介绍一款C#中可携带附加消息的增强消息框（MessageBoxEx）

//静态属性
MessageBoxEx.EnableAnimate
MessageBoxEx.EnableSound

//静态方法
MessageBoxEx.Show(string, string, string)
MessageBoxEx.Show(string, string, string, MessageBoxButtons)
MessageBoxEx.Show(string, string, string, MessageBoxButtons, MessageBoxIcon)
MessageBoxEx.Show(string, string, string, MessageBoxButtons, MessageBoxIcon, MessageBoxDefaultButton)

MessageBoxEx.Show(string, string, Exception)
MessageBoxEx.Show(string, string, Exception, MessageBoxButtons)
MessageBoxEx.Show(string, string, Exception, MessageBoxButtons, MessageBoxIcon)
MessageBoxEx.Show(string, string, Exception, MessageBoxButtons, MessageBoxIcon, MessageBoxDefaultButton)

MessageBoxEx.Show("主消息", "标题", "附加消息", MessageBoxButtons.OK, MessageBoxIcon.None, MessageBoxDefaultButton.Button1);
MessageBoxEx.Show("主消息", "标题", ex, MessageBoxButtons.OK, MessageBoxIcon.None, MessageBoxDefaultButton.Button1);

MessageBoxEx.Show("阿斯顿发");
MessageBoxEx.Show("阿斯顿发", "士大夫");

using System;
using System.ComponentModel;
using System.Drawing;
using System.IO;
using System.Runtime.InteropServices;
using System.Threading;
using System.Windows.Forms;

namespace AhDung.WinForm
{
 /// <summary>
 /// 可以携带详细信息的消息框
 /// </summary>
 public static class MessageBoxEx
 {
 //异常消息文本
 private const string InvalidButtonExString = "按钮参数不是有效的枚举项！";
 private const string InvalidIconExString = "图标参数不是有效的枚举项！";
 private const string InvalidDfButtonExString = "默认按钮参数不是有效的枚举项！";

 /// <summary>
 /// 是否启用动画效果
 /// </summary>
 public static bool EnableAnimate { get; set; }

 /// <summary>
 /// 是否启用声音反馈
 /// </summary>
 public static bool EnableSound { get; set; }

 //静态构造
 static MessageBoxEx()
 {
  //默认启用动画+声音
  EnableAnimate = true;
  EnableSound = true;
 }

 #region 公开方法

 /// <summary>
 /// 显示消息框
 /// </summary>
 /// <param name="message">消息文本</param>
 /// <param name="caption">消息框标题</param>
 /// <param name="attachMessage">附加消息</param>
 public static DialogResult Show(string message, string caption = null, string attachMessage = null)
 {
  return ShowCore(message, caption, attachMessage, MessageBoxButtons.OK, MessageBoxIcon.None, MessageBoxDefaultButton.Button1);
 }

 /*下面这仨弄成重载而不是可选方法是为了避免不必要的参数检查*/

 /// <summary>
 /// 显示消息框
 /// </summary>
 /// <param name="message">消息文本</param>
 /// <param name="caption">消息框标题</param>
 /// <param name="attachMessage">附加消息</param>
 /// <param name="buttons">按钮组合</param>
 public static DialogResult Show(string message, string caption, string attachMessage, MessageBoxButtons buttons)
 {
  if (!Enum.IsDefined(typeof(MessageBoxButtons), buttons)) { throw new InvalidEnumArgumentException(InvalidButtonExString); }

  return ShowCore(message, caption, attachMessage, buttons, MessageBoxIcon.None, MessageBoxDefaultButton.Button1);
 }

 /// <summary>
 /// 显示消息框
 /// </summary>
 /// <param name="message">消息文本</param>
 /// <param name="caption">消息框标题</param>
 /// <param name="attachMessage">附加消息</param>
 /// <param name="buttons">按钮组合</param>
 /// <param name="icon">图标</param>
 public static DialogResult Show(string message, string caption, string attachMessage, MessageBoxButtons buttons, MessageBoxIcon icon)
 {
  if (!Enum.IsDefined(typeof(MessageBoxButtons), buttons)) { throw new InvalidEnumArgumentException(InvalidButtonExString); }
  if (!Enum.IsDefined(typeof(MessageBoxIcon), icon)) { throw new InvalidEnumArgumentException(InvalidIconExString); }

  return ShowCore(message, caption, attachMessage, buttons, icon, MessageBoxDefaultButton.Button1);
 }

 /// <summary>
 /// 显示消息框
 /// </summary>
 /// <param name="message">消息文本</param>
 /// <param name="caption">消息框标题</param>
 /// <param name="attachMessage">附加消息</param>
 /// <param name="buttons">按钮组合</param>
 /// <param name="icon">图标</param>
 /// <param name="defaultButton">默认按钮</param>
 public static DialogResult Show(string message, string caption, string attachMessage, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton)
 {
  if (!Enum.IsDefined(typeof(MessageBoxButtons), buttons)) { throw new InvalidEnumArgumentException(InvalidButtonExString); }
  if (!Enum.IsDefined(typeof(MessageBoxIcon), icon)) { throw new InvalidEnumArgumentException(InvalidIconExString); }
  if (!Enum.IsDefined(typeof(MessageBoxDefaultButton), defaultButton)) { throw new InvalidEnumArgumentException(InvalidDfButtonExString); }

  return ShowCore(message, caption, attachMessage, buttons, icon, defaultButton);
 }

