expo: Implement a box
It is useful to be able to draw a box around elements in the menu. Add support for an unfilled box with a selectable thickness. Note that there is no support for selecting the colour for any expo objects yet. Signed-off-by: Simon Glass <sjg@chromium.org>
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@@ -65,6 +65,8 @@ item is highlighted.
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A `textline object` contains a label and an editable string.
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A `box object` is a rectangle with a given line width. It is not filled.
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All components have a name. This is mostly for debugging, so it is easy to see
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what object is referred to, although the name is also used for saving values.
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Of course the ID numbers can help as well, but they are less easy to
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