From 49ee0794b5d912db1f95dce6eb52d781dc210db5 Mon Sep 17 00:00:00 2001 From: "Matt A. Tobin" Date: Fri, 2 Feb 2018 03:35:06 -0500 Subject: Add Pale Moon --- .../palemoon/base/content/newtab/dropPreview.js | 222 +++++++++++++++++++++ 1 file changed, 222 insertions(+) create mode 100644 application/palemoon/base/content/newtab/dropPreview.js (limited to 'application/palemoon/base/content/newtab/dropPreview.js') diff --git a/application/palemoon/base/content/newtab/dropPreview.js b/application/palemoon/base/content/newtab/dropPreview.js new file mode 100644 index 000000000..903762345 --- /dev/null +++ b/application/palemoon/base/content/newtab/dropPreview.js @@ -0,0 +1,222 @@ +#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 the ability to re-arrange the current grid to + * indicate the transformation that results from dropping a cell at a certain + * position. + */ +let gDropPreview = { + /** + * Rearranges the sites currently contained in the grid when a site would be + * dropped onto the given cell. + * @param aCell The drop target cell. + * @return The re-arranged array of sites. + */ + rearrange: function DropPreview_rearrange(aCell) { + let sites = gGrid.sites; + + // Insert the dragged site into the current grid. + this._insertDraggedSite(sites, aCell); + + // After the new site has been inserted we need to correct the positions + // of all pinned tabs that have been moved around. + this._repositionPinnedSites(sites, aCell); + + return sites; + }, + + /** + * Inserts the currently dragged site into the given array of sites. + * @param aSites The array of sites to insert into. + * @param aCell The drop target cell. + */ + _insertDraggedSite: function DropPreview_insertDraggedSite(aSites, aCell) { + let dropIndex = aCell.index; + let draggedSite = gDrag.draggedSite; + + // We're currently dragging a site. + if (draggedSite) { + let dragCell = draggedSite.cell; + let dragIndex = dragCell.index; + + // Move the dragged site into its new position. + if (dragIndex != dropIndex) { + aSites.splice(dragIndex, 1); + aSites.splice(dropIndex, 0, draggedSite); + } + // We're handling an external drag item. + } else { + aSites.splice(dropIndex, 0, null); + } + }, + + /** + * Correct the position of all pinned sites that might have been moved to + * different positions after the dragged site has been inserted. + * @param aSites The array of sites containing the dragged site. + * @param aCell The drop target cell. + */ + _repositionPinnedSites: + function DropPreview_repositionPinnedSites(aSites, aCell) { + + // Collect all pinned sites. + let pinnedSites = this._filterPinnedSites(aSites, aCell); + + // Correct pinned site positions. + pinnedSites.forEach(function (aSite) { + aSites[aSites.indexOf(aSite)] = aSites[aSite.cell.index]; + aSites[aSite.cell.index] = aSite; + }, this); + + // There might be a pinned cell that got pushed out of the grid, try to + // sneak it in by removing a lower-priority cell. + if (this._hasOverflowedPinnedSite(aSites, aCell)) + this._repositionOverflowedPinnedSite(aSites, aCell); + }, + + /** + * Filter pinned sites out of the grid that are still on their old positions + * and have not moved. + * @param aSites The array of sites to filter. + * @param aCell The drop target cell. + * @return The filtered array of sites. + */ + _filterPinnedSites: function DropPreview_filterPinnedSites(aSites, aCell) { + let draggedSite = gDrag.draggedSite; + + // When dropping on a cell that contains a pinned site make sure that all + // pinned cells surrounding the drop target are moved as well. + let range = this._getPinnedRange(aCell); + + return aSites.filter(function (aSite, aIndex) { + // The site must be valid, pinned and not the dragged site. + if (!aSite || aSite == draggedSite || !aSite.isPinned()) + return false; + + let index = aSite.cell.index; + + // If it's not in the 'pinned range' it's a valid pinned site. + return (index > range.end || index < range.start); + }); + }, + + /** + * Determines the range of pinned sites surrounding the drop target cell. + * @param aCell The drop target cell. + * @return The range of pinned cells. + */ + _getPinnedRange: function DropPreview_getPinnedRange(aCell) { + let dropIndex = aCell.index; + let range = {start: dropIndex, end: dropIndex}; + + // We need a pinned range only when dropping on a pinned site. + if (aCell.containsPinnedSite()) { + let links = gPinnedLinks.links; + + // Find all previous siblings of the drop target that are pinned as well. + while (range.start && links[range.start - 1]) + range.start--; + + let maxEnd = links.length - 1; + + // Find all next siblings of the drop target that are pinned as well. + while (range.end < maxEnd && links[range.end + 1]) + range.end++; + } + + return range; + }, + + /** + * Checks if the given array of sites contains a pinned site that has + * been pushed out of the grid. + * @param aSites The array of sites to check. + * @param aCell The drop target cell. + * @return Whether there is an overflowed pinned cell. + */ + _hasOverflowedPinnedSite: + function DropPreview_hasOverflowedPinnedSite(aSites, aCell) { + + // If the drop target isn't pinned there's no way a pinned site has been + // pushed out of the grid so we can just exit here. + if (!aCell.containsPinnedSite()) + return false; + + let cells = gGrid.cells; + + // No cells have been pushed out of the grid, nothing to do here. + if (aSites.length <= cells.length) + return false; + + let overflowedSite = aSites[cells.length]; + + // Nothing to do if the site that got pushed out of the grid is not pinned. + return (overflowedSite && overflowedSite.isPinned()); + }, + + /** + * We have a overflowed pinned site that we need to re-position so that it's + * visible again. We try to find a lower-priority cell (empty or containing + * an unpinned site) that we can move it to. + * @param aSites The array of sites. + * @param aCell The drop target cell. + */ + _repositionOverflowedPinnedSite: + function DropPreview_repositionOverflowedPinnedSite(aSites, aCell) { + + // Try to find a lower-priority cell (empty or containing an unpinned site). + let index = this._indexOfLowerPrioritySite(aSites, aCell); + + if (index > -1) { + let cells = gGrid.cells; + let dropIndex = aCell.index; + + // Move all pinned cells to their new positions to let the overflowed + // site fit into the grid. + for (let i = index + 1, lastPosition = index; i < aSites.length; i++) { + if (i != dropIndex) { + aSites[lastPosition] = aSites[i]; + lastPosition = i; + } + } + + // Finally, remove the overflowed site from its previous position. + aSites.splice(cells.length, 1); + } + }, + + /** + * Finds the index of the last cell that is empty or contains an unpinned + * site. These are considered to be of a lower priority. + * @param aSites The array of sites. + * @param aCell The drop target cell. + * @return The cell's index. + */ + _indexOfLowerPrioritySite: + function DropPreview_indexOfLowerPrioritySite(aSites, aCell) { + + let cells = gGrid.cells; + let dropIndex = aCell.index; + + // Search (beginning with the last site in the grid) for a site that is + // empty or unpinned (an thus lower-priority) and can be pushed out of the + // grid instead of the pinned site. + for (let i = cells.length - 1; i >= 0; i--) { + // The cell that is our drop target is not a good choice. + if (i == dropIndex) + continue; + + let site = aSites[i]; + + // We can use the cell only if it's empty or the site is un-pinned. + if (!site || !site.isPinned()) + return i; + } + + return -1; + } +}; -- cgit v1.2.3