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fix use after free of movingItem

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Victor "multun" Collod 4 years ago
parent 6edebf9632
commit fb25c17e4e
2 changed files with 105 additions and 74 deletions
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  1. 149
      src/board/UBBoardView.cpp
  2. 30
      src/board/UBBoardView.h

149
src/board/UBBoardView.cpp
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@ -95,6 +95,7 @@ UBBoardView::UBBoardView (UBBoardController* pController, QWidget* pParent, bool
, mLongPressInterval(1000) , mLongPressInterval(1000)
, mIsDragInProgress(false) , mIsDragInProgress(false)
, mMultipleSelectionIsEnabled(false) , mMultipleSelectionIsEnabled(false)
, _movingItem(nullptr)
, bIsControl(isControl) , bIsControl(isControl)
, bIsDesktop(isDesktop) , bIsDesktop(isDesktop)
{ {
@ -119,6 +120,7 @@ UBBoardView::UBBoardView (UBBoardController* pController, int pStartLayer, int p
, mLongPressInterval(1000) , mLongPressInterval(1000)
, mIsDragInProgress(false) , mIsDragInProgress(false)
, mMultipleSelectionIsEnabled(false) , mMultipleSelectionIsEnabled(false)
, _movingItem(nullptr)
, bIsControl(isControl) , bIsControl(isControl)
, bIsDesktop(isDesktop) , bIsDesktop(isDesktop)
{ {
@ -178,7 +180,7 @@ void UBBoardView::init ()
unsetCursor(); unsetCursor();
movingItem = NULL; setMovingItem(NULL);
mWidgetMoved = false; mWidgetMoved = false;
} }
@ -482,7 +484,7 @@ void UBBoardView::handleItemsSelection(QGraphicsItem *item)
if (item) if (item)
{ {
// item has group as first parent - it is any item or UBGraphicsStrokesGroup. // item has group as first parent - it is any item or UBGraphicsStrokesGroup.
if(item->parentItem() && UBGraphicsGroupContainerItem::Type == movingItem->parentItem()->type()) if(item->parentItem() && UBGraphicsGroupContainerItem::Type == getMovingItem()->parentItem()->type())
return; return;
// delegate buttons shouldn't selected // delegate buttons shouldn't selected
@ -578,7 +580,7 @@ Here we determines cases when items should to get mouse press event at pressing
case UBGraphicsGroupContainerItem::Type: case UBGraphicsGroupContainerItem::Type:
if(currentTool == UBStylusTool::Play) if(currentTool == UBStylusTool::Play)
{ {
movingItem = NULL; setMovingItem(NULL);
return true; return true;
} }
return false; return false;
@ -648,10 +650,10 @@ bool UBBoardView::itemShouldBeMoved(QGraphicsItem *item)
if (!(mMouseButtonIsPressed || mTabletStylusIsPressed)) if (!(mMouseButtonIsPressed || mTabletStylusIsPressed))
return false; return false;
if (movingItem->data(UBGraphicsItemData::ItemLocked).toBool()) if (getMovingItem()->data(UBGraphicsItemData::ItemLocked).toBool())
return false; return false;
if (movingItem->parentItem() && UBGraphicsGroupContainerItem::Type == movingItem->parentItem()->type() && !movingItem->isSelected() && movingItem->parentItem()->isSelected()) if (getMovingItem()->parentItem() && UBGraphicsGroupContainerItem::Type == getMovingItem()->parentItem()->type() && !getMovingItem()->isSelected() && getMovingItem()->parentItem()->isSelected())
return false; return false;
