TGLEventHandler.cxx

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// @(#)root/gl:$Id$
// Author: Bertrand Bellenot   29/01/2008

/*************************************************************************
 * Copyright (C) 1995-2008, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/

#include "TGLEventHandler.h"
#include "TGEventHandler.h"
#include "TGLViewer.h"
#include "TGLWidget.h"
#include "TGWindow.h"
#include "TPoint.h"
#include "TVirtualPad.h" // Remove when pad removed - use signal
#include "TVirtualX.h"
#include "TGClient.h"
#include "TVirtualGL.h"
#include "TGLOverlay.h"
#include "TGLLogicalShape.h"
#include "TGLPhysicalShape.h"
#include "TContextMenu.h"
#include "TGToolTip.h"
#include "KeySymbols.h"
#include "TGLAnnotation.h"
#include "TEnv.h"
#include "TMath.h"
#include "RConfigure.h"

/** \class TGLEventHandler
\ingroup opengl
Base-class and default implementation of event-handler for TGLViewer.

This allows for complete disentanglement of GL-viewer from GUI
event handling. Further, alternative event-handlers can easily be
designed and set at run-time.

The signals about object being selected or hovered above are
emitted via the TGLViewer itself.

The following rootrc settings influence the behaviour:
~~~ {.cpp}
OpenGL.EventHandler.ViewerCentricControls:  1
OpenGL.EventHandler.ArrowKeyFactor:        -1.0
OpenGL.EventHandler.MouseDragFactor:       -1.0
OpenGL.EventHandler.MouseWheelFactor:      -1.0
~~~
*/

ClassImp(TGLEventHandler);

////////////////////////////////////////////////////////////////////////////////
/// Constructor.

TGLEventHandler::TGLEventHandler(TGWindow *w, TObject *obj) :
   TGEventHandler      ("TGLEventHandler", w, obj),
   fGLViewer           ((TGLViewer *)obj),
   fMouseTimer         (0),
   fLastPos            (-1, -1),
   fLastMouseOverPos   (-1, -1),
   fLastMouseOverShape (0),
   fTooltip            (0),
   fActiveButtonID     (0),
   fLastEventState     (0),
   fIgnoreButtonUp     (kFALSE),
   fInPointerGrab      (kFALSE),
   fMouseTimerRunning  (kFALSE),
   fTooltipShown       (kFALSE),
   fArcBall            (kFALSE),
   fTooltipPixelTolerance (3),
   fSecSelType(TGLViewer::kOnRequest),
   fDoInternalSelection(kTRUE),
   fViewerCentricControls(kFALSE)
{
   fMouseTimer = new TTimer(this, 80);
   fTooltip    = new TGToolTip(0, 0, "", 650);
   fTooltip->Hide();
   fViewerCentricControls = gEnv->GetValue("OpenGL.EventHandler.ViewerCentricControls", 0) != 0;
   fArrowKeyFactor   = gEnv->GetValue("OpenGL.EventHandler.ArrowKeyFactor",   1.0);
   fMouseDragFactor  = gEnv->GetValue("OpenGL.EventHandler.MouseDragFactor",  1.0);
   fMouseWheelFactor = gEnv->GetValue("OpenGL.EventHandler.MouseWheelFactor", 1.0);
}

////////////////////////////////////////////////////////////////////////////////
/// Destructor.

TGLEventHandler::~TGLEventHandler()
{
   delete fMouseTimer;
   delete fTooltip;
}

////////////////////////////////////////////////////////////////////////////////
/// Acquire mouse grab.

void TGLEventHandler::GrabMouse()
{
   if (!fInPointerGrab)
   {
      gVirtualX->GrabPointer(fGLViewer->GetGLWidget()->GetId(),
                             kButtonPressMask | kButtonReleaseMask | kPointerMotionMask,
                             kNone, kNone, kTRUE, kFALSE);
      fInPointerGrab = kTRUE;
   }
}

////////////////////////////////////////////////////////////////////////////////
/// Release mouse grab.

void TGLEventHandler::UnGrabMouse()
{
   if (fInPointerGrab)
   {
      gVirtualX->GrabPointer(0, 0, 0, 0, kFALSE);
      fInPointerGrab = kFALSE;
   }
}

////////////////////////////////////////////////////////////////////////////////
/// Run selection (optionally with on secondary selection) and emit
/// corresponding Clicked() signals.
/// Protected method.

void TGLEventHandler::SelectForClicked(Event_t *event)
{
   fGLViewer->RequestSelect(fLastPos.fX, fLastPos.fY);

   TGLLogicalShape  *lshp = fGLViewer->fSelRec.GetLogShape();
   TObject          *obj  = fGLViewer->fSelRec.GetObject();

