OpenBoard/src/board/UBBoardView.cpp

/*
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#include "UBBoardView.h"

#include <QtGui>
#include <QtXml>
#include <QListView>

#include "UBDrawingController.h"

#include "frameworks/UBGeometryUtils.h"
#include "frameworks/UBPlatformUtils.h"

#include "core/UBSettings.h"
#include "core/UBMimeData.h"
#include "core/UBApplication.h"
#include "core/UBSetting.h"
#include "core/UBPersistenceManager.h"

#include "network/UBHttpGet.h"

#include "gui/UBStylusPalette.h"
#include "gui/UBRubberBand.h"
#include "gui/UBToolWidget.h"
#include "gui/UBResources.h"
#include "gui/UBMainWindow.h"
#include "gui/UBThumbnailWidget.h"
#include "gui/UBTeacherGuideWidgetsTools.h"

#include "board/UBBoardController.h"
#include "board/UBBoardPaletteManager.h"

#include "domain/UBGraphicsTextItem.h"
#include "domain/UBGraphicsPixmapItem.h"
#include "domain/UBGraphicsWidgetItem.h"
#include "domain/UBGraphicsPDFItem.h"
#include "domain/UBGraphicsPolygonItem.h"
#include "domain/UBItem.h"
#include "domain/UBGraphicsMediaItem.h"
#include "domain/UBGraphicsSvgItem.h"
#include "domain/UBGraphicsGroupContainerItem.h"
#include "domain/UBGraphicsStrokesGroup.h"

#include "document/UBDocumentProxy.h"

#include "tools/UBGraphicsCompass.h"
#include "tools/UBGraphicsCache.h"
#include "tools/UBGraphicsTriangle.h"
#include "tools/UBGraphicsProtractor.h"

#include "core/memcheck.h"

UBBoardView::UBBoardView (UBBoardController* pController, QWidget* pParent, bool pIsControl)
: QGraphicsView (pParent)
, mController (pController)
, mIsCreatingTextZone (false)
, mIsCreatingSceneGrabZone (false)
, mOkOnWidget(false)
, suspendedMousePressEvent(NULL)
, mLongPressInterval(1000)
, mIsDragInProgress(false)
, mMultipleSelectionIsEnabled(false)
, isControl(pIsControl)
{
  init ();

  mFilterZIndex = false;

  mLongPressTimer.setInterval(mLongPressInterval);
  mLongPressTimer.setSingleShot(true);
}

UBBoardView::UBBoardView (UBBoardController* pController, int pStartLayer, int pEndLayer, QWidget* pParent, bool pIscontrol)
: QGraphicsView (pParent)
, mController (pController)
, suspendedMousePressEvent(NULL)
, mLongPressInterval(1000)
, mIsDragInProgress(false)
, mMultipleSelectionIsEnabled(false)
, isControl(pIscontrol)
{
  init ();

  mStartLayer = pStartLayer;
  mEndLayer = pEndLayer;

  mFilterZIndex = true;  

  mLongPressTimer.setInterval(mLongPressInterval);
  mLongPressTimer.setSingleShot(true);
}

UBBoardView::~UBBoardView () {
  //NOOP
    if (suspendedMousePressEvent)
        delete suspendedMousePressEvent;
}

void UBBoardView::init ()
{
  connect (UBSettings::settings ()->boardPenPressureSensitive, SIGNAL (changed (QVariant)),
           this, SLOT (settingChanged (QVariant)));

  connect (UBSettings::settings ()->boardMarkerPressureSensitive, SIGNAL (changed (QVariant)),
           this, SLOT (settingChanged (QVariant)));

  connect (UBSettings::settings ()->boardUseHighResTabletEvent, SIGNAL (changed (QVariant)),
           this, SLOT (settingChanged (QVariant)));

  setWindowFlags (Qt::FramelessWindowHint);
  setFrameStyle (QFrame::NoFrame);
  setRenderHints (QPainter::Antialiasing | QPainter::SmoothPixmapTransform | QPainter::TextAntialiasing);
  setVerticalScrollBarPolicy (Qt::ScrollBarAlwaysOff);
  setHorizontalScrollBarPolicy (Qt::ScrollBarAlwaysOff);
  setAcceptDrops (true);

  setOptimizationFlag (QGraphicsView::IndirectPainting); // enable UBBoardView::drawItems filter

  mTabletStylusIsPressed = false;
  mMouseButtonIsPressed = false;
  mPendingStylusReleaseEvent = false;

  setCacheMode (QGraphicsView::CacheBackground);

  mUsingTabletEraser = false;
  mIsCreatingTextZone = false;
  mRubberBand = 0;
  mUBRubberBand = 0;

  mVirtualKeyboardActive = false;

  settingChanged (QVariant ());

  unsetCursor();

  movingItem = NULL;
  mWidgetMoved = false;
}

UBGraphicsScene*
UBBoardView::scene ()
{
  return qobject_cast<UBGraphicsScene*> (QGraphicsView::scene ());
}

void
UBBoardView::hideEvent (QHideEvent * event)
{
  Q_UNUSED (event);
  emit hidden ();
}

void
UBBoardView::showEvent (QShowEvent * event)
{
  Q_UNUSED (event);
  emit shown ();
}

void
UBBoardView::keyPressEvent (QKeyEvent *event)
{
  // send to the scene anyway
  QApplication::sendEvent (scene (), event);

  if (!event->isAccepted ())
    {
      switch (event->key ())
        {
        case Qt::Key_Up:
        case Qt::Key_PageUp:
        case Qt::Key_Left:
          {
            mController->previousScene ();
            break;
          }

        case Qt::Key_Down:
        case Qt::Key_PageDown:
        case Qt::Key_Right:
        case Qt::Key_Space:
          {
            mController->nextScene ();
            break;
          }

