qwtpicker(3)

NAME

QwtPicker

SYNOPSIS

Inherits QwtEventPattern.
Inherited by QwtPlotPicker.

Detailed Description

QwtPicker provides selections on a widget.

QwtPicker filters all mouse and keyboard events of a widget and
translates them into an array of selected points. Depending on the
QwtPicker::SelectionType the selection might be a single point, a rectangle or a polygon. The selection process is supported by optional rubberbands (rubberband selection) and position labels.

QwtPicker is useful for widgets where the event handlers can´t be
overloaded, like for components of composite widgets. It offers
alternative handlers for mouse and key events.

Example .RS 4
#include <qwt_picker.h>
QwtPicker *picker = new QwtPicker(widget);
picker->setCursorLabelMode(QwtPicker::ActiveOnly);
connect(picker, SIGNAL(selected(const QPointArray &)), ...);
// emit the position of clicks on widget
picker->setSelectionFlags(QwtPicker::PointSelection | QwtPicker::ClickSelection);

...
// now select rectangles
picker->setSelectionFlags(QwtPicker::RectSelection | QwtPicker::DragSelection);
picker->setRubberBand(QwtPicker::RectRubberBand);
The selection process uses the commands begin(), append(), move() and end().
append() adds a new point to the selection, move() changes the position of the
latest point.
The commands are initiated from a small state machine (QwtPickerMachine) that
translates mouse and key events. There are a couple of predefined state
machines for point, rect and polygon selections. The selectionFlags() control
which one should be used. It is possible to use other machines by overloading
stateMachine().
The picker is active (isActive()), between begin() and end(). In active state
the rubberband is displayed, and the cursor label is visible in case of
cursorLabelMode is ActiveOnly or AlwaysOn.
The cursor can be moved using the arrow keys. All selections can be aborted
using the abort key. (QwtEventPattern::KeyPatternCode)

Warning:

In case of QWidget::NoFocus the focus policy of the observed widget is set to QWidget::WheelFocus and mouse tracking will be manipulated for
ClickSelection while the picker is active, or if cursorLabelMode() is AlwayOn.
Definition at line 79 of file qwt_picker.h.
Public Types
enum SelectionType { NoSelection = 0, PointSelection = 1,
RectSelection = 2, PolygonSelection = 4 }
enum RectSelectionType { CornerToCorner = 64, CenterToCorner = 128,
CenterToRadius = 256 }
enum SelectionMode { ClickSelection = 1024, DragSelection = 2048 } enum RubberBand { NoRubberBand = 0, HLineRubberBand, VLineRubberBand,
CrossRubberBand, RectRubberBand, EllipseRubberBand, PolygonRubberBand, UserRubberBand = 100 }
enum DisplayMode { AlwaysOff, AlwaysOn, ActiveOnly } enum ResizeMode { Stretch, KeepSize }
Signals
void selected (const QPointArray &pa)
void appended (const QPoint &pos)
void moved (const QPoint &pos)
void changed (const QPointArray &pa)
Public Member Functions
QwtPicker (QWidget *, const char *name=0)
QwtPicker (int selectionFlags, RubberBand rubberBand, DisplayMode
cursorLabelMode, QWidget *, const char *name=0)
virtual ~QwtPicker ()
virtual void setSelectionFlags (int) int selectionFlags () const
virtual void setRubberBand (RubberBand) RubberBand rubberBand () const virtual void setCursorLabelMode (DisplayMode) DisplayMode cursorLabelMode () const virtual void setResizeMode (ResizeMode) ResizeMode resizeMode () const virtual void setRubberBandPen (const QPen &) QPen rubberBandPen () const
virtual void setCursorLabelPen (const QPen &) QPen cursorLabelPen () const
virtual void setCursorLabelFont (const QFont &) QFont cursorLabelFont () const
bool isEnabled () const
virtual void setEnabled (bool)
bool isActive () const
virtual bool eventFilter (QObject *, QEvent *)
QWidget * parentWidget ()
const QWidget * parentWidget () const
virtual QRect pickRect () const
const QPointArray & selection () const
virtual bool event (QEvent *)
Protected Member Functions
virtual bool accept (QPointArray &selection) const
virtual void transition (const QEvent *)
virtual void begin ()
virtual void append (const QPoint &)
virtual void move (const QPoint &)
virtual bool end (bool ok=TRUE)
virtual void widgetMousePressEvent (QMouseEvent *) virtual void widgetMouseReleaseEvent (QMouseEvent *) virtual void widgetMouseDoubleClickEvent (QMouseEvent *) virtual void widgetMouseMoveEvent (QMouseEvent *) virtual void widgetWheelEvent (QWheelEvent *) virtual void widgetKeyPressEvent (QKeyEvent *) virtual void widgetKeyReleaseEvent (QKeyEvent *) virtual void drawRubberBand (const QRect &clipRect=QRect()) const virtual void drawRubberBand (QPainter *, const QRect &rect, const
QPointArray &) const
virtual void drawCursorLabel (const QRect &clipRect=QRect()) const virtual void drawCursorLabel (QPainter *, const QRect &rect, const
QPoint &, const QPointArray &) const
virtual void stretchSelection (const QSize &oldSize, const QSize
&newSize)
virtual QString cursorLabel (const QPoint &pos) const virtual QwtPickerMachine * stateMachine (int) const void repaint (const QRect &rect=QRect())

