QwtPanner Class Reference
QwtPanner provides panning of a widget.
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#include <qwt_panner.h>
List of all members.
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] |
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] |
void QwtPanner::getAbortKey |
( |
int & |
key, |
|
|
int & |
state | |
|
) |
| | const |
void QwtPanner::getMouseButton |
( |
int & |
button, |
|
|
int & |
buttonState | |
|
) |
| | const |
bool QwtPanner::isEnabled |
( |
|
) |
const |
bool QwtPanner::isOrientationEnabled |
( |
Qt::Orientation |
o |
) |
const |
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 |
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:
-
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, |
|
|
int |
state = 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:
-
- 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:
-
- See also:
- isEnabled(), eventFilter()
void QwtPanner::setMouseButton |
( |
int |
button, |
|
|
int |
buttonState = Qt::NoButton | |
|
) |
| | |
Change the mouse button The defaults are Qt::LeftButton and Qt::NoButton
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 * |
ke |
) |
[protected, virtual] |
void QwtPanner::widgetKeyReleaseEvent |
( |
QKeyEvent * |
|
) |
[protected, virtual] |
void QwtPanner::widgetMouseMoveEvent |
( |
QMouseEvent * |
me |
) |
[protected, virtual] |
void QwtPanner::widgetMousePressEvent |
( |
QMouseEvent * |
me |
) |
[protected, virtual] |
void QwtPanner::widgetMouseReleaseEvent |
( |
QMouseEvent * |
me |
) |
[protected, virtual] |