align the widget according to the baseline.
stretch to fill all space, but align the baseline.
a different name for GTK_ALIGN_BASELINE.
center natural width of widget inside the allocation
snap to right or bottom side, leaving space on left or top
stretch to fill all space if possible, center if no meaningful way to stretch
snap to left or top side, leaving space on right or bottom
Controls how a widget deals with extra space in a single dimension.
Alignment only matters if the widget receives a “too large” allocation, for example if you packed the widget with the Gtk.Widget.hexpand property inside a Box, then the widget might get extra space. If you have for example a 16x16 icon inside a 32x32 space, the icon could be scaled and stretched, it could be centered, or it could be positioned to one side of the space.
Note that in horizontal context
GTK_ALIGN_STARTandGTK_ALIGN_ENDare interpreted relative to text direction.Baseline support is optional for containers and widgets, and is only available for vertical alignment.
GTK_ALIGN_BASELINE_CENTERandGTK_ALIGN_BASELINE_FILLare treated similar toGTK_ALIGN_CENTERandGTK_ALIGN_FILL, except that it positions the widget to line up the baselines, where that is supported.