        case Qt::Key_Home:
          {
            mController->firstScene ();
            break;
          }
        case Qt::Key_End:
          {
            mController->lastScene ();
            break;
          }
        case Qt::Key_Insert:
          {
            mController->addScene ();
            break;
          }
        case Qt::Key_Control:
        case Qt::Key_Shift:
          {
            setMultiselection(true);
          }break;
        }


      if (event->modifiers () & Qt::ControlModifier) // keep only ctrl/cmd keys
        {
          switch (event->key ())
            {
            case Qt::Key_Plus:
            case Qt::Key_I:
              {
                mController->zoomIn ();
                event->accept ();
                break;
              }
            case Qt::Key_Minus:
            case Qt::Key_O:
              {
                mController->zoomOut ();
                event->accept ();
                break;
              }
            case Qt::Key_0:
              {
                mController->zoomRestore ();
                event->accept ();
                break;
              }
            case Qt::Key_Left:
              {
                mController->handScroll (-100, 0);
                event->accept ();
                break;
              }
            case Qt::Key_Right:
              {
                mController->handScroll (100, 0);
                event->accept ();
                break;
              }
            case Qt::Key_Up:
              {
                mController->handScroll (0, -100);
                event->accept ();
                break;
              }
            case Qt::Key_Down:
              {
                mController->handScroll (0, 100);
                event->accept ();
                break;
              }
            default:
              {
                // NOOP
              }
            }
        }
    }

    // if ctrl of shift was pressed combined with other keys - we need to disable multiple selection.
    if (event->isAccepted())
        setMultiselection(false);
}


void UBBoardView::keyReleaseEvent(QKeyEvent *event)
{
   // if (!event->isAccepted ())
    {    
        if (Qt::Key_Shift == event->key()
          ||Qt::Key_Control == event->key())
        {
            setMultiselection(false);
        }
    }

    QGraphicsView::keyReleaseEvent(event);
}

bool
UBBoardView::event (QEvent * e)
{
  if (e->type () == QEvent::Gesture)
    {
      QGestureEvent *gestureEvent = dynamic_cast<QGestureEvent *> (e);
      if (gestureEvent)
        {
          QSwipeGesture* swipe = dynamic_cast<QSwipeGesture*> (gestureEvent->gesture (Qt::SwipeGesture));

          if (swipe)
            {
              if (swipe->horizontalDirection () == QSwipeGesture::Left)
                {
                  mController->previousScene ();
                  gestureEvent->setAccepted (swipe, true);
                }

              if (swipe->horizontalDirection () == QSwipeGesture::Right)
                {
                  mController->nextScene ();
                  gestureEvent->setAccepted (swipe, true);
                }
            }
        }
    }

  return QGraphicsView::event (e);
}

void UBBoardView::tabletEvent (QTabletEvent * event)
{
    if (!mUseHighResTabletEvent) {
        event->setAccepted (false);
        return;
    }

    UBDrawingController *dc = UBDrawingController::drawingController ();

    QPointF tabletPos = event->pos();
    UBStylusTool::Enum currentTool = (UBStylusTool::Enum)dc->stylusTool ();

    if (event->type () == QEvent::TabletPress || event->type () == QEvent::TabletEnterProximity) {
        if (event->pointerType () == QTabletEvent::Eraser) {
            dc->setStylusTool (UBStylusTool::Eraser);
            mUsingTabletEraser = true;
        }
        else {
            if (mUsingTabletEraser && currentTool == UBStylusTool::Eraser)
                dc->setStylusTool (dc->latestDrawingTool ());

            mUsingTabletEraser = false;
        }
    }

    // if event are not Pen events, we drop the tablet stuff and route everything through mouse event
    if (currentTool != UBStylusTool::Pen && currentTool != UBStylusTool::Line && currentTool != UBStylusTool::Marker && !mMarkerPressureSensitive){
        event->setAccepted (false);
        return;
    }

    QPointF scenePos = viewportTransform ().inverted ().map (tabletPos);

    qreal pressure = 1.0;
    if (((currentTool == UBStylusTool::Pen || currentTool == UBStylusTool::Line)
         && mPenPressureSensitive)
            || (currentTool == UBStylusTool::Marker && mMarkerPressureSensitive))
        pressure = event->pressure ();


    bool acceptEvent = true;

    switch (event->type ()) {
    case QEvent::TabletPress: {
        mTabletStylusIsPressed = true;
        scene()->inputDevicePress (scenePos, pressure);

        break;
    }
    case QEvent::TabletMove: {
        if (mTabletStylusIsPressed)
            scene ()->inputDeviceMove (scenePos, pressure);

        acceptEvent = false; // rerouted to mouse move

        break;

    }
    case QEvent::TabletRelease: {
        UBStylusTool::Enum currentTool = (UBStylusTool::Enum)dc->stylusTool ();
        scene ()->setToolCursor (currentTool);
        setToolCursor (currentTool);

        scene ()->inputDeviceRelease ();

        mPendingStylusReleaseEvent = false;

        mTabletStylusIsPressed = false;
        mMouseButtonIsPressed = false;

        break;
    }
    default: {
        //NOOP - avoid compiler warning
    }
    }

    // ignore mouse press and mouse move tablet event so that it is rerouted to mouse events,
    // documented in QTabletEvent Class Reference:
    /* The event handler QWidget::tabletEvent() receives all three types of tablet events.
     Qt will first send a tabletEvent then, if it is not accepted, it will send a mouse event. */
    //
    // This is a workaround to the fact that tablet event are not delivered to child widget (like palettes)
    //

    event->setAccepted (acceptEvent);

}

bool UBBoardView::itemIsLocked(QGraphicsItem *item)
{
    if (!item)
        return false;

    return item->data(UBGraphicsItemData::ItemLocked).toBool();
}

bool UBBoardView::itemHaveParentWithType(QGraphicsItem *item, int type)
{
    if (!item)
        return false;

    if (type == item->type())
        return true;
    
    return itemHaveParentWithType(item->parentItem(), type);

