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LOCATION STUDIO QT DEVELOPER’S GUIDE

July 2017

Revision Sheet

Revision Sheet
Release No. Date

Revision Description

Rev. 0

Initial Draft

7/13/17

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TABLE OF CONTENTS
OVERVIEW .............................................................................................................................. 1
Getting Started .................................................................................................................... 1
Install QT Creator & Build the plugin .................................................................................... 1
Qt Console Plugin Implementation .......................................................................................... 2
Display Map ........................................................................................................................ 2
Side Menu, Title Bar ............................................................................................................ 3
Keyword Search ................................................................................................................... 3
Category Search................................................................................................................... 4
Recent List and Add/Remove Recent ................................................................................... 5
Favorites List and Add/Remove Favorites ............................................................................ 6
POI Details ........................................................................................................................... 7
Route List ............................................................................................................................ 7
navigationRouteController .................................................................................................. 7
NavigationSession ............................................................................................................... 9
Manuver List ..................................................................................................................... 13
Console Example usage ..................................................................................................... 13
QT Cluster Plugin Implementation ..................................................................................... 14
Display Map ...................................................................................................................... 14
Cluster Example usage ....................................................................................................... 14
Console-Cluster communications Protocol ......................................................................... 15
Cluster-Console communications ....................................................................................... 16

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Qt Developers Guide

OVERVIEW
This document is intended to serve as a reference for Developers as they work on Location
Studio Qt Navigation Console & Cluster Plugin. Both Console and Cluster are Custom QML Type
QQuickItems registered as plugins with User Interface implemented in QML. The document will
fully define the Role of Developer in Location Studio Qt Project.

Getting Started
This section explains how to build and run Location Studio Qt Navigation Console Plugin &
Cluster plugins on Ubuntu 16.04.01 LTS x86 64bit system. You can also find this information in
the Auto Reference Getting Started Guide in this same docs directory.
https://git.location.studio/location.studio/autoNavSDK/blob/master/docs/AutoReference%20G
etting%20Started%20Guide%20R1.0.pdf

Install QT Creator & Build the plugin
1. Download and install QT Creator (Qt Creator 4.3.1 for Linux 64-bit) from
https://www.qt.io/download-open-source/
2.
3.
4.
5.

Open Project file of Location Studio Console Plugin in QT creator.
In QT > Projects > Manage Kits > Build & Run > Kits
Select Auto-Detected kit and create clone of default kit. Rename prefix of kit to LTK-....
Select newly created kit in Manual and change device to Desktop, Change QT Version to
path already copied at /opt folder. (Path: /opt/Qt5.8.0/bin)
6. Build the plugin from QT creator.
7. To install the plugin, Open Terminal/Command Prompt, Go to path_to_project_folder/
make && sudo make install
8. This plugin will be installed in
/opt/Qt5.8.0/qml/com/locationstudio/qtnavigator/plugin_folder

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Qt Console Plugin Implementation
This plugin supports the features of map, navigation and search services. This plugin exposes
the custom qml type ConsoleView. Properties like zoom, tilt and follow-me mode can be set
from ConsoleView. This plugin also offers feature like category search, single search, and
local device store option for recently searched places and it can be added to a favorite list.
While in navigation mode, the application offers a detailed maneuver list with total remaining
time and distance along with direction and street name details for different route options.
Another feature during navigation is the current Speed limit. While navigating if fuel level
reduces to certain low level, alert is shown to redirect to nearest fuel station and after again rerouted to original destination. The plugin has options to view optional layers like satellite view,
traffic view, 3D view and POI.

Display Map
The MapKit3d library used for displaying a map on the home screen. The mLTKMapKit object
of MapWidget class is initialized in MapViewController::init() and added to main
layout in MainViewController::init() to display the map. The
MapViewController::SetupMapWidget() function has direct slots pertaining to
MapWidget.

No.

Slot

Description

1

OnMapCreated()

Here the map’s zoom, tilt, reference center, avatar position,
setnightmode option and map decoration parameters like
zoom, follow me and compass button are set.

