Qt 4.8
Signals | Public Functions | Protected Functions | Properties | List of all members
QDeclarativeApplication Class Reference

#include <qdeclarativeapplication_p.h>

Inheritance diagram for QDeclarativeApplication:
QObject

Signals

void activeChanged ()
 
void layoutDirectionChanged ()
 
- Signals inherited from QObject
void destroyed (QObject *=0)
 This signal is emitted immediately before the object obj is destroyed, and can not be blocked. More...
 

Public Functions

bool active () const
 
Qt::LayoutDirection layoutDirection () const
 
 QDeclarativeApplication (QObject *parent=0)
 
virtual ~QDeclarativeApplication ()
 
- Public Functions inherited from QObject
bool blockSignals (bool b)
 If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it). More...
 
const QObjectListchildren () const
 Returns a list of child objects. More...
 
bool connect (const QObject *sender, const char *signal, const char *member, Qt::ConnectionType type=Qt::AutoConnection) const
 
bool disconnect (const char *signal=0, const QObject *receiver=0, const char *member=0)
 
bool disconnect (const QObject *receiver, const char *member=0)
 
void dumpObjectInfo ()
 Dumps information about signal connections, etc. More...
 
void dumpObjectTree ()
 Dumps a tree of children to the debug output. More...
 
QList< QByteArraydynamicPropertyNames () const
 Returns the names of all properties that were dynamically added to the object using setProperty(). More...
 
virtual bool event (QEvent *)
 This virtual function receives events to an object and should return true if the event e was recognized and processed. More...
 
template<typename T >
findChild (const QString &aName=QString()) const
 Returns the child of this object that can be cast into type T and that is called name, or 0 if there is no such object. More...
 
template<typename T >
QList< T > findChildren (const QString &aName=QString()) const
 Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects. More...
 
template<typename T >
QList< T > findChildren (const QRegExp &re) const
 
bool inherits (const char *classname) const
 Returns true if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns false. More...
 
void installEventFilter (QObject *)
 Installs an event filter filterObj on this object. More...
 
bool isWidgetType () const
 Returns true if the object is a widget; otherwise returns false. More...
 
void killTimer (int id)
 Kills the timer with timer identifier, id. More...
 
virtual const QMetaObjectmetaObject () const
 Returns a pointer to the meta-object of this object. More...
 
void moveToThread (QThread *thread)
 Changes the thread affinity for this object and its children. More...
 
QString objectName () const
 
QObjectparent () const
 Returns a pointer to the parent object. More...
 
QVariant property (const char *name) const
 Returns the value of the object's name property. More...
 
Q_INVOKABLE QObject (QObject *parent=0)
 Constructs an object with parent object parent. More...
 
void removeEventFilter (QObject *)
 Removes an event filter object obj from this object. More...
 
void setObjectName (const QString &name)
 
void setParent (QObject *)
 Makes the object a child of parent. More...
 
bool setProperty (const char *name, const QVariant &value)
 Sets the value of the object's name property to value. More...
 
void setUserData (uint id, QObjectUserData *data)
 
bool signalsBlocked () const
 Returns true if signals are blocked; otherwise returns false. More...
 
int startTimer (int interval)
 Starts a timer and returns a timer identifier, or returns zero if it could not start a timer. More...
 
QThreadthread () const
 Returns the thread in which the object lives. More...
 
QObjectUserDatauserData (uint id) const
 
virtual ~QObject ()
 Destroys the object, deleting all its child objects. More...
 

Protected Functions

bool eventFilter (QObject *obj, QEvent *event)
 Filters events if this object has been installed as an event filter for the watched object. More...
 
- Protected Functions inherited from QObject
virtual void childEvent (QChildEvent *)
 This event handler can be reimplemented in a subclass to receive child events. More...
 
virtual void connectNotify (const char *signal)
 This virtual function is called when something has been connected to signal in this object. More...
 
virtual void customEvent (QEvent *)
 This event handler can be reimplemented in a subclass to receive custom events. More...
 
virtual void disconnectNotify (const char *signal)
 This virtual function is called when something has been disconnected from signal in this object. More...
 
 QObject (QObjectPrivate &dd, QObject *parent=0)
 
int receivers (const char *signal) const
 Returns the number of receivers connected to the signal. More...
 
QObjectsender () const
 Returns a pointer to the object that sent the signal, if called in a slot activated by a signal; otherwise it returns 0. More...
 
int senderSignalIndex () const
 
virtual void timerEvent (QTimerEvent *)
 This event handler can be reimplemented in a subclass to receive timer events for the object. More...
 

Properties

bool active
 
Qt::LayoutDirection layoutDirection
 

Additional Inherited Members

- Public Slots inherited from QObject
void deleteLater ()
 Schedules this object for deletion. More...
 
