下可視化控件的句柄
/// </summary>
/// <param x="int">當前鼠標的X坐標</param>
/// <param y="int">當前鼠標的Y坐標</param>
public IntPtr FormNameAt(int x, int y)
{
IntPtr Tem_hWnd;//設置存儲句柄的變量
Tem_Handle = (IntPtr)(WindowFromPoint(x, y));//獲取當前鼠標下可視化控件的句柄
Tem_hWnd = Tem_Handle;//記錄原始句柄
while (Tem_hWnd != ((IntPtr)0))//遍歷該句柄的父級句柄
{
Tem_Handle = Tem_hWnd;//記錄當前句柄
Tem_hWnd = GetParent(Tem_hWnd);//獲取父級句柄
}
return Tem_Handle;//返回最底層的父級句柄
}
#endregion


private void timer1_Tick(object sender, EventArgs e)
{
if (this.Top < 3 && Tem_place==0)//如果窗體被移到屏幕的頂部
{
if (this.Handle == FormNameAt(Cursor.Position.X, Cursor.Position.Y))//當鼠標移致到該窗體上
{
panel_Title.Tag = 1;//設置標識，用於判斷窗體在屏幕頂部
timer2.Enabled = false;//不對窗體進行拉伸操作
this.Top = 0;//使窗體致頂
}
else
{
panel_Title.Tag = 1;//設置標識，用於判斷窗體在屏幕頂部
timer2.Enabled = true;//將窗體在頂部進行隱藏
}
}
else
{
if (this.Left < 3 || this.Right > GetSystemMetrics(0) - 3)//如果窗體被移到屏幕的左端或右端
{
if (this.Left < 3)//如果窗體被移到屏幕的左端
{
if (this.Handle == FormNameAt(Cursor.Position.X, Cursor.Position.Y))//當鼠標移致到該窗體上
{
panel_Title.Tag = 2;//設置標識，用於判斷窗體在屏幕左端
timer2.Enabled = false;
Frm_Height = this.Height;
this.Left = 0;//使窗體致左
this.Top = 0;
this.Height = Screen.AllScreens[0].Bounds.Height;
Tem_place = 1;
}
else
{
panel_Title.Tag = 2;
timer2.Enabled = true;//將窗體在左端進行隱藏
}
}
if (this.Right > GetSystemMetrics(0) - 3)//如果窗體被移到屏幕的右端
{
if (this.Handle == FormNameAt(Cursor.Position.X, Cursor.Position.Y))//當鼠標移致到該窗體上
{
panel_Title.Tag = 3;//設置標識，用於判斷窗體在屏幕右端
timer2.Enabled = false;
Frm_Height = this.Height;
this.Left = GetSystemMetrics(0) - this.Width;//使窗體致右
this.Top = 0;
this.Height = Screen.AllScreens[0].Bounds.Height;
Tem_place = 1;
}
else
{
panel_Title.Tag = 3;
timer2.Enabled = true;//將窗體在右端進行隱藏
}
}

}
}

}

private void timer2_Tick(object sender, EventArgs e)
{
switch (Convert.ToInt16(panel_Title.Tag.ToString()))//對標識進行判斷
{
case 1://頂端隱藏
{
if (this.Top < 5)
this.Top = -(this.Height - 2);
break;
}
case 2://左端隱藏
{
if (this.Left < 5)
this.Left = -(this.Width - 2);
break;
}
case 3://右端隱藏
{
if ((this.Left + this.Width) > (GetSystemMetrics(0) - 5))
this.Left = GetSystemMetrics(0) - 2;
break;
}
}
}

private void panel1_Click(object sender, EventArgs e)
{
this.Close();
}

#region 利用窗體上的控件移動窗體
/// <summary>
/// 利用控件移動窗體
/// </summary>
/// <param Frm="Form">窗體</param>
/// <param e="MouseEventArgs">控件的移動事件</param>
public void FrmMove(Form Frm, MouseEventArgs e) //Form或MouseEventArgs添加命名空間using System.Windows.Forms;
{
if (e.Button == MouseButtons.Left)
{
Point myPosittion = Control.MousePosition;//獲取當前鼠標的屏幕坐標
myPosittion.Offset(CPoint.X, CPoint.Y);//重載當前鼠標的位置
Frm.DesktopLocation = myPosittion;//設置當前窗體在屏幕上的位置
Tem_place = 0;
this.Height = FrmHeight;
}
}
#endregion

private void panel_Title_MouseDown(object sender, MouseEventArgs e)
{
timer1.Enabled = false;
CPoint = new Point(-e.X, -e.Y);
}

private void panel_Title_MouseMove(object sender, MouseEventArgs e)
{
FrmMove(this, e);
}

private void panel_Title_MouseUp(object sender, MouseEventArgs e)
{
timer1.Enabled = true;
}

private void Form1_Load(object sender, EventArgs e)
{
Frm_Height = this.Height;
FrmHeight = this.Height;
this.TopMost = true;
}
}
}

C#窗體布局技巧