View in QML C++ View on GitHub Sample viewer app
Show a callout with the latitude and longitude of user-tapped points.
Use case
Callouts are used to display temporary detail content on a map. You can display text and arbitrary UI controls in callouts.
How to use the sample
Tap anywhere on the map. A callout showing the WGS84 coordinates for the tapped point will appear.
How it works
Listen for mouseClicked signal on the map view.
When the user taps, get the tapped location using the mouseEvent x and y coordinates, MapQuickView::screenToLocation(mouseEvent.pos().x(), mouseEvent.pos().y()).
Create a string to display the coordinates; note that latitude and longitude in WGS84 map to the Y and X coordinates.
Create a new callout definition using a title and the coordinate string.
Display the callout by calling setVisible and setLocation on the CalloutData.
Relevant API
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
Use dark colors for code blocks Copy
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
// [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
# include "ShowCallout.h"
# include "Map.h"
# include "MapQuickView.h"
# include "CalloutData.h"
# include "MapTypes.h"
# include "MapViewTypes.h"
# include "SpatialReference.h"
# include "Point.h"
# include "Viewpoint.h"
# 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. pos (). x (), mouseEvent. pos (). 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 );
}
});
}
