QAbstractSpinBox Class

      QSpinBox *zoomSpinBox = new QSpinBox;
      zoomSpinBox->setRange(0, 1000);
      zoomSpinBox->setSingleStep(10);
      zoomSpinBox->setSuffix("%");
      zoomSpinBox->setSpecialValueText(tr("Automatic"));
      zoomSpinBox->setValue(100);

  QSpinBox *spinBox = new QSpinBox(this);
  spinBox->setRange(0, 100);
  spinBox->setWrapping(true);
  spinBox->setValue(100);
  spinBox->stepBy(1);
  // value is 0

成员函数

QAbstractSpinBox::QAbstractSpinBox(QWidget *parent = Q_NULLPTR)

Constructs an abstract spinbox with the given parent with default wrapping, and alignment properties.

QAbstractSpinBox::~QAbstractSpinBox()

Called when the QAbstractSpinBox is destroyed.

[override virtual protected] void QAbstractSpinBox::changeEvent(QEvent *event)

重新实现 QWidget::changeEvent().

[virtual slot] void QAbstractSpinBox::clear()

Clears the lineedit of all text but prefix and suffix.

[override virtual protected] void QAbstractSpinBox::closeEvent(QCloseEvent *event)

重新实现 QWidget::closeEvent().

[override virtual protected] void QAbstractSpinBox::contextMenuEvent(QContextMenuEvent *event)

重新实现 QWidget::contextMenuEvent().

[signal] void QAbstractSpinBox::editingFinished()

This signal is emitted editing is finished. This happens when the spinbox loses focus and when enter is pressed.

[override virtual] bool QAbstractSpinBox::event(QEvent *event)

重新实现 QObject::event().

[virtual] void QAbstractSpinBox::fixup(QString &input) const

This virtual function is called by the QAbstractSpinBox if the 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.

[override virtual protected] void QAbstractSpinBox::focusInEvent(QFocusEvent *event)

重新实现 QWidget::focusInEvent().

[override virtual protected] void QAbstractSpinBox::focusOutEvent(QFocusEvent *event)

重新实现 QWidget::focusOutEvent().

[override virtual protected] void QAbstractSpinBox::hideEvent(QHideEvent *event)

重新实现 QWidget::hideEvent().

[protected] void QAbstractSpinBox::initStyleOption(QStyleOptionSpinBox *option) const

Initialize option with the values from this QSpinBox. This method is useful for subclasses when they need a QStyleOptionSpinBox, but don't want to fill in all the information themselves.

参见 QStyleOption::initFrom().

[override virtual] QVariant QAbstractSpinBox::inputMethodQuery(Qt::InputMethodQuery query) const

重新实现 QWidget::inputMethodQuery().

void QAbstractSpinBox::interpretText()

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

[override virtual protected] void QAbstractSpinBox::keyPressEvent(QKeyEvent *event)

重新实现 QWidget::keyPressEvent().

This function handles keyboard input.

The following keys are handled specifically:

[override virtual protected] void QAbstractSpinBox::keyReleaseEvent(QKeyEvent *event)

重新实现 QWidget::keyReleaseEvent().

[protected] QLineEdit *QAbstractSpinBox::lineEdit() const

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

参见 setLineEdit().

[override virtual] QSize QAbstractSpinBox::minimumSizeHint() const

重新实现 QWidget::minimumSizeHint().

[override virtual protected] void QAbstractSpinBox::mouseMoveEvent(QMouseEvent *event)

重新实现 QWidget::mouseMoveEvent().

[override virtual protected] void QAbstractSpinBox::mousePressEvent(QMouseEvent *event)

重新实现 QWidget::mousePressEvent().

[override virtual protected] void QAbstractSpinBox::mouseReleaseEvent(QMouseEvent *event)

重新实现 QWidget::mouseReleaseEvent().

[override virtual protected] void QAbstractSpinBox::paintEvent(QPaintEvent *event)

重新实现 QWidget::paintEvent().

[override virtual protected] void QAbstractSpinBox::resizeEvent(QResizeEvent *event)

重新实现 QWidget::resizeEvent().

[slot] void QAbstractSpinBox::selectAll()

Selects all the text in the spinbox except the prefix and suffix.

[protected] void QAbstractSpinBox::setLineEdit(QLineEdit *lineEdit)

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

QAbstractSpinBox takes ownership of the new lineEdit

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

参见 lineEdit().

[override virtual protected] void QAbstractSpinBox::showEvent(QShowEvent *event)

重新实现 QWidget::showEvent().

[override virtual] QSize QAbstractSpinBox::sizeHint() const

重新实现 QWidget::sizeHint().

[virtual] void QAbstractSpinBox::stepBy(int steps)

Virtual function that is called whenever the user triggers a step. The 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.

[slot] void QAbstractSpinBox::stepDown()

Steps down by one linestep Calling this slot is analogous to calling stepBy(-1);

参见 stepBy() and stepUp().

[virtual protected] StepEnabled QAbstractSpinBox::stepEnabled() const

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.

参见 QSpinBox::minimum(), QSpinBox::maximum(), and wrapping().

[slot] void QAbstractSpinBox::stepUp()

Steps up by one linestep Calling this slot is analogous to calling stepBy(1);

参见 stepBy() and stepDown().

[override virtual protected] void QAbstractSpinBox::timerEvent(QTimerEvent *event)

重新实现 QObject::timerEvent().

[virtual] QValidator::State QAbstractSpinBox::validate(QString &input, int &pos) const

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

[override virtual protected] void QAbstractSpinBox::wheelEvent(QWheelEvent *event)

重新实现 QWidget::wheelEvent().