DOMUI Prefs: Replace search engine edit overlay with inline editing.

chrome/browser/resources/options/inline_editable_list.js

+// Copyright (c) 2010 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.
+
+cr.define('options', function() {
+  const DeletableItem = options.DeletableItem;

[arv (Not doing code reviews), 2011/01/11 23:29:29]

It would be good if we could move these to cr.ui in a follow up CL.

[stuartmorgan, 2011/01/12 00:26:51]

Sure; added to my TODO list.

+  const DeletableItemList = options.DeletableItemList;
+
+  /**
+   * Creates a new list item with support for inline editing.
+   * @constructor
+   * @extends {options.DeletableListItem}
+   */
+  function InlineEditableItem() {
+    var el = cr.doc.createElement('div');
+    InlineEditableItem.decorate(el);
+    return el;
+  }
+
+  /**
+   * Decorates an element as a inline-editable list item. Note that this is
+   * a subclass of DeletableItem.
+   * @param {!HTMLElement} el The element to decorate.
+   */
+  InlineEditableItem.decorate = function(el) {
+    el.__proto__ = InlineEditableItem.prototype;
+    el.decorate();
+  };
+
+  InlineEditableItem.prototype = {
+    __proto__: DeletableItem.prototype,
+
+    /**
+     * Whether or not this item can be edited.
+     * @type {boolean}
+     * @private
+     */
+    editable_: true,
+
+    /**
+     * Whether or not the current edit should be considered cancelled, rather
+     * than committed, when editing ends.
+     * @type {boolean}
+     * @private
+     */
+    editCancelled_: true,
+
+    /** @inheritDoc */
+    decorate: function() {
+      DeletableItem.prototype.decorate.call(this);
+
+      this.addEventListener('keydown', this.handleKeyDown_.bind(this));
+    },
+
+    /** @inheritDoc */
+    selectionChanged: function() {
+      if (this.editable)
+        this.editing = this.selected;
+    },
+
+    /**
+     * Whether the user is currently editing the list item.
+     * @type {boolean}
+     */
+    get editing() {
+      return this.hasAttribute('editing');
+    },
+    set editing(editing) {
+      if (this.editing == editing)
+        return;
+
+      if (editing)
+        this.setAttribute('editing', '');
+      else
+        this.removeAttribute('editing');
+
+      if (editing) {
+        this.editCancelled_ = false;
+
+        cr.dispatchSimpleEvent(this, 'edit', true);
+
+        var focusElement = this.initialFocusElement;
+        // When this is called in response to the selectedChange event,
+        // the list grabs focus immediately afterwards. Thus we must delay
+        // our focus grab.
+        if (focusElement) {
+          window.setTimeout(function() {
+            focusElement.focus();
+            focusElement.select();
+          }, 50);
+        }
+      } else {
+        if (!this.editCancelled_ && this.hasBeenEdited() &&
+            this.currentInputIsValid) {
+          cr.dispatchSimpleEvent(this, 'commitedit', true);
+        } else {
+          cr.dispatchSimpleEvent(this, 'canceledit', true);
+        }
+      }
+    },
+
+    /**
+     * Whether the item is editable.
+     * @type {boolean}
+     */
+    get editable() {
+      return this.editable_;
+    },
+    set editable(editable) {
+      this.editable_ = editable;
+      if (!editable)
+        this.editing = false;
+    },
+
+    /**
+     * The HTML element that should have focus initially when editing starts.
+     * Should be overriden by subclasses.
+     * @type {HTMLElement}
+     */
+    get initialFocusElement() {
+      return null;
+    },
+
+    /**
+     * Whether the input in currently valid to submit. If this returns false
+     * when editing would be submitted, either editing will not be ended,
+     * or it will be cancelled, depending on the context.
+     * Can be overrided by subclasses to perform input validation.
+     */
+    get currentInputIsValid() {
+      return true;
+    },
+
+    /**
+     * Returns true if the item has been changed by an edit.
+     * Can be overrided by subclasses to return false when nothing has changed
+     * to avoid unnecessary commits.
+     */
+    hasBeenEdited: function() {
+      return true;
+    },
+
+    /**
+     * Called a key is pressed. Handles committing and cancelling edits.
+     * @param {Event} e The key down event.
+     * @private
+     */
+    handleKeyDown_: function(e) {
+      if (!this.editing)
+        return;
+
+      var endEdit = false;
+      switch (e.keyIdentifier) {
+        case 'U+001B':  // Esc
+          this.editCancelled_ = true;
+          endEdit = true;
+          break;
+        case 'Enter':
+          if (this.currentInputIsValid)
+            endEdit = true;
+          break;
+      }
+
+      if (endEdit) {
+        // Blurring will trigger the edit to end; see InlineEditableItemList.
+        this.ownerDocument.activeElement.blur();
+        // Make sure that handled keys aren't passed on and double-handled.
+        // (e.g., esc shouldn't both cancel an edit and close a subpage)
+        e.stopPropagation();
+      }
+    },
+  };
+
+  var InlineEditableItemList = cr.ui.define('list');
+
+  InlineEditableItemList.prototype = {
+    __proto__: DeletableItemList.prototype,
+
+    /** @inheritDoc */
+    decorate: function() {
+      DeletableItemList.prototype.decorate.call(this);
+      this.addEventListener('blur', this.handleBlur_.bind(this), true);
+    },
+
+    /**
+     * Called when an element in the list is blurred. Removes selection (thus
+     * ending edit) if focus moves outside the list.
+     * @param {Event} e The blur event.
+     * @private
+     */
+    handleBlur_: function(e) {
+      // When the blur event happens we do not know who is getting focus so we
+      // delay this a bit until we know if the new focus node is outside the
+      // list.
+      var list = this;
+      var doc = e.target.ownerDocument;
+      window.setTimeout(function() {
+        var activeElement = doc.activeElement;
+        if (!list.contains(activeElement))
+          list.selectionModel.unselectAll();
+      }, 50);
+    },
+  };
+
+  // Export
+  return {
+    InlineEditableItem: InlineEditableItem,
+    InlineEditableItemList: InlineEditableItemList,
+  };
+});