UBStylusTool::Enum currentTool = (UBStylusTool::Enum)UBDrawingController::drawingController()->stylusTool(); UBStylusTool::Enum currentTool = (UBStylusTool::Enum)UBDrawingController::drawingController()->stylusTool();
@ -759,13 +761,13 @@ void UBBoardView::handleItemMousePress(QMouseEvent *event)
// Determining item who will take mouse press event // Determining item who will take mouse press event
//all other items will be deselected and if all item will be deselected, then //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 // wrong item can catch mouse press. because selected items placed on the top
movingItem = determineItemToPress(movingItem); setMovingItem(determineItemToPress(getMovingItem()));
handleItemsSelection(movingItem); handleItemsSelection(getMovingItem());
if (isMultipleSelectionEnabled()) if (isMultipleSelectionEnabled())
return; return;
if (itemShouldReceiveMousePressEvent(movingItem)){ if (itemShouldReceiveMousePressEvent(getMovingItem())){
QGraphicsView::mousePressEvent (event); QGraphicsView::mousePressEvent (event);
QGraphicsItem* item = determineItemToPress(scene()->itemAt(this->mapToScene(event->localPos().toPoint()), transform())); QGraphicsItem* item = determineItemToPress(scene()->itemAt(this->mapToScene(event->localPos().toPoint()), transform()));
@ -780,17 +782,17 @@ void UBBoardView::handleItemMousePress(QMouseEvent *event)
if ((*it)->pos().x() < 0 || (*it)->pos().y() < 0) if ((*it)->pos().x() < 0 || (*it)->pos().y() < 0)
(*it)->setPos(0,item->boundingRect().size().height()); (*it)->setPos(0,item->boundingRect().size().height());
} }
movingItem = item; setMovingItem(item);
} }
else else
{ {
if (movingItem) if (getMovingItem())
{ {
UBGraphicsItem *graphicsItem = dynamic_cast<UBGraphicsItem*>(movingItem); UBGraphicsItem *graphicsItem = dynamic_cast<UBGraphicsItem*>(getMovingItem());
if (graphicsItem) if (graphicsItem)
graphicsItem->Delegate()->startUndoStep(); graphicsItem->Delegate()->startUndoStep();
movingItem->clearFocus(); getMovingItem()->clearFocus();
} }
if (suspendedMousePressEvent) if (suspendedMousePressEvent)
@ -799,7 +801,7 @@ void UBBoardView::handleItemMousePress(QMouseEvent *event)
suspendedMousePressEvent = NULL; suspendedMousePressEvent = NULL;
} }
if (itemShouldReceiveSuspendedMousePressEvent(movingItem)) if (itemShouldReceiveSuspendedMousePressEvent(getMovingItem()))
{ {
suspendedMousePressEvent = new QMouseEvent(event->type(), event->pos(), event->button(), event->buttons(), event->modifiers()); suspendedMousePressEvent = new QMouseEvent(event->type(), event->pos(), event->button(), event->buttons(), event->modifiers());
} }
@ -809,14 +811,14 @@ void UBBoardView::handleItemMousePress(QMouseEvent *event)
void UBBoardView::handleItemMouseMove(QMouseEvent *event) void UBBoardView::handleItemMouseMove(QMouseEvent *event)
{ {
// determine item to move (maybee we need to move group of item or his parent. // determine item to move (maybee we need to move group of item or his parent.
movingItem = determineItemToMove(movingItem); setMovingItem(determineItemToMove(getMovingItem()));
// items should be moved not every mouse move. // items should be moved not every mouse move.
