QFontDialog Class

  bool ok;
  QFont font = QFontDialog::getFont(
                  &ok, QFont("Helvetica [Cronyx]", 10), this);
  if (ok) {
      // the user clicked OK and font is set to the font the user selected
  } else {
      // the user canceled the dialog; font is set to the initial
      // value, in this case Helvetica [Cronyx], 10
  }

  myWidget.setFont(QFontDialog::getFont(0, myWidget.font()));

成员函数

QFontDialog::QFontDialog(QWidget *parent = Q_NULLPTR)

Constructs a standard font dialog.

Use setCurrentFont() to set the initial font attributes.

The parent parameter is passed to the QDialog constructor.

This function was introduced in Qt 4.5.

参见 getFont().

QFontDialog::QFontDialog(const QFont &initial, QWidget *parent = Q_NULLPTR)

Constructs a standard font dialog with the given parent and specified initial color.

This function was introduced in Qt 4.5.

[virtual protected] void QFontDialog::changeEvent(QEvent *e)

重新实现 QWidget::changeEvent().

QFont QFontDialog::currentFont() const

Returns the current font.

This function was introduced in Qt 4.5.

Note: Getter function for property currentFont.

参见 setCurrentFont() and selectedFont().

[signal] void QFontDialog::currentFontChanged(const QFont &font)

This signal is emitted when the current font is changed. The new font is specified in font.

The signal is emitted while a user is selecting a font. Ultimately, the chosen font may differ from the font currently selected.

This function was introduced in Qt 4.5.

Note: Notifier signal for property currentFont.

参见 currentFont, fontSelected(), and selectedFont().

[virtual protected] void QFontDialog::done(int result)

重新实现 QDialog::done().

Closes the dialog and sets its result code to result. If this dialog is shown with exec(), done() causes the local event loop to finish, and exec() to return result.

参见 QDialog::done().

[signal] void QFontDialog::fontSelected(const QFont &font)

This signal is emitted when a font has been selected. The selected font is specified in font.

The signal is only emitted when a user has chosen the final font to be used. It is not emitted while the user is changing the current font in the font dialog.

This function was introduced in Qt 4.5.

参见 selectedFont(), currentFontChanged(), and currentFont.

[static] QFont QFontDialog::getFont(bool *ok, const QFont &initial, QWidget *parent = Q_NULLPTR, const QString &title = QString(), FontDialogOptions options = FontDialogOptions())

Executes a modal font dialog and returns a font.

If the user clicks OK, the selected font is returned. If the user clicks Cancel, the initial font is returned.

The dialog is constructed with the given parent and the options specified in options. title is shown as the window title of the dialog and initial is the initially selected font. If the ok parameter is not-null, the value it refers to is set to true if the user clicks OK, and set to false if the user clicks Cancel.

Examples:

  bool ok;
  QFont font = QFontDialog::getFont(&ok, QFont("Times", 12), this);
  if (ok) {
      // font is set to the font the user selected
  } else {
      // the user canceled the dialog; font is set to the initial
      // value, in this case Times, 12.
  }

The dialog can also be used to set a widget's font directly:

  myWidget.setFont(QFontDialog::getFont(0, myWidget.font()));

In this example, if the user clicks OK the font they chose will be used, and if they click Cancel the original font is used.

Warning: Do not delete parent during the execution of the dialog. If you want to do this, you should create the dialog yourself using one of the QFontDialog constructors.

[static] QFont QFontDialog::getFont(bool *ok, QWidget *parent = Q_NULLPTR)

This is an overloaded function.

Executes a modal font dialog and returns a font.

If the user clicks OK, the selected font is returned. If the user clicks Cancel, the Qt default font is returned.

The dialog is constructed with the given parent. If the ok parameter is not-null, the value it refers to is set to true if the user clicks OK, and false if the user clicks Cancel.

Example:

  bool ok;
  QFont font = QFontDialog::getFont(&ok, this);
  if (ok) {
      // font is set to the font the user selected
  } else {
      // the user canceled the dialog; font is set to the default
      // application font, QApplication::font()
  }

Warning: Do not delete parent during the execution of the dialog. If you want to do this, you should create the dialog yourself using one of the QFontDialog constructors.

void QFontDialog::open(QObject *receiver, const char *member)

This is an overloaded function.

Opens the dialog and connects its fontSelected() signal to the slot specified by receiver and member.

The signal will be disconnected from the slot when the dialog is closed.

This function was introduced in Qt 4.5.

QFont QFontDialog::selectedFont() const

Returns the font that the user selected by clicking the OK or equivalent button.

Note: This font is not always the same as the font held by the currentFont property since the user can choose different fonts before finally selecting the one to use.

void QFontDialog::setCurrentFont(const QFont &font)

Sets the font highlighted in the QFontDialog to the given font.

This function was introduced in Qt 4.5.

Note: Setter function for property currentFont.

参见 currentFont() and selectedFont().

void QFontDialog::setOption(FontDialogOption option, bool on = true)

Sets the given option to be enabled if on is true; otherwise, clears the given option.

参见 options and testOption().

[virtual] void QFontDialog::setVisible(bool visible)

重新实现 QWidget::setVisible().

bool QFontDialog::testOption(FontDialogOption option) const

Returns true if the given option is enabled; otherwise, returns false.

参见 options and setOption().