hello_world.py

# Copyright 2024 Allen Synthesis
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from time import sleep
from europi import oled, b1, din
from europi_script import EuroPiScript


class HelloWorld(EuroPiScript):
    def __init__(self):
        super().__init__()
        state = self.load_state_json()

        self.counter = state.get("counter", 0)
        self.enabled = state.get("enabled", True)

        din.handler(self.increment_counter)
        b1.handler(self.toggle_enablement)

    @classmethod
    def display_name(cls):
        return "Hello World"

    def increment_counter(self):
        if self.enabled:
            self.counter += 1
            self.save_state()

    def toggle_enablement(self):
            self.enabled = not self.enabled
            self.save_state()

    def save_state(self):
        """Save the current state variables as JSON."""
        # Don't save if it has been less than 5 seconds since last save.
        if self.last_saved() < 5000:
            return

        state = {
            "counter": self.counter,
            "enabled": self.enabled,
        }
        self.save_state_json(state)

    def main(self):
        while True:
            oled.centre_text(f"Hello world\n{self.counter}")
            sleep(1)

if __name__ == "__main__":
    HelloWorld().main()