基于QItemDelegate的例子2 trackeEditorDelegate

trackeEditorDelegate例子是《 C++ GUI Programming with Qt 4》中自定义委托的标准例子。

和上一个SpinBox例子相比更完整：它多了自定义Editor、重载Paint()函数、提交数据信号commitData()、关闭控件信号closeEditor()

附件中有源码可以下载。

Main.cpp

#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();
}

TrackEditor.h

#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

TrackEditor.cpp

#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)
{//okif (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());
}

TrackDelegate.h

#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

#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);
}

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