Member Enumeration Documentation

enum QwtPicker::DisplayMode
· AlwaysOff
Display never.
· AlwaysOn
Display always.
· ActiveOnly
Display only when the selection is active.
See also:
QwtPicker::setCursorLabelMode(), QwtPicker::cursorLabelMode(), QwtPicker::isActive()
Definition at line 223 of file qwt_picker.h.
Referenced by cursorLabelMode().
enum QwtPicker::RectSelectionType
Selection subtype for RectSelection This enum type describes the type
of rectangle selections. It can be or´d with
QwtPicker::RectSelectionType and QwtPicker::SelectionMode and passed to QwtPicker::setSelectionFlags().
· CornerToCorner
The first and the second selected point are the corners of the
rectangle.
· CenterToCorner
The first point is the center, the second a corner of the rectangle.
· CenterToRadius
The first point is the center of a quadrat, calculated by the
maximum of the x- and y-distance.
The default value is CornerToCorner.
See also:
QwtPicker::setSelectionFlags(), QwtPicker::selectionFlags()
Definition at line 149 of file qwt_picker.h.
enum QwtPicker::ResizeMode
Controls what to do with the selected points of an active selection
when the observed widget is resized.
· Stretch
All points are scaled according to the new size,
· KeepSize
All points remain unchanged.
The default value is Stretch.
See also:
QwtPicker::setResizeMode(), QwtPicker::resize()
Definition at line 242 of file qwt_picker.h.
Referenced by resizeMode().
enum QwtPicker::RubberBand
Rubberband style
· NoRubberBand
No rubberband.
· HLineRubberBand & PointSelection
A horizontal line.
· VLineRubberBand & PointSelection
A vertical line.
· CrossRubberBand & PointSelection
A horizontal and a vertical line.
· RectRubberBand & RectSelection
A rectangle.
· EllipseRubberBand & RectSelection
An ellipse.
· PolygonRubberBand &PolygonSelection
A polygon.
· UserRubberBand
Values >= UserRubberBand can be used to define additional rubber
bands.
The default value is NoRubberBand.
See also:
QwtPicker::setRubberBand(), QwtPicker::rubberBand()
Definition at line 193 of file qwt_picker.h.
Referenced by rubberBand().
enum QwtPicker::SelectionMode
Values of this enum type or´d together with a SelectionType value
identifies which state machine should be used for the selection.
The default value is ClickSelection.
See also:
stateMachine()
Definition at line 163 of file qwt_picker.h.
enum QwtPicker::SelectionType
This enum type describes the type of a selection. It can be or´d with QwtPicker::RectSelectionType and QwtPicker::SelectionMode and passed to QwtPicker::setSelectionFlags()
· NoSelection
Selection is disabled. Note this is different to the disabled state,
as you might have a cursor label.
· PointSelection
Select a single point.
· RectSelection
Select a rectangle.
· PolygonSelection
Select a polygon.
The default value is NoSelection.
See also:
QwtPicker::setSelectionFlags(), QwtPicker::selectionFlags()
Definition at line 123 of file qwt_picker.h.

