| Value | Meaning |
|---|---|
| FILL0 | stretch to fill all space if possible, center if no meaningful way to stretch |
| START1 | snap to left or top side, leaving space on right or bottom |
| END2 | snap to right or bottom side, leaving space on left or top |
| CENTER3 | center natural width of widget inside the allocation |
| BASELINE4 | align the widget according to the baseline. See #GtkWidget |
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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 [property@Gtk.Widget:hexpand] property inside a GtkBox, 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_START and %GTK_ALIGN_END are interpreted relative to text direction.
%GTK_ALIGN_BASELINE support is optional for containers and widgets, and it is only supported for vertical alignment. When it's not supported by a child or a container it is treated as %GTK_ALIGN_FILL.