|
|
The QMouseEvent class contains parameters that describe a mouse event. More...
#include <qevent.h>
Inherits QEvent.
Mouse events occur when a mouse button is pressed or released inside a widget, or when the mouse cursor is moved.
Mouse move events will only occur when some mouse button is pressed down, unless mouse tracking has been enabled with QWidget::setMouseTracking().
Qt automatically grabs the mouse when a mouse button is pressed inside a widget, and the widget will continue to receive mouse events until the last mouse button is released.
The functions pos(), x() and y() give the cursor position relative to the widget that receives the mouse event. If you move the widget as a result of the mouse event, use the global position returned by globalPos() to avoid a shaking motion.
The QWidget::setEnable() function can be used to enable or disable mouse and keyboard events for a widget.
The event handlers QWidget::mousePressEvent(), QWidget::mouseReleaseEvent(), QWidget::mouseDoubleClickEvent() and QWidget::mouseMoveEvent() receive mouse events.
See also QWidget::setMouseTracking(), QWidget::grabMouse() and QCursor::pos().
Examples: qtimage/qtimage.cpp drawlines/connect.cpp popup/popup.cpp qmag/qmag.cpp scrollview/scrollview.cpp trivial/trivial.cpp movies/main.cpp
Constructs a mouse event object.
The type parameter must be QEvent::MouseButtonPress, QEvent::MouseButtonRelease, QEvent::MouseButtonDblClick or QEvent::MouseMove.
The pos parameter specifies the position relative to the
receiving widget; globalPos is the position in absolute
coordinates; button specifies the ButtonState of the button that
caused the event, which should be 0 if type is MouseMove; and
state is the ButtonState at the time of the event.
Constructs a mouse event object.
The type parameter must be one of QEvent::MouseButtonPress, QEvent::MouseButtonRelease, QEvent::MouseButtonDblClick or QEvent::MouseMove.
The pos parameter specifies the position relative to the
receiving widget; button specifies the ButtonState of the button
that caused the event, which should be 0 if type is MouseMove; state is the ButtonState at the time of the event.
The globalPos() is initialized to QCursor::pos(), which may not be appropriate. Use the other constructor to specify the global position explicitly.
Returns the button that caused the event.
Possible return values are LeftButton, RightButton, MidButton and
NoButton.
Note that the returned value is always NoButton (0) for mouse move
events.
See also state().
Examples: movies/main.cpp
Returns the global position of the mouse pointer at the time of the event. This is important on asynchronous window systems
like X11: Whenever you move your widgets around in response to mouse
evens, globalPos() can differ a lot from the current pointer
position QCursor::pos(), and from
QWidget::mapToGlobal( pos() ) .
See also globalX() and globalY().
Returns the global X position of the mouse pointer at the time of the event
See also globalY() and globalPos().
Returns the global Y position of the mouse pointer at the time of the event
See also globalX() and globalPos().
Returns the position of the mouse pointer, relative to the widget that received the event.
If you move the widget as a result of the mouse event, use the global position returned by globalPos() to avoid a shaking motion.
See also x(), y() and globalPos().
Examples: qtimage/qtimage.cpp drawlines/connect.cpp qmag/qmag.cpp
Returns the button state (a combination of mouse buttons and keyboard modifiers), i.e. what buttons and keys were being held depressed immediately before the event was generated.
Note that this means that for QEvent::MouseButtonPress and QEvent::MouseButtonDblClick, the flag for the button() itself will not be
set in the state; while for QEvent::MouseButtonRelease, it will.
This value is mainly interesting for QEvent::MouseMove, for the
other cases, button() is more useful.
The returned value is LeftButton, RightButton, MidButton, ShiftButton, ControlButton and AltButton OR'ed together.
See also button() and stateAfter().
Examples: movies/main.cpp
Returns the state of buttons after the event.
See also state().
Returns the X position of the mouse pointer, relative to the widget that received the event.
Examples: scrollview/scrollview.cpp
Returns the Y position of the mouse pointer, relative to the widget that received the event.
Examples: scrollview/scrollview.cpp
Search the documentation, FAQ, qt-interest archive and more (uses
www.trolltech.com):
This file is part of the Qt toolkit, copyright © 1995-2000 Trolltech, all rights reserved.
| Copyright © 2000 Trolltech | Trademarks | Qt version 2.2.1
|
