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The memory management of the quadrant widgets is a total mess: When setting the widget, the QSplitters take ownership, which means that they will delete the widget in their destructor. This is inherently incompatible with singletons, which must not be deleted. To avoid all these troubles, remove the widgets from the QSplitters in the desctructor of the MainWindow. This of course means that we now have to take care about deletion of the widgets. For local widgets use std::unique_ptr, for singletons use a static variable that is deleted on application exit. Sadly, for the map widget we can't use a normal singleton, because the QML MapWidget's memory management is buggy. Add a comment in the source code explaining this. Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
138 lines
4.2 KiB
C++
138 lines
4.2 KiB
C++
// SPDX-License-Identifier: GPL-2.0
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#include <QQmlContext>
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#include <QDebug>
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#include <QQuickItem>
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#include <QModelIndex>
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#include "mapwidget.h"
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#include "core/divesite.h"
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#include "core/selection.h"
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#include "map-widget/qmlmapwidgethelper.h"
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#include "qt-models/maplocationmodel.h"
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#include "qt-models/divelocationmodel.h"
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#include "commands/command.h"
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static const QUrl urlMapWidget = QUrl(QStringLiteral("qrc:/qml/MapWidget.qml"));
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static const QUrl urlMapWidgetError = QUrl(QStringLiteral("qrc:/qml/MapWidgetError.qml"));
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static bool isReady = false;
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#define CHECK_IS_READY_RETURN_VOID() \
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if (!isReady) return
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MapWidget *MapWidget::m_instance = NULL;
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MapWidget::MapWidget(QWidget *parent) : QQuickWidget(parent)
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{
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m_rootItem = nullptr;
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m_mapHelper = nullptr;
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setResizeMode(QQuickWidget::SizeRootObjectToView);
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connect(this, &QQuickWidget::statusChanged, this, &MapWidget::doneLoading);
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connect(&diveListNotifier, &DiveListNotifier::divesChanged, this, &MapWidget::divesChanged);
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connect(&diveListNotifier, &DiveListNotifier::dataReset, this, &MapWidget::reload);
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setSource(urlMapWidget);
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}
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void MapWidget::doneLoading(QQuickWidget::Status status)
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{
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// the default map widget QML failed; load the error QML.
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if (source() == urlMapWidget && status != QQuickWidget::Ready) {
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qDebug() << urlMapWidget << "failed to load with status:" << status;
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setSource(urlMapWidgetError);
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return;
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} else if (source() == urlMapWidgetError) { // the error QML finished loading.
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return;
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}
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isReady = true;
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m_rootItem = qobject_cast<QQuickItem *>(rootObject());
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m_mapHelper = rootObject()->findChild<MapWidgetHelper *>();
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connect(m_mapHelper, &MapWidgetHelper::selectedDivesChanged, this, &MapWidget::selectedDivesChanged);
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connect(m_mapHelper, &MapWidgetHelper::coordinatesChanged, this, &MapWidget::coordinatesChanged);
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}
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void MapWidget::centerOnDiveSite(struct dive_site *ds)
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{
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CHECK_IS_READY_RETURN_VOID();
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m_mapHelper->centerOnDiveSite(ds);
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}
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void MapWidget::centerOnIndex(const QModelIndex& idx)
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{
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CHECK_IS_READY_RETURN_VOID();
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dive_site *ds = idx.model()->index(idx.row(), LocationInformationModel::DIVESITE).data().value<dive_site *>();
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if (!ds || ds == RECENTLY_ADDED_DIVESITE || !dive_site_has_gps_location(ds))
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m_mapHelper->centerOnSelectedDiveSite();
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else
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centerOnDiveSite(ds);
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}
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void MapWidget::reload()
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{
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CHECK_IS_READY_RETURN_VOID();
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m_mapHelper->reloadMapLocations();
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m_mapHelper->centerOnSelectedDiveSite();
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}
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bool MapWidget::editMode() const
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{
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return isReady && m_mapHelper->editMode();
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}
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void MapWidget::setSelected(const QVector<dive_site *> &divesites)
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{
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CHECK_IS_READY_RETURN_VOID();
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m_mapHelper->setSelected(divesites);
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}
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void MapWidget::selectionChanged()
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{
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CHECK_IS_READY_RETURN_VOID();
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m_mapHelper->selectionChanged();
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m_mapHelper->centerOnSelectedDiveSite();
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}
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void MapWidget::selectedDivesChanged(const QList<int> &list)
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{
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CHECK_IS_READY_RETURN_VOID();
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// We get a list of dive indices, but the selection code wants a list of dives.
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// Therefore, transform them here.
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std::vector<dive *> selection;
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selection.reserve(list.size());
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for (int idx: list) {
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if (dive *d = get_dive(idx))
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selection.push_back(d);
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}
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setSelection(selection, current_dive);
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}
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void MapWidget::coordinatesChanged(struct dive_site *ds, const location_t &location)
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{
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Command::editDiveSiteLocation(ds, location);
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}
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void MapWidget::divesChanged(const QVector<dive *> &, DiveField field)
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{
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if (field.divesite)
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reload();
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}
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// Sadly, for reasons out of our control, we can't use a normal singleton for the
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// map widget: In a standard singleton, the object is freed after main() exits.
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// However, if there is an animation running (map zooming), the thread is
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// terminated, when the QApplication object is destroyed, which is before main()
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// exits. The thread has a QQmlAnimationTimer that is freed. However, the map widget
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// then tries to free the object itself, leading to a crash. Clearly, a bug in
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// the QML MapWidget / QtQuick ecosystem.
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// To solve this, the mainwindow will destroy the map widget and in the destructor
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// the reference is cleared. Sad.
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MapWidget::~MapWidget()
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{
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m_instance = NULL;
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}
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MapWidget *MapWidget::instance()
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{
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if (m_instance == NULL)
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m_instance = new MapWidget();
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return m_instance;
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}
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