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window.Popup = new class {
constructor() {
// The template we use to render popups
this.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`.
this.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 [].
this._stack = [];
// We invalidate this internal dependency every time the top of the stack
// has changed and we want to re-render a popup with the new top-stack data.
this._dep = new Tracker.Dependency();
}
/// 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(name) {
const self = this;
const popupName = `${name}Popup`;
function clickFromPopup(evt) {
return $(evt.target).closest('.js-pop-over').length !== 0;
}
return function(evt) {
// If a popup is already opened, clicking again on the opener element
// should close it -- and interrupt the current `open` function.
if (self.isOpen()) {
const previousOpenerElement = self._getTopStack().openerElement;
if (previousOpenerElement === evt.currentTarget) {
self.close();
return;
} 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.
let openerElement;
if (clickFromPopup(evt)) {
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({
popupName,
openerElement,
hasPopupParent: clickFromPopup(evt),
title: self._getTitle(popupName),
depth: self._stack.length,
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 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, () => {
self._dep.depend();
return { ...self._getTopStack(), stack: self._stack };
}, 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(name, action) {
const self = this;
return function(evt, tpl) {
const context = this.currentData && this.currentData() || this;
context.__afterConfirmAction = action;
self.open(name).call(context, evt, tpl);
};
}
/// The public reactive state of the popup.
isOpen() {
this._dep.changed();
return Boolean(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(n = 1) {
if (this._stack.length > n) {
_.times(n, () => this._stack.pop());
this._dep.changed();
} else {
this.close();
}
}
/// Close the current opened popup.
close() {
if (this.isOpen()) {
Blaze.remove(this.current);
this.current = null;
const openerElement = this._getTopStack().openerElement;
$(openerElement).removeClass('is-active');
this._stack = [];
}
}
getOpenerComponent() {
const { openerElement } = Template.parentData(4);
return BlazeComponent.getComponentForElement(openerElement);
}
// An utility fonction that returns the top element of the internal stack
_getTopStack() {
return this._stack[this._stack.length - 1];
}
// 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(element) {
const $element = $(element);
return () => {
Utils.windowResizeDep.depend();
if(Utils.isMiniScreen()) return { left:0, top:0 };
const offset = $element.offset();
const popupWidth = 300 + 15;
return {
left: Math.min(offset.left, $(window).width() - popupWidth),
top: offset.top + $element.outerHeight(),
};
};
}
// We get the title from the translation files. Instead of returning the
// result, we return a function that compute the result and since `TAPi18n.__`
// is a reactive data source, the title will be changed reactively.
_getTitle(popupName) {
return () => {
const translationKey = `${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.
const title = TAPi18n.__(translationKey);
// when popup showed as full of small screen, we need a default header to clearly see [X] button
const defaultTitle = Utils.isMiniScreen() ? 'Wekan' : false;
return title !== translationKey ? title : defaultTitle;
};
}
}();
// We close a potential opened popup on any left click on the document, or go
// one step back by pressing escape.
const escapeActions = ['back', 'close'];
escapeActions.forEach((actionName) => {
EscapeActions.register(`popup-${actionName}`,
() => Popup[actionName](),
() => Popup.isOpen(),
{
noClickEscapeOn: '.js-pop-over,.js-open-card-title-popup',
enabledOnClick: actionName === 'close',
}
);
});
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