 /********传入异常的重载********/

 /// <summary>
 /// 显示消息框
 /// </summary>
 /// <param name="message">消息文本</param>
 /// <param name="caption">消息框标题</param>
 /// <param name="exception">异常实例</param>
 public static DialogResult Show(string message, string caption, Exception exception)
 {
  return Show(message, caption, exception == null ? string.Empty : exception.ToString());
 }

 /// <summary>
 /// 显示消息框
 /// </summary>
 /// <param name="message">消息文本</param>
 /// <param name="caption">消息框标题</param>
 /// <param name="exception">异常实例</param>
 /// <param name="buttons">按钮组合</param>
 public static DialogResult Show(string message, string caption, Exception exception, MessageBoxButtons buttons)
 {
  return Show(message, caption, exception == null ? string.Empty : exception.ToString(), buttons);
 }

 /// <summary>
 /// 显示消息框
 /// </summary>
 /// <param name="message">消息文本</param>
 /// <param name="caption">消息框标题</param>
 /// <param name="exception">异常实例</param>
 /// <param name="buttons">按钮组合</param>
 /// <param name="icon">图标</param>
 public static DialogResult Show(string message, string caption, Exception exception, MessageBoxButtons buttons, MessageBoxIcon icon)
 {
  return Show(message, caption, exception == null ? string.Empty : exception.ToString(), buttons, icon);
 }

 /// <summary>
 /// 显示消息框
 /// </summary>
 /// <param name="message">消息文本</param>
 /// <param name="caption">消息框标题</param>
 /// <param name="exception">异常实例</param>
 /// <param name="buttons">按钮组合</param>
 /// <param name="icon">图标</param>
 /// <param name="defaultButton">默认按钮</param>
 public static DialogResult Show(string message, string caption, Exception exception, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton)
 {
  return Show(message, caption, exception == null ? string.Empty : exception.ToString(), buttons, icon, defaultButton);
 }

 #endregion

 //内部方法，不检查参数有效性
 private static DialogResult ShowCore(string message, string caption, string attachMessage, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton)
 {
  using (MessageForm f = new MessageForm(message, caption, buttons, icon, defaultButton, attachMessage, EnableAnimate, EnableSound))
  {
  return f.ShowDialog();
  }
 }

 /*----------------
  下面是消息窗体相关
  ---------------*/

 /// <summary>
 /// 消息窗体
 /// </summary>
 /// <remarks>参数有效性由MessageBoxEx负责</remarks>
 private class MessageForm : Form
 {
  /* todo 存在问题：
  * 当消息区文本非常非常多时，且反复进行改变消息框窗口大小、位置、展开收起的操作，那么在某次展开时
  详细信息文本框可能会在原位置（即消息区内某rect）瞬闪一下，
  原因是文本框控件在显示时总会在原位置WM_NCPAINT + WM_ERASEBKGND一下，暂无解决办法。
  实际应用中碰到的几率很小，就算碰到，影响也可以忽略。
  */

  #region 控件初始化

  /// <summary>
  /// 必需的设计器变量。
  /// </summary>
  private System.ComponentModel.IContainer components = null;

