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需求：

做一个简单的产品信息管理界面，能够新增，修改，删除产品信息；（所有数据均保存在内存中）

a.学生信息包括（姓名，学校（金牛小学，青羊小学），班级（1班，2班，3班），年龄，性别，身高，政治面貌，个人描述（不超过300字符）

b.界面左边采用QTreeWidget或相关控件显示学校、班级两级信息；

c.界面右边使用QListWidget或相关控件显示选中班级所有成员信息；

d.新增，修改，删除功能均使用菜单来完成；

程序界面展示：

所用技术：

1、实现自定义委托。

2、QTreewidget、QTableView，

3、MVC模式。

4、菜单栏的功能都可以在对应的控件上右击，弹出快捷菜单。

5、界面布局。

代码：

//main.cpp

<span style="font-size:14px;">#include <QApplication>
#include "widget.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    StuInfoManagementSystem w;
    w.show();

    return a.exec();
}
</span>

//widget.h

<span style="font-size:14px;">#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QStandardItemModel>
#include <QTableView>
#include <QMenu>
#include <QAction>
#include <QMenuBar>
#include <QTreeView>
#include <QTreeWidget>
#include <QStandardItem>
#include "controldelegate.h"

class SpinboxDelegate;
class ComboboxDelegate;

//namespace Ui {
//class StuInfoManagementSystem;
//}

class StuInfoManagementSystem: public QWidget
{
    Q_OBJECT

public:
    explicit StuInfoManagementSystem(QWidget *parent = 0);
    ~StuInfoManagementSystem();

public:
    void contextMenuEvent(QContextMenuEvent *e);
    void menuBarInit(); //菜单初始化
    void tableWidgetInit(); //table控件初始化
    void treeWidgetInit();
    void closeEvent(QCloseEvent *event);//程序关闭时触发
    void upDateTableView();

private:
    QMenu *OperationMenu;  //操作菜单
    QAction *DeleteAction;
    QAction *InsertAction;

    QMenu *helpMenu; //帮助菜单
    QAction *aboutAction;
    QAction *aboutQtAction;

    QMenu *schoolAndGradeMenu;
    QAction *addSchoolAction;
    QAction *addGradeAction;
    QAction *delSchoolOrGradeAction;

    QMenuBar* menuBar;

    SpinboxDelegate* ageSpinbox;//年龄
    SpinboxDelegate* heightSpinbox; //身高
    ComboboxDelegate* schoolCombobox;//学校
    ComboboxDelegate* gradeCombobox;//班级
    ComboboxDelegate* sexCombobox; //性别
    ComboboxDelegate* statusCombobox; //政治面貌

private slots:
    void sltInsertAction();
    void sltDeleteAction();

    void sltAddSchoolAction();
    void sltAddGradeAction();
    void sltDelSchoolOrGradeAction();

    void sltAboutAction();

    void SlotItemClicked(QTreeWidgetItem *item, int column);

private:
    QStandardItemModel* tableModel;
    QTableView* table;
    QStandardItem *dataSources;

    QTreeWidget *treeWidget;

//private:
//    Ui::StuInfoManagementSystem *ui;
};

#endif // WIDGET_H
</span>

//widget.cpp

<span style="font-size:14px;">#include <QSplitter>
#include <QFileSystemModel>
#include <QTreeView>
#include <QListView>
#include <QVBoxLayout>
#include <QAbstractItemModel>
#include <QTableView>
#include <QMenuBar>
#include <QVBoxLayout>
#include <QDebug>
#include <QTreeWidgetItem>
#include <controldelegate.h>
#include <QToolTip>
#include <QAbstractItemView>
#include <QStandardItem>
#include <QList>
#include <QStandardItem>
#include <QMessageBox>
#include <QInputDialog>
#include "widget.h"
#include "ui_widget.h"

StuInfoManagementSystem::StuInfoManagementSystem(QWidget *parent) : QWidget(parent)/*,ui(new Ui::StuInfoManagementSystem)*/
{
    setMinimumSize(1200,400);

    menuBarInit();//菜单初始化
    tableWidgetInit(); //table初始化
    treeWidgetInit(); //tree初始化

    QGridLayout *grid = new QGridLayout;
    grid->addWidget(menuBar,0,0,1,2);
    grid->addWidget(treeWidget,1,0);
    grid->addWidget(table,1,1);
    setLayout(grid);

    showMaximized();
}

StuInfoManagementSystem::~StuInfoManagementSystem()
{
    //delete ui;
}

void StuInfoManagementSystem::contextMenuEvent(QContextMenuEvent *e) //重写上下文事件
{
    //方法一
    if(table->hasFocus())
    {
        OperationMenu->move(cursor().pos());
        OperationMenu->show();
    }
    if(treeWidget->hasFocus())
    {
        schoolAndGradeMenu->move(cursor().pos());
        schoolAndGradeMenu->show();
    }

