# SoDragger Class Reference
[Draggers]

`#include <Inventor/draggers/SoDragger.h>`

Inheritance diagram for SoDragger:

List of all members.

## Detailed Description

The SoDragger class is the base class for all draggers.

Draggers is a mechanism used for letting the end-users of your application code interact with elements in 3D, by scaling, rotating or translating geometry or other instances in the scene (like cameras or lightsources).

For a very thorough introduction and tutorial to the dragger classes and general concepts, we advise you to consult «The Inventor Mentor», ISBN 0-201-62495-8, chapter 15.

This is the common superclass for all dragger classes.

It holds the current motion matrix, and offers lots of convenience methods to build from for it's subclasses -- that is, the non-abstract dragger classes to use as nodes in your scenegraph.

The motion matrix is used to modify the model matrix during traversal, and this is a common dragger mechanism -- all draggers should update this during dragging.

A number of the Coin dragger classes have built-in convenience wrapper classes, called manipulators. See for instance the SoTrackballDragger / SoTrackballManip pair.

The matching manipulator class for any dragger class has basically two convenient additions to the functionality of the stand-alone dragger: 1) it makes swapping the dragger in and out of the scenegraph very straightforward (something which is often done for draggers in 3D user interfaces), 2) it wraps up the dragger with SoSurroundScale and SoAntiSquish nodes where applicable, so the dragger geometry automatically scales up or down to match the geometry it influences.

This last functionality can also be duplicated in a rather straightforward manner outside of the context of a manipulator, as can be seen from the usage example in the SoSurroundScale class documentation.

The appearance of draggers can be modified by either using the SoDragger::setPart() method (see usage example below) or by setting up external Inventor-format files which the geometry parts are read from. The latter method can be done by setting the environment variable `SO_DRAGGER_DIR` to point to a directory with replacement geometry files. The name of the new files and the name of the nodes / sub-graphs with the replacement geometries must follow a rigid scheme. We advise you to look at the Coin sourcecode directory Coin/data/draggerDefaults/ to see how the replacement geometry files should be named. Setting `SO_DRAGGER_DIR` to this directory and modifying the files there provides a convenient way to play around with new dragger geometry arrangements.

As mentioned above, SoDragger::setPart() can be used to modify the appearance of a dragger by changing it's default geometry. One common technique is for instance to take advantage of this to use only parts of a dragger, by replacing / disabling the geometry that you don't want the end-user to interact with. The following code example shows how to remove the translation functionality of the SoTransformBoxDragger:

      #include <Inventor/Qt/SoQt.h>
      #include <Inventor/Qt/viewers/SoQtExaminerViewer.h>
      #include <Inventor/draggers/SoTransformBoxDragger.h>
      #include <Inventor/nodes/SoSeparator.h>

      int
      main(int argc, char ** argv)
      {
        QWidget * window = SoQt::init(argv[0]);

        SoTransformBoxDragger * dragger = new SoTransformBoxDragger;

        SbString str;
        for (int i = 1; i <= 6; i++) {
          str.sprintf("translator%d.translator", i);
          dragger->setPart(str.getString(), new SoSeparator);
        }

        SoQtExaminerViewer * viewer = new SoQtExaminerViewer(window);
        viewer->setSceneGraph(dragger);
        viewer->show();
        SoQt::show(window);

        SoQt::mainLoop();

        delete viewer;
        return 0;
      }

Draggers are also node kits, and below is the catalog structure for this top-level dragger class.

Node kit structure (new entries versus parent class marked with arrow prefix):

      CLASS SoDragger
      -->"this"
            "callbackList"
            "topSeparator"
      -->      "motionMatrix"
               "geomSeparator"

(See SoBaseKit::printDiagram() for information about the output formatting.)