  /// <summary>
  /// 清理所有正在使用的资源。
  /// </summary>
  /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
  protected override void Dispose(bool disposing)
  {
  if (disposing && (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.button3 = new System.Windows.Forms.Button();
  this.txbAttach = new TextBoxUnSelectAllable();
  this.button2 = new System.Windows.Forms.Button();
  this.button1 = new System.Windows.Forms.Button();
  this.plButtonsZone = new AhDung.WinForm.MessageBoxEx.MessageForm.PanelBasic();
  this.ckbToggle = new AhDung.WinForm.MessageBoxEx.MessageForm.ToggleButton(this.UseAnimate);
  this.plAttachZone = new AhDung.WinForm.MessageBoxEx.MessageForm.PanelBasic();
  this.lbMsg = new AhDung.WinForm.MessageBoxEx.MessageForm.MessageViewer();
  this.plButtonsZone.SuspendLayout();
  this.plAttachZone.SuspendLayout();
  this.SuspendLayout();
  // 
  // button3
  // 
  this.button3.Anchor = System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right;
  this.button3.Location = new System.Drawing.Point(320, 8);
  this.button3.Margin = new System.Windows.Forms.Padding(3, 2, 3, 2);
  this.button3.Name = "button3";
  this.button3.Size = new System.Drawing.Size(85, 27);
  this.button3.TabIndex = 2;
  // 
  // txbAttach
  // 
  this.txbAttach.Anchor = ((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
      | System.Windows.Forms.AnchorStyles.Left)
      | System.Windows.Forms.AnchorStyles.Right;
  this.txbAttach.Location = new System.Drawing.Point(10, 7);
  this.txbAttach.Margin = new System.Windows.Forms.Padding(3, 1, 3, 1);
  this.txbAttach.Name = "txbAttach";
  this.txbAttach.ReadOnly = true;
  this.txbAttach.Multiline = true;
  this.txbAttach.ScrollBars = System.Windows.Forms.ScrollBars.Vertical;
  this.txbAttach.Size = new System.Drawing.Size(395, 105);
  this.txbAttach.TabIndex = 0;
  // 
  // button2
  // 
  this.button2.Anchor = System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right;
  this.button2.Location = new System.Drawing.Point(229, 8);
  this.button2.Margin = new System.Windows.Forms.Padding(3, 2, 3, 2);
  this.button2.Name = "button2";
  this.button2.Size = new System.Drawing.Size(85, 27);
  this.button2.TabIndex = 1;
  // 
  // button1
  // 
  this.button1.Anchor = System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right;
  this.button1.Location = new System.Drawing.Point(138, 8);
  this.button1.Margin = new System.Windows.Forms.Padding(3, 2, 3, 2);
  this.button1.Name = "button1";
  this.button1.Size = new System.Drawing.Size(85, 27);
  this.button1.TabIndex = 0;
  // 
  // plButtonsZone
  // 
  this.plButtonsZone.Controls.Add(this.ckbToggle);
  this.plButtonsZone.Controls.Add(this.button1);
  this.plButtonsZone.Controls.Add(this.button2);
  this.plButtonsZone.Controls.Add(this.button3);
  this.plButtonsZone.Dock = System.Windows.Forms.DockStyle.Bottom;
  this.plButtonsZone.Location = new System.Drawing.Point(0, 96);
  this.plButtonsZone.Margin = new System.Windows.Forms.Padding(3, 1, 3, 1);
  this.plButtonsZone.Name = "plButtonsZone";
  this.plButtonsZone.Size = new System.Drawing.Size(415, 36);
  this.plButtonsZone.TabIndex = 1;
  // 
  // ckbToggle
  // 
  this.ckbToggle.Location = new System.Drawing.Point(10, 8);
  this.ckbToggle.Name = "ckbToggle";
  this.ckbToggle.Size = new System.Drawing.Size(93, 27);
  this.ckbToggle.TabIndex = 3;
  this.ckbToggle.Text = "详细信息(&D)";
  this.ckbToggle.CheckedChanged += this.ckbToggle_CheckedChanged;
  // 
  // plAttachZone
  // 
  this.plAttachZone.Controls.Add(this.txbAttach);
  this.plAttachZone.Dock = System.Windows.Forms.DockStyle.Fill;
  this.plAttachZone.Location = new System.Drawing.Point(0, 130);
  this.plAttachZone.Margin = new System.Windows.Forms.Padding(3, 2, 3, 2);
  this.plAttachZone.Name = "plAttachZone";
  this.plAttachZone.Size = new System.Drawing.Size(415, 114);
  this.plAttachZone.TabIndex = 2;
  this.plAttachZone.Visible = false;
  // 
  // lbMsg
  // 
  this.lbMsg.Dock = System.Windows.Forms.DockStyle.Fill;
  this.lbMsg.Icon = null;
  this.lbMsg.Location = new System.Drawing.Point(0, 0);
  this.lbMsg.Name = "lbMsg";
  this.lbMsg.Padding = new System.Windows.Forms.Padding(21, 18, 21, 18);
  //this.lbMsg.Size = new System.Drawing.Size(415, 96);
  this.lbMsg.TabIndex = 0;
  // 
  // FmMsg
  // 
  this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.None;
  //this.ClientSize = new System.Drawing.Size(415, 261);
  this.Controls.Add(this.lbMsg);
  this.Controls.Add(this.plButtonsZone);
  this.Controls.Add(this.plAttachZone);
  this.DoubleBuffered = true;
  this.MaximizeBox = false;
  this.Name = "MessageForm";
  this.Padding = new System.Windows.Forms.Padding(0, 0, 0, 17);
  this.ShowIcon = false;
  this.ShowInTaskbar = false;
  this.SizeGripStyle = System.Windows.Forms.SizeGripStyle.Show;
  this.plButtonsZone.ResumeLayout(false);
  this.plAttachZone.ResumeLayout(false);
  this.plAttachZone.PerformLayout();
  this.ResumeLayout(false);
  }

  #endregion

  private ToggleButton ckbToggle;
  private TextBoxUnSelectAllable txbAttach;
  private MessageViewer lbMsg;
  private System.Windows.Forms.Button button2;
  private System.Windows.Forms.Button button1;
  private PanelBasic plButtonsZone;
  private PanelBasic plAttachZone;
  private System.Windows.Forms.Button button3;

  #endregion

  /// <summary>
  /// 最大默认窗体客户区宽度
  /// </summary>
  const int MaxClientWidth = 700;

  string messageSound;//存储供PlaySound API使用的系统消息音别名，在ProcessIcon中赋值，OnShown中取用

  int expandHeight;
  /// <summary>
  /// 详细信息区展开高度
  /// </summary>
  private int ExpandHeight
  {
  get { return expandHeight < 150 ? 150 : expandHeight; }
  set { expandHeight = value; }
  }

  #region 属性

  /// <summary>
  /// 是否启用动画效果
  /// </summary>
  /// <remarks>此处还弄该属性是为了保证窗体类的独立性</remarks>
  private bool UseAnimate { get; set; }

  /// <summary>
  /// 是否启用声音反馈
  /// </summary>
  /// <remarks>此处还弄该属性是为了保证窗体类的独立性</remarks>
  private bool UseSound { get; set; }

  /// <summary>
  /// 消息按钮
  /// </summary>
  private MessageBoxButtons MessageButtons { get; set; }

