/**
* @license
* Copyright The Closure Library Authors.
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @fileoverview Editor plugin to handle tab keys not in lists to add 4 spaces.
*/
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() {
'use strict';
goog.editor.plugins.AbstractTabHandler.call(this);
};
goog.inherits(
goog.editor.plugins.SpacesTabHandler,
goog.editor.plugins.AbstractTabHandler);
/** @override */
goog.editor.plugins.SpacesTabHandler.prototype.getTrogClassId = function() {
'use strict';
return 'SpacesTabHandler';
};
/** @override */
goog.editor.plugins.SpacesTabHandler.prototype.handleTabKey = function(e) {
'use strict';
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(goog.dom.TagName.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;
};