qcontext2dcanvas.cpp Example File | Qt Script

Qt 5.6 | Qt Script | Context2D Example | qcontext2dcanvas.cpp Example File

Qt 5.6.2 Reference Documentation

# qcontext2dcanvas.cpp Example File

script/context2d/qcontext2dcanvas.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.
      **
      ** $QT_BEGIN_LICENSE:BSD$
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      **
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      #include "qcontext2dcanvas.h"

      #include "context2d.h"
      #include "environment.h"
      #include "domimage.h"

      #include <QPainter>
      #include <QPaintEvent>

      QContext2DCanvas::QContext2DCanvas(Context2D *context, Environment *env, QWidget *parent)
          : QWidget(parent), m_context(context), m_env(env)
      {
          QObject::connect(context, SIGNAL(changed(QImage)), this, SLOT(contentsChanged(QImage)));
          setMouseTracking(true);
      }

      QContext2DCanvas::~QContext2DCanvas()
      {
      }

      Context2D *QContext2DCanvas::context() const
      {
          return m_context;
      }

      QScriptValue QContext2DCanvas::getContext(const QString &str)
      {
          if (str != "2d")
              return QScriptValue();
          return m_env->toWrapper(m_context);
      }

      void QContext2DCanvas::contentsChanged(const QImage &image)
      {
          m_image = image;
          update();
      }

      void QContext2DCanvas::paintEvent(QPaintEvent *e)
      {
          QPainter p(this);
      #ifdef Q_OS_SYMBIAN
          // Draw white rect first since in with some themes the js-file content will produce black-on-black.
          QBrush whiteBgBrush(Qt::white);
          p.fillRect(e->rect(), whiteBgBrush);
      #endif
          p.setClipRect(e->rect());
          p.drawImage(0, 0, m_image);
      }

      void QContext2DCanvas::mouseMoveEvent(QMouseEvent *e)
      {
          m_env->handleEvent(this, e);
      }

      void QContext2DCanvas::mousePressEvent(QMouseEvent *e)
      {
          m_env->handleEvent(this, e);
      }

      void QContext2DCanvas::mouseReleaseEvent(QMouseEvent *e)
      {
          m_env->handleEvent(this, e);
      }

      void QContext2DCanvas::keyPressEvent(QKeyEvent *e)
      {
          m_env->handleEvent(this, e);
      }

      void QContext2DCanvas::keyReleaseEvent(QKeyEvent *e)
      {
          m_env->handleEvent(this, e);
      }

      void QContext2DCanvas::resizeEvent(QResizeEvent *e)
      {
          m_context->setSize(e->size().width(), e->size().height());
      }

      void QContext2DCanvas::resize(int width, int height)
      {
          QWidget::resize(width, height);
      }

      void QContext2DCanvas::reset()
      {
          m_context->reset();
      }

      void QContext2DCanvas::addEventListener(const QString &type, const QScriptValue &listener,
                                              bool useCapture)
      {
          Q_UNUSED(useCapture);
          if (listener.isFunction()) {
              QScriptValue self = m_env->toWrapper(this);
              self.setProperty("on" + type, listener);
          }
      }