  /// <summary>
  /// 消息图标
  /// </summary>
  private MessageBoxIcon MessageIcon { get; set; }

  /// <summary>
  /// 默认按钮
  /// </summary>
  private MessageBoxDefaultButton DefaultButton { get; set; }

  #endregion

  /// <summary>
  /// 创建消息窗体
  /// </summary>
  private MessageForm(bool enableAnimate)
  {
  this.UseAnimate = enableAnimate;//须尽早设置，要供展开按钮初始化用
  InitializeComponent();
  this.StartPosition = Form.ActiveForm == null ? FormStartPosition.CenterScreen : FormStartPosition.CenterParent;
  this.Font = SystemFonts.MessageBoxFont;

  //注册事件
  this.button1.Click += button_Click;
  this.button2.Click += button_Click;
  this.button3.Click += button_Click;
  this.plAttachZone.Resize += plAttachZone_Resize;
  }

  /// <summary>
  /// 创建消息窗体
  /// </summary>
  public MessageForm(string message, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton, string attachMessage, bool enableAnimate, bool enableSound)
  : this(enableAnimate)
  {
  this.lbMsg.Text = message;
  this.Text = caption;
  this.txbAttach.Text = attachMessage;
  this.MessageButtons = buttons;
  this.MessageIcon = icon;
  this.DefaultButton = defaultButton;
  this.UseSound = enableSound;
  }

  #region 重写基类方法

  protected override void OnLoad(EventArgs e)
  {
  //须在计算各种尺寸前搞掂
  ProcessIcon();
  ProcessButtons();

  this.MinimumSize = SizeFromClientSize(new Size(GetPanelButtonMinWidth(), GetClientMinHeight()));

  //参数意义定为客户区最大大小，所以需刨掉非客户区高度后传入
  this.ClientSize = this.GetPreferredSize(new Size(MaxClientWidth, Screen.PrimaryScreen.WorkingArea.Height - (this.Height - this.ClientSize.Height)));

  base.OnLoad(e);
  }

  protected override void OnShown(EventArgs e)
  {
  //设置默认按钮焦点。须在OnShown中设置按钮焦点才有用
  Button dfBtn;
  if ((dfBtn = this.AcceptButton as Button) != null)
  {
   dfBtn.Focus();
  }

  //播放消息提示音
  if (this.UseSound) { PlaySystemSound(this.messageSound); }

  base.OnShown(e);
  }

  //重写窗体参数
  protected override CreateParams CreateParams
  {
  get
  {
   CreateParams prms = base.CreateParams;

   if ((Convert.ToInt32(this.MessageButtons) & 1) == 0) //没有Cancel按钮时屏蔽关闭按钮，刚好在偶数项
   {
   prms.ClassStyle |= 0x200;
   }

   return prms;
  }
  }

  /// <summary>
  /// 计算合适的窗口尺寸
  /// </summary>
  /// <param name="proposedSize">该参数此处定义为客户区可设置的最大尺寸</param>
  public override Size GetPreferredSize(Size proposedSize)
  {
  int reservedHeight = plButtonsZone.Height + Padding.Bottom;
  Size size = lbMsg.GetPreferredSize(new Size(proposedSize.Width, proposedSize.Height - reservedHeight));
  size.Height += reservedHeight;
  return size;
  }

  #endregion

  #region 事件处理方法

  //展开收起
  private void ckbToggle_CheckedChanged(object sender, EventArgs e)
  {
  this.SuspendLayout();

  if (ckbToggle.Checked)
  {
   plButtonsZone.SendToBack();
   lbMsg.SendToBack();

   lbMsg.Dock = DockStyle.Top;
   plButtonsZone.Dock = DockStyle.Top;

   ChangeFormHeight(ExpandHeight);
   plAttachZone.Visible = true;
  }
  else
  {
   ExpandHeight = plAttachZone.Height;//为再次展开记忆高度
   plAttachZone.Visible = false;
   ChangeFormHeight(-plAttachZone.Height);//收起时直接取pl高度，不要取ExpandHeight

   plButtonsZone.SendToBack();

   plButtonsZone.Dock = DockStyle.Bottom;
   lbMsg.Dock = DockStyle.Fill;
  }

  this.ResumeLayout();
  }

  //按钮事件
  private void button_Click(object sender, EventArgs e)
  {
  this.DialogResult = (DialogResult)((sender as Button).Tag);
  }

  //用户手工收完详细区则触发折叠
  private void plAttachZone_Resize(object sender, EventArgs e)
  {
  if (ckbToggle.Checked && plAttachZone.Height == 0)
  {
   ckbToggle.Checked = false;
  }
  }

