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alukos/pages.js

Created August 20, 2018 07:30
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  1. alukos created this gist Aug 20, 2018.
    32 changes: 32 additions & 0 deletions pages.js
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,32 @@
    movePage({ getters, commit }, { name, pageNum, direction }) {
    return new Promise(async (resolve, reject) => {
    try {
    if (pageNum == 1 && direction == 'left') {
    reject('Error cant move first page to the left');
    }
    const totalPages = getters.pageCount(name);
    if (pageNum >= totalPages && direction == 'right') {
    reject('Error cant move last page to the right');
    }
    const newPageNum = direction == 'left' ? pageNum - 1 : pageNum + 1;
    const db = fb.firestore();
    const pageUid = getters.pageItem(name, pageNum).uid;
    const newPageUid = getters.pageItem(name, newPageNum).uid;
    const pageRef = db.doc(`pages/${pageUid}`);
    const newPageRef = db.doc(`pages/${newPageUid}`);
    await db.runTransaction(async transaction => {
    const pageDoc = await transaction.get(pageRef);
    const newPageDoc = await transaction.get(newPageRef);
    const position = pageDoc.get('position');
    const newPosition = newPageDoc.get('position');
    await transaction.update(pageRef, { position: newPosition });
    await transaction.update(newPageRef, { position });
    });
    commit('exchangePosition', { name, pageNum, newPageNum });
    resolve(newPageNum);
    } catch (error) {
    console.error('Error move page: ', error);
    reject(error);
    }
    });
    },