}

void UBBoardView::handleItemsSelection(QGraphicsItem *item)
{
// we need to select new pressed itemOnBoard and deselect all other items.
// the trouble is in: 
//                  some items can has parents (groupped items or strokes, or strokes in groups).
//                  some items is already selected and we don't need to reselect them
//
// item selection managed by QGraphicsView::mousePressEvent(). It should be called later.

    if (item)
    {
        //  item has group as first parent - it is any item or UBGraphicsStrokesGroup.
        if(item->parentItem() && UBGraphicsGroupContainerItem::Type == movingItem->parentItem()->type())
            return;
            
        // delegate buttons shouldn't selected
        if (DelegateButton::Type == item->type())
            return;
        
        // click on svg items (images on Frame) shouldn't change selection.
        if (QGraphicsSvgItem::Type == item->type())
            return;

        // Delegate frame shouldn't selected
        if (UBGraphicsDelegateFrame::Type == item->type())
            return;
    
        
        // if we need to uwe multiple selection - we shouldn't deselect other items.
        if (!isMultipleSelectionEnabled())
        {
            // here we need to determine what item is pressed. We should work
            // only with UB items.
            if ((UBGraphicsItemType::UserTypesCount > item->type()) && (item->type() > QGraphicsItem::UserType))
            {
                // if Item can be selected at mouse press - then we need to deselect all other items.
                foreach(QGraphicsItem *iter_item, scene()->selectedItems())
                {
                    if (iter_item != item)
                    {
                        iter_item->setSelected(false);
                    }
                }
            }
        }
    }
}

bool UBBoardView::itemShouldReceiveMousePressEvent(QGraphicsItem *item)
{
/*
Some items should receive mouse press events averytime, 
some items should receive that events when they are selected, 
some items shouldn't receive mouse press events at mouse press, but should receive them at mouse release (suspended mouse press event)

Here we determines cases when items should to get mouse press event at pressing on mouse.
*/

    if (!item)
        return true;

    // for now background objects is not interactable, but it can be deprecated for some items in the future.
    if (item == scene()->backgroundObject())
        return false;

    // some behavior depends on current tool.
    UBStylusTool::Enum currentTool = (UBStylusTool::Enum)UBDrawingController::drawingController()->stylusTool();

    switch(item->type())
    {
    case UBGraphicsDelegateFrame::Type:
    case QGraphicsSvgItem::Type:
        return true;

    case DelegateButton::Type:
    case UBGraphicsMediaItem::Type:
        return false;

    case UBGraphicsSvgItem::Type:
    case UBGraphicsPixmapItem::Type:
    case UBGraphicsTextItem::Type:
        if ((currentTool == UBStylusTool::Selector) && item->isSelected())
            return true;
        if ((currentTool == UBStylusTool::Selector) && item->parentItem() && item->parentItem()->isSelected())
            return true;
        if (currentTool != UBStylusTool::Selector)
            return false;
        break;

    // Groups shouldn't reacts on any presses and moves for Play tool.
    case UBGraphicsGroupContainerItem::Type:
        if(currentTool == UBStylusTool::Play)
        {
            movingItem = NULL;
            return false;
        }
        else
            return true;
        break;

    case QGraphicsWebView::Type:
    case UBGraphicsWidgetItem::Type:
        if (currentTool == UBStylusTool::Selector && item->parentItem() && item->parentItem()->isSelected()) 
            return true;
        if (currentTool == UBStylusTool::Selector && item->isSelected()) 
            return true;
        if (currentTool == UBStylusTool::Play)
            return true;
        break;
    }

    return false;
}

bool UBBoardView::itemShouldReceiveSuspendedMousePressEvent(QGraphicsItem *item)
{
    if (!item) 
        return false;

    if (item == scene()->backgroundObject())
        return false;

    UBStylusTool::Enum currentTool = (UBStylusTool::Enum)UBDrawingController::drawingController()->stylusTool();
   
    switch(item->type())
    {
    case UBGraphicsPixmapItem::Type:
    case UBGraphicsTextItem::Type:
    case UBGraphicsWidgetItem::Type:
        if (currentTool == UBStylusTool::Selector && !item->isSelected() && item->parentItem())
            return true;
        if (currentTool == UBStylusTool::Selector && item->isSelected())
            return true;
        break;
    
    case DelegateButton::Type:
    case UBGraphicsMediaItem::Type:
        return true;
    }

    if (!dynamic_cast<UBGraphicsItem*>(item))
        return true;
    else
        return false;
}

bool UBBoardView::itemShouldBeMoved(QGraphicsItem *item)
{
    if (!item) 
        return false;

    if (item == scene()->backgroundObject())
        return false;

    if (!(mMouseButtonIsPressed || mTabletStylusIsPressed))
        return false;
        
    if (movingItem->data(UBGraphicsItemData::ItemLocked).toBool())
        return false;

    if (movingItem->parentItem() && UBGraphicsGroupContainerItem::Type == movingItem->parentItem()->type() && !movingItem->isSelected() && movingItem->parentItem()->isSelected())
        return false;

    UBStylusTool::Enum currentTool = (UBStylusTool::Enum)UBDrawingController::drawingController()->stylusTool();  
   
    switch(item->type())
    {
    case UBGraphicsGroupContainerItem::Type:
        return true;

    case UBGraphicsW3CWidgetItem::Type:
        if(currentTool == UBStylusTool::Selector && item->isSelected()) 
            return false;
        if(currentTool == UBStylusTool::Play)
            return false;

    case UBGraphicsSvgItem::Type:
    case UBGraphicsPixmapItem::Type:
        if (item->isSelected())
            return false;
    case UBGraphicsMediaItem::Type:
    case UBGraphicsStrokesGroup::Type: 
        return true;
    case UBGraphicsTextItem::Type:
        return !item->isSelected();
    }

    return false;
}


QGraphicsItem* UBBoardView::determineItemToPress(QGraphicsItem *item)
{
    if(item)
    {
        UBStylusTool::Enum currentTool = (UBStylusTool::Enum)UBDrawingController::drawingController()->stylusTool();  

