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+#ifdef 0
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+#endif
+
+/**
+ * This singleton provides functionality to update the current grid to a new
+ * set of pinned and blocked sites. It adds, moves and removes sites.
+ */
+var gUpdater = {
+ /**
+ * Updates the current grid according to its pinned and blocked sites.
+ * This removes old, moves existing and creates new sites to fill gaps.
+ * @param aCallback The callback to call when finished.
+ */
+ updateGrid: function Updater_updateGrid(aCallback) {
+ let links = gLinks.getLinks().slice(0, gGrid.cells.length);
+
+ // Find all sites that remain in the grid.
+ let sites = this._findRemainingSites(links);
+
+ // Remove sites that are no longer in the grid.
+ this._removeLegacySites(sites, () => {
+ // Freeze all site positions so that we can move their DOM nodes around
+ // without any visual impact.
+ this._freezeSitePositions(sites);
+
+ // Move the sites' DOM nodes to their new position in the DOM. This will
+ // have no visual effect as all the sites have been frozen and will
+ // remain in their current position.
+ this._moveSiteNodes(sites);
+
+ // Now it's time to animate the sites actually moving to their new
+ // positions.
+ this._rearrangeSites(sites, () => {
+ // Try to fill empty cells and finish.
+ this._fillEmptyCells(links, aCallback);
+
+ // Update other pages that might be open to keep them synced.
+ gAllPages.update(gPage);
+ });
+ });
+ },
+
+ /**
+ * Takes an array of links and tries to correlate them to sites contained in
+ * the current grid. If no corresponding site can be found (i.e. the link is
+ * new and a site will be created) then just set it to null.
+ * @param aLinks The array of links to find sites for.
+ * @return Array of sites mapped to the given links (can contain null values).
+ */
+ _findRemainingSites: function Updater_findRemainingSites(aLinks) {
+ let map = {};
+
+ // Create a map to easily retrieve the site for a given URL.
+ gGrid.sites.forEach(function (aSite) {
+ if (aSite)
+ map[aSite.url] = aSite;
+ });
+
+ // Map each link to its corresponding site, if any.
+ return aLinks.map(function (aLink) {
+ return aLink && (aLink.url in map) && map[aLink.url];
+ });
+ },
+
+ /**
+ * Freezes the given sites' positions.
+ * @param aSites The array of sites to freeze.
+ */
+ _freezeSitePositions: function Updater_freezeSitePositions(aSites) {
+ aSites.forEach(function (aSite) {
+ if (aSite)
+ gTransformation.freezeSitePosition(aSite);
+ });
+ },
+
+ /**
+ * Moves the given sites' DOM nodes to their new positions.
+ * @param aSites The array of sites to move.
+ */
+ _moveSiteNodes: function Updater_moveSiteNodes(aSites) {
+ let cells = gGrid.cells;
+
+ // Truncate the given array of sites to not have more sites than cells.
+ // This can happen when the user drags a bookmark (or any other new kind
+ // of link) onto the grid.
+ let sites = aSites.slice(0, cells.length);
+
+ sites.forEach(function (aSite, aIndex) {
+ let cell = cells[aIndex];
+ let cellSite = cell.site;
+
+ // The site's position didn't change.
+ if (!aSite || cellSite != aSite) {
+ let cellNode = cell.node;
+
+ // Empty the cell if necessary.
+ if (cellSite)
+ cellNode.removeChild(cellSite.node);
+
+ // Put the new site in place, if any.
+ if (aSite)
+ cellNode.appendChild(aSite.node);
+ }
+ }, this);
+ },
+
+ /**
+ * Rearranges the given sites and slides them to their new positions.
+ * @param aSites The array of sites to re-arrange.
+ * @param aCallback The callback to call when finished.
+ */
+ _rearrangeSites: function Updater_rearrangeSites(aSites, aCallback) {
+ let options = {callback: aCallback, unfreeze: true};
+ gTransformation.rearrangeSites(aSites, options);
+ },
+
+ /**
+ * Removes all sites from the grid that are not in the given links array or
+ * exceed the grid.
+ * @param aSites The array of sites remaining in the grid.
+ * @param aCallback The callback to call when finished.
+ */
+ _removeLegacySites: function Updater_removeLegacySites(aSites, aCallback) {
+ let batch = [];
+
+ // Delete sites that were removed from the grid.
+ gGrid.sites.forEach(function (aSite) {
+ // The site must be valid and not in the current grid.
+ if (!aSite || aSites.indexOf(aSite) != -1)
+ return;
+
+ batch.push(new Promise(resolve => {
+ // Fade out the to-be-removed site.
+ gTransformation.hideSite(aSite, function () {
+ let node = aSite.node;
+
+ // Remove the site from the DOM.
+ node.parentNode.removeChild(node);
+ resolve();
+ });
+ }));
+ });
+
+ Promise.all(batch).then(aCallback);
+ },
+
+ /**
+ * Tries to fill empty cells with new links if available.
+ * @param aLinks The array of links.
+ * @param aCallback The callback to call when finished.
+ */
+ _fillEmptyCells: function Updater_fillEmptyCells(aLinks, aCallback) {
+ let {cells, sites} = gGrid;
+
+ // Find empty cells and fill them.
+ Promise.all(sites.map((aSite, aIndex) => {
+ if (aSite || !aLinks[aIndex])
+ return null;
+
+ return new Promise(resolve => {
+ // Create the new site and fade it in.
+ let site = gGrid.createSite(aLinks[aIndex], cells[aIndex]);
+
+ // Set the site's initial opacity to zero.
+ site.node.style.opacity = 0;
+
+ // Flush all style changes for the dynamically inserted site to make
+ // the fade-in transition work.
+ window.getComputedStyle(site.node).opacity;
+ gTransformation.showSite(site, resolve);
+ });
+ })).then(aCallback).catch(console.exception);
+ }
+};