auto_rotate.py

import bpy

from mathutils import Euler

class TurntableOperator(bpy.types.Operator):
    bl_idname = "wm.turntable_operations"
    bl_label = "Turntable Operator"

    # command = bpy.props.StringProperty()

    def execute(self, context):
        wm = context.window_manager
        # currently only does stop
        context.scene.turntable_activation = False



class ModalViewRotationOperator(bpy.types.Operator):
    bl_idname = "wm.modal_turntable_operator"
    bl_label = "Modal Turntable Operator"

    _timer = None
    command = bpy.props.StringProperty()

    def modal(self, context, event):
        active = context.scene.turntable_activation
                
        if event.type in {'RIGHTMOUSE', 'ESC'} or active == False:
            context.scene.turntable_activation = False
            self.cancel(context)
            return {'CANCELLED'}

        if event.type == 'TIMER':
            v3d = context.space_data
            rv3d = v3d.region_3d
            # rv3d.view_location.x += 1.0
            # rv3d = bpy.context.screen.areas[2].spaces[0].region_3d
            rv3d.view_rotation.rotate(Euler((0, 0, 0.1)))
            # rv3d.view_location.x += 1.0
            # rv3d.view_distance -= 1.0
        return {'PASS_THROUGH'}

    def execute(self, context):
        context.scene.turntable_activation = True
        wm = context.window_manager
        self._timer = wm.event_timer_add(0.3, context.window)
        wm.modal_handler_add(self)
        return {'RUNNING_MODAL'}

    def cancel(self, context):
        context.scene.turntable_activation = False
        wm = context.window_manager
        wm.event_timer_remove(self._timer)



class ViewTurntablePanel(bpy.types.Panel):
    """Creates a Panel in the scene context of the properties editor"""
    bl_label = "Turntable Demo"
    bl_idname = "SCENE_PT_turntable"
    bl_space_type = 'VIEW_3D'
    bl_region_type = 'UI'
    bl_context = "scene"

    def draw(self, context):
        layout = self.layout
        scene = context.scene

        # Big render button
        row = layout.row()
        row.scale_y = 3.0
        row.operator("wm.modal_turntable_operator", text='start')

        # Big render button
        row = layout.row()
        row.scale_y = 3.0
        row.operator("wm.turntable_operations", text='stop')


def register():
    bpy.types.Scene.turntable_activation = bpy.props.BoolProperty(default=False)
    bpy.utils.register_class(ModalViewRotationOperator)
    bpy.utils.register_class(ViewTurntablePanel)
    bpy.utils.register_class(TurntableOperator)


def unregister():
    bpy.utils.unregister_class(TurntableOperator)
    bpy.utils.unregister_class(ViewTurntablePanel)
    bpy.utils.unregister_class(ModalViewRotationOperator)
    del bpy.types.Scene.turntable_activation


if __name__ == "__main__":
    register()