你想过为自己的程序添加靠边隐藏的功能吗？还在为计算窗体的大小及位置而烦恼吗？想这么简单的轻松调用吗？

DockWindow.FormDockTemplate m_oDockFormTemplate = new DockWindow.FormDockTemplate(this);

不用吃惊，您只需要在你的窗体初始化的时候（也就是窗体构造函数里添加上述这一行代码）您的程序就可以轻松拥有靠边自动隐藏的功能。

下面我就给各位共享一个我自己经常用的靠边停靠的窗体类，详细见如下代码：

FormDockTemplate.cs文件：

using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Windows.Forms;

namespace DockWindow
{
public class FormDockTemplate : NativeWindow
{
#region 私有字段
/// <summary>
/// 父级窗口实例
/// </summary>
private Form parentForm = null;
/// <summary>
/// 窗口实例的启动信息
/// </summary>
private FormStartInfo m_oFormStartInfo = null;
/// <summary>
/// 当前窗口可以停靠的方式
/// </summary>
private Enu_FormDockStyle m_iDockStyle = Enu_FormDockStyle.None;
/// <summary>
/// 窗口停靠检测的定时器
/// </summary>
private Timer m_tmrHideWindow = null;
/// <summary>
/// 自动感知的矩形区域
/// </summary>
private Rectangle m_rcLeft = Rectangle.Empty;
private Rectangle m_rcTop = Rectangle.Empty;
private Rectangle m_rcRight = Rectangle.Empty;
private Rectangle m_rcBottom = Rectangle.Empty;
/// <summary>
/// 感知区域的容差值，也就是当鼠标移动进入距边缘几个象素时进行自动捕获
/// </summary>
private int m_iSensitiveAreaTolerantPixel = 4;
#endregion

#region 字段属性
/// <summary>
/// 当前窗口的鼠标位置
/// </summary>
Point CurrentMousePos
{
get
{
//获取当前鼠标的屏幕坐标
User32.POINT ptMousePos = new User32.POINT();
User32.GetCursorPos(ref ptMousePos);
return new Point(ptMousePos.X, ptMousePos.Y);
}
}

Rectangle FormTitleRect
{
get { return new Rectangle(parentForm.Location, new Size(parentForm.Width, parentForm.Height - parentForm.ClientRectangle.Height)); }
}

/// <summary>
/// 感应区域的容差设置，距离屏幕边缘多少象素时，开始自动感知
/// </summary>
public int TolerantPixel
{
get { return m_iSensitiveAreaTolerantPixel; }
set { m_iSensitiveAreaTolerantPixel = value; }
}
#endregion

#region 构造函数
/// <summary>
/// 构造函数
/// </summary>
/// <param name="frmParent">父窗口对象</param>
public FormDockTemplate(Form frmParent)
: this(frmParent, 4)
{
}

/// <summary>
/// 构造函数
/// </summary>
/// <param name="frmParent">父窗口对象</param>
/// <param name="iTolerantPixel">自动感知容差象素（当Mouse距离屏幕边缘多少象素时自动感知）</param>
public FormDockTemplate(Form frmParent, int iTolerantPixel)
{
m_iSensitiveAreaTolerantPixel = iTolerantPixel;
parentForm = frmParent;
parentForm.HandleCreated += new EventHandler(parentForm_HandleCreated);
parentForm.HandleDestroyed += new EventHandler(parentForm_HandleDestroyed);
parentForm.Load += new EventHandler(parentForm_Load);
parentForm.Move += new EventHandler(parentForm_Move);
parentForm.Resize += new EventHandler(parentForm_Resize);

//初始化窗体的启动信息：如上次关闭时窗体的大小及位置
InitialFormStartInfo();
}

/// <summary>
/// 初始化窗体启动信息，通过反序列化完成
/// </summary>
void InitialFormStartInfo()
{
try
{
m_oFormStartInfo = new FormStartInfo(parentForm);
FormStartInfo.Deserialize(ref m_oFormStartInfo);
}
catch
{
m_oFormStartInfo.FormLocation = parentForm.Location;
m_oFormStartInfo.FormSize = new Size(parentForm.Width, parentForm.Height);
}
}
#endregion

