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// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* A simple router for the message drawer that allows navigating between
* the "pages" in the drawer.
*
* This module will maintain a linear history of the unique pages access
* to allow navigating back.
*
* @module core_message/message_drawer_router
* @copyright 2018 Ryan Wyllie <ryan@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
define(
[
'jquery',
'core/pubsub',
'core/str',
'core_message/message_drawer_events'
],
function(
$,
PubSub,
Str,
MessageDrawerEvents
) {
/* @var {object} routes Message drawer route elements and callbacks. */
var routes = {};
/* @var {object} history Store for route objects history. */
var history = {};
var SELECTORS = {
CAN_RECEIVE_FOCUS: 'input:not([type="hidden"]), a[href], button, textarea, select, [tabindex]',
ROUTES_BACK: '[data-route-back]'
};
/**
* Add a route.
*
* @param {String} namespace Unique identifier for the Routes
* @param {string} route Route config name.
* @param {array} parameters Route parameters.
* @param {callback} onGo Route initialization function.
* @param {callback} getDescription Route initialization function.
*/
var add = function(namespace, route, parameters, onGo, getDescription) {
if (!routes[namespace]) {
routes[namespace] = [];
}
routes[namespace][route] =
{
parameters: parameters,
onGo: onGo,
getDescription: getDescription
};
};
/**
* Go to a defined route and run the route callbacks.
*
* @param {String} namespace Unique identifier for the Routes
* @param {string} newRoute Route config name.
* @return {object} record Current route record with route config name and parameters.
*/
var changeRoute = function(namespace, newRoute) {
var newConfig;
// Check if the Route change call is made from an element in the app panel.
var fromPanel = [].slice.call(arguments).some(function(arg) {
return arg == 'frompanel';
});
// Get the rest of the arguments, if any.
var args = [].slice.call(arguments, 2);
var renderPromise = $.Deferred().resolve().promise();
Object.keys(routes[namespace]).forEach(function(route) {
var config = routes[namespace][route];
var isMatch = route === newRoute;
if (isMatch) {
newConfig = config;
}
config.parameters.forEach(function(element) {
// Some parameters may be null, or not an element.
if (typeof element !== 'object' || element === null) {
return;
}
element.removeClass('previous');
element.attr('data-from-panel', false);
if (isMatch) {
if (fromPanel) {
// Set this attribute to let the conversation renderer know not to show a back button.
element.attr('data-from-panel', true);
}
element.removeClass('hidden');
element.attr('aria-hidden', false);
} else {
// For the message index page elements in the left panel should not be hidden.
if (!element.attr('data-in-panel')) {
element.addClass('hidden');
element.attr('aria-hidden', true);
} else if (newRoute == 'view-search' || newRoute == 'view-overview') {
element.addClass('hidden');
element.attr('aria-hidden', true);
}
}
});
});
if (newConfig) {
if (newConfig.onGo) {
renderPromise = newConfig.onGo.apply(undefined, newConfig.parameters.concat(args));
var currentFocusElement = $(document.activeElement);
var hasFocus = false;
var firstFocusable = null;
// No need to start at 0 as we know that is the namespace.
for (var i = 1; i < newConfig.parameters.length; i++) {
var element = newConfig.parameters[i];
// Some parameters may be null, or not an element.
if (typeof element !== 'object' || element === null) {
continue;
}
if (!firstFocusable) {
firstFocusable = element;
}
if (element.has(currentFocusElement).length) {
hasFocus = true;
break;
}
}
if (!hasFocus) {
// This page doesn't have focus yet so focus the first focusable
// element in the new view.
firstFocusable.find(SELECTORS.CAN_RECEIVE_FOCUS).filter(':visible').first().focus();
}
}
}
var record = {
route: newRoute,
params: args,
renderPromise: renderPromise
};
PubSub.publish(MessageDrawerEvents.ROUTE_CHANGED, record);
return record;
};
/**
* Go to a defined route and store the route history.
*
* @param {String} namespace Unique identifier for the Routes
* @return {object} record Current route record with route config name and parameters.
*/
var go = function(namespace) {
var currentFocusElement = $(document.activeElement);
var record = changeRoute.apply(namespace, arguments);
var inHistory = false;
if (!history[namespace]) {
history[namespace] = [];
}
// History stores a unique list of routes. Check to see if the new route
// is already in the history, if it is then forget all history after it.
// This ensures there are no duplicate routes in history and that it represents
// a linear path of routes (it never stores something like [foo, bar, foo])).
history[namespace] = history[namespace].reduce(function(carry, previous) {
if (previous.route === record.route) {
inHistory = true;
}
if (!inHistory) {
carry.push(previous);
}
return carry;
}, []);
var historylength = history[namespace].length;
var previousRecord = historylength ? history[namespace][historylength - 1] : null;
if (previousRecord) {
var prevConfig = routes[namespace][previousRecord.route];
var elements = prevConfig.parameters;
// The first one will be the namespace, skip it.
for (var i = 1; i < elements.length; i++) {
// Some parameters may be null, or not an element.
if (typeof elements[i] !== 'object' || elements[i] === null) {
continue;
}
elements[i].addClass('previous');
}
previousRecord.focusElement = currentFocusElement;
if (prevConfig.getDescription) {
// If the route has a description then set it on the back button for
// the new page we're displaying.
prevConfig.getDescription.apply(null, prevConfig.parameters.concat(previousRecord.params))
.then(function(description) {
return Str.get_string('backto', 'core_message', description);
})
.then(function(label) {
// Wait for the new page to finish rendering so that we know
// that the back button is visible.
return record.renderPromise.then(function() {
// Find the elements for the new route we displayed.
routes[namespace][record.route].parameters.forEach(function(element) {
// Some parameters may be null, or not an element.
if (typeof element !== 'object' || !element) {
return;
}
// Update the aria label for the back button.
element.find(SELECTORS.ROUTES_BACK).attr('aria-label', label);
});
});
})
.catch(function() {
// Silently ignore.
});
}
}
history[namespace].push(record);
return record;
};
/**
* Go back to the previous route record stored in history.
*
* @param {String} namespace Unique identifier for the Routes
*/
var back = function(namespace) {
if (history[namespace].length) {
// Remove the current route.
history[namespace].pop();
var previous = history[namespace].pop();
if (previous) {
// If we have a previous route then show it.
go.apply(undefined, [namespace, previous.route].concat(previous.params));
// Delay the focus 50 milliseconds otherwise it doesn't correctly
// focus the element for some reason...
window.setTimeout(function() {
previous.focusElement.focus();
}, 50);
}
}
};
return {
add: add,
go: go,
back: back
};
});