qcontext2dcanvas.cpp Example File | Qt Script

- Qt 5.5
- Qt Script
- Context2D Example
- qcontext2dcanvas.cpp Example File
- Qt 5.5.1 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.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** 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:
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    **     contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
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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);
        }
    }