Files.app: Introduce check-select mode.

ui/file_manager/file_manager/foreground/js/ui/file_list_selection_model.js

Index: ui/file_manager/file_manager/foreground/js/ui/file_list_selection_model.js
diff --git a/ui/file_manager/file_manager/foreground/js/ui/file_list_selection_model.js b/ui/file_manager/file_manager/foreground/js/ui/file_list_selection_model.js
new file mode 100644
index 0000000000000000000000000000000000000000..77589fb956dc7bbc2cfc97c43e9caa0c10dae695
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+++ b/ui/file_manager/file_manager/foreground/js/ui/file_list_selection_model.js
@@ -0,0 +1,89 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/**
+ * @param {number=} opt_length The number items in the selection.
+ * @constructor
+ * @extends {cr.ui.ListSelectionModel}
+ * @struct
+ * @suppress {checkStructDictInheritance}
+ */
+function FileListSelectionModel(opt_length) {
+  cr.ui.ListSelectionModel.call(this, opt_length);
+
+  /** @private {boolean} */
+  this.isCheckSelectMode_ = false;
+
+  this.addEventListener('change', this.onChangeEvent_.bind(this));
+}
+
+FileListSelectionModel.prototype = /** @struct */ {
+  __proto__: cr.ui.ListSelectionModel.prototype
+};
+
+/**
+ * Updates the check-select mode.
+ * @param {boolean} enabled True if check-select mode should be enabled.
+ */
+FileListSelectionModel.prototype.setCheckSelectMode = function(enabled) {
+  this.isCheckSelectMode_ = enabled;
+};
+
+/**
+ * Gets the check-select mode.
+ * @return {boolean} True if check-select mode is enabled.
+ */
+FileListSelectionModel.prototype.getCheckSelectMode = function() {
+  return this.isCheckSelectMode_;
+};
+
+/**
+ * Handles change event to update isCheckSelectMode_ BEFORE the change event is
+ * dispatched to other listeners.
+ * @param {!Event} event Event object of 'change' event.
+ * @private
+ */
+FileListSelectionModel.prototype.onChangeEvent_ = function(event) {
+  // When the number of selected item is not one, update che check-select mode.
+  // When the number of selected item is one, the mode depends on the last
+  // keyboard/mouse operation. In this case, the mode is controlled from
+  // outside. See filelist.handlePointerDownUp and filelist.handleKeyDown.
+  var selectedIndexes = this.selectedIndexes;
+  if (selectedIndexes.length === 0) {
+    this.isCheckSelectMode_ = false;
+  } else if (selectedIndexes.length >= 2) {
+    this.isCheckSelectMode_ = true;
+  }
+};
+
+/**
+ * @param {number=} opt_length The number items in the selection.
+ * @constructor
+ * @extends {cr.ui.ListSingleSelectionModel}
+ * @struct
+ * @suppress {checkStructDictInheritance}
+ */
+function FileListSingleSelectionModel(opt_length) {
+  cr.ui.ListSingleSelectionModel.call(this, opt_length);
+}
+
+FileListSingleSelectionModel.prototype = /** @struct */ {
+  __proto__: cr.ui.ListSingleSelectionModel.prototype
+};
+
+/**
+ * Updates the check-select mode.
+ * @param {boolean} enabled True if check-select mode should be enabled.
+ */
+FileListSingleSelectionModel.prototype.setCheckSelectMode = function(enabled) {
+  // Do nothing, as check-select mode is invalid in single selection model.
+};
+
+/**
+ * Gets the check-select mode.
+ * @return {boolean} True if check-select mode is enabled.
+ */
+FileListSingleSelectionModel.prototype.getCheckSelectMode = function() {
+  return false;
+};