#region 窗体事件处理
void parentForm_Load(object sender, EventArgs e)
{
//初始化感知区域
InitialDockArea();

//初始化时设置窗口大小及位置
parentForm.Location = m_oFormStartInfo.FormLocation;
parentForm.Size = m_oFormStartInfo.FormSize;

//定时器初始化
m_tmrHideWindow = new Timer();
m_tmrHideWindow.Interval = 100;
m_tmrHideWindow.Enabled = true;
m_tmrHideWindow.Tick += new EventHandler(m_tmrHideWindow_Tick);
}

void parentForm_Resize(object sender, EventArgs e)
{
m_oFormStartInfo.FormSize = parentForm.Size;
}

void parentForm_Move(object sender, EventArgs e)
{
//当左键按下时并且当前鼠标位置处于窗口标题栏区域内，则认为是合法窗口移动，启用自动感知功能
if (Control.MouseButtons == MouseButtons.Left && FormTitleRect.Contains(CurrentMousePos))
{
SetFormDockPos();
}
}

void parentForm_HandleDestroyed(object sender, EventArgs e)
{
//销毁定时器
m_tmrHideWindow.Enabled = false;
m_tmrHideWindow.Stop();
m_tmrHideWindow.Dispose();

//窗口关闭时，保存窗口的大小位置及停靠信息
if (m_iDockStyle == Enu_FormDockStyle.None)
{
m_oFormStartInfo.FormLocation = parentForm.Location;
m_oFormStartInfo.FormSize = parentForm.Size;
}
FormStartInfo.Serialize(m_oFormStartInfo);

//释放本类关联的窗口句柄
ReleaseHandle();
}

void parentForm_HandleCreated(object sender, EventArgs e)
{
AssignHandle(((Form)sender).Handle);
}

void m_tmrHideWindow_Tick(object sender, EventArgs e)
{
if (m_oFormStartInfo.DockStyle != Enu_FormDockStyle.None)
{
//为了提升显示效率，只有处于如下两种情况时，才需要重新显示窗体
//1、窗体可见但鼠标已经移出窗体外
//2、窗体不可见但鼠标已经移入窗体内
bool bNeedReshow = (m_oFormStartInfo.FormVisible && IsMouseOutForm()) ||
(!m_oFormStartInfo.FormVisible && !IsMouseOutForm());
if (bNeedReshow)
m_oFormStartInfo.ShowDockWindow(parentForm.Handle, !IsMouseOutForm());
}
}
#endregion

#region 私有函数
private void InitialDockArea()
{
//获取屏幕可用区域
User32.RECT rectWorkArea = new User32.RECT();
User32.SystemParametersInfo((uint)User32.Enu_SystemParametersInfo_Action.SPI_GETWORKAREA, 0, ref rectWorkArea, 0);
Rectangle rcWorkArea = new Rectangle(rectWorkArea.left, rectWorkArea.top, rectWorkArea.right - rectWorkArea.left, rectWorkArea.bottom - rectWorkArea.top);
Rectangle rcScreenArea = Screen.PrimaryScreen.Bounds;

//容差值，表示鼠标移动到边界若干象素里即可以自动感知停靠位置
m_rcLeft = new Rectangle(rcWorkArea.Left, rcWorkArea.Top, m_iSensitiveAreaTolerantPixel, rcWorkArea.Height);
m_rcTop = new Rectangle(rcWorkArea.Left, rcWorkArea.Top, rcWorkArea.Width, m_iSensitiveAreaTolerantPixel);
m_rcRight = new Rectangle(rcWorkArea.Width - rcWorkArea.Left - m_iSensitiveAreaTolerantPixel, rcWorkArea.Top, m_iSensitiveAreaTolerantPixel, rcWorkArea.Height);
m_rcBottom = new Rectangle(rcScreenArea.Left, rcScreenArea.Bottom - rcScreenArea.Top - m_iSensitiveAreaTolerantPixel, rcScreenArea.Width, m_iSensitiveAreaTolerantPixel);
}

/// <summary>
/// 鼠标按下时未放开的时候，设置窗体停靠时的位置
/// </summary>
void SetFormDockPos()
{
m_iDockStyle = Enu_FormDockStyle.None;

