NLA SoC: Transform tools for NLA

This commit restores transform support for NLA. Grab, scale, 'extend', and tweak (i.e. grab by just click+dragging) are implemented. 

Notes:
- As soon as one end of a strip touches another adjacent strip (within the same track), that end stops moving. This has been done to avoid the situation where overlapping strips within the same track (which is not allowed) might be caused by transforms.
- Made some changes to the RNA setters for the strip extents so that the validation above could take place (and other necessary changes on a per-strip basis could also occur).

TODO's ?
- Strips cannot be transferred from track to track using transforms. I've yet to decide whether this needs to be done, or whether a separate operator will suffice.
- What happens to the range of Actions used when the strips change sizes unexpectedly (i.e. the no-overlap condition above)? Currently range stays the same, but this doesn't always seem desirable?

1 files changed, 7 insertions, 0 deletions

diff --git a/source/blender/editors/transform/transform.h b/source/blender/editors/transform/transform.h
index ee767fada58..c0a57a85033 100644
--- a/source/blender/editors/transform/transform.h
+++ b/source/blender/editors/transform/transform.h
@@ -161,6 +161,13 @@ typedef struct TransDataSeq {
 	
 } TransDataSeq;
 
+/* for NLA transform (stored in td->extra pointer) */
+typedef struct TransDataNla {
+	struct NlaStrip *strip;		/* NLA-strip that handle belongs to */
+	float val;					/* value for the handle that the transform tools write to */
+	int handle;					/* handle-index, 0 for start, 1 for end */
+} TransDataNla;
+
 typedef struct TransData {
 	float  dist;         /* Distance needed to affect element (for Proportionnal Editing)                  */
 	float  rdist;        /* Distance to the nearest element (for Proportionnal Editing)                    */