修改或隐藏窗体的标题工具提示

这将使用手动工具提示和计时器在鼠标移动到标题栏上时显示/隐藏标题。

public partial class Form1 : Form
{
    private ToolTip toolTip = new ToolTip();
    private Timer toolTipTimer = new Timer();
    private bool canShowToolTip = true;

    protected override void WndProc(ref Message m)
    {
        switch (m.Msg)
        {
            case 0x2A0: // WM_NCMOUSEHOVER
                return;
            case (int)0x00A0: // WM_NCMOUSEMOVE
                if (m.WParam == new IntPtr(0x0002)) // HT_CAPTION
                {
                    if (canShowToolTip)
                    {
                        canShowToolTip = false;
                        toolTip.Show(this.Text, this, this.PointToClient(Cursor.Position), toolTip.AutoPopDelay);
                        toolTipTimer.Start();
                    }
                }
                return;
        }
        base.WndProc(ref m);
    }

    public Form1()
    {
        InitializeComponent();
        Form child = new Form();
        child.Text = "Program1 - Filename:[Really_long_filename_that_doesnt_fit.file] AAAAAAAAAAAAAAAAAAAA BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB";
        child.MdiParent = this;
        child.Show();
        toolTip.AutoPopDelay = 5000;
        toolTipTimer.Interval = toolTip.AutoPopDelay;
        toolTipTimer.Tick += delegate(object sender, EventArgs e)
        {
            canShowToolTip = true;
        };
    }
}