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

 /****************************************************************************
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 ** This file is part of the examples of the Qt Toolkit.
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 ** Alternatively, this file may be used under the terms of the GNU
 ** General Public License version 3.0 as published by the Free Software
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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);
 }