| Value | Meaning |
|---|---|
| NONE0 | No transition |
| CROSSFADE1 | A cross-fade |
| SLIDE_RIGHT2 | Slide from left to right |
| SLIDE_LEFT3 | Slide from right to left |
| SLIDE_UP4 | Slide from bottom up |
| SLIDE_DOWN5 | Slide from top down |
| SLIDE_LEFT_RIGHT6 | Slide from left or right according to the children order |
| SLIDE_UP_DOWN7 | Slide from top down or bottom up according to the order |
| OVER_UP8 | Cover the old page by sliding up. Since 3.12 |
| OVER_DOWN9 | Cover the old page by sliding down. Since: 3.12 |
| OVER_LEFT10 | Cover the old page by sliding to the left. Since: 3.12 |
| OVER_RIGHT11 | Cover the old page by sliding to the right. Since: 3.12 |
| UNDER_UP12 | Uncover the new page by sliding up. Since 3.12 |
| UNDER_DOWN13 | Uncover the new page by sliding down. Since: 3.12 |
| UNDER_LEFT14 | Uncover the new page by sliding to the left. Since: 3.12 |
| UNDER_RIGHT15 | Uncover the new page by sliding to the right. Since: 3.12 |
| OVER_UP_DOWN16 | Cover the old page sliding up or uncover the new page sliding down, according to order. Since: 3.12 |
| OVER_DOWN_UP17 | Cover the old page sliding down or uncover the new page sliding up, according to order. Since: 3.14 |
| OVER_LEFT_RIGHT18 | Cover the old page sliding left or uncover the new page sliding right, according to order. Since: 3.14 |
| OVER_RIGHT_LEFT19 | Cover the old page sliding right or uncover the new page sliding left, according to order. Since: 3.14 |
These enumeration values describe the possible transitions between pages in a #GtkStack widget.
New values may be added to this enumeration over time.