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# window.cpp Example File

script/context2d/window.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2015 The Qt Company Ltd.
     ** Contact: http://www.qt.io/licensing/
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** You may use this file under the terms of the BSD license as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of The Qt Company Ltd nor the names of its
     **     contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
     **
     **
     ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
     **
     ** $QT_END_LICENSE$
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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);
     }