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// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qdeclarativegeomapitemgroup_p.h"
#include "qdeclarativegeomapitembase_p.h"
#include "qdeclarativegeomap_p.h"
QT_BEGIN_NAMESPACE
/*!
\qmltype MapItemGroup
\instantiates QDeclarativeGeoMapItemGroup
\inqmlmodule QtLocation
\ingroup qml-QtLocation5-maps
\since QtLocation 5.9
\brief The MapItemGroup type is a container for map items.
Its purpose is to enable code modularization by allowing the usage
of qml files containing map elements related to each other, and
the associated bindings.
\note The release of this API with Qt 5.9 is a Technology Preview.
\section2 Example Usage
The following snippet shows how to use a MapItemGroup to create a MapCircle, centered at
the coordinate (63, -18) with a radius of 100km, filled in red, surrounded by an ondulated green border,
both contained in a semitransparent blue circle with a MouseArea that moves the whole group.
This group is defined in a separate file named PolygonGroup.qml:
\code
import QtQuick 2.4
import QtPositioning 5.6
import QtLocation 5.9
MapItemGroup {
id: itemGroup
property alias position: mainCircle.center
property var radius: 100 * 1000
property var borderHeightPct : 0.3
MapCircle {
id: mainCircle
center : QtPositioning.coordinate(40, 0)
radius: itemGroup.radius * (1.0 + borderHeightPct)
opacity: 0.05
visible: true
color: 'blue'
MouseArea{
anchors.fill: parent
drag.target: parent
id: maItemGroup
}
}
MapCircle {
id: groupCircle
center: itemGroup.position
radius: itemGroup.radius
color: 'crimson'
onCenterChanged: {
groupPolyline.populateBorder();
}
}
MapPolyline {
id: groupPolyline
line.color: 'green'
line.width: 3
function populateBorder() {
groupPolyline.path = [] // clearing the path
var waveLength = 8.0;
var waveAmplitude = groupCircle.radius * borderHeightPct;
for (var i=0; i <= 360; i++) {
var wavePhase = (i/360.0 * 2.0 * Math.PI )* waveLength
var waveHeight = (Math.cos(wavePhase) + 1.0) / 2.0
groupPolyline.addCoordinate(groupCircle.center.atDistanceAndAzimuth(groupCircle.radius + waveAmplitude * waveHeight , i))
}
}
Component.onCompleted: {
populateBorder()
}
}
}
\endcode
PolygonGroup.qml is now a reusable component that can then be used in a Map as:
\code
Map {
id: map
PolygonGroup {
id: polygonGroup
position: QtPositioning.coordinate(63,-18)
}
}
\endcode
\image api-mapitemgroup.png
*/
QDeclarativeGeoMapItemGroup::QDeclarativeGeoMapItemGroup(QQuickItem *parent)
: QQuickItem(parent)
{
connect(this, &QQuickItem::opacityChanged,
this, &QDeclarativeGeoMapItemGroup::mapItemOpacityChanged);
}
QDeclarativeGeoMapItemGroup::~QDeclarativeGeoMapItemGroup()
{
}
void QDeclarativeGeoMapItemGroup::setParentGroup(QDeclarativeGeoMapItemGroup &parentGroup)
{
m_parentGroup = &parentGroup;
connect(m_parentGroup, &QDeclarativeGeoMapItemGroup::mapItemOpacityChanged,
this, &QDeclarativeGeoMapItemGroup::mapItemOpacityChanged);
}
void QDeclarativeGeoMapItemGroup::setQuickMap(QDeclarativeGeoMap *quickMap)
{
if (!quickMap && m_quickMap)
m_quickMap->disconnect(this);
m_quickMap = quickMap;
if (m_quickMap) {
onMapSizeChanged();
connect(m_quickMap, &QQuickItem::widthChanged, this, &QDeclarativeGeoMapItemGroup::onMapSizeChanged);
connect(m_quickMap, &QQuickItem::heightChanged, this, &QDeclarativeGeoMapItemGroup::onMapSizeChanged);
}
}
QDeclarativeGeoMap *QDeclarativeGeoMapItemGroup::quickMap() const
{
return m_quickMap;
}
qreal QDeclarativeGeoMapItemGroup::mapItemOpacity() const
{
return ((m_parentGroup) ? m_parentGroup->mapItemOpacity() : 1.0) * opacity();
}
void QDeclarativeGeoMapItemGroup::classBegin()
{
QQuickItem::classBegin();
}
void QDeclarativeGeoMapItemGroup::componentComplete()
{
QQuickItem::componentComplete();
// In certain cases the parent won't be set via the constructor, but rather later on
// during the instantiation/incubation process.
// Therefore calling setParentGroup here, when the parent is known.
// The childrenChanged use case to handle dynamically-added items is currently unsupported.
const QList<QQuickItem *> &quickKids = childItems();
for (QQuickItem *k : quickKids) {
QDeclarativeGeoMapItemGroup *childGroup
= qobject_cast<QDeclarativeGeoMapItemGroup *>(k);
if (childGroup) {
childGroup->setParentGroup(*this);
continue;
}
QDeclarativeGeoMapItemBase *childItem
= qobject_cast<QDeclarativeGeoMapItemBase *>(k);
if (childItem) {
childItem->setParentGroup(*this);
continue;
}
}
}
void QDeclarativeGeoMapItemGroup::onMapSizeChanged()
{
setWidth(m_quickMap->width());
setHeight(m_quickMap->height());
}
QT_END_NAMESPACE
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