2

OnLayersCreated()

3

GetPinInfo( const
locationtoolkit::Pin*)

4

onCameraUpdated( const
locationtoolkit::CameraPa
rameters&)

Here the layer options button is enabled and the zoom and
layer button visibility is set.
Signal SignalPinInfoClicked() is emitted if navigation
is started. This signal is connected to
mCategorySearchController slot GetPinInfo()
where pininfo is updated and displayed with complete
information with DetailViewcontroller:show().
Camera position is updated to be set for map center.

5

onPolylineClicked( const
QList)

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If Navigation is not started then make all polylines passive else
active/raise the selected polyline.

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Side Menu, Title Bar
The Titlebar is created in TitleBarcontroller and called in
MainViewController::init(). Height, Width and position for the Titlebar are set from
MainViewController. UI customizations are done in TitleBar.qml. Side menu button
option, Keyword search & settings button option are added in Titlebar and signals are
emitted from qml and connected to slots in MainViewController for all the options.
No.
1

2

3

Slot

Description

onSettingsButtonClicked()

SettingControllerMenu is created, width,
height and parent is set in setup method
SettingController.qml is created that has UI.

onSearchButtonClicked(const
QString &searchString)

onMenuClicked()

Search category is set to ‘all’ and string is passed to
mCategorySearchController>mainBarSearchSDKRequest(parameter,s
earchString); in
CategorySearchController.
HamburgerControllerMenu is created,
width,height and parent is set and in setup method
HamburgerMenu.qml is created that has UI.

Keyword Search
Keyword search can be performed by entering search string from Title bar text field. If user
types 3 characters, app redirects to TitleBar.qml signal showSuggestedSearch()
that connects to signal onSeacrhButtonClicked() in MainViewController and
there to slot ManiViewController::onSearchButtonClicked().
mCategorySearchController Object of CategeorySearchController class
initialized in function MainViewController::
InitializeCategoryController(), Fuel.qml is the UI customization file in
which Listview for search result is created and signals are emitted for which slots are in
CategeorySearchController.

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No.

Slot

Description

1

onClearAllResentsClicked()

Calls PlaceManager::
clearAllRecents() which deletes data in
recent.json.

2

onClearAllFavouritesClicked ()

Calls PlaceManager::
clearAllFavorites
() which deletes data in favorites.json.

onDeleteSelectiveFav (QString
latitude,QString longitude)

Calls PlaceManager::
deleteExistingFavConfig() which
searches for the matched data and deletes the
same from favorites.json. and that
particular favorite[index].json

on_mapToggleButton_clicked()

For the search result,
locationtoolkit::PinParameters are
filed and passed to mLTKMapKit>CreatePin(pinpara); and shown on map.

3

4

5

6

7

onStartNavigationClicked(int)

onLoadListDetail(int itemData)

loadMoreSearchSDKRequest()

Index is used to save data in recent list
placeManager->addToRecents(), and
signal
SignalNavigationButtonClicked() is
emitted which is connected in
mapviewcontroller::OnStartNavigati
onToDestination()
Index is used to save data in recent list
placeManager->addToRecents(), and
SerachDetailsController::show() is
called and related data is passed to
mDetailInfoView.
locationtoolkit::SingleSearchReque
st::createRequest() is passed with
SD_Next parameter and
onSearchSuccess() slot more results are
loaded

Category Search
Category search can be performed by click on side menu from home screen, Click on ‘Near Me’
option, Select any category from list or major categories like Theaters, Gasoline are listed in the
listview of Hamburger menu along with Favorite and Recent List.
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HamburgerMenu.qml has signals that connects to slots in
CategorySearchController::onCategorySearchSelected() with category
parameter code.
Slots in Hamburger Menu emits signal to connect to CategorySearchController.
No.

