From f049e0b49be9b783051a7dc05e4ef88da8cfe406 Mon Sep 17 00:00:00 2001
From: Derk-Jan Hartman <hartman.wiki@gmail.com>
Date: Mon, 28 Jul 2014 22:28:29 +0200
Subject: [PATCH] jquery.textSelection: Add ability to register custom
 implementation

At times we replace the textarea with a different implementation, for
instance in the former iframe code of WikiEditor and now in CodeEditor.

Obviously only one implementation of this API can be in control at a
time, but in order to disable/enable which one exactly is currently
determined by the existence of function in the core WikiEditor
context. This is a remnant of when this code was still in WikiEditor.

I added two commands, "register" and "unregister", that take an object
that has alternative function implementations for one or more commands.

Bug: 29328
Change-Id: I14492572f7eb9bbd1af68872dbfef5159126f107
---
 resources/src/jquery/jquery.textSelection.js | 24 ++++++++++++++++----
 1 file changed, 19 insertions(+), 5 deletions(-)

diff --git a/resources/src/jquery/jquery.textSelection.js b/resources/src/jquery/jquery.textSelection.js
index 8d440fdcee..632769ba54 100644
--- a/resources/src/jquery/jquery.textSelection.js
+++ b/resources/src/jquery/jquery.textSelection.js
@@ -24,8 +24,9 @@
 
 	$.fn.textSelection = function ( command, options ) {
 		var fn,
+			alternateFn,
 			context,
-			hasWikiEditorSurface, // The alt edit surface needs to implement the WikiEditor API
+			hasWikiEditor,
 			needSave,
 			retval;
 
@@ -507,6 +508,8 @@
 			}
 		};
 
+		alternateFn = $( this ).data( 'jquery.textSelection' );
+
 		// Apply defaults
 		switch ( command ) {
 			//case 'getContents': // no params
@@ -550,19 +553,30 @@
 					force: false // Force a scroll even if the caret position is already visible
 				}, options );
 				break;
+			case 'register':
+				if ( alternateFn ) {
+					throw new Error( 'Another textSelection API was already registered' );
+				}
+				$( this ).data( 'jquery.textSelection', options );
+				// No need to update alternateFn as this command only stores the options.
+				// A command that uses it will set it again.
+				return;
+			case 'unregister':
+				$( this ).removeData( 'jquery.textSelection' );
+				return;
 		}
 
 		context = $( this ).data( 'wikiEditor-context' );
-		hasWikiEditorSurface = ( context !== undefined && context.$iframe !== undefined );
+		hasWikiEditor = ( context !== undefined && context.$iframe !== undefined );
 
 		// IE selection restore voodoo
 		needSave = false;
-		if ( hasWikiEditorSurface && context.savedSelection !== null ) {
+		if ( hasWikiEditor && context.savedSelection !== null ) {
 			context.fn.restoreSelection();
 			needSave = true;
 		}
-		retval = ( hasWikiEditorSurface && context.fn[command] !== undefined ? context.fn : fn )[command].call( this, options );
-		if ( hasWikiEditorSurface && needSave ) {
+		retval = ( alternateFn && alternateFn[command] || fn[command] ).call( this, options );
+		if ( hasWikiEditor && needSave ) {
 			context.fn.saveSelection();
 		}
 
-- 
2.20.1