window.cpp Example File | Qt Script

Qt 5.9 | Qt Script | Context2D Example | window.cpp Example File

Qt 5.9.4 Reference Documentation

# 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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      #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);
      }