qabstractspinbox.cpp

奇趣公司比较新的qt/emd版本

/*!
    Virtual function that determines whether stepping up and down is
    legal at any given time.

    The up arrow will be painted as disabled unless (stepEnabled() &
    StepUpEnabled) != 0.

    The default implementation will return (StepUpEnabled|
    StepDownEnabled) if wrapping is turned on. Else it will return
    StepDownEnabled if value is > minimum() or'ed with StepUpEnabled if
    value < maximum().

    If you subclass QAbstractSpinBox you will need to reimplement this function.

    \sa QSpinBox::minimum(), QSpinBox::maximum(), wrapping()
*/


QAbstractSpinBox::StepEnabled QAbstractSpinBox::stepEnabled() const
{
    Q_D(const QAbstractSpinBox);
    if (d->readOnly || d->type == QVariant::Invalid)
        return StepNone;
    if (d->wrapping)
        return StepEnabled(StepUpEnabled | StepDownEnabled);
    StepEnabled ret = StepNone;
    if (d->variantCompare(d->value, d->maximum) < 0) {
        ret |= StepUpEnabled;
    }
    if (d->variantCompare(d->value, d->minimum) > 0) {
        ret |= StepDownEnabled;
    }
    return ret;
}

/*!
   This virtual function is called by the QAbstractSpinBox to
   determine whether \a input is valid. The \a pos parameter indicates
   the position in the string. Reimplemented in the various
   subclasses.
*/

QValidator::State QAbstractSpinBox::validate(QString & /* input */, int & /* pos */) const
{
    return QValidator::Acceptable;
}

/*!
   This virtual function is called by the QAbstractSpinBox if the
   \a input is not validated to QValidator::Acceptable when Return is
   pressed or interpretText() is called. It will try to change the
   text so it is valid. Reimplemented in the various subclasses.
*/

void QAbstractSpinBox::fixup(QString & /* input */) const
{
}

/*!
  Steps up by one linestep
  Calling this slot is analogous to calling stepBy(1);
  \sa stepBy(), stepDown()
*/

void QAbstractSpinBox::stepUp()
{
    stepBy(1);
}

/*!
  Steps down by one linestep
  Calling this slot is analogous to calling stepBy(-1);
  \sa stepBy(), stepUp()
*/

void QAbstractSpinBox::stepDown()
{
    stepBy(-1);
}
/*!
    Virtual function that is called whenever the user triggers a step.
    The \a steps parameter indicates how many steps were taken, e.g.
    Pressing Qt::Key_Down will trigger a call to stepBy(-1),
    whereas pressing Qt::Key_Prior will trigger a call to
    stepBy(10).

    If you subclass QAbstractSpinBox you must reimplement this
    function. Note that this function is called even if the resulting
    value will be outside the bounds of minimum and maximum. It's this
    function's job to handle these situations.
*/

void QAbstractSpinBox::stepBy(int steps)
{
    Q_D(QAbstractSpinBox);

    const QVariant old = d->value;
    QString tmp = d->edit->displayText();
    int cursorPos = d->edit->cursorPosition();
    bool dontstep = false;
    EmitPolicy e = EmitIfChanged;
    if (d->pendingEmit) {
        dontstep = validate(tmp, cursorPos) != QValidator::Acceptable;
        d->interpret(NeverEmit);
        if (d->value != old)
            e = AlwaysEmit;
    }
    if (!dontstep) {
        d->setValue(d->bound(d->value + (d->singleStep * steps), old, steps), e);
    } else if (e == AlwaysEmit) {
        d->emitSignals(e, old);
    }
    selectAll();
}

/*!
    This function returns a pointer to the line edit of the spin box.
*/

QLineEdit *QAbstractSpinBox::lineEdit() const
{
    Q_D(const QAbstractSpinBox);

    return d->edit;
}


/*!
    \fn void QAbstractSpinBox::setLineEdit(QLineEdit *lineEdit)

    Sets the line edit of the spinbox to be \a lineEdit instead of the
    current line edit widget. \a lineEdit can not be 0.

    QAbstractSpinBox takes ownership of the new lineEdit

    If QLineEdit::validator() for the \a lineEdit returns 0, the internal
    validator of the spinbox will be set on the line edit.
*/

void QAbstractSpinBox::setLineEdit(QLineEdit *lineEdit)
{
    Q_D(QAbstractSpinBox);

    if (!lineEdit) {
        Q_ASSERT(lineEdit);
        return;
    }
    delete d->edit;
    d->edit = lineEdit;
    if (!d->edit->validator())
        d->edit->setValidator(d->validator);

    if (d->edit->parent() != this)
        d->edit->setParent(this);

    d->edit->setFrame(false);
    d->edit->setAttribute(Qt::WA_InputMethodEnabled, false);
    d->edit->setFocusProxy(this);
    d->edit->setAcceptDrops(false);

    if (d->type != QVariant::Invalid) {
        connect(d->edit, SIGNAL(textChanged(QString)),
                this, SLOT(_q_editorTextChanged(QString)));
        connect(d->edit, SIGNAL(cursorPositionChanged(int,int)),
                this, SLOT(_q_editorCursorPositionChanged(int,int)));
    }
    d->updateEditFieldGeometry();
    d->edit->setContextMenuPolicy(Qt::NoContextMenu);

    if (isVisible())
        d->edit->show();
    if (isVisible())
        d->updateEdit();
}


