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ACG::QtWidgets::QtWheel Class Reference
Inheritance diagram for ACG::QtWidgets::QtWheel:

## Public Types
enum | Orientation { Horizontal, Vertical }
| Orientation of the widget.

## Signals
void | angleChangedTo (double _angle)
void | angleChangedBy (double _angle)
void | gearUp ()
void | gearDown ()
| Like gearUp() but the value of gear() halves.
void | hideWheel ()
| Emitted when the wheel will be hidden by the context menu.

## Public Member Functions
| QtWheel (QWidget *_parent=0, const char *_name=0, Orientation _orientation=Horizontal)
| Constructor.
virtual | ~QtWheel ()
| Destructor.
int | ticks () const
| get number of ticks on the wheel
void | setTicks (int _number)
| set `_number` of ticks on the wheel (default: 36)
double | angle () const
| get current angle of the wheel (radiants, unbounded, cf. clip())
void | setAngle (double _angle)
| set current angle of the wheel (radiants, unbounded, cf. clip())
double | diffAngle () const
bool | marker () const
| Are there markers on the wheel?
void | setMarker (bool _b)
| enable/disable markers on the wheel
Orientation | orientation () const
| get orientation
void | setOrientation (Orientation _orientation)
| set orientation
bool | draggingWheel () const
| Is the user currently dragging the wheel whith the mouse?
void | setTracking (bool _b)
bool | tracking () const
| Is tracking on?
void | setGear (double _g)
double | gear () const
| How fast does angle() change when the wheel is turned? (see above)
virtual QSizePolicy | sizePolicy () const
| reimplemented
virtual QSize | sizeHint () const
| reimplemented

## Static Public Member Functions
static double | clip (double _angle)
static double | deg (double _angle)
| maps `_angle` from radiants to degrees (works also for clip()ped angles)

## Protected Member Functions
virtual void | mousePressEvent (QMouseEvent *)
| reimplemented
virtual void | mouseReleaseEvent (QMouseEvent *)
| reimplemented
virtual void | mouseMoveEvent (QMouseEvent *)
| reimplemented
virtual void | mouseDoubleClickEvent (QMouseEvent *)
| reimplemented
virtual void | keyPressEvent (QKeyEvent *)
| reimplemented
virtual void | keyReleaseEvent (QKeyEvent *)
| reimplemented
virtual void | resizeEvent (QResizeEvent *)
| reimplemented
virtual void | paintEvent (QPaintEvent *)
| reimplemented More...
virtual void | drawContents (QPainter *)
| reimplemented
virtual void | redrawPixmap ()
| draw wheel to pixmap (double buffering)

## Private Slots
void | slotCustomContextMenuRequested (const QPoint &pos)

## Private Member Functions
| QtWheel (const QtWheel &)
| Copy constructor. Never used!
QtWheel & | operator= (const QtWheel &)
| Assignment operator. Never used!
double | turn (const QPoint &_pos)
void | updateMenu ()
| updates the ticks of the menu
void | shrinkRect (QRect &, int, int)
| expands a rectangle in x/y direction

## Private Attributes
double | angle_
| current angle of the wheel
double | lastAngle_
| last angle, depends on tracking_
int | size_
| size of wheel in pixels
double | gear_
| speed of revolution
int | gearShift_
| click-shifted gear by 2^gearShift_
Orientation | orientation_
| orientation of the widget
int | ticks_
| number of ticks on the wheel
bool | marker_
| should ticks be marked by colors?
QPoint | pos_
| recent mouse position
bool | dragging_
| currently dragging the slider?
bool | tracking_
| tracking on?
QPalette | palette_
| color group
QPixmap | pixmap_
| pixmap of the wheel

## Detailed Description

Definition at line 107 of file QtWheel.hh.

## Member Function Documentation

void ACG::QtWidgets::QtWheel::angleChangedBy | ( | double | _angle | ) |
| signal

The angle chaned by the relative `_angle` (cf. clip()).

Note: Do not use this signal together with angleChangedBy()! The reason for this is that you cannot be sure in which order the you get the signals!

If you need both values the angle and the relative difference then use this signal and angle() or angleChangedTo() and diffAngle() respectively!

void ACG::QtWidgets::QtWheel::angleChangedTo | ( | double | _angle | ) |
| signal

The angle changed to the absolute `_angle` (cf. clip()). Note: Do not use together with angleChangedBy() (see there)!

double ACG::QtWidgets::QtWheel::clip | ( | double | _angle | ) |
| static

Clips `_angle` to range [0,2pi[. All angle()s provided by this widget are unbounded in a sense that a full turn of the wheel is 2pi not 0. As a consequence two full turns are 4pi, etc.

This methods clips the angle again [0,2pi[

See also
  deg()

Definition at line 443 of file QtWheel.cc.

double ACG::QtWidgets::QtWheel::diffAngle | ( |  | ) | const
| inline

Get difference angle. You may call this method from a slot connected to angleChangedTo() and obtain the difference angle (equal to the argument to angleChangedBy()).

Definition at line 150 of file QtWheel.hh.

void ACG::QtWidgets::QtWheel::gearUp | ( |  | ) |
| signal

The gear() has been "shifted" by double clicking the widget. Up-shifting will double the value of gear(). The signal is emitted after gear() has been changed.

void ACG::QtWidgets::QtWheel::paintEvent | ( | QPaintEvent * | _e | ) |
| protected virtual

reimplemented

Todo:
  : bitBlt(this,r.left(),r.top(),pixmap_);

Definition at line 283 of file QtWheel.cc.

void ACG::QtWidgets::QtWheel::setGear | ( | double | _g | ) |
| inline

How fast does angle() changed when the wheel is turned? The default setting is 1.0. Then angle() will be changed by pi (180 degrees) when dragging the wheel from one end of the widget to the other. In general this angular difference will be multiplied by gear(), i.e. for values >1,0 the angle changes faster.

Definition at line 186 of file QtWheel.hh.

void ACG::QtWidgets::QtWheel::setTracking | ( | bool | _b | ) |
| inline

Enables wheel tracking (default: true)

If tracking is enabled, then the QtWheel emits signals whenever the it is dragged. Otherwise signals are emitted only when a dragging process is finished.

Definition at line 175 of file QtWheel.hh.

The documentation for this class was generated from the following files:

- ACG/QtWidgets/QtWheel.hh
- ACG/QtWidgets/QtWheel.cc