.net2.0+ Winform项目实现弹出容器层

using System;using System.ComponentModel;using System.Drawing;using System.Runtime.InteropServices;using System.Windows.Forms;namespace AhDung.WinForm.Controls{  /// <summary>  /// 浮动层基类  /// </summary>  public class FloatLayerBase : Form  {    /// <summary>    /// 鼠标消息筛选器    /// </summary>    //由于本窗体为WS_CHILD，所以不会收到在窗体以外点击鼠标的消息    //该消息筛选器的作用就是让本窗体获知鼠标点击情况，进而根据鼠标是否在本窗体以外的区域点击，做出相应处理    readonly AppMouseMessageHandler _mouseMsgFilter;    /// <summary>    /// 指示本窗体是否已ShowDialog过    /// </summary>    //由于多次ShowDialog会使OnLoad/OnShown重入，故需设置此标记以供重入时判断    bool _isShowDialogAgain;    //边框相关字段    BorderStyle _borderType;    Border3DStyle _border3DStyle;    ButtonBorderStyle _borderSingleStyle;    Color _borderColor;    /// <summary>    /// 获取或设置边框类型    /// </summary>    [Description("获取或设置边框类型。")]    [DefaultValue(BorderStyle.Fixed3D)]    public BorderStyle BorderType    {      get { return _borderType; }      set      {        if (_borderType == value) { return; }        _borderType = value;        Invalidate();      }    }    /// <summary>    /// 获取或设置三维边框样式    /// </summary>    [Description("获取或设置三维边框样式。")]    [DefaultValue(Border3DStyle.RaisedInner)]    public Border3DStyle Border3DStyle    {      get { return _border3DStyle; }      set      {        if (_border3DStyle == value) { return; }        _border3DStyle = value;        Invalidate();      }    }    /// <summary>    /// 获取或设置线型边框样式    /// </summary>    [Description("获取或设置线型边框样式。")]    [DefaultValue(ButtonBorderStyle.Solid)]    public ButtonBorderStyle BorderSingleStyle    {      get { return _borderSingleStyle; }      set      {        if (_borderSingleStyle == value) { return; }        _borderSingleStyle = value;        Invalidate();      }    }    /// <summary>    /// 获取或设置边框颜色（仅当边框类型为线型时有效）    /// </summary>    [Description("获取或设置边框颜色（仅当边框类型为线型时有效）。")]    [DefaultValue(typeof(Color), "DarkGray")]    public Color BorderColor    {      get { return _borderColor; }      set      {        if (_borderColor == value) { return; }        _borderColor = value;        Invalidate();      }    }    protected override sealed CreateParams CreateParams    {      get      {        CreateParams prms = base.CreateParams;        //prms.Style = 0;        //prms.Style |= -2147483648;  //WS_POPUP        prms.Style |= 0x40000000;   //WS_CHILD 重要，只有CHILD窗体才不会抢父窗体焦点        prms.Style |= 0x4000000;    //WS_CLIPSIBLINGS        prms.Style |= 0x10000;     //WS_TABSTOP        prms.Style &= ~0x40000;    //WS_SIZEBOX    去除        prms.Style &= ~0x800000;    //WS_BORDER    去除        prms.Style &= ~0x400000;    //WS_DLGFRAME   去除        //prms.Style &= ~0x20000;   //WS_MINIMIZEBOX  去除        //prms.Style &= ~0x10000;   //WS_MAXIMIZEBOX  去除        prms.ExStyle = 0;        //prms.ExStyle |= 0x1;     //WS_EX_DLGMODALFRAME 立体边框        //prms.ExStyle |= 0x8;     //WS_EX_TOPMOST        prms.ExStyle |= 0x10000;    //WS_EX_CONTROLPARENT        //prms.ExStyle |= 0x80;    //WS_EX_TOOLWINDOW        //prms.ExStyle |= 0x100;    //WS_EX_WINDOWEDGE        //prms.ExStyle |= 0x8000000;  //WS_EX_NOACTIVATE        //prms.ExStyle |= 0x4;     //WS_EX_NOPARENTNOTIFY        return prms;      }    }    //构造函数    public FloatLayerBase()    {      //初始化消息筛选器。添加和移除在显示/隐藏时负责      _mouseMsgFilter = new AppMouseMessageHandler(this);      //初始化基类属性      InitBaseProperties();      //初始化边框相关      _borderType = BorderStyle.Fixed3D;      _border3DStyle = System.Windows.Forms.Border3DStyle.RaisedInner;      _borderSingleStyle = ButtonBorderStyle.Solid;      _borderColor = Color.DarkGray;    }    protected override void OnLoad(EventArgs e)    {      //防止重入      if (_isShowDialogAgain) { return; }      //需得减掉两层边框宽度，运行时尺寸才与设计时完全相符，原因不明      //确定与ControlBox、FormBorderStyle有关，但具体联系不明      if (!DesignMode)      {        Size size = SystemInformation.FrameBorderSize;        this.Size -= size + size;//不可以用ClientSize，后者会根据窗口风格重新调整Size      }      base.OnLoad(e);    }    protected override void OnShown(EventArgs e)    {      //防止重入      if (_isShowDialogAgain) { return; }      //在OnShown中为首次ShowDialog设标记      if (Modal) { _isShowDialogAgain = true; }      if (!DesignMode)      {        //激活首控件        Control firstControl;        if ((firstControl = GetNextControl(this, true)) != null)        {          firstControl.Focus();        }      }      base.OnShown(e);    }    protected override void WndProc(ref Message m)    {      //当本窗体作为ShowDialog弹出时，在收到WM_SHOWWINDOW前，Owner会被Disable      //故需在收到该消息后立即Enable它，不然Owner窗体和本窗体都将处于无响应状态      if (m.Msg == 0x18 && m.WParam != IntPtr.Zero && m.LParam == IntPtr.Zero        && Modal && Owner != null && !Owner.IsDisposed)      {        if (Owner.IsMdiChild)        {          //当Owner是MDI子窗体时，被Disable的是MDI主窗体          //并且Parent也会指向MDI主窗体，故需改回为Owner，这样弹出窗体的Location才会相对于Owner而非MDIParent          NativeMethods.EnableWindow(Owner.MdiParent.Handle, true);          NativeMethods.SetParent(this.Handle, Owner.Handle);//只能用API设置Parent，因为模式窗体是TopLevel，.Net拒绝为顶级窗体设置Parent        }        else        {          NativeMethods.EnableWindow(Owner.Handle, true);        }      }      base.WndProc(ref m);    }    //画边框    protected override void OnPaintBackground(PaintEventArgs e)    {      base.OnPaintBackground(e);      if (_borderType == BorderStyle.Fixed3D)//绘制3D边框      {        ControlPaint.DrawBorder3D(e.Graphics, ClientRectangle, Border3DStyle);      }      else if (_borderType == BorderStyle.FixedSingle)//绘制线型边框      {        ControlPaint.DrawBorder(e.Graphics, ClientRectangle, BorderColor, BorderSingleStyle);      }    }    //显示后添加鼠标消息筛选器以开始捕捉，隐藏时则移除筛选器。之所以不放Dispose中是想尽早移除筛选器    protected override void OnVisibleChanged(EventArgs e)    {      if (!DesignMode)      {        if (Visible) { Application.AddMessageFilter(_mouseMsgFilter); }        else { Application.RemoveMessageFilter(_mouseMsgFilter); }      }      base.OnVisibleChanged(e);    }    //实现窗体客户区拖动    //在WndProc中实现这个较麻烦，所以放到这里做    protected override void OnMouseDown(MouseEventArgs e)    {      //让鼠标点击客户区时达到与点击标题栏一样的效果，以此实现客户区拖动      NativeMethods.ReleaseCapture();      NativeMethods.SendMessage(Handle, 0xA1/*WM_NCLBUTTONDOWN*/, (IntPtr)2/*CAPTION*/, IntPtr.Zero);      base.OnMouseDown(e);    }    /// <summary>    /// 显示为模式窗体    /// </summary>    /// <param name="control">显示在该控件下方</param>    public DialogResult ShowDialog(Control control)    {      return ShowDialog(control, 0, control.Height);    }    /// <summary>    /// 显示为模式窗体    /// </summary>    /// <param name="control">触发弹出窗体的控件</param>    /// <param name="offsetX">相对control水平偏移</param>    /// <param name="offsetY">相对control垂直偏移</param>    public DialogResult ShowDialog(Control control, int offsetX, int offsetY)    {      return ShowDialog(control, new Point(offsetX, offsetY));    }    /// <summary>    /// 显示为模式窗体    /// </summary>    /// <param name="control">触发弹出窗体的控件</param>    /// <param name="offset">相对control偏移</param>    public DialogResult ShowDialog(Control control, Point offset)    {      return this.ShowDialogInternal(control, offset);    }    /// <summary>    /// 显示为模式窗体    /// </summary>    /// <param name="item">显示在该工具栏项的下方</param>    public DialogResult ShowDialog(ToolStripItem item)    {      return ShowDialog(item, 0, item.Height);    }    /// <summary>    /// 显示为模式窗体    /// </summary>    /// <param name="item">触发弹出窗体的工具栏项</param>    /// <param name="offsetX">相对item水平偏移</param>    /// <param name="offsetY">相对item垂直偏移</param>    public DialogResult ShowDialog(ToolStripItem item, int offsetX, int offsetY)    {      return ShowDialog(item, new Point(offsetX, offsetY));    }    /// <summary>    /// 显示为模式窗体    /// </summary>    /// <param name="item">触发弹出窗体的工具栏项</param>    /// <param name="offset">相对item偏移</param>    public DialogResult ShowDialog(ToolStripItem item, Point offset)    {      return this.ShowDialogInternal(item, offset);    }    /// <summary>    /// 显示窗体    /// </summary>    /// <param name="control">显示在该控件下方</param>    public void Show(Control control)    {      Show(control, 0, control.Height);    }    /// <summary>    /// 显示窗体    /// </summary>    /// <param name="control">触发弹出窗体的控件</param>    /// <param name="offsetX">相对control水平偏移</param>    /// <param name="offsetY">相对control垂直偏移</param>    public void Show(Control control, int offsetX, int offsetY)    {      Show(control, new Point(offsetX, offsetY));    }    /// <summary>    /// 显示窗体    /// </summary>    /// <param name="control">触发弹出窗体的控件</param>    /// <param name="offset">相对control偏移</param>    public void Show(Control control, Point offset)    {      this.ShowInternal(control, offset);    }    /// <summary>    /// 显示窗体    /// </summary>    /// <param