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Diffstat (limited to 'components/newtab/dropPreview.js')
-rw-r--r-- | components/newtab/dropPreview.js | 222 |
1 files changed, 0 insertions, 222 deletions
diff --git a/components/newtab/dropPreview.js b/components/newtab/dropPreview.js deleted file mode 100644 index fd7587a..0000000 --- a/components/newtab/dropPreview.js +++ /dev/null @@ -1,222 +0,0 @@ -#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. - */ -var 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; - } -}; |