if (movingItem && itemShouldBeMoved(movingItem) && (mMouseButtonIsPressed || mTabletStylusIsPressed)) if (getMovingItem() && itemShouldBeMoved(getMovingItem()) && (mMouseButtonIsPressed || mTabletStylusIsPressed))
{ {
QPointF scenePos = mapToScene(event->pos()); QPointF scenePos = mapToScene(event->pos());
QPointF newPos = movingItem->pos() + scenePos - mLastPressedMousePos; QPointF newPos = getMovingItem()->pos() + scenePos - mLastPressedMousePos;
movingItem->setPos(newPos); getMovingItem()->setPos(newPos);
mLastPressedMousePos = scenePos; mLastPressedMousePos = scenePos;
mWidgetMoved = true; mWidgetMoved = true;
event->accept(); event->accept();
@ -826,21 +828,21 @@ void UBBoardView::handleItemMouseMove(QMouseEvent *event)
QPointF posBeforeMove; QPointF posBeforeMove;
QPointF posAfterMove; QPointF posAfterMove;
if (movingItem) if (getMovingItem())
posBeforeMove = movingItem->pos(); posBeforeMove = getMovingItem()->pos();
QGraphicsView::mouseMoveEvent (event); QGraphicsView::mouseMoveEvent (event);
if (movingItem) if (getMovingItem())
posAfterMove = movingItem->pos(); posAfterMove = getMovingItem()->pos();
mWidgetMoved = ((posAfterMove-posBeforeMove).manhattanLength() != 0); mWidgetMoved = ((posAfterMove-posBeforeMove).manhattanLength() != 0);
// a cludge for terminate moving of w3c widgets. // 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, // 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. // 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 (movingItem && mWidgetMoved && UBGraphicsW3CWidgetItem::Type == movingItem->type()) if (getMovingItem() && mWidgetMoved && UBGraphicsW3CWidgetItem::Type == getMovingItem()->type())
movingItem->setPos(posBeforeMove); getMovingItem()->setPos(posBeforeMove);
} }
} }
@ -992,7 +994,7 @@ void UBBoardView::mousePressEvent (QMouseEvent *event)
} }
mMouseDownPos = event->pos (); mMouseDownPos = event->pos ();
movingItem = scene()->itemAt(this->mapToScene(event->localPos().toPoint()), QTransform()); setMovingItem(scene()->itemAt(this->mapToScene(event->localPos().toPoint()), QTransform()));
if (event->button () == Qt::LeftButton && isInteractive()) if (event->button () == Qt::LeftButton && isInteractive())
{ {
@ -1024,11 +1026,11 @@ void UBBoardView::mousePressEvent (QMouseEvent *event)
return; return;
} }
if (scene()->backgroundObject() == movingItem) if (scene()->backgroundObject() == getMovingItem())
movingItem = NULL; setMovingItem(NULL);
connect(&mLongPressTimer, SIGNAL(timeout()), this, SLOT(longPressEvent())); connect(&mLongPressTimer, SIGNAL(timeout()), this, SLOT(longPressEvent()));
if (!movingItem && !mController->cacheIsVisible()) if (!getMovingItem() && !mController->cacheIsVisible())
mLongPressTimer.start(); mLongPressTimer.start();
handleItemMousePress(event); handleItemMousePress(event);
@ -1143,7 +1145,7 @@ void UBBoardView::mouseMoveEvent (QMouseEvent *event)
bool rubberMove = (currentTool != (UBStylusTool::Play)) bool rubberMove = (currentTool != (UBStylusTool::Play))
&& (mMouseButtonIsPressed || mTabletStylusIsPressed) && (mMouseButtonIsPressed || mTabletStylusIsPressed)
&& !movingItem; && !getMovingItem();
if (rubberMove) { if (rubberMove) {
QRect bandRect(mMouseDownPos, event->pos()); QRect bandRect(mMouseDownPos, event->pos());
@ -1229,6 +1231,11 @@ void UBBoardView::mouseMoveEvent (QMouseEvent *event)
} }
void UBBoardView::movingItemDestroyed(QObject*)
{
setMovingItem(nullptr);
}
