Text alignment with PangoTabArray

Platform
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1

Hi,
I want to display a simple text with an alignment, but cannot figure out how to use PangoTabArray.
Here is my sample code:

	char aaa[] =	"Just a value:\t 0,2588\n"
					"text:\t 11,98\n"
					"third line:\t 8744,599874";

	tab = pango_tab_array_new_with_positions (2, TRUE,
			PANGO_TAB_RIGHT, 200,
			PANGO_TAB_DECIMAL, 320);

	pango_layout_set_tabs (pangolay, tab);
	pango_layout_set_text (pangolay, aaa, -1);
	pango_cairo_show_layout (cr, pangolay);

and this is the output:
image
What I want is to align the text left from ‘:’ to the right (first tab) and the text after ‘:’ with a decimal alignment.
In my locale ‘,’ is the decimal separator.

2

You can see that your numbers are being right-aligned, so they’re using the first tab stop. It seems that you need to add a tab character at the start of each line so your layout will advance to the tab stop.

3

Hah! It works! Thank you! Alignment is perfect on both tab stops.

But could you maybe explain why it works like this? Is there some rule or a special way Pango is handling this? I could not find much in help.

4

It’s just like setting tab stops in a word processor, isn’t it? You have to tab to the stop.

It’s a little confusing that the Tabs demo in gtk4-demo has three tab stops with only two \ts per line, but it seems that the first stop is basically a no-op because it’s at position 0.

5

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