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BlazeComponent.extendComponent({
template: function() {
return 'list';
},
// Proxies
openForm: function(options) {
this.componentChildren('listBody')[0].openForm(options);
},
onCreated: function() {
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: function() {
var self = this;
if (! Meteor.userId() || ! Meteor.user().isBoardMember())
return;
var boardComponent = self.componentParent();
var itemsSelector = '.js-minicard:not(.placeholder, .js-card-composer)';
var $cards = self.$('.js-minicards');
$cards.sortable({
connectWith: '.js-minicards',
tolerance: 'pointer',
appendTo: '#surface',
helper: function(evt, item) {
var helper = item.clone();
if (MultiSelection.isActive()) {
var andNOthers = $cards.find('.js-minicard.is-checked').length - 1;
if (andNOthers > 0) {
helper.append($(Blaze.toHTML(HTML.DIV(
// XXX Super bad class name
{'class': 'and-n-other'},
// XXX Need to translate
'and ' + andNOthers + ' other cards.'
))));
}
}
return helper;
},
distance: 7,
items: itemsSelector,
scroll: false,
placeholder: 'minicard-wrapper placeholder',
start: function(evt, ui) {
ui.placeholder.height(ui.helper.height());
EscapeActions.executeUpTo('popup');
boardComponent.setIsDragging(true);
},
stop: function(evt, ui) {
// To attribute the new index number, we need to get the DOM element
// of the previous and the following card -- if any.
var prevCardDom = ui.item.prev('.js-minicard').get(0);
var nextCardDom = ui.item.next('.js-minicard').get(0);
var nCards = MultiSelection.isActive() ? MultiSelection.count() : 1;
var sortIndex = Utils.calculateIndex(prevCardDom, nextCardDom, nCards);
var 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(function(c, i) {
Cards.update(c._id, {
$set: {
listId: listId,
sort: sortIndex.base + i * sortIndex.increment
}
});
});
} else {
var cardDomElement = ui.item.get(0);
var cardId = Blaze.getData(cardDomElement)._id;
Cards.update(cardId, {
$set: {
listId: listId,
sort: sortIndex.base
}
});
}
boardComponent.setIsDragging(false);
}
});
// We want to re-run this function any time a card is added.
self.autorun(function() {
var currentBoardId = Tracker.nonreactive(function() {
return Session.get('currentBoard');
});
Cards.find({ boardId: currentBoardId }).fetch();
Tracker.afterFlush(function() {
$cards.find(itemsSelector).droppable({
hoverClass: 'draggable-hover-card',
accept: '.js-member,.js-label',
drop: function(event, ui) {
var cardId = Blaze.getData(this)._id;
var addToSet;
if (ui.draggable.hasClass('js-member')) {
var memberId = Blaze.getData(ui.draggable.get(0)).userId;
addToSet = { members: memberId };
} else {
var labelId = Blaze.getData(ui.draggable.get(0))._id;
addToSet = { labelIds: labelId };
}
Cards.update(cardId, { $addToSet: addToSet });
}
});
});
});
}
}).register('list');
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