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127 lines
3.0 KiB
JavaScript
127 lines
3.0 KiB
JavaScript
#ifdef 0
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#endif
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/**
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* This class manages a cell's DOM node (not the actually cell content, a site).
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* It's mostly read-only, i.e. all manipulation of both position and content
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* aren't handled here.
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*/
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function Cell(aGrid, aNode) {
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this._grid = aGrid;
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this._node = aNode;
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this._node._newtabCell = this;
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// Register drag-and-drop event handlers.
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["dragenter", "dragover", "dragexit", "drop"].forEach(function (aType) {
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this._node.addEventListener(aType, this, false);
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}, this);
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}
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Cell.prototype = {
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/**
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* The grid.
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*/
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_grid: null,
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/**
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* The cell's DOM node.
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*/
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get node() { return this._node; },
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/**
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* The cell's offset in the grid.
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*/
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get index() {
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let index = this._grid.cells.indexOf(this);
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// Cache this value, overwrite the getter.
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Object.defineProperty(this, "index", {value: index, enumerable: true});
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return index;
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},
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/**
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* The previous cell in the grid.
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*/
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get previousSibling() {
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let prev = this.node.previousElementSibling;
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prev = prev && prev._newtabCell;
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// Cache this value, overwrite the getter.
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Object.defineProperty(this, "previousSibling", {value: prev, enumerable: true});
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return prev;
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},
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/**
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* The next cell in the grid.
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*/
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get nextSibling() {
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let next = this.node.nextElementSibling;
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next = next && next._newtabCell;
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// Cache this value, overwrite the getter.
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Object.defineProperty(this, "nextSibling", {value: next, enumerable: true});
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return next;
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},
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/**
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* The site contained in the cell, if any.
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*/
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get site() {
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let firstChild = this.node.firstElementChild;
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return firstChild && firstChild._newtabSite;
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},
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/**
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* Checks whether the cell contains a pinned site.
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* @return Whether the cell contains a pinned site.
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*/
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containsPinnedSite: function Cell_containsPinnedSite() {
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let site = this.site;
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return site && site.isPinned();
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},
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/**
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* Checks whether the cell contains a site (is empty).
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* @return Whether the cell is empty.
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*/
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isEmpty: function Cell_isEmpty() {
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return !this.site;
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},
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/**
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* Handles all cell events.
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*/
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handleEvent: function Cell_handleEvent(aEvent) {
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// We're not responding to external drag/drop events
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// when our parent window is in private browsing mode.
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if (inPrivateBrowsingMode() && !gDrag.draggedSite)
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return;
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if (aEvent.type != "dragexit" && !gDrag.isValid(aEvent))
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return;
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switch (aEvent.type) {
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case "dragenter":
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aEvent.preventDefault();
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gDrop.enter(this, aEvent);
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break;
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case "dragover":
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aEvent.preventDefault();
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break;
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case "dragexit":
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gDrop.exit(this, aEvent);
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break;
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case "drop":
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aEvent.preventDefault();
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gDrop.drop(this, aEvent);
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break;
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}
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}
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};
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