import bpy

def act_strip(context):
    try:
        return context.scene.sequence_editor.active_strip
    except AttributeError:
        return None

class StripSettings(bpy.types.PropertyGroup):
    bpy.types.ImageSequence.fakeinput1 = bpy.props.PointerProperty(name="Input 1", type=bpy.types.Sequences)

class LayoutDemoPanel( bpy.types.Panel):
    bl_label = "Offset"
    bl_options = {'DEFAULT_CLOSED'}
    bl_category = "Strip"
    bl_space_type = 'SEQUENCE_EDITOR'
    bl_region_type = 'UI'

    @staticmethod
    def has_sequencer(context):
        return (context.space_data.view_type in {'SEQUENCER', 'SEQUENCER_PREVIEW'})

    @classmethod
    def poll(cls, context):
        return cls.has_sequencer(context) and (act_strip(context) is not None)

    def draw_header(self, context):
        strip = act_strip(context)
        self.layout.prop(strip, "use_translation", text="")

    def draw(self, context):
        strip = act_strip(context)
        layout = self.layout
        layout.use_property_split = True

        layout.active = strip.use_translation and (not strip.mute)

        col = layout.column(align=True)
        col.prop(strip, "fakeinput1")




def register():

    bpy.utils.register_class(CrossfadeStripSettings)
    bpy.utils.register_class(LayoutDemoPanel)



def unregister():
    bpy.utils.unregister_class(LayoutDemoPanel)
    bpy.utils.unregister_class(StripSettings)

if __name__ == "__main__":
    register()