QwtMagnifier - Man Page
QwtMagnifier provides zooming, by magnifying in steps.
Synopsis
#include <qwt_magnifier.h>
Inherits QObject.
Inherited by QwtPlotMagnifier.
Public Member Functions
QwtMagnifier (QWidget *)
virtual ~QwtMagnifier ()
Destructor.
QWidget * parentWidget ()
const QWidget * parentWidget () const
void setEnabled (bool)
En/disable the magnifier.
bool isEnabled () const
void setMouseFactor (double)
Change the mouse factor.
double mouseFactor () const
void setMouseButton (Qt::MouseButton, Qt::KeyboardModifiers=Qt::NoModifier)
void getMouseButton (Qt::MouseButton &, Qt::KeyboardModifiers &) const
void setWheelFactor (double)
Change the wheel factor.
double wheelFactor () const
void setWheelModifiers (Qt::KeyboardModifiers)
Qt::KeyboardModifiers wheelModifiers () const
void setKeyFactor (double)
Change the key factor.
double keyFactor () const
void setZoomInKey (int key, Qt::KeyboardModifiers=Qt::NoModifier)
void getZoomInKey (int &key, Qt::KeyboardModifiers &) const
Retrieve the settings of the zoom in key.
void setZoomOutKey (int key, Qt::KeyboardModifiers=Qt::NoModifier)
void getZoomOutKey (int &key, Qt::KeyboardModifiers &) const
Retrieve the settings of the zoom out key.
virtual bool eventFilter (QObject *, QEvent *)
Event filter.
Protected Member Functions
virtual void rescale (double factor)=0
virtual void widgetMousePressEvent (QMouseEvent *)
virtual void widgetMouseReleaseEvent (QMouseEvent *)
virtual void widgetMouseMoveEvent (QMouseEvent *)
virtual void widgetWheelEvent (QWheelEvent *)
virtual void widgetKeyPressEvent (QKeyEvent *)
virtual void widgetKeyReleaseEvent (QKeyEvent *)
Detailed Description
QwtMagnifier provides zooming, by magnifying in steps.
Using QwtMagnifier a plot can be zoomed in/out in steps using keys, the mouse wheel or moving a mouse button in vertical direction.
Constructor & Destructor Documentation
QwtMagnifier::QwtMagnifier (QWidget * parent) [explicit]
Constructor
- Parameters
parent Widget to be magnified
Member Function Documentation
bool QwtMagnifier::eventFilter (QObject * object, QEvent * event) [virtual]
Event filter. When isEnabled() is true, the mouse events of the observed widget are filtered.
- Parameters
object Object to be filtered
event Event- Returns
Forwarded to QObject::eventFilter()
- See also
widgetMousePressEvent(), widgetMouseReleaseEvent(), widgetMouseMoveEvent(), widgetWheelEvent(), widgetKeyPressEvent() widgetKeyReleaseEvent()
void QwtMagnifier::getZoomInKey (int & key, Qt::KeyboardModifiers & modifiers) const
Retrieve the settings of the zoom in key.
- Parameters
key Key code, see Qt::Key
modifiers Keyboard modifiers- See also
setZoomInKey()
void QwtMagnifier::getZoomOutKey (int & key, Qt::KeyboardModifiers & modifiers) const
Retrieve the settings of the zoom out key.
- Parameters
key Key code, see Qt::Key
modifiers Keyboard modifiers- See also
setZoomOutKey()
bool QwtMagnifier::isEnabled () const
- Returns
true when enabled, false otherwise
- See also
setEnabled(), eventFilter()
double QwtMagnifier::keyFactor () const
- Returns
Key factor
- See also
setKeyFactor()
double QwtMagnifier::mouseFactor () const
- Returns
Mouse factor
- See also
setMouseFactor()
QWidget * QwtMagnifier::parentWidget ()
- Returns
Parent widget, where the rescaling happens
const QWidget * QwtMagnifier::parentWidget () const
- Returns
Parent widget, where the rescaling happens
virtual void QwtMagnifier::rescale (double factor) [protected], [pure virtual]
Rescale the parent widget
- Parameters
factor Scale factor
Implemented in QwtPlotMagnifier.
void QwtMagnifier::setEnabled (bool on)
En/disable the magnifier. 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 QwtMagnifier::setKeyFactor (double factor)
Change the key factor. The key factor defines the ratio between the current range on the parent widget and the zoomed range for each key press of the zoom in/out keys. The default value is 0.9.
