playback.js

import {
    PLAY,
    PAUSE,
    STOP,
    STATUS,
    SET_FRAMES,
    APPEND_FRAMES,
    FRAMES_LOADING,
    SET_CURRENT_FRAME,
    SELECT_PLAYBACK_RANGE,
    CHANGE_SETTING,
    UPDATE_METADATA
} from '../actions/playback';

import { RESET_CONTROLS } from '../actions/controls';
import { set } from '../utils/ImmutableUtils';

const DEFAULT_SETTINGS = {
    timeStep: 1,
    stepUnit: "days",
    frameDuration: 2,
    following: true
};

export default (state = { status: STATUS.STOP, currentFrame: -1, settings: DEFAULT_SETTINGS}, action) => {
    switch (action.type) {
    case PLAY: {
        return set(`status`, STATUS.PLAY, state);
    }
    case PAUSE: {
        return set(`status`, STATUS.PAUSE, state);
    }
    case STOP: {
        return set(`status`, STATUS.STOP,
            set('currentFrame', -1, state)
        );
    }
    case SET_FRAMES: {
        return set('frames', action.frames,
            set('currentFrame', -1, state)
        );
    }
    case FRAMES_LOADING: {
        return set('framesLoading', action.loading, state);
    }
    case APPEND_FRAMES: {
        return set('frames', [
            ...(state.frames || []),
            ...action.frames
        ], state);
    }
    case SET_CURRENT_FRAME: {
        return set('currentFrame', action.frame, state);
    }
    case SELECT_PLAYBACK_RANGE: {
        return set('playbackRange', action.range, state);
    }
    case CHANGE_SETTING: {
        return set(`settings[${action.name}]`, action.value, state);
    }
    case UPDATE_METADATA: {
        return set('metadata', { next: action.next, previous: action.previous, forTime: action.forTime}, state);
    }
    case RESET_CONTROLS: {
        return set('metadata', undefined, set('framesLoading', undefined, set('playbackRange', undefined, set('frames', undefined,
            set('currentFrame', -1, set('status', "STOP", set('settings', DEFAULT_SETTINGS, state)
            ))))));
    }
    default:
        return state;
    }
};