Constructor & Destructor Documentation

QwtPicker::QwtPicker (QWidget * parent, const char * name = 0)
Constructor
Creates an picker that is enabled, but where selection flags s set to
NoSelection, rubberband and cursor label are disabled.
Parameters:
parent Parent widget, that will be observed
name Object name
Definition at line 30 of file qwt_picker.cpp.
QwtPicker::QwtPicker (int selectionFlags, RubberBand rubberBand,
DisplayMode cursorLabelMode, QWidget * parent, const char * name = 0) Constructor
Parameters:
selectionFlags Or´d value of SelectionType, RectSelectionType and SelectionMode
rubberBand Rubberband style
cursorLabelMode Cursor label mode
parent Parent widget, that will be observed
name Object name
Definition at line 46 of file qwt_picker.cpp.
QwtPicker::~QwtPicker () [virtual]
Destructor.
Definition at line 54 of file qwt_picker.cpp.

Member Function Documentation

bool QwtPicker::accept (QPointArray & selection) const [protected, virtual]
Validate and fixup the selection.
Accepts all selections unmodified
Parameters:
selection Selection to validate and fixup
Returns:
TRUE, when accepted, FALSE otherwise
Reimplemented in QwtPlotZoomer.
Definition at line 1124 of file qwt_picker.cpp.
Referenced by end().
void QwtPicker::append (const QPoint & pos) [protected, virtual]
Append a point to the selection and update rubberband and cursor label. The appended() signal is emitted.
Parameters:
pos Additional point
See also:
isActive, begin(), end(), move(), appended()
Reimplemented in QwtPlotPicker.
Definition at line 1082 of file qwt_picker.cpp.
References appended(), drawCursorLabel(), and drawRubberBand().
Referenced by QwtPlotPicker::append(), and transition().
void QwtPicker::appended (const QPoint & pos) [signal]
A signal emitted when a point has been appended to the selection
Parameters:
pos Position of the appended point.
See also:
append(). moved()
Referenced by append().
void QwtPicker::begin () [protected, virtual]
Open a selection setting the state to active
See also:
isActive, end(), append(), move()
Reimplemented in QwtPlotZoomer.
Definition at line 1013 of file qwt_picker.cpp.
References cursorLabelMode(), drawCursorLabel(), and parentWidget().
Referenced by QwtPlotZoomer::begin(), and transition().
void QwtPicker::changed (const QPointArray & pa) [signal]
A signal emitted when the active selection has been changed. This might happen when the observed widget is resized.
Parameters:
pa Changed selection
See also:
stretchSelection()
Referenced by stretchSelection().
QString QwtPicker::cursorLabel (const QPoint & pos) const [protected,
virtual]
Return the label for a position.
In case of HLineRubberBand the label is the value of the y position, in case of VLineRubberBand the value of the x position. Otherwise the
label contains x and y position separated by a ´, ´.
The format for the string conversion is '%d'.
Parameters:
pos Position
Returns:
Converted position as string
Reimplemented in QwtPlotPicker.
Definition at line 408 of file qwt_picker.cpp.
References rubberBand().
Referenced by drawCursorLabel().
QFont QwtPicker::cursorLabelFont () const
Returns:
Cursor label font
See also:
setCursorLabelFont(), cursorLabelMode(), cursorLabelPen()
Definition at line 336 of file qwt_picker.cpp.
QwtPicker::DisplayMode QwtPicker::cursorLabelMode () const
Returns:
Cursor label display mode
See also:
setCursorLabelMode(), DisplayMode
Definition at line 240 of file qwt_picker.cpp.
References DisplayMode.
Referenced by begin(), drawCursorLabel(), and end().
QPen QwtPicker::cursorLabelPen () const
Returns:
Cursor label pen
See also:
setCursorLabelPen(), cursorLabelMode(), cursorLabelFont()
Definition at line 365 of file qwt_picker.cpp.
void QwtPicker::drawCursorLabel (QPainter * painter, const QRect &
pickRect, const QPoint & pos, const QPointArray & pa) const [protected, virtual]
Draw a cursor label.
The default position of the label is top-right of the cursor. In case
of a rubberband the label is placed not to conflict with the
rubberband.
Parameters:
