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QwtPanner(3) Qwt User's Guide QwtPanner(3)

NAME

QwtPanner -
QwtPanner provides panning of a widget.
 

SYNOPSIS

#include <qwt_panner.h>
Inherited by QwtPlotPanner.

Signals


void moved (int dx, int dy)
 
void panned (int dx, int dy)
 

Public Member Functions


const QCursor cursor () const
 
virtual bool eventFilter (QObject *, QEvent *)
 
void getAbortKey (int &key, int &state) const
 
void getMouseButton (int &button, int &buttonState) const
 
bool isEnabled () const
 
bool isOrientationEnabled (Qt::Orientation) const
 
Qt::Orientations orientations () const
 
QwtPanner (QWidget *parent)
 
void setAbortKey (int key, int state=Qt::NoButton)
 
void setCursor (const QCursor &)
 
void setEnabled (bool)
 
void setMouseButton (int button, int buttonState=Qt::NoButton)
 
void setOrientations (Qt::Orientations)
 
virtual ~QwtPanner ()
 

Protected Member Functions


virtual void paintEvent (QPaintEvent *)
 
virtual void widgetKeyPressEvent (QKeyEvent *)
 
virtual void widgetKeyReleaseEvent (QKeyEvent *)
 
virtual void widgetMouseMoveEvent (QMouseEvent *)
 
virtual void widgetMousePressEvent (QMouseEvent *)
 
virtual void widgetMouseReleaseEvent (QMouseEvent *)
 

Detailed Description

QwtPanner provides panning of a widget.
 
QwtPanner grabs the contents of a widget, that can be dragged in all directions. The offset between the start and the end position is emitted by the panned signal.
QwtPanner grabs the content of the widget into a pixmap and moves the pixmap around, without initiating any repaint events for the widget. Areas, that are not part of content are not painted while panning in in process. This makes panning fast enough for widgets, where repaints are too slow for mouse movements.
For widgets, where repaints are very fast it might be better to implement panning manually by mapping mouse events into paint events.

Constructor & Destructor Documentation

QwtPanner::QwtPanner (QWidget *parent) Creates an panner that is enabled for the left mouse button.

Parameters:
parent Parent widget to be panned
 

QwtPanner::~QwtPanner () [virtual]

Destructor.

Member Function Documentation

const QCursor QwtPanner::cursor () const Returns:

Cursor that is active while panning
See also:
setCursor()
 

bool QwtPanner::eventFilter (QObject *o, QEvent *e) [virtual]

Event filter. When isEnabled() the mouse events of the observed widget are filtered.
See also:
widgetMousePressEvent(), widgetMouseReleaseEvent(), widgetMouseMoveEvent()
 

void QwtPanner::getAbortKey (int &key, int &state) const

Get the abort key.

void QwtPanner::getMouseButton (int &button, int &buttonState) const

Get the mouse button.

bool QwtPanner::isEnabled () const Returns:

true when enabled, false otherwise
See also:
setEnabled, eventFilter()
 

bool QwtPanner::isOrientationEnabled (Qt::Orientationo) const Return true if a orientatio is enabled

See also:
orientations(), setOrientations()
 

void QwtPanner::moved (intdx, intdy) [signal] Signal emitted, while the widget moved, but panning is not finished.

Parameters:
dx Offset in horizontal direction
 
dy Offset in vertical direction
 

Qt::Orientations QwtPanner::orientations () const

Return the orientation, where paning is enabled.

void QwtPanner::paintEvent (QPaintEvent *pe) [protected, virtual]

Paint event. Repaint the grabbed pixmap on its current position and fill the empty spaces by the background of the parent widget.
Parameters:
pe Paint event
 

void QwtPanner::panned (intdx, intdy) [signal] Signal emitted, when panning is done

Parameters:
dx Offset in horizontal direction
 
dy Offset in vertical direction
 

void QwtPanner::setAbortKey (intkey, intstate = Qt::NoButton) Change the abort key The defaults are Qt::Key_Escape and Qt::NoButton

Parameters:
key Key ( See Qt::Keycode )
 
state State
 

void QwtPanner::setCursor (const QCursor &cursor) Change the cursor, that is active while panning The default is the cursor of the parent widget.

Parameters:
cursor New cursor
See also:
setCursor()
 

void QwtPanner::setEnabled (boolon)

En/disable the panner. When enabled is true an event filter is installed for the observed widget, otherwise the event filter is removed.
Parameters:
on true or false
See also:
isEnabled(), eventFilter()
 

void QwtPanner::setMouseButton (intbutton, intbuttonState = Qt::NoButton) Change the mouse button The defaults are Qt::LeftButton and Qt::NoButton

void QwtPanner::setOrientations (Qt::Orientationso) Set the orientations, where panning is enabled The default value is in both directions: Qt::Horizontal | Qt::Vertical

/param o Orientation

void QwtPanner::widgetKeyPressEvent (QKeyEvent *ke) [protected, virtual] Handle a key press event for the observed widget.

Parameters:
ke Key event
See also:
eventFilter(), widgetKeyReleaseEvent()
 

void QwtPanner::widgetKeyReleaseEvent (QKeyEvent *) [protected, virtual] Handle a key release event for the observed widget.

See also:
eventFilter(), widgetKeyReleaseEvent()
 

void QwtPanner::widgetMouseMoveEvent (QMouseEvent *me) [protected, virtual] Handle a mouse move event for the observed widget.

Parameters:
me Mouse event
See also:
eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent()
 

void QwtPanner::widgetMousePressEvent (QMouseEvent *me) [protected, virtual] Handle a mouse press event for the observed widget.

Parameters:
me Mouse event
See also:
eventFilter(), widgetMouseReleaseEvent(), widgetMouseMoveEvent(),
 

void QwtPanner::widgetMouseReleaseEvent (QMouseEvent *me) [protected, virtual] Handle a mouse release event for the observed widget.

Parameters:
me Mouse event
See also:
eventFilter(), widgetMousePressEvent(), widgetMouseMoveEvent(),
 
 

Author

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Mon Aug 1 2011 Version 5.2.2