基于QItemDelegate的例子2 trackeEditorDelegate

?trackeEditorDelegate例子是《#include <QApplication>#include "trackeditor.h"int main(int argc, char *argv[]){ QApplication app(argc, argv); QList<Track> tracks; tracks << Track("The Flying Dutchman: Overture", 630) << Track("The Flying Dutchman: Wie aus der Fern laengst " "vergangner Zeiten", 374) << Track("The Flying Dutchman: Steuermann, lass die Wacht", 152) << Track("Die Walkuere: Ride of the Valkyries", 286) << Track("Tannhaeuser: Freudig begruessen wir die edle " "Halle", 384) << Track("Tannhaeuser: Wie Todesahnung - O du mein holder " "Abendstern", 257) << Track("Lohengrin: Treulich gefuert ziehet dahnin", 294) << Track("Lohengrin: In fernem Land", 383) << Track("Die Meistersinger von Nuernberg: Overture", 543) << Track("Die Meistersinger von Nuernberg: Verachtet mir " "die Meister nicht", 200) << Track("Die Meistersinger von Nuernberg: Ehrt eure " "deutschen Meister", 112) << Track("Goetterdaemmerung: Funeral Music", 469) << Track("Tristan und Isolde: Mild und leise, wie er " "laechelt", 375); //自定义编辑控件 TrackEditor editor(&tracks); editor.resize(600, 300); editor.show(); return app.exec();}

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?TrackEditor.h

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#ifndef TRACKEDITOR_H#define TRACKEDITOR_H#include <QDialog>#include <QList>class QDialogButtonBox;class QTableWidget;class Track{public:    Track(const QString &title = "", int duration = 0);    QString title;    int duration;};class TrackEditor : public QDialog{    Q_OBJECTpublic:    TrackEditor(QList<Track> *tracks, QWidget *parent = 0);    void done(int result);private slots:    void addTrack();private:    QTableWidget *tableWidget;    QDialogButtonBox *buttonBox;    QList<Track> *tracks;};#endif

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TrackEditor.cpp

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#include <QtGui>#include "trackdelegate.h"#include "trackeditor.h"Track::Track(const QString &title, int duration){    this->title = title;    this->duration = duration;}TrackEditor::TrackEditor(QList<Track> *tracks, QWidget *parent)    : QDialog(parent){    this->tracks = tracks;    //视图控件    tableWidget = new QTableWidget(tracks->count(), 2);    //设置委托    tableWidget->setItemDelegate(new TrackDelegate(1));    //设置视图列头    tableWidget->setHorizontalHeaderLabels(            QStringList() << tr("Track") << tr("Duration"));    //初始化视图内容    for (int row = 0; row < tracks->count(); ++row) {        Track track = tracks->at(row);        QTableWidgetItem *item0 = new QTableWidgetItem(track.title);        //设置第0列中所有项        tableWidget->setItem(row, 0, item0);        QTableWidgetItem *item1             = new QTableWidgetItem(QString::number(track.duration));        item1->setTextAlignment(Qt::AlignRight);        //设置第1列所有项        tableWidget->setItem(row, 1, item1);    }    //根据委托的SizeHint，重新设置视图大小    tableWidget->resizeColumnToContents(0);    buttonBox = new QDialogButtonBox(QDialogButtonBox::Ok                                     | QDialogButtonBox::Cancel);    QPushButton *addTrackButton = buttonBox->addButton(tr("&Add Track"),            QDialogButtonBox::ActionRole);    connect(addTrackButton, SIGNAL(clicked()), this, SLOT(addTrack()));    connect(buttonBox, SIGNAL(accepted()), this, SLOT(accept()));    connect(buttonBox, SIGNAL(rejected()), this, SLOT(reject()));    QVBoxLayout *mainLayout = new QVBoxLayout;    mainLayout->addWidget(tableWidget);    mainLayout->addWidget(buttonBox);    setLayout(mainLayout);    setWindowTitle(tr("Track Editor"));}void TrackEditor::done(int result){    //ok    if (result == QDialog::Accepted) {        tracks->clear();        for (int row = 0; row < tableWidget->rowCount(); ++row) {            QString title = tableWidget->item(row, 0)->text();            QTableWidgetItem *item = tableWidget->item(row, 1);            int duration = item ? item->text().toInt() : 0;            tracks->append(Track(title, duration));        }    }    QDialog::done(result);}void TrackEditor::addTrack(){    //在最后新插入一行    tableWidget->insertRow(tableWidget->rowCount());}

