Centre Align Multiline Label

[Jonathan3]

Hi,

We often have labels that contain newline characters and would like to be able to present these on screen centre aligned. There was an old discussion on this subject here:

Formatting Multiline Label

Hi Chad, I didn’t find any Api for the case in Map Suite 7.0, but I got a workaround by filling the space in the shorter line string at the header. Here is the codes:             TextStyle multiLineTextStyle = TextStyles.CreateSimpleTextStyle("[CNTRY_NAME]\n[POP_CNTRY]", “Arial”, 10, DrawingFontStyles.Bold, GeoColor.SimpleColors.Black);             multiLineTextStyle.Formatting += new System.EventHandler<FormattingPositionStyleEventArgs>(multiLineTextStyle_Formatting);             worldLa…

and the solution reads like it should be pretty much what we need, but unfortunately it appears that the text is being trimmed to remove leading whitespace after the reformatting, meaning any label where the first line needs padding is getting that padding removed somewhere else.

What would be the correct way of achieving the desired effect now? or is there a way to suppress removing leading whitespace?

Thanks,
Jonathan

[Ethan]

Hi Jonathan,

The best solution is override the FormatCore function of text style, in our default FormatCore it will trim the label, you can modify the logic by override it.

And if you want to implement that by event you can did it like this(I removed the center align logic here):

multiLineTextStyle.Formatted += MultiLineTextStyle_Formatted;

event:

        private void MultiLineTextStyle_Formatted(object sender, FormattedPositionStyleEventArgs e)
    {
        string tmpLabel = "  " + e.Text;


        string[] subTexts = tmpLabel.Split(new string[] { "\r\n", "\n" }, StringSplitOptions.None);
        int maxLength = subTexts[0].Length;
        foreach (var item in subTexts)
        {
            if (maxLength < item.Length)
                maxLength = item.Length;
        }

        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < subTexts.Length; i++)
        {
            sb.Append(subTexts[i]);
            if (i != (subTexts.Length - 1))
                sb.AppendLine();
        }
        e.Text = sb.ToString();
    }

Regards,

Ethan

[Jonathan3]

Ethan,

Thanks, I tried the Formatted event and it worked really well. I haven’t tried override FormatCore yet, are there any things done in the normal version that I would need to make sure I do in the replacement?

Regards,
Jonathan

[Ethan]

Hi Jonathan,

If Formatted works, you can just ignore override FormatCore.

In standard process it only handle the text to make it render better, I think you don’t need do other things now. Because you can do anything for the label format follow your requirement, so if you found the result is not you need please just override FormatCore to remove the standard process logic.

Regards,

Ethan

[Jonathan3]

Ethan,

Thanks. I tried out the FormatCore method as well and that also works nicely.

Regards,
Jonathan

[Ethan]

Hi Jonathan,

Thanks for your update.

Any question please let us know.

Regards,

Ethan