QwtMagnifier - Man Page

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.

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 *)

Constructor

Parameters

parent Widget to be magnified

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()

See also

setMouseButton()

Retrieve the settings of the zoom in key.

Parameters

key Key code, see Qt::Key
modifiers Keyboard modifiers

See also

setZoomInKey()

Retrieve the settings of the zoom out key.

Parameters

key Key code, see Qt::Key
modifiers Keyboard modifiers

See also

setZoomOutKey()

Returns

true when enabled, false otherwise

See also

setEnabled(), eventFilter()

Returns

Key factor

See also

setKeyFactor()

Returns

Mouse factor

See also

setMouseFactor()

Returns

Parent widget, where the rescaling happens

Returns

Parent widget, where the rescaling happens

Rescale the parent widget

Parameters

factor Scale factor

Implemented in QwtPlotMagnifier.

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()

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()

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()

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()

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()

Assign keyboard modifiers for zooming in/out using the wheel. The default modifiers are Qt::NoModifiers.

Parameters

modifiers Keyboard modifiers

See also

wheelModifiers()

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()

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()

Returns

Wheel factor

See also

setWheelFactor()

Returns

Wheel modifiers

See also

setWheelModifiers()

Handle a key press event for the observed widget.

Parameters

keyEvent Key event

See also

eventFilter(), widgetKeyReleaseEvent()

Handle a key release event for the observed widget.

Parameters

keyEvent Key event

See also

eventFilter(), widgetKeyReleaseEvent()

Handle a mouse move event for the observed widget.

Parameters

mouseEvent Mouse event

See also

eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(),

Handle a mouse press event for the observed widget.

Parameters

mouseEvent Mouse event

See also

eventFilter(), widgetMouseReleaseEvent(), widgetMouseMoveEvent()

Handle a mouse release event for the observed widget.

Parameters

mouseEvent Mouse event

See also

eventFilter(), widgetMousePressEvent(), widgetMouseMoveEvent(),

Handle a wheel event for the observed widget.

Parameters

wheelEvent Wheel event

See also

eventFilter()