painter Painter, initialized with clip rect, in Qt::XorROP mode of cursor label pen and background color of the observed widget.
pickRect Rectangle where selections can happen.
pos Cursor position
pa Current selection
See also:
rubberBand(), RubberBand, selectionFlags()
Definition at line 627 of file qwt_picker.cpp.
References QwtText::boundingRect(), cursorLabel(), QwtText::draw(),
isActive(), QwtText::makeText(), and rubberBand().
void QwtPicker::drawCursorLabel (const QRect & clipRect = QRect()) const
[protected, virtual]
Draw the cursor label.
The cursor label is painted in Qt::XorROP mode, what means the first
call paints the second erases the painted rubberband.
Parameters:
clipRect Clipping rectangle. If it is now valid the result of pickRect() is used instead.
See also:
pickRect(), QPainter::setRasterOp(), QPainter::setClipRect()
Definition at line 580 of file qwt_picker.cpp.
References cursorLabelMode(), isActive(), parentWidget(), and
pickRect().
Referenced by append(), begin(), end(), event(), eventFilter(),
setCursorLabelFont(), setCursorLabelPen(), setEnabled(),
widgetMouseMoveEvent(), and widgetWheelEvent().
void QwtPicker::drawRubberBand (QPainter * painter, const QRect & pickRect,
const QPointArray & pa) const [protected, virtual] Draw a rubberband , depending on rubberBand() and selectionFlags()
Parameters:
painter Painter, initialized with clip rect, in Qt::XorROP mode of rubberband pen and background color of the observed widget.
pickRect Rectangle where selection can happen.
pa Current selection
See also:
rubberBand(), RubberBand, selectionFlags()
Definition at line 472 of file qwt_picker.cpp.
References QwtPainter::drawEllipse(), QwtPainter::drawLine(),
QwtPainter::drawRect(), rubberBand(), and selectionFlags().
void QwtPicker::drawRubberBand (const QRect & clipRect = QRect()) const
[protected, virtual]
Draw the rubberband.
The rubberband is painted in Qt::XorROP mode, what means the first call paints the second erases the painted rubberband.
Parameters:
clipRect Clipping rectangle. If it is now valid the result of pickRect() is used instead.
See also:
pickRect(), QPainter::setRasterOp(), QPainter::setClipRect()
Definition at line 437 of file qwt_picker.cpp.
References isActive(), parentWidget(), pickRect(), rubberBand(), and
rubberBandPen().
Referenced by append(), end(), event(), eventFilter(), move(), and
setRubberBandPen().
bool QwtPicker::end (bool ok = TRUE) [protected, virtual]
Close a selection setting the state to inactive.
The selection is validated and maybe fixed by QwtPicker::accept().
Parameters:
ok If TRUE, complete the selection and emit a selected signal
otherwise discard the selection.
Returns:
TRUE if the selection is accepted, FALSE otherwise
See also:
isActive, begin(), append(), move(), selected(), accept()
Reimplemented in QwtPlotPicker, and QwtPlotZoomer.
Definition at line 1044 of file qwt_picker.cpp.
References accept(), cursorLabelMode(), drawCursorLabel(),
drawRubberBand(), and selected().
Referenced by QwtPlotPicker::end(), transition(), and
widgetKeyPressEvent().
bool QwtPicker::event (QEvent * e) [virtual]
Event Handler.
Paint events for the observed widgets require to repaint rubberband an cursor label too. To delay them until the widget is repainted the event filter sends a QEvent::Paint to the picker, that is handled here.
See also:
repaint, eventFilter(), drawRubberBand(), drawCursorLabel()
Definition at line 702 of file qwt_picker.cpp.
References drawCursorLabel(), and drawRubberBand().
bool QwtPicker::eventFilter (QObject * o, QEvent * e) [virtual]
Event filter.
When isEnabled() == TRUE all events of the observed widget are filtered. Mouse and keyboard events are translated into widgetMouseand widgetKey- and widgetWheel-events. Paint and Resize events are
handled to keep rubberband and cursor label up to date.
See also:
event(), widgetMousePressEvent(), widgetMouseReleaseEvent(), widgetMouseDoubleClickEvent(), widgetMouseMoveEvent(), widgetWheelEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent()
Definition at line 728 of file qwt_picker.cpp.
References drawCursorLabel(), drawRubberBand(), parentWidget(),
