text: # ##### BEGIN GPL LICENSE BLOCK #####
  #
  #  This program is free software; you can redistribute it and/or
  #  modify it under the terms of the GNU General Public License
  #  as published by the Free Software Foundation; either version 2
  #  of the License, or (at your option) any later version.
  #
  #  This program is distributed in the hope that it will be useful,
  #  but WITHOUT ANY WARRANTY; without even the implied warranty of
  #  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  #  GNU General Public License for more details.
  #
  #  You should have received a copy of the GNU General Public License
  #  along with this program; if not, write to the Free Software Foundation,
  #  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  #
  # ##### END GPL LICENSE BLOCK #####
  
  # <pep8 compliant>
  import bpy
  from bpy.types import Header, Menu, Panel
  
  
  # Header buttons for timeline header (play, etc.)
  class TIME_HT_editor_buttons(Header):
      bl_idname = "TIME_HT_editor_buttons"
      bl_space_type = 'DOPESHEET_EDITOR'
      bl_label = ""
  
      def draw(self, context):
          pass
  
      @staticmethod
      def draw_header(context, layout):
          scene = context.scene
          tool_settings = context.tool_settings
          screen = context.screen
  
          layout.separator_spacer()
  
          layout.prop(tool_settings, "use_keyframe_insert_auto", text="", toggle=True)
  
          row = layout.row(align=True)
          row.operator("screen.frame_jump", text="", icon='REW').end = False
          row.operator("screen.keyframe_jump", text="", icon='PREV_KEYFRAME').next = False
          if not screen.is_animation_playing:
              # if using JACK and A/V sync:
              #   hide the play-reversed button
              #   since JACK transport doesn't support reversed playback
              if scene.sync_mode == 'AUDIO_SYNC' and context.preferences.system.audio_device == 'JACK':
                  sub = row.row(align=True)
                  sub.scale_x = 1.4
                  sub.operator("screen.animation_play", text="", icon='PLAY')
              else:
                  row.operator("screen.animation_play", text="", icon='PLAY_REVERSE').reverse = True
                  row.operator("screen.animation_play", text="", icon='PLAY')
          else:
              sub = row.row(align=True)
              sub.scale_x = 1.4
              sub.operator("screen.animation_play", text="", icon='PAUSE')
          row.operator("screen.keyframe_jump", text="", icon='NEXT_KEYFRAME').next = True
          row.operator("screen.frame_jump", text="", icon='FF').end = True
  
          layout.separator_spacer()
  
          row = layout.row()
          row.scale_x = 0.95
          if scene.show_subframe:
              row.prop(scene, "frame_float", text="")
          else:
              row.prop(scene, "frame_current", text="")
  
          row = layout.row(align=True)
          row.prop(scene, "use_preview_range", text="", toggle=True)
          sub = row.row(align=True)
          sub.scale_x = 0.8
          if not scene.use_preview_range:
              sub.prop(scene, "frame_start", text="Start")
              sub.prop(scene, "frame_end", text="End")
          else:
              sub.prop(scene, "frame_preview_start", text="Start")
              sub.prop(scene, "frame_preview_end", text="End")
  
  
  class TIME_MT_editor_menus(Menu):
      bl_idname = "TIME_MT_editor_menus"
      bl_label = ""
  
      def draw(self, _context):
          layout = self.layout
          horizontal = (layout.direction == 'VERTICAL')
          if horizontal:
              row = layout.row()
              sub = row.row(align=True)
          else:
              sub = layout
  
          sub.popover(
              panel="TIME_PT_playback",
              text="Playback",
          )
          sub.popover(
              panel="TIME_PT_keyframing_settings",
              text="Keying",
          )
  
          if horizontal:
              sub = row.row(align=True)
  
          sub.menu("TIME_MT_view")
          sub.menu("TIME_MT_marker")
  
  
  class TIME_MT_marker(Menu):
      bl_label = "Marker"
  
      def draw(self, context):
          layout = self.layout
  
          marker_menu_generic(layout, context)
  
  
  class TIME_MT_view(Menu):
      bl_label = "View"
  
      def draw(self, context):
          layout = self.layout
  
          scene = context.scene
          st = context.space_data
  
          layout.prop(st, "show_seconds")
          layout.prop(st, "show_locked_time")
  
          layout.separator()
  
          layout.prop(st, "show_marker_lines")
          layout.prop(st, "show_frame_indicator")
          layout.prop(scene, "show_keys_from_selected_only")
  
          layout.separator()
  
          layout.menu("TIME_MT_cache")
  
          layout.separator()
  
          # NOTE: "action" now, since timeline is in the dopesheet editor, instead of as own editor
          layout.operator("action.view_all")
          layout.operator("action.view_frame")
  
          layout.separator()
  
          layout.menu("INFO_MT_area")
  
  
  class TIME_MT_cache(Menu):
      bl_label = "Cache"
  
      def draw(self, context):
          layout = self.layout
  
          st = context.space_data
  
          layout.prop(st, "show_cache")
  
          layout.separator()
  
          col = layout.column()
          col.enabled = st.show_cache
          col.prop(st, "cache_softbody")
          col.prop(st, "cache_particles")
          col.prop(st, "cache_cloth")
          col.prop(st, "cache_smoke")
          col.prop(st, "cache_dynamicpaint")
          col.prop(st, "cache_rigidbody")
  
  
  def marker_menu_generic(layout, context):
  
