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# window.cpp Example File
script/context2d/window.cpp

     /****************************************************************************
     **
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     ** All rights reserved.
     ** Contact: Nokia Corporation (qt-info@nokia.com)
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     ** This file is part of the examples of the Qt Toolkit.
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     ** $QT_BEGIN_LICENSE:LGPL$
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     ** accordance with the Qt Commercial License Agreement provided with the
     ** Software or, alternatively, in accordance with the terms contained in
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     ** Alternatively, this file may be used under the terms of the GNU Lesser
     ** General Public License version 2.1 as published by the Free Software
     ** Foundation and appearing in the file LICENSE.LGPL included in the
     ** packaging of this file.  Please review the following information to
     ** ensure the GNU Lesser General Public License version 2.1 requirements
     ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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     ** GNU General Public License Usage
     ** Alternatively, this file may be used under the terms of the GNU
     ** General Public License version 3.0 as published by the Free Software
     ** Foundation and appearing in the file LICENSE.GPL included in the
     ** packaging of this file.  Please review the following information to
     ** ensure the GNU General Public License version 3.0 requirements will be
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     #include "window.h"
     #include "environment.h"
     #include "context2d.h"
     #include "qcontext2dcanvas.h"
     #include <QHBoxLayout>
     #include <QListWidget>
     #include <QDir>
     #include <QMessageBox>

     #ifndef QT_NO_SCRIPTTOOLS
     #include <QAction>
     #include <QApplication>
     #include <QMainWindow>
     #include <QPushButton>
     #include <QVBoxLayout>
     #include <QScriptEngineDebugger>
     #endif

     static QString scriptsDir()
     {
         if (QFile::exists("./scripts"))
             return "./scripts";
         return ":/scripts";
     }

     Window::Window(QWidget *parent)
         : QWidget(parent)
     #ifndef QT_NO_SCRIPTTOOLS
           , m_debugger(0), m_debugWindow(0)
     #endif
     {
         m_env = new Environment(this);
         QObject::connect(m_env, SIGNAL(scriptError(QScriptValue)),
                          this, SLOT(reportScriptError(QScriptValue)));

         Context2D *context = new Context2D(this);
         context->setSize(150, 150);
         m_canvas = new QContext2DCanvas(context, m_env, this);
         m_canvas->setFixedSize(context->size());
         m_canvas->setObjectName("tutorial");
         m_env->addCanvas(m_canvas);

     #ifndef QT_NO_SCRIPTTOOLS
         QVBoxLayout *vbox = new QVBoxLayout();
         vbox->addWidget(m_canvas);
         m_debugButton = new QPushButton(tr("Run in Debugger"));
         connect(m_debugButton, SIGNAL(clicked()), this, SLOT(runInDebugger()));
         vbox->addWidget(m_debugButton);
     #endif

         QHBoxLayout *hbox = new QHBoxLayout(this);
         m_view = new QListWidget(this);
         m_view->setEditTriggers(QAbstractItemView::NoEditTriggers);
         hbox->addWidget(m_view);
     #ifndef QT_NO_SCRIPTTOOLS
         hbox->addLayout(vbox);
     #else
         hbox->addWidget(m_canvas);
     #endif

         QDir dir(scriptsDir());
         QFileInfoList entries = dir.entryInfoList(QStringList() << "*.js");
         for (int i = 0; i < entries.size(); ++i)
             m_view->addItem(entries.at(i).fileName());
         connect(m_view, SIGNAL(currentItemChanged(QListWidgetItem*,QListWidgetItem*)),
                 this, SLOT(selectScript(QListWidgetItem*)));

         setWindowTitle(tr("Context 2D"));
     }

     void Window::selectScript(QListWidgetItem *item)
     {
         QString fileName = item->text();
         runScript(fileName, /*debug=*/false);
     }

     void Window::reportScriptError(const QScriptValue &error)
     {
         QMessageBox::warning(this, tr("Context 2D"), tr("Line %0: %1")
                              .arg(error.property("lineNumber").toInt32())
                              .arg(error.toString()));
     }

     #ifndef QT_NO_SCRIPTTOOLS
     void Window::runInDebugger()
     {
         QListWidgetItem *item = m_view->currentItem();
         if (item) {
             QString fileName = item->text();
             runScript(fileName, /*debug=*/true);
         }
     }
     #endif

     void Window::runScript(const QString &fileName, bool debug)
     {
         QFile file(scriptsDir() + "/" + fileName);
         file.open(QIODevice::ReadOnly);
         QString contents = file.readAll();
         file.close();
         m_env->reset();

     #ifndef QT_NO_SCRIPTTOOLS
         if (debug) {
             if (!m_debugger) {
                 m_debugger = new QScriptEngineDebugger(this);
                 m_debugWindow = m_debugger->standardWindow();
                 m_debugWindow->setWindowModality(Qt::ApplicationModal);
                 m_debugWindow->resize(1280, 704);
             }
             m_debugger->attachTo(m_env->engine());
             m_debugger->action(QScriptEngineDebugger::InterruptAction)->trigger();
         } else {
             if (m_debugger)
                 m_debugger->detach();
         }
     #else
         Q_UNUSED(debug);
     #endif

         QScriptValue ret = m_env->evaluate(contents, fileName);

     #ifndef QT_NO_SCRIPTTOOLS
         if (m_debugWindow)
             m_debugWindow->hide();
     #endif

         if (ret.isError())
             reportScriptError(ret);
     }