   // secondary selection
   if (lshp && (event->fState & kKeyMod1Mask || (fSecSelType == TGLViewer::kOnRequest && lshp->AlwaysSecondarySelect())))
   {
      fGLViewer->RequestSecondarySelect(fLastPos.fX, fLastPos.fY);
      fGLViewer->fSecSelRec.SetMultiple(event->fState & kKeyControlMask);

      lshp->ProcessSelection(*fGLViewer->fRnrCtx, fGLViewer->fSecSelRec);

      switch (fGLViewer->fSecSelRec.GetSecSelResult())
      {
         case TGLSelectRecord::kEnteringSelection:
            fGLViewer->Clicked(obj, event->fCode, event->fState);
            break;
         case TGLSelectRecord::kLeavingSelection:
            fGLViewer->UnClicked(obj, event->fCode, event->fState);
            break;
         case TGLSelectRecord::kModifyingInternalSelection:
            fGLViewer->ReClicked(obj, event->fCode, event->fState);
            break;
         default:
            break;
      }
   }
   else
   {
      fGLViewer->Clicked(obj);
      fGLViewer->Clicked(obj, event->fCode, event->fState);
   }
}

////////////////////////////////////////////////////////////////////////////////
/// Run selection (optionally with on secondary selection) and emit
/// corresponding MouseOver() signals.
/// Protected method.

void TGLEventHandler::SelectForMouseOver()
{
   fGLViewer->RequestSelect(fLastPos.fX, fLastPos.fY);

   TGLPhysicalShape *pshp = fGLViewer->fSelRec.GetPhysShape();
   TGLLogicalShape  *lshp = fGLViewer->fSelRec.GetLogShape();
   TObject          *obj  = fGLViewer->fSelRec.GetObject();

   if (lshp && (fSecSelType == TGLViewer::kOnRequest && lshp->AlwaysSecondarySelect()))
   {
      fGLViewer->RequestSecondarySelect(fLastPos.fX, fLastPos.fY);
      fGLViewer->fSecSelRec.SetMultiple(kFALSE);
      fGLViewer->fSecSelRec.SetHighlight(kTRUE);

      lshp->ProcessSelection(*fGLViewer->fRnrCtx, fGLViewer->fSecSelRec);

      fGLViewer->fSecSelRec.SetHighlight(kFALSE);

      switch (fGLViewer->fSecSelRec.GetSecSelResult())
      {
         case TGLSelectRecord::kEnteringSelection:
            fGLViewer->MouseOver(obj, fLastEventState);
            break;
         case TGLSelectRecord::kModifyingInternalSelection:
            fGLViewer->ReMouseOver(obj, fLastEventState);
            break;
         case TGLSelectRecord::kLeavingSelection:
            fGLViewer->UnMouseOver(obj, fLastEventState);
            break;
         default:
            break;
      }
   }
   else if (fLastMouseOverShape != pshp)
   {
      fGLViewer->MouseOver(pshp);
      fGLViewer->MouseOver(pshp, fLastEventState);
      fGLViewer->MouseOver(obj,  fLastEventState);
   }
   fLastMouseOverShape = pshp;
   fLastMouseOverPos   = fLastPos;
}

//==============================================================================

////////////////////////////////////////////////////////////////////////////////
/// Process event of type 'event' - one of EEventType types,
/// occurring at window location px, py
/// This is provided for use when embedding GL viewer into pad

void TGLEventHandler::ExecuteEvent(Int_t event, Int_t px, Int_t py)
{
   /*enum EEventType {
   kNoEvent       =  0,
   kButton1Down   =  1, kButton2Down   =  2, kButton3Down   =  3, kKeyDown  =  4,
   kButton1Up     = 11, kButton2Up     = 12, kButton3Up     = 13, kKeyUp    = 14,
   kButton1Motion = 21, kButton2Motion = 22, kButton3Motion = 23, kKeyPress = 24,
   kButton1Locate = 41, kButton2Locate = 42, kButton3Locate = 43,
   kMouseMotion   = 51, kMouseEnter    = 52, kMouseLeave    = 53,
   kButton1Double = 61, kButton2Double = 62, kButton3Double = 63

   enum EGEventType {
   kGKeyPress, kKeyRelease, kButtonPress, kButtonRelease,
   kMotionNotify, kEnterNotify, kLeaveNotify, kFocusIn, kFocusOut,
   kExpose, kConfigureNotify, kMapNotify, kUnmapNotify, kDestroyNotify,
   kClientMessage, kSelectionClear, kSelectionRequest, kSelectionNotify,
   kColormapNotify, kButtonDoubleClick, kOtherEvent*/

   // Map our event EEventType (base/inc/Buttons.h) back to Event_t (base/inc/GuiTypes.h)
   // structure, and call appropriate HandleXyzz() function
   Event_t eventSt = { kOtherEvent, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
                       kFALSE, 0, 0, {0, 0, 0, 0, 0} };
   eventSt.fX = px;
   eventSt.fY = py;
   eventSt.fState = 0;
   eventSt.fXRoot = eventSt.fYRoot = 0;

   if (event != kKeyPress) {
      eventSt.fY -= Int_t((1 - gPad->GetHNDC() - gPad->GetYlowNDC()) * gPad->GetWh());
      eventSt.fX -= Int_t(gPad->GetXlowNDC() * gPad->GetWw());
      eventSt.fXRoot = eventSt.fX;
      eventSt.fYRoot = eventSt.fY;
   }