Detailed information on catalog parts:

      CLASS SoDragger
      PVT   "this",  SoDragger  ---
            "callbackList",  SoNodeKitListPart [ SoCallback, SoEventCallback ]
      PVT   "topSeparator",  SoSeparator  ---
      PVT   "motionMatrix",  SoMatrixTransform  ---
      PVT   "geomSeparator",  SoSeparator  ---

(See SoBaseKit::printTable() for information about the output formatting.)

## Public Types

enum | ProjectorFrontSetting { FRONT, BACK, USE_PICK }

## Public Member Functions

virtual void | callback (SoCallbackAction *action)
virtual void | GLRender (SoGLRenderAction *action)
virtual void | getMatrix (SoGetMatrixAction *action)
virtual void | rayPick (SoRayPickAction *action)
virtual void | search (SoSearchAction *action)
virtual void | write (SoWriteAction *action)
virtual void | getPrimitiveCount (SoGetPrimitiveCountAction *action)
void | addStartCallback (SoDraggerCB *func, void *data=NULL)
void | removeStartCallback (SoDraggerCB *func, void *data=NULL)
void | addMotionCallback (SoDraggerCB *func, void *data=NULL)
void | removeMotionCallback (SoDraggerCB *func, void *data=NULL)
void | addFinishCallback (SoDraggerCB *func, void *data=NULL)
void | removeFinishCallback (SoDraggerCB *func, void *data=NULL)
void | addValueChangedCallback (SoDraggerCB *func, void *data=NULL)
void | removeValueChangedCallback (SoDraggerCB *func, void *data=NULL)
void | setMinGesture (int pixels)
int | getMinGesture (void) const
SbBool | enableValueChangedCallbacks (SbBool newval)
const SbMatrix & | getMotionMatrix (void)
void | addOtherEventCallback (SoDraggerCB *func, void *data=NULL)
void | removeOtherEventCallback (SoDraggerCB *func, void *data=NULL)
void | registerChildDragger (SoDragger *child)
void | unregisterChildDragger (SoDragger *child)
void | registerChildDraggerMovingIndependently (SoDragger *child)
void | unregisterChildDraggerMovingIndependently (SoDragger *child)
SbMatrix | getLocalToWorldMatrix (void)
SbMatrix | getWorldToLocalMatrix (void)
SbVec3f | getLocalStartingPoint (void)
SbVec3f | getWorldStartingPoint (void)
void | getPartToLocalMatrix (const SbName &partname, SbMatrix &parttolocalmatrix, SbMatrix &localtopartmatrix)
void | transformMatrixLocalToWorld (const SbMatrix &frommatrix, SbMatrix &tomatrix)
void | transformMatrixWorldToLocal (const SbMatrix &frommatrix, SbMatrix &tomatrix)
void | transformMatrixToLocalSpace (const SbMatrix &frommatrix, SbMatrix &tomatrix, const SbName &fromspacepartname)
void | setMotionMatrix (const SbMatrix &newmatrix)
void | valueChanged (void)
const SbMatrix & | getStartMotionMatrix (void)
virtual void | saveStartParameters (void)
const SoPath * | getPickPath (void) const
const SoEvent * | getEvent (void) const
SoPath * | createPathToThis (void)
const SoPath * | getSurrogatePartPickedOwner (void) const
const SbName & | getSurrogatePartPickedName (void) const
const SoPath * | getSurrogatePartPickedPath (void) const
void | setStartingPoint (const SoPickedPoint *newpoint)
void | setStartingPoint (const SbVec3f &newpoint)
const SbViewVolume & | getViewVolume (void)
void | setViewVolume (const SbViewVolume &vol)
const SbViewportRegion & | getViewportRegion (void)
void | setViewportRegion (const SbViewportRegion &reg)
SoHandleEventAction * | getHandleEventAction (void) const
void | setHandleEventAction (SoHandleEventAction *newAction)
void | setTempPathToThis (const SoPath *somethingclose)
virtual void | grabEventsSetup (void)
virtual void | grabEventsCleanup (void)
void | workFieldsIntoTransform (SbMatrix &mtx)
void | setFrontOnProjector (ProjectorFrontSetting newval)
ProjectorFrontSetting | getFrontOnProjector (void) const

