KToolTipHelper Class Reference

#include <KToolTipHelper>

Inheritance diagram for KToolTipHelper:

Public Member Functions
virtual bool	eventFilter (QObject *watched, QEvent *event) override
Public Member Functions inherited from QObject
	QObject (QObject *parent)
QBindable< QString >	bindableObjectName ()
bool	blockSignals (bool block)
const QObjectList &	children () const const
QMetaObject::Connection	connect (const QObject *sender, const char *signal, const char *method, Qt::ConnectionType type) const const
void	deleteLater ()
void	destroyed (QObject *obj)
bool	disconnect (const char *signal, const QObject *receiver, const char *method) const const
bool	disconnect (const QObject *receiver, const char *method) const const
void	dumpObjectInfo () const const
void	dumpObjectTree () const const
QList< QByteArray >	dynamicPropertyNames () const const
virtual bool	event (QEvent *e)
T	findChild (const QString &name, Qt::FindChildOptions options) const const
QList< T >	findChildren (const QRegularExpression &re, Qt::FindChildOptions options) const const
QList< T >	findChildren (const QString &name, Qt::FindChildOptions options) const const
QList< T >	findChildren (Qt::FindChildOptions options) const const
bool	inherits (const char *className) const const
void	installEventFilter (QObject *filterObj)
bool	isQuickItemType () const const
bool	isWidgetType () const const
bool	isWindowType () const const
void	killTimer (int id)
virtual const QMetaObject *	metaObject () const const
void	moveToThread (QThread *targetThread)
QString	objectName () const const
void	objectNameChanged (const QString &objectName)
QObject *	parent () const const
QVariant	property (const char *name) const const
	Q_CLASSINFO (Name, Value)
	Q_EMIT Q_EMIT
	Q_ENUM (...)
	Q_ENUM_NS (...)
	Q_ENUMS (...)
	Q_FLAG (...)
	Q_FLAG_NS (...)
	Q_FLAGS (...)
	Q_GADGET Q_GADGET
	Q_GADGET_EXPORT (EXPORT_MACRO)
	Q_INTERFACES (...)
	Q_INVOKABLE Q_INVOKABLE
	Q_MOC_INCLUDE Q_MOC_INCLUDE
	Q_NAMESPACE Q_NAMESPACE
	Q_NAMESPACE_EXPORT (EXPORT_MACRO)
	Q_OBJECT Q_OBJECT
	Q_PROPERTY (...)
	Q_REVISION Q_REVISION
	Q_SET_OBJECT_NAME (Object)
	Q_SIGNAL Q_SIGNAL
	Q_SIGNALS Q_SIGNALS
	Q_SLOT Q_SLOT
	Q_SLOTS Q_SLOTS
T	qobject_cast (const QObject *object)
T	qobject_cast (QObject *object)
	QT_NO_NARROWING_CONVERSIONS_IN_CONNECT QT_NO_NARROWING_CONVERSIONS_IN_CONNECT
void	removeEventFilter (QObject *obj)
void	setObjectName (const QString &name)
void	setObjectName (QAnyStringView name)
void	setParent (QObject *parent)
bool	setProperty (const char *name, const QVariant &value)
bool	setProperty (const char *name, QVariant &&value)
bool	signalsBlocked () const const
int	startTimer (int interval, Qt::TimerType timerType)
int	startTimer (std::chrono::milliseconds interval, Qt::TimerType timerType)
QThread *	thread () const const

Static Public Member Functions
static KToolTipHelper *	instance ()
static const QString	whatsThisHintOnly ()
Static Public Member Functions inherited from QObject
QMetaObject::Connection	connect (const QObject *sender, const char *signal, const QObject *receiver, const char *method, Qt::ConnectionType type)
QMetaObject::Connection	connect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method, Qt::ConnectionType type)
QMetaObject::Connection	connect (const QObject *sender, PointerToMemberFunction signal, const QObject *context, Functor functor, Qt::ConnectionType type)
QMetaObject::Connection	connect (const QObject *sender, PointerToMemberFunction signal, const QObject *receiver, PointerToMemberFunction method, Qt::ConnectionType type)
QMetaObject::Connection	connect (const QObject *sender, PointerToMemberFunction signal, Functor functor)
bool	disconnect (const QMetaObject::Connection &connection)
bool	disconnect (const QObject *sender, const char *signal, const QObject *receiver, const char *method)
bool	disconnect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method)
bool	disconnect (const QObject *sender, PointerToMemberFunction signal, const QObject *receiver, PointerToMemberFunction method)
QString	tr (const char *sourceText, const char *disambiguation, int n)