    //方法二
    //    {
    //        table->addAction(InsertAction);
    //        table->addAction(DeleteAction);
    //        table->setContextMenuPolicy(Qt::ActionsContextMenu);
    //    }
}

void StuInfoManagementSystem::menuBarInit()
{
    menuBar = new QMenuBar(0);
    OperationMenu = new QMenu(QString::fromLocal8Bit("学生"));
    DeleteAction = new QAction(QString::fromLocal8Bit("删除"));
    InsertAction = new QAction(QString::fromLocal8Bit("插入"));
    OperationMenu->addAction(DeleteAction);
    OperationMenu->addAction(InsertAction);

    helpMenu = new QMenu(QString::fromLocal8Bit("帮助"));
    aboutAction = new QAction(QString::fromLocal8Bit("关于软件"));
    aboutQtAction = new QAction(QString::fromLocal8Bit("关于Qt"));
    helpMenu->addAction(aboutAction);
    helpMenu->addAction(aboutQtAction);

    schoolAndGradeMenu = new QMenu(QString::fromLocal8Bit("学校/班级"));
    addSchoolAction = new QAction(QString::fromLocal8Bit("添加 学校"));
    addGradeAction = new QAction(QString::fromLocal8Bit("添加 班级"));
    delSchoolOrGradeAction = new QAction(QString::fromLocal8Bit("删除"));
    schoolAndGradeMenu->addAction(addSchoolAction);
    schoolAndGradeMenu->addAction(addGradeAction);
    schoolAndGradeMenu->addAction(delSchoolOrGradeAction);

    menuBar->addMenu(schoolAndGradeMenu);
    menuBar->addMenu(OperationMenu);
    menuBar->addMenu(helpMenu);


    connect(InsertAction,SIGNAL(triggered(bool)),SLOT(sltInsertAction()));
    connect(DeleteAction,SIGNAL(triggered(bool)),SLOT(sltDeleteAction()));

    connect(addSchoolAction,SIGNAL(triggered(bool)),SLOT(sltAddSchoolAction()));
    connect(addGradeAction,SIGNAL(triggered(bool)),SLOT(sltAddGradeAction()));
    connect(delSchoolOrGradeAction,SIGNAL(triggered(bool)),SLOT(sltDelSchoolOrGradeAction()));

    connect(aboutAction,SIGNAL(triggered(bool)),SLOT(sltAboutAction()));
    connect(aboutQtAction,SIGNAL(triggered(bool)),qApp,SLOT(aboutQt()));

}

void StuInfoManagementSystem::tableWidgetInit()
{
    //tableview初始化
    {
        table  = new QTableView;
        tableModel = new QStandardItemModel;
        table->setModel(tableModel);

        tableModel->setHorizontalHeaderItem(0,new QStandardItem(QString::fromLocal8Bit("姓名")));
        tableModel->setHorizontalHeaderItem(1,new QStandardItem(QString::fromLocal8Bit("学校")));
        tableModel->setHorizontalHeaderItem(2,new QStandardItem(QString::fromLocal8Bit("班级")));
        tableModel->setHorizontalHeaderItem(3,new QStandardItem(QString::fromLocal8Bit("年龄")));
        tableModel->setHorizontalHeaderItem(4,new QStandardItem(QString::fromLocal8Bit("性别")));
        tableModel->setHorizontalHeaderItem(5,new QStandardItem(QString::fromLocal8Bit("身高")));
        tableModel->setHorizontalHeaderItem(6,new QStandardItem(QString::fromLocal8Bit("政治面貌")));
        tableModel->setHorizontalHeaderItem(7,new QStandardItem(QString::fromLocal8Bit("个人描述")));

        // 姓名，学校（金牛小学，青羊小学），班级（1班，2班，3班），年龄，性别，身高，政治面貌，个人描述（不超过300字符）

        table->setModel(tableModel);
        table->horizontalHeader()->setStretchLastSection(true);

        table->setItemDelegateForColumn(1, new ComboboxDelegate);
        table->setItemDelegateForColumn(2,new ComboboxDelegate);
        table->setItemDelegateForColumn(3,new SpinboxDelegate(3));
        table->setItemDelegateForColumn(4,new ComboboxDelegate);
        table->setItemDelegateForColumn(5,new SpinboxDelegate(5));
        table->setItemDelegateForColumn(6,new ComboboxDelegate);

        table->setEditTriggers(QAbstractItemView::DoubleClicked);
        table->setSelectionBehavior(QAbstractItemView::SelectRows);
    }
}

void StuInfoManagementSystem::treeWidgetInit()
{
    treeWidget = new QTreeWidget;
    treeWidget->setMaximumWidth(200);
    treeWidget->setHeaderLabel(QString::fromLocal8Bit("学校/班级"));

