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mastodon/app/assets/javascripts/components/reducers/modal.jsx

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import {
MEDIA_OPEN,
MODAL_CLOSE,
MODAL_INDEX_DECREASE,
MODAL_INDEX_INCREASE
} from '../actions/modal';
import Immutable from 'immutable';
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const initialState = Immutable.Map({
media: null,
index: 0,
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open: false
});
export default function modal(state = initialState, action) {
switch(action.type) {
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case MEDIA_OPEN:
return state.withMutations(map => {
map.set('media', action.media);
map.set('index', action.index);
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map.set('open', true);
});
case MODAL_CLOSE:
return state.set('open', false);
case MODAL_INDEX_DECREASE:
return state.update('index', index => Math.max(index - 1, 0));
case MODAL_INDEX_INCREASE:
return state.update('index', index => Math.min(index + 1, state.get('media').size - 1));
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default:
return state;
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}
};