- Static Public Functions inherited from QObject
static bool connect (const QObject *sender, const char *signal, const QObject *receiver, const char *member, Qt::ConnectionType=Qt::AutoConnection)
 Creates a connection of the given type from the signal in the sender object to the method in the receiver object. More...
 
static bool connect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method, Qt::ConnectionType type=Qt::AutoConnection)
 
static bool disconnect (const QObject *sender, const char *signal, const QObject *receiver, const char *member)
 Disconnects signal in object sender from method in object receiver. More...
 
static bool disconnect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &member)
 
static uint registerUserData ()
 
static QString tr (const char *sourceText, const char *comment=0, int n=-1)
 
static QString trUtf8 (const char *sourceText, const char *comment=0, int n=-1)
 
- Static Public Variables inherited from QObject
static const QMetaObject staticMetaObject
 This variable stores the meta-object for the class. More...
 
- Protected Variables inherited from QObject
QScopedPointer< QObjectDatad_ptr
 
- Static Protected Variables inherited from QObject
static const QMetaObject staticQtMetaObject
 

Detailed Description

Definition at line 56 of file qdeclarativeapplication_p.h.

Constructors and Destructors

◆ QDeclarativeApplication()

QDeclarativeApplication::QDeclarativeApplication ( QObject parent = 0)
explicit

Definition at line 63 of file qdeclarativeapplication.cpp.

63  : QObject(*new QDeclarativeApplicationPrivate(), parent)
64 {
65  if (qApp)
66  qApp->installEventFilter(this);
67 }
#define qApp
Q_INVOKABLE QObject(QObject *parent=0)
Constructs an object with parent object parent.
Definition: qobject.cpp:753

◆ ~QDeclarativeApplication()

QDeclarativeApplication::~QDeclarativeApplication ( )
virtual

Definition at line 69 of file qdeclarativeapplication.cpp.

70 {
71 }

Functions

◆ active()

bool QDeclarativeApplication::active ( ) const

◆ activeChanged

void QDeclarativeApplication::activeChanged ( )
signal

Referenced by eventFilter().

◆ eventFilter()

bool QDeclarativeApplication::eventFilter ( QObject ,
QEvent  
)
protectedvirtual

Filters events if this object has been installed as an event filter for the watched object.

In your reimplementation of this function, if you want to filter the event out, i.e. stop it being handled further, return true; otherwise return false.

Example:

class MainWindow : public QMainWindow
{
public:
MainWindow();
protected:
bool eventFilter(QObject *obj, QEvent *ev);
private:
QTextEdit *textEdit;
};
MainWindow::MainWindow()
{
textEdit = new QTextEdit;
setCentralWidget(textEdit);
textEdit->installEventFilter(this);
}
bool MainWindow::eventFilter(QObject *obj, QEvent *event)
{
if (obj == textEdit) {
if (event->type() == QEvent::KeyPress) {
QKeyEvent *keyEvent = static_cast<QKeyEvent*>(event);
qDebug() << "Ate key press" << keyEvent->key();
return true;
} else {
return false;
}
} else {
// pass the event on to the parent class
return QMainWindow::eventFilter(obj, event);
}
}

Notice in the example above that unhandled events are passed to the base class's eventFilter() function, since the base class might have reimplemented eventFilter() for its own internal purposes.

Warning
If you delete the receiver object in this function, be sure to return true. Otherwise, Qt will forward the event to the deleted object and the program might crash.
See also
installEventFilter()

Reimplemented from QObject.

Definition at line 85 of file qdeclarativeapplication.cpp.

86 {
87  Q_UNUSED(obj)
89  if (event->type() == QEvent::ApplicationActivate
90  || event->type() == QEvent::ApplicationDeactivate) {
91  bool active = d->active;
92  if (event->type() == QEvent::ApplicationActivate)
93  active = true;
94  else if (event->type() == QEvent::ApplicationDeactivate)
95  active = false;
96 
97  if (d->active != active) {
98  d->active = active;
100  }
101  }
102  if (event->type() == QEvent::LayoutDirectionChange) {
104  if (d->layoutDirection != direction) {
105  d->layoutDirection = direction;
107  }
108  }
109  return false;
110 }
double d
Definition: qnumeric_p.h:62
static Qt::LayoutDirection layoutDirection()
virtual bool event(QEvent *)
This virtual function receives events to an object and should return true if the event e was recogniz...
Definition: qobject.cpp:1200
#define Q_D(Class)
Definition: qglobal.h:2482
#define emit
Definition: qobjectdefs.h:76
LayoutDirection
Definition: qnamespace.h:1580
#define Q_UNUSED(x)
Indicates to the compiler that the parameter with the specified name is not used in the body of a fun...
Definition: qglobal.h:1729
Qt::LayoutDirection direction

◆ layoutDirection()

Qt::LayoutDirection QDeclarativeApplication::layoutDirection ( ) const

◆ layoutDirectionChanged

void QDeclarativeApplication::layoutDirectionChanged ( )
signal

Referenced by eventFilter().

Properties

◆ active

bool QDeclarativeApplication::active
private

Definition at line 59 of file qdeclarativeapplication_p.h.

◆ layoutDirection

Qt::LayoutDirection QDeclarativeApplication::layoutDirection
private

Definition at line 60 of file qdeclarativeapplication_p.h.


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