void UBBoardView::mouseReleaseEvent (QMouseEvent *event) void UBBoardView::mouseReleaseEvent (QMouseEvent *event)
{ {
UBStylusTool::Enum currentTool = (UBStylusTool::Enum)UBDrawingController::drawingController ()->stylusTool (); UBStylusTool::Enum currentTool = (UBStylusTool::Enum)UBDrawingController::drawingController ()->stylusTool ();
@ -1245,60 +1252,60 @@ void UBBoardView::mouseReleaseEvent (QMouseEvent *event)
return; return;
} }
UBGraphicsItem *graphicsItem = dynamic_cast<UBGraphicsItem*>(movingItem); UBGraphicsItem *graphicsItem = dynamic_cast<UBGraphicsItem*>(getMovingItem());
if (graphicsItem) if (graphicsItem)
graphicsItem->Delegate()->commitUndoStep(); graphicsItem->Delegate()->commitUndoStep();
bool bReleaseIsNeed = true; bool bReleaseIsNeed = true;
if (movingItem != determineItemToPress(scene()->itemAt(this->mapToScene(event->localPos().toPoint()), QTransform()))) if (getMovingItem() != determineItemToPress(scene()->itemAt(this->mapToScene(event->localPos().toPoint()), QTransform())))
{ {
movingItem = NULL; setMovingItem(nullptr);
bReleaseIsNeed = false; bReleaseIsNeed = false;
} }
if (mWidgetMoved) if (mWidgetMoved)
{ {
mWidgetMoved = false; mWidgetMoved = false;
movingItem = NULL; setMovingItem(nullptr);
} }
else else
if (movingItem && (!isCppTool(movingItem) || UBGraphicsCurtainItem::Type == movingItem->type())) if (getMovingItem() && (!isCppTool(getMovingItem()) || UBGraphicsCurtainItem::Type == getMovingItem()->type()))
{ {
if (suspendedMousePressEvent) if (suspendedMousePressEvent)
{ {
QGraphicsView::mousePressEvent(suspendedMousePressEvent); // suspendedMousePressEvent is deleted by old Qt event loop QGraphicsView::mousePressEvent(suspendedMousePressEvent); // suspendedMousePressEvent is deleted by old Qt event loop
movingItem = NULL; setMovingItem(NULL);
delete suspendedMousePressEvent; delete suspendedMousePressEvent;
suspendedMousePressEvent = NULL; suspendedMousePressEvent = NULL;
bReleaseIsNeed = true; bReleaseIsNeed = true;
} }
else else
{ {
if (isUBItem(movingItem) && if (isUBItem(getMovingItem()) &&
DelegateButton::Type != movingItem->type() && DelegateButton::Type != getMovingItem()->type() &&
UBGraphicsDelegateFrame::Type != movingItem->type() && UBGraphicsDelegateFrame::Type != getMovingItem()->type() &&
UBGraphicsCache::Type != movingItem->type() && UBGraphicsCache::Type != getMovingItem()->type() &&
QGraphicsWebView::Type != movingItem->type() && // for W3C widgets as Tools. QGraphicsWebView::Type != getMovingItem()->type() && // for W3C widgets as Tools.
!(!isMultipleSelectionEnabled() && movingItem->parentItem() && UBGraphicsWidgetItem::Type == movingItem->type() && UBGraphicsGroupContainerItem::Type == movingItem->parentItem()->type())) !(!isMultipleSelectionEnabled() && getMovingItem()->parentItem() && UBGraphicsWidgetItem::Type == getMovingItem()->type() && UBGraphicsGroupContainerItem::Type == getMovingItem()->parentItem()->type()))
{ {
bReleaseIsNeed = false; bReleaseIsNeed = false;
if (movingItem->isSelected() && isMultipleSelectionEnabled()) if (getMovingItem()->isSelected() && isMultipleSelectionEnabled())
movingItem->setSelected(false); getMovingItem()->setSelected(false);
else else
if (movingItem->parentItem() && movingItem->parentItem()->isSelected() && isMultipleSelectionEnabled()) if (getMovingItem()->parentItem() && getMovingItem()->parentItem()->isSelected() && isMultipleSelectionEnabled())
movingItem->parentItem()->setSelected(false); getMovingItem()->parentItem()->setSelected(false);
