Method mouseMoveEvent

YUViewLib/src/ui/views/MoveAndZoomableView.cpp:295–348

}

void MoveAndZoomableView::mouseMoveEvent(QMouseEvent *mouse_event)
{
  if (mouse_event->source() == Qt::MouseEventSynthesizedBySystem &&
      (this->viewAction == ViewAction::PINCHING || this->viewAction == ViewAction::DRAGGING_TOUCH))
  {
    DEBUG_VIEW("MoveAndZoomableView::mouseMoveEvent ignore system generated touch event");
    mouse_event->ignore();
    return;
  }

  if (mouse_event->buttons() == Qt::NoButton)
  {
    // The mouse is moved, but no button is pressed. This should not be caught here. Maybe a mouse
    // press/release event got lost somewhere. In this case go to the normal mode.
    if (this->viewAction == ViewAction::DRAGGING ||
        this->viewAction == ViewAction::DRAGGING_MOUSE_MOVED ||
        this->viewAction == ViewAction::ZOOM_RECT)
    {
      DEBUG_VIEW("MoveAndZoomableView::mouseMoveEvent no Button - abort any action");
      this->viewAction = ViewAction::NONE;
    }
  }

  if (this->viewAction == ViewAction::DRAGGING ||
      this->viewAction == ViewAction::DRAGGING_MOUSE_MOVED)
  {
    // Calculate the new offset from the center position
    this->setMoveOffset(viewDraggingStartOffset +
                        (mouse_event->pos() - this->viewDraggingMousePosStart));

    if (this->viewAction == ViewAction::DRAGGING)
    {
      auto mouseMoved = viewDraggingMousePosStart - mouse_event->pos();
      if (mouseMoved.manhattanLength() > 3)
      {
        this->viewAction = ViewAction::DRAGGING_MOUSE_MOVED;
        DEBUG_VIEW("MoveAndZoomableView::mouseMoveEvent mouse was moved > 3 pxixels");
      }
    }

    DEBUG_VIEW("MoveAndZoomableView::mouseMoveEvent dragging pos " << mouse_event->pos());
    mouse_event->accept();
    this->update();
  }
  else if (this->viewAction == ViewAction::ZOOM_RECT)
  {
    this->viewZoomingMousePos = mouse_event->pos();
    DEBUG_VIEW("MoveAndZoomableView::mouseMoveEvent zooming pos " << viewZoomingMousePos);
    mouse_event->accept();
    this->update();
  }
  else
    this->updateMouseCursor(mouse_event->pos());
}

void MoveAndZoomableView::mousePressEvent(QMouseEvent *mouse_event)
{