name="item">显示在该工具栏下方</param>    public void Show(ToolStripItem item)    {      Show(item, 0, item.Height);    }    /// <summary>    /// 显示窗体    /// </summary>    /// <param name="item">触发弹出窗体的工具栏项</param>    /// <param name="offsetX">相对item水平偏移</param>    /// <param name="offsetY">相对item垂直偏移</param>    public void Show(ToolStripItem item, int offsetX, int offsetY)    {      Show(item, new Point(offsetX, offsetY));    }    /// <summary>    /// 显示窗体    /// </summary>    /// <param name="item">触发弹出窗体的工具栏项</param>    /// <param name="offset">相对item偏移</param>    public void Show(ToolStripItem item, Point offset)    {      this.ShowInternal(item, offset);    }    /// <summary>    /// ShowDialog内部方法    /// </summary>    private DialogResult ShowDialogInternal(Component controlOrItem, Point offset)    {      //快速连续弹出本窗体将有可能遇到尚未Hide的情况下再次弹出，这会引发异常，故需做处理      if (this.Visible) { return System.Windows.Forms.DialogResult.None; }      this.SetLocationAndOwner(controlOrItem, offset);      return base.ShowDialog();    }    /// <summary>    /// Show内部方法    /// </summary>    private void ShowInternal(Component controlOrItem, Point offset)    {      if (this.Visible) { return; }//原因见ShowDialogInternal      this.SetLocationAndOwner(controlOrItem, offset);      base.Show();    }    /// <summary>    /// 设置坐标及所有者    /// </summary>    /// <param name="controlOrItem">控件或工具栏项</param>    /// <param name="offset">相对偏移</param>    private void SetLocationAndOwner(Component controlOrItem, Point offset)    {      Point pt = Point.Empty;      if (controlOrItem is ToolStripItem)      {        ToolStripItem item = (ToolStripItem)controlOrItem;        pt.Offset(item.Bounds.Location);        controlOrItem = item.Owner;      }      Control c = (Control)controlOrItem;      pt.Offset(GetControlLocationInForm(c));      pt.Offset(offset);      this.Location = pt;      //设置Owner属性与Show[Dialog](Owner)有不同，当Owner是MDIChild时，后者会改Owner为MDIParent      this.Owner = c.FindForm();    }    /// <summary>    /// 获取控件在窗体中的坐标    /// </summary>    private static Point GetControlLocationInForm(Control c)    {      Point pt = c.Location;      while (!((c = c.Parent) is Form))      {        pt.Offset(c.Location);      }      return pt;    }    #region 屏蔽对本类影响重大的基类方法和属性    /// <summary>    /// 初始化部分基类属性    /// </summary>    private void InitBaseProperties()    {      base.ControlBox = false;              //重要      //必须得是SizableToolWindow才能支持调整大小的同时，不受SystemInformation.MinWindowTrackSize的限制      base.FormBorderStyle = System.Windows.Forms.FormBorderStyle.SizableToolWindow;      base.Text = string.Empty;             //重要      base.HelpButton = false;      base.Icon = null;      base.IsMdiContainer = false;      base.MaximizeBox = false;      base.MinimizeBox = false;      base.ShowIcon = false;      base.ShowInTaskbar = false;      base.StartPosition = FormStartPosition.Manual;   //重要      base.TopMost = false;      base.WindowState = FormWindowState.Normal;    }    //屏蔽原方法    [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]    [Obsolete("请使用别的重载！", true)]    public new DialogResult ShowDialog() { throw new NotImplementedException(); }    [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]    [Obsolete("请使用别的重载！", true)]    public new DialogResult ShowDialog(IWin32Window owner) { throw new NotImplementedException(); }    [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]    [Obsolete("请使用别的重载！", true)]    public new void Show() { throw new NotImplementedException(); }    [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]    [Obsolete("请使用别的重载！", true)]    public new void Show(IWin32Window owner) { throw new NotImplementedException(); }    //屏蔽原属性    [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]    [Obsolete("禁用该属性！", true)]    public new bool ControlBox { get { return false; } set { } }    [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]    [Obsolete("设置边框请使用Border相关属性！", true)]    public new FormBorderStyle FormBorderStyle { get { return System.Windows.Forms.FormBorderStyle.SizableToolWindow; } set { } }    [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]    [Obsolete("禁用该属性！", true)]    public override sealed string Text { get { return string.Empty; } set { } }    [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]    [Obsolete("禁用该属性！", true)]    public