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+/* 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/. */
+
+[ChromeOnly,
+ Exposed=Window]
+interface TreeColumns {
+ /**
+ * The tree widget for these columns.
+ */
+ readonly attribute XULTreeElement? tree;
+
+ /**
+ * The number of columns.
+ */
+ readonly attribute unsigned long count;
+
+ /**
+ * An alias for count (for the benefit of scripts which treat this as an
+ * array).
+ */
+ readonly attribute unsigned long length;
+
+ /**
+ * Get the first/last column.
+ */
+ TreeColumn? getFirstColumn();
+ TreeColumn? getLastColumn();
+
+ /**
+ * Attribute based column getters.
+ */
+ TreeColumn? getPrimaryColumn();
+ TreeColumn? getSortedColumn();
+ TreeColumn? getKeyColumn();
+
+ /**
+ * Get the column for the given element.
+ */
+ TreeColumn? getColumnFor(Element? element);
+
+ /**
+ * Parametric column getters.
+ */
+ getter TreeColumn? getNamedColumn(DOMString name);
+ getter TreeColumn? getColumnAt(unsigned long index);
+
+ /**
+ * This method is called whenever a treecol is added or removed and
+ * the column cache needs to be rebuilt.
+ */
+ undefined invalidateColumns();
+};