| Value | Meaning |
|---|---|
| NONE0 | No attribute, used for constant relations |
| LEFT1 | The left edge of a widget, regardless of text direction |
| RIGHT2 | The right edge of a widget, regardless of text direction |
| TOP3 | The top edge of a widget |
| BOTTOM4 | The bottom edge of a widget |
| START5 | The leading edge of a widget, depending on text direction; equivalent to %GTK_CONSTRAINT_ATTRIBUTE_LEFT for LTR languages, and %GTK_CONSTRAINT_ATTRIBUTE_RIGHT for RTL ones |
| END6 | The trailing edge of a widget, depending on text direction; equivalent to %GTK_CONSTRAINT_ATTRIBUTE_RIGHT for LTR languages, and %GTK_CONSTRAINT_ATTRIBUTE_LEFT for RTL ones |
| WIDTH7 | The width of a widget |
| HEIGHT8 | The height of a widget |
| CENTER_X9 | The center of a widget, on the horizontal axis |
| CENTER_Y10 | The center of a widget, on the vertical axis |
| BASELINE11 | The baseline of a widget |
The widget attributes that can be used when creating a GtkConstraint.