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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 bpy.app.handlers import persistent
@persistent
def power_sequencer_playback_speed_post(scene):
"""
Handler function for faster playback
Skips keyframes after a frame change based on the playback_speed value
It steps over frame rather than increase the playback speed smoothly,
but it's still useful for faster editing
"""
# Calling this function triggers a callback to this function via the frame
# changed handler, causing a stack overflow. We use a property to prevent
# errors.
if bpy.context.screen and not bpy.context.screen.is_animation_playing:
return
playback_speed = scene.power_sequencer.playback_speed
target_frame = scene.frame_current
if playback_speed == "DOUBLE":
target_frame += 1
elif playback_speed == "TRIPLE":
target_frame += 2
if target_frame != scene.frame_current:
bpy.ops.screen.frame_offset(delta=target_frame - scene.frame_current)
def draw_playback_speed(self, context):
layout = self.layout
scene = context.scene
layout.prop(scene.power_sequencer, "playback_speed")
def draw_ui_menu(self, context):
layout = self.layout
layout.menu("POWER_SEQUENCER_MT_main")
def register_handlers():
# Menus
bpy.types.SEQUENCER_HT_header.append(draw_ui_menu)
bpy.types.SEQUENCER_HT_header.append(draw_playback_speed)
# Handlers
bpy.app.handlers.frame_change_post.append(power_sequencer_playback_speed_post)
def unregister_handlers():
# Menus
bpy.types.SEQUENCER_HT_header.remove(draw_ui_menu)
bpy.types.SEQUENCER_HT_header.remove(draw_playback_speed)
# Handlers
bpy.app.handlers.frame_change_post.remove(power_sequencer_playback_speed_post)
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