/*!
    This function interprets the text of the spin box. If the value
    has changed since last interpretation it will emit signals.
*/

void QAbstractSpinBox::interpretText()
{
    Q_D(QAbstractSpinBox);
    d->interpret(EmitIfChanged);
}

/*!
    \reimp
*/

bool QAbstractSpinBox::event(QEvent *event)
{
    Q_D(QAbstractSpinBox);
    switch (event->type()) {
    case QEvent::ApplicationLayoutDirectionChange:
    case QEvent::LayoutDirectionChange:
        d->updateEditFieldGeometry();
        break;
    case QEvent::HoverEnter:
    case QEvent::HoverLeave:
    case QEvent::HoverMove:
        if (const QHoverEvent *he = static_cast<const QHoverEvent *>(event))
            d->updateHoverControl(he->pos());
        break;
    case QEvent::ShortcutOverride:
        if (d->edit->event(event))
            return true;
        break;
#ifdef QT_KEYPAD_NAVIGATION
    case QEvent::EnterEditFocus:
    case QEvent::LeaveEditFocus:
        if (QApplication::keypadNavigationEnabled()) {
            const bool b = d->edit->event(event);
            d->edit->setSelection(d->edit->displayText().size() - d->suffix.size(),0);
            if (b)
                return true;
        }
        break;
#endif
    default:
        break;
    }
    return QWidget::event(event);
}

/*!
    \reimp
*/

void QAbstractSpinBox::showEvent(QShowEvent *)
{
    Q_D(QAbstractSpinBox);

    d->reset();
    d->updateEdit();
}

/*!
    \reimp
*/

void QAbstractSpinBox::changeEvent(QEvent *event)
{
    Q_D(QAbstractSpinBox);

    switch (event->type()) {
        case QEvent::StyleChange:
            d->spinClickTimerInterval = style()->styleHint(QStyle::SH_SpinBox_ClickAutoRepeatRate, 0, this);
            d->spinClickThresholdTimerInterval = thresholdTime;
            d->reset();
            d->updateEditFieldGeometry();
            break;
        case QEvent::EnabledChange:
            if (!isEnabled()) {
                d->reset();
            }
            break;
        case QEvent::ActivationChange:
            if (!isActiveWindow()){
                d->reset();
                if (d->pendingEmit) // pendingEmit can be true even if it hasn't changed.
                    d->interpret(EmitIfChanged); // E.g. 10 to 10.0
            }
            break;
        default:
            break;
    }
    QWidget::changeEvent(event);
}

/*!
    \reimp
*/

void QAbstractSpinBox::resizeEvent(QResizeEvent *event)
{
    Q_D(QAbstractSpinBox);
    QWidget::resizeEvent(event);

    d->updateEditFieldGeometry();
    update();
}

/*!
    \reimp
*/

QSize QAbstractSpinBox::sizeHint() const
{
    Q_D(const QAbstractSpinBox);
    ensurePolished();

    const QFontMetrics fm(fontMetrics());
    int h = d->edit->sizeHint().height();
    int w = 0;
    QString s;
    s = d->prefix + d->textFromValue(d->minimum) + d->suffix + QLatin1Char(' ');
    s.truncate(18);
    w = qMax(w, fm.width(s));
    s = d->prefix + d->textFromValue(d->maximum) + d->suffix + QLatin1Char(' ');
    s.truncate(18);
    w = qMax(w, fm.width(s));
    if (d->specialValueText.size()) {
        s = d->specialValueText;
        w = qMax(w, fm.width(s));
    }
    w += 2; // cursor blinking space

    QStyleOptionSpinBox opt;
    initStyleOption(&opt);
    QSize hint(w, h);
    QSize extra(35, 6);
    opt.rect.setSize(hint + extra);
    extra += hint - style()->subControlRect(QStyle::CC_SpinBox, &opt,
                                            QStyle::SC_SpinBoxEditField, this).size();
    // get closer to final result by repeating the calculation
    opt.rect.setSize(hint + extra);
    extra += hint - style()->subControlRect(QStyle::CC_SpinBox, &opt,
                                               QStyle::SC_SpinBoxEditField, this).size();
    hint += extra;

    opt.rect = rect();
    return style()->sizeFromContents(QStyle::CT_SpinBox, &opt, hint, this)
        .expandedTo(QApplication::globalStrut());
}

/*!
    \reimp
*/

QSize QAbstractSpinBox::minimumSizeHint() const
{
    Q_D(const QAbstractSpinBox);
    ensurePolished();

    const QFontMetrics fm(fontMetrics());
    int h = d->edit->minimumSizeHint().height();
    int w = fm.width(QLatin1String("1000"));
    w += 2; // cursor blinking space

