Filtered model does not work inside a delegate

[Wowalive]

Hi guys,

I have a problem with an filtered model inside a delegate. I want to display the entries from a database, sorted by date. The data behind the database could be any kind of QAbstractItemModel.

As an example I have written a simple todo list based on database entries. Here I want to display the corresponding todos next to the respective date.

From the log output of the Repeater I can see, that some entries are available. But they are not displayed in the grid..

    ColumnLayout {
        anchors.fill: parent
        DayOfWeekRow {
            locale: grid.locale
            Layout.fillWidth: true
        }

        MonthGrid {
            id: grid
            month: nowDate.getMonth()
            year: 2019
            locale: Qt.locale("de_DE")
            Layout.fillWidth: true
            Layout.fillHeight: true

            contentItem: Grid {
                rows: 5
                columns: 7
                rowSpacing: grid.spacing
                columnSpacing: grid.spacing

                Repeater {
                    model: grid.source
                    delegate: grid.delegate
                }
            }

            delegate: RowLayout{
                id: delegate
                property var delegDate: model.date.toLocaleString(Qt.locale("de_DE"),"yyyy-MM-dd");

                Component.onCompleted: {
                    todoModel.setDateFilter(delegDate)
                }

                Rectangle {
                    visible: model.month === grid.month
                    Layout.preferredHeight: 40
                    Layout.preferredWidth: 40
                    radius: height/2
                    color: "#ccc"

                    Text {
                        anchors.centerIn: parent
                        text: model.day + "." + (model.month+1)
                        font.bold: model.today
                    }
                }
                ColumnLayout {
                    visible: model.month === grid.month
                    Repeater{
                        model: todoModel

                        Component.onCompleted: {
                            if(model.rowCount() > 0)
                                console.log("Entries available on " + delegate.delegDate)
                        }

                        Text {
                            text: todo
                        }
                    }
                }
            }
        }
    }

For every day in the CalendarModel (delegate) I put a dateFilter on my todoModel. But the Repeater does not show the filtered entries..

void TodoModel::setDateFilter(QString date)
{
    if (m_dateFilter == date)
        return;

    m_dateFilter = date;
    updateModel();
}

void TodoModel::updateModel()
{
    // The update is performed SQL-queries to the database
    if(m_dateFilter.isEmpty()) {
        this->setQuery("SELECT * FROM " TABLE_DAILYTODOS);
    } else {
        this->setQuery("SELECT * FROM " TABLE_DAILYTODOS " WHERE " COLUMN_DATE "='" +m_dateFilter+ "'");
    }
}

I hope you can help me to achieve my project.

[0_1560326438682_RepeaterListview.zip](Uploading 100%)

PS: How can I share the example project with you? I dont't have the privileges to upload it here..

[Wowalive]

Does no one has similar problems?

[Pradeep P N]

Hi @Wowalive
Can you re-upload the image ?

Hoping the below information could help you.

In your TodoModel ( Expecting it is inherited from QSortFilterProxyModel )

• Have you tried filterAcceptsColumn or filterAcceptsRow.
• Also setSourceModel if you have different source model.
• invalidateFilter() function should be called if you are implementing custom filtering.

Example:

• TodoModel.h

    Q_PROPERTY(Filter filter READ filter WRITE setFilter NOTIFY filterChanged)

public:
    enum Filter {
        ShowFirstRow = Qt::UserRole + 1,
        HideFirstRow,
    };

    Q_ENUM(Filter)

    Filter filter();
    void setFilter(Filter filter);

    bool filterAcceptsColumn(int source_row, const QModelIndex &source_parent) const override;
 // or      // As per requirment
    bool filterAcceptsRow(int source_row, const QModelIndex &source_parent) const override;

//  if you have different source model
    void setSourceModel(QAbstractItemModel *sourceModel) override; 

• TodoModel.cpp

TodoModel::Filter TodoModel::filter()
{
    return m_filter;
}

void TodoModel::setFilter(TodoModel::Filter filter)
{
    if (filter == m_filter)
        return;
    m_filter = filter;
    emit filterChanged();

    this->invalidateFilter();
}

• At QML something like below

    ListView {
        id: testView

        model: TodoModel {
            sourceModel: // Provide the Source model
            filter: // provide the Filter
        }

        delegate: MyDeligate { }
    }

All the best.