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# SPDX-License-Identifier: GPL-3.0-or-later
# Copyright (C) 2016-2020 by Nathan Lovato, Daniel Oakey, Razvan Radulescu, and contributors
import bpy
from .utils.global_settings import SequenceTypes
from .utils.doc import doc_name, doc_idname, doc_brief, doc_description
class POWER_SEQUENCER_OT_crossfade_edit(bpy.types.Operator):
"""
*brief* Adjust the location of the crossfade between 2 strips
Selects the handles of both inputs of a crossfade strip's input and
calls the grab operator. Allows you to quickly change the location
of a fade transition between two strips.
"""
doc = {
"name": doc_name(__qualname__),
"demo": "https://i.imgur.com/rCmLhg6.gif",
"description": doc_description(__doc__),
"shortcuts": [],
"keymap": "Sequencer",
}
bl_idname = doc_idname(__qualname__)
bl_label = doc["name"]
bl_description = doc_brief(doc["description"])
bl_options = {"REGISTER", "UNDO"}
crossfade_types = ["CROSS", "GAMMA_CROSS"]
@classmethod
def poll(cls, context):
return context.scene.sequence_editor.active_strip and context.selected_sequences
def execute(self, context):
active = context.scene.sequence_editor.active_strip
if active.type not in self.crossfade_types:
effect = self.find_cross_effect(context, active)
if not effect:
return {"CANCELLED"}
active = context.scene.sequence_editor.active_strip = effect
bpy.ops.sequencer.select_all(action="DESELECT")
active.select = True
active.input_1.select_right_handle = True
active.input_2.select_left_handle = True
active.input_1.select = True
active.input_2.select = True
bpy.ops.transform.seq_slide("INVOKE_DEFAULT")
return {"FINISHED"}
def find_cross_effect(self, sequence):
"""
Takes a single strip and finds effect strips that use it as input
Returns the effect strip(s) found as a list, ordered by starting frame
Returns None if no effect was found
"""
if sequence.type not in SequenceTypes.VIDEO + SequenceTypes.IMAGE:
return
effect_sequences = (s for s in context.sequences if s.type in SequenceTypes.EFFECT)
found_effect_strips = []
for s in effect_sequences:
if s.input_1.name == sequence.name:
found_effect_strips.append(s)
if s.input_count == 2:
if s.input_2.name == sequence.name:
found_effect_strips.append(s)
for e in found_effect_strips:
if e.type not in self.crossfade_types:
continue
return e
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