//根据不同的停靠方式来重置窗体位置
if (m_rcLeft.Contains(CurrentMousePos))
{
parentForm.Location = m_rcLeft.Location;
parentForm.Height = m_rcLeft.Height;

m_iDockStyle = Enu_FormDockStyle.Left;
}
else if (m_rcTop.Contains(CurrentMousePos))
{
parentForm.Location = new Point(parentForm.Location.X, m_rcTop.Top);

m_iDockStyle = Enu_FormDockStyle.Top;
}
else if (m_rcRight.Contains(CurrentMousePos))
{
parentForm.Location = new Point(m_rcRight.Right - parentForm.Width, m_rcRight.Top);
parentForm.Height = m_rcRight.Height;

m_iDockStyle = Enu_FormDockStyle.Right;
}
else if (m_rcBottom.Contains(CurrentMousePos))
{
parentForm.Location = new Point(parentForm.Location.X, m_rcBottom.Bottom - parentForm.Height);

m_iDockStyle = Enu_FormDockStyle.Bottom;
}

m_oFormStartInfo.DockStyle = m_iDockStyle;
m_oFormStartInfo.FormLocation = parentForm.Location;
}

/// <summary>
/// 表明当前鼠标位置是否已经移出窗体外
/// </summary>
/// <returns></returns>
private bool IsMouseOutForm()
{
//获取当前鼠标的屏幕坐标
User32.POINT ptMousePos = new User32.POINT();
User32.GetCursorPos(ref ptMousePos);
Point ptClientCursor = new Point(ptMousePos.X, ptMousePos.Y);

User32.RECT rcFormClient = new User32.RECT();
User32.GetWindowRect(this.Handle, ref rcFormClient);
Rectangle rcFormBound = new Rectangle(rcFormClient.left, rcFormClient.top, rcFormClient.right - rcFormClient.left, rcFormClient.bottom - rcFormClient.top);
return !rcFormBound.Contains(ptClientCursor);
}
#endregion
}
}

下面这个类是负责隐藏或显示窗体，并计算其位置和保存窗体的大小及位置

FormStartInfo.cs 文件：

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Drawing;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;
using System.Windows.Forms;

namespace DockWindow
{
public enum Enu_FormDockStyle
{
None = 0,
Left = 1,
Top = 2,
Right = 3,
Bottom = 4,
}

[Serializable]
public class FormStartInfo
{
[NonSerialized]
private Form m_frmDockWindow = null;
private string m_strSerialFileName = string.Empty;
private Size m_szFormSize = Size.Empty;
private Point m_ptFormLocation = Point.Empty;
private Enu_FormDockStyle m_iDockStyle = Enu_FormDockStyle.None;
private bool m_bFormVisible = false;

/// <summary>
/// 构造函数
/// </summary>
/// <param name="frmItem">停靠的窗体对象</param>
public FormStartInfo(Form frmItem)
{
try
{
m_frmDockWindow = frmItem;

if (null == frmItem) m_strSerialFileName = "StartInfo.dat";
else m_strSerialFileName = frmItem.Name + frmItem.Text + "_StartInfo.dat";
}
catch { }
}

/// <summary>
/// 窗体大小
/// </summary>
public Size FormSize
{
get { return m_szFormSize; }
internal set { m_szFormSize = value; }
}

/// <summary>
/// 窗体位置坐标
/// </summary>
public Point FormLocation
{
get { return m_ptFormLocation; }
internal set { m_ptFormLocation = value; }
}

/// <summary>
/// 停靠方式
/// </summary>
public Enu_FormDockStyle DockStyle
{
get { return m_iDockStyle; }
internal set { m_iDockStyle = value; }
}

/// <summary>
/// 表示窗体是否自动隐藏
/// </summary>
public bool FormVisible
{
get { return m_bFormVisible; }
}
/// <summary>
/// 序列化此类的实例信息
/// </summary>
/// <param name="frmStartInfo"></param>
public static void Serialize(FormStartInfo frmStartInfo)
{
using (FileStream fs = new FileStream(frmStartInfo.m_strSerialFileName, FileMode.OpenOrCreate))
{
BinaryFormatter bf = new BinaryFormatter();
bf.Serialize(fs, frmStartInfo);
}
}

