内容

• 公共类型
• 特性
• 公共函数
• 重实现公共函数
• 信号
• 静态公共成员
• 重实现保护函数
• 详细描述

QFontDialog 类

QFontDialog class provides a dialog widget for selecting a font. 更多...

头：	#include <QFontDialog>
qmake:	QT += widgets
继承：	QDialog

• 所有成员列表，包括继承成员

公共类型

enum	FontDialogOption { NoButtons, DontUseNativeDialog, ScalableFonts, NonScalableFonts, MonospacedFonts, ProportionalFonts }
flags	FontDialogOptions

特性

• currentFont : QFont
• options : FontDialogOptions

• 2 特性继承自 QDialog
• 59 特性继承自 QWidget
• 1 特性继承自 QObject

公共函数

	QFontDialog (QWidget * parent = Q_NULLPTR)
	QFontDialog (const QFont & initial , QWidget * parent = Q_NULLPTR)
QFont	currentFont () const
void	open (QObject * receiver , const char * member )
FontDialogOptions	options () const
QFont	selectedFont () const
void	setCurrentFont (const QFont & font )
void	setOption (FontDialogOption option , bool on = true)
void	setOptions (FontDialogOptions options )
bool	testOption (FontDialogOption option ) const

重实现公共函数

virtual void

setVisible (bool visible )

• 8 公共函数继承自 QDialog
• 214 公共函数继承自 QWidget
• 32 公共函数继承自 QObject
• 14 公共函数继承自 QPaintDevice

信号

void	currentFontChanged (const QFont & font )
void	fontSelected (const QFont & font )

• 3 信号继承自 QDialog
• 3 信号继承自 QWidget
• 2 信号继承自 QObject

静态公共成员

QFont	getFont (bool * ok , const QFont & initial , QWidget * parent = Q_NULLPTR, const QString & title = QString(), FontDialogOptions options = FontDialogOptions())
QFont	getFont (bool * ok , QWidget * parent = Q_NULLPTR)

• 5 静态公共成员继承自 QWidget
• 11 静态公共成员继承自 QObject

重实现保护函数

virtual void	changeEvent (QEvent * e )
virtual void	done (int result )

• 6 保护函数继承自 QDialog
• 35 保护函数继承自 QWidget
• 9 保护函数继承自 QObject
• 1 保护函数继承自 QPaintDevice

额外继承成员

• 5 公共槽继承自 QDialog
• 19 公共槽继承自 QWidget
• 1 公共槽继承自 QObject
• 6 保护函数继承自 QDialog
• 35 保护函数继承自 QWidget
• 9 保护函数继承自 QObject
• 1 保护函数继承自 QPaintDevice
• 1 保护槽继承自 QWidget

详细描述

QFontDialog class provides a dialog widget for selecting a font.

字体对话框的创建是透过某一静态 getFont () 函数。

范例：

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
}
					

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

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

If the user clicks OK the font they chose will be used for myWidget, and if they click Cancel the original font is used.

另请参阅 QFont , QFontInfo , QFontMetrics , QColorDialog , QFileDialog ，和 标准对话框范例 .

成员类型文档编制

enum QFontDialog:: FontDialogOption
flags QFontDialog:: FontDialogOptions

This enum specifies various options that affect the look and feel of a font dialog.

For instance, it allows to specify which type of font should be displayed. If none are specified all fonts available will be listed.

Note that the font filtering options might not be supported on some platforms (e.g. Mac). They are always supported by the non native dialog (used on Windows or Linux).

常量	值	描述
QFontDialog::NoButtons	0x00000001	不显示 OK and Cancel buttons. (Useful for "live dialogs".)
QFontDialog::DontUseNativeDialog	0x00000002	Use Qt's standard font dialog on the Mac instead of Apple's native font panel.
QFontDialog::ScalableFonts	0x00000004	Show scalable fonts
QFontDialog::NonScalableFonts	0x00000008	Show non scalable fonts
QFontDialog::MonospacedFonts	0x00000010	Show monospaced fonts
QFontDialog::ProportionalFonts	0x00000020	Show proportional fonts

该枚举在 Qt 4.5 引入或被修改。

FontDialogOptions 类型是 typedef 对于 QFlags <FontDialogOption>. It stores an OR combination of FontDialogOption values.

另请参阅 options , setOption ()，和 testOption ().

特性文档编制

currentFont : QFont

此特性保持对话框的当前字体。

该特性在 Qt 4.5 引入。

访问函数：

QFont	currentFont () const
void	setCurrentFont (const QFont & font )

通知程序信号：

void	currentFontChanged (const QFont & font )

options : FontDialogOptions

This property holds the various options that affect the look and feel of the dialog

默认情况下，所有选项是被禁用的。

Options should be set before showing the dialog. Setting them while the dialog is visible is not guaranteed to have an immediate effect on the dialog (depending on the option and on the platform).

该特性在 Qt 4.5 引入。

访问函数：

FontDialogOptions	options () const
void	setOptions (FontDialogOptions options )

另请参阅 setOption () 和 testOption ().

成员函数文档编制

QFontDialog:: QFontDialog ( QWidget * parent = Q_NULLPTR)

Constructs a standard font dialog.

使用 setCurrentFont () to set the initial font attributes.

parent parameter is passed to the QDialog 构造函数。

该函数在 Qt 4.5 引入。

另请参阅 getFont ().

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

Constructs a standard font dialog with the given parent 和指定 initial 颜色。

该函数在 Qt 4.5 引入。

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

重实现自 QWidget::changeEvent ().

QFont QFontDialog:: currentFont () const

Returns the current font.

该函数在 Qt 4.5 引入。

注意： Getter 函数对于特性 currentFont .

另请参阅 setCurrentFont () 和 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.

该函数在 Qt 4.5 引入。

注意： 通知程序信号对于特性 currentFont .

另请参阅 currentFont , fontSelected ()，和 selectedFont ().

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

重实现自 QDialog::done ().

关闭对话框并将其结果代码设为 result . If this dialog is shown with exec (), done() causes the local event loop to finish, and exec () to return result .

另请参阅 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.

该函数在 Qt 4.5 引入。

另请参阅 selectedFont (), currentFontChanged ()，和 currentFont .

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

执行模态字体对话框并返回字体。

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

范例：

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.

警告： 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 构造函数。

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

这是重载函数。

执行模态字体对话框并返回字体。

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 。若 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 .

范例：

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()
}
					

警告： 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 构造函数。

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

这是重载函数。

打开对话框并连接其 fontSelected () 信号到槽，指定通过 receiver and member .

信号将断开槽连接，当对话框被关闭时。

该函数在 Qt 4.5 引入。

QFont QFontDialog:: selectedFont () const

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

注意： 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 到给定 font .

该函数在 Qt 4.5 引入。

注意： Setter 函数对于特性 currentFont .

另请参阅 currentFont () 和 selectedFont ().

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

设置给定 option 为被启用若 on 为 true；否则，清零给定 option .

另请参阅 options and testOption ().

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

重实现自 QWidget::setVisible ().

bool QFontDialog:: testOption ( FontDialogOption option ) const

返回 true 若给定 option 被启用；否则，返回 false。

另请参阅 options and setOption ().