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"""
Modal Execution
+++++++++++++++
This operator defines a :class:`Operator.modal` function that will keep being
run to handle events until it returns ``{'FINISHED'}`` or ``{'CANCELLED'}``.
Modal operators run every time a new event is detected, such as a mouse click
or key press. Conversely, when no new events are detected, the modal operator
will not run. Modal operators are especially useful for interactive tools, an
operator can have its own state where keys toggle options as the operator runs.
Grab, Rotate, Scale, and Fly-Mode are examples of modal operators.
: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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