  #endregion

  #region 辅助+私有方法

  /// <summary>
  /// 处理按钮相关
  /// </summary>
  private void ProcessButtons()
  {
  this.ckbToggle.Visible = txbAttach.Text.Trim().Length != 0; //无详细信息就不显示展开按钮

  int btnCount = 3; //按钮数量

  switch (MessageButtons) //老实用case，可读点
  {
   case MessageBoxButtons.AbortRetryIgnore:
   button1.Text = "中止(&A)"; button1.Tag = DialogResult.Abort;
   button2.Text = "重试(&R)"; button2.Tag = DialogResult.Retry;
   button3.Text = "忽略(&I)"; button3.Tag = DialogResult.Ignore;
   break;
   case MessageBoxButtons.OK:
   button1.Visible = false;
   button2.Visible = false;
   button3.Text = "确定"; button3.Tag = DialogResult.OK;
   btnCount = 1;
   break;
   case MessageBoxButtons.OKCancel:
   button1.Visible = false;
   button2.Text = "确定"; button2.Tag = DialogResult.OK;
   button3.Text = "取消"; button3.Tag = DialogResult.Cancel;
   btnCount = 2;
   break;
   case MessageBoxButtons.RetryCancel:
   button1.Visible = false;
   button2.Text = "重试(&R)"; button2.Tag = DialogResult.Retry;
   button3.Text = "取消"; button3.Tag = DialogResult.Cancel;
   btnCount = 2;
   break;
   case MessageBoxButtons.YesNo:
   button1.Visible = false;
   button2.Text = "是(&Y)"; button2.Tag = DialogResult.Yes;
   button3.Text = "否(&N)"; button3.Tag = DialogResult.No;
   btnCount = 2;
   break;
   case MessageBoxButtons.YesNoCancel:
   button1.Text = "是(&Y)"; button1.Tag = DialogResult.Yes;
   button2.Text = "否(&N)"; button2.Tag = DialogResult.No;
   button3.Text = "取消"; button3.Tag = DialogResult.Cancel;
   break;
   default: break;
  }

  //仅有OK和有取消按钮时设CancelButton
  if ((int)MessageButtons == 0 || ((int)MessageButtons & 1) == 1)
  {
   this.CancelButton = button3;
  }

  //处理默认按钮
  if (btnCount == 1)
  {
   this.AcceptButton = button3;
  }
  else if (btnCount == 2)
  {
   this.AcceptButton = DefaultButton == MessageBoxDefaultButton.Button2 ? button3 : button2;
  }
  else
  {
   Button[] btnArray = { button1, button2, button3 };
   this.AcceptButton = btnArray[Convert.ToInt32(DefaultButton) / 0x100];
  }
  }

  /// <summary>
  /// 处理图标（含声音）
  /// </summary>
  private void ProcessIcon()
  {
  switch (MessageIcon)
  {
   //MessageBoxIcon.Information同样
   case MessageBoxIcon.Asterisk:
   lbMsg.Icon = SystemIcons.Information;
   messageSound = "SystemAsterisk";
   break;

   //MessageBoxIcon.Hand、MessageBoxIcon.Stop同样
   case MessageBoxIcon.Error:
   lbMsg.Icon = SystemIcons.Error;
   messageSound = "SystemHand";
   break;

   //MessageBoxIcon.Warning同样
   case MessageBoxIcon.Exclamation:
   lbMsg.Icon = SystemIcons.Warning;
   messageSound = "SystemExclamation";
   break;

   case MessageBoxIcon.Question:
   lbMsg.Icon = SystemIcons.Question;
   messageSound = "SystemAsterisk";//Question原本是没声音的，此实现让它蹭一下Information的
   break;

   default: //MessageBoxIcon.None
   lbMsg.Icon = null;
   messageSound = "SystemDefault";
   break;
  }
  }

  /// <summary>
  /// 计算窗体客户区最小高度
  /// </summary>
  private int GetClientMinHeight()
  {
  return lbMsg.MinimumHeight + plButtonsZone.Height + Padding.Bottom;
  }

  /// <summary>
  /// 计算按钮区最小宽度
  /// </summary>
  private int GetPanelButtonMinWidth()
  {
  int r = 20 /*左右Padding*/, visibleCount = -1 /*因为两个以上才会有间距*/;

  if (ckbToggle.Visible) { r += ckbToggle.Width; visibleCount++; }
  if (button1.Visible) { r += button1.Width * 3; visibleCount += 3; }
  else if (button2.Visible) { r += button2.Width * 2; visibleCount += 2; }
  else { r += button3.Width; visibleCount++; }

  if (visibleCount != -1) { r += visibleCount * 6; } //按钮间距

  return r;
  }

  /// <summary>
  /// 改变窗体高度。内部有动画处理
  /// </summary>
  /// <param name="increment">增量（负数即为减小高度）</param>
  private void ChangeFormHeight(int increment)
  {
  int finalHeight = this.Height + increment; //正确的目标高度

  if (!this.UseAnimate) //不使用动画
  {
   this.Height = finalHeight;
   return;
  }

  const int step = 8; //帧数

  for (int i = 0; i < step; i++)
  {
   if (i == step - 1) //最后一步直达目标
   {
   this.Height = finalHeight;
   return;
   }

   this.Height += increment / step;

   Application.DoEvents(); //必要
   Thread.Sleep(10);
  }
  }

  /// <summary>
  /// 播放系统事件声音
  /// </summary>
  /// <remarks>之所以不用MessageBeep API是因为这货在srv08上不出声，所以用PlaySound代替</remarks>
  private static void PlaySystemSound(string soundAlias)
  {
  PlaySound(soundAlias, IntPtr.Zero, 0x10000 /*SND_ALIAS*/| 0x1 /*SND_ASYNC*/);
  }

  [DllImport("winmm.dll", CharSet = CharSet.Auto)]
  private static extern bool PlaySound([MarshalAs(UnmanagedType.LPWStr)] string soundName, IntPtr hmod, int soundFlags);

