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// 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)
* @author ajp@google.com (Andy Perelson)
*/
goog.provide('goog.editor.plugins.SpacesTabHandler');
goog.require('goog.dom');
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}
*/
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;
};
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