        // groups should should be moved instead of strokes groups
        if (item->parentItem() && UBGraphicsStrokesGroup::Type == item->type())
            return item->parentItem();
        
        // if item is on group and froup is not selected - group should take press.
        if (UBStylusTool::Selector == currentTool && item->parentItem() && UBGraphicsGroupContainerItem::Type == item->parentItem()->type() && !item->parentItem()->isSelected()) 
            return item->parentItem();

        // items like polygons placed in two groups nested, so we need to recursive call.
        if(item->parentItem() && UBGraphicsStrokesGroup::Type == item->parentItem()->type())
            return determineItemToPress(item->parentItem());
    }

    return item;
}

// determine item to interacts: item self or it's container.
QGraphicsItem* UBBoardView::determineItemToMove(QGraphicsItem *item)
{
    if(item)
    {
        UBStylusTool::Enum currentTool = (UBStylusTool::Enum)UBDrawingController::drawingController()->stylusTool();  

        //W3C widgets should take mouse move events from play tool.
        if ((UBStylusTool::Play == currentTool) && (UBGraphicsW3CWidgetItem::Type == item->type()))
                return item;

        // if item is in group
        if(item->parentItem() && UBGraphicsGroupContainerItem::Type == item->parentItem()->type())
        {
            // play tool should move groups by any element
            if (UBStylusTool::Play == currentTool && item->parentItem()->isSelected())
                return item->parentItem();

            // groups should should be moved instead of strokes groups
            if (UBGraphicsStrokesGroup::Type == item->type())
                return item->parentItem();

            // selected groups should be moved by moving any element
            if (item->parentItem()->isSelected())
                return item;
                  
            if (item->isSelected())
                return NULL;

            return item->parentItem();
        }

        // items like polygons placed in two groups nested, so we need to recursive call.
        if(item->parentItem() && UBGraphicsStrokesGroup::Type == item->parentItem()->type())    
            return determineItemToMove(item->parentItem());
    }

    return item;
}

void UBBoardView::handleItemMousePress(QMouseEvent *event)
{
    mLastPressedMousePos = mapToScene(event->pos());

    // Determining item who will take mouse press event 
    //all other items will be deselected and if all item will be deselected, then
    // wrong item can catch mouse press. because selected items placed on the top
    QGraphicsItem *pressedItem = determineItemToPress(movingItem);

    handleItemsSelection(movingItem);

    if (isMultipleSelectionEnabled())
        return;

    if (itemShouldReceiveMousePressEvent(movingItem))
    {
        QGraphicsView::mousePressEvent (event);
    }
    else
    {
        if (movingItem)
            movingItem->clearFocus();

        if (suspendedMousePressEvent)
        {
            delete suspendedMousePressEvent;
            suspendedMousePressEvent = NULL;
        }
    
        if (itemShouldReceiveSuspendedMousePressEvent(movingItem))
        {
            suspendedMousePressEvent = new QMouseEvent(event->type(), event->pos(), event->button(), event->buttons(), event->modifiers());
        }
    }
}

void UBBoardView::handleItemMouseMove(QMouseEvent *event)
{
    // determine item to move (maybee we need to move group of item or his parent.
    movingItem = determineItemToMove(movingItem);

    // items should be moved not every mouse move.
    if (movingItem && itemShouldBeMoved(movingItem) && (mMouseButtonIsPressed || mTabletStylusIsPressed))       
    {
        QPointF scenePos = mapToScene(event->pos());
        QPointF newPos = movingItem->pos() + scenePos - mLastPressedMousePos;
        movingItem->setPos(newPos);
        mLastPressedMousePos = scenePos;
        mWidgetMoved = true;
        event->accept();
    }
    else 
    {
        QPointF posBeforeMove;
        QPointF posAfterMove;

        if (movingItem)
            posBeforeMove = movingItem->pos();

        QGraphicsView::mouseMoveEvent (event);

        if (movingItem)
          posAfterMove = movingItem->pos();

        mWidgetMoved = ((posAfterMove-posBeforeMove).manhattanLength() != 0);

        // a cludge for terminate moving of w3c widgets.
        // in some cases w3c widgets catches mouse move and doesn't sends that events to web page, 
        // at simple - in google map widget - mouse move events doesn't comes to web page from rectangle of wearch bar on bottom right corner of widget.
        if (mWidgetMoved && UBGraphicsW3CWidgetItem::Type == movingItem->type())
            movingItem->setPos(posBeforeMove);

    }
}

void UBBoardView::rubberItems()
{
    if (mUBRubberBand)
        mRubberedItems = items(mUBRubberBand->geometry());

    foreach(QGraphicsItem *item, mRubberedItems)
    {
        if (item->parentItem() && UBGraphicsGroupContainerItem::Type == item->parentItem()->type())
            mRubberedItems.removeOne(item);
    }
}

void UBBoardView::moveRubberedItems(QPointF movingVector)
{
    QRectF invalidateRect = scene()->itemsBoundingRect();

    foreach (QGraphicsItem *item, mRubberedItems) 
    {

        if (item->type() == UBGraphicsW3CWidgetItem::Type
              || item->type() == UBGraphicsPixmapItem::Type
              || item->type() == UBGraphicsMediaItem::Type
              || item->type() == UBGraphicsSvgItem::Type
              || item->type() == UBGraphicsTextItem::Type
              || item->type() == UBGraphicsStrokesGroup::Type
              || item->type() == UBGraphicsGroupContainerItem::Type) 
        {
              item->setPos(item->pos()+movingVector);       
        }    
    }

