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"""
Modal Execution
+++++++++++++++
This operator defines a :class:`Operator.modal` function which running,
handling events until it returns ``{'FINISHED'}`` or ``{'CANCELLED'}``.
Grab, Rotate, Scale and Fly-Mode are examples of modal operators.
They are especially useful for interactive tools,
your operator can have its own state where keys toggle options as the operator
runs.
:class:`Operator.invoke` is used to initialize the operator as being by
returning ``{'RUNNING_MODAL'}``, initializing the modal loop.
Notice ``__init__()`` and ``__del__()`` are declared.
For other operator types they are not useful but for modal operators they will
be called before the :class:`Operator.invoke` and after the operator finishes.
"""
import bpy
class ModalOperator(bpy.types.Operator):
bl_idname = "object.modal_operator"
bl_label = "Simple Modal Operator"
def __init__(self):
print("Start")
def __del__(self):
print("End")
def execute(self, context):
context.object.location.x = self.value / 100.0
return {'FINISHED'}
def modal(self, context, event):
if event.type == 'MOUSEMOVE': # Apply
self.value = event.mouse_x
self.execute(context)
elif event.type == 'LEFTMOUSE': # Confirm
return {'FINISHED'}
elif event.type in {'RIGHTMOUSE', 'ESC'}: # Cancel
context.object.location.x = self.init_loc_x
return {'CANCELLED'}
return {'RUNNING_MODAL'}
def invoke(self, context, event):
self.init_loc_x = context.object.location.x
self.value = event.mouse_x
self.execute(context)
context.window_manager.modal_handler_add(self)
return {'RUNNING_MODAL'}
bpy.utils.register_class(ModalOperator)
# test call
bpy.ops.object.modal_operator('INVOKE_DEFAULT')
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