Customized ToolTip Not Working Correctly

Question

In my Windows Form Application in C#, I have many TextBox controls, all of which have the same ToolTip control/message attached to them. Without any customization, the ToolTip was working perfectly.

Now, I added BackColor to the ToolTip balloons using the code snippet selected as the best answer in Change winform ToolTip backcolor. This does work great to add a BackColor to the ToolTip balloon, but it somehow removed all Environment.NewLine's in the string message. It seems to be showing the balloon of the same size, though.

Can someone tell me why this is happening, and how to fix this?

private ToolTip _tt = new ToolTip();
private string _ttipText;
private void ToolTipCustomization(){
    string nl = Environment.NewLine;
    /* This text is not shown properly when BackColor is added */
    _ttipText = "The value must be: " + nl +
                      "1, Numeric " + nl +
                      "2, Between 0 and 1000" + nl +
                      "3, A multiple of 10";
    _tt.OwnerDraw = true;
    _tt.BackColor = Color.LightBlue;
    _tt.Draw += new DrawToolTipEventHandler(TT_Draw);
}

private void TT_Draw(object sender, DrawToolTipEventArgs e){
    e.DrawBackground();
    e.DrawBorder();
    e.DrawText();
}

//Adding TextBox controls programmatically
private Textbox[] tbx = new TextBox[20];
private void CreateTextBox(){
    for(int i=0; i<20; i++){
        tbx[i] = new TextBox();
        /* More TextBox properties for design (Omit) */
        _tt.SetToolTip(tbx[i], _ttipText);  //Set ToolTip text to tbx here
        this.Controls.Add(tbx[i]);
    }
}

I tried subscribing PopupEventHandler in which I enlarged the balloon size but it did not solve my problem.

You just don't like the default e.DrawText() implementation. It uses TextFormatFlags.SingleLine. You'll have to write your own to make it look better. — Hans Passant
– Hans Passant, Commented Oct 24, 2017 at 14:35

J.Doe · Accepted Answer · 2017-10-24 15:19:50Z

1

Finally, I was able to find a solution to my own question thanks to the advice from Hans Passant.

It was as simple as adding a TextFormatFlags parameter to e.DrawText like the following:

private void TT_Draw(object sender, DrawToolTipEventArgs e){
    e.DrawBackground();
    e.DrawBorder();
    e.DrawText(TextFormatFlags.VerticalCenter); /* here */
}

Now It is showing the text properly. Thank you!

answered Oct 24, 2017 at 15:19

J.Doe

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