    scene()->invalidate(invalidateRect);
}

void UBBoardView::setMultiselection(bool enable)
{
    mMultipleSelectionIsEnabled = enable;
}

void UBBoardView::longPressEvent()
{
   UBDrawingController *drawingController = UBDrawingController::drawingController();
   UBStylusTool::Enum currentTool = (UBStylusTool::Enum)UBDrawingController::drawingController ()->stylusTool ();

   
   disconnect(&mLongPressTimer, SIGNAL(timeout()), this, SLOT(longPressEvent()));

   if (UBStylusTool::Selector == currentTool)
   {
        drawingController->setStylusTool(UBStylusTool::Play);
   }
   else
   if (currentTool == UBStylusTool::Play)
   {
        drawingController->setStylusTool(UBStylusTool::Selector);
   }
   else
   if (UBStylusTool::Eraser == currentTool)
   {
       UBApplication::boardController->paletteManager()->toggleErasePalette(true);
   }

}

void UBBoardView::mousePressEvent (QMouseEvent *event)
{
    if (!isControl) {
        event->ignore();
        return;
    }

    mIsDragInProgress = false;

    if (isAbsurdPoint (event->pos ()))
    {
        event->accept ();
        return;
    }

    mMouseDownPos = event->pos ();

    movingItem = scene()->itemAt(this->mapToScene(event->posF().toPoint()));
    if (!movingItem)
        emit clickOnBoard();

    if (event->button () == Qt::LeftButton && isInteractive ())
    {

        UBStylusTool::Enum currentTool = (UBStylusTool::Enum)UBDrawingController::drawingController ()->stylusTool ();

        if (!mTabletStylusIsPressed)
            mMouseButtonIsPressed = true;

        if (currentTool == UBStylusTool::ZoomIn)
        {
            mController->zoomIn (mapToScene (event->pos ()));
            event->accept ();
        }
        else if (currentTool == UBStylusTool::ZoomOut)
        {
            mController->zoomOut (mapToScene (event->pos ()));
            event->accept ();
        }
        else if (currentTool == UBStylusTool::Hand)
        {
            viewport ()->setCursor (QCursor (Qt::ClosedHandCursor));
            mPreviousPoint = event->posF ();
            event->accept ();
        }
        else if (currentTool == UBStylusTool::Selector || currentTool == UBStylusTool::Play)
        {
            connect(&mLongPressTimer, SIGNAL(timeout()), this, SLOT(longPressEvent()));
            if (!movingItem && !mController->cacheIsVisible())
                mLongPressTimer.start();
            
            if (!movingItem) {
                // Rubberband selection implementation
                if (!mUBRubberBand) {
                    mUBRubberBand = new UBRubberBand(QRubberBand::Rectangle, this);
                }
                mUBRubberBand->setGeometry (QRect (mMouseDownPos, QSize ()));
                mUBRubberBand->show();
            }
            else
            {
                if(mUBRubberBand)
                    mUBRubberBand->hide();
            }

            handleItemMousePress(event);
            event->accept();
        }
        else if (currentTool == UBStylusTool::Text)
        {
            int frameWidth = UBSettings::settings ()->objectFrameWidth;
            QRectF fuzzyRect (0, 0, frameWidth * 4, frameWidth * 4);
            fuzzyRect.moveCenter (mapToScene (mMouseDownPos));

            UBGraphicsTextItem* foundTextItem = 0;
            QListIterator<QGraphicsItem *> it (scene ()->items (fuzzyRect));

            while (it.hasNext () && !foundTextItem)
            {
                foundTextItem = qgraphicsitem_cast<UBGraphicsTextItem*>(it.next ());
            }

            if (foundTextItem)
            {
                mIsCreatingTextZone = false;
                QGraphicsView::mousePressEvent (event);
            }
            else
            {
                scene ()->deselectAllItems ();

                if (!mRubberBand)
                    mRubberBand = new UBRubberBand (QRubberBand::Rectangle, this);
                mRubberBand->setGeometry (QRect (mMouseDownPos, QSize ()));
                mRubberBand->show ();
                mIsCreatingTextZone = true;

                event->accept ();
            }
        }
        else if (currentTool == UBStylusTool::Capture)
        {
            scene ()->deselectAllItems ();

            if (!mRubberBand)
                mRubberBand = new UBRubberBand (QRubberBand::Rectangle, this);

            mRubberBand->setGeometry (QRect (mMouseDownPos, QSize ()));
            mRubberBand->show ();
            mIsCreatingSceneGrabZone = true;

            event->accept ();
        }
        else
        {
            if(UBDrawingController::drawingController()->mActiveRuler==NULL)
            {
                viewport()->setCursor (QCursor (Qt::BlankCursor));
            }

            if (scene () && !mTabletStylusIsPressed)
            {
                if (currentTool == UBStylusTool::Eraser)
                {
                    connect(&mLongPressTimer, SIGNAL(timeout()), this, SLOT(longPressEvent()));
                    mLongPressTimer.start();
                }
                scene ()->inputDevicePress (mapToScene (UBGeometryUtils::pointConstrainedInRect (event->pos (), rect ())));
            }
            event->accept ();
        }
    }
}

void
UBBoardView::mouseMoveEvent (QMouseEvent *event)
{
  if(!mIsDragInProgress && ((mapToScene(event->pos()) - mLastPressedMousePos).manhattanLength() < QApplication::startDragDistance())) 
  {
      return;
  }

  mIsDragInProgress = true;
  UBStylusTool::Enum currentTool = (UBStylusTool::Enum)UBDrawingController::drawingController ()->stylusTool ();

  mLongPressTimer.stop();

  if (isAbsurdPoint (event->pos ()))
    {
      event->accept ();
      return;
    }

  if (currentTool == UBStylusTool::Hand && (mMouseButtonIsPressed || mTabletStylusIsPressed))
    {
      QPointF eventPosition = event->posF ();
      qreal dx = eventPosition.x () - mPreviousPoint.x ();
      qreal dy = eventPosition.y () - mPreviousPoint.y ();
      mController->handScroll (dx, dy);
      mPreviousPoint = eventPosition;
      event->accept ();
    }
  else if (currentTool == UBStylusTool::Selector || currentTool == UBStylusTool::Play)
  {
      if((event->pos() - mLastPressedMousePos).manhattanLength() < QApplication::startDragDistance()) {
          return;
      }

      if (!movingItem && (mMouseButtonIsPressed || mTabletStylusIsPressed) && mUBRubberBand && mUBRubberBand->isVisible()) {