  #endregion

  #region 嵌套类

  /// <summary>
  /// 基础面板
  /// </summary>
  private class PanelBasic : Control
  {
  public PanelBasic()
  {
   SetStyle(ControlStyles.AllPaintingInWmPaint, false);//关键，不然其上的ToolBar不正常
   SetStyle(ControlStyles.OptimizedDoubleBuffer, true);//重要。不设置的话控件绘制不正常
   SetStyle(ControlStyles.ContainerControl, true);
   SetStyle(ControlStyles.Selectable, false);
  }

  protected override void WndProc(ref Message m)
  {
   //屏蔽WM_ERASEBKGND。防止显示时在原位置快闪
   //不能通过ControlStyles.AllPaintingInWmPaint=true屏蔽
   //会影响其上的ToolBar
   if (m.Msg == 0x14) { return; }

   base.WndProc(ref m);
  }

  protected override void SetBoundsCore(int x, int y, int width, int height, BoundsSpecified specified)
  {
   //防Dock时面板短暂滞留在原位置
   base.SetBoundsCore(x, y, width, height, specified | BoundsSpecified.Y | BoundsSpecified.Width);
  }
  }

  /// <summary>
  /// 消息呈现控件
  /// </summary>
  private class MessageViewer : Control
  {
  const TextFormatFlags textFlags = TextFormatFlags.EndEllipsis //未完省略号
       | TextFormatFlags.WordBreak //允许换行
       | TextFormatFlags.NoPadding //无边距
       | TextFormatFlags.ExternalLeading //行间空白。NT5必须，不然文字挤在一起
       | TextFormatFlags.TextBoxControl; //避免半行

  const int IconSpace = 5; //图标与文本间距

  const float PreferredScale = 13;//最佳文本区块比例（宽/高）

  /// <summary>
  /// 最小高度。不要重写MinimumSize，那会在窗体移动和缩放时都会执行
  /// </summary>
  public int MinimumHeight
  {
   get
   {
   return (this.Icon != null ? Math.Max(this.Icon.Height, this.FontHeight) : this.FontHeight) + Padding.Vertical;
   }
  }

  /// <summary>
  /// 获取或设置图标
  /// </summary>
  public Icon Icon { get; set; }

  public MessageViewer()
  {
   this.SetStyle(ControlStyles.CacheText, true);
   this.SetStyle(ControlStyles.UserPaint, true);
   this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
   this.SetStyle(ControlStyles.Selectable, false);
   this.SetStyle(ControlStyles.ResizeRedraw, true); //重要

   this.DoubleBuffered = true; //双缓冲
   BackColor = Environment.OSVersion.Version.Major == 5 ? SystemColors.Control : Color.White;
  }

  //防Dock改变尺寸
  protected override void SetBoundsCore(int x, int y, int width, int height, BoundsSpecified specified)
  {
   base.SetBoundsCore(x, y, width, height, specified | BoundsSpecified.Size);
  }

  /// <summary>
  /// 计算合适的消息区尺寸
  /// </summary>
  /// <param name="proposedSize">该参数此处定义为此控件可设置的最大尺寸</param>
  /// <remarks>该方法对太长的单行文本有做比例优化处理，避免用户摆头幅度过大扭到脖子</remarks>
  public override Size GetPreferredSize(Size proposedSize)
  {
   if (proposedSize.Width < 10) { proposedSize.Width = int.MaxValue; }
   if (proposedSize.Height < 10) { proposedSize.Height = int.MaxValue; }

   int reservedWidth = Padding.Horizontal + (this.Icon == null ? 0 : (this.Icon.Width + IconSpace));

   Size wellSize = Size.Empty;
   if (!string.IsNullOrEmpty(this.Text))
   {
   //优化文本块宽高比例
   Size size = TextRenderer.MeasureText(this.Text, this.Font, new Size(proposedSize.Width - reservedWidth, 0), textFlags);//用指定宽度测量文本面积
   wellSize = Convert.ToSingle(size.Width) / size.Height > PreferredScale //过于宽扁的情况
    ? Size.Ceiling(GetSameSizeWithNewScale(size, PreferredScale))
    : size;

   //凑齐整行高，确保尾行显示
   int lineHeight = TextRenderer.MeasureText(" ", this.Font, new Size(int.MaxValue, 0), textFlags).Height;//单行高，Font.Height不靠谱
   int differ;
   wellSize.Height += (differ = wellSize.Height % lineHeight) == 0 ? 0 : (lineHeight - differ);
   }
   if (this.Icon != null)
   {
   wellSize.Width += this.Icon.Width + IconSpace;
   wellSize.Height = Math.Max(this.Icon.Height, wellSize.Height);
   }
   wellSize += Padding.Size;

   //不应超过指定尺寸。宽度在上面已确保不会超过
   if (wellSize.Height > proposedSize.Height) { wellSize.Height = proposedSize.Height; }

   return wellSize;
  }

  /// <summary>
  /// 重绘
  /// </summary>
  protected override void OnPaint(PaintEventArgs e)
  {
   Graphics g = e.Graphics;
   Rectangle rect = GetPaddedRectangle();

   //绘制图标
   if (this.Icon != null)
   {
   g.DrawIcon(this.Icon, Padding.Left, Padding.Top);

   //右移文本区
   rect.X += this.Icon.Width + IconSpace;
   rect.Width -= this.Icon.Width + IconSpace;

