1 files changed, 171 insertions, 0 deletions
diff --git a/browser/base/content/newtab/grid.js b/browser/base/content/newtab/grid.js
new file mode 100644
index 000000000..120691951
--- /dev/null
+++ b/browser/base/content/newtab/grid.js
@@ -0,0 +1,171 @@
+#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 represents the grid that contains all sites.
+ */
+let gGrid = {
+  /**
+   * The DOM node of the grid.
+   */
+  _node: null,
+  get node() this._node,
+
+  /**
+   * The cached DOM fragment for sites.
+   */
+  _siteFragment: null,
+
+  /**
+   * All cells contained in the grid.
+   */
+  _cells: null,
+  get cells() this._cells,
+
+  /**
+   * All sites contained in the grid's cells. Sites may be empty.
+   */
+  get sites() [cell.site for each (cell in this.cells)],
+
+  // Tells whether the grid has already been initialized.
+  get ready() !!this._node,
+
+  /**
+   * Initializes the grid.
+   * @param aSelector The query selector of the grid.
+   */
+  init: function Grid_init() {
+    this._node = document.getElementById("newtab-grid");
+    this._createSiteFragment();
+    this._render();
+  },
+
+  /**
+   * Creates a new site in the grid.
+   * @param aLink The new site's link.
+   * @param aCell The cell that will contain the new site.
+   * @return The newly created site.
+   */
+  createSite: function Grid_createSite(aLink, aCell) {
+    let node = aCell.node;
+    node.appendChild(this._siteFragment.cloneNode(true));
+    return new Site(node.firstElementChild, aLink);
+  },
+
+  /**
+   * Refreshes the grid and re-creates all sites.
+   */
+  refresh: function Grid_refresh() {
+    // Remove all sites.
+    this.cells.forEach(function (cell) {
+      let node = cell.node;
+      let child = node.firstElementChild;
+
+      if (child)
+        node.removeChild(child);
+    }, this);
+
+    // Render the grid again.
+    this._render();
+  },
+
+  /**
+   * Locks the grid to block all pointer events.
+   */
+  lock: function Grid_lock() {
+    this.node.setAttribute("locked", "true");
+  },
+
+  /**
+   * Unlocks the grid to allow all pointer events.
+   */
+  unlock: function Grid_unlock() {
+    this.node.removeAttribute("locked");
+  },
+
+  /**
+   * Creates the newtab grid.
+   */
+  _renderGrid: function Grid_renderGrid() {
+    let row = document.createElementNS(HTML_NAMESPACE, "div");
+    let cell = document.createElementNS(HTML_NAMESPACE, "div");
+    row.classList.add("newtab-row");
+    cell.classList.add("newtab-cell");
+
+    // Clear the grid
+    this._node.innerHTML = "";
+
+    // Creates the structure of one row
+    for (let i = 0; i < gGridPrefs.gridColumns; i++) {
+      row.appendChild(cell.cloneNode(true));
+    }
+    // Creates the grid
+    for (let j = 0; j < gGridPrefs.gridRows; j++) {
+      this._node.appendChild(row.cloneNode(true));
+    }
+
+    // (Re-)initialize all cells.
+    let cellElements = this.node.querySelectorAll(".newtab-cell");
+    this._cells = [new Cell(this, cell) for (cell of cellElements)];
+  },
+
+  /**
+   * Creates the DOM fragment that is re-used when creating sites.
+   */
+  _createSiteFragment: function Grid_createSiteFragment() {
+    let site = document.createElementNS(HTML_NAMESPACE, "div");
+    site.classList.add("newtab-site");
+    site.setAttribute("draggable", "true");
+
+    // Create the site's inner HTML code.
+    site.innerHTML =
+      '<a class="newtab-link">' +
+      '  <span class="newtab-thumbnail"/>' +
+      '  <span class="newtab-title"/>' +
+      '</a>' +
+      '<input type="button" title="' + newTabString("pin") + '"' +
+      '       class="newtab-control newtab-control-pin"/>' +
+      '<input type="button" title="' + newTabString("block") + '"' +
+      '       class="newtab-control newtab-control-block"/>';
+
+    this._siteFragment = document.createDocumentFragment();
+    this._siteFragment.appendChild(site);
+  },
+
+  /**
+   * Renders the sites, creates all sites and puts them into their cells.
+   */
+  _renderSites: function Grid_renderSites() {
+    let cells = this.cells;
+    // Put sites into the cells.
+    let links = gLinks.getLinks();
+    let length = Math.min(links.length, cells.length);
+
+    for (let i = 0; i < length; i++) {
+      if (links[i])
+        this.createSite(links[i], cells[i]);
+    }
+  },
+
+  /**
+   * Renders the grid.
+   */
+  _render: function Grid_render() {
+    if (this._shouldRenderGrid()) {
+      this._renderGrid();
+    }
+
+    this._renderSites();
+  },
+
+  _shouldRenderGrid : function Grid_shouldRenderGrid() {
+    let rowsLength = this._node.querySelectorAll(".newtab-row").length;
+    let cellsLength = this._node.querySelectorAll(".newtab-cell").length;
+
+    return (rowsLength != gGridPrefs.gridRows ||
+            cellsLength != (gGridPrefs.gridRows * gGridPrefs.gridColumns));
+  }
+};