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< td align = "right" valign = "center" > < img src = "logo32.png" align = "right" width = "64" height = "32" border = "0" > < / td > < / tr > < / table > < h1 align = center > TQKeyEvent Class Reference< / h1 >
< p > The TQKeyEvent class contains describes a key event.
< a href = "#details" > More...< / a >
< p > < tt > #include < < a href = "qevent-h.html" > ntqevent.h< / a > > < / tt >
< p > Inherits < a href = "ntqevent.html" > TQEvent< / a > .
< p > < a href = "qkeyevent-members.html" > List of all member functions.< / a >
< h2 > Public Members< / h2 >
< ul >
< li class = fn > < a href = "#TQKeyEvent" > < b > TQKeyEvent< / b > < / a > ( Type type, int key, int ascii, int state, const TQString & text = TQString::null, bool autorep = FALSE, ushort count = 1 )< / li >
< li class = fn > int < a href = "#key" > < b > key< / b > < / a > () const< / li >
< li class = fn > int < a href = "#ascii" > < b > ascii< / b > < / a > () const< / li >
< li class = fn > ButtonState < a href = "#state" > < b > state< / b > < / a > () const< / li >
< li class = fn > ButtonState < a href = "#stateAfter" > < b > stateAfter< / b > < / a > () const< / li >
< li class = fn > bool < a href = "#isAccepted" > < b > isAccepted< / b > < / a > () const< / li >
< li class = fn > TQString < a href = "#text" > < b > text< / b > < / a > () const< / li >
< li class = fn > bool < a href = "#isAutoRepeat" > < b > isAutoRepeat< / b > < / a > () const< / li >
< li class = fn > int < a href = "#count" > < b > count< / b > < / a > () const< / li >
< li class = fn > void < a href = "#accept" > < b > accept< / b > < / a > ()< / li >
< li class = fn > void < a href = "#ignore" > < b > ignore< / b > < / a > ()< / li >
< / ul >
< hr > < a name = "details" > < / a > < h2 > Detailed Description< / h2 >
The TQKeyEvent class contains describes a key event.
< p >
< p > Key events occur when a key is pressed or released when a widget
has keyboard input focus.
< p > A key event contains a special accept flag that indicates whether the
receiver wants the key event. You should call < a href = "#ignore" > TQKeyEvent::ignore< / a > () if the
key press or release event is not handled by your widget. A key event is
propagated up the parent widget chain until a widget accepts it with
< a href = "#accept" > TQKeyEvent::accept< / a > () or an event filter consumes it.
Key events for multi media keys are ignored by default. You should call
TQKeyEvent::accept() if your widget handles those events.
< p > The TQWidget::setEnable() function can be used to enable or disable
mouse and keyboard events for a widget.
< p > The event handlers < a href = "tqwidget.html#keyPressEvent" > TQWidget::keyPressEvent< / a > () and
< a href = "tqwidget.html#keyReleaseEvent" > TQWidget::keyReleaseEvent< / a > () receive key events.
< p > < p > See also < a href = "qfocusevent.html" > TQFocusEvent< / a > , < a href = "tqwidget.html#grabKeyboard" > TQWidget::grabKeyboard< / a > (), and < a href = "events.html" > Event Classes< / a > .
< hr > < h2 > Member Function Documentation< / h2 >
< h3 class = fn > < a name = "TQKeyEvent" > < / a > TQKeyEvent::TQKeyEvent ( < a href = "ntqevent.html#Type-enum" > Type< / a > type, int key, int ascii, int state, const < a href = "ntqstring.html" > TQString< / a > & text = TQString::null, bool autorep = FALSE, ushort count = 1 )
< / h3 >
< p > Constructs a key event object.
< p > The < em > type< / em > parameter must be < a href = "ntqevent.html#Type-enum" > TQEvent::KeyPress< / a > or < a href = "ntqevent.html#Type-enum" > TQEvent::KeyRelease< / a > . If < em > key< / em > is 0 the event is not a result of a
known key (e.g. it may be the result of a compose sequence or
keyboard macro). < em > ascii< / em > is the ASCII code of the key that was
pressed or released. < em > state< / em > holds the keyboard modifiers. < em > text< / em > is the Unicode text that the key generated. If < em > autorep< / em > is
TRUE, < a href = "#isAutoRepeat" > isAutoRepeat< / a > () will be TRUE. < em > count< / em > is the number of
single keys.
< p > The accept flag is set to TRUE.
< h3 class = fn > void < a name = "accept" > < / a > TQKeyEvent::accept ()
< / h3 >
< p > Sets the accept flag of the key event object.
