Causes the given @text to appear superimposed on the progress bar.
If @text is %NULL and #GtkProgressBar:show-text is %TRUE, the current
value of #GtkProgressBar:fraction will be displayed as a percentage.
If @text is non-%NULL and #GtkProgressBar:show-text is %TRUE, the text will
be displayed. In this case, it will not display the progress percentage.
If @text is the empty string, the progress bar will still be styled and sized
suitably for containing text, as long as #GtkProgressBar:show-text is %TRUE.
Causes the given @text to appear superimposed on the progress bar.
If @text is %NULL and #GtkProgressBar:show-text is %TRUE, the current value of #GtkProgressBar:fraction will be displayed as a percentage.
If @text is non-%NULL and #GtkProgressBar:show-text is %TRUE, the text will be displayed. In this case, it will not display the progress percentage. If @text is the empty string, the progress bar will still be styled and sized suitably for containing text, as long as #GtkProgressBar:show-text is %TRUE.