repaint(), stretchSelection(), widgetKeyPressEvent(),
widgetKeyReleaseEvent(), widgetMouseDoubleClickEvent(),
widgetMouseMoveEvent(), widgetMousePressEvent(),
widgetMouseReleaseEvent(), and widgetWheelEvent().
bool QwtPicker::isActive () const
A picker is active between begin() and end().
Returns:
TRUE if the selection is active.
Definition at line 1133 of file qwt_picker.cpp.
Referenced by drawCursorLabel(), drawRubberBand(),
QwtPlotZoomer::widgetKeyPressEvent(), and widgetKeyPressEvent().
bool QwtPicker::isEnabled () const
Returns:
TRUE when enabled, FALSE otherwise
See also:
setEnabled, eventFilter()
Definition at line 306 of file qwt_picker.cpp.
Referenced by setCursorLabelFont(), and setCursorLabelPen().
void QwtPicker::move (const QPoint & pos) [protected, virtual]
Move the last point of the selection The moved() signal is emitted.
Parameters:
pos New position
See also:
isActive, begin(), end(), append()
Reimplemented in QwtPlotPicker.
Definition at line 1108 of file qwt_picker.cpp.
References drawRubberBand(), and moved().
Referenced by QwtPlotPicker::move(), and transition().
void QwtPicker::moved (const QPoint & pos) [signal]
A signal emitted whenever the last appended point of the selection has been moved.
Parameters:
pos Position of the moved last point of the selection.
See also:
move(), appended()
Referenced by move().
const QWidget * QwtPicker::parentWidget () const
Return the parent widget, where the selection happens.
Definition at line 155 of file qwt_picker.cpp.
QWidget * QwtPicker::parentWidget ()
Return the parent widget, where the selection happens.
Definition at line 145 of file qwt_picker.cpp.
Referenced by begin(), QwtPlotPicker::canvas(), drawCursorLabel(),
drawRubberBand(), eventFilter(), pickRect(), setEnabled(),
transition(), and widgetKeyPressEvent().
QRect QwtPicker::pickRect () const [virtual]
Find the area of the observed widget, where selection might happen.
Returns:
QFrame::contentsRect() if it is a QFrame, QWidget::rect()
otherwise.
Definition at line 1205 of file qwt_picker.cpp.
References parentWidget().
Referenced by drawCursorLabel(), drawRubberBand(),
widgetKeyPressEvent(), widgetMouseMoveEvent(), and widgetWheelEvent().
void QwtPicker::repaint (const QRect & rect = QRect()) [protected]
Repaint cursor label and rubberband on top of the widget.
Send a QEvent::Paint event to the picker
Parameters:
rect Rectangle which has to be repainted. In case of
!rect.isValid() a complete repaint ill be initiated.
Definition at line 687 of file qwt_picker.cpp.
Referenced by eventFilter().
QwtPicker::ResizeMode QwtPicker::resizeMode () const
Returns:
Resize mode
See also:
setResizeMode(), ResizeMode
Definition at line 269 of file qwt_picker.cpp.
References ResizeMode.
QwtPicker::RubberBand QwtPicker::rubberBand () const
Returns:
Rubberband style
See also:
setRubberBand(), RubberBand, rubberBandPen()
Definition at line 206 of file qwt_picker.cpp.
References RubberBand.
Referenced by QwtPlotPicker::cursorLabel(), cursorLabel(),
drawCursorLabel(), and drawRubberBand().
QPen QwtPicker::rubberBandPen () const
Returns:
Rubberband pen
See also:
setRubberBandPen(), rubberBand()
Definition at line 390 of file qwt_picker.cpp.
Referenced by drawRubberBand().
void QwtPicker::selected (const QPointArray & pa) [signal]
A signal emitting the selected points, at the end of a selection.
Parameters:
pa Selected points
Referenced by end().
const QPointArray & QwtPicker::selection () const
Return Selected points.
Definition at line 1139 of file qwt_picker.cpp.
Referenced by QwtPlotZoomer::end(), and QwtPlotPicker::end().
int QwtPicker::selectionFlags () const
Returns:
Selection flags, an Or´d value of SelectionType, RectSelectionType and SelectionMode.
See also:
setSelectionFlags(), SelectionType, RectSelectionType, SelectionMode
Definition at line 184 of file qwt_picker.cpp.
Referenced by drawRubberBand(), and QwtPlotPicker::end().
void QwtPicker::setCursorLabelFont (const QFont & font) [virtual]
Set the font for the cursor label
Parameters:
font Cursor label font
See also:
cursorLabelFont(), setCursorLabelMode(), setCursorLabelPen()
