add trackeditor

TrackEditor/TrackEditor.pro

@@ -0,0 +1,22 @@
+#-------------------------------------------------
+#
+# Project created by QtCreator 2014-11-24T22:57:26
+#
+#-------------------------------------------------
+
+QT       += core gui
+
+greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
+
+TARGET = TrackEditor
+TEMPLATE = app
+
+
+SOURCES += main.cpp\
+        trackeditor.cpp \
+    trackdelegate.cpp
+
+HEADERS  += trackeditor.h \
+    trackdelegate.h
+
+FORMS    += trackeditor.ui

TrackEditor/main.cpp

@@ -0,0 +1,34 @@
+#include "trackeditor.h"
+#include <QApplication>
+
+int main(int argc, char *argv[])
+{
+    QApplication a(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);
+
+    TrackEditor editor(&tracks);
+    editor.resize(600, 300);
+    editor.show();
+
+    return a.exec();
+}

TrackEditor/trackdelegate.cpp

@@ -0,0 +1,84 @@
+
+#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
+{
+    if (index.column() == durationColumn) {
+        int secs = index.model()->data(index, Qt::DisplayRole).toInt();
+        QString text = QString("%1:%2")
+                       .arg(secs / 60, 2, 10, QChar('0'))
+                       .arg(secs % 60, 2, 10, QChar('0'));
+
+        QStyleOptionViewItem myOption = option;
+        myOption.displayAlignment = Qt::AlignRight | Qt::AlignVCenter;
+
+        //重新进行绘制
+        drawDisplay(painter, myOption, myOption.rect, text);
+        drawFocus(painter, myOption, myOption.rect);
+    } else{
+        QItemDelegate::paint(painter, option, index);
+    }
+}
+
+//createEditor用来创建一个编辑器
+QWidget *TrackDelegate::createEditor(QWidget *parent,
+        const QStyleOptionViewItem &option,
+        const QModelIndex &index) const
+{
+    if (index.column() == durationColumn) {
+        QTimeEdit *timeEdit = new QTimeEdit(parent);
+        //设定正确的时间格式
+        timeEdit->setDisplayFormat("mm:ss");
+        //当完成编辑的时候(即按下enter键后--由editingFinished发射信号)，会触发commitAndCloseEditor信号
+        connect(timeEdit, SIGNAL(editingFinished()),
+                this, SLOT(commitAndCloseEditor()));
+        return timeEdit;
+    } else {
+        return QItemDelegate::createEditor(parent, option, index);
+    }
+}
+
+//setEditorData用来初始化编辑器
+void TrackDelegate::setEditorData(QWidget *editor,
+                                  const QModelIndex &index) const
+{
+    if (index.column() == durationColumn) {
+        int secs = index.model()->data(index, Qt::DisplayRole).toInt();
+        QTimeEdit *timeEdit = qobject_cast<QTimeEdit *>(editor);
+        timeEdit->setTime(QTime(0, secs / 60, secs % 60));
+    } else {
+        QItemDelegate::setEditorData(editor, index);
+    }
+}
+
+void TrackDelegate::setModelData(QWidget *editor,
+                                 QAbstractItemModel *model,
+                                 const QModelIndex &index) const
+{
+    if (index.column() == durationColumn) {
+        QTimeEdit *timeEdit = qobject_cast<QTimeEdit *>(editor);
+        QTime time = timeEdit->time();
+        int secs = (time.minute() * 60) + time.second();
+        model->setData(index, secs);
+    } else {
+        QItemDelegate::setModelData(editor, model, index);
+    }
+}
+
+//提交修改并且关闭编辑器
+void TrackDelegate::commitAndCloseEditor()
+{
+    QTimeEdit *editor = qobject_cast<QTimeEdit *>(sender());
+    emit commitData(editor);
+    emit closeEditor(editor);
+}

