percentage-fontsize implementation that allows

specifying font size as a percent value as used in phpBB system.

src/lib/SCEditor.js

@@ -2250,6 +2250,18 @@ export default function SCEditor(original, userOptions) {
 		updateActiveButtons();
 	};
 
+	/**
+	 * Returns list of tags from the WYSIWYG editor
+	 *
+	 * @param {string} tagName
+	 * @function
+	 * @name execCommand
+	 * @memberOf SCEditor.prototype
+	 */
+	base.wysiwygGetTags = function (tagName) {
+		return wysiwygDocument.getElementsByTagName(tagName);
+	};
+
 	/**
 	 * Checks if the current selection has changed and triggers
 	 * the selectionchanged event if it has.

src/plugins/percentage-fontsize.js

@@ -0,0 +1,134 @@
+/**
+ * SCEditor Inline-Code Plugin for BBCode format
+ * http://www.sceditor.com/
+ *
+ * Copyright (C) 2011-2013, Sam Clarke (samclarke.com)
+ *
+ * SCEditor is licensed under the MIT license:
+ *	http://www.opensource.org/licenses/mit-license.php
+ *
+ * @fileoverview SCEditor percentage fontsize plugin for BBCode format
+ * This plugin allow usage of the percent indication in font size bbcode tag
+ * in a format used in phpBB system:
+ * [size=50]text[/font]
+ * means the text will be shown with font 50% of the current size
+ * [size=200]text[/font]
+ * means the text will be shown with font 200% of the current size
+ * @author Alex Betis
+ */
+
+(function (sceditor) {
+	'use strict';
+
+	var dom = sceditor.dom;
+
+	sceditor.plugins['percentage-fontsize'] = function () {
+		var base = this;
+
+		/**
+		 * Default sizes
+		 * @type {Object}
+		 * @private
+		 */
+		var sizes = [50, 75, 100, 150, 200];
+
+		/**
+		 * Private functions
+		 * @private
+		 */
+		var	commandHandler;
+
+		base.init = function () {
+			var	opts  = this.opts;
+
+			// Enable for BBCode only
+			if (opts.format && opts.format !== 'bbcode') {
+				return;
+			}
+
+			// The plugin will override current fontsize implementation
+			sceditor.command.set('size', {
+				exec: commandHandler,
+				txtExec: commandHandler,
+				tooltip: 'Font Size'
+			});
+
+			sceditor.formats.bbcode.set('size', {
+				tags: {
+					font: {
+						size: null
+					}
+				},
+				styles: {
+					'font-size': null
+				},
+				format: function (element, content) {
+					var	fontSize = dom.attr(element, 'size');
+					var size = 3;
+
+					if (!fontSize) {
+						fontSize = element.style['font-size'];
+					}
+
+					// remove "%" from the option
+					size = fontSize.replace('%', '');
+
+					return '[size=' + size + ']' + content + '[/size]';
+				},
+				html: '<font style="font-size:{defaultattr}%">{!0}</font>'
+			});
+		};
+
+		/**
+		 * Function for the txtExec and exec properties
+		 *
+		 * @param  {node} caller
+		 * @private
+		 */
+		commandHandler = function (caller) {
+			var	editor = this;
+			var content = document.createElement('div');
+
+			sceditor.utils.each(sizes, function (index, size) {
+				var link = document.createElement('a');
+				var font = document.createElement('font');
+				link.className = 'sceditor-fontsize-option';
+				link.setAttribute('data-size', size);
+				font.textContent = size + '%';
+				font.style.fontSize = size + '%';
+				link.appendChild(font);
+				link.addEventListener('click', function (e) {
+					var size = dom.attr(this, 'data-size');
+
+					editor.closeDropDown(true);
+
+					if (editor.sourceMode()) {
+						editor.insert('[size=' + size + ']', '[/size]');
+					} else {
+						// execCommand for fontsize accepts only numbers
+						// from 1 to 7, and it was deprecated!
+						// We'll set it to 3 and go over all the font tags with
+						// size 3 and change it to use the style as specified
+						editor.execCommand('fontsize', 3);
+
+						var fontElements = editor.wysiwygGetTags('font');
+						for (var i = 0,
+							len = fontElements.length;
+							i < len; ++i) {
+							if (fontElements[i].size === '3') {
+								fontElements[i].removeAttribute('size');
+								fontElements[i].style.fontSize = size + '%';
+							}
+						}
+					}
+
+					e.preventDefault();
+				});
+
+				content.appendChild(link);
+			});
+
+			editor.createDropDown(caller, 'fontsize-picker', content);
+		};
+	};
+})(sceditor);

tests/manual/debug/index.html

@@ -20,6 +20,7 @@
 		<script src="../../../src/plugins/undo.js"></script>
 		<script src="../../../src/plugins/autoyoutube.js"></script>
 		<script src="../../../src/plugins/format.js"></script>
+		<script src="../../../src/plugins/percentage-fontsize.js"></script>
 		<script src="../../../src/plugins/plaintext.js"></script>
 		<script src="../../../src/plugins/autosave.js"></script>
 		<script src="../../../src/plugins/dragdrop.js"></script>