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Show callout | ArcGIS Maps SDK for Qt

View on GitHub Sample viewer app

Show a callout with the latitude and longitude of user-tapped points.

Callouts are used to display temporary detail content on a map. You can display text and arbitrary UI controls in callouts.

Tap anywhere on the map. A callout showing the WGS84 coordinates for the tapped point will appear.

1. Listen for mouseClicked signal on the map view.
2. When the user taps, get the tapped location using the mouseEvent x and y coordinates, MapQuickView::screenToLocation(mouseEvent.position().x(), mouseEvent.position().y()).
3. Create a string to display the coordinates; note that latitude and longitude in WGS84 map to the Y and X coordinates.
4. Create a new callout definition using a title and the coordinate string.
5. Display the callout by calling setVisible and setLocation on the CalloutData.

• CalloutDefinition
• GeometryEngine::project
• GeoViewTappedEventArgs
• MapView::geoViewTapped
• MapView::showCalloutAt

balloon, bubble, callout, flyout, flyover, info window, popup, tap

ShowCallout.cpp ShowCallout.cpp ShowCallout.h ShowCallout.qml

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// [WriteFile Name=ShowCallout, Category=DisplayInformation]
// [Legal]
// Copyright 2016 Esri.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// [Legal]

#ifdef PCH_BUILD
#include "pch.hpp"
#endif // PCH_BUILD

// sample headers
#include "ShowCallout.h"

// ArcGIS Maps SDK headers
#include "CalloutData.h"
#include "Map.h"
#include "MapQuickView.h"
#include "MapTypes.h"
#include "MapViewTypes.h"
#include "Point.h"
#include "SpatialReference.h"
#include "Viewpoint.h"

// Qt headers
#include <QImage>

using namespace Esri::ArcGISRuntime;

ShowCallout::ShowCallout(QQuickItem* parent):
  QQuickItem(parent)
{
}

ShowCallout::~ShowCallout() = default;

void ShowCallout::init()
{
  qmlRegisterType<MapQuickView>("Esri.Samples", 1, 0, "MapView");
  qmlRegisterType<ShowCallout>("Esri.Samples", 1, 0, "ShowCalloutSample");
  qmlRegisterUncreatableType<CalloutData>("Esri.Samples", 1, 0, "CalloutData", "CalloutData is an uncreatable type");
}

void ShowCallout::componentComplete()
{
  QQuickItem::componentComplete();

  // find QML MapView component
  m_mapView = findChild<MapQuickView*>("mapView");
  m_mapView->setWrapAroundMode(WrapAroundMode::Disabled);

  // Create a map using the topographic basemap
  m_map = new Map(BasemapStyle::ArcGISTopographic, this);
  m_map->setInitialViewpoint(Viewpoint(Point(-1.2e7, 5e6, SpatialReference::webMercator()), 1e7));

  // Set map to map view
  m_mapView->setMap(m_map);

  //! [initialize callout]
  m_mapView->calloutData()->setVisible(false);
  m_mapView->calloutData()->setTitle("Location");
  QImage image(":/Samples/DisplayInformation/ShowCallout/RedShinyPin.png");
  m_mapView->calloutData()->setImage(image);
  //! [initialize callout]

  // display callout on mouseClicked
  connect(m_mapView, &MapQuickView::mouseClicked, this, [this](QMouseEvent& mouseEvent){
    if (m_mapView->calloutData()->isVisible())
      m_mapView->calloutData()->setVisible(false);
    else
    {
      // set callout position
      Point mapPoint(m_mapView->screenToLocation(mouseEvent.position().x(), mouseEvent.position().y()));
      m_mapView->calloutData()->setLocation(mapPoint);

      // set detail as coordinates formatted to decimal numbers with precision 2
      m_mapView->calloutData()->setDetail("x: " + QString::number(mapPoint.x(), 'f', 2) + " y: " + QString::number(mapPoint.y(), 'f', 2));
      m_mapView->calloutData()->setVisible(true);
    }
  });
}

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