      # layout.operator_context = 'EXEC_REGION_WIN'
  
      layout.column()
      layout.operator("marker.add", text="Add Marker")
      layout.operator("marker.duplicate", text="Duplicate Marker")
  
      if len(bpy.data.scenes) > 10:
          layout.operator_context = 'INVOKE_DEFAULT'
          layout.operator("marker.make_links_scene", text="Duplicate Marker to Scene...", icon='OUTLINER_OB_EMPTY')
      else:
          layout.operator_menu_enum("marker.make_links_scene", "scene", text="Duplicate Marker to Scene")
  
      layout.operator("marker.delete", text="Delete Marker")
  
      layout.separator()
  
      layout.operator("marker.rename", text="Rename Marker")
      layout.operator("marker.move", text="Move Marker")
  
      layout.separator()
  
      layout.operator("marker.camera_bind")
  
      layout.separator()
  
      layout.operator("screen.marker_jump", text="Jump to Next Marker").next = True
      layout.operator("screen.marker_jump", text="Jump to Previous Marker").next = False
  
      layout.separator()
      tool_settings = context.tool_settings
      layout.prop(tool_settings, "lock_markers")
  
  ###################################
  
  
  class TimelinePanelButtons:
      bl_space_type = 'DOPESHEET_EDITOR'
      bl_region_type = 'UI'
  
      @staticmethod
      def has_timeline(context):
          return context.space_data.mode == 'TIMELINE'
  
  
  class TIME_PT_playback(TimelinePanelButtons, Panel):
      bl_label = "Playback"
      bl_region_type = 'HEADER'
  
      def draw(self, context):
          layout = self.layout
  
          screen = context.screen
          scene = context.scene
  
          layout.prop(scene, "sync_mode", text="")
          layout.prop(scene, "use_audio_scrub")
          layout.prop(scene, "use_audio", text="Mute Audio")
  
          layout.prop(scene, "show_subframe", text="Subframes")
  
          layout.prop(scene, "lock_frame_selection_to_range", text="Limit Playhead to Frame Range")
          layout.prop(screen, "use_follow", text="Follow Playhead")
  
          layout.separator()
  
          col = layout.column()
          col.label(text="Play Animation In:")
          layout.prop(screen, "use_play_top_left_3d_editor", text="Active Editor Only")
          layout.prop(screen, "use_play_3d_editors")
          layout.prop(screen, "use_play_animation_editors")
          layout.prop(screen, "use_play_properties_editors")
          layout.prop(screen, "use_play_image_editors")
          layout.prop(screen, "use_play_sequence_editors")
          layout.prop(screen, "use_play_node_editors")
          layout.prop(screen, "use_play_clip_editors")
  
          layout.separator()
  
          row = layout.row(align=True)
          row.operator("anim.start_frame_set")
          row.operator("anim.end_frame_set")
  
  
  class TIME_PT_keyframing_settings(TimelinePanelButtons, Panel):
      bl_label = "Keyframing Settings"
      bl_options = {'HIDE_HEADER'}
      bl_region_type = 'HEADER'
  
      @classmethod
      def poll(cls, context):
          # only for timeline editor
          return cls.has_timeline(context)
  
      def draw(self, context):
          layout = self.layout
  
          scene = context.scene
          tool_settings = context.tool_settings
          prefs = context.preferences
  
          col = layout.column(align=True)
          col.label(text="Active Keying Set:")
          row = col.row(align=True)
          row.prop_search(scene.keying_sets_all, "active", scene, "keying_sets_all", text="")
          row.operator("anim.keyframe_insert", text="", icon='KEY_HLT')
          row.operator("anim.keyframe_delete", text="", icon='KEY_DEHLT')
  
          col = layout.column(align=True)
          col.label(text="New Keyframe Type:")
          col.prop(tool_settings, "keyframe_type", text="")
  
          col = layout.column(align=True)
          col.label(text="Auto Keyframing:")
          row = col.row()
          row.prop(tool_settings, "auto_keying_mode", text="")
          row.prop(tool_settings, "use_keyframe_insert_keyingset", text="")
          if not prefs.edit.use_keyframe_insert_available:
              col.prop(tool_settings, "use_record_with_nla", text="Layered Recording")
  
          layout.prop(tool_settings, "use_keyframe_cycle_aware")
  
  
  ###################################
  
  classes = (
      TIME_HT_editor_buttons,
      TIME_MT_editor_menus,
      TIME_MT_marker,
      TIME_MT_view,
      TIME_MT_cache,
      TIME_PT_playback,
      TIME_PT_keyframing_settings,
  )
  
  if __name__ == "__main__":  # only for live edit.
      from bpy.utils import register_class
      for cls in classes:
          register_class(cls)
  