1

2

3

4

5

Slot

Description

onNearMeButtonClicked()

NearControllerMenu is created, width,height
and parent is set and in setup method
NearMeController.qml is created that has UI.
Signal nearMeItemsClicked() from UI is
connected to slot onNearMeItemsClicked()
which emits signal
CategorySearchSelected() which is
connected to slot in category
onCategorySearchSelected() with category
parameter code.

onMoviesButtonClicked()

onGasStationButtonClicked()

onFavouritesButtonClicked()

onRecentsButtonClicked()

signal CategorySearchSelected() which is
connected to slot in category
onCategorySearchSelected() with category
parameter code. for movies.
signal CategorySearchSelected() which is
connected to slot in category
onCategorySearchSelected() with category
parameter code for GasStation.
Signal FavouriteButtonClicked() is emitted
with is connected to
CategorySearchController::displayExi
stingFavourites() in
MainViewController::onMenuClicked().
Signal RecentButtonClicked() is emitted with
is connected to
CategorySearchController::
displayExistingRecents() in
MainViewController::onMenuClicked().

Recent List and Add/Remove Recent
Recent List is shown Home screen > Hamburger menu > Recent.
CategorySearchController is used to show Recent List.
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Slots used for Recent are:
No.

Slot

Description

1

CategorySearchController::disp
layExistingRecents()

Defined in CategorySearchController. This
function updates recents in listview
ofCategorySearchController.

2

3

CategorySearchController::
onClearAllResentsClicked()

PlaceManager::addToRecents()

This slot is defined in
CategorySearchController. It will show
confirmation alert to user for deleting all Recents. On
click Yes from confirmation alert,
placeManager::clearAllRecents()
method will be called that will clear all entries in local
files.
Defined in PlaceManager. This method is
executed when POI details are shown. Used to Add
POI to recent. This slot internally calls
PlaceManager::writeRecentsConfig to
save POI details to file and make entry in recents file.

Favorites List and Add/Remove Favorites
Favorites List is shown Home screen > Hamburger menu > Favorites.
CategorySearchController is used to show Favorites List.
Slots used for Favorites:
No.

Slot

Description

1

CategorySearchController::
displayExistingFavourites()

Defined in CategorySearchController. This
function updates favorites in listview of
CategorySearchController.

CategorySearchController::
onClearAllFavouritesClicked

This slot is defined in
CategorySearchController. It will show a
confirmation alert to the user for deleting all
favorites. On click Yes from confirmation alert,
placeManager::clearAllFavourite()
method will be called that will clear all entries in local
files.

2

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POI Details
POI Details are shown by clicking on any row from a keyword search or category search list view
or tapping on any pin from the map.
mDetailInfoView Object of SearchDetailsController class initialized in function
CategorySearcController::setUp().
Height, Width and parent for SearchDetails are set from
CategorySearchController and in SearchDetailsController::setup().
FuelDetails.qml is created that has UI and signals that are emitted which are connected
in SearchDetailsController and CategorySearchController depending on the
signals.
POI details button click slots are:
No.

Slot

Description

onNavigationButtonClicked(
QString, int, QVariant)

Emits signal SignalNavigationButtonClicked()
which calls slot in
MapViewController::OnStartNavigationToDes
tination to start fetching routes for
navigation.

2

on_callButton_clicked(QStr
ing, QString,QString)

Show call screen. CallViewController is used for
simulating call screen. CallViewController
::setup() will create CAllPOI.qml which will have UI
for call screen and signal callEndButton() that would
be connected to slot
CallViewController::on_call_endButton_cli
cked() to clear call screen. And end call

3

onMapButtonClicked

Toggle between POI details and Map screen.

1

4

onFoundCustomFavourite()

Used to add or remove POI location to favorite
listplaceManager::addToFavorites,
placeManager->removeFromFavorites. And check
Favorite.json to show if Item is already added to list
then mark it as Favorite.

Route List
navigationRouteController
From POI details screen, On click of navigation button, the Route List on the left side of the
home screen and route paths are displayed on the Map. Class
navigationRouteController is used to show route list.

