Man page - qwtpanner(3)
Packages contains this manual
Manual
QwtPanner
NAMESYNOPSIS
Signals
Public Member Functions
Protected Member Functions
Detailed Description
Constructor & Destructor Documentation
QwtPanner::QwtPanner (QWidget * parent)
Member Function Documentation
QBitmap QwtPanner::contentsMask () const [protected], [virtual]
const QCursor QwtPanner::cursor () const
bool QwtPanner::eventFilter (QObject * object, QEvent * event) [virtual]
QPixmap QwtPanner::grab () const [protected], [virtual]
bool QwtPanner::isEnabled () const
bool QwtPanner::isOrientationEnabled (Qt::Orientation o) const
void QwtPanner::moved (int dx, int dy) [signal]
void QwtPanner::paintEvent (QPaintEvent * event) [protected], [virtual]
void QwtPanner::panned (int dx, int dy) [signal]
void QwtPanner::setAbortKey (int key, Qt::KeyboardModifiers modifiers =Qt::NoModifier)
void QwtPanner::setCursor (const QCursor & cursor)
void QwtPanner::setEnabled (bool on)
void QwtPanner::setMouseButton (Qt::MouseButton button,Qt::KeyboardModifiers modifiers = Qt::NoModifier)
void QwtPanner::setOrientations (Qt::Orientations o)
void QwtPanner::widgetKeyPressEvent (QKeyEvent * keyEvent) [protected],[virtual]
void QwtPanner::widgetKeyReleaseEvent (QKeyEvent * keyEvent) [protected],[virtual]
void QwtPanner::widgetMouseMoveEvent (QMouseEvent * mouseEvent)[protected], [virtual]
void QwtPanner::widgetMousePressEvent (QMouseEvent * mouseEvent)[protected], [virtual]
void QwtPanner::widgetMouseReleaseEvent (QMouseEvent * mouseEvent)[protected], [virtual]
Author
NAME
QwtPanner - QwtPanner provides panning of a widget.
SYNOPSIS
#include <qwt_panner.h>
Inherits QWidget.
Inherited by QwtPlotPanner .
Signals
void
panned
(int dx, int dy)
void
moved
(int dx, int dy)
Public Member Functions
QwtPanner
(QWidget *parent)
virtual
˜QwtPanner
()
Destructor.
void
setEnabled
(bool)
En/disable the panner.
bool
isEnabled
() const
void
setMouseButton
(Qt::MouseButton,
Qt::KeyboardModifiers=Qt::NoModifier)
void
getMouseButton
(Qt::MouseButton &button,
Qt::KeyboardModifiers &) const
Get mouse button and modifiers used for panning.
void
setAbortKey
(int key,
Qt::KeyboardModifiers=Qt::NoModifier)
void
getAbortKey
(int &key, Qt::KeyboardModifiers
&) const
Get the abort key and modifiers.
void
setCursor
(const QCursor &)
const QCursor
cursor
() const
void
setOrientations
(Qt::Orientations)
Qt::Orientations
orientations
() const
Return the orientation, where paning is enabled.
bool
isOrientationEnabled
(Qt::Orientation) const
virtual bool
eventFilter
(QObject *, QEvent *)
Event filter.
Protected Member Functions
virtual void
widgetMousePressEvent
(QMouseEvent *)
virtual void
widgetMouseReleaseEvent
(QMouseEvent *)
virtual void
widgetMouseMoveEvent
(QMouseEvent *)
virtual void
widgetKeyPressEvent
(QKeyEvent *)
virtual void
widgetKeyReleaseEvent
(QKeyEvent *)
virtual void
paintEvent
(QPaintEvent *)
Paint event.
virtual QBitmap
contentsMask
() const
Calculate a mask for the contents of the panned widget.
virtual QPixmap
grab
() const
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. 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
Member Function Documentation
QBitmap QwtPanner::contentsMask () const [protected], [virtual]
Calculate a mask for the contents of the panned widget. Sometimes only parts of the contents of a widget should be panned. F.e. for a widget with a styled background with rounded borders only the area inside of the border should be panned.
Returns:
An empty bitmap, indicating no mask
Reimplemented in QwtPlotPanner .
const QCursor QwtPanner::cursor () const
Returns:
Cursor that is active while panning
See also:
setCursor()
bool QwtPanner::eventFilter (QObject * object, QEvent * event) [virtual]
Event filter. When isEnabled() is true mouse events of the observed widget are filtered.
Parameters:
object
Object to be
filtered
event
Event
Returns:
Always false, beside for paint events for the parent widget.
See also:
widgetMousePressEvent() , widgetMouseReleaseEvent() , widgetMouseMoveEvent()
QPixmap QwtPanner::grab () const [protected], [virtual]
Grab the widget into a pixmap.
Returns:
Grabbed pixmap
Reimplemented in QwtPlotPanner .
bool QwtPanner::isEnabled () const
Returns:
true when enabled, false otherwise
See also:
setEnabled , eventFilter()
bool QwtPanner::isOrientationEnabled (Qt::Orientation o) const
Returns:
True if an orientation is enabled
See also:
orientations() , setOrientations()
void QwtPanner::moved (int dx, int dy) [signal]
Signal emitted, while the widget moved, but panning is not finished.
Parameters:
dx
Offset in horizontal
direction
dy
Offset in vertical direction
void QwtPanner::paintEvent (QPaintEvent * event) [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:
event Paint event
void QwtPanner::panned (int dx, int dy) [signal]
Signal emitted, when panning is done
Parameters:
dx
Offset in horizontal
direction
dy
Offset in vertical direction
void QwtPanner::setAbortKey (int key, Qt::KeyboardModifiers modifiers =Qt::NoModifier)
Change the abort key The defaults are Qt::Key_Escape and Qt::NoModifiers
Parameters:
key
Key ( See
Qt::Keycode )
modifiers
Keyboard modifiers
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 (bool on)
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 (Qt::MouseButton button,Qt::KeyboardModifiers modifiers = Qt::NoModifier)
Change the mouse button and modifiers used for panning The defaults are Qt::LeftButton and Qt::NoModifier
void QwtPanner::setOrientations (Qt::Orientations o)
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 * keyEvent) [protected],[virtual]
Handle a key press event for the observed widget.
Parameters:
keyEvent Key event
See also:
eventFilter() , widgetKeyReleaseEvent()
void QwtPanner::widgetKeyReleaseEvent (QKeyEvent * keyEvent) [protected],[virtual]
Handle a key release event for the observed widget.
Parameters:
keyEvent Key event
See also:
eventFilter() , widgetKeyReleaseEvent()
void QwtPanner::widgetMouseMoveEvent (QMouseEvent * mouseEvent)[protected], [virtual]
Handle a mouse move event for the observed widget.
Parameters:
mouseEvent Mouse event
See also:
eventFilter() , widgetMousePressEvent() , widgetMouseReleaseEvent()
void QwtPanner::widgetMousePressEvent (QMouseEvent * mouseEvent)[protected], [virtual]
Handle a mouse press event for the observed widget.
Parameters:
mouseEvent Mouse event
See also:
eventFilter() , widgetMouseReleaseEvent() , widgetMouseMoveEvent() ,
void QwtPanner::widgetMouseReleaseEvent (QMouseEvent * mouseEvent)[protected], [virtual]
Handle a mouse release event for the observed widget.
Parameters:
mouseEvent Mouse event
See also:
eventFilter() , widgetMousePressEvent() , widgetMouseMoveEvent() ,
Author
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