## Static Public Member Functions

void | setMinScale (float newminscale)
float | getMinScale (void)
void | workValuesIntoTransform (SbMatrix &mtx, const SbVec3f *translationptr, const SbRotation *rotationptr, const SbVec3f *scalefactorptr, const SbRotation *scaleorientationptr, const SbVec3f *centerptr)
void | getTransformFast (SbMatrix &mtx, SbVec3f &translation, SbRotation &rotation, SbVec3f &scalefactor, SbRotation &scaleorientation, const SbVec3f &center)
void | getTransformFast (SbMatrix &mtx, SbVec3f &translation, SbRotation &rotation, SbVec3f &scalefactor, SbRotation &scaleorientation)
SbMatrix | appendTranslation (const SbMatrix &mtx, const SbVec3f &translation, const SbMatrix *conversion=NULL)
SbMatrix | appendScale (const SbMatrix &mtx, const SbVec3f &scale, const SbVec3f &scalecenter, const SbMatrix *conversion=NULL)
SbMatrix | appendRotation (const SbMatrix &mtx, const SbRotation &rot, const SbVec3f &rotcenter, const SbMatrix *conversion=NULL)
void | initClass (void)
void | initClasses (void)

## Public Attributes

SoSFBool | isActive

## Protected Member Functions

| SoDragger (void)
virtual | ~SoDragger ()
SbVec2f | getNormalizedLocaterPosition (void)
SbVec2s | getLocaterPosition (void)
SbVec2s | getStartLocaterPosition (void) const
void | setStartLocaterPosition (SbVec2s p)
SbBool | isAdequateConstraintMotion (void)
virtual SbBool | shouldGrabBasedOnSurrogate (const SoPath *pickpath, const SoPath *surrogatepath)
void | setCameraInfo (SoAction *action)
virtual void | handleEvent (SoHandleEventAction *ha)
void | transferMotion (SoDragger *child)
void | setIgnoreInBbox (SbBool newval)
SbBool | isIgnoreInBbox (void)
virtual void | getBoundingBox (SoGetBoundingBoxAction *action)
void | setActiveChildDragger (SoDragger *newchilddragger)
SoDragger * | getActiveChildDragger (void) const
virtual void | setDefaultOnNonWritingFields (void)
void | updateDraggerCache (const SoPath *path)

## Static Protected Member Functions

void | childTransferMotionAndValueChangedCB (void *, SoDragger *)
void | childValueChangedCB (void *, SoDragger *)
void | childStartCB (void *, SoDragger *)
void | childMotionCB (void *, SoDragger *)
void | childFinishCB (void *, SoDragger *)
void | childOtherEventCB (void *, SoDragger *)

## Member Enumeration Documentation

enum SoDragger::ProjectorFrontSetting

Holds various settings for projectors, which might affect cylindrical and spherical based draggers. Specifies whether dragging should be based on the front or back of the sphere / cylinder, or if the picked point should be used to decide this.

Enumeration values:

  FRONT | Always use front of projector.
  BACK | Always use back of projector.
  USE_PICK | Use picked point to decide front or back of projector.

## Constructor & Destructor Documentation

SoDragger::SoDragger | ( | void |  | ) | `[protected]`

| A protected constructor for this abstract superclass for all Coin draggers.

SoDragger::~SoDragger | ( |  | ) | `[protected, virtual]`

| Virtual protected destructor.

