qtquick2

I've got a big number of items that are quite complex (memory-heavy), and in order to fit in limited RAM, I want to cache some of them into textures and not keep the actual complex item in memory. In particular, items for which I want to do that are all those (among my complex items) that do not currently need to animate (and this means most of them). For the purposes of this question I call this kind of items "inactive". My plan was: When an item "foo" becomes inactive: Create dynamically a ShaderEffectSource (with no associated ShaderEffect ) with live: false; source: foo , in the same

I have a c++ class like below and i used this class after registering that in an qml page and that signals works well in qml page class1.cpp QString Class1::message(){ return m_Message; } void Class1::setMessage(QString m){ m_Message=m ; emit messageChanged(); } void Class1::invokeEvent(){ setMessage("The Second Message"); } Class2* Class1::getClass2Obj(){ class2obj.plusplusClickCount(); return &class2obj; } class1.h class Class1 : public QObject { Q_OBJECT QString m_Message; Class2 class2obj; public: explicit Class1(QObject *parent = nullptr); Q_PROPERTY(QString message READ message WRITE

Here's my test code: import QtQuick 2.4 import QtQuick.Window 2.2 Window { visible: true readonly property int defaultWidth: 700 readonly property int defaultHeight: 500 width: defaultWidth height: defaultHeight readonly property real aspectRatio: defaultWidth / defaultHeight readonly property real scaleFactor: width / defaultWidth onWidthChanged: { var properHeight = Math.round(width / aspectRatio); if ( height !== properHeight ) { height = properHeight } } onHeightChanged: { var properWidth = Math.round(height * aspectRatio); if ( width !== properWidth ) { width = properWidth } } TextEdit {

I have some model class that inherits QAbstractListModel : VehiclesModel.h : class VehiclesModel : public QAbstractListModel { Q_OBJECT public: enum Roles { ImagePathRole = Qt::UserRole + 1, // QString NameRole // QString }; virtual int rowCount(const QModelIndex & parent = QModelIndex()) const override { ... } virtual QVariant data(const QModelIndex & index, int role) const override { ... } virtual QHash<int, QByteArray> roleNames() const override { QHash<int, QByteArray> roles = QAbstractListModel::roleNames(); roles[ImagePathRole] = "imagePath"; roles[NameRole] = "name"; return roles; } };