| // Copyright 2008 The Closure Library Authors. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS-IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| /** |
| * @fileoverview Editor plugin to handle tab keys not in lists to add 4 spaces. |
| * |
| * @author robbyw@google.com (Robby Walker) |
| */ |
| |
| goog.provide('goog.editor.plugins.SpacesTabHandler'); |
| |
| goog.require('goog.dom.TagName'); |
| goog.require('goog.editor.plugins.AbstractTabHandler'); |
| goog.require('goog.editor.range'); |
| |
| |
| |
| /** |
| * Plugin to handle tab keys when not in lists to add 4 spaces. |
| * @constructor |
| * @extends {goog.editor.plugins.AbstractTabHandler} |
| * @final |
| */ |
| goog.editor.plugins.SpacesTabHandler = function() { |
| goog.editor.plugins.AbstractTabHandler.call(this); |
| }; |
| goog.inherits(goog.editor.plugins.SpacesTabHandler, |
| goog.editor.plugins.AbstractTabHandler); |
| |
| |
| /** @override */ |
| goog.editor.plugins.SpacesTabHandler.prototype.getTrogClassId = function() { |
| return 'SpacesTabHandler'; |
| }; |
| |
| |
| /** @override */ |
| goog.editor.plugins.SpacesTabHandler.prototype.handleTabKey = function(e) { |
| var dh = this.getFieldDomHelper(); |
| var range = this.getFieldObject().getRange(); |
| if (!goog.editor.range.intersectsTag(range, goog.dom.TagName.LI)) { |
| // In the shift + tab case we don't want to insert spaces, but we don't |
| // want focus to move either so skip the spacing logic and just prevent |
| // default. |
| if (!e.shiftKey) { |
| // Not in a list but we want to insert 4 spaces. |
| |
| // Stop change events while we make multiple field changes. |
| this.getFieldObject().stopChangeEvents(true, true); |
| |
| // Inserting nodes below completely messes up the selection, doing the |
| // deletion here before it's messed up. Only delete if text is selected, |
| // otherwise we would remove the character to the right of the cursor. |
| if (!range.isCollapsed()) { |
| dh.getDocument().execCommand('delete', false, null); |
| // Safari 3 has some DOM exceptions if we don't reget the range here, |
| // doing it all the time just to be safe. |
| range = this.getFieldObject().getRange(); |
| } |
| |
| // Emulate tab by removing selection and inserting 4 spaces |
| // Two breaking spaces in a row can be collapsed by the browser into one |
| // space. Inserting the string below because it is guaranteed to never |
| // collapse to less than four spaces, regardless of what is adjacent to |
| // the inserted spaces. This might make line wrapping slightly |
| // sub-optimal around a grouping of non-breaking spaces. |
| var elem = dh.createDom('span', null, '\u00a0\u00a0 \u00a0'); |
| elem = range.insertNode(elem, false); |
| |
| this.getFieldObject().dispatchChange(); |
| goog.editor.range.placeCursorNextTo(elem, false); |
| this.getFieldObject().dispatchSelectionChangeEvent(); |
| } |
| |
| e.preventDefault(); |
| return true; |
| } |
| |
| return false; |
| }; |
| |