          QRect bandRect(mMouseDownPos, event->pos());

          bandRect = bandRect.normalized();

          mUBRubberBand->setGeometry(bandRect);

          QList<QGraphicsItem *> rubberItems = items(bandRect);
          foreach (QGraphicsItem *item, mJustSelectedItems) {
              if (!rubberItems.contains(item)) {
                  item->setSelected(false);
                  mJustSelectedItems.remove(item);
              }
          }

          if (currentTool == UBStylusTool::Selector)
          foreach (QGraphicsItem *item, items(bandRect)) {

              if (item->type() == UBGraphicsW3CWidgetItem::Type
                      || item->type() == UBGraphicsPixmapItem::Type
                      || item->type() == UBGraphicsMediaItem::Type
                      || item->type() == UBGraphicsSvgItem::Type
                      || item->type() == UBGraphicsTextItem::Type
                      || item->type() == UBGraphicsStrokesGroup::Type
                      || item->type() == UBGraphicsGroupContainerItem::Type) {

                  if (!mJustSelectedItems.contains(item)) {
                      item->setSelected(true);
                      mJustSelectedItems.insert(item);
                  }
              }
          }
      }

      handleItemMouseMove(event);
    }
  else if ((UBDrawingController::drawingController()->isDrawingTool())
    && !mMouseButtonIsPressed)
  {
      QGraphicsView::mouseMoveEvent (event);
  }
  else if (currentTool == UBStylusTool::Text || currentTool == UBStylusTool::Capture)
    {
      if (mRubberBand && (mIsCreatingTextZone || mIsCreatingSceneGrabZone))
        {
          mRubberBand->setGeometry (QRect (mMouseDownPos, event->pos ()).normalized ());
          event->accept ();
        }
      else
        {
          QGraphicsView::mouseMoveEvent (event);
        }
    }
  else
    {
      if (!mTabletStylusIsPressed && scene ())
      {           
          scene ()->inputDeviceMove (mapToScene (UBGeometryUtils::pointConstrainedInRect (event->pos (), rect ())), mMouseButtonIsPressed);
      }
      event->accept ();
    }

    if((event->pos() - mLastPressedMousePos).manhattanLength() < QApplication::startDragDistance()) 
        mWidgetMoved = true;
}

void
UBBoardView::mouseReleaseEvent (QMouseEvent *event)
{
    UBStylusTool::Enum currentTool = (UBStylusTool::Enum)UBDrawingController::drawingController ()->stylusTool ();

  setToolCursor (currentTool);
  // first/ propagate device release to the scene
  if (scene ())
    scene ()->inputDeviceRelease ();

  if (currentTool == UBStylusTool::Selector)
  {
      bool bReleaseIsNeed = true;
      if (mWidgetMoved)
      {
          mWidgetMoved = false;
          movingItem = NULL;
      }
      else 
      if (movingItem)
      {         
          if (suspendedMousePressEvent)
          {
              QGraphicsView::mousePressEvent(suspendedMousePressEvent);     // suspendedMousePressEvent is deleted by old Qt event loop
              movingItem = NULL;
              delete suspendedMousePressEvent;
              suspendedMousePressEvent = NULL;
              bReleaseIsNeed = true;
          }
          else
          {
             if (QGraphicsSvgItem::Type !=  movingItem->type() &&
                UBGraphicsDelegateFrame::Type !=  movingItem->type() &&
                UBToolWidget::Type != movingItem->type() &&
                QGraphicsWebView::Type != movingItem->type() && // for W3C widgets as Tools.
                !(movingItem->parentItem() && UBGraphicsW3CWidgetItem::Type == movingItem->type() && UBGraphicsGroupContainerItem::Type == movingItem->parentItem()->type()))
             {
                 bReleaseIsNeed = false;
                 if (movingItem->isSelected() && isMultipleSelectionEnabled())
                    movingItem->setSelected(false);
                 else
                 {
                    if (movingItem->isSelected())
                        bReleaseIsNeed = true;

                    movingItem->setSelected(true);
                 }
                
             }
          }
      }

      if (mUBRubberBand && mUBRubberBand->isVisible()) {
          mUBRubberBand->hide();
      }

      if (bReleaseIsNeed)
      {
          QGraphicsView::mouseReleaseEvent (event);
      }
  }
  else if (currentTool == UBStylusTool::Play)
  {
      if (mWidgetMoved)
      {
          movingItem = NULL;
          mWidgetMoved = false;
      }
      else
      {
          if (suspendedMousePressEvent)     
          {
              QGraphicsView::mousePressEvent(suspendedMousePressEvent);     // suspendedMousePressEvent is deleted by old Qt event loop
              movingItem = NULL;
              delete suspendedMousePressEvent;
              suspendedMousePressEvent = NULL;
          }
      }
      QGraphicsView::mouseReleaseEvent (event);
  }
  else if (currentTool == UBStylusTool::Text)
    {
      if (mRubberBand)
        mRubberBand->hide ();

      if (scene () && mRubberBand && mIsCreatingTextZone)
        {
          QRect rubberRect = mRubberBand->geometry ();

