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const { calculateIndex } = Utils;
BlazeComponent.extendComponent({
// Proxy
openForm(options) {
this.childComponents('listBody')[0].openForm(options);
},
onCreated() {
this.newCardFormIsVisible = new ReactiveVar(true);
},
// The jquery UI sortable library is the best solution I've found so far. I
// tried sortable and dragula but they were not powerful enough four our use
// case. I also considered writing/forking a drag-and-drop + sortable library
// but it's probably too much work.
// By calling asking the sortable library to cancel its move on the `stop`
// callback, we basically solve all issues related to reactive updates. A
// comment below provides further details.
onRendered() {
const boardComponent = this.parentComponent();
const itemsSelector = '.js-minicard:not(.placeholder, .js-card-composer)';
const $cards = this.$('.js-minicards');
$cards.sortable({
connectWith: '.js-minicards',
tolerance: 'pointer',
appendTo: 'body',
helper(evt, item) {
const helper = item.clone();
if (MultiSelection.isActive()) {
const andNOthers = $cards.find('.js-minicard.is-checked').length - 1;
if (andNOthers > 0) {
helper.append($(Blaze.toHTML(HTML.DIV(
{ 'class': 'and-n-other' },
TAPi18n.__('and-n-other-card', { count: andNOthers })
))));
}
}
return helper;
},
distance: 7,
items: itemsSelector,
scroll: false,
placeholder: 'minicard-wrapper placeholder',
start(evt, ui) {
ui.placeholder.height(ui.helper.height());
EscapeActions.executeUpTo('popup');
boardComponent.setIsDragging(true);
},
stop(evt, ui) {
// To attribute the new index number, we need to get the DOM element
// of the previous and the following card -- if any.
const prevCardDom = ui.item.prev('.js-minicard').get(0);
const nextCardDom = ui.item.next('.js-minicard').get(0);
const nCards = MultiSelection.isActive() ? MultiSelection.count() : 1;
const sortIndex = calculateIndex(prevCardDom, nextCardDom, nCards);
const listId = Blaze.getData(ui.item.parents('.list').get(0))._id;
// Normally the jquery-ui sortable library moves the dragged DOM element
// to its new position, which disrupts Blaze reactive updates mechanism
// (especially when we move the last card of a list, or when multiple
// users move some cards at the same time). To prevent these UX glitches
// we ask sortable to gracefully cancel the move, and to put back the
// DOM in its initial state. The card move is then handled reactively by
// Blaze with the below query.
$cards.sortable('cancel');
if (MultiSelection.isActive()) {
Cards.find(MultiSelection.getMongoSelector()).forEach((card, i) => {
card.move(listId, sortIndex.base + i * sortIndex.increment);
});
} else {
const cardDomElement = ui.item.get(0);
const card = Blaze.getData(cardDomElement);
card.move(listId, sortIndex.base);
}
boardComponent.setIsDragging(false);
},
});
function userIsMember() {
return Meteor.user() && Meteor.user().isBoardMember();
}
// Disable drag-dropping if the current user is not a board member
this.autorun(() => {
$cards.sortable('option', 'disabled', !userIsMember());
});
// We want to re-run this function any time a card is added.
this.autorun(() => {
const currentBoardId = Tracker.nonreactive(() => {
return Session.get('currentBoard');
});
Cards.find({ boardId: currentBoardId }).fetch();
Tracker.afterFlush(() => {
$cards.find(itemsSelector).droppable({
hoverClass: 'draggable-hover-card',
accept: '.js-member,.js-label',
drop(event, ui) {
const cardId = Blaze.getData(this)._id;
const card = Cards.findOne(cardId);
if (ui.draggable.hasClass('js-member')) {
const memberId = Blaze.getData(ui.draggable.get(0)).userId;
card.assignMember(memberId);
} else {
const labelId = Blaze.getData(ui.draggable.get(0))._id;
card.addLabel(labelId);
}
},
});
});
});
},
}).register('list');
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