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java.lang.Objectcom.trolltech.qt.QSignalEmitter
com.trolltech.qt.QtJambiObject
com.trolltech.qt.core.QEvent
com.trolltech.qt.gui.QInputEvent
com.trolltech.qt.gui.QWheelEvent
public class QWheelEvent
The QWheelEvent class contains parameters that describe a wheel event.
Wheel events are sent to the widget under the mouse cursor, but if that widget does not handle the event they are sent to the focus widget. The rotation distance is provided by delta. The functions pos and globalPos return the mouse cursor's location at the time of the event.
A wheel event contains a special accept flag that indicates whether the receiver wants the event. You should call ignore if you do not handle the wheel event; this ensures that it will be sent to the parent widget.
The QWidget::setEnabled() function can be used to enable or disable mouse and keyboard events for a widget.
The event handler QWidget::wheelEvent() receives wheel events.
Nested Class Summary |
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Nested classes/interfaces inherited from class com.trolltech.qt.core.QEvent |
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QEvent.Type |
Nested classes/interfaces inherited from class com.trolltech.qt.QSignalEmitter |
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QSignalEmitter.Signal0, QSignalEmitter.Signal1<A>, QSignalEmitter.Signal2<A,B>, QSignalEmitter.Signal3<A,B,C>, QSignalEmitter.Signal4<A,B,C,D>, QSignalEmitter.Signal5<A,B,C,D,E>, QSignalEmitter.Signal6<A,B,C,D,E,F>, QSignalEmitter.Signal7<A,B,C,D,E,F,G>, QSignalEmitter.Signal8<A,B,C,D,E,F,G,H>, QSignalEmitter.Signal9<A,B,C,D,E,F,G,H,I> |
Constructor Summary | |
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QWheelEvent(QPoint pos,
int delta,
Qt.MouseButtons buttons,
Qt.KeyboardModifiers modifiers)
Equivalent to QWheelEvent(pos, delta, buttons, modifiers, Qt::Vertical). |
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QWheelEvent(QPoint pos,
int delta,
Qt.MouseButtons buttons,
Qt.KeyboardModifiers modifiers,
Qt.Orientation orient)
Constructs a wheel event object. |
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QWheelEvent(QPoint pos,
QPoint globalPos,
int delta,
Qt.MouseButtons buttons,
Qt.KeyboardModifiers modifiers)
Equivalent to QWheelEvent(pos, globalPos, delta, buttons, modifiers, Qt::Vertical). |
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QWheelEvent(QPoint pos,
QPoint globalPos,
int delta,
Qt.MouseButtons buttons,
Qt.KeyboardModifiers modifiers,
Qt.Orientation orient)
Constructs a wheel event object. |
Method Summary | |
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Qt.MouseButtons |
buttons()
Returns the mouse state when the event occurred. |
int |
delta()
Returns the distance that the wheel is rotated, in eighths of a degree. |
static QWheelEvent |
fromNativePointer(QNativePointer nativePointer)
This function returns the QWheelEvent instance pointed to by nativePointer |
QPoint |
globalPos()
Returns the global position of the mouse pointer at the time of the event. |
int |
globalX()
Returns the global x position of the mouse cursor at the time of the event. |
int |
globalY()
Returns the global y position of the mouse cursor at the time of the event. |
Qt.Orientation |
orientation()
Returns the wheel's orientation. |
QPoint |
pos()
Returns the position of the mouse cursor relative to the widget that received the event. |
protected void |
setMouseState(Qt.MouseButton... mouseState)
Sets the mouse button state of this QWheelEvent to mouseState. |
int |
x()
Returns the x position of the mouse cursor, relative to the widget that received the event. |
int |
y()
Returns the y position of the mouse cursor, relative to the widget that received the event. |
Methods inherited from class com.trolltech.qt.gui.QInputEvent |
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modifiers, setModState |
Methods inherited from class com.trolltech.qt.core.QEvent |
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accept, ignore, isAccepted, setAccepted, setT, spontaneous, t, type |
Methods inherited from class com.trolltech.qt.QtJambiObject |
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dispose, disposed, finalize, reassignNativeResources, tr, tr, tr |
Methods inherited from class com.trolltech.qt.QSignalEmitter |
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blockSignals, disconnect, disconnect, signalsBlocked, signalSender, thread |
Methods inherited from class java.lang.Object |
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clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface com.trolltech.qt.QtJambiInterface |
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disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership |
Constructor Detail |
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public QWheelEvent(QPoint pos, int delta, Qt.MouseButtons buttons, Qt.KeyboardModifiers modifiers)
Equivalent to QWheelEvent(pos, delta, buttons, modifiers, Qt::Vertical).
public QWheelEvent(QPoint pos, int delta, Qt.MouseButtons buttons, Qt.KeyboardModifiers modifiers, Qt.Orientation orient)
Constructs a wheel event object.
The position, pos, is the location of the mouse cursor within the widget. The globalPos is initialized to QCursor::pos() which is usually, but not always, correct. Use the other constructor if you need to specify the global position explicitly.
The buttons describe the state of the mouse buttons at the time of the event, delta contains the rotation distance, modifiers holds the keyboard modifier flags at the time of the event, and orient holds the wheel's orientation.
public QWheelEvent(QPoint pos, QPoint globalPos, int delta, Qt.MouseButtons buttons, Qt.KeyboardModifiers modifiers)
Equivalent to QWheelEvent(pos, globalPos, delta, buttons, modifiers, Qt::Vertical).
public QWheelEvent(QPoint pos, QPoint globalPos, int delta, Qt.MouseButtons buttons, Qt.KeyboardModifiers modifiers, Qt.Orientation orient)
Constructs a wheel event object.
The pos provides the location of the mouse cursor within the widget. The position in global coordinates is specified by globalPos. delta contains the rotation distance, modifiers holds the keyboard modifier flags at the time of the event, and orient holds the wheel's orientation.
Method Detail |
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public final Qt.MouseButtons buttons()
Returns the mouse state when the event occurred.
public final int delta()
Returns the distance that the wheel is rotated, in eighths of a degree. A positive value indicates that the wheel was rotated forwards away from the user; a negative value indicates that the wheel was rotated backwards toward the user.
Most mouse types work in steps of 15 degrees, in which case the delta value is a multiple of 120; i.e., 120 * 1/8 = 15.
Example:
void MyWidget::wheelEvent(QWheelEvent *event) { int numDegrees = event->delta() / 8; int numSteps = numDegrees / 15; if (event->orientation() == Qt::Horizontal) { scrollHorizontally(numSteps); } else { scrollVertically(numSteps); } }
public final QPoint globalPos()
Returns the global position of the mouse pointer at the time of the event. This is important on asynchronous window systems such as X11; whenever you move your widgets around in response to mouse events, globalPos can differ a lot from the current cursor position returned by QCursor::pos().
public final int globalX()
Returns the global x position of the mouse cursor at the time of the event.
public final int globalY()
Returns the global y position of the mouse cursor at the time of the event.
public final Qt.Orientation orientation()
Returns the wheel's orientation.
public final QPoint pos()
Returns the position of the mouse cursor relative to the widget that received the event.
If you move your widgets around in response to mouse events, use globalPos instead of this function.
public final int x()
Returns the x position of the mouse cursor, relative to the widget that received the event.
public final int y()
Returns the y position of the mouse cursor, relative to the widget that received the event.
protected final void setMouseState(Qt.MouseButton... mouseState)
public static QWheelEvent fromNativePointer(QNativePointer nativePointer)
nativePointer
- the QNativePointer of which object should be returned.
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