else else
{ {
if (movingItem->isSelected()) if (getMovingItem()->isSelected())
bReleaseIsNeed = true; bReleaseIsNeed = true;
UBGraphicsTextItem* textItem = dynamic_cast<UBGraphicsTextItem*>(movingItem); UBGraphicsTextItem* textItem = dynamic_cast<UBGraphicsTextItem*>(getMovingItem());
UBGraphicsMediaItem* movieItem = dynamic_cast<UBGraphicsMediaItem*>(movingItem); UBGraphicsMediaItem* movieItem = dynamic_cast<UBGraphicsMediaItem*>(getMovingItem());
if(textItem) if(textItem)
textItem->setSelected(true); textItem->setSelected(true);
else if(movieItem) else if(movieItem)
movieItem->setSelected(true); movieItem->setSelected(true);
else else
movingItem->setSelected(true); getMovingItem()->setSelected(true);
} }
} }
@ -1315,20 +1322,20 @@ void UBBoardView::mouseReleaseEvent (QMouseEvent *event)
else if (currentTool == UBStylusTool::Text) else if (currentTool == UBStylusTool::Text)
{ {
bool bReleaseIsNeed = true; bool bReleaseIsNeed = true;
if (movingItem != determineItemToPress(scene()->itemAt(this->mapToScene(event->localPos().toPoint()), QTransform()))) if (getMovingItem() != determineItemToPress(scene()->itemAt(this->mapToScene(event->localPos().toPoint()), QTransform())))
{ {
movingItem = NULL; setMovingItem(NULL);
bReleaseIsNeed = false; bReleaseIsNeed = false;
} }
UBGraphicsItem *graphicsItem = dynamic_cast<UBGraphicsItem*>(movingItem); UBGraphicsItem *graphicsItem = dynamic_cast<UBGraphicsItem*>(getMovingItem());
if (graphicsItem) if (graphicsItem)
graphicsItem->Delegate()->commitUndoStep(); graphicsItem->Delegate()->commitUndoStep();
if (mWidgetMoved) if (mWidgetMoved)
{ {
mWidgetMoved = false; mWidgetMoved = false;
movingItem = NULL; setMovingItem(NULL);
if (scene () && mRubberBand && mIsCreatingTextZone) { if (scene () && mRubberBand && mIsCreatingTextZone) {
QRect rubberRect = mRubberBand->geometry (); QRect rubberRect = mRubberBand->geometry ();
@ -1343,37 +1350,37 @@ void UBBoardView::mouseReleaseEvent (QMouseEvent *event)
textItem->setFocus(); textItem->setFocus();
} }
} }
else if (movingItem && (!isCppTool(movingItem) || UBGraphicsCurtainItem::Type == movingItem->type())) else if (getMovingItem() && (!isCppTool(getMovingItem()) || UBGraphicsCurtainItem::Type == getMovingItem()->type()))
{ {
if (suspendedMousePressEvent) if (suspendedMousePressEvent)
{ {
QGraphicsView::mousePressEvent(suspendedMousePressEvent); // suspendedMousePressEvent is deleted by old Qt event loop QGraphicsView::mousePressEvent(suspendedMousePressEvent); // suspendedMousePressEvent is deleted by old Qt event loop
movingItem = NULL; setMovingItem(NULL);
delete suspendedMousePressEvent; delete suspendedMousePressEvent;
suspendedMousePressEvent = NULL; suspendedMousePressEvent = NULL;
bReleaseIsNeed = true; bReleaseIsNeed = true;
} }
else{ else{
if (isUBItem(movingItem) && if (isUBItem(getMovingItem()) &&
DelegateButton::Type != movingItem->type() && DelegateButton::Type != getMovingItem()->type() &&
QGraphicsSvgItem::Type != movingItem->type() && QGraphicsSvgItem::Type != getMovingItem()->type() &&
UBGraphicsDelegateFrame::Type != movingItem->type() && UBGraphicsDelegateFrame::Type != getMovingItem()->type() &&
UBGraphicsCache::Type != movingItem->type() && UBGraphicsCache::Type != getMovingItem()->type() &&
QGraphicsWebView::Type != movingItem->type() && // for W3C widgets as Tools. QGraphicsWebView::Type != getMovingItem()->type() && // for W3C widgets as Tools.