Additional Inherited Members
Properties inherited from QObject
	objectName
Public Attributes inherited from QObject
typedef	QObjectList
Protected Member Functions inherited from QObject
virtual void	childEvent (QChildEvent *event)
virtual void	connectNotify (const QMetaMethod &signal)
virtual void	customEvent (QEvent *event)
virtual void	disconnectNotify (const QMetaMethod &signal)
bool	isSignalConnected (const QMetaMethod &signal) const const
int	receivers (const char *signal) const const
QObject *	sender () const const
int	senderSignalIndex () const const
virtual void	timerEvent (QTimerEvent *event)

Detailed Description

An event filter used to enhance tooltips.

Example: Without this class, a tooltip of a QToolButton of a "New" action will read something like "New File". Using this class, the tooltip can be enhanced to read something like "New File (Ctrl+N)" and in the next line smaller "Press Shift for help.". Pressing Shift will open the "What's This" context help for that widget. If a hyperlink in that help is clicked, the corresponding event will also be filtered by this class and open the linked location.

The extra text added to tooltips is only shown when available and where it makes sense. If a QToolButton has no associated shortcut and an empty QWidget::whatsThis(), this class won't tamper with the requested tooltip at all.

This class also activates tooltips for actions in QMenus but only when it makes sense like when the tooltip isn't equal to the already displayed text.

If you want the "Press Shift for help." line to be displayed for a widget that has whatsThis() but no toolTip() take a look at KToolTipHelper::whatsThisHintOnly().

The enhanced tooltips can be enabled at any time after the QApplication was constructed with

qApp->installEventFilter(KToolTipHelper::instance());

Therefore, to de-activate them you can call

qApp->removeEventFilter(KToolTipHelper::instance());

any time later.

If you want KToolTipHelper to not tamper with certain QEvents, e.g. you want to handle some tooltips differently or you want to change what happens when a QWhatsThisClickedEvent is processed, first remove KToolTipHelper as an event filter just like in the line of code above. Then create your own custom EventFilter that handles those QEvents differently and for all cases that you don't want to handle differently call

return KToolTipHelper::instance()->eventFilter(watched, event);

KMainWindow will have this EventFilter installed by default from framework version 5.84 onward so if you want to opt out of that, remove the EventFilter in the constructor of your MainWindow class inheriting from KMainWindow.

See also

QToolTip

Since

5.84

Definition at line 68 of file ktooltiphelper.h.

Member Function Documentation

eventFilter()

bool KToolTipHelper::eventFilter ( QObject * watched, QEvent * event )

overridevirtual

Filters QEvent::ToolTip if an enhanced tooltip is available for the widget.

Filters the QEvent::KeyPress that is used to expand an expandable tooltip. Filters QEvent::WhatsThisClicked so hyperlinks in whatsThis() texts work.

See also

QObject::eventFilter()

QHelpEvent

Reimplemented from QObject.

Definition at line 58 of file ktooltiphelper.cpp.

instance()

KToolTipHelper * KToolTipHelper::instance ( )

static

Definition at line 28 of file ktooltiphelper.cpp.

whatsThisHintOnly()

const QString KToolTipHelper::whatsThisHintOnly ( )

static

Use this to have a widget show "Press Shift for help." as its tooltip.

widget->setToolTip(KToolTipHelper::whatsThisHintOnly());

KToolTipHelper won't show that tooltip if the widget's whatsThis() is empty.

Returns

a QString that is interpreted by this class to show the expected tooltip.

Definition at line 79 of file ktooltiphelper.cpp.

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The documentation for this class was generated from the following files:

• ktooltiphelper.h
• ktooltiphelper.cpp