VSE: Implement the bounding box (xform) tool in the seq preview window

Make the "xform" tool/gizmo available for strip transformations in the
sequencer preview window.

Because of the amount of hacks needed to make the gizmo work nicely with
multiple strips at the same time, it was decided to only show the
translate gizmo when multiple strips are selected.

This is because the transforms with multiple strips would appear buggy
because of our lack of shearing support in the transform system.
There is also currently no way to properly sync the gizmo drawing with
the transform when using multiple strips.

Reviewed By: Richard Antalik, Campbell Barton

Differential Revision: http://developer.blender.org/D12729

1 files changed, 18 insertions, 1 deletions

diff --git a/release/scripts/startup/bl_ui/space_toolsystem_toolbar.py b/release/scripts/startup/bl_ui/space_toolsystem_toolbar.py
index 008129cd389..9b1b401bc5b 100644
--- a/release/scripts/startup/bl_ui/space_toolsystem_toolbar.py
+++ b/release/scripts/startup/bl_ui/space_toolsystem_toolbar.py
@@ -2515,6 +2515,18 @@ class _defs_sequencer_generic:
             keymap="Sequencer Tool: Scale",
         )
 
+    @ToolDef.from_fn
+    def transform():
+        return dict(
+            idname="builtin.transform",
+            label="Transform",
+            description=(
+                "Supports any combination of grab, rotate, and scale at once"
+            ),
+            icon="ops.transform.transform",
+            widget="SEQUENCER_GGT_gizmo2d",
+            # No keymap default action, only for gizmo!
+       )
 
 class _defs_sequencer_select:
     @ToolDef.from_fn
@@ -3112,6 +3124,8 @@ class SEQUENCER_PT_tools_active(ToolSelectPanelHelper, Panel):
             _defs_sequencer_generic.translate,
             _defs_sequencer_generic.rotate,
             _defs_sequencer_generic.scale,
+            _defs_sequencer_generic.transform,
+            None,
             _defs_sequencer_generic.sample,
             *_tools_annotate,
         ],
@@ -3126,9 +3140,12 @@ class SEQUENCER_PT_tools_active(ToolSelectPanelHelper, Panel):
             _defs_sequencer_generic.translate,
             _defs_sequencer_generic.rotate,
             _defs_sequencer_generic.scale,
-            _defs_sequencer_generic.blade,
+            _defs_sequencer_generic.transform,
+            None,
             _defs_sequencer_generic.sample,
             *_tools_annotate,
+            None,
+            _defs_sequencer_generic.blade,
         ],
     }