QwtMagnifier - QwtMagnifier provides zooming, by magnifying in steps.

NAME

QwtMagnifier − QwtMagnifier provides zooming, by magnifying in steps.

SYNOPSIS

#include <qwt_magnifier.h>

Inherits QObject.

Inherited by QwtPlotMagnifier, and QwtPolarMagnifier.

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 *) override
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.

Definition at line 27 of file qwt_magnifier.h.

Constructor & Destructor Documentation

QwtMagnifier::QwtMagnifier (QWidget * parent) [explicit]

Constructor

Parameters

parent Widget to be magnified

Definition at line 63 of file qwt_magnifier.cpp.

QwtMagnifier::˜QwtMagnifier () [virtual]

Destructor.

Definition at line 78 of file qwt_magnifier.cpp.

Member Function Documentation

bool QwtMagnifier::eventFilter (QObject * object, QEvent * event)[override], [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()

Definition at line 317 of file qwt_magnifier.cpp.

void QwtMagnifier::getMouseButton (Qt::MouseButton & button,Qt::KeyboardModifiers & modifiers) const

See also

setMouseButton()

Definition at line 210 of file qwt_magnifier.cpp.

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()

Definition at line 265 of file qwt_magnifier.cpp.

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()

Definition at line 295 of file qwt_magnifier.cpp.

bool QwtMagnifier::isEnabled () const

Returns

true when enabled, false otherwise

See also

setEnabled(), eventFilter()

Definition at line 113 of file qwt_magnifier.cpp.

double QwtMagnifier::keyFactor () const

Returns

Key factor

See also

setKeyFactor()

Definition at line 237 of file qwt_magnifier.cpp.

double QwtMagnifier::mouseFactor () const

Returns

Mouse factor

See also

setMouseFactor()

Definition at line 188 of file qwt_magnifier.cpp.

QWidget * QwtMagnifier::parentWidget ()

Returns

Parent widget, where the rescaling happens

Definition at line 499 of file qwt_magnifier.cpp.

const QWidget * QwtMagnifier::parentWidget () const

Returns

Parent widget, where the rescaling happens

Definition at line 505 of file qwt_magnifier.cpp.

virtual void QwtMagnifier::rescale (double factor) [protected], [purevirtual]

Rescale the parent widget

Parameters

factor Scale factor

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()

Definition at line 92 of file qwt_magnifier.cpp.

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()

Definition at line 228 of file qwt_magnifier.cpp.

void QwtMagnifier::setMouseButton (Qt::MouseButton button,Qt::KeyboardModifiers modifiers = Qt::NoModifier)

Assign the mouse button, that is used for zooming in/out. The default value is Qt::RightButton.

Parameters

button Button
modifiers Keyboard modifiers

See also

getMouseButton()

Definition at line 202 of file qwt_magnifier.cpp.

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()

Definition at line 179 of file qwt_magnifier.cpp.

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()

Definition at line 134 of file qwt_magnifier.cpp.

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()

Definition at line 155 of file qwt_magnifier.cpp.

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()

Definition at line 250 of file qwt_magnifier.cpp.

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()

Definition at line 280 of file qwt_magnifier.cpp.

double QwtMagnifier::wheelFactor () const

Returns

Wheel factor

See also

setWheelFactor()

Definition at line 143 of file qwt_magnifier.cpp.

Qt::KeyboardModifiers QwtMagnifier::wheelModifiers () const

Returns

Wheel modifiers

See also

setWheelModifiers()

Definition at line 164 of file qwt_magnifier.cpp.

void QwtMagnifier::widgetKeyPressEvent (QKeyEvent * keyEvent) [protected],[virtual]

Handle a key press event for the observed widget.

Parameters

keyEvent Key event

See also

eventFilter(), widgetKeyReleaseEvent()

Reimplemented in QwtPolarMagnifier.

Definition at line 473 of file qwt_magnifier.cpp.

void QwtMagnifier::widgetKeyReleaseEvent (QKeyEvent * keyEvent)[protected], [virtual]

Handle a key release event for the observed widget.

Parameters

keyEvent Key event

See also

eventFilter(), widgetKeyReleaseEvent()

Definition at line 493 of file qwt_magnifier.cpp.

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(),

Definition at line 407 of file qwt_magnifier.cpp.

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()

Definition at line 365 of file qwt_magnifier.cpp.

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(),

Definition at line 390 of file qwt_magnifier.cpp.

void QwtMagnifier::widgetWheelEvent (QWheelEvent * wheelEvent) [protected],[virtual]

Handle a wheel event for the observed widget.

Parameters

wheelEvent Wheel event

See also

eventFilter()

Definition at line 431 of file qwt_magnifier.cpp.

Author

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Updated 2026-06-01 - jenkler.se | uex.se