Qt 学习之路2（46）视图和委托---代码实现

代码： #ifndef WIDGET_H#define WIDGET_H#include <qwidget>class QStringListModel;class QListView;namespace Ui {class Widget;}class Widget : public QWidget{ Q_OBJECT public: explicit Widget(QWidget *parent = 0); ~Widget(); private: Ui::Widget *ui; QStringListModel *model; QListView *listView;};#endif // WIDGET_H#ifndef SPINBOXDELEGATE_H#define SPINBOXDELEGATE_H#include <qstyleditemdelegate>#include <qmodelindex>#include <qstyleoptionviewitem>class SpinBoxDelegate : public QStyledItemDelegate{ Q_OBJECTpublic: SpinBoxDelegate(QObject *parent = 0) : QStyledItemDelegate(parent) {} 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#include "widget.h"#include "ui_widget.h"#include <qpushbutton>#include <qhboxlayout>#include <qvboxlayout>#include <qstringlist>#include <qpushbutton>#include <qhboxlayout>#include <qstringlistmodel>#include <qlistview>#include <qdebug>#include "SpinBoxDelegate.h"Widget::Widget(QWidget *parent) : QWidget(parent), ui(new Ui::Widget){ QStringList data1; data1 << "0" << "1" << "2"; model = new QStringListModel(this); model->setStringList(data1); listView = new QListView(this); listView->setModel(model); listView->setItemDelegate(new SpinBoxDelegate(listView)); qDebug() <<listview->selectionModel(); QPushButton *btnShow = new QPushButton(("Show Model"), this); connect(btnShow, SIGNAL(clicked()), this, SLOT(showModel())); QHBoxLayout *buttonLayout = new QHBoxLayout; buttonLayout->addWidget(btnShow); QVBoxLayout *layout = new QVBoxLayout; layout->addWidget(listView); layout->addLayout(buttonLayout); setLayout(layout); ui->setupUi(this);}Widget::~Widget(){ delete ui;}#include "SpinBoxDelegate.h"#include <qspinbox>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);}#include "widget.h"#include <qapplication>int main(int argc, char *argv[]){ QApplication a(argc, argv); Widget w; w.show(); return a.exec();}</qapplication></qspinbox></qspinbox></qspinbox></listview-></qdebug></qlistview></qstringlistmodel></qhboxlayout></qpushbutton></qstringlist></qvboxlayout></qhboxlayout></qpushbutton></qstyleoptionviewitem></qmodelindex></qstyleditemdelegate></qwidget>