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# Authors: see git history
#
# Copyright (c) 2024 Authors
# Licensed under the GNU GPL version 3.0 or later. See the file LICENSE for details.
from threading import Event, Thread
import wx
from ...debug.debug import debug
from ...utils.threading import ExitThread
class PreviewRenderer(Thread):
"""Render stitch plan in a background thread."""
def __init__(self, render_stitch_plan_hook, rendering_completed_hook):
super(PreviewRenderer, self).__init__()
self.daemon = True
self.refresh_needed = Event()
self.render_stitch_plan_hook = render_stitch_plan_hook
self.rendering_completed_hook = rendering_completed_hook
# This is read by utils.threading.check_stop_flag() to abort stitch plan
# generation.
self.stop = Event()
def update(self):
"""Request to render a new stitch plan.
self.render_stitch_plan_hook() will be called in a background thread, and then
self.rendering_completed_hook() will be called with the resulting stitch plan.
"""
if not self.is_alive():
self.start()
self.stop.set()
self.refresh_needed.set()
def run(self):
while True:
self.refresh_needed.wait()
self.refresh_needed.clear()
self.stop.clear()
try:
debug.log("update_patches")
self.render_stitch_plan()
except ExitThread:
debug.log("ExitThread caught")
self.stop.clear()
def render_stitch_plan(self):
try:
stitch_plan = self.render_stitch_plan_hook()
if stitch_plan:
# rendering_completed() will be called in the main thread.
wx.CallAfter(self.rendering_completed_hook, stitch_plan)
except ExitThread:
raise
except: # noqa: E722
import traceback
debug.log("unhandled exception in PreviewRenderer.render_stitch_plan(): " + traceback.format_exc())
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