## Member Function Documentation

void SoDragger::callback | ( | SoCallbackAction * | action | ) | `[virtual]`

| Action method for SoCallbackAction. Simply updates the state according to how the node behaves for the render action, so the application programmer can use the SoCallbackAction for extracting information about the scene graph. Reimplemented from SoBaseKit.

void SoDragger::GLRender | ( | SoGLRenderAction * | action | ) | `[virtual]`

| Action method for the SoGLRenderAction. This is called during rendering traversals. Nodes influencing the rendering state in any way or who wants to throw geometry primitives at OpenGL overrides this method. Reimplemented from SoBaseKit. Reimplemented in SoTabPlaneDragger.

void SoDragger::getMatrix | ( | SoGetMatrixAction * | action | ) | `[virtual]`

| Action method for SoGetMatrixAction. Updates action by accumulating with the transformation matrix of this node (if any). Reimplemented from SoBaseKit. Reimplemented in SoCenterballDragger.

void SoDragger::rayPick | ( | SoRayPickAction * | action | ) | `[virtual]`

| Action method for SoRayPickAction. Checks the ray specification of the action and tests for intersection with the data of the node. Nodes influencing relevant state variables for how picking is done also overrides this method. Reimplemented from SoBaseKit.

void SoDragger::search | ( | SoSearchAction * | action | ) | `[virtual]`

Action method for SoSearchAction.

Compares the search criteria from the action to see if this node is a match. Searching is done by matching up all criteria set up in the SoSearchAction -- if any of the requested criteria is a miss, the search is not deemed successful for the node.

See also:
  SoSearchAction

Reimplemented from SoBaseKit.

void SoDragger::write | ( | SoWriteAction * | action | ) | `[virtual]`

| Action method for SoWriteAction. Writes out a node object, and any connected nodes, engines etc, if necessary. Reimplemented from SoBaseKit.

void SoDragger::getPrimitiveCount | ( | SoGetPrimitiveCountAction * | action | ) | `[virtual]`

| Action method for the SoGetPrimitiveCountAction. Calculates the number of triangle, line segment and point primitives for the node and adds these to the counters of the action. Nodes influencing how geometry nodes calculates their primitive count also overrides this method to change the relevant state variables. Reimplemented from SoBaseKit.

void SoDragger::addStartCallback | ( | SoDraggerCB * | func,
|  | void * | data = NULL
| ) |

| Adds a callback which is called at the start of a drag, after the mouse button 1 is pressed, and dragger is picked.

void SoDragger::removeStartCallback | ( | SoDraggerCB * | func,
|  | void * | data = NULL
| ) |

Removes a previously registered start callback.

See also:
  addStartCallback()

void SoDragger::addMotionCallback | ( | SoDraggerCB * | func,
|  | void * | data = NULL
| ) |

| Adds a callback which is called for each mouse movement during dragging.

void SoDragger::removeMotionCallback | ( | SoDraggerCB * | func,
|  | void * | data = NULL
| ) |

Removes a previously registered motion callback.

See also:
  addMotionCallback()

void SoDragger::addFinishCallback | ( | SoDraggerCB * | func,
|  | void * | data = NULL
| ) |

| Adds a callback which is called after dragging is finished.

void SoDragger::removeFinishCallback | ( | SoDraggerCB * | func,
|  | void * | data = NULL
| ) |

Removes a finish callback.

See also:
  addFinishCallback()

void SoDragger::addValueChangedCallback | ( | SoDraggerCB * | func,
|  | void * | data = NULL
| ) |

Adds a callback which is called after a dragger has changed a field. It is not called if the SoDragger::isActive field is changed.

See also:
  enableValueChangedCallback()

void SoDragger::removeValueChangedCallback | ( | SoDraggerCB * | func,
|  | void * | data = NULL
| ) |

Removes a value changed callback.

See also:
  addValueChangedCallback()

void SoDragger::setMinGesture | ( | int | pixels | ) |

| Sets the number of pixel movement needed to trigger a constraint gesture. Default is 8 pixels.

int SoDragger::getMinGesture | ( | void |  | ) | const

Returns the gesture pixels threshold value.

See also:
  setMinGesture()

SbBool SoDragger::enableValueChangedCallbacks | ( | SbBool | val | ) |

Enable or disable "value changed" callbacks.