   switch (event) {
      case kMouseMotion:
         eventSt.fCode = kMouseMotion;
         eventSt.fType = kMotionNotify;
         HandleMotion(&eventSt);
         break;
      case kButton1Down:
      case kButton1Up:
      {
         eventSt.fCode = kButton1;
         eventSt.fType = event == kButton1Down ? kButtonPress:kButtonRelease;
         HandleButton(&eventSt);
      }
      break;
      case kButton2Down:
      case kButton2Up:
      {
         eventSt.fCode = kButton2;
         eventSt.fType = event == kButton2Down ? kButtonPress:kButtonRelease;
         HandleButton(&eventSt);
      }
      break;
      case kButton3Down:
      {
         eventSt.fState = kKeyShiftMask;
         eventSt.fCode = kButton1;
         eventSt.fType = kButtonPress;
         HandleButton(&eventSt);
      }
      break;
      case kButton3Up:
      {
         eventSt.fCode = kButton3;
         eventSt.fType = kButtonRelease;//event == kButton3Down ? kButtonPress:kButtonRelease;
         HandleButton(&eventSt);
      }
      break;
      case kButton1Double:
      case kButton2Double:
      case kButton3Double:
      {
         eventSt.fCode = kButton1Double ? kButton1 : kButton2Double ? kButton2 : kButton3;
         eventSt.fType = kButtonDoubleClick;
         HandleDoubleClick(&eventSt);
      }
      break;
      case kButton1Motion:
      case kButton2Motion:
      case kButton3Motion:
      {

         eventSt.fCode = event == kButton1Motion ? kButton1 : event == kButton2Motion ? kButton2 : kButton3;
         eventSt.fType = kMotionNotify;
         HandleMotion(&eventSt);
      }
      break;
      case kKeyPress: // We only care about full key 'presses' not individual down/up
      {
         eventSt.fType = kGKeyPress;
         eventSt.fCode = py; // px contains key code - need modifiers from somewhere
         HandleKey(&eventSt);
      }
      break;
      case 6://trick :)
         if (fGLViewer->CurrentCamera().Zoom(+50, kFALSE, kFALSE)) { //TODO : val static const somewhere
            if (fGLViewer->fGLDevice != -1) {
               gGLManager->MarkForDirectCopy(fGLViewer->fGLDevice, kTRUE);
               gVirtualX->SetDrawMode(TVirtualX::kCopy);
            }
            fGLViewer->RequestDraw();
         }
         break;
      case 5://trick :)
         if (fGLViewer->CurrentCamera().Zoom(-50, kFALSE, kFALSE)) { //TODO : val static const somewhere
            if (fGLViewer->fGLDevice != -1) {
               gGLManager->MarkForDirectCopy(fGLViewer->fGLDevice, kTRUE);
               gVirtualX->SetDrawMode(TVirtualX::kCopy);
            }
            fGLViewer->RequestDraw();
         }
         break;
      case 7://trick :)
         eventSt.fState = kKeyShiftMask;
         eventSt.fCode = kButton1;
         eventSt.fType = kButtonPress;
         HandleButton(&eventSt);
         break;
      default:
      {
        // Error("TGLEventHandler::ExecuteEvent", "invalid event type");
      }
   }
}

////////////////////////////////////////////////////////////////////////////////
/// Handle generic Event_t type 'event' - provided to catch focus changes
/// and terminate any interaction in viewer.

Bool_t TGLEventHandler::HandleEvent(Event_t *event)
{
   if (event->fType == kFocusIn) {
      if (fGLViewer->fDragAction != TGLViewer::kDragNone) {
         Error("TGLEventHandler::HandleEvent", "active drag-action at focus-in.");
         fGLViewer->fDragAction = TGLViewer::kDragNone;
      }
      StartMouseTimer();
   }
   if (event->fType == kFocusOut) {
      if (fGLViewer->fDragAction != TGLViewer::kDragNone) {
         Warning("TGLEventHandler::HandleEvent", "drag-action active at focus-out.");
         fGLViewer->fDragAction = TGLViewer::kDragNone;
      }
      StopMouseTimer();
      ClearMouseOver();
   }

   return kTRUE;
}

////////////////////////////////////////////////////////////////////////////////
/// Handle generic Event_t type 'event' - provided to catch focus changes
/// and terminate any interaction in viewer.

Bool_t TGLEventHandler::HandleFocusChange(Event_t *event)
{
   fGLViewer->MouseIdle(0, 0, 0);
   if (event->fType == kFocusIn) {
      if (fGLViewer->fDragAction != TGLViewer::kDragNone) {
         Error("TGLEventHandler::HandleFocusChange", "active drag-action at focus-in.");
         fGLViewer->fDragAction = TGLViewer::kDragNone;
      }
      StartMouseTimer();
      fGLViewer->Activated();
   }
   if (event->fType == kFocusOut) {
      if (fGLViewer->fDragAction != TGLViewer::kDragNone) {
         Warning("TGLEventHandler::HandleFocusChange", "drag-action active at focus-out.");
         fGLViewer->fDragAction = TGLViewer::kDragNone;
      }
      StopMouseTimer();
      ClearMouseOver();
   }

   return kTRUE;
}

////////////////////////////////////////////////////////////////////////////////
/// Handle generic Event_t type 'event' - provided to catch focus changes
/// and terminate any interaction in viewer.

