qt5base-lts/examples/widgets/painting/shared/arthurwidgets.h

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**
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** This file is part of the demonstration applications of the Qt Toolkit.
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#ifndef ARTHURWIDGETS_H
#define ARTHURWIDGETS_H

#include "arthurstyle.h"
#include <QBitmap>
#include <QPushButton>
#include <QGroupBox>

#if defined(QT_OPENGL_SUPPORT)
#include <QGLWidget>
#include <QEvent>
class GLWidget : public QGLWidget
{
public:
    GLWidget(QWidget *parent)
        : QGLWidget(QGLFormat(QGL::SampleBuffers), parent)
    {
        setAttribute(Qt::WA_AcceptTouchEvents);
    }
    void disableAutoBufferSwap() { setAutoBufferSwap(false); }
    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE { parentWidget()->update(); }
protected:
    bool event(QEvent *event) Q_DECL_OVERRIDE
    {
        switch (event->type()) {
        case QEvent::TouchBegin:
        case QEvent::TouchUpdate:
        case QEvent::TouchEnd:
            event->ignore();
            return false;
            break;
        default:
            break;
        }
        return QGLWidget::event(event);
    }
};
#endif

QT_FORWARD_DECLARE_CLASS(QTextDocument)
QT_FORWARD_DECLARE_CLASS(QTextEdit)
QT_FORWARD_DECLARE_CLASS(QVBoxLayout)

class ArthurFrame : public QWidget
{
    Q_OBJECT
public:
    ArthurFrame(QWidget *parent);
    virtual void paint(QPainter *) {}


    void paintDescription(QPainter *p);

    void loadDescription(const QString &filename);
    void setDescription(const QString &htmlDesc);

    void loadSourceFile(const QString &fileName);

    bool preferImage() const { return m_prefer_image; }

#if defined(QT_OPENGL_SUPPORT)
    QGLWidget *glWidget() const { return glw; }
#endif

public slots:
    void setPreferImage(bool pi) { m_prefer_image = pi; }
    void setDescriptionEnabled(bool enabled);
    void showSource();

#if defined(QT_OPENGL_SUPPORT)
    void enableOpenGL(bool use_opengl);
    bool usesOpenGL() { return m_use_opengl; }
#endif

signals:
    void descriptionEnabledChanged(bool);

protected:
    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE;
    void resizeEvent(QResizeEvent *) Q_DECL_OVERRIDE;

#if defined(QT_OPENGL_SUPPORT)
    GLWidget *glw;
    bool m_use_opengl;
#endif
    QPixmap m_tile;

    bool m_show_doc;
    bool m_prefer_image;
    QTextDocument *m_document;

    QString m_sourceFileName;

};

#endif