!(!isMultipleSelectionEnabled() && movingItem->parentItem() && UBGraphicsWidgetItem::Type == movingItem->type() && UBGraphicsGroupContainerItem::Type == movingItem->parentItem()->type())) !(!isMultipleSelectionEnabled() && getMovingItem()->parentItem() && UBGraphicsWidgetItem::Type == getMovingItem()->type() && UBGraphicsGroupContainerItem::Type == getMovingItem()->parentItem()->type()))
{ {
bReleaseIsNeed = false; bReleaseIsNeed = false;
if (movingItem->isSelected() && isMultipleSelectionEnabled()) if (getMovingItem()->isSelected() && isMultipleSelectionEnabled())
movingItem->setSelected(false); getMovingItem()->setSelected(false);
else else
if (movingItem->parentItem() && movingItem->parentItem()->isSelected() && isMultipleSelectionEnabled()) if (getMovingItem()->parentItem() && getMovingItem()->parentItem()->isSelected() && isMultipleSelectionEnabled())
movingItem->parentItem()->setSelected(false); getMovingItem()->parentItem()->setSelected(false);
else else
{ {
if (movingItem->isSelected()) if (getMovingItem()->isSelected())
bReleaseIsNeed = true; bReleaseIsNeed = true;
movingItem->setSelected(true); getMovingItem()->setSelected(true);
} }
} }
@ -1394,14 +1401,14 @@ void UBBoardView::mouseReleaseEvent (QMouseEvent *event)
} }
if (mWidgetMoved) { if (mWidgetMoved) {
movingItem->setSelected(false); getMovingItem()->setSelected(false);
movingItem = NULL; setMovingItem(NULL);
mWidgetMoved = false; mWidgetMoved = false;
} }
else { else {
if (suspendedMousePressEvent) { if (suspendedMousePressEvent) {
QGraphicsView::mousePressEvent(suspendedMousePressEvent); // suspendedMousePressEvent is deleted by old Qt event loop QGraphicsView::mousePressEvent(suspendedMousePressEvent); // suspendedMousePressEvent is deleted by old Qt event loop
movingItem = NULL; setMovingItem(NULL);
delete suspendedMousePressEvent; delete suspendedMousePressEvent;
suspendedMousePressEvent = NULL; suspendedMousePressEvent = NULL;
} }
@ -1453,7 +1460,7 @@ void UBBoardView::mouseReleaseEvent (QMouseEvent *event)
mMouseButtonIsPressed = false; mMouseButtonIsPressed = false;
mPendingStylusReleaseEvent = false; mPendingStylusReleaseEvent = false;
mTabletStylusIsPressed = false; mTabletStylusIsPressed = false;
movingItem = NULL; setMovingItem(NULL);
mLongPressTimer.stop(); mLongPressTimer.stop();
emit mouseReleased(); emit mouseReleased();

30
src/board/UBBoardView.h
Unescape View File

@ -156,7 +156,32 @@ private:
bool mWidgetMoved; bool mWidgetMoved;
QPointF mLastPressedMousePos; QPointF mLastPressedMousePos;
QGraphicsItem *movingItem;
/* when an item is moved around, the tracking must stop if the object is deleted */
QGraphicsItem *_movingItem;
QGraphicsItem *getMovingItem() {
return _movingItem;
}
void setMovingItem(QGraphicsItem *item) {
// if the current moving item is a qobject, it MUST be disconnected
if (_movingItem) {
QObject *moving_item_obj = dynamic_cast<QObject*>(_movingItem);
if (moving_item_obj != nullptr)
disconnect(moving_item_obj, &QObject::destroyed, this, &UBBoardView::movingItemDestroyed);
}
// attach the new moving item if relevant
if (item) {
QObject *item_obj = dynamic_cast<QObject*>(item);
if (item_obj != nullptr)
connect(item_obj, &QObject::destroyed, this, &UBBoardView::movingItemDestroyed);
}
_movingItem = item;
}
QMouseEvent *suspendedMousePressEvent; QMouseEvent *suspendedMousePressEvent;
bool moveRubberBand; bool moveRubberBand;
@ -177,11 +202,10 @@ private:
static bool hasSelectedParents(QGraphicsItem * item); static bool hasSelectedParents(QGraphicsItem * item);
private slots: private slots:
void settingChanged(QVariant newValue); void settingChanged(QVariant newValue);
void movingItemDestroyed(QObject* item = nullptr);
public slots: public slots:
void virtualKeyboardActivated(bool b); void virtualKeyboardActivated(bool b);
void longPressEvent(); void longPressEvent();

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