C++ QStyleOptionComboBox::init方法代码示例

void QgsDateTimeEdit::mousePressEvent( QMouseEvent *event )
{
  // catch mouse press on the button (when the current value is null)
  // in non-calendar mode: modifiy the date  so it leads to showing current date (don't bother about time)
  // in calendar mode: be sure NULL is displayed when needed and show page of current date in calendar widget

  bool updateCalendar = false;

  if ( mIsNull )
  {
    QStyle::SubControl control;
    if ( calendarPopup() )
    {
      QStyleOptionComboBox optCombo;
      optCombo.init( this );
      optCombo.editable = true;
      optCombo.subControls = QStyle::SC_All;
      control = style()->hitTestComplexControl( QStyle::CC_ComboBox, &optCombo, event->pos(), this );

      if ( control == QStyle::SC_ComboBoxArrow && calendarWidget() )
      {
        mCurrentPressEvent = true;
        // ensure the line edit still displays NULL
        updateCalendar = true;
        displayNull( updateCalendar );
        mCurrentPressEvent = false;
      }
    }
    else
    {
      QStyleOptionSpinBox opt;
      this->initStyleOption( &opt );
      control  = style()->hitTestComplexControl( QStyle::CC_SpinBox, &opt, event->pos(), this );

      if ( control == QStyle::SC_SpinBoxDown || control == QStyle::SC_SpinBoxUp )
      {
        mCurrentPressEvent = true;
        disconnect( this, &QDateTimeEdit::dateTimeChanged, this, &QgsDateTimeEdit::changed );
        resetBeforeChange( control == QStyle::SC_SpinBoxDown ? -1 : 1 );
        connect( this, &QDateTimeEdit::dateTimeChanged, this, &QgsDateTimeEdit::changed );
        mCurrentPressEvent = false;
      }
    }
  }

  QDateTimeEdit::mousePressEvent( event );

  if ( updateCalendar )
  {
    // set calendar page to current date to avoid going to minimal date page when value is null
    calendarWidget()->setCurrentPage( QDate::currentDate().year(), QDate::currentDate().month() );
  }
}

void KoSliderComboContainer::mousePressEvent(QMouseEvent *e)
{
    QStyleOptionComboBox opt;
    opt.init(m_parent);
    opt.subControls = QStyle::SC_All;
    opt.activeSubControls = QStyle::SC_ComboBoxArrow;
    QStyle::SubControl sc = style()->hitTestComplexControl(QStyle::CC_ComboBox, &opt,
                                                           m_parent->mapFromGlobal(e->globalPos()),
                                                           m_parent);
    if (sc == QStyle::SC_ComboBoxArrow)
        setAttribute(Qt::WA_NoMouseReplay);
    QMenu::mousePressEvent(e);
}

void KoSliderCombo::paintEvent(QPaintEvent *)
{
    QStylePainter gc(this);

    gc.setPen(palette().color(QPalette::Text));

    QStyleOptionComboBox opt;
    opt.init(this);
    opt.subControls = QStyle::SC_All;
    opt.editable = true;
    gc.drawComplexControl(QStyle::CC_ComboBox, opt);
    gc.drawControl(QStyle::CE_ComboBoxLabel, opt);
}

QSize KoSliderCombo::minimumSizeHint() const
{
    QSize sh;

    const QFontMetrics &fm = fontMetrics();

    sh.setWidth(5 * fm.width(QLatin1Char('8')));
    sh.setHeight(qMax(fm.lineSpacing(), 14) + 2);

    // add style and strut values
    QStyleOptionComboBox opt;
    opt.init(this);
    opt.subControls = QStyle::SC_All;
    opt.editable = true;
    sh = style()->sizeFromContents(QStyle::CT_ComboBox, &opt, sh, this);

    return sh.expandedTo(QApplication::globalStrut());
}

KoSliderCombo::KoSliderCombo(QWidget *parent)
   : QComboBox(parent)
    ,d(new KoSliderComboPrivate())
{
    d->thePublic = this;
    d->minimum = 0.0;
    d->maximum = 100.0;
    d->decimals = 2;
    d->container = new KoSliderComboContainer(this);
    d->container->setAttribute(Qt::WA_WindowPropagation);
    QStyleOptionComboBox opt;
    opt.init(this);
//    d->container->setFrameStyle(style()->styleHint(QStyle::SH_ComboBox_PopupFrameStyle, &opt, this));

    d->slider = new QSlider(Qt::Horizontal);
    d->slider->setMinimum(0);
    d->slider->setMaximum(256);
    d->slider->setPageStep(10);
    d->slider->setValue(0);
    // When set to true, causes flicker on Qt 4.6. Any reason to keep it?
    d->firstShowOfSlider = false; //true;

    QHBoxLayout * l = new QHBoxLayout();
    l->setMargin(2);
    l->setSpacing(2);
    l->addWidget(d->slider);
    d->container->setLayout(l);
    d->container->resize(200, 30);

    setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);

    setEditable(true);
    //setEditText(KGlobal::locale()->formatNumber(0, d->decimals));
	setEditText(QString::number(0.0f, 'f', d->decimals));
	
    connect(d->slider, SIGNAL(valueChanged(int)), SLOT(sliderValueChanged(int)));
    connect(d->slider, SIGNAL(sliderReleased()), SLOT(sliderReleased()));
    connect(lineEdit(), SIGNAL(editingFinished()), SLOT(lineEditFinished()));
}

void KoSliderCombo::KoSliderComboPrivate::showPopup()
{
    if(firstShowOfSlider) {
        container->show(); //show container a bit early so the slider can be layout'ed
        firstShowOfSlider = false;
    }

    QStyleOptionSlider opt;
    opt.init(slider);
    opt.maximum=256;
    opt.sliderPosition = opt.sliderValue = slider->value();
    int hdlPos = thePublic->style()->subControlRect(QStyle::CC_Slider, &opt, QStyle::SC_SliderHandle).center().x();

    QStyleOptionComboBox optThis;
    optThis.init(thePublic);
    optThis.subControls = QStyle::SC_All;
    optThis.editable = true;
    int arrowPos = thePublic->style()->subControlRect(QStyle::CC_ComboBox, &optThis, QStyle::SC_ComboBoxArrow).center().x();

    QSize popSize = container->size();
    QRect popupRect(thePublic->mapToGlobal(QPoint(arrowPos - hdlPos - slider->x(), thePublic->size().height())), popSize);

    // Make sure the popup is not drawn outside the screen area
    QRect screenRect = QApplication::desktop()->availableGeometry(thePublic);
    if (popupRect.right() > screenRect.right())
        popupRect.translate(screenRect.right() - popupRect.right(), 0);
    if (popupRect.left() < screenRect.left())
        popupRect.translate(screenRect.left() - popupRect.left(), 0);
    if (popupRect.bottom() > screenRect.bottom())
        popupRect.translate(0, -(thePublic->height() + container->height()));

    container->setGeometry(popupRect);
    container->raise();
    container->show();
    slider->setFocus();
}