QShortcut class is used to create keyboard shortcuts. 更多...
头: | #include <QShortcut> |
qmake: | QT += widgets |
继承: | QObject |
|
QShortcut (QWidget * parent ) | |
QShortcut (const QKeySequence & key , QWidget * parent , const char * member = Q_NULLPTR, const char * ambiguousMember = Q_NULLPTR, Qt::ShortcutContext context = Qt::WindowShortcut) | |
~QShortcut () | |
bool | autoRepeat () const |
Qt::ShortcutContext | context () const |
int | id () const |
bool | isEnabled () const |
QKeySequence | key () const |
QWidget * | parentWidget () const |
void | setAutoRepeat (bool on ) |
void | setContext (Qt::ShortcutContext context ) |
void | setEnabled (bool enable ) |
void | setKey (const QKeySequence & key ) |
void | setWhatsThis (const QString & text ) |
QString | whatsThis () const |
void | activated () |
void | activatedAmbiguously () |
QShortcut class is used to create keyboard shortcuts.
QShortcut class provides a way of connecting keyboard shortcuts to Qt's 信号和槽 mechanism, so that objects can be informed when a shortcut is executed. The shortcut can be set up to contain all the key presses necessary to describe a keyboard shortcut, including the states of modifier keys such as Shift , Ctrl ,和 Alt .
On certain widgets, using '&' in front of a character will automatically create a mnemonic (a shortcut) for that character, e.g. "E&xit" will create the shortcut Alt+X (use '&&' to display an actual ampersand). The widget might consume and perform an action on a given shortcut. On X11 the ampersand will not be shown and the character will be underlined. On Windows, shortcuts are normally not displayed until the user presses the Alt key, but this is a setting the user can change. On Mac, shortcuts are disabled by default. Call qt_set_sequence_auto_mnemonic () to enable them. However, because mnemonic shortcuts do not fit in with Aqua's guidelines, Qt will not show the shortcut character underlined.
For applications that use menus, it may be more convenient to use the convenience functions provided in the QMenu class to assign keyboard shortcuts to menu items as they are created. Alternatively, shortcuts may be associated with other types of actions in the QAction 类。
The simplest way to create a shortcut for a particular widget is to construct the shortcut with a key sequence. For example:
shortcut = new QShortcut(QKeySequence(tr("Ctrl+O", "File|Open")), parent);
当用户键入 键序列 for a given shortcut, the shortcut's activated () signal is emitted. (In the case of ambiguity, the activatedAmbiguously () signal is emitted.) A shortcut is "listened for" by Qt's event loop when the shortcut's parent widget is receiving events.
A shortcut's key sequence can be set with setKey () and retrieved with key (). A shortcut can be enabled or disabled with setEnabled (), and can have "What's This?" help text set with setWhatsThis ().
另请参阅 QShortcutEvent , QKeySequence ,和 QAction .
此特性保持快捷方式是否可以自动重复
If true, the shortcut will auto repeat when the keyboard shortcut combination is held down, provided that keyboard auto repeat is enabled on the system. The default value is true.
该特性在 Qt 4.2 引入。
访问函数:
bool | autoRepeat () const |
void | setAutoRepeat (bool on ) |
This property holds the context in which the shortcut is valid
A shortcut's context decides in which circumstances a shortcut is allowed to be triggered. The normal context is Qt::WindowShortcut , which allows the shortcut to trigger if the parent (the widget containing the shortcut) is a subwidget of the active top-level window.
默认情况下,此特性被设为 Qt::WindowShortcut .
访问函数:
Qt::ShortcutContext | context () const |
void | setContext (Qt::ShortcutContext context ) |
This property holds whether the shortcut is enabled
An enabled shortcut emits the activated () 或 activatedAmbiguously () signal when a QShortcutEvent occurs that matches the shortcut's key () sequence.
If the application is in
WhatsThis
mode the shortcut will not emit the signals, but will show the "What's This?" text instead.
默认情况下此特性为
true
.
访问函数:
bool | isEnabled () const |
void | setEnabled (bool enable ) |
另请参阅 whatsThis .
This property holds the shortcut's key sequence
This is a key sequence with an optional combination of Shift, Ctrl, and Alt. The key sequence may be supplied in a number of ways:
setKey(0); // no signal emitted setKey(QKeySequence()); // no signal emitted setKey(0x3b1); // Greek letter alpha setKey(Qt::Key_D); // 'd', e.g. to delete setKey('q'); // 'q', e.g. to quit setKey(Qt::CTRL + Qt::Key_P); // Ctrl+P, e.g. to print document setKey("Ctrl+P"); // Ctrl+P, e.g. to print document
By default, this property contains an empty key sequence.
访问函数:
QKeySequence | key () const |
void | setKey (const QKeySequence & key ) |
This property holds the shortcut's "What's This?" help text
The text will be shown when the application is in "What's This?" mode and the user types the shortcut key () sequence.
To set "What's This?" help on a menu item (with or without a shortcut key), set the help on the item's action.
默认情况下,此特性包含空字符串。
访问函数:
QString | whatsThis () const |
void | setWhatsThis (const QString & text ) |
另请参阅 QWhatsThis::inWhatsThisMode () 和 QAction::setWhatsThis ().
构造 QShortcut object for the parent widget. Since no shortcut key sequence is specified, the shortcut will not emit any signals.
另请参阅 setKey ().
构造 QShortcut object for the parent widget. The shortcut operates on its parent, listening for QShortcutEvent s that match the key sequence. Depending on the ambiguity of the event, the shortcut will call the member function, or the ambiguousMember function, if the key press was in the shortcut's context .
Destroys the shortcut.
[signal]
void
QShortcut::
activated
()
This signal is emitted when the user types the shortcut's key sequence.
另请参阅 activatedAmbiguously ().
[signal]
void
QShortcut::
activatedAmbiguously
()
When a key sequence is being typed at the keyboard, it is said to be ambiguous as long as it matches the start of more than one shortcut.
When a shortcut's key sequence is completed, activatedAmbiguously() is emitted if the key sequence is still ambiguous (i.e., it is the start of one or more other shortcuts). The activated () signal is not emitted in this case.
另请参阅 activated ().
Returns the shortcut's ID.
另请参阅 QShortcutEvent::shortcutId ().
Returns the shortcut's parent widget.