文章来自 https://www.cnblogs.com/ahdung/p/FloatLayerBase.html
每天进步一点点
新建类 FloatLayerBase 继承Form,
自己有点小改动public void Show(Control control, Point endPoint) 添加参数 endPoint 避免窗体在最右边或下边时弹出窗体被遮掩。
public partial 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;
}
}
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);
//InitializeComponent();
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, Point endPoint)
{
return ShowDialog(control, 0, control.Height, endPoint);
}
/// <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, Point endPoint)
{
return ShowDialog(control, new Point(offsetX, offsetY), endPoint);
}
/// <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, Point endPoint)
{
return this.ShowDialogInternal(control, offset, endPoint);
}
/// <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, Point endPoint)
{
return ShowDialog(item, 0, item.Height, endPoint);
}
/// <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, Point endPoint)
{
return ShowDialog(item, new Point(offsetX, offsetY), endPoint);
}
/// <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, Point endPoint)
{
return this.ShowDialogInternal(item, offset, endPoint);
}
/// <summary>
/// 显示窗体
/// </summary>
/// <param name="control">显示在该控件下方</param>
public void Show(Control control, Point endPoint)
{
Show(control, 0, control.Height,endPoint);
}
/// <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, Point endPoint)
{
Show(control, new Point(offsetX, offsetY), endPoint);
}
/// <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, Point endPoint)
{
this.ShowInternal(control, offset, endPoint);
}
/// <summary>
/// 显示窗体
/// </summary>
/// <param name="item">显示在该工具栏下方</param>
public void Show(ToolStripItem item, Point endPoint)
{
Show(item, 0, item.Height, endPoint);
}
/// <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, Point endPoint)
{
Show(item, new Point(offsetX, offsetY),endPoint);
}
/// <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, Point endPoint)
{
this.ShowInternal(item, offset, endPoint);
}
/// <summary>
/// ShowDialog内部方法
/// </summary>
private DialogResult ShowDialogInternal(Component controlOrItem, Point offset, Point endPoint)
{
//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, endPoint);
return base.ShowDialog();
}
/// <summary>
/// Show内部方法
/// </summary>
private void ShowInternal(Component controlOrItem, Point offset, Point endPoint)
{
if (this.Visible) { return; }//原因见ShowDialogInternal
this.SetLocationAndOwner(controlOrItem, offset, endPoint);
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 endPoint)
{
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);
if (pt.X + this.RestoreBounds.Width > endPoint.X)//右边超出界面
{
pt.X = pt.X + c.Width - this.RestoreBounds.Width;
}
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;
//Control c1 = c.Parent;
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;
}
//[DllImport("user32.dll", ExactSpelling = true)]
//public static extern IntPtr GetAncestor(IntPtr hwnd, uint flags);
}
}
1 添加用户控件UserControl1继承FloatLayerBase
2 调用代码
public FloatLayerBase CreateLayer(Type type, out bool isShow)
{
//考虑到初始化体验爽滑，不用反射
FloatLayerBase layer = null;
if (type == typeof(UserControl1)) { layer = new UserControl1(); } }
LayerFormOption opts = LayerOption;
isShow = opts.IsShow;
layer.BorderType = opts.BorderType;
layer.Border3DStyle = opts.Border3DStyle;
layer.BorderSingleStyle = opts.BorderSingleStyle;
layer.BorderColor = opts.BorderColor;
return layer;
}
public void PopupLayer(Type type, object sender)
{
Control c = sender as Control;
ToolStripItem item = sender as ToolStripItem;
Point pt = new Point(this.ClientRectangle.Width, this.ClientRectangle.Height);
bool isShow;
FloatLayerBase p = CreateLayer(type, out isShow);
if (isShow)
{
if (c != null) { p.Show(c, pt); }
else { p.Show(item, pt); }
}
else
{
var result = c != null ? p.ShowDialog(c, pt) : p.ShowDialog(item, pt);
//txbResult.AppendText(result + "\r\n");
}
}
private void button1_Click(object sender, EventArgs e)
{
PopupLayer(typeof(UserControl1), sender);
}
