window.cpp Example File

  /****************************************************************************
  **
  ** 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."
  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/

  #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);
  }