Pie menus: Confirm threshold

This commit adds a confirm threshold property to pie menus.

Basically, this will confirm the pie menu automatically when
the distance from the center of the pie exceeds that threshold without
a need to release the pie button.

The confirm threshold will only work if it is larger than the pie
threshold.

The confirmation actually occur when the mouse stops moving, to
allow multiple pie menus to be better linked together, (see below)

This functionality also facilitates the ability for chained pie menus by
dragging. Basically, a pie menu item can be a call_menu_pie operator and
the new pie menu will still use the original pie menu release event for
confirmation. This should allow for quick, gesture based navigation in
pie menu hierarchies (going back in the hierarchy is still not supported
though)

There will be a demonstration pie in the official add-on soon

1 files changed, 2 insertions, 1 deletions

diff --git a/source/blender/makesdna/DNA_userdef_types.h b/source/blender/makesdna/DNA_userdef_types.h
index 382fd8c1dbd..769e2573aa4 100644
--- a/source/blender/makesdna/DNA_userdef_types.h
+++ b/source/blender/makesdna/DNA_userdef_types.h
@@ -540,7 +540,8 @@ typedef struct UserDef {
 	                             * a drag/release pie menu */
 	short pie_initial_timeout;  /* direction in the pie menu will always be calculated from the initial position
 	                             * within this time limit */
-	int pie_animation_timeout;
+	short pie_animation_timeout;
+	short pie_menu_confirm;
 	short pie_menu_radius;        /* pie menu radius */
 	short pie_menu_threshold;     /* pie menu distance from center before a direction is set */