   //若文字太少，则与图标垂直居中
   if (this.Text.Length < 100)
   {
    Size textSize = TextRenderer.MeasureText(g, this.Text, this.Font, rect.Size, textFlags);
    if (textSize.Height <= this.Icon.Height)
    {
    rect.Y += (this.Icon.Height - textSize.Height) / 2;
    }
   }
   }

   //g.FillRectangle(Brushes.Gainsboro, rect);//test

   //绘制文本
   TextRenderer.DrawText(g, this.Text, this.Font, rect, Color.Black, textFlags);

   base.OnPaint(e);
  }

  /// <summary>
  /// 根据原尺寸，得到相同面积、且指定比例的新尺寸
  /// </summary>
  /// <param name="src">原尺寸</param>
  /// <param name="scale">新尺寸比例。需是width/height</param>
  private static SizeF GetSameSizeWithNewScale(Size src, float scale)
  {
   int sqr = src.Width * src.Height;//原面积
   double w = Math.Sqrt(sqr * scale);//新面积宽
   return new SizeF(Convert.ToSingle(w), Convert.ToSingle(sqr / w));
  }

  /// <summary>
  /// 获取刨去Padding的内容区
  /// </summary>
  private Rectangle GetPaddedRectangle()
  {
   Rectangle r = this.ClientRectangle;
   r.X += this.Padding.Left;
   r.Y += this.Padding.Top;
   r.Width -= this.Padding.Horizontal;
   r.Height -= this.Padding.Vertical;
   return r;
  }
  }

  /// <summary>
  /// 屏蔽全选消息的文本框
  /// </summary>
  private class TextBoxUnSelectAllable : TextBox
  {
  protected override void WndProc(ref Message m)
  {
   //EM_SETSEL
   if (m.Msg == 0xB1) { return; }

   base.WndProc(ref m);
  }
  }

  /// <summary>
  /// 包装ToolBarButton为单一控件
  /// </summary>
  private class ToggleButton : Control
  {
  /// <summary>
  /// 展开/收起图标数据
  /// </summary>
  const string ImgDataBase64 =
@"iVBORw0KGgoAAAANSUhEUgAAACAAAAAQCAYAAAB3AH1ZAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJ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";

  readonly bool isToggleMode;
  bool isChecked;
  bool useAnimate;
  readonly ImageList imgList;

  /// <summary>
  /// Checked改变后
  /// </summary>
  public event EventHandler CheckedChanged;

  /// <summary>
  /// 使用动画按钮效果
  /// </summary>
  private bool UseAnimate
  {
   get { return useAnimate; }
   set
   {
   if (useAnimate == value) { return; }

   useAnimate = value;
   if (IsHandleCreated) { this.CreateHandle(); }
   }
  }

  /// <summary>
  /// 获取或设置按钮是否处于按下状态
  /// </summary>
  [Description("获取或设置按钮是否处于按下状态"), DefaultValue(false)]
  public bool Checked
  {
   get
   {
   if (IsHandleCreated)
   {
    //保证isChecked与实情吻合。TB_ISBUTTONCHECKED
    isChecked = Convert.ToBoolean(SendMessage(this.Handle, 0x40A, IntPtr.Zero, IntPtr.Zero).ToInt32());
   }
   return isChecked;
   }
   set
   {
   if (isChecked == value || !isToggleMode) { return; }

   isChecked = value;

   if (IsHandleCreated)
   {
    //TB_CHECKBUTTON
    SendMessage(this.Handle, 0x402, IntPtr.Zero, new IntPtr(Convert.ToInt32(value)));
   }

   OnCheckedChanged(EventArgs.Empty);
   }
  }

  /// <summary>
  /// 创建ToolBarButtonControl
  /// </summary>
  public ToggleButton(bool useAnimate)
  {
   SetStyle(ControlStyles.UserPaint, false);
   SetStyle(ControlStyles.AllPaintingInWmPaint, true);
   SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
   SetStyle(ControlStyles.ResizeRedraw, true);

   this.isToggleMode = true;//写死好了，独立版才提供设置
   this.UseAnimate = useAnimate;

   //将图标加入imageList
   imgList = new ImageList { ImageSize = new System.Drawing.Size(16, 16), ColorDepth = ColorDepth.Depth32Bit };
   using (MemoryStream ms = new MemoryStream(Convert.FromBase64String(ImgDataBase64)))
   {
   imgList.Images.AddStrip(Image.FromStream(ms));
   }
  }

  /// <summary>
  /// 执行左键单击
  /// </summary>
  public void PerformClick()
  {
   SendMessage(this.Handle, 0x201, new IntPtr(0x1), IntPtr.Zero);//WM_LBUTTONDOWN
   Application.DoEvents();
   SendMessage(this.Handle, 0x202, IntPtr.Zero, IntPtr.Zero); //WM_LBUTTONUP
  }

  protected override void WndProc(ref Message m)
  {
   //忽略鼠标双击消息，WM_LBUTTONDBLCLK
   if (m.Msg == 0x203) { return; }

   //有节操的响应鼠标动作
   if ((m.Msg == 0x201 || m.Msg == 0x202) && (!this.Enabled || !this.Visible))
   {
   return;
   }
   base.WndProc(ref m);
  }