Bool_t TGLEventHandler::HandleCrossing(Event_t *event)
{
   // Ignore grab and ungrab events.
   if (event->fCode != 0) {
      return kTRUE;
   }

   fGLViewer->MouseIdle(0, 0, 0);
   if (event->fType == kEnterNotify) {
      if (fGLViewer->fDragAction != TGLViewer::kDragNone) {
         Error("TGLEventHandler::HandleCrossing", "active drag-action at enter-notify.");
         fGLViewer->fDragAction = TGLViewer::kDragNone;
      }
      StartMouseTimer();
      // Maybe, maybe not...
      fGLViewer->Activated();
   }
   if (event->fType == kLeaveNotify) {
      if (fGLViewer->fDragAction != TGLViewer::kDragNone) {
         Warning("TGLEventHandler::HandleCrossing", "drag-action active at leave-notify.");
         fGLViewer->fDragAction = TGLViewer::kDragNone;
      }
      StopMouseTimer();
      ClearMouseOver();
   }

   return kTRUE;
}

////////////////////////////////////////////////////////////////////////////////
/// Handle mouse button 'event'.

Bool_t TGLEventHandler::HandleButton(Event_t * event)
{
   if (fGLViewer->IsLocked()) {
      if (gDebug>2) {
         Info("TGLEventHandler::HandleButton", "ignored - viewer is %s",
              fGLViewer->LockName(fGLViewer->CurrentLock()));
      }
      return kFALSE;
   }

   // Handle mouse-wheel events first.
   if (event->fCode > kButton3)
   {
      // On Win32 only button release events come for mouse wheel.
      // Note: Modifiers (ctrl/shift) disabled as fState doesn't seem to
      // have correct modifier flags with mouse wheel under Windows.

      if (event->fType == kButtonRelease)
      {
         Bool_t redraw = kFALSE;

         Int_t zoom = TMath::Nint(fMouseWheelFactor * ControlValue(50));
         switch(event->fCode)
         {
            case kButton5: // Zoom out (dolly or adjust camera FOV).
               redraw = fGLViewer->CurrentCamera().Zoom(zoom, kFALSE, kFALSE);
               break;

            case kButton4: // Zoom in (dolly or adjust camera FOV).
               redraw = fGLViewer->CurrentCamera().Zoom(-zoom, kFALSE, kFALSE);
               break;

            case kButton6:
            case kButton7: // Ignore for now.
               break;
         }

         if (redraw)
            fGLViewer->fRedrawTimer->RequestDraw(10, TGLRnrCtx::kLODMed);
      }
      return kTRUE;
   }

   // Now we know we have Button 1 -> 3.
   // Allow a single action/button down/up pairing - block others
   if (fActiveButtonID && event->fCode != fActiveButtonID)
   {
      return kTRUE;
   }
   else
   {
      fActiveButtonID = event->fCode;
   }

#if defined(R__HAS_COCOA)
   // On osx/cocoa use cmd modifier for mouse-2 and cmd-alt for mouse-3.
   if (event->fCode == kButton1 && event->fState & kKeyMod2Mask)
   {
      event->fCode = event->fState & kKeyMod1Mask ? kButton3 : kButton2;
   }
#endif

   // Button DOWN
   if (event->fType == kButtonPress)
   {
      GrabMouse();

      fGLViewer->MouseIdle(0, 0, 0);

      fButtonPushPos.fX = event->fX;
      fButtonPushPos.fY = event->fY;

      if (fGLViewer->GetPushAction() != TGLViewer::kPushStd)
      {
         fGLViewer->RequestSelect(event->fX, event->fY);
         if (fGLViewer->fSelRec.GetN() > 0)
         {
            TGLVector3 v(event->fX, event->fY, 0.5*fGLViewer->fSelRec.GetMinZ());
            fGLViewer->CurrentCamera().WindowToViewport(v);
            v = fGLViewer->CurrentCamera().ViewportToWorld(v);
            if (fGLViewer->GetPushAction() == TGLViewer::kPushCamCenter)
            {
               fGLViewer->CurrentCamera().SetExternalCenter(kTRUE);
               fGLViewer->CurrentCamera().SetCenterVec(v.X(), v.Y(), v.Z());
            }
            else
            {
               TGLSelectRecord& rec = fGLViewer->GetSelRec();
               TObject* obj = rec.GetObject();
               TGLRect& vp = fGLViewer->CurrentCamera().RefViewport();
               Int_t    x = event->fX, y = event->fY;
               TGLUtil::PointToViewport(x, y);
               new TGLAnnotation(fGLViewer, obj->GetTitle(),
                                 x * 1.0f/vp.Width(),
                                 1 - y * 1.0f/vp.Height(), v);
            }

            fGLViewer->RequestDraw();
         }
         return kTRUE;
      }

      Bool_t handled = kFALSE;

