Movable Graphic in further versions of ArcGIS Qt

FatmaAkdemir

I want to ask if there is any feature plan for making the Graphic class movable via mouse move or drag event. It would be nice if we had an interface or a function like setMovable(true) and when we inherit from Graphic, our object would be movable on the map.

JamesBallard1

Hi @FatmaAkdemir. There are some complications with that since it needs to cooperate with the MapView to know when and when not to pan the map in situations like this. Moving a graphic can be done now, although it's not as simple as having a clean interface with something like setMovable(true). I wrote some quick Qt Widgets sample code to show how.

connect(m_map, &Map::doneLoading, this, [this](Error)
{
  m_graphic = new Graphic(Point{0,0}, new SimpleMarkerSymbol(SimpleMarkerSymbolStyle::Square, QColor{Qt::red}, 10, this), this);
  auto overlay = new GraphicsOverlay(this);
  overlay->graphics()->append(m_graphic);
  m_mapView->graphicsOverlays()->append(overlay);
});

m_mapView = new MapGraphicsView(this);

// find the graphic from the clicked point
connect(m_mapView, &MapGraphicsView::identifyGraphicsOverlayCompleted, this, [this](QUuid, IdentifyGraphicsOverlayResult* identifyResult)
{
  const auto graphics = identifyResult->graphics();
  if (graphics.isEmpty())
    return;

  auto g = graphics.first();
  if (g == m_graphic)
  {
    m_movingGraphic = true;
  }
});

// if we found the graphic, start moving it to the new mouse location
connect(m_mapView, &MapGraphicsView::mouseMoved, this, [this](QMouseEvent& mouseEvent)
{
  if (!m_movingGraphic)
    return;

  auto newGeometry = m_mapView->screenToLocation(mouseEvent.x(), mouseEvent.y());
  m_graphic->setGeometry(newGeometry);
});

// "accept" the event to prevent dragging the MapView
// also start an identify to see if we clicked on the graphic
connect(m_mapView, &MapGraphicsView::mousePressed, this, [this](QMouseEvent& mouseEvent)
{
  mouseEvent.accept();
  m_mapView->identifyGraphicsOverlay(m_mapView->graphicsOverlays()->first(), mouseEvent.x(), mouseEvent.y(), 5, false);
});

// stop the dragging
connect(m_mapView, &MapGraphicsView::mouseReleased, this, [this](QMouseEvent&)
{
  m_movingGraphic = false;
}

 

Let me know if this works for your purposes.