Animation: Select markers before/after current frame

Add operator to select markers left/right of the current frame
(including the current frame).

`bpy.ops.marker.select_leftright(mode='LEFT', extend=False)`

`mode` can be either 'LEFT' or 'RIGHT'.

The naming and defaults of the above variables match similar operators
(e.g., `bpy.ops.nla.select_leftright`)

This also adds a new sub-menu to the Marker menu found in animation
editors, exposing both the new `bpy.ops.marker.select_leftright`
operator as well as the `bpy.ops.marker.select_all` operator.

Despite the name "Before Current Frame" and "After Current Frame", it
also selects a marker that falls on the current from for both of the
modes. This is to match the behavior found in the `nla.select_leftright`
operator.

RCS: https://blender.community/c/rightclickselect/OgmG/

Reviewed by: sybren, looch

Differential Revision: https://developer.blender.org/D14176

2 files changed, 22 insertions, 0 deletions

diff --git a/release/scripts/startup/bl_ui/space_nla.py b/release/scripts/startup/bl_ui/space_nla.py
index 99324ac5d50..961d6525a69 100644
--- a/release/scripts/startup/bl_ui/space_nla.py
+++ b/release/scripts/startup/bl_ui/space_nla.py
@@ -150,6 +150,23 @@ class NLA_MT_marker(Menu):
         marker_menu_generic(layout, context)
 
 
+class NLA_MT_marker_select(Menu):
+    bl_label = 'Select'
+
+    def draw(self, context):
+        layout = self.layout
+
+        layout.operator("marker.select_all", text="All").action = 'SELECT'
+        layout.operator("marker.select_all", text="None").action = 'DESELECT'
+        layout.operator("marker.select_all", text="Invert").action = 'INVERT'
+
+        layout.separator()
+
+        layout.operator("marker.select_leftright", text="Before Current Frame").mode = 'LEFT'
+        layout.operator("marker.select_leftright", text="After Current Frame").mode = 'RIGHT'
+
+
+
 class NLA_MT_edit(Menu):
     bl_label = "Edit"
 
@@ -312,6 +329,7 @@ classes = (
     NLA_MT_view,
     NLA_MT_select,
     NLA_MT_marker,
+    NLA_MT_marker_select,
     NLA_MT_add,
     NLA_MT_edit_transform,
     NLA_MT_snap_pie,
diff --git a/release/scripts/startup/bl_ui/space_time.py b/release/scripts/startup/bl_ui/space_time.py
index b5b124253f3..13ab6e67b00 100644
--- a/release/scripts/startup/bl_ui/space_time.py
+++ b/release/scripts/startup/bl_ui/space_time.py
@@ -194,6 +194,10 @@ def marker_menu_generic(layout, context):
 
     layout.separator()
 
+    layout.menu('NLA_MT_marker_select')
+
+    layout.separator()
+
     layout.operator("marker.camera_bind")
 
     layout.separator()