      if (fGLViewer->fDragAction == TGLViewer::kDragNone && fGLViewer->fCurrentOvlElm)
      {
         Event_t e = *event;
         TGLUtil::PointToViewport(e.fX, e.fY);
         if (fGLViewer->fCurrentOvlElm->Handle(*fGLViewer->fRnrCtx, fGLViewer->fOvlSelRec, &e))
         {
            handled     = kTRUE;
            fGLViewer->fDragAction = TGLViewer::kDragOverlay;
            fGLViewer->RequestDraw();
         }
      }

      if ( ! handled)
      {
         switch (event->fCode)
         {
            // LEFT mouse button
            case kButton1:
            {
               fGLViewer->fDragAction = TGLViewer::kDragCameraRotate;
               if (fMouseTimer)
               {
                  fMouseTimer->TurnOff();
                  fMouseTimer->Reset();
               }
               break;
            }
            // MIDDLE mouse button
            case kButton2:
            {
               fGLViewer->fDragAction = TGLViewer::kDragCameraTruck;
               break;
            }
            // RIGHT mouse button
            case kButton3:
            {
               fGLViewer->fDragAction = TGLViewer::kDragCameraDolly;
               break;
            }
         }
      }
   }
   // Button UP
   else if (event->fType == kButtonRelease)
   {
      fActiveButtonID = 0;

      if (fInPointerGrab)
      {
         UnGrabMouse();
      }
      else
      {
         Warning("TGLEventHandler::HandleButton", "Unexpected button-release.");
      }

      if (fIgnoreButtonUp)
      {
         fIgnoreButtonUp = kFALSE;
         return kTRUE;
      }

      if (fGLViewer->GetPushAction() != TGLViewer::kPushStd)
      {
         // This should be 'tool' dependant.
         fGLViewer->fPushAction = TGLViewer::kPushStd;
         fGLViewer->RefreshPadEditor(fGLViewer);
         return kTRUE;
      }
      else if (fGLViewer->fDragAction == TGLViewer::kDragOverlay && fGLViewer->fCurrentOvlElm)
      {
         Event_t e = *event;
         TGLUtil::PointToViewport(e.fX, e.fY);
         fGLViewer->fCurrentOvlElm->Handle(*fGLViewer->fRnrCtx, fGLViewer->fOvlSelRec, &e);
         fGLViewer->OverlayDragFinished();
         if (fGLViewer->RequestOverlaySelect(event->fX, event->fY))
            fGLViewer->RequestDraw();
      }
      else if (fGLViewer->fDragAction >= TGLViewer::kDragCameraRotate &&
               fGLViewer->fDragAction <= TGLViewer::kDragCameraDolly)
      {
         fGLViewer->RequestDraw(TGLRnrCtx::kLODHigh);
      }

      fGLViewer->fDragAction = TGLViewer::kDragNone;

      if (fGLViewer->fGLDevice != -1)
      {
         gGLManager->MarkForDirectCopy(fGLViewer->fGLDevice, kFALSE);
      }

      if (event->fX == fButtonPushPos.fX && event->fY == fButtonPushPos.fY)
      {
         if (event->fCode == kButton1)
         {
            if (event->fState & kKeyShiftMask && fDoInternalSelection)
            {
               if (fGLViewer->RequestSelect(event->fX, event->fY))
               {
                  fGLViewer->ApplySelection();
               }
            }
            else
            {
               SelectForClicked(event);
            }
         }
         else if (event->fCode == kButton3)
         {
            Int_t    x, y;
            Window_t childdum;
            gVirtualX->TranslateCoordinates(fGLViewer->fGLWidget->GetId(), gClient->GetDefaultRoot()->GetId(),
                                            event->fX, event->fY, x, y, childdum);

            fGLViewer->RequestSelect(event->fX, event->fY);

            PopupContextMenu(fGLViewer->fSelRec.GetPhysShape(), event, x, y);
         }
      }

      if (event->fCode == kButton1 && fMouseTimer)
      {
         fMouseTimer->TurnOn();
      }
   }

   return kTRUE;
}

////////////////////////////////////////////////////////////////////////////////
/// Handle mouse double click 'event'.

Bool_t TGLEventHandler::HandleDoubleClick(Event_t *event)
{
   if (fGLViewer->IsLocked()) {
      if (gDebug>3) {
         Info("TGLEventHandler::HandleDoubleClick", "ignored - viewer is %s",
            fGLViewer->LockName(fGLViewer->CurrentLock()));
      }
      return kFALSE;
   }

   if (event->fCode > 3)
      return kTRUE;

   if (fActiveButtonID)
      return kTRUE;

   fActiveButtonID = event->fCode;
   GrabMouse();

   fGLViewer->MouseIdle(0, 0, 0);
   if (event->fCode == kButton1)
   {
      fGLViewer->DoubleClicked();
      if (fGLViewer->GetSelected() == 0)
         fGLViewer->SelectionChanged();
   }
   return kTRUE;
}

////////////////////////////////////////////////////////////////////////////////
/// Handle configure notify 'event' - a window resize/movement.