          UBGraphicsTextItem* textItem = scene()->addTextHtml ("", mapToScene (rubberRect.topLeft ()));
          event->accept ();

          UBDrawingController::drawingController ()->setStylusTool (UBStylusTool::Selector);

          textItem->setSelected (true);
          textItem->setFocus();
        }
      else
        {
          QGraphicsView::mouseReleaseEvent (event);
        }

      mIsCreatingTextZone = false;
    }
  else if (currentTool == UBStylusTool::Capture)
    {
      if (mRubberBand)
        mRubberBand->hide ();

      if (scene () && mRubberBand && mIsCreatingSceneGrabZone && mRubberBand->geometry ().width () > 16)
        {
          QRect rect = mRubberBand->geometry ();
          QPointF sceneTopLeft = mapToScene (rect.topLeft ());
          QPointF sceneBottomRight = mapToScene (rect.bottomRight ());
          QRectF sceneRect (sceneTopLeft, sceneBottomRight);

          mController->grabScene (sceneRect);

          event->accept ();
        }
      else
        {
          QGraphicsView::mouseReleaseEvent (event);
        }

      mIsCreatingSceneGrabZone = false;
    }
  else
    {
      if (mPendingStylusReleaseEvent || mMouseButtonIsPressed)
        {
          event->accept ();
        }
    }

  mMouseButtonIsPressed = false;
  mPendingStylusReleaseEvent = false;
  mTabletStylusIsPressed = false;
  movingItem = NULL;

  mLongPressTimer.stop();
}

void
UBBoardView::forcedTabletRelease ()
{

  if (mMouseButtonIsPressed || mTabletStylusIsPressed || mPendingStylusReleaseEvent)
    {
      qWarning () << "dirty mouse/tablet state:";
      qWarning () << "mMouseButtonIsPressed =" << mMouseButtonIsPressed;
      qWarning () << "mTabletStylusIsPressed = " << mTabletStylusIsPressed;
      qWarning () << "mPendingStylusReleaseEvent" << mPendingStylusReleaseEvent;
      qWarning () << "forcing device release";

      scene ()->inputDeviceRelease ();

      mMouseButtonIsPressed = false;
      mTabletStylusIsPressed = false;
      mPendingStylusReleaseEvent = false;
    }
}

void
UBBoardView::mouseDoubleClickEvent (QMouseEvent *event)
{
  // We don't want a double click, we want two clicks
  mousePressEvent (event);
}

void
UBBoardView::wheelEvent (QWheelEvent *wheelEvent)
{
  if (isInteractive () && wheelEvent->orientation () == Qt::Vertical)
    {
      // Too many wheelEvent are sent, how should we handle them to "smoothly" zoom ?
      // something like zoom( pow(zoomFactor, event->delta() / 120) )

      // use DateTime man, store last event time, and if if less than 300ms than this is one big scroll
      // and move scroll with one const speed.
        // so, you no will related with scroll event count
    }

    QList<QGraphicsItem *> selItemsList = scene()->selectedItems();
    // if NO have selected items, than no need process mouse wheel. just exist
    if( selItemsList.count() > 0 )
    {
        // only one selected item possible, so we will work with first item only
        QGraphicsItem * selItem = selItemsList[0];

        // get items list under mouse cursor
        QPointF scenePos = mapToScene(wheelEvent->pos());
        QList<QGraphicsItem *> itemsList = scene()->items(scenePos);

        QBool isSlectedAndMouseHower = itemsList.contains(selItem);
        if(isSlectedAndMouseHower)
        {
            QGraphicsView::wheelEvent(wheelEvent);
            wheelEvent->accept();
        }

    }

}

void
UBBoardView::leaveEvent (QEvent * event)
{
  if (scene ())
    scene ()->leaveEvent (event);

  QGraphicsView::leaveEvent (event);
}

void
UBBoardView::drawItems (QPainter *painter, int numItems,
                        QGraphicsItem* items[],
                        const QStyleOptionGraphicsItem options[])
{
  if (!mFilterZIndex)
    {
      QGraphicsView::drawItems (painter, numItems, items, options);
    }
  else
    {
      int count = 0;

      QGraphicsItem** itemsFiltered = new QGraphicsItem*[numItems];
      QStyleOptionGraphicsItem *optionsFiltered = new QStyleOptionGraphicsItem[numItems];

      for (int i = 0; i < numItems; i++)
        {
          if (shouldDisplayItem (items[i]))
            {
              itemsFiltered[count] = items[i];
              optionsFiltered[count] = options[i];
              count++;
            }
        }

      QGraphicsView::drawItems (painter, count, itemsFiltered, optionsFiltered);

      delete[] optionsFiltered;
      delete[] itemsFiltered;
    }
}


void UBBoardView::dragMoveEvent(QDragMoveEvent *event)
{
  QGraphicsView::dragMoveEvent(event);
  event->acceptProposedAction();
}

void UBBoardView::dropEvent (QDropEvent *event)
{
  if (!itemAt(event->pos().x(),event->pos().y())) {
    if (!event->source() || dynamic_cast<UBThumbnailWidget *>(event->source()) || dynamic_cast<QWebView*>(event->source()) || dynamic_cast<UBTGMediaWidget*>(event->source()) || dynamic_cast<QListView *>(event->source()) || dynamic_cast<UBTGDraggableTreeItem*>(event->source())) {
        mController->processMimeData (event->mimeData (), mapToScene (event->pos ()));
        event->acceptProposedAction();
    }
  }
  else
    QGraphicsView::dropEvent(event);
}

void
UBBoardView::resizeEvent (QResizeEvent * event)
{
  const qreal maxWidth = width () * 10;
  const qreal maxHeight = height () * 10;

  setSceneRect (-(maxWidth / 2), -(maxHeight / 2), maxWidth, maxHeight);
  centerOn (0, 0);

