Model/View, Delegates for my Data

[kahlenberg]

I added QVariant to the code but the table still displays boolean as ture or false.

QVariant RegisterModel::data(const QModelIndex &index, int role) const
{
...
        case 4:
            return QVariant(Registers[row].wrProtect); // bool
            break;
...
 
    case Qt::CheckStateRole:
 
        if(col == 4)
        {
 
            if(Registers[row].wrProtect == true)
            {
                return QVariant(Qt::Checked);
            }
            else
            {
                return QVariant(Qt::Unchecked);
            }
        }
...
}

QVariant RegisterModel::data(const QModelIndex &index, int role) const
{
...
        case 4:
            return QVariant(Registers[row].wrProtect); // bool
            break;
...

    case Qt::CheckStateRole:

        if(col == 4)
        {

            if(Registers[row].wrProtect == true)
            {
                return QVariant(Qt::Checked);
            }
            else
            {
                return QVariant(Qt::Unchecked);
            }
        }
...
}

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I want to use delegate. When I double-click the cell a new checkbox appers on the left in the cell. Checkbox is not displayed when I don't click.

checkboxdelegate.h

#ifndef CHECKBOXDELEGATE_H
#define CHECKBOXDELEGATE_H
 
#include <QStyledItemDelegate>
#include <QTableView>
#include <QObject>
#include <QDebug>
#include <QCheckBox>
 
#define DEB qDebug().noquote() <<
 
class CheckBoxDelegate : public QStyledItemDelegate
{
    Q_OBJECT
public:
    explicit CheckBoxDelegate(QObject *parent = 0);
    QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const;
    void setEditorData(QWidget *editor, const QModelIndex &index) const;
    void setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const;
    QRect CheckBoxRect(const QStyleOptionViewItem &view_item_style_options) const;
    void updateEditorGeometry(QWidget *editor,
                              const QStyleOptionViewItem &option,
                              const QModelIndex &index) const;
    void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const;
 
    mutable QCheckBox *checkBox;
 
private slots:
    void setData(bool value);
};
 
#endif // CHECKBOXDELEGATE_H

#ifndef CHECKBOXDELEGATE_H
#define CHECKBOXDELEGATE_H

#include <QStyledItemDelegate>
#include <QTableView>
#include <QObject>
#include <QDebug>
#include <QCheckBox>

#define DEB qDebug().noquote() <<

class CheckBoxDelegate : public QStyledItemDelegate
{
    Q_OBJECT
public:
    explicit CheckBoxDelegate(QObject *parent = 0);
    QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const;
    void setEditorData(QWidget *editor, const QModelIndex &index) const;
    void setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const;
    QRect CheckBoxRect(const QStyleOptionViewItem &view_item_style_options) const;
    void updateEditorGeometry(QWidget *editor,
                              const QStyleOptionViewItem &option,
                              const QModelIndex &index) const;
    void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const;

    mutable QCheckBox *checkBox;

private slots:
    void setData(bool value);
};

#endif // CHECKBOXDELEGATE_H

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checkboxdelegate.cpp

#include "checkboxdelegate.h"
#include <QComboBox>
#include <QCheckBox>
#include <QRect>
#include <QPainter>
#include <QSpinBox>
#include <QApplication>
#include <QSignalMapper>
#include "booleanwidget.h"
 
CheckBoxDelegate::CheckBoxDelegate(QObject *parent) :
    QStyledItemDelegate(parent)
{
}
 
 
QWidget* CheckBoxDelegate::createEditor( QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index ) const
{
 
        checkBox = new QCheckBox(parent);
        QObject::connect(checkBox, SIGNAL(toggled(bool)), this, SLOT(setData(bool)));
        return checkBox;
}
 
void CheckBoxDelegate::setEditorData ( QWidget *editor, const QModelIndex &index ) const
{
 
    if(QCheckBox *cb = static_cast<QCheckBox *>(editor)) {
 
        bool checked = index.model()->data(index, Qt::DisplayRole /* Qt::EditRole */).toBool();
        DEB "Checked: " << checked;
        cb->setChecked(checked);
    } 
}
 
void CheckBoxDelegate::setModelData ( QWidget *editor, QAbstractItemModel *model, const QModelIndex &index ) const
{
 
    if(QCheckBox *cb = static_cast<QCheckBox *>(editor))
        // save the current text of the combo box as the current value of the item
        model->setData(index, cb->isChecked());
    else
        QStyledItemDelegate::setModelData(editor, model, index);
}
 
 
void CheckBoxDelegate::updateEditorGeometry(QWidget *editor,
                                          const QStyleOptionViewItem &option,
                                          const QModelIndex &index) const {
 
    editor->setGeometry(option.rect);
}
 
void CheckBoxDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const {
}
 
void CheckBoxDelegate::setData(bool value)
{
    emit commitData(checkBox);
}

#include "checkboxdelegate.h"
#include <QComboBox>
#include <QCheckBox>
#include <QRect>
#include <QPainter>
#include <QSpinBox>
#include <QApplication>
#include <QSignalMapper>
#include "booleanwidget.h"

CheckBoxDelegate::CheckBoxDelegate(QObject *parent) :
    QStyledItemDelegate(parent)
{
}


QWidget* CheckBoxDelegate::createEditor( QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index ) const
{

        checkBox = new QCheckBox(parent);
        QObject::connect(checkBox, SIGNAL(toggled(bool)), this, SLOT(setData(bool)));
        return checkBox;
}

void CheckBoxDelegate::setEditorData ( QWidget *editor, const QModelIndex &index ) const
{

    if(QCheckBox *cb = static_cast<QCheckBox *>(editor)) {

        bool checked = index.model()->data(index, Qt::DisplayRole /* Qt::EditRole */).toBool();
        DEB "Checked: " << checked;
        cb->setChecked(checked);
    } 
}

void CheckBoxDelegate::setModelData ( QWidget *editor, QAbstractItemModel *model, const QModelIndex &index ) const
{

    if(QCheckBox *cb = static_cast<QCheckBox *>(editor))
        // save the current text of the combo box as the current value of the item
        model->setData(index, cb->isChecked());
    else
        QStyledItemDelegate::setModelData(editor, model, index);
}


void CheckBoxDelegate::updateEditorGeometry(QWidget *editor,
                                          const QStyleOptionViewItem &option,
                                          const QModelIndex &index) const {

    editor->setGeometry(option.rect);
}

void CheckBoxDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const {
}

void CheckBoxDelegate::setData(bool value)
{
    emit commitData(checkBox);
}

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What am I missing?

[d_stranz]

I added QVariant to the code but the table still displays boolean as ture or false.

No, I meant return literally "QVariant()" (an empty QVariant instance). Returning QVariant( Qt::Checked ) still results in the table seeing a Boolean value instead of nothing.

Checkbox is not displayed when I don't click.

I think you are misunderstanding what a delegate does. Delegates are -only- used when editing an item in a table or tree view. When the editing is finished, the editor is destroyed and the model is updated. So if you create a checkbox delegate, it will be displayed only when you are actually editing the cell with the Boolean item, otherwise it will not be visible.

If you want something to be visible all of the time, you will have to implement the paint() method to draw the checkbox -image-.

Personally, I think you are chasing this too far. You don't need a delegate for checkboxes, since QTableView already provides one. Did you try my suggestion of connecting a slot to the QItemSelectionModel?