I answered my own question in the end but, in case anyone else has the same problem:
Gtk+ provides quite a lot of flexibility for custom theming engines to choose how they render widgets. Thus, if you don't explicitly specify which theming engine you want Gtk to use to draw your widget with (e.g. with the css "engine: none" tag to tell Gtk to use the inbuilt engine) then you can't guarantee that it will look a certain way.
This comes with the usual caveat that it's generally more important for an application to fit in with the rest of a desktop theme than for it to look exactly a certain way.
Tom
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Subject: gtk-list Digest, Vol 93, Issue 10
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Today's Topics:
1. gtk3 set titlebar color (john beritz)
2. Styling progress bars (Thomas Harty)
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Message: 1
Date: Sat, 7 Jan 2012 12:47:33 -0800
From: john beritz <jberitz@xxxxxxxxx>
To: gtk-list@xxxxxxxxx
Subject: gtk3 set titlebar color
Message-ID:
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How can I use gtk3 to override the window title bar background color? I
assume I need to use GtkStyleContext but I'm not sure how. Could someone
show me a minimal working example please.
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Message: 2
Date: Sat, 7 Jan 2012 21:17:22 +0000
From: Thomas Harty <t.harty1@xxxxxxxxxxxxxxxx>
To: "gtk-list@xxxxxxxxx" <gtk-list@xxxxxxxxx>
Subject: Styling progress bars
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Content-Type: text/plain; charset="iso-8859-1"
Dear all,
I'm trying to change the way my progress bars look using a css provider. I can change the way the slider (the active area in the progress bar's trough) looks by altering the ".progressbar" "background-image" property. However, even when I do this, there is a red border around the slider which I can't get rid of. I've tried changing the "border-width" property and every other property I could think of but I can't seem to get rid of it.
Does anyone know why it's there and how I alter it? I'm using Gtk-3 and Ubuntu,
Thanks,
Tom
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