    QTreeWidgetItem *qingYang = new  QTreeWidgetItem;
    qingYang->setText(0,QString::fromLocal8Bit("青羊小学"));

    QTreeWidgetItem  *jinNiu = new QTreeWidgetItem;
    jinNiu->setText(0,QString::fromLocal8Bit("金牛小学"));

    QStringList classlist;
    classlist << QString::fromLocal8Bit("1班") << QString::fromLocal8Bit("2班")
              << QString::fromLocal8Bit("3班");
    for(int i=0;i<=2;i++)
    {
        QTreeWidgetItem *tmp_qingYang = new  QTreeWidgetItem(qingYang);
        tmp_qingYang->setText(0,classlist.at(i));
        qingYang->addChild(tmp_qingYang);

        QTreeWidgetItem  *tmp_jinNiu = new QTreeWidgetItem(jinNiu);
        tmp_jinNiu->setText(0,classlist.at(i));
        jinNiu->addChild(tmp_jinNiu);
    }
    treeWidget->insertTopLevelItem(0,qingYang);
    treeWidget->insertTopLevelItem(1,jinNiu);
    connect(treeWidget,SIGNAL(itemPressed(QTreeWidgetItem *, int)),SLOT(SlotItemClicked(QTreeWidgetItem *, int)));
}

void StuInfoManagementSystem::closeEvent(QCloseEvent *event)
{
    qDebug()<<"Application close";
}

void StuInfoManagementSystem::sltInsertAction() //插入行操作
{
    QList<QStandardItem*> item;
    item.append(new QStandardItem(NULL));
    item.append(new QStandardItem(NULL));
    item.append(new QStandardItem(NULL));
    item.append(new QStandardItem(NULL));
    item.append(new QStandardItem(NULL));
    item.append(new QStandardItem(NULL));
    item.append(new QStandardItem(NULL));
    item.append(new QStandardItem(NULL));
    item.at(0)->setTextAlignment(Qt::AlignRight | Qt::AlignVCenter); //设置指定项的对齐方式
    item.at(7)->setTextAlignment(Qt::AlignRight | Qt::AlignVCenter);
    tableModel->insertRow(tableModel->rowCount(),item);
}

void StuInfoManagementSystem::sltDeleteAction() //删除指定行操作
{
    int curreantRow = table->currentIndex().row(); //获取当前行数
    tableModel->removeRow(curreantRow);
}

void StuInfoManagementSystem::sltAddSchoolAction()
{
    bool ok;
    QString text = QInputDialog::getText(this,
                                         "Please Input School Name",
                                         tr("School name:"),
                                         QLineEdit::Normal,
                                         tr(""),
                                         &ok);
    if(ok && !text.isEmpty())
    {
        QTreeWidgetItem *item = new QTreeWidgetItem;
        item->setText(0,text);
        int schoolCount = treeWidget->topLevelItemCount();
        treeWidget->insertTopLevelItem(schoolCount,item);
    }
}

void StuInfoManagementSystem::sltAddGradeAction()
{
    if(treeWidget->currentItem())
    {
        bool ok;
        QString text = QInputDialog::getText(this,
                                             "Please Input Grade Name",
                                             tr("Grade name:"),
                                             QLineEdit::Normal,
                                             tr(""),
                                             &ok);
        if(ok && !text.isEmpty())
        {
            QTreeWidgetItem *item = new QTreeWidgetItem;
            item->setText(0,text);

            if(treeWidget->currentItem()->parent())//当前选中的是班级
            {
                for(int i = 0; i< treeWidget->currentItem()->parent()->childCount(); i++) //同一个学校的班级不能重复
                {
                    if(treeWidget->currentItem()->parent()->child(i)->text(0) == text)
                    {

                        QMessageBox::information(this, QString::fromLocal8Bit("警告"),
                                                 QString::fromLocal8Bit("%1 已经存在").arg(text));
                        return;
                    }
                }
                treeWidget->currentItem()->parent()->addChild(item);
            }
            else
            {
                for(int i = 0; i< treeWidget->currentItem()->childCount(); i++) //同一个学校的班级不能重复
                {
                    if(treeWidget->currentItem()->child(i)->text(0) == text)
                    {

                        QMessageBox::information(this, QString::fromLocal8Bit("警告"),
                                                 QString::fromLocal8Bit("%1 已经存在").arg(text));
                        return;
                    }
                }
                treeWidget->currentItem()->addChild(item);
            }
        }
    }
    treeWidget->expandAll();
}

void StuInfoManagementSystem::sltDelSchoolOrGradeAction()
{
    QTreeWidgetItem *item = treeWidget->currentItem();
    if(!item->parent())
    {
        treeWidget->takeTopLevelItