Request: Text color in progress bar

[luigifab]

What should be patched?

Perhaps for good reasons, GTK has moved the progress text outside the progress bar.
(the double text color still works with progress bars in treeviews)

I suggest to add something like: GTK_PROGRESS_TEXT_INSIDE=1.
When this environment variable exists:

• add the progress text inside the progress bar,
• add a new CSS class to the progress bar,
• and allow the text to get two colors.

How? I don't know, I found how to put the text inside the progress bar, and how to add a CSS class to the progress bar. But for the colors... Draft.

Screenshots

Ambiance theme with Ubuntu 11.10 - GTK 3.2:

Ambiance theme with Ubuntu 13.04 - GTK 3.6:

Ambiance theme with Ubuntu 13.10 - GTK 3.8:

My theme with GTK 3.24 (without any GTK changes):

Commits

The old method, GTK 3.6: gtk_progress_bar_paint_text
The new method (not sure), GTK 3.24: gtk_progress_bar_render_text

For progress bar in treeview, the method (not sure), GTK 3.24: gtk_cell_renderer_progress_render

[luigifab]

I tried some ideas (appearance__progress_text.patch).

I think the idea is simple:

• draw the text for "left part"
• draw the text for "right part"
• draw texts at the same position
• next, texts must be clipped (according the position of the progress bar)

For now, the patch doesn't calculate clip position/size correctly...

[lah7]

You may be interested in the code for this patch that was going to introduce this classic style of progress bar to the MATE shut down / log out dialog:

• Log Out / Shut Down dialogs: Restore classic GTK+ 2 appearance mate-desktop/mate-session-manager#261

[luigifab]

Yolo! done for gtk3! horizontal! vertical! ltr! rtl!

for gtk3: automatic width/height without min-width/height from css theme + position of the text, currently text node is added here: progressbar trough progress text, but text is displayed before the progress bar, not on it!

for gtk4: nothing works, the text is displayed under the progress bar, I tried to move it like with gtk3, but the text is not rendered any more...