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mNavigationRoutesController object of navigationRouteController class
initialized in function MapViewController::setupNavigationRouteController.
In navigationRouteController::setup(),
NavigationRouteController.qml is created that has the UI for Route selection.
Signals for selected route index are emitted from navigationRouteController to
connect to slots MapViewController::onStartNavigationOnRoute() where route
polyline, maneuver details and compass are updated and signals for
startNavigationOnRoute() is emitted which is connected to
NavigationSession::onStartNavigationOnRoute().
To fetch route information, the mNavigationImpl Object of NavigationSession class
is used. NavigationSession class uses NavKit SDK to get route information as well as
Maneuver updates and direction updates. NavigationSession emits appropriate signals
which call slots of MapViewController and it in turn it calls slots of
navigationRouteController to update route list UI.
Slots/Functions used in navigationRouteController are:
No.

1

2

Slot

onRouteFirstClicked()
onRouteFirstGoClicked()

onRouteSecondClicked()
onRouteSecondGoClicked()

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Description
Emits signal startNavigationOnRoute() with index
which calls slot in MapViewController::
onStartNavigationOnRoute() that sets
cameraposition, add polyline, set compass and emit signal
startNavigationOnRoute() that is connected to
NavigationSession::onStartNavigationOnRoute(
) where RouteInformation is passed to
mNavigationImpl::SetActiveRoute for index 0.
Emits signal startNavigationOnRoute() with index
which calls slot in MapViewController::
onStartNavigationOnRoute() that sets
cameraposition, add polyline, set compass and emit signal
startNavigationOnRoute() that is connected to
NavigationSession::onStartNavigationOnRoute(
)where RouteInformation
is passed to mNavigationImpl::SetActiveRoute for
index 1.

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3

onRouteThirdClicked()
onRouteThirdGoClicked()

Emits signal startNavigationOnRoute() with index
which calls slot in
MapViewController::onStartNavigationOnRoute(
) that sets cameraposition, add polyline, set compass and
emit signal startNavigationOnRoute() that is connected
to
NavigationSession::onStartNavigationOnRoute(
)where RouteInformation is passed to
mNavigationImpl::SetActiveRoute for index 2.

NavigationSession
NavgationSession class is used to get route list, maneuvers list, direction arrow images,
navigation remaining distance, remaining times, next road, current road related updates using
NavKit SDK.
mNavigationImpl object of this class is initialized in MapViewController().
Slots assigned in NavigationSession are:
No.

Slot

Description

1

OnStartNavigation(LTKContext&
ltkcontext, const Place& place,
const RouteOptions&
routeoption, const Preferences&
preference)

Slot executed from mapviewcontroller to
initialize Navigation Object (mNavigationImpl) of
NavKit SDK and fetch routes. This object is used to
assign slots to session signals and navigation related
signals.

2

OnStopNavigation()

To stop navigation session and location updates.
Executed from mapviewcontroller.

3

OnUpdateGpsFile(QString
gpsfile)

To update gps file path which will be used for
navigation simulation and location updates. Executed
from mapviewcontroller.

4

onStartNavigationOnRoute(int
routeIdx)

Executed from mapviewcontroller class,
Navigation object sets specified route as active route
for location and navigation

5

NavigationSession::modifyLocati
onServices(bool startService)

To start/stop location updates.

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Slots assigned for session signals are:
No.

Slot

Description

1

OnOffRoute()

Emit when the locations being received by the
navigation session are not considered on route to
destination.

2

OnRoute()

Emit when the locations being received by the
navigation session are considered on route to
destination.

3

OnRouteReceived(RouteRequestRea
son reason, const
QVector >& routes)

Emit when received the list of possible routes for the
current navigation session. It emits
addPolyLinesForPath(reason, routes)
signal which will add polylines to map for received
routes in MapViewController.

4

OnRouteRequested(RouteRequestRe
ason reason)

Emit when new route requested

5

OnRouteProgress(qint32
progress)

Emit when the route generation in progress

6

OnRouteError(LTKError error)

Emits when there is any error in getting routes details

7

OnArrivingToDestination(Destina
tionStreetSide streetSide)

Emit when the current navigation arriving to
destination.

8

OnRouteFinish()

Emit when the current navigation session ends. The
client will not receive any route updates.

9

OnOffRoutePositionUpdate(qreal
headingToRoute)

Emit when the heading to origin off route.