Bool_t TGLEventHandler::HandleConfigureNotify(Event_t *event)
{
   if (fGLViewer->IsLocked())
   {
      if (gDebug > 0) {
         Info("TGLEventHandler::HandleConfigureNotify", "ignored - viewer is %s",
            fGLViewer->LockName(fGLViewer->CurrentLock()));
      }
      return kFALSE;
   }
   if (event)
   {
      Int_t x = event->fX, y = event->fY, w = event->fWidth, h = event->fHeight;
      TGLUtil::PointToViewport(x, y, w, h);
      fGLViewer->SetViewport(x, y, w, h);
      fGLViewer->fRedrawTimer->RequestDraw(10, TGLRnrCtx::kLODMed);
   }
   return kTRUE;
}

////////////////////////////////////////////////////////////////////////////////
/// Handle window expose 'event' - show.

Bool_t TGLEventHandler::HandleExpose(Event_t * event)
{
   if (event->fCount != 0) return kTRUE;

   if (fGLViewer->IsLocked()) {
      if (gDebug > 0) {
         Info("TGLViewer::HandleExpose", "ignored - viewer is %s",
            fGLViewer->LockName(fGLViewer->CurrentLock()));
      }
      return kFALSE;
   }

   fGLViewer->fRedrawTimer->RequestDraw(20, TGLRnrCtx::kLODHigh);
   return kTRUE;
}

////////////////////////////////////////////////////////////////////////////////
/// Handle keyboard 'event'.

Bool_t TGLEventHandler::HandleKey(Event_t *event)
{
   // We only handle key-press events.
   if (event->fType == kKeyRelease)
      return kTRUE;

   if (fTooltipShown)
      fTooltip->Hide();

   fLastEventState = event->fState;

   fGLViewer->MouseIdle(0, 0, 0);
   if (fGLViewer->IsLocked()) {
      if (gDebug>3) {
         Info("TGLEventHandler::HandleKey", "ignored - viewer is %s",
              fGLViewer->LockName(fGLViewer->CurrentLock()));
      }
      return kFALSE;
   }

   char tmp[10] = {0};
   UInt_t keysym = 0;

   if (fGLViewer->fGLDevice == -1)
      gVirtualX->LookupString(event, tmp, sizeof(tmp), keysym);
   else
      keysym = event->fCode;
   fGLViewer->fRnrCtx->SetEventKeySym(keysym);

   Bool_t handled = kFALSE;
   Bool_t redraw  = kFALSE;

   if (fGLViewer->fCurrentOvlElm)
   {
      Event_t e = *event;
      TGLUtil::PointToViewport(e.fX, e.fY);
      if (fGLViewer->fCurrentOvlElm->Handle(*fGLViewer->fRnrCtx, fGLViewer->fOvlSelRec, &e))
      {
         handled = kTRUE;
         redraw  = kTRUE;
      }
   }

   if ( ! handled)
   {
      const Bool_t mod1 = event->fState & kKeyControlMask;
      const Bool_t mod2 = event->fState & kKeyShiftMask;

      const Int_t shift = TMath::Nint(fArrowKeyFactor * ControlValue(10));

      switch (keysym)
      {
         case kKey_R:
         case kKey_r:
            fGLViewer->SetStyle(TGLRnrCtx::kFill);
            redraw = kTRUE;
            break;
         case kKey_E:
         case kKey_e:
            fGLViewer->SwitchColorSet();
            redraw = kTRUE;
            break;
         case kKey_W:
         case kKey_w:
            fGLViewer->SetStyle(TGLRnrCtx::kWireFrame);
            redraw = kTRUE;
            break;
         case kKey_T:
         case kKey_t:
            fGLViewer->SetStyle(TGLRnrCtx::kOutline);
            redraw = kTRUE;
            break;

         case kKey_F1:
            fGLViewer->RequestSelect(fLastPos.fX, fLastPos.fY);
            fGLViewer->MouseIdle(fGLViewer->fSelRec.GetPhysShape(), (UInt_t)fLastPos.fX, (UInt_t)fLastPos.fY);
            break;

            // Camera
         case kKey_A:
         case kKey_a:
            fArcBall = ! fArcBall;
            break;
         case kKey_Plus:
         case kKey_J:
         case kKey_j:
            redraw = fGLViewer->CurrentCamera().Dolly(shift, mod1, mod2);
            break;
         case kKey_Minus:
         case kKey_K:
         case kKey_k:
            redraw = fGLViewer->CurrentCamera().Dolly(-shift, mod1, mod2);
            break;
         case kKey_Up:
            redraw = fGLViewer->CurrentCamera().Truck(0, shift, mod1, mod2);
            break;
         case kKey_Down:
            redraw = fGLViewer->CurrentCamera().Truck(0, -shift, mod1, mod2);
            break;
         case kKey_Left:
            redraw = fGLViewer->CurrentCamera().Truck(-shift, 0, mod1, mod2);
            break;
         case kKey_Right:
            redraw = fGLViewer->CurrentCamera().Truck(shift, 0, mod1, mod2);
            break;
         case kKey_Home:
            if (mod1) {
               TGLCamera &cam = fGLViewer->CurrentCamera();
               cam.SetExternalCenter(!cam.GetExternalCenter());
               fGLViewer->RefreshPadEditor(fGLViewer);
            } else {
               fGLViewer->ResetCurrentCamera();
            }
            redraw = kTRUE;
            break;