    QStyleOptionSpinBox opt;
    initStyleOption(&opt);
    QSize hint(w, h);
    QSize extra(35, 6);
    opt.rect.setSize(hint + extra);
    extra += hint - style()->subControlRect(QStyle::CC_SpinBox, &opt,
                                            QStyle::SC_SpinBoxEditField, this).size();
    // get closer to final result by repeating the calculation
    opt.rect.setSize(hint + extra);
    extra += hint - style()->subControlRect(QStyle::CC_SpinBox, &opt,
                                               QStyle::SC_SpinBoxEditField, this).size();
    hint += extra;

    opt.rect = rect();

    return style()->sizeFromContents(QStyle::CT_SpinBox, &opt, hint, this)
        .expandedTo(QApplication::globalStrut());
}

/*!
    \reimp
*/

void QAbstractSpinBox::paintEvent(QPaintEvent *)
{
    QStyleOptionSpinBox opt;
    initStyleOption(&opt);
    QStylePainter p(this);
    p.drawComplexControl(QStyle::CC_SpinBox, opt);
}

/*!
    \reimp

    This function handles keyboard input.

    The following keys are handled specifically:
    \table
    \row \i Enter/Return
         \i This will reinterpret the text and emit a signal even if the value has not changed
         since last time a signal was emitted.
    \row \i Up
         \i This will invoke stepBy(1)
    \row \i Down
         \i This will invoke stepBy(-1)
    \row \i Page up
         \i This will invoke stepBy(10)
    \row \i Page down
         \i This will invoke stepBy(-10)
    \endtable
*/


void QAbstractSpinBox::keyPressEvent(QKeyEvent *event)
{
    Q_D(QAbstractSpinBox);

    if (!event->text().isEmpty() && d->edit->cursorPosition() < d->prefix.size())
        d->edit->setCursorPosition(d->prefix.size());

    int steps = 1;
    switch (event->key()) {
    case Qt::Key_PageUp:
    case Qt::Key_PageDown:
        steps *= 10;
    case Qt::Key_Up:
    case Qt::Key_Down: {
#ifdef QT_KEYPAD_NAVIGATION
        if (QApplication::keypadNavigationEnabled()) {
            // Reserve up/down for nav - use left/right for edit.
            if (!hasEditFocus() && (event->key() == Qt::Key_Up
                                    || event->key() == Qt::Key_Down)) {
                event->ignore();
                return;
            }
        }
#endif
        event->accept();
        const bool up = (event->key() == Qt::Key_PageUp || event->key() == Qt::Key_Up);
        if (!(stepEnabled() & (up ? StepUpEnabled : StepDownEnabled)))
            return;
        if (!up)
            steps *= -1;
        if (style()->styleHint(QStyle::SH_SpinBox_AnimateButton, 0, this)) {
            d->buttonState = (Keyboard | (up ? Up : Down));
        }
        stepBy(steps);
        return;
    }
#ifdef QT_KEYPAD_NAVIGATION
    case Qt::Key_Left:
    case Qt::Key_Right:
        if (QApplication::keypadNavigationEnabled() && !hasEditFocus()) {
            event->ignore();
            return;
        }
        break;
    case Qt::Key_Back:
        if (QApplication::keypadNavigationEnabled() && !hasEditFocus()) {
            event->ignore();
            return;
        }
        break;
#endif
    case Qt::Key_Enter:
    case Qt::Key_Return:
        d->interpret(d->keyboardTracking ? AlwaysEmit : EmitIfChanged);
        selectAll();
        event->ignore();
        emit editingFinished();
        return;

#ifdef QT_KEYPAD_NAVIGATION
    case Qt::Key_Select:
        if (QApplication::keypadNavigationEnabled()) {
            // Toggles between left/right moving cursor and inc/dec.
            setEditFocus(!hasEditFocus());
        }
        return;
#endif

#ifdef Q_WS_X11 // only X11
    case Qt::Key_U:
        if (event->modifiers() & Qt::ControlModifier) {
            event->accept();
            if (!isReadOnly())
                clear();
            return;
        }
        break;
#endif

    case Qt::Key_End:
    case Qt::Key_Home:
        if (event->modifiers() & Qt::ShiftModifier) {
            int currentPos = d->edit->cursorPosition();
            const QString text = d->edit->displayText();
            if (event->key() == Qt::Key_End) {
                if ((currentPos == 0 && !d->prefix.isEmpty()) || text.size() - d->suffix.size() <= currentPos) {
                    break; // let lineedit handle this
                } else {
                    d->edit->setSelection(currentPos, text.size() - d->suffix.size() - currentPos);
                }
            } else {
                if ((currentPos == text.size() && !d->suffix.isEmpty()) || currentPos <= d->prefix.size()) {
                    break; // let lineedit handle this
                } else {
                    d->edit->setSelection(currentPos, d->prefix.size() - currentPos);
                }
            }
            event->accept();
            return;
        }
        break;

    default:
#ifndef QT_NO_SHORTCUT
        if (event == QKeySequence::SelectAll) {
            selectAll();
            event->accept();
            return;
        }
#endif
        break;