/* * Copyright (C) 2002-2004, Richard J. Moore * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public License * along with this library; see the file COPYING.LIB. If not, write to * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, * Boston, MA 02110-1301, USA. */ /** * @mainpage Framework for embedding the KJS Javascript Interpreter * * @section intro Introduction * * The KJSEmbed library provides a framework that makes it easy for * applications to embed KJS, the KDE JavaScript interpreter. The * facilities available include a JS console widget, a dialog loader * and a binding between JS and the properties and slots of TQObjects. * * @section classes Important Classes * * The most important classes to consider are: * * @ref KJSEmbed::KJSEmbedPart : * Main API for KJSEmbed. * * @ref KJSEmbed::JSConsoleWidget : * A widget that provides an interactive JS console. * * @ref KJSEmbed::JSObjectProxy : * A Javascript object that can access the properties of a TTQObject, * * @ref KJSEmbed::SecurityPolicy : * Defines a security policy for @ref JSObjectProxy. * * @section basic Basic Usage * * The simplest way to use KJSEmbed is by simply creating a Javascript * console widget. The console allows the user to enter and run arbitrary * Javascript expressions. * 
 *    KJSEmbed::JSConsoleWidget *win = new KJSEmbed::JSConsoleWidget();
 *    win->show();
 *
* The embedding application can run scripts in the console using the * execute() method. * * The best way to use KJSEmbed is keep control of the interpreter * yourself using the KJSEmbedPart, this way you can make parts of your * application available to scripts. The following example creates its * own interpreter then binds it to the console: * 
 *    KJSEmbed::KJSEmbedPart *js = new KJSEmbed::KJSEmbedPart();
 *    KJSEmbed::JSConsoleWidget *console = js->view();
 *
* * @section proxy Publishing TQObjects * * KJSEmbed allows applications to make arbitrary TQObjects visible to a * Javascript interpreter. The binding itself is provided by the @ref JSProxyObject * class, but is more easily used via the addObject(...) methods of @ref KJSEmbedPart. * * The following code shows how easy it is to make an object available for * scripting. It creates a TTQVBox containing two TQLabels then makes them visible * to KJSEmbed: * 
 *    TTQVBox *toplevel = new TTQVBox( 0, "box" );
 *    TTQLabel *title = new TTQLabel( "Some Title", toplevel, "title");
 *    TTQLabel *main = new TTQLabel( "Some text, more text.", toplevel, "main" );
 *
 *    js->addObject( title );
 *    js->addObject( main, "text" );
 *
* * Publishing an object makes it possibile for scripts to access both the * properties and slots as if it was a normal Javascript object. The code * above allows scripts read-write access to the label properties as this * script illustrates: * 
 *    title.text = "World"
 *    title.text = "Hello " + title.text
 *
* The script above would set the text of the label to 'Hello World'. * * The slots of a TTQObject bound to the interpreter are made available to * scripts as if they normal methods. In the example above, we could conceal * the label 'main' entirely by calling its hide() slot: * 
 *    main.hide()
 *
* * @section tree Access To the TTQObject Tree * * As well as providing script access to an individual widget, KJSEmbed * allows scripts to walk the object tree and access others. If we * modified the previous example to publish the TQBox widget 'toplevel' as * follows: * 
 *    js->addObject( toplevel, "window" );
 *
* Then, despite the fact we've only explicitly published a single widget, * we've also provided access to both 'main' and 'title'. The ability * to navigate the object tree is limited by the SecurityPolicy, the default * policy only allows scripts access to children of the published object. * * To achieve the same result as before, we could use script like this: * 
 *    window.child("main").text = "World"
 *    window.child("main").text = "Hello " + window.child("main").text
 *
* The result of this script is identical to the previous example. * * @section examples Some KJSEmbed examples * @subsection embedjs Example of embedding KJSEmbed into an application. * @image html embedjs.png * This is an example of how to embed and interface with KJSEmbed. This * example covers: * @li embedding the kpart. * @li publishing the interface. * @li calling javascript members. * @li handling javascript objects returned by these members. * @li embedding the KJSEmbed console. * @dontinclude embedviewimp.cpp * To embed the interpreter we can just create a new KJSEmbed part. * @skipline m_part * To publish the objects we can then call @ref KJSEmbed::KJSEmbedPart::addObject on our part. * This will then add any TTQObject based class the the global scope of the * javascript interperter. * @skipline addObject * Once you have your objects published you can then execute javascript code from a file. * @skipline runFile * @dontinclude embedviewimp.cpp * When the script is running javascript methods can be accessed by calling the * @ref KJSEmbed::KJSEmbedPart::callMethod method. * @skipline args * @until callMethod * Any arguments that you wish to pass into the javascript method are contained in the * @ref KJS::List. This is just a list of @ref KJS::Value objects and can be created from * TQVariants or from custom @ref KJS::Object based classes. * Once you have the data back from the method you can convert it easily from the @ref KJS::Value * type to a TTQVariant with the @ref KJSEmbed::convertToVariant method. * @line personalData * @until notes: * Complex arrays or @ref KJS::Objects are transparently converted to TTQVariant::Map types so * they can easily be manipulated from C++. * The KJSEmbed::console is also easy to add to applications. An example of a method that * will toggle the console is below. * @skipline consoleClicked * @until } * * @subsection embedjs Example of Using Qt Designer files in KJSEmbed. * @image html jscalc.png * This is a very simple example that shows off how to use Qt widget files * and connect the objects to javascript functions. * @dontinclude calc.js * To load the Qt Designer user interface file and publish the objects in the XML file * the KJSEmbed Factory class has a UI loader. * @skipline Factory.loadui * Once the file is loaded the user interface object can then be manipulated by javascript. * @line new Calculator * @until application.exec * It is important to note that before the javascript will support connecting signals and slots * the application.exec() method must be called. * * Connecting the user interface to javascript methods is similar C++ in that you create * a method and then use the connect(...) method to connect the signal to the method. * @dontinclude calc.js * @skipline function * @until display * @skipline this.clear * @skipline clear * @skipline } */