Definition at line 317 of file qwt_picker.cpp.
References drawCursorLabel(), and isEnabled().
void QwtPicker::setCursorLabelMode (DisplayMode mode) [virtual]
Set the display mode of the cursor label.
A cursor label dispays the current position of the cursor as a string. The display mode controls if the label has to be displayed whenever the observed widget has focus and cursor (AlwaysOn), never (AlwaysOff), or only when the selection is active (ActiveOnly).
Parameters:
mode Cursor label display mode
Warning:
In case of AlwaysOn, mouseTracking will be enabled for the observed widget.
See also:
cursorLabelMode(), DisplayMode
Definition at line 227 of file qwt_picker.cpp.
void QwtPicker::setCursorLabelPen (const QPen & pen) [virtual]
Set the pen for the cursor label
Parameters:
pen Cursor label pen
See also:
cursorLabelPen(), setCursorLabelMode(), setCursorLabelFont()
Definition at line 347 of file qwt_picker.cpp.
References drawCursorLabel(), and isEnabled().
void QwtPicker::setEnabled (bool enabled) [virtual]
En/disable the picker.
When enabled is TRUE an event filter is installed for the observed
widget, otherwise the event filter is removed.
Parameters:
enabled TRUE or FALSE
See also:
isEnabled(), eventFilter()
Definition at line 283 of file qwt_picker.cpp.
References drawCursorLabel(), and parentWidget().
void QwtPicker::setResizeMode (ResizeMode mode) [virtual]
Set the resize mode.
The resize mode controls what to do with the selected points of an
active selection when the observed widget is resized.
Stretch means the points are scaled according to the new size, KeepSize means the points remain unchanged.
The default mode is Stretch.
Parameters:
mode Resize mode
See also:
resizeMode(), ResizeMode
Definition at line 259 of file qwt_picker.cpp.
void QwtPicker::setRubberBand (RubberBand rubberBand) [virtual]
Set the rubberband style
Parameters:
rubberBand Rubberband style The default value is NoRubberBand.
See also:
rubberBand(), RubberBand, setRubberBandPen()
Definition at line 197 of file qwt_picker.cpp.
void QwtPicker::setRubberBandPen (const QPen & pen) [virtual]
Set the pen for the rubberband
Parameters:
pen Rubberband pen
See also:
rubberBandPen(), setRubberBand()
Definition at line 376 of file qwt_picker.cpp.
References drawRubberBand().
void QwtPicker::setSelectionFlags (int flags) [virtual]
Set the selection flags
Parameters:
flags Or´d value of SelectionType, RectSelectionType and SelectionMode. The default value is NoSelection.
See also:
selectionFlags(), SelectionType, RectSelectionType, SelectionMode
Reimplemented in QwtPlotZoomer.
Definition at line 173 of file qwt_picker.cpp.
References stateMachine().
Referenced by QwtPlotZoomer::setSelectionFlags().
QwtPickerMachine * QwtPicker::stateMachine (int flags) const [protected,
virtual]
Create a state machine depending on the selection flags.
· PointSelection | ClickSelection
QwtPickerClickPointMachine()
· PointSelection | DragSelection
QwtPickerDragPointMachine()
· RectSelection | ClickSelection
QwtPickerClickRectMachine()
· RectSelection | DragSelection
QwtPickerDragRectMachine()
· PolygonSelection
QwtPickerPolygonMachine()
See also:
setSelectionFlags()
Definition at line 121 of file qwt_picker.cpp.
Referenced by setSelectionFlags().
void QwtPicker::stretchSelection (const QSize & oldSize, const QSize &
newSize) [protected, virtual] Scale the selection by the ratios of oldSize and newSize The changed() signal is emitted.
Parameters:
oldSize Previous size
newSize Current size
See also:
ResizeMode, setResizeMode(), resizeMode()
Definition at line 1153 of file qwt_picker.cpp.
References changed().
Referenced by eventFilter().
void QwtPicker::transition (const QEvent * e) [protected, virtual]
Passes an event to the state machine and executes the resulting
commands. Append and Move commands use the current position of the
cursor (QCursor::pos()).
Parameters:
e Event
Definition at line 970 of file qwt_picker.cpp.
References append(), begin(), end(), move(), parentWidget(), and
QwtPickerMachine::transition().
Referenced by widgetKeyPressEvent(), widgetKeyReleaseEvent(),