  emit resized (event);
}

void
UBBoardView::drawBackground (QPainter *painter, const QRectF &rect)
{
  if (testAttribute (Qt::WA_TranslucentBackground))
    {
      QGraphicsView::drawBackground (painter, rect);
      return;
    }

  bool darkBackground = scene () && scene ()->isDarkBackground ();

  if (darkBackground)
    {
      painter->fillRect (rect, QBrush (QColor (Qt::black)));
    }
  else
    {
      painter->fillRect (rect, QBrush (QColor (Qt::white)));
    }

  if (transform ().m11 () > 0.5)
    {
      QColor bgCrossColor;

      if (darkBackground)
        bgCrossColor = UBSettings::crossDarkBackground;
      else
        bgCrossColor = UBSettings::crossLightBackground;

      if (transform ().m11 () < 1.0)
        {
          int alpha = 255 * transform ().m11 () / 2;
          bgCrossColor.setAlpha (alpha); // fade the crossing on small zooms
        }

      painter->setPen (bgCrossColor);

      if (scene () && scene ()->isCrossedBackground ())
        {
          qreal firstY = ((int) (rect.y () / UBSettings::crossSize)) * UBSettings::crossSize;

          for (qreal yPos = firstY; yPos < rect.y () + rect.height (); yPos += UBSettings::crossSize)
            {
              painter->drawLine (rect.x (), yPos, rect.x () + rect.width (), yPos);
            }

          qreal firstX = ((int) (rect.x () / UBSettings::crossSize)) * UBSettings::crossSize;

          for (qreal xPos = firstX; xPos < rect.x () + rect.width (); xPos += UBSettings::crossSize)
            {
              painter->drawLine (xPos, rect.y (), xPos, rect.y () + rect.height ());
            }
        }
    }

  if (!mFilterZIndex && scene ())
    {
      QSize pageNominalSize = scene ()->nominalSize ();

      if (pageNominalSize.isValid ())
        {
          qreal penWidth = 8.0 / transform ().m11 ();

          QRectF pageRect (pageNominalSize.width () / -2, pageNominalSize.height () / -2
                           , pageNominalSize.width (), pageNominalSize.height ());

          pageRect.adjust (-penWidth / 2, -penWidth / 2, penWidth / 2, penWidth / 2);

          QColor docSizeColor;

          if (darkBackground)
            docSizeColor = UBSettings::documentSizeMarkColorDarkBackground;
          else
            docSizeColor = UBSettings::documentSizeMarkColorLightBackground;

          QPen pen (docSizeColor);
          pen.setWidth (penWidth);
          painter->setPen (pen);
          painter->drawRect (pageRect);
        }
    }
}

void
UBBoardView::settingChanged (QVariant newValue)
{
  Q_UNUSED (newValue);

  mPenPressureSensitive = UBSettings::settings ()->boardPenPressureSensitive->get ().toBool ();
  mMarkerPressureSensitive = UBSettings::settings ()->boardMarkerPressureSensitive->get ().toBool ();
  mUseHighResTabletEvent = UBSettings::settings ()->boardUseHighResTabletEvent->get ().toBool ();
}

void UBBoardView::virtualKeyboardActivated(bool b)
{
    UBPlatformUtils::setWindowNonActivableFlag(this, b);
    mVirtualKeyboardActive = b;
    setInteractive(!b);
}


// Apple remote desktop sends funny events when the transmission is bad

bool UBBoardView::isAbsurdPoint(QPoint point)
{
    QDesktopWidget *desktop = qApp->desktop ();
    bool isValidPoint = false;

    for (int i = 0; i < desktop->numScreens (); i++)
    {
      QRect screenRect = desktop->screenGeometry (i);
      isValidPoint = isValidPoint || screenRect.contains (point);
    }

    return !isValidPoint;
}

void
UBBoardView::focusOutEvent (QFocusEvent * event)
{
  Q_UNUSED (event);
}

void
UBBoardView::setToolCursor (int tool)
{
  QWidget *controlViewport = viewport ();
  switch (tool)
    {
    case UBStylusTool::Pen:
      controlViewport->setCursor (UBResources::resources ()->penCursor);
      break;
    case UBStylusTool::Eraser:
      controlViewport->setCursor (UBResources::resources ()->eraserCursor);
      scene()->hideEraser();
      break;
    case UBStylusTool::Marker:
      controlViewport->setCursor (UBResources::resources ()->markerCursor);
      break;
    case UBStylusTool::Pointer:
      controlViewport->setCursor (UBResources::resources ()->pointerCursor);
      break;
    case UBStylusTool::Hand:
      controlViewport->setCursor (UBResources::resources ()->handCursor);
      break;
    case UBStylusTool::ZoomIn:
      controlViewport->setCursor (UBResources::resources ()->zoomInCursor);
      break;
    case UBStylusTool::ZoomOut:
      controlViewport->setCursor (UBResources::resources ()->zoomOutCursor);
      break;
    case UBStylusTool::Selector:
      controlViewport->setCursor (UBResources::resources ()->arrowCursor);
      break;
    case UBStylusTool::Play:
      controlViewport->setCursor (UBResources::resources ()->playCursor);
      break;
    case UBStylusTool::Line:
      controlViewport->setCursor (UBResources::resources ()->penCursor);
      break;
    case UBStylusTool::Text:
      controlViewport->setCursor (UBResources::resources ()->textCursor);
      break;
    case UBStylusTool::Capture:
      controlViewport->setCursor (UBResources::resources ()->penCursor);
      break;
    default:
      Q_ASSERT (false);
      //failsafe
      controlViewport->setCursor (UBResources::resources ()->penCursor);
    }
}


bool UBBoardView::hasSelectedParents(QGraphicsItem * item)
{
    if (item->isSelected())
        return true;
    if (item->parentItem()==NULL)
        return false;
    return hasSelectedParents(item->parentItem());
}