            // Toggle debugging mode
         case kKey_d:
            fGLViewer->fDebugMode = !fGLViewer->fDebugMode;
            redraw = kTRUE;
            Info("OpenGL viewer debug mode : ", fGLViewer->fDebugMode ? "ON" : "OFF");
            break;
            // Forced rebuild for debugging mode
         case kKey_D:
            if (fGLViewer->fDebugMode) {
               Info("OpenGL viewer FORCED rebuild", " ");
               fGLViewer->UpdateScene();
            }
         default:;
      } // switch
   }

   if (redraw) {
      if (fGLViewer->fGLDevice != -1)
         gGLManager->MarkForDirectCopy(fGLViewer->fGLDevice, kTRUE);
      fGLViewer->RequestDraw();
   }

   return kTRUE;
}

////////////////////////////////////////////////////////////////////////////////
/// Handle mouse motion 'event'.

Bool_t TGLEventHandler::HandleMotion(Event_t * event)
{
   fGLViewer->MouseIdle(0, 0, 0);
   if (fGLViewer->IsLocked()) {
      if (gDebug>3) {
         Info("TGLEventHandler::HandleMotion", "ignored - viewer is %s",
              fGLViewer->LockName(fGLViewer->CurrentLock()));
      }
      return kFALSE;
   }

   Bool_t processed = kFALSE, changed = kFALSE;
   Short_t lod = TGLRnrCtx::kLODMed;

   // Camera interface requires GL coords - Y inverted
   Int_t  xDelta = TMath::Nint(fMouseDragFactor * ControlValue(event->fX - fLastPos.fX));
   Int_t  yDelta = TMath::Nint(fMouseDragFactor * ControlValue(event->fY - fLastPos.fY));
   Bool_t mod1   = event->fState & kKeyControlMask;
   Bool_t mod2   = event->fState & kKeyShiftMask;
   TGLUtil::PointToViewport(xDelta, yDelta);

   if (fMouseTimerRunning) StopMouseTimer();

   if (fTooltipShown &&
       ( TMath::Abs(event->fXRoot - fTooltipPos.fX) > fTooltipPixelTolerance ||
         TMath::Abs(event->fYRoot - fTooltipPos.fY) > fTooltipPixelTolerance ))
   {
      RemoveTooltip();
   }

   if (fGLViewer->fDragAction == TGLViewer::kDragNone)
   {
      if (fGLViewer->fRedrawTimer->IsPending()) {
         if (gDebug > 2)
            Info("TGLEventHandler::HandleMotion", "Redraw pending, ignoring.");
         return kTRUE;
      }
      changed = fGLViewer->RequestOverlaySelect(event->fX, event->fY);
      if (fGLViewer->fCurrentOvlElm)
      {
         Event_t e = *event;
         TGLUtil::PointToViewport(e.fX, e.fY);
         processed = fGLViewer->fCurrentOvlElm->Handle(*fGLViewer->fRnrCtx, fGLViewer->fOvlSelRec, &e);
      }
      lod = TGLRnrCtx::kLODHigh;
      if ( ! processed && ! fMouseTimerRunning)
         StartMouseTimer();
   }
   else if (fGLViewer->fDragAction == TGLViewer::kDragCameraRotate)
   {
      processed = Rotate(xDelta, yDelta, mod1, mod2);
   }
   else if (fGLViewer->fDragAction == TGLViewer::kDragCameraTruck)
   {
      processed = fGLViewer->CurrentCamera().Truck(xDelta, -yDelta, mod1, mod2);
   }
   else if (fGLViewer->fDragAction == TGLViewer::kDragCameraDolly)
   {
      processed = fGLViewer->CurrentCamera().Dolly(yDelta - xDelta, mod1, mod2);
   }
   else if (fGLViewer->fDragAction == TGLViewer::kDragOverlay)
   {
      if (fGLViewer->fCurrentOvlElm) {
         Event_t e = *event;
         TGLUtil::PointToViewport(e.fX, e.fY);
         processed = fGLViewer->fCurrentOvlElm->Handle(*fGLViewer->fRnrCtx, fGLViewer->fOvlSelRec, &e);
      }
   }

   fLastPos.fX = event->fX;
   fLastPos.fY = event->fY;

   fLastGlobalPos.fX = event->fXRoot;
   fLastGlobalPos.fY = event->fYRoot;

   if (processed || changed) {
      if (fGLViewer->fGLDevice != -1) {
         gGLManager->MarkForDirectCopy(fGLViewer->fGLDevice, kTRUE);
         gVirtualX->SetDrawMode(TVirtualX::kCopy);
      }

      fGLViewer->RequestDraw(lod);
   }

   return processed;
}

////////////////////////////////////////////////////////////////////////////////
/// Method to handle action TGLViewer::kDragCameraRotate.