widgetMouseDoubleClickEvent(), widgetMouseMoveEvent(),
widgetMousePressEvent(), widgetMouseReleaseEvent(), and
widgetWheelEvent().
void QwtPicker::widgetKeyPressEvent (QKeyEvent * ke) [protected, virtual]
Handle a key press event for the observed widget.
Selections can be completely done by the keyboard. The arrow keys move the cursor, the abort key aborts a selection. All other keys are
handled by the current state machine.
See also:
QwtPicker, selectionFlags()
eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(), widgetMouseDoubleClickEvent(), widgetMouseMoveEvent(), widgetWheelEvent(), widgetKeyReleaseEvent(), stateMachine(), QwtEventPattern::KeyPatternCode
Reimplemented in QwtPlotZoomer.
Definition at line 904 of file qwt_picker.cpp.
References end(), isActive(), QwtEventPattern::keyMatch(),
parentWidget(), pickRect(), QwtPickerMachine::reset(), and
transition().
Referenced by eventFilter(), and QwtPlotZoomer::widgetKeyPressEvent().
void QwtPicker::widgetKeyReleaseEvent (QKeyEvent * ke) [protected, virtual]
Handle a key release event for the observed widget.
Passes the event to the state machine.
See also:
eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(), widgetMouseDoubleClickEvent(), widgetMouseMoveEvent(), widgetWheelEvent(), widgetKeyPressEvent(), stateMachine()
Definition at line 958 of file qwt_picker.cpp.
References transition().
Referenced by eventFilter().
void QwtPicker::widgetMouseDoubleClickEvent (QMouseEvent * me) [protected,
virtual]
Handle mouse double click event for the observed widget.
Empty implementation, does nothing.
See also:
eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(), widgetMouseMoveEvent(), widgetWheelEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent()
Definition at line 861 of file qwt_picker.cpp.
References transition().
Referenced by eventFilter().
void QwtPicker::widgetMouseMoveEvent (QMouseEvent * e) [protected, virtual]
Handle a mouse move event for the observed widget.
Move the last point of the selection in case of isActive() == TRUE
See also:
eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(), widgetMouseDoubleClickEvent(), widgetWheelEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent()
Definition at line 822 of file qwt_picker.cpp.
References drawCursorLabel(), pickRect(), and transition().
Referenced by eventFilter().
void QwtPicker::widgetMousePressEvent (QMouseEvent * e) [protected,
virtual]
Handle a mouse press event for the observed widget.
Begin and/or end a selection depending on the selection flags.
See also:
QwtPicker, selectionFlags()
eventFilter(), widgetMouseReleaseEvent(), widgetMouseDoubleClickEvent(), widgetMouseMoveEvent(), widgetWheelEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent()
Definition at line 808 of file qwt_picker.cpp.
References transition().
Referenced by eventFilter().
void QwtPicker::widgetMouseReleaseEvent (QMouseEvent * e) [protected,
virtual]
Handle a mouse relase event for the observed widget.
End a selection depending on the selection flags.
See also:
QwtPicker, selectionFlags()
eventFilter(), widgetMousePressEvent(), widgetMouseDoubleClickEvent(), widgetMouseMoveEvent(), widgetWheelEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent()
Reimplemented in QwtPlotZoomer.
Definition at line 847 of file qwt_picker.cpp.
References transition().
Referenced by eventFilter(), and
QwtPlotZoomer::widgetMouseReleaseEvent().
void QwtPicker::widgetWheelEvent (QWheelEvent * e) [protected, virtual]
Handle a wheel event for the observed widget.
Move the last point of the selection in case of isActive() == TRUE
See also:
eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(), widgetMouseDoubleClickEvent(), widgetMouseMoveEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent()
Definition at line 876 of file qwt_picker.cpp.
References drawCursorLabel(), pickRect(), and transition().
Referenced by eventFilter().

Author

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Version 4.2.0 16 Nov 2004 QwtPicker(3)

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