See also:
  addValueChangedCallback()

const SbMatrix & SoDragger::getMotionMatrix | ( | void |  | ) |

| Returns the motion matrix for this dragger.

void SoDragger::addOtherEventCallback | ( | SoDraggerCB * | func,
|  | void * | data = NULL
| ) |

| Adds an event callback for events other then drag events. As soon as dragging starts, the dragger grabs all events (until mouse button is released). This method can be used to handle other events during dragging.

void SoDragger::removeOtherEventCallback | ( | SoDraggerCB * | func,
|  | void * | data = NULL
| ) |

Removes a other event callback.

See also:
  addOtherEventCallback()

void SoDragger::registerChildDragger | ( | SoDragger * | child | ) |

| Should be called by compound draggers to register child draggers.

void SoDragger::unregisterChildDragger | ( | SoDragger * | child | ) |

| Should be called by compound draggers to unregister child draggers.

void SoDragger::registerChildDraggerMovingIndependently | ( | SoDragger * | child | ) |

| Should be called by compund draggers to register child draggers that should move independently of their parent.

void SoDragger::unregisterChildDraggerMovingIndependently | ( | SoDragger * | child | ) |

Should be called by compund draggers to unregister child draggers.

See also:
  registerChildDraggerMovingIndependently()

SbMatrix SoDragger::getLocalToWorldMatrix | ( | void |  | ) |

| Returns a matrix that converts from local to world space.

SbMatrix SoDragger::getWorldToLocalMatrix | ( | void |  | ) |

| Returns a matrix that converts from world to local space.

SbVec3f SoDragger::getLocalStartingPoint | ( | void |  | ) |

| Returns the drag starting point in the local coordinate system.

SbVec3f SoDragger::getWorldStartingPoint | ( | void |  | ) |

| Returns the drag starting point in the world coordinate system.

void SoDragger::getPartToLocalMatrix | ( | const SbName & | partname,
|  | SbMatrix & | parttolocalmatrix,
|  | SbMatrix & | localtopartmatrix
| ) |

| Returns matrices that will convert between local space and the space in which partname lies in.

void SoDragger::transformMatrixLocalToWorld | ( | const SbMatrix & | frommatrix,
|  | SbMatrix & | tomatrix
| ) |

| Convenience method that transforms the local frommatrix to a world coordinate systems matrix.

void SoDragger::transformMatrixWorldToLocal | ( | const SbMatrix & | frommatrix,
|  | SbMatrix & | tomatrix
| ) |

| Convenience method that transforms the world frommatrix to a local coordinate systems matrix.

void SoDragger::transformMatrixToLocalSpace | ( | const SbMatrix & | frommatrix,
|  | SbMatrix & | tomatrix,
|  | const SbName & | fromspacepartname
| ) |

| Transforms a matrix that lies in the frompartname coordinate system into the local coordinate system.

void SoDragger::setMotionMatrix | ( | const SbMatrix & | matrix | ) |

| Sets a new current motion matrix for the dragger geometry. Triggers value changed callbacks if matrix is unequal to the previous motion matrix.

void SoDragger::valueChanged | ( | void |  | ) |

| Can be called by subclasses to trigger value changed callbacks. This might be needed if a field is changed without changing the motion matrix.

const SbMatrix & SoDragger::getStartMotionMatrix | ( | void |  | ) |

| Returns the motion matrix as it was when saveStartParameters() was called.

void SoDragger::saveStartParameters | ( | void |  | ) | `[virtual]`

| This is invoked to save start parameters, to enable draggers to calculate relative motion. Default method in superclass SoDragger just saves the motion matrix, but subclasses should overload this method if other data needs to be saved. Reimplemented in SoCenterballDragger.

const SoPath * SoDragger::getPickPath | ( | void |  | ) | const

| Returns the picked path.

const SoEvent * SoDragger::getEvent | ( | void |  | ) | const

| Returns the current event.

