QKeySequence Class Reference
The QKeySequence class encapsulates a key sequence as used
by accelerators.
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#include <qkeysequence.h>
Inherits Qt.
List of all member functions.
Public Members
Related Functions
QDataStream &
operator<< ( QDataStream & s, const QKeySequence & keysequence )
QDataStream &
operator>> ( QDataStream & s, QKeySequence & keysequence )
Detailed Description
The QKeySequence class encapsulates a key sequence as used
by accelerators.
A key sequence consists of a keyboard code, optionally combined
with modifiers, e.g. SHIFT, CTRL, ALT, META, or UNICODE_ACCEL. For example, CTRL + Key_P might be a sequence
used as a shortcut for printing a document. The key codes are
listed in qnamespace.h. As an alternative, use UNICODE_ACCEL with the unicode code point of the character. For
example, UNICODE_ACCEL + 'A' gives the same key sequence as Key_A.
Key sequences can be constructed either from an integer key code,
or from a human readable translatable string. A key sequence can
be cast to a QString to obtain a human readable translated version
of the sequence. Translations are done in the "QAccel" context.
See also QAccel and Miscellaneous Classes.
Member Function Documentation
QKeySequence::QKeySequence ()
Constructs an empty key sequence.
QKeySequence::QKeySequence ( const QString & key )
Creates a key sequence from the string key. For example
"Ctrl+O" gives CTRL+UNICODE_ACCEL+'O'. The strings "Ctrl",
"Shift", "Alt" and "Meta" are recognized, as well as their
translated equivalents in the "QAccel" context (using
QObject::tr()).
This contructor is typically used with tr(), so that accelerator keys can be replaced in
translations:
QPopupMenu *file = new QPopupMenu( this );
file->insertItem( tr("&Open..."), this, SLOT(open()),
QKeySequence( tr("Ctrl+O", "File|Open") ) );
Note the "File|Open" translator comment. It is by no means
necessary, but it provides some context for the human translator.
QKeySequence::QKeySequence ( int key )
Constructs a key sequence that has a single key.
The key codes are listed in qnamespace.h and can be
combined with modifiers, e.g. with SHIFT, CTRL, ALT, META or UNICODE_ACCEL.
QKeySequence::QKeySequence ( int k1, int k2, int k3 = 0, int k4 = 0 )
Constructs a key sequence with up to 4 keys k1, k2,
k3 and k4.
The key codes are listed in qnamespace.h and can be
combined with modifiers, e.g. with SHIFT, CTRL, ALT, META or UNICODE_ACCEL.
QKeySequence::QKeySequence ( const QKeySequence & keysequence )
Copy constructor. Makes a copy of keysequence.
QKeySequence::~QKeySequence ()
Destroys the key sequence.
uint QKeySequence::count () const
Returns the number of keys in the key sequence.
Maximum of 4 keys.
bool QKeySequence::isEmpty () const
Returns TRUE if the key sequence is empty.
Matches the sequence with seq.
Returns Qt::Identical if successful, Qt::PartialMatch for matching
but incomplete seq, and Qt::NoMatch if sequences have nothing
in common.
Returns Qt::NoMatch if seq is shorter.
QKeySequence::operator QString () const
Creates an accelerator string for the key sequence.
For instance CTRL+Key_O gives "Ctrl+O". The strings, "Ctrl",
"Shift", etc. are translated (using QObject::tr()) in the
"QAccel" scope.
If the key sequence has no keys, QString::null is returned.
QKeySequence::operator int () const
This function is obsolete. It is provided to keep old source working. We strongly advise against using it in new code.
For backward compatibility: returns the first keycode
as integer. If the key sequence is empty, 0 is returned.
bool QKeySequence::operator!= ( const QKeySequence & keysequence ) const
Returns TRUE if keysequence is not equal to this key sequence;
otherwise returns FALSE.
QKeySequence & QKeySequence::operator= ( const QKeySequence & keysequence )
Assignment operator. Assigns keysequence to this
object.
bool QKeySequence::operator== ( const QKeySequence & keysequence ) const
Returns TRUE if keysequence is equal to this key
sequence; otherwise returns FALSE.
int QKeySequence::operator[] ( uint index ) const
Returns a reference to the element at position index in the key sequence.
This can only be used to read an element.
Related Functions
Writes the key sequence keysequence to the stream s.
See also Format of the QDataStream operators.
Reads a key sequence from the stream s into the key sequence keysequence.
See also Format of the QDataStream operators.
This file is part of the Qt toolkit.
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