- Parameters
factor Key factor
- See also
keyFactor(), setZoomInKey(), setZoomOutKey(), setWheelFactor, setMouseFactor()
void QwtMagnifier::setMouseFactor (double factor)
Change the mouse factor. The mouse factor defines the ratio between the current range on the parent widget and the zoomed range for each vertical mouse movement. The default value is 0.95.
- Parameters
factor Wheel factor
- See also
mouseFactor(), setMouseButton(), setWheelFactor(), setKeyFactor()
void QwtMagnifier::setWheelFactor (double factor)
Change the wheel factor. The wheel factor defines the ratio between the current range on the parent widget and the zoomed range for each step of the wheel.
Use values > 1 for magnification (i.e. 2.0) and values < 1 for scaling down (i.e. 1/2.0 = 0.5). You can use this feature for inverting the direction of the wheel.
The default value is 0.9.
- Parameters
factor Wheel factor
- See also
wheelFactor(), setWheelButtonState(), setMouseFactor(), setKeyFactor()
void QwtMagnifier::setWheelModifiers (Qt::KeyboardModifiers modifiers)
Assign keyboard modifiers for zooming in/out using the wheel. The default modifiers are Qt::NoModifiers.
- Parameters
modifiers Keyboard modifiers
- See also
wheelModifiers()
void QwtMagnifier::setZoomInKey (int key, Qt::KeyboardModifiers modifiers = Qt::NoModifier)
Assign the key, that is used for zooming in. The default combination is Qt::Key_Plus + Qt::NoModifier.
- Parameters
key
modifiers- See also
getZoomInKey(), setZoomOutKey()
void QwtMagnifier::setZoomOutKey (int key, Qt::KeyboardModifiers modifiers = Qt::NoModifier)
Assign the key, that is used for zooming out. The default combination is Qt::Key_Minus + Qt::NoModifier.
- Parameters
key
modifiers- See also
getZoomOutKey(), setZoomOutKey()
double QwtMagnifier::wheelFactor () const
- Returns
Wheel factor
- See also
setWheelFactor()
Qt::KeyboardModifiers QwtMagnifier::wheelModifiers () const
- Returns
Wheel modifiers
- See also
setWheelModifiers()
void QwtMagnifier::widgetKeyPressEvent (QKeyEvent * keyEvent) [protected], [virtual]
Handle a key press event for the observed widget.
- Parameters
keyEvent Key event
- See also
eventFilter(), widgetKeyReleaseEvent()
void QwtMagnifier::widgetKeyReleaseEvent (QKeyEvent * keyEvent) [protected], [virtual]
Handle a key release event for the observed widget.
- Parameters
keyEvent Key event
- See also
eventFilter(), widgetKeyReleaseEvent()
void QwtMagnifier::widgetMouseMoveEvent (QMouseEvent * mouseEvent) [protected], [virtual]
Handle a mouse move event for the observed widget.
- Parameters
mouseEvent Mouse event
- See also
eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(),
void QwtMagnifier::widgetMousePressEvent (QMouseEvent * mouseEvent) [protected], [virtual]
Handle a mouse press event for the observed widget.
- Parameters
mouseEvent Mouse event
- See also
eventFilter(), widgetMouseReleaseEvent(), widgetMouseMoveEvent()
void QwtMagnifier::widgetMouseReleaseEvent (QMouseEvent * mouseEvent) [protected], [virtual]
Handle a mouse release event for the observed widget.
- Parameters
mouseEvent Mouse event
- See also
eventFilter(), widgetMousePressEvent(), widgetMouseMoveEvent(),
void QwtMagnifier::widgetWheelEvent (QWheelEvent * wheelEvent) [protected], [virtual]
Handle a wheel event for the observed widget.
- Parameters
wheelEvent Wheel event
- See also
eventFilter()
Author
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