QFontComboBox Class
QFontComboBox 是一个提供用户选择字体的下拉列表框. 更多...
| 头文件: | #include <QFontComboBox> |
| qmake: | QT += widgets |
| 开始支持版本: | Qt 4.2 |
| 基类: | QComboBox |
公有类型
| enum | FontFilter { AllFonts, ScalableFonts, NonScalableFonts, MonospacedFonts, ProportionalFonts } |
| flags | FontFilters |
属性
- currentFont : QFont
- fontFilters : FontFilters
- writingSystem : QFontDatabase::WritingSystem
公有函数
| QFontComboBox(QWidget *parent = Q_NULLPTR) | |
| ~QFontComboBox() | |
| QFont | currentFont() const |
| FontFilters | fontFilters() const |
| void | setFontFilters(FontFilters filters) |
| void | setWritingSystem(QFontDatabase::WritingSystem) |
| QFontDatabase::WritingSystem | writingSystem() const |
重新实现的公有函数
| virtual QSize | sizeHint() const |
- 60 个公有函数继承自 QComboBox
- 214 个公有函数继承自 QWidget
- 32 个公有函数继承自 QObject
- 14 个公有函数继承自 QPaintDevice
公有槽函数
| void | setCurrentFont(const QFont &f) |
信号
| void | currentFontChanged(const QFont &font) |
重新实现的受保护函数
| virtual bool | event(QEvent *e) |
- 15 个受保护的函数继承自 QComboBox
- 35 个受保护的函数继承自 QWidget
- 9 个受保护的函数继承自 QObject
- 1 个受保护的函数继承自 QPaintDevice
其他继承的成员
- 1 个公有变量继承自 QObject
- 5 个静态公有成员继承自 QWidget
- 10 个静态公有成员继承自 QObject
- 15 个受保护的函数继承自 QComboBox
- 35 个受保护的函数继承自 QWidget
- 9 个受保护的函数继承自 QObject
- 1 个受保护的函数继承自 QPaintDevice
- 1 个受保护的槽函数继承自 QWidget
- 2 个受保护的变量继承自 QObject
- 1 protected type inherited from QPaintDevice
详细描述
QFontComboBox 是一个提供用户选择字体的下拉列表框.
下拉列表框以字母表顺序显示字体名称, 如 Arial, Helvetica, Times New Roman. 下拉列表框尽可能以实际字体显示字体族名称. 对于Symbol之类的字体, 如果名称不能展示字形, 则会在名称旁边显示一个字体示例.
QFontComboBox 经常放置在工具栏, 与控制字体大小的 QComboBox 和粗体, 斜体 QToolButton配合使用.
当用户选择一个新字体, QFontComboBox会发出两个信号: currentFontChanged() 和 currentIndexChanged().
调用 setWritingSystem() 设置 QFontComboBox 显示特定字体, 调用 setFontFilters() 过滤某些字体, 例如. 不可缩放字体或等宽字体.
参见 QComboBox, QFont, QFontInfo, QFontMetrics, QFontDatabase, Character Map Example.
成员类型
enum QFontComboBox::FontFilter
flags QFontComboBox::FontFilters
This enum can be used to only show certain types of fonts in the font combo box.
| Constant | Value | Description |
|---|---|---|
QFontComboBox::AllFonts | 0 | Show all fonts |
QFontComboBox::ScalableFonts | 0x1 | Show scalable fonts |
QFontComboBox::NonScalableFonts | 0x2 | Show non scalable fonts |
QFontComboBox::MonospacedFonts | 0x4 | Show monospaced fonts |
QFontComboBox::ProportionalFonts | 0x8 | Show proportional fonts |
The FontFilters type is a typedef for QFlags<FontFilter>. It stores an OR combination of FontFilter values.
属性
currentFont : QFont
This property holds the currently selected font
访问函数:
| QFont | currentFont() const |
| void | setCurrentFont(const QFont &f) |
Notifier signal:
| void | currentFontChanged(const QFont &font) |
参见 currentIndex and currentText.
fontFilters : FontFilters
This property holds the filter for the combobox
By default, all fonts are listed.
访问函数:
| FontFilters | fontFilters() const |
| void | setFontFilters(FontFilters filters) |
参见 writingSystem.
writingSystem : QFontDatabase::WritingSystem
This property holds the writing system that serves as a filter for the combobox
If script is QFontDatabase::Any (the default), all fonts are listed.
访问函数:
| QFontDatabase::WritingSystem | writingSystem() const |
| void | setWritingSystem(QFontDatabase::WritingSystem) |
参见 fontFilters.
成员函数
QFontComboBox::QFontComboBox(QWidget *parent = Q_NULLPTR)
Constructs a font combobox with the given parent.
QFontComboBox::~QFontComboBox()
Destroys the combobox.
[signal] void QFontComboBox::currentFontChanged(const QFont &font)
This signal is emitted whenever the current font changes, with the new font.
Note: Notifier signal for property currentFont.
参见 currentFont.
[virtual protected] bool QFontComboBox::event(QEvent *e)
重新实现 QObject::event().
[virtual] QSize QFontComboBox::sizeHint() const
重新实现 QWidget::sizeHint().