QStyledItemDelegate派生类小例

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QStyledItemDelegate派生类小例

///spinboxdelegate.h/

#ifndef SPINBOXDELEGATE_H

#define SPINBOXDELEGATE_H

#include <QWidget>

#include <QStyledItemDelegate>

#include <QModelIndex>

#include <QObject>

#include <QSize>

#include <QSpinBox>

class SpinBoxDelegate : public QStyledItemDelegate

{

    Q_OBJECT

public:

    SpinBoxDelegate(QObject *parent = 0);

    ~SpinBoxDelegate();

    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;

    void updateEditorGeometry(QWidget *editor,const QStyleOptionViewItem *option,

                              const QModelIndex &index) const;

};

#endif // SPINBOXDELEGATE_H

/spinboxdelegate.cpp///

#include "spinboxdelegate.h"

SpinBoxDelegate::SpinBoxDelegate(QObject *parent)

    : QStyledItemDelegate(parent)

{

}

SpinBoxDelegate::~SpinBoxDelegate()

{

}

QWidget *SpinBoxDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option,

                                       const QModelIndex &index) const{

    QSpinBox *editor = new QSpinBox(parent);

    editor->setMinimum(0);

    editor->setMaximum(100);

    return editor;

}

void SpinBoxDelegate::setEditorData(QWidget *editor,

                                    const QModelIndex &index) const{

    int value = index.model()->data(index,Qt::EditRole).toInt();

    QSpinBox *spinBox = static_cast<QSpinBox*>(editor);

    spinBox->setValue(value);

}

void SpinBoxDelegate::setModelData(QWidget *editor, QAbstractItemModel *model,

                                   const QModelIndex &index) const{

    QSpinBox *spinBox = static_cast<QSpinBox*>(editor);

    spinBox->interpretText();

    int value = spinBox->value();

    model->setData(index, value, Qt::EditRole);

}

void SpinBoxDelegate::updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem *option,

                                           const QModelIndex &index) const{

    editor->setGeometry(option->rect);

}

/main.cpp///

#include "spinboxdelegate.h"

#include <QApplication>

#include <QStandardItemModel>

#include <QTableView>

#include <QModelIndex>

int main(int argc, char *argv[])

{

    QApplication a(argc, argv);

    QStandardItemModel model(4,2);

    QTableView tableView;

    tableView.setModel(&model); //为视图设置模型

    SpinBoxDelegate spinBox_dg;

    tableView.setItemDelegate(&spinBox_dg); //为视图设置项委托

    for(int row = 0; row < 4; ++row){

        for(int column = 0; column < 2; ++column){

            QModelIndex index = model.index(row,column,QModelIndex());

            model.setData( index,QVariant((row + 1) * (column + 1)) );

        }

    }

    tableView.setWindowTitle(QObject::tr("Spin Box Delegate"));

    tableView.show();

    return a.exec();

}

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