new bool HelpButton { get { return false; } set { } }    [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]    [Obsolete("禁用该属性！", true)]    public new Image Icon { get { return null; } set { } }    [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]    [Obsolete("禁用该属性！", true)]    public new bool IsMdiContainer { get { return false; } set { } }    [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]    [Obsolete("禁用该属性！", true)]    public new bool MaximizeBox { get { return false; } set { } }    [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]    [Obsolete("禁用该属性！", true)]    public new bool MinimizeBox { get { return false; } set { } }    [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]    [Obsolete("禁用该属性！", true)]    public new bool ShowIcon { get { return false; } set { } }    [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]    [Obsolete("禁用该属性！", true)]    public new bool ShowInTaskbar { get { return false; } set { } }    [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]    [Obsolete("禁用该属性！", true)]    public new FormStartPosition StartPosition { get { return FormStartPosition.Manual; } set { } }    [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]    [Obsolete("禁用该属性！", true)]    public new bool TopMost { get { return false; } set { } }    [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]    [Obsolete("禁用该属性！", true)]    public new FormWindowState WindowState { get { return FormWindowState.Normal; } set { } }    #endregion    /// <summary>    /// 程序鼠标消息筛选器    /// </summary>    private class AppMouseMessageHandler : IMessageFilter    {      readonly FloatLayerBase _layerForm;      public AppMouseMessageHandler(FloatLayerBase layerForm)      {        _layerForm = layerForm;      }      public bool PreFilterMessage(ref Message m)      {        //如果在本窗体以外点击鼠标，隐藏本窗体        //若想在点击标题栏、滚动条等非客户区也要让本窗体消失，取消0xA1的注释即可        //本例是根据坐标判断，亦可以改为根据句柄，但要考虑子孙控件        //之所以用API而不用Form.DesktopBounds是因为后者不可靠        if ((m.Msg == 0x201/*|| m.Msg==0xA1*/)          && _layerForm.Visible && !NativeMethods.GetWindowRect(_layerForm.Handle).Contains(MousePosition))        {          _layerForm.Hide();//之所以不Close是考虑应该由调用者负责销毁        }        return false;      }    }    /// <summary>    /// API封装类    /// </summary>    private static class NativeMethods    {      [DllImport("user32.dll")]      [return: MarshalAs(UnmanagedType.Bool)]      public static extern bool EnableWindow(IntPtr hWnd, bool bEnable);      [DllImport("user32.dll", CharSet = CharSet.Auto)]      public static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);      [DllImport("user32.dll")]      public static extern bool ReleaseCapture();      [DllImport("user32.dll", SetLastError = true)]      public static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent);      [DllImport("user32.dll", SetLastError = true)]      private static extern bool GetWindowRect(IntPtr hwnd, out RECT lpRect);      [StructLayout(LayoutKind.Sequential)]      private struct RECT      {        public int left;        public int top;        public int right;        public int bottom;        public static explicit operator Rectangle(RECT rect)        {          return new Rectangle(rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top);        }      }      public static Rectangle GetWindowRect(IntPtr hwnd)      {        RECT rect;        GetWindowRect(hwnd, out rect);        return (Rectangle)rect;      }    }  }}

//属性public BorderStyle BorderType { get; set; }public Border3DStyle Border3DStyle { get; set; }public ButtonBorderStyle BorderSingleStyle { get; set; }public Color BorderColor { get; set; }//方法public void Show(Control control);public void Show(Control control, Point offset);public void Show(Control control, int offsetX, int offsetY);public void Show(ToolStripItem item);public void Show(ToolStripItem item, Point offset);public void Show(ToolStripItem item, int offsetX, int offsetY);public DialogResult ShowDialog(Control control);public DialogResult ShowDialog(Control control, Point offset);public DialogResult ShowDialog(Control control, int offsetX, int offsetY);public DialogResult ShowDialog(ToolStripItem item);public DialogResult ShowDialog(ToolStripItem item, Point offset);public DialogResult ShowDialog(ToolStripItem item, int offsetX, int offsetY);