SoPath * SoDragger::createPathToThis | ( | void |  | ) |

| Creates a new path to this dragger. Don't forget to ref() and unref() since this method creates a fresh copy for you.

const SoPath * SoDragger::getSurrogatePartPickedOwner | ( | void |  | ) | const

| Returns the path to the SoInteractionKit that holds the current surrogate path.

const SbName & SoDragger::getSurrogatePartPickedName | ( | void |  | ) | const

| Returns the name of the path in the SoInteractionKit that holds the current surrogate path.

const SoPath * SoDragger::getSurrogatePartPickedPath | ( | void |  | ) | const

| Returns the current surrogate path.

void SoDragger::setStartingPoint | ( | const SoPickedPoint * | point | ) |

| Sets the staring point for the drag. point is usually a picked point from a SoRayPickAction.

void SoDragger::setStartingPoint | ( | const SbVec3f & | point | ) |

| Sets the starting point for a drag.

const SbViewVolume & SoDragger::getViewVolume | ( | void |  | ) |

| Return the current view volume.

void SoDragger::setViewVolume | ( | const SbViewVolume & | vv | ) |

| Sets the current view volume.

const SbViewportRegion & SoDragger::getViewportRegion | ( | void |  | ) |

| Returns the current viewport region.

void SoDragger::setViewportRegion | ( | const SbViewportRegion & | vp | ) |

| Sets the current viewport region.

SoHandleEventAction * SoDragger::getHandleEventAction | ( | void |  | ) | const

| Return the current (most recent) SoHandleEventAction.

void SoDragger::setHandleEventAction | ( | SoHandleEventAction * | action | ) |

| Stores a handle event action.

void SoDragger::setTempPathToThis | ( | const SoPath * | somethingclose | ) |

| This function is part of the original SGI Inventor 2.1 API, but has not been implemented in Coin as it looks like a function which should probably have been private in Open Inventor.

void SoDragger::grabEventsSetup | ( | void |  | ) | `[virtual]`

Called when dragger starts grabbing events (mouse button down). Overload if you need to do something extra in your dragger.

See also:
  grabEventCleanup()

Reimplemented from SoNode.

void SoDragger::grabEventsCleanup | ( | void |  | ) | `[virtual]`

Called when dragger stops grabbing events (mouse button up).

See also:
  grabEventSetup()

Reimplemented from SoNode.

void SoDragger::workFieldsIntoTransform | ( | SbMatrix & | matrix | ) |

| Examines the fields of the dragger, changes the matrix according to those fields and leaves the rest of the matrix as it was. The following field names are supported: translation, scaleFactor, rotation and scaleOrientation.

void SoDragger::setFrontOnProjector | ( | ProjectorFrontSetting | val | ) |

| Controls the behaviour of the SbProjector.

SoDragger::ProjectorFrontSetting SoDragger::getFrontOnProjector | ( | void |  | ) | const

| Returns the behaviour of the SbProjector.

void SoDragger::setMinScale | ( | float | minscale | ) | `[static]`

| Sets the minimum scale value all scale factors are clamped against. This is used in workFieldsIntoTransform(). The default value is 0.01

float SoDragger::getMinScale | ( | void |  | ) | `[static]`

Returns the minimum scale value.

See also:
  setMinScale()

void SoDragger::workValuesIntoTransform | ( | SbMatrix & | matrix,
|  | const SbVec3f * | translationptr,
|  | const SbRotation * | rotationptr,
|  | const SbVec3f * | scalefactorptr,
|  | const SbRotation * | scaleorientationptr,
|  | const SbVec3f * | centerptr
| ) | `[static]`

| Same as above, but pointers to values are supplied. If a pointer is `NULL`, the matrix value for that argument is used when reconstructing the matrix.

void SoDragger::getTransformFast | ( | SbMatrix & | matrix,
|  | SbVec3f & | translation,
|  | SbRotation & | rotation,
|  | SbVec3f & | scalefactor,
|  | SbRotation & | scaleorientation,
|  | const SbVec3f & | center
| ) | `[static]`

| Can be used when there is no scaleorientation. Faster than SoDragger::workValuesIntoTransform().

