C# 可以向表单标题添加工具提示

在窗体上，窗体的标题是在设计器文件中设置的文本。我遇到的问题是，当标题国际化时，标题会被缩短并添加省略号。是否可以添加一个工具提示，当我们将鼠标悬停在标题上时将显示该提示？因此，如果我将鼠标悬停在“Form1”上，就会显示一个工具提示，上面写着“Form1”

表格是用C写的。由于标题不是表单中的控件，因此无法设置工具提示

有什么想法吗

---

一种方法是：

using System.Drawing;
using System.Threading.Tasks;

public Form1()
{
    InitializeComponent();
    ImplementToolBarToolTip();
}
private readonly ToolTip _toolTip1 = new ToolTip();
private async void ImplementToolBarToolTip()
{
    while (!IsDisposed)
    {
        await Task.Delay(200);
        var right = Left + Width;
        var bottom = Top + 39;
        var x = Cursor.Position.X;
        var y = Cursor.Position.Y;
        if (IsDisposed) return;
        if (x > Left && x < right && y > Top && y < bottom)
        {
            _toolTip1.Show(Text, this, PointToClient(new Point(x, y)));
        }
        else _toolTip1.Hide(this);
    }
}

---

另外，有关处理MDI子窗体相关问题的更复杂方法，请参阅Reza Aghaei的帖子，他现在也用重构实现回答了这个问题。

我已经在中分享了一个示例，演示了如何为窗体的非客户端区域引发悬停事件，包括标题栏并显示标题栏的工具提示

在本文中，我将通过添加对以下事件和属性的支持来重构和扩展另一个答案：

• 当鼠标悬停在非客户端区域上时，NonClientMouseHover将引发
• NonClientMouseLeave：当鼠标离开非客户端区域时引发
• 标题栏的矩形，不包括系统菜单

然后，通过使用这些事件和属性，我将显示标题栏的工具提示：

通过在从

BaseForm

类驱动的表单上使用工具提示组件，并处理

nonclientmousehave

和

nonclientmousehave

，可以轻松实现：

public partial class SampleForm : BaseForm
{
    public SampleForm()
    {
        InitializeComponent();
    }

    private void SampleForm_NonClientMouseHover(object sender, EventArgs e)
    {
        if (TitleRectangle.Contains(Cursor.Position))
            toolTip1.Show(Text, this, TitleRectangle.Left - this.Left + 1,
                TitleRectangle.Top - this.Top - 2, 5000);
    }

    private void SampleForm_NonClientMouseLeave(object sender, EventArgs e)
    {
        if (!TitleRectangle.Contains(Cursor.Position))
            toolTip1.Hide(this);
    }
}

下面是本机方法和基类

本机方法

这些是基类中用于处理非客户端区域消息的本机方法：

using System;
using System.Drawing;
using System.Runtime.InteropServices;
public static class NativeMethods
{
    public const int WM_NCMOUSEMOVE = 0xA0;
    public const int WM_NCMOUSEHOVER = 0x2A0;
    public const int WM_NCMOUSELEAVE = 0x2A2;
    public const int TME_HOVER = 0x1;
    public const int TME_LEAVE = 0x2;
    public const int TME_NONCLIENT = 0x10;

    [DllImport("user32.dll")]
    public static extern int TrackMouseEvent(ref TRACK_MOUSE_EVENT lpEventTrack);

    [DllImport("user32.dll")]
    public static extern bool GetTitleBarInfo(IntPtr hwnd, ref TITLEBARINFO pti);
    public static Rectangle GetTitleBarRectangle(IntPtr hwnd)
    {
        var info = new TITLEBARINFO() 
        { cbSize = (uint)Marshal.SizeOf(typeof(TITLEBARINFO)) };
        GetTitleBarInfo(hwnd, ref info);
        return info.rcTitleBar.ToRectangle();
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct TRACK_MOUSE_EVENT
    {
        public uint cbSize;
        public uint dwFlags;
        public IntPtr hwndTrack;
        public uint dwHoverTime;
        public static readonly TRACK_MOUSE_EVENT Empty;
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct TITLEBARINFO
    {
        public const int CCHILDREN_TITLEBAR = 5;
        public uint cbSize;
        public RECT rcTitleBar;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = CCHILDREN_TITLEBAR + 1)]
        public uint[] rgstate;
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct RECT
    {
        public int Left, Top, Right, Bottom;
        public Rectangle ToRectangle() => Rectangle.FromLTRB(Left, Top, Right, Bottom);
    }
}

基本形式

这是一个引发非客户端区域事件的基本

表单
类：

using System;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using static NativeMethods;
public class BaseForm : Form
{
    public event EventHandler NonClientMouseHover;
    public event EventHandler NonClientMouseLeave;
    public event EventHandler NonClientMouseMove;
    private TRACK_MOUSE_EVENT track = TRACK_MOUSE_EVENT.Empty;
    public Rectangle TitleRectangle => GetTitleBarRectangle(Handle);
    protected override void WndProc(ref Message m)
    {
        base.WndProc(ref m);
        if (m.Msg == WM_NCMOUSEMOVE)
        {
            track.hwndTrack = this.Handle;
            track.cbSize = (uint)Marshal.SizeOf(track);
            track.dwFlags = TME_HOVER | TME_LEAVE | TME_NONCLIENT;
            track.dwHoverTime = 500;
            TrackMouseEvent(ref track);
            NonClientMouseMove?.Invoke(this, EventArgs.Empty);
        }
        else if (m.Msg == WM_NCMOUSEHOVER)
        {
            NonClientMouseHover?.Invoke(this, EventArgs.Empty);
        }
        else if (m.Msg == WM_NCMOUSELEAVE)
        {
            NonClientMouseLeave?.Invoke(this, EventArgs.Empty);
        }
    }
}

这篇文章回答了你的问题吗？你可能想学习如何投票和接受答案。
using System;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using static NativeMethods;
public class BaseForm : Form
{
    public event EventHandler NonClientMouseHover;
    public event EventHandler NonClientMouseLeave;
    public event EventHandler NonClientMouseMove;
    private TRACK_MOUSE_EVENT track = TRACK_MOUSE_EVENT.Empty;
    public Rectangle TitleRectangle => GetTitleBarRectangle(Handle);
    protected override void WndProc(ref Message m)
    {
        base.WndProc(ref m);
        if (m.Msg == WM_NCMOUSEMOVE)
        {
            track.hwndTrack = this.Handle;
            track.cbSize = (uint)Marshal.SizeOf(track);
            track.dwFlags = TME_HOVER | TME_LEAVE | TME_NONCLIENT;
            track.dwHoverTime = 500;
            TrackMouseEvent(ref track);
            NonClientMouseMove?.Invoke(this, EventArgs.Empty);
        }
        else if (m.Msg == WM_NCMOUSEHOVER)
        {
            NonClientMouseHover?.Invoke(this, EventArgs.Empty);
        }
        else if (m.Msg == WM_NCMOUSELEAVE)
        {
            NonClientMouseLeave?.Invoke(this, EventArgs.Empty);
        }
    }
}