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TrackDelegate.h

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#ifndef TRACKDELEGATE_H#define TRACKDELEGATE_H#include <QItemDelegate>class TrackDelegate : public QItemDelegate{    Q_OBJECTpublic:    TrackDelegate(int durationColumn, QObject *parent = 0);    //重新绘制    void paint(QPainter *painter, const QStyleOptionViewItem &option,               const QModelIndex &index) const;    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;private slots:    void commitAndCloseEditor();private:    int durationColumn;};#endif

?TrackDelegate.cpp

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#include <QtGui>#include "trackdelegate.h"TrackDelegate::TrackDelegate(int durationColumn, QObject *parent)    : QItemDelegate(parent){    this->durationColumn = durationColumn;}void TrackDelegate::paint(QPainter *painter,                          const QStyleOptionViewItem &option,                          const QModelIndex &index) const{    //保存音轨的列    if (index.column() == durationColumn) {        //获得索引对应Model中的数据        int secs = index.model()->data(index, Qt::DisplayRole).toInt();        //设置时间格式字符串 分:秒        QString text = QString("%1:%2")                       .arg(secs / 60, 2, 10, QChar('0'))                       .arg(secs % 60, 2, 10, QChar('0'));        //获取项风格设置        QStyleOptionViewItem myOption = option;        myOption.displayAlignment = Qt::AlignRight | Qt::AlignVCenter;        //绘制文本        drawDisplay(painter, myOption, myOption.rect, text);        //如果当前有焦点，就绘制一个焦点矩形，否则什么都不做        drawFocus(painter, myOption, myOption.rect);    } else{        //否则默认        QItemDelegate::paint(painter, option, index);    }}QWidget *TrackDelegate::createEditor(QWidget *parent,        const QStyleOptionViewItem &option,        const QModelIndex &index) const{    //音轨时间列    if (index.column() == durationColumn) {        //时间编辑控件        QTimeEdit *timeEdit = new QTimeEdit(parent);        //时间编辑控件文本格式        timeEdit->setDisplayFormat("mm:ss");        //如果编辑结束，激活提交和关闭槽        connect(timeEdit, SIGNAL(editingFinished()),                this, SLOT(commitAndCloseEditor()));        return timeEdit;    } else {        //否则使用默认委托处理        return QItemDelegate::createEditor(parent, option, index);    }}//设置控件值void TrackDelegate::setEditorData(QWidget *editor,                                  const QModelIndex &index) const{    //音轨时间列    if (index.column() == durationColumn) {        //获得当前索引在Model中的值        int secs = index.model()->data(index, Qt::DisplayRole).toInt();        //设置时间控件的值        QTimeEdit *timeEdit = qobject_cast<QTimeEdit *>(editor);        timeEdit->setTime(QTime(0, secs / 60, secs % 60));    } else {        QItemDelegate::setEditorData(editor, index);    }}//设置Model值void TrackDelegate::setModelData(QWidget *editor,                                 QAbstractItemModel *model,                                 const QModelIndex &index) const{    //音轨列    if (index.column() == durationColumn) {        //获得时间控件值        QTimeEdit *timeEdit = qobject_cast<QTimeEdit *>(editor);        QTime time = timeEdit->time();        int secs = (time.minute() * 60) + time.second();        //设置模型值        model->setData(index, secs);    } else {        //否则使用默认委托处理        QItemDelegate::setModelData(editor, model, index);    }}//自定义 提交和关闭 槽函数void TrackDelegate::commitAndCloseEditor(){    QTimeEdit *editor = qobject_cast<QTimeEdit *>(sender());    //提交该控件的值 否则模型中数据不更改    emit commitData(editor);    //关闭该控件 可以告知委托去代开下一个控件    emit closeEditor(editor);}