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167 | class MaxPlaceholderScriptPlugin(MaxPlaceholderPlugin):
"""Execute a script at the given `order` during workfile build.
This is a very low-level placeholder to run Python scripts at a given
point in time during the workfile template build.
It can create a container as placeholder node.
"""
identifier = "max.runscript"
label = "Run Python Script"
use_selection_as_parent = False
def get_placeholder_options(self, options=None):
options = options or {}
return [
NumberDef(
"order",
label="Order",
default=options.get("order") or 0,
decimals=0,
minimum=0,
maximum=999,
tooltip=(
"Order"
"\nOrder defines asset loading priority (0 to 999)"
"\nPriority rule is : \"lowest is first to load\"."
)
),
TextDef(
"prepare_script",
label="Run at\nprepare",
tooltip="Run before populate at prepare order",
multiline=True,
default=options.get("prepare_script", "")
),
TextDef(
"populate_script",
label="Run at\npopulate",
tooltip="Run script at populate node order<br>"
"This is the <b>default</b> behavior",
multiline=True,
default=options.get("populate_script", EXAMPLE_SCRIPT)
),
TextDef(
"depth_processed_script",
label="Run after\ndepth\niteration",
tooltip="Run script after every build depth iteration",
multiline=True,
default=options.get("depth_processed_script", "")
),
TextDef(
"finished_script",
label="Run after\nbuild",
tooltip=(
"Run script at build finished.<br>"
"<b>Note</b>: this even runs if other placeholders had "
"errors during the build"
),
multiline=True,
default=options.get("finished_script", "")
),
]
def prepare_placeholders(self, placeholders):
super(MaxPlaceholderScriptPlugin, self).prepare_placeholders(
placeholders
)
for placeholder in placeholders:
prepare_script = placeholder.data.get("prepare_script")
if not prepare_script:
continue
self.run_script(placeholder, prepare_script)
def populate_placeholder(self, placeholder):
populate_script = placeholder.data.get("populate_script")
depth_script = placeholder.data.get("depth_processed_script")
finished_script = placeholder.data.get("finished_script")
# Run now
if populate_script:
self.run_script(placeholder, populate_script)
if not any([depth_script, finished_script]):
# No callback scripts to run
if not placeholder.data.get("keep_placeholder", True):
self.delete_placeholder(placeholder)
return
# Run at each depth processed
if depth_script:
callback = weakref_partial(
self.run_script, placeholder, depth_script)
self.builder.add_on_depth_processed_callback(
callback, order=placeholder.order)
# Run at build finish
if finished_script:
callback = weakref_partial(
self.run_script, placeholder, finished_script)
self.builder.add_on_finished_callback(
callback, order=placeholder.order)
# If placeholder should be deleted, delete it after finish so
# the scripts have access to it up to the last run
if not placeholder.data.get("keep_placeholder", True):
delete_callback = weakref_partial(
self.delete_placeholder, placeholder)
self.builder.add_on_finished_callback(
delete_callback, order=placeholder.order + 1)
def run_script(self, placeholder, script, event=None):
"""Run script
Even though `placeholder` is an unused arguments by exposing it as
an input argument it means it makes it available through
globals()/locals() in the `exec` call, giving the script access
to the placeholder.
For example:
>>> node = placeholder.scene_identifier
In the case the script is running at a callback level (not during
populate) then it has access to the `event` as well, otherwise the
value is None if it runs during `populate_placeholder` directly.
For example adding this as the callback script:
>>> if event is not None:
>>> if event.topic == "on_depth_processed":
>>> print(f"Processed depth: {event.get('depth')}")
>>> elif event.topic == "on_finished":
>>> print("Build finished.")
"""
self.log.debug(f"Running script at event: {event}")
exec(script, locals())
|