确保FloatLayerBase类在项目中~废话。源码在此: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; } } }}
FloatLayerBase.cs
在需要的地方使用它。关于使用,先看一下FloatLayerBase的部分公开成员://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);
上面4个属性都是跟边框有关的,边框总共有3种形态,三维、线型、无,由BorderType指定;当为三维形态时,由Border3DStyle指定具体样式;为线型时,由BorderSingleStyle和BorderColor分别指定具体线型和颜色。原Form.FormBorderStyle属性已被屏蔽,不允许子类访问,还有若干原Form的属性也已屏蔽,原因都在源码里。另外,原Form.SizeGripStyle照常使用,是否允许调整浮动层大小就靠它了
方法就说一下Show和ShowDialog,显然分别是用来非模式化/模式化显示浮动层的,两者在调用角度的重大区别就是,前者不会阻塞代码,后者则会,实际应用中根据情况选用。每个方法从参数又分Control和ToolStripItem两类,都是代表从什么控件上弹出浮动层的意思,前者接受Button、TextBox等控件(不能传入Form,后果会不愉快),后者接受工具栏上面的项目,例如ToolStripButton、ToolStripTextBox之类的。重载可以指定相对control或item的偏移位置,默认是在control/item的下方弹出浮动层。最后无论是Show还是ShowDialog弹出来的浮动层,都可以像右键菜单那样通过在其它地方点鼠标使之消失,这里需要说明一下:
- 鼠标只会点在本程序内的窗体中时,让浮动层消失。点在程序外的窗口、桌面、任务栏这些则不会。为什么要这样是因为要做到完全像右键菜单那样对全局鼠标敏感,需要全局钩子,这会增加代码量(性能且不说,没测过不妄言),而且我认为没必要全局敏感
- 浮动层消失是调用Hide方法,所以对于模式化打开的浮动层,会返回DialogResult.Cancel,这是.net对模式对话框的设计使然,模式对话框被Hide或Close时,就是返回Cancel。在此也提醒一下调用者,在使用模式对话框时,永远考虑有返回Cancel这种情况,不限于本例,而是所有对话框
原Show()/Show(IWin32Window)和ShowDialog()/ShowDialog(IWin32Window)已被屏蔽,原因见源码。