QAbstractListModel insertRows not working properly
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Greetings All,
I have a subclass of QAbstractListModel and attached this model subclass with GridView. When I remove rows from my subclass, the GridView gets updated but when I insert rows in the model the GridView does not gets updated. I have implemented the removeR
I have a very simple subclass of QAbstractListModel and I have attached with it a QML GridView. I have two buttons Add/Remove on the GUI. Pressing Add adds a string to the model and gui updated and pressing remove removes last string from the model and gui updates. My problem is when I add only one row is inserted and when I remove nothing happens on the GUI. Given is the implementation of my model subclass and QML file.
namesmodel.cpp
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NamesModel::NamesModel(QObject *parent) :
QAbstractListModel(parent)
{
QHash<int, QByteArray> roles;
roles[Qt::UserRole + 1] = "name";
setRoleNames(roles);
}
int NamesModel::rowCount(const QModelIndex &parent) const
{
return this->namesList.count();
}
QVariant NamesModel::data(const QModelIndex &index, int role) const
{
if (!index.isValid())
return QVariant();switch(role) { case (Qt::UserRole + 1): return this->namesList.at(index.row()); default: return QVariant(); } return QVariant();}
bool NamesModel::insertRow(int row, const QModelIndex &parent)
{
if ( parent.isValid() )
return false;
qDebug() << "Row = " << row;
beginInsertRows(parent, row, row);
this->namesList.insert(row, ("Hello World " + QString("%1").arg(row)));
endInsertRows();
return true;
}
bool NamesModel::insertRows(int row, int count, const QModelIndex &parent)
{
int existing_count = this->namesList.count();
beginInsertRows(parent, row, count);
for ( int i = existing_count; i < (existing_count + count); i++ )
this->namesList.insert(i, QString("Multi Hello World = %1").arg(i));
endInsertRows();
return true;
}
bool NamesModel::removeRows(int row, int count, const QModelIndex &parent)
{
int existing_count = this->namesList.count();
beginRemoveRows(parent, row, count);
for ( int i = (existing_count + count); i < existing_count; i-- )
this->namesList.removeAt(i);
endRemoveRows();
return true;
}bool NamesModel::removeRow(int row, const QModelIndex &parent)
{
beginRemoveRows(parent, row, row);
this->namesList.removeAt(row);
endRemoveRows();
}void NamesModel::addName()
{
int index = this->namesList.count();
//insertRow(index, QModelIndex());
insertRows(index, 5, QModelIndex());
emit layoutChanged();
emit dataChanged(this->index(index), this->index(this->namesList.count()));
}
void NamesModel::removeName()
{
int index = this->namesList.count();
//removeRow(index, QModelIndex()/this->index(this->namesList.count())/);
removeRows(index, 5, QModelIndex());
emit layoutChanged();
emit dataChanged(this->index(index), this->index(index + 5));
}
@main.qml
@
Rectangle {
width: 360
height: 360
Text {
height: 20
width: 360/2;
text: "Add Name"
MouseArea {
anchors.fill: parent
onClicked: {
names.addName();
console.log("Add Name");
}
}
}
Text {
height: 20;
width: 360/2;
x: 360/2
text: "Remove Name";
MouseArea {
anchors.fill: parent
onClicked: {
names.removeName();
console.log("Remove Name");
}
}
}Component { id: gridDelegate Text { width: 19; // These are the dimensions of icon image. height: 16 font.pixelSize: 12 text: name; } } GridView { y: 21 boundsBehavior: Flickable.StopAtBounds focus: true model: names; delegate: gridDelegate }}
@I am calling beginInsertRows / endInsertRows and beginRemoveRows / endRemoveRows but it does not seems to work. As suggested on other similar threads I have also called layoutChanged / dataChanged after begin / end InserRows but no effect.
Actually I have almost the same problem with my actual project. I have created this application to test whats wrong with this beginInsertRows etc.
Any help is appreciated.
Regards Farrukh Arshad.
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Thanks Andre. Can you please suggest how can I use model tester ?