QwtMagnifier(3) Qwt User's Guide QwtMagnifier(3) NAME QwtMagnifier - QwtMagnifier provides zooming, by magnifying in steps. SYNOPSIS #include 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. 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], [pure virtual] 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 Generated automatically by Doxygen for Qwt User's Guide from the source code. Version 6.2.0 Sun Jul 18 2021 QwtMagnifier(3)