< p > Setting the accept parameter indicates that the receiver of the
event wants the key event. Unwanted key events are sent to the
parent widget.
< p > The accept flag is set by default.
< p > < p > See also < a href = "#ignore" > ignore< / a > ().
< h3 class = fn > int < a name = "ascii" > < / a > TQKeyEvent::ascii () const
< / h3 >
< p > Returns the ASCII code of the key that was pressed or released. We
recommend using < a href = "#text" > text< / a > () instead.
< p > < p > See also < a href = "#text" > text< / a > ().
< p > Example: < a href = "picture-example.html#x109" > picture/picture.cpp< / a > .
< h3 class = fn > int < a name = "count" > < / a > TQKeyEvent::count () const
< / h3 >
< p > Returns the number of single keys for this event. If < a href = "#text" > text< / a > () is not
empty, this is simply the length of the string.
< p > < p > See also < a href = "tqwidget.html#setKeyCompression" > TQWidget::setKeyCompression< / a > ().
< h3 class = fn > void < a name = "ignore" > < / a > TQKeyEvent::ignore ()
< / h3 >
< p > Clears the accept flag parameter of the key event object.
< p > Clearing the accept parameter indicates that the event receiver
does not want the key event. Unwanted key events are sent to the
parent widget.
< p > The accept flag is set by default.
< p > < p > See also < a href = "#accept" > accept< / a > ().
< h3 class = fn > bool < a name = "isAccepted" > < / a > TQKeyEvent::isAccepted () const
< / h3 >
< p > Returns TRUE if the receiver of the event wants to keep the key;
otherwise returns FALSE
< h3 class = fn > bool < a name = "isAutoRepeat" > < / a > TQKeyEvent::isAutoRepeat () const
< / h3 >
< p > Returns TRUE if this event comes from an auto-repeating key and
FALSE if it comes from an initial key press.
< p > Note that if the event is a multiple-key compressed event that is
partly due to auto-repeat, this function could return either TRUE
or FALSE indeterminately.
< h3 class = fn > int < a name = "key" > < / a > TQKeyEvent::key () const
< / h3 >
< p > Returns the code of the key that was pressed or released.
< p > See < a href = "ntqt.html#Key-enum" > TQt::Key< / a > for the list of keyboard codes. These codes are
independent of the underlying window system.
< p > A value of either 0 or Key_unknown means that the event is not
the result of a known key (e.g. it may be the result of a compose
sequence or a keyboard macro, or due to key event compression).
< p > < p > See also < a href = "tqwidget.html#setKeyCompression" > TQWidget::setKeyCompression< / a > ().
< p > Example: < a href = "fileiconview-example.html#x853" > fileiconview/qfileiconview.cpp< / a > .
< h3 class = fn > < a href = "ntqt.html#ButtonState-enum" > ButtonState< / a > < a name = "state" > < / a > TQKeyEvent::state () const
< / h3 >
< p > Returns the keyboard modifier flags that existed immediately
before the event occurred.
< p > The returned value is < a href = "ntqt.html#ButtonState-enum" > ShiftButton< / a > , < a href = "ntqt.html#ButtonState-enum" > ControlButton< / a > , < a href = "ntqt.html#ButtonState-enum" > AltButton< / a >
and < a href = "ntqt.html#ButtonState-enum" > MetaButton< / a > OR'ed together.
< p > < p > See also < a href = "#stateAfter" > stateAfter< / a > ().
< p > Example: < a href = "fileiconview-example.html#x854" > fileiconview/qfileiconview.cpp< / a > .
< h3 class = fn > < a href = "ntqt.html#ButtonState-enum" > ButtonState< / a > < a name = "stateAfter" > < / a > TQKeyEvent::stateAfter () const
< / h3 >
< p > Returns the keyboard modifier flags that existed immediately after
the event occurred.
< p > < b > Warning:< / b > This function cannot be trusted.
< p > < p > See also < a href = "#state" > state< / a > ().
< h3 class = fn > < a href = "ntqstring.html" > TQString< / a > < a name = "text" > < / a > TQKeyEvent::text () const
< / h3 >
< p > Returns the Unicode text that this key generated. The text returned
migth be empty, which is the case when pressing or
releasing modifying keys as Shift, Control, Alt and Meta. In these
cases < a href = "#key" > key< / a > () will contain a valid value.
< p > < p > See also < a href = "tqwidget.html#setKeyCompression" > TQWidget::setKeyCompression< / a > ().
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