/// <summary>
/// 反序列化此类的实例信息
/// </summary>
/// <param name="frmStartInfo"></param>
public static void Deserialize(ref FormStartInfo frmStartInfo)
{
FormStartInfo frmTemp = null;

if (null == frmStartInfo) return;
using (FileStream fs = new FileStream(frmStartInfo.m_strSerialFileName, FileMode.Open))
{
BinaryFormatter bf = new BinaryFormatter();
frmTemp = (FormStartInfo)bf.Deserialize(fs);
if (null != frmTemp) frmStartInfo = frmTemp;
}
}
/// <summary>
/// 显示或隐藏停靠窗口
/// </summary>
public void ShowDockWindow(IntPtr hwnd, bool bVisible)
{
Point ptLocation = Point.Empty;
Size szFormSize = Size.Empty;

m_bFormVisible = bVisible;

if (m_frmDockWindow == null) m_frmDockWindow = (Form)Control.FromHandle(hwnd);
if (m_frmDockWindow == null) return;

GetDockWindowClientRect(ref ptLocation, ref szFormSize, bVisible);

m_frmDockWindow.TopMost = (m_iDockStyle != Enu_FormDockStyle.None);
m_frmDockWindow.Location = ptLocation;
m_frmDockWindow.Width = szFormSize.Width;
m_frmDockWindow.Height = szFormSize.Height;
}
/// <summary>
/// 根据当前窗体的停靠方式来计算出当前窗体的大小及位置
/// </summary>
/// <param name="ptLocation">窗体位置</param>
/// <param name="szFormSize">窗体大小</param>
/// <param name="bDockWindowVisible">显示还是隐藏</param>
private void GetDockWindowClientRect(ref Point ptLocation, ref Size szFormSize, bool bDockWindowVisible)
{
int iTorrentPixel = 0;
int iWindowTitleHeight = SystemInformation.CaptionHeight;

//获取屏幕可用区域
User32.RECT rectWorkArea = new User32.RECT();
User32.SystemParametersInfo((uint)User32.Enu_SystemParametersInfo_Action.SPI_GETWORKAREA, 0, ref rectWorkArea, 0);
Rectangle rcWorkArea = new Rectangle(rectWorkArea.left, rectWorkArea.top, rectWorkArea.right - rectWorkArea.left, rectWorkArea.bottom - rectWorkArea.top);
Rectangle rcScreenArea = Screen.PrimaryScreen.Bounds;

if (m_ptFormLocation.X < 0) m_ptFormLocation.X = 0;
if (m_ptFormLocation.Y < 0) m_ptFormLocation.Y = 0;

if (!bDockWindowVisible)
{
switch (m_iDockStyle)
{
case Enu_FormDockStyle.None:
ptLocation = m_ptFormLocation;
szFormSize = m_szFormSize;
break;
case Enu_FormDockStyle.Left:
ptLocation = new Point(m_ptFormLocation.X - m_szFormSize.Width + SystemInformation.FrameBorderSize.Width + iTorrentPixel, rcWorkArea.Top);
szFormSize = new Size(m_szFormSize.Width, rcWorkArea.Height);
break;
case Enu_FormDockStyle.Top:
ptLocation = new Point(m_ptFormLocation.X, rcWorkArea.Top - m_szFormSize.Height +SystemInformation.FrameBorderSize.Width + iTorrentPixel);
szFormSize = m_szFormSize;
break;
case Enu_FormDockStyle.Right:
ptLocation = new Point(rcWorkArea.Width - rcWorkArea.Left - SystemInformation.FrameBorderSize.Width - iTorrentPixel, rcWorkArea.Top);
szFormSize = new Size(m_szFormSize.Width, rcWorkArea.Height);
break;
case Enu_FormDockStyle.Bottom:
ptLocation = new Point(m_ptFormLocation.X, rcScreenArea.Bottom - rcScreenArea.Top - SystemInformation.FrameBorderSize.Width - iTorrentPixel);
szFormSize = m_szFormSize;
break;
default:
ptLocation = m_ptFormLocation;
szFormSize = m_szFormSize;
break;
}
}
else
{
ptLocation = m_ptFormLocation;
szFormSize = m_szFormSize;
}
}
}
}

下面在贴上在此过程中引用的一些API函数：

User32.cs文件：