  //创建ToolBar
  protected override CreateParams CreateParams
  {
   get
   {
   CreateParams prms = base.CreateParams;
   prms.ClassName = "ToolbarWindow32";
   prms.Style = 0x40000000
    | 0x10000000
    //| 0x2000000 //WS_CLIPCHILDREN
    //| 0x8000
    | 0x1
    | 0x4
    | 0x8
    | 0x40
    | 0x1000 //TBSTYLE_LIST，图标文本横排
    ;
   if (UseAnimate) { prms.Style |= 0x800; }//TBSTYLE_FLAT。flat模式在NT6.x下，按钮按下会有动画效果

   prms.ExStyle = 0;

   return prms;
   }
  }

  protected override void OnHandleCreated(EventArgs e)
  {
   base.OnHandleCreated(e);

   //设置imgList
   SendMessage(this.Handle, 0x430, IntPtr.Zero, imgList.Handle);//TB_SETIMAGELIST

   //准备添加按钮
   int btnStructSize = Marshal.SizeOf(typeof(TBBUTTON));
   SendMessage(this.Handle, 0x41E, new IntPtr(btnStructSize), IntPtr.Zero);//TB_BUTTONSTRUCTSIZE，必须在添加按钮前

   //构建按钮信息
   TBBUTTON btnStruct = new TBBUTTON
   {
   //iBitmap = 0,
   //idCommand = 0,
   fsState = 0x4, //TBSTATE_ENABLED
   iString = SendMessage(this.Handle, 0x44D, 0, this.Text + &#39;\0&#39;)//TB_ADDSTRING
   };
   if (this.isToggleMode) { btnStruct.fsStyle = 0x2; }//BTNS_CHECK。作为切换按钮时

   IntPtr btnStructStart = IntPtr.Zero;
   try
   {
   btnStructStart = Marshal.AllocHGlobal(btnStructSize);//在非托管区创建一个指针
   Marshal.StructureToPtr(btnStruct, btnStructStart, true);//把结构体塞到上述指针

   //添加按钮
   SendMessage(this.Handle, 0x444, new IntPtr(1)/*按钮数量*/, btnStructStart);//TB_ADDBUTTONS。从指针取按钮信息

   //设置按钮尺寸刚好为ToolBar尺寸
   AdjustButtonSize();
   }
   finally
   {
   if (btnStructStart != IntPtr.Zero) { Marshal.FreeHGlobal(btnStructStart); }
   }
  }

  protected override bool ProcessCmdKey(ref Message m, Keys keyData)
  {
   //将空格和回车作为鼠标单击处理
   if (m.Msg == 0x100 && (keyData == Keys.Enter || keyData == Keys.Space))
   {
   PerformClick();
   return true;
   }

   return base.ProcessCmdKey(ref m, keyData);
  }

  /// <summary>
  /// 处理助记键
  /// </summary>
  protected override bool ProcessMnemonic(char charCode)
  {
   if (IsMnemonic(charCode, this.Text))
   {
   PerformClick();
   return true;
   }

   return base.ProcessMnemonic(charCode);
  }

  protected override void OnClick(EventArgs e)
  {
   //忽略鼠标右键
   MouseEventArgs me = e as MouseEventArgs;
   if (me != null && me.Button != System.Windows.Forms.MouseButtons.Left)
   { return; }

   //若是切换模式，直接引发Checked事件（不要通过设置Checked属性引发，因为OnClick发送之前就已经Check了）
   //存在理论上的不可靠，但暂无更好办法
   if (isToggleMode)
   { this.OnCheckedChanged(EventArgs.Empty); }

   base.OnClick(e);
  }

  //重绘后重设按钮尺寸
  protected override void OnInvalidated(InvalidateEventArgs e)
  {
   base.OnInvalidated(e);
   AdjustButtonSize();
  }

  /// <summary>
  /// 引发CheckedChanged事件
  /// </summary>
  protected virtual void OnCheckedChanged(EventArgs e)
  {
   SetImageIndex(this.Checked ? 1 : 0);

   if (CheckedChanged != null) { CheckedChanged(this, e); }
  }

  /// <summary>
  /// 设置图标索引
  /// </summary>
  private void SetImageIndex(int index)
  {
   //TB_CHANGEBITMAP
   SendMessage(this.Handle, 0x42B, IntPtr.Zero, new IntPtr(index));
  }

  /// <summary>
  /// 调整按钮尺寸刚好为ToolBar尺寸
  /// </summary>
  private void AdjustButtonSize()
  {
   IntPtr lParam = new IntPtr((this.Width & 0xFFFF) | (this.Height << 0x10)); //MakeLParam手法
   SendMessage(this.Handle, 0x41F, IntPtr.Zero, lParam); //TB_SETBUTTONSIZE
  }

  #region Win32 API

  [DllImport("user32.dll", CharSet = CharSet.Auto)]
  private static extern IntPtr SendMessage(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam);

  [DllImport("user32.dll", CharSet = CharSet.Auto)]
  private static extern IntPtr SendMessage(IntPtr hWnd, int msg, int wParam, string lParam);

  [StructLayout(LayoutKind.Sequential)]
  private struct TBBUTTON
  {
   public int iBitmap;
   public int idCommand;
   public byte fsState;
   public byte fsStyle;
   public byte bReserved0;
   public byte bReserved1;
   public IntPtr dwData;
   public IntPtr iString;
  }

  #endregion
  }

  #endregion
 }
 }
}