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// A simple tracker dependency that we invalidate every time the window is
// resized. This is used to reactively re-calculate the popup position in case
// of a window resize.
var windowResizeDep = new Tracker.Dependency();
$(window).on('resize', function() { windowResizeDep.changed(); });
Popup = {
/// This function returns a callback that can be used in an event map:
///
/// Template.tplName.events({
/// 'click .elementClass': Popup.open("popupName")
/// });
///
/// The popup inherit the data context of its parent.
open: function(name) {
var self = this;
var popupName = name + 'Popup';
return function(evt) {
// If a popup is already openened, clicking again on the opener element
// should close it -- and interupt the current `open` function.
if (self.isOpen()) {
var previousOpenerElement = self._getTopStack().openerElement;
if (previousOpenerElement === evt.currentTarget) {
return self.close();
} else {
$(previousOpenerElement).removeClass('is-active');
}
}
// We determine the `openerElement` (the DOM element that is being clicked
// and the one we take in reference to position the popup) from the event
// if the popup has no parent, or from the parent `openerElement` if it
// has one. This allows us to position a sub-popup exactly at the same
// position than its parent.
var openerElement;
if (self._hasPopupParent()) {
openerElement = self._getTopStack().openerElement;
} else {
self._stack = [];
openerElement = evt.currentTarget;
}
$(openerElement).addClass('is-active');
evt.preventDefault();
// We push our popup data to the stack. The top of the stack is always
// used as the data source for our current popup.
self._stack.push({
__isPopup: true,
popupName: popupName,
hasPopupParent: self._hasPopupParent(),
title: self._getTitle(popupName),
openerElement: openerElement,
offset: self._getOffset(openerElement),
dataContext: this.currentData && this.currentData() || this
});
// If there are no popup currently opened we use the Blaze API to render
// one into the DOM. We use a reactive function as the data parameter that
// return the the complete along with its top element and depends on our
// internal dependency that is being invalidated every time the top
// element of the stack has changed and we want to update the popup.
//
// Otherwise if there is already a popup open we just need to invalidate
// our internal dependency, and since we just changed the top element of
// our internal stack, the popup will be updated with the new data.
if (! self.isOpen()) {
self.current = Blaze.renderWithData(self.template, function() {
self._dep.depend();
return _.extend(self._stack[self._stack.length - 1], {
stack: self._stack,
containerTranslation: (self._stack.length - 1) * -300
});
}, document.body);
} else {
self._dep.changed();
}
};
},
/// This function returns a callback that can be used in an event map:
///
/// Template.tplName.events({
/// 'click .elementClass': Popup.afterConfirm("popupName", function() {
/// // What to do after the user has confirmed the action
/// })
/// });
afterConfirm: function(name, action) {
var self = this;
return function(evt, tpl) {
var context = this.currentData && this.currentData() || this;
context.__afterConfirmAction = action;
self.open(name).call(context, evt, tpl);
};
},
/// The public reactive state of the popup.
isOpen: function() {
this._dep.changed();
return !! this.current;
},
/// In case the popup was opened from a parent popup we can get back to it
/// with this `Popup.back()` function. You can go back several steps at once
/// by providing a number to this function, e.g. `Popup.back(2)`. In this case
/// intermediate popup won't even be rendered on the DOM. If the number of
/// steps back is greater than the popup stack size, the popup will be closed.
back: function(n) {
n = n || 1;
var self = this;
if (self._stack.length > n) {
_.times(n, function() { self._stack.pop(); });
self._dep.changed();
} else {
self.close();
}
},
/// Close the current opened popup.
close: function() {
if (this.isOpen()) {
Blaze.remove(this.current);
this.current = null;
var openerElement = this._getTopStack().openerElement;
$(openerElement).removeClass('is-active');
this._stack = [];
}
},
// The template we use for every popup
template: Template.popup,
// We only want to display one popup at a time and we keep the view object in
// this `Popup._current` variable. If there is no popup currently opened the
// value is `null`.
_current: null,
// It's possible to open a sub-popup B from a popup A. In that case we keep
// the data of popup A so we can return back to it. Every time we open a new
// popup the stack grows, every time we go back the stack decrease, and if we
// close the popup the stack is reseted to the empty stack [].
_stack: [],
// We invalidate this internal dependency every time the top of the stack has
// changed and we want to render a popup with the new top-stack data.
_dep: new Tracker.Dependency(),
// An utility fonction that returns the top element of the internal stack
_getTopStack: function() {
return this._stack[this._stack.length - 1];
},
// We use the blaze API to determine if the current popup has been opened from
// a parent popup. The number we give to the `Template.parentData` has been
// determined experimentally and is susceptible to change if you modify the
// `Popup.template`
_hasPopupParent: function() {
var tryParentData = Template.parentData(3);
return !! (tryParentData && tryParentData.__isPopup);
},
// We automatically calculate the popup offset from the reference element
// position and dimensions. We also reactively use the window dimensions to
// ensure that the popup is always visible on the screen.
_getOffset: function(element) {
var $element = $(element);
return function() {
windowResizeDep.depend();
var offset = $element.offset();
var popupWidth = 300 + 15;
return {
left: Math.min(offset.left, $(window).width() - popupWidth),
top: offset.top + $element.outerHeight()
};
};
},
// We get the title from the translation files. Instead of returning the
// result, we return a function that compute the result and since `TAPi18n.__`
// is a reactive data source, the title will be changed reactively.
_getTitle: function(popupName) {
return function() {
var translationKey = popupName + '-title';
// XXX There is no public API to check if there is an available
// translation for a given key. So we try to translate the key and if the
// translation output equals the key input we deduce that no translation
// was available and returns `false`. There is a (small) risk a false
// positives.
var title = TAPi18n.__(translationKey);
return title !== translationKey ? title : false;
};
}
};
// We close a potential opened popup on any left click on the document, or go
// one step back by pressing escape.
EscapeActions.register('popup',
function(evt) { Popup[evt.type === 'click' ? 'close' : 'back'](); },
_.bind(Popup.isOpen, Popup), {
noClickEscapeOn: '.js-pop-over'
}
);
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