void SoDragger::getTransformFast | ( | SbMatrix & | matrix,
|  | SbVec3f & | translation,
|  | SbRotation & | rotation,
|  | SbVec3f & | scalefactor,
|  | SbRotation & | scaleorientation
| ) | `[static]`

| This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

SbMatrix SoDragger::appendTranslation | ( | const SbMatrix & | matrix,
|  | const SbVec3f & | translation,
|  | const SbMatrix * | conversion = NULL
| ) | `[static]`

| Returns matrix after translation has been appended. If conversion != `NULL` it is used to transform translation into the space matrix is defined.

SbMatrix SoDragger::appendScale | ( | const SbMatrix & | matrix,
|  | const SbVec3f & | scale,
|  | const SbVec3f & | scalecenter,
|  | const SbMatrix * | conversion = NULL
| ) | `[static]`

| Returns matrix after scale and scalecenter has been appended. If conversion != `NULL` it is used to transform scale into the space matrix is defined.

SbMatrix SoDragger::appendRotation | ( | const SbMatrix & | matrix,
|  | const SbRotation & | rot,
|  | const SbVec3f & | rotcenter,
|  | const SbMatrix * | conversion = NULL
| ) | `[static]`

| Appends rot, around rotcenter, to matrix. If conversion is != `NULL`, this is used to move the rotation into that coordinate systems before appending the rotation.

void SoDragger::initClass | ( | void |  | ) | `[static]`

Initializes type system for this dragger class.

Application programmers should usually not have to invoke this method, see documentation of SoInteraction::init().

Reimplemented from SoInteractionKit.

Reimplemented in SoCenterballDragger, SoDirectionalLightDragger, SoDragPointDragger, SoHandleBoxDragger, SoJackDragger, SoPointLightDragger, SoRotateCylindricalDragger, SoRotateDiscDragger, SoRotateSphericalDragger, SoScale1Dragger, SoScale2Dragger, SoScale2UniformDragger, SoScaleUniformDragger, SoSpotLightDragger, SoTabBoxDragger, SoTabPlaneDragger, SoTrackballDragger, SoTransformBoxDragger, SoTransformerDragger, SoTranslate1Dragger, and SoTranslate2Dragger.

void SoDragger::initClasses | ( | void |  | ) | `[static]`

| Initializes all built-in draggers. Reimplemented from SoNode.

SbVec2f SoDragger::getNormalizedLocaterPosition | ( | void |  | ) | `[protected]`

| Returns the position of the locater.

SbVec2s SoDragger::getLocaterPosition | ( | void |  | ) | `[protected]`

| This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

SbVec2s SoDragger::getStartLocaterPosition | ( | void |  | ) | const`[protected]`

| Returns the position when mouse button 1 was pressed.

void SoDragger::setStartLocaterPosition | ( | SbVec2s | pos | ) | `[protected]`

| The start locater position is automatically set when mouse button 1 goes down, but subclasses can use this method to reset the value.

SbBool SoDragger::isAdequateConstraintMotion | ( | void |  | ) | `[protected]`

| Checks if the mouse pointer has been moved enough after the end-user hit a constraint mode key (which is typically `SHIFT`, sometimes also `CTRL` for the built-in draggers) that we should act upon and decide which direction the constraint should be set to.