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Slots assigned for navigation update signals:
No.

Slot

Description

1

OnTripRemainingTime(quint32
time)

Emit when trip remaining time updated. It calls
appropriate slot in MapViewController to
update total trip time label in
ManeuverDetailController &
ManeuverListController

2

OnTripRemainingDelay(quint32
time)

Emit when trip remaining delay updated

3

OnTripRemainingDistance(const
qreal& distance)

Emit when trip remaining distance updated. It calls
appropriate slot in MapViewController to
update distance in
ManeuverDetailController &
ManeuverListController.

4

OnCurrentRoadName(const
QString& primaryName, const
QString& secondaryName)

Emit when the name of current road updated. Used
to update current road name label in
ManeuverDetailController &
ManeuverListController.

5

OnManeuverExitNumber(const
QString& exitNumber)

Emit when the exit number of current maneuver
updated.

6

OnNextRoadName(const QString&
primaryName, const Qstring&
secondaryName)

Emit when the name of next road updated. Used to
update next road name label in
ManeuverDetailController.

7

OnManeuverType(const Qstring&
Type)

Emit when the type of current updated.

8

OnManeuverRemainingTime(quint32
time)

Emit when remaining time of maneuver updated.
Used to update current maneuver remaining time
label in ManeuverDetailController.

9

OnManeuverRemainingDelay(quint3
2 delay)

Emit when the remaining time delay of current
maneuver updated.

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10

OnManeuverRemainingDistance(con
st qreal& distance)

Emit when the remaining distance of the current
maneuver updated. Used to update current
maneuver remaining distance label in
ManeuverDetailController.

11

OnManeuverImageId(const
Qstring& imageId)

Emit when maneuver image ID returned. Use
MapUtils for getting bitmap.

12

OnStackTurnImageTTF(const
Qstring& stackImageTTF)

Emit when the stack maneuver of turn image text
returned. Used to update direction image in
ManeuverDetailController.

13

OnPositionUpdated(const
Coordinates& coordinates,
qint32 speed, qint32 heading)

Emit when position on route has been changed.

14

OnManeuverPoint(const
Coordinates& point)

Emit when the turn point coordinate of maneuver
changed.

15

OnUpdateManeuverList(const
ManeuverList& maneuvers)

Emit when updating upcoming maneuver list when
maneuver changed.

Slots assigned for Traffic and announcement signal are:
No.

Slot

Description

1

OnTrafficChanged(const
TrafficInformation&
trafficInfo)

Emit when traffic information is updated

2

OnDisableTrafficAlerted()

Emit when disable the traffic alert.

3

OnSpeedLimit(const
SpeedLimitInformation&
speedInfo)

Emit when Speed Limit Updated.

4

OnLaneInformation(const
locationtoolkit::LaneInformatio
n& laneInfo)

Emit when Lane Information Updated.

5

OnTripTrafficColor(char color)

Emit when Traffic color updated.

6

OnRoadSign(const
locationtoolkit::RoadSign&
roadSign)

Emit when Road Sign updated.

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Qt Developers Guide

7

OnAnnounce(Announcement
*announcement)

Provides the announcement related information
output stream to get audio data to be played audio
text for TTS support

Manuver List
While onNavigation > click Menu button on top right corner, Complete Manuver List of current
navigation route is displayed with Destination name, time remaining and distance remaining on
header and direction & placeName list.
mManeuversListController object of ManeuversListController class initialized
in function MapViewController::setupManeuverListSignalAndSlots().In
ManeuversListController::setup(), ManeuverListView.qml is created that has UI
for Maneuver List.
Slots for mManeuversListController are connected in
MapViewController::setupManeuverListSignalAndSlots():
No.

Slot

Description

1

OnTripRemainingTime(quint
32 time)

Emit when trip remaining time updated. It calls appropriate slot
in MapViewController to update total trip time label in
ManeuverDetailController &
ManeuverListController

2

OnTripRemainingDistance(q
real)

Emit when trip remaining distance updated. It calls appropriate
slot in MapViewController to update distance in
ManeuverDetailController &
ManeuverListController.

