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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
+
+// A little delay that prevents the grid from being too sensitive when dragging
+// sites around.
+const DELAY_REARRANGE_MS = 100;
+
+/**
+ * This singleton implements site dropping functionality.
+ */
+let gDrop = {
+ /**
+ * The last drop target.
+ */
+ _lastDropTarget: null,
+
+ /**
+ * Handles the 'dragenter' event.
+ * @param aCell The drop target cell.
+ */
+ enter: function Drop_enter(aCell) {
+ this._delayedRearrange(aCell);
+ },
+
+ /**
+ * Handles the 'dragexit' event.
+ * @param aCell The drop target cell.
+ * @param aEvent The 'dragexit' event.
+ */
+ exit: function Drop_exit(aCell, aEvent) {
+ if (aEvent.dataTransfer && !aEvent.dataTransfer.mozUserCancelled) {
+ this._delayedRearrange();
+ } else {
+ // The drag operation has been cancelled.
+ this._cancelDelayedArrange();
+ this._rearrange();
+ }
+ },
+
+ /**
+ * Handles the 'drop' event.
+ * @param aCell The drop target cell.
+ * @param aEvent The 'dragexit' event.
+ */
+ drop: function Drop_drop(aCell, aEvent) {
+ // The cell that is the drop target could contain a pinned site. We need
+ // to find out where that site has gone and re-pin it there.
+ if (aCell.containsPinnedSite())
+ this._repinSitesAfterDrop(aCell);
+
+ // Pin the dragged or insert the new site.
+ this._pinDraggedSite(aCell, aEvent);
+
+ this._cancelDelayedArrange();
+
+ // Update the grid and move all sites to their new places.
+ gUpdater.updateGrid();
+ },
+
+ /**
+ * Re-pins all pinned sites in their (new) positions.
+ * @param aCell The drop target cell.
+ */
+ _repinSitesAfterDrop: function Drop_repinSitesAfterDrop(aCell) {
+ let sites = gDropPreview.rearrange(aCell);
+
+ // Filter out pinned sites.
+ let pinnedSites = sites.filter(function (aSite) {
+ return aSite && aSite.isPinned();
+ });
+
+ // Re-pin all shifted pinned cells.
+ pinnedSites.forEach(aSite => aSite.pin(sites.indexOf(aSite)));
+ },
+
+ /**
+ * Pins the dragged site in its new place.
+ * @param aCell The drop target cell.
+ * @param aEvent The 'dragexit' event.
+ */
+ _pinDraggedSite: function Drop_pinDraggedSite(aCell, aEvent) {
+ let index = aCell.index;
+ let draggedSite = gDrag.draggedSite;
+
+ if (draggedSite) {
+ // Pin the dragged site at its new place.
+ if (aCell != draggedSite.cell)
+ draggedSite.pin(index);
+ } else {
+ let link = gDragDataHelper.getLinkFromDragEvent(aEvent);
+ if (link) {
+ // A new link was dragged onto the grid. Create it by pinning its URL.
+ gPinnedLinks.pin(link, index);
+
+ // Make sure the newly added link is not blocked.
+ gBlockedLinks.unblock(link);
+ }
+ }
+ },
+
+ /**
+ * Time a rearrange with a little delay.
+ * @param aCell The drop target cell.
+ */
+ _delayedRearrange: function Drop_delayedRearrange(aCell) {
+ // The last drop target didn't change so there's no need to re-arrange.
+ if (this._lastDropTarget == aCell)
+ return;
+
+ let self = this;
+
+ function callback() {
+ self._rearrangeTimeout = null;
+ self._rearrange(aCell);
+ }
+
+ this._cancelDelayedArrange();
+ this._rearrangeTimeout = setTimeout(callback, DELAY_REARRANGE_MS);
+
+ // Store the last drop target.
+ this._lastDropTarget = aCell;
+ },
+
+ /**
+ * Cancels a timed rearrange, if any.
+ */
+ _cancelDelayedArrange: function Drop_cancelDelayedArrange() {
+ if (this._rearrangeTimeout) {
+ clearTimeout(this._rearrangeTimeout);
+ this._rearrangeTimeout = null;
+ }
+ },
+
+ /**
+ * Rearrange all sites in the grid depending on the current drop target.
+ * @param aCell The drop target cell.
+ */
+ _rearrange: function Drop_rearrange(aCell) {
+ let sites = gGrid.sites;
+
+ // We need to rearrange the grid only if there's a current drop target.
+ if (aCell)
+ sites = gDropPreview.rearrange(aCell);
+
+ gTransformation.rearrangeSites(sites, {unfreeze: !aCell});
+ }
+};