Action Constraint: Add manual time factor input control

Adds an optional slider to the action constraint so that it can be
driven without a constraint target.

This is very helpful for more complex rigging and mechanical rigs, as it
means the action constraint can be controlled with a driver/custom
property directly, currently if we want to use a driver to control it we
must add a "dummy" bone/object inbetween to act as a control.

Reviewed By: Sebastian Parborg, Sybren A. Stüvel, Demeter Dzadik, Julian Eisel

Differential Revision: http://developer.blender.org/D8022

1 files changed, 19 insertions, 7 deletions

diff --git a/release/scripts/startup/bl_ui/properties_constraint.py b/release/scripts/startup/bl_ui/properties_constraint.py
index da35ea680b8..14619ef916d 100644
--- a/release/scripts/startup/bl_ui/properties_constraint.py
+++ b/release/scripts/startup/bl_ui/properties_constraint.py
@@ -508,7 +508,18 @@ class ConstraintButtonsPanel(Panel):
         layout.use_property_split = True
         layout.use_property_decorate = True
 
-        self.target_template(layout, con)
+        target_row = layout.row(align=True)
+        target_row.active = not con.use_eval_time
+        self.target_template(target_row, con)
+
+        row = layout.row(align=True, heading="Evaluation Time")
+        row.use_property_decorate = False
+        sub = row.row(align=True)
+        sub.prop(con, "use_eval_time", text="")
+        subsub = sub.row(align=True)
+        subsub.active = con.use_eval_time
+        subsub.prop(con, "eval_time", text="")
+        row.prop_decorator(con, "eval_time")
 
         layout.prop(con, "mix_mode", text="Mix")
 
@@ -1105,13 +1116,14 @@ class ConstraintButtonsSubPanel(Panel):
         layout.use_property_split = True
         layout.use_property_decorate = True
 
-        layout.prop(con, "transform_channel", text="Channel")
-        layout.prop(con, "target_space")
-
-        col = layout.column(align=True)
-        col.prop(con, "min", text="Range Min")
-        col.prop(con, "max", text="Max")
+        col = layout.column()
+        col.active = not con.use_eval_time
+        col.prop(con, "transform_channel", text="Channel")
+        col.prop(con, "target_space")
 
+        sub = col.column(align=True)
+        sub.prop(con, "min", text="Range Min")
+        sub.prop(con, "max", text="Max")
 
     def draw_action_action(self, context):
         layout = self.layout