Console Example usage
import com.locationstudio.qtnavigator.console 1.0
ConsoleView {
width: 1024
height: 768
zoom: 17
tilt: 45
isFollowMe: true
workFolder: "/opt/locationstudio/res/console"
token: “”
}

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QT Cluster Plugin Implementation
This plugin supports features of a map integrated with navigation services. This plugin exposes
the custom qml type ClusterView. Properties like zoom, tilt and follow me mode can be set
from ClusterView. Apart from the map, while in navigation mode, the plugin offers
maneuver details with remaining time and distance along with direction and street name
details for given route. Also displays the current Speed limit.

Display Map
MapKit3d library used for displaying map on home screen. mLTKMapKit object of
MapWidget class is initialized in MapView::init() to display map. Slot pertaining to map
is in the init() method.
No.

Slot

Description

1

onMapReady()

Here map’s zoom, tilt, reference center, avatar position,
setnightmode option and map decoration parameters like
zoom, follow me and compass button are set.

Slots for low fuel alert:
No

Slot

Description

1

onLowFuelAlert()

Signal lowFuelLimit is emitted from ConfimationBox.qml that
is connected to mapview. Here showFuelAlert API is exposed
on Dbus.

Cluster Example usage
import com.locationstudio.qtnavigator.cluster 1.0
ClusterView {
id: map2
workFolder: "/opt/locationstudio/res/cluster"
zoom: 17.0
tilt: 15.0
avatarPosition.x: -118.25
avatarPosition.y: 34.05
avatarHeading: 0.0
isFollowMe: true
token: 
}

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Console-Cluster communications Protocol
D-Bus is used as the interface for communication from Console to Cluster. Any module that
registers for these interfaces will be notified of that information.
No.

Slots

Description

Q_SCRIPTABLE QString
onManeuverUpdated(const QString&
1

maneuverIcon, const QString&
sreetName, const QString&

Notified when there is update for current
Maneuver during navigation.

distance, const QString&
trafficWarning);
Q_SCRIPTABLE QString
2

updateRemainingManeuverDistance(co
nst QString& distance);

Notified when there is update for current
Maneuver distance during navigation.

Q_SCRIPTABLE QString
3

updateGpsPosition(const QString&
lat, const QString& lon, const

Notified when there is update in gps position.

QString& heading);
Q_SCRIPTABLE QString
setNavigationMode(bool navMode);
4

Q_SCRIPTABLE bool
onUpdateSpeedLimit(const QString&

This notifies about an active navigation session.
This notifies about speed limit during navigation

speedLimit)

5

6

Q_SCRIPTABLE bool updatePolyline

This notifies about polyline update during

(const QString &polyline)

navigation.

Q_SCRIPTABLE bool clearPolyline ()

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This notifies to clear polyline while navigation
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Q_SCRIPTABLE bool
7

updateManeuverArrow (const QString
&pts)

Notified when there is update for maneuver
arrow on polyline during navigation.

Cluster-Console communications
D-Bus is used as the interface for communication from the Cluster to Console. Any module that
registers for these interfaces will be notified of that information.
1. When Fuel Alert is notified, mAlert object with option to navigate to
nearest Fuel station is shown on console created in MapViewController.
2. Slot onAlertBoxValueClicked() calls method
MapviewController::fuelAlertAcceptClicked() which emits
fuelSearchRequest(parameter) that is connected to
CategorySearchController::onFuelSearchRequest(QVaria
nt info) where search request is raised for nearest fuel station.
3. When navigation to fuel station ends, navigationSession emits
RouteFinish() signal that is connected in mapviewcontroller::
OnRouteFinish(), where ConfirmBoxController is called and user
is asked to continue with previous destination. If user agrees, then
MapViewController::startNavigationWithNavKit() is called.
Following is the slot in Console:
No.
1

Slots
Q_SCRIPTABLE QString
showFuelAlert(bool Mode)

Description
This notifies that fuel level is low.

For help and any questions, please contact support@location.studio.

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