Bool_t TGLEventHandler::Rotate(Int_t xDelta, Int_t yDelta, Bool_t mod1, Bool_t mod2)
{
   TGLCamera &cam = fGLViewer->CurrentCamera();
   if (fArcBall) return cam.RotateArcBall(xDelta, -yDelta, mod1, mod2);
   else          return cam.Rotate       (xDelta, -yDelta, mod1, mod2);
}

////////////////////////////////////////////////////////////////////////////////
/// If mouse delay timer times out emit signal.

Bool_t TGLEventHandler::HandleTimer(TTimer *t)
{
   if (t != fMouseTimer) return kFALSE;

   fMouseTimerRunning = kFALSE;

   if (fGLViewer->fRedrawTimer->IsPending()) {
      if (gDebug > 2)
         Info("TGLEventHandler::HandleTimer", "Redraw pending, ignoring.");
      return kTRUE;
   }

   if (fGLViewer->fDragAction == TGLViewer::kDragNone)
   {
      if (fLastMouseOverPos != fLastPos)
      {
         SelectForMouseOver();
      }
   }
   return kTRUE;
}

////////////////////////////////////////////////////////////////////////////////
/// Start mouse timer in single-shot mode.

void TGLEventHandler::StartMouseTimer()
{
   fMouseTimer->Start(-1, kTRUE);
   fMouseTimerRunning = kTRUE;
}

////////////////////////////////////////////////////////////////////////////////
/// Make sure mouse timers are not running.

void TGLEventHandler::StopMouseTimer()
{
   fMouseTimerRunning = kFALSE;
   fMouseTimer->Stop();
}

////////////////////////////////////////////////////////////////////////////////
/// Clear mouse-over state and emit mouse-over signals.
/// Current overlay element is also told the mouse has left.

void TGLEventHandler::ClearMouseOver()
{
   fLastMouseOverPos.fX = fLastMouseOverPos.fY = -1;
   fLastMouseOverShape = 0;
   fGLViewer->MouseOver(fLastMouseOverShape);
   fGLViewer->MouseOver(fLastMouseOverShape, fLastEventState);
   fGLViewer->MouseOver((TObject*)0, fLastEventState);

   fGLViewer->ClearCurrentOvlElm();
}

////////////////////////////////////////////////////////////////////////////////
/// Handle window expose 'event' - show.

void TGLEventHandler::Repaint()
{
   if (fGLViewer->IsLocked()) {
      if (gDebug > 0) {
         Info("TGLViewer::HandleExpose", "ignored - viewer is %s",
            fGLViewer->LockName(fGLViewer->CurrentLock()));
      }
      return;
   }
   fGLViewer->fRedrawTimer->RequestDraw(20, TGLRnrCtx::kLODHigh);
}

////////////////////////////////////////////////////////////////////////////////
/// Popup context menu.

void TGLEventHandler::PopupContextMenu(TGLPhysicalShape* pshp, Event_t * /*event*/,
                                       Int_t gx, Int_t gy)
{
   if (!fGLViewer->fContextMenu)
   {
      fGLViewer->fContextMenu = new TContextMenu("glcm", "GL Viewer Context Menu");
   }

   if (pshp)
   {
      fActiveButtonID = 0;
      UnGrabMouse();

      pshp->InvokeContextMenu(*fGLViewer->fContextMenu, gx, gy);
   }

   // This is dangerous ... should have special menu, probably even
   // tool / context specific.
   // else
   // {
   //    fGLViewer->fContextMenu->Popup(x, y, fGLViewer);
   // }
}

////////////////////////////////////////////////////////////////////////////////
/// Trigger display of tooltip.

void TGLEventHandler::TriggerTooltip(const char* text)
{
   static UInt_t screenW = 0, screenH = 0;
   fTooltipPos   = fLastGlobalPos;
   fTooltipShown = kTRUE;
   fTooltip->SetText(text);
   Int_t x = fTooltipPos.fX + 16, y = fTooltipPos.fY + 16;
   if (screenW == 0 || screenH == 0) {
      screenW = gClient->GetDisplayWidth();
      screenH = gClient->GetDisplayHeight();
   }
   if (x + 5 + fTooltip->GetWidth() > screenW) {
      x = screenW - fTooltip->GetWidth() - 5;
      if (y + 5 + fTooltip->GetHeight() > screenH) {
         y -= (25 + fTooltip->GetHeight());
      }
   }
   if (y + 5 + fTooltip->GetHeight() > screenH) {
      y = screenH - fTooltip->GetHeight() - 10;
   }
   fTooltip->SetPosition(x, y);
   fTooltip->Reset();
}

////////////////////////////////////////////////////////////////////////////////
/// Hide the tooltip.

void TGLEventHandler::RemoveTooltip()
{
   fTooltip->Hide();
   fTooltipShown = kFALSE;
}

////////////////////////////////////////////////////////////////////////////////
/// Set delay of mouse-over probe (highlight).

void TGLEventHandler::SetMouseOverSelectDelay(Int_t ms)
{
   fMouseTimer->SetTime(ms);
}

////////////////////////////////////////////////////////////////////////////////
/// Set delay of tooltip timer.

void TGLEventHandler::SetMouseOverTooltipDelay(Int_t ms)
{
   fTooltip->SetDelay(ms);
}