将鼠标光标位置更改为焦点控件

Question

I want Change mouse cursor position to focused control. I change focuses by keyboard(Enter key). How can I do this?

Answer 1

Here you go:

void goToActive()
{
    Control ctl = this.ActiveControl;
    this.Cursor = new Cursor(Cursor.Current.Handle);
    if (ctl != null) Cursor.Position = ctl.PointToScreen(new Point(3,3));
}

To catch your navigation key from everywhere override ProcessCmdKey as show here ..:

protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
    if (keyData == Keys.Enter) { goToActive(); return true;}
    return base.ProcessCmdKey(ref msg, keyData);
}

Update : If you'd rather not follow the Enter-Key but the Enter events of your controls, here is how to do that:

We register all controls in the Form.Shown event:

private void Form1_Shown(object sender, EventArgs e)
{
    registerAllControls(this);
}

This regisers all controls recursively. You may want to exlude some based on your needs, maybe checking the name, type or Tag ..:

void registerAllControls(Control ctl)
{
    ctl.Enter += ControlReceivedFocus;
    foreach (Control ct in ctl.Controls)
    {
        registerAllControls(ct);
    }
}

We call the modified goToActive function only when we are not here already..:

void ControlReceivedFocus(object sender, EventArgs e)
{
    if (!((sender as Control).ClientRectangle
        .Contains(PointToClient(MousePosition))))
    {
        goToActive(sender);
    }
}

I have modified the function to include the calling control, to make things a little easier..:

void goToActive(object sender)
{
    Control ctl = sender as Control;
    this.Cursor = new Cursor(Cursor.Current.Handle);
    Cursor.Position = ctl.PointToScreen(new Point(3, 3));
    if (sender is TextBox) Cursor = Cursors.IBeam; 
    else Cursor = Cursors.Default;
}

Note that the Cursor has a tendency to pick up wrong shapes; I set it to Default or, for TextBoxes to IBeam .

I have tested it, it works, but, as noted, I'd rather not have my cursor track my focus.. Make it an option, not a feature!