TrackEditor/trackdelegate.h

@@ -0,0 +1,32 @@
+#ifndef TRACKDELEGATE_H
+#define TRACKDELEGATE_H
+
+#include <QItemDelegate>
+#include <QTimeEdit>
+
+class TrackDelegate : public QItemDelegate
+{
+    Q_OBJECT
+
+public:
+    TrackDelegate(int durationColumn, QObject *parent = 0);
+
+    //我们想要实现分:秒这种格式的时间，所以必须重新编写paint函数
+    void paint(QPainter *painter, const QStyleOptionViewItem &option,
+               const QModelIndex &index) const;
+    //为了实现可编辑的委托，则必须实现以下三个函数：createEditor，setEditorData和setModelData
+    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_H

TrackEditor/trackeditor.cpp

@@ -0,0 +1,76 @@
+#include "trackeditor.h"
+#include "ui_trackeditor.h"
+
+Track::Track(const QString &title, int duration)
+{
+    this->title = title;
+    this->duration = duration;
+}
+
+TrackEditor::TrackEditor(QList<Track> *tracks, QWidget *parent) :
+    QDialog(parent),
+    ui(new Ui::TrackEditor)
+{
+    ui->setupUi(this);
+
+    this->tracks = tracks;
+
+    tableWidget = new QTableWidget(tracks->count(), 2);
+    tableWidget->setItemDelegate(new TrackDelegate(1));
+    tableWidget->setHorizontalHeaderLabels(
+            QStringList() << tr("Track") << tr("Duration"));
+
+    for (int row = 0; row < tracks->count(); ++row) {
+        Track track = tracks->at(row);
+
+        QTableWidgetItem *item0 = new QTableWidgetItem(track.title);
+        tableWidget->setItem(row, 0, item0);
+
+        QTableWidgetItem *item1
+             = new QTableWidgetItem(QString::number(track.duration));
+        item1->setTextAlignment(Qt::AlignRight);
+        tableWidget->setItem(row, 1, item1);
+    }
+
+    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"));
+}
+
+TrackEditor::~TrackEditor()
+{
+    delete ui;
+}
+
+void TrackEditor::done(int result)
+{
+    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()
+{
+    tableWidget->insertRow(tableWidget->rowCount());
+}

TrackEditor/trackeditor.h

@@ -0,0 +1,47 @@
+#ifndef TRACKEDITOR_H
+#define TRACKEDITOR_H
+
+#include <QDialog>
+#include <QDialogButtonBox>
+#include <QTableWidget>
+#include <QList>
+#include <QPushButton>
+#include <QVBoxLayout>
+#include "trackdelegate.h"
+
+namespace Ui {
+class TrackEditor;
+}
+
+class Track
+{
+public:
+    Track(const QString &title = "", int duration = 0);
+
+    QString title;
+    int duration;
+};
+
+class TrackEditor : public QDialog
+{
+    Q_OBJECT
+
+public:
+    explicit TrackEditor(QList<Track> *tracks, QWidget *parent = 0);
+    ~TrackEditor();
+
+    void done(int result);
+
+private slots:
+    void addTrack();
+
+private:
+    QTableWidget *tableWidget;
+    QDialogButtonBox *buttonBox;
+    QList<Track> *tracks;
+
+private:
+    Ui::TrackEditor *ui;
+};
+
+#endif // TRACKEDITOR_H

TrackEditor/trackeditor.ui

@@ -0,0 +1,20 @@
+<ui version="4.0">
+ <class>TrackEditor</class>
+ <widget class="QDialog" name="TrackEditor" >
+  <property name="geometry" >
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>400</width>
+    <height>300</height>
+   </rect>
+  </property>
+  <property name="windowTitle" >
+   <string>TrackEditor</string>
+  </property>
+ </widget>
+ <layoutDefault spacing="6" margin="11" />
+ <pixmapfunction></pixmapfunction>
+ <resources/>
+ <connections/>
+</ui>