SbBool SoDragger::shouldGrabBasedOnSurrogate | ( | const SoPath * | pickpath,
|  | const SoPath * | surrogatepath
| ) | `[protected, virtual]`

| Checks if pickpath contains surrogatepath and returns `TRUE` if the tail of surrogatepath is before any dragger in pickpath.

void SoDragger::setCameraInfo | ( | SoAction * | action | ) | `[protected]`

| Store data about the current camera in the given action.

void SoDragger::handleEvent | ( | SoHandleEventAction * | action | ) | `[protected, virtual]`

| Action method for SoHandleEventAction. Inspects the event data from action, and processes it if it is something which this node should react to. Nodes influencing relevant state variables for how event handling is done also overrides this method. Reimplemented from SoBaseKit.

void SoDragger::transferMotion | ( | SoDragger * | child | ) | `[protected]`

| This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

void SoDragger::setIgnoreInBbox | ( | SbBool | val | ) | `[protected]`

| Sets whether dragger geometry should be ignored when calculating bbox.

SbBool SoDragger::isIgnoreInBbox | ( | void |  | ) | `[protected]`

| Returns whether dragger geometry should be ignored when calculating bbox.

void SoDragger::getBoundingBox | ( | SoGetBoundingBoxAction * | action | ) | `[protected, virtual]`

Action method for the SoGetBoundingBoxAction.

Calculates bounding box and center coordinates for node and modifies the values of the action to encompass the bounding box for this node and to shift the center point for the scene more towards the one for this node.

Nodes influencing how geometry nodes calculates their bounding box also overrides this method to change the relevant state variables.

Reimplemented from SoBaseKit.

Reimplemented in SoCenterballDragger.

void SoDragger::setActiveChildDragger | ( | SoDragger * | childdragger | ) | `[protected]`

| This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

SoDragger * SoDragger::getActiveChildDragger | ( | void |  | ) | const`[protected]`

| This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

void SoDragger::setDefaultOnNonWritingFields | ( | void |  | ) | `[protected, virtual]`

(Be aware that this method is unlikely to be of interest to the application programmer who does not want to extend the library with new custom nodekits or draggers. If you indeed are writing extensions, see the information in the SoBaseKit class documentation.)

This is a virtual method, and the code in it should call SoField::setDefault() with argument `TRUE` on part fields that should not be written upon scenegraph export operations.

This is typically done when:

1. field value is `NULL` and part is `NULL` by default

2. it is a leaf SoGroup or SoSeparator node with no children

3. it is a leaf listpart with no children and an SoGroup or SoSeparator container

4. it is a non-leaf part and it's of SoGroup type and all fields are at their default values

Subclasses should usually override this to do additional settings for new member fields. From the subclass, do remember to call "upwards" to your superclass' setDefaultOnNonWritingFields() method.

Reimplemented from SoInteractionKit.

Reimplemented in SoCenterballDragger, SoDirectionalLightDragger, SoDragPointDragger, SoHandleBoxDragger, SoJackDragger, SoPointLightDragger, SoSpotLightDragger, SoTabBoxDragger, SoTabPlaneDragger, SoTrackballDragger, SoTransformBoxDragger, and SoTransformerDragger.

void SoDragger::childTransferMotionAndValueChangedCB | ( | void * | data,
|  | SoDragger * | child
| ) | `[static, protected]`

| This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

void SoDragger::childValueChangedCB | ( | void * | data,
|  | SoDragger * | child
| ) | `[static, protected]`

| This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

void SoDragger::childStartCB | ( | void * | data,
|  | SoDragger * | child
| ) | `[static, protected]`

| This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

void SoDragger::childMotionCB | ( | void * | data,
|  | SoDragger * | child
| ) | `[static, protected]`

| This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

void SoDragger::childFinishCB | ( | void * | data,
|  | SoDragger * | child
| ) | `[static, protected]`

| This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

void SoDragger::childOtherEventCB | ( | void * | data,
|  | SoDragger * | child
| ) | `[static, protected]`

| This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

void SoDragger::updateDraggerCache | ( | const SoPath * | path | ) | `[protected]`

| This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

## Member Data Documentation

SoSFBool SoDragger::isActive

| Is `TRUE` whenever the user is interacting with the dragger. For compound draggers (draggers consisting of one or more subdraggers), the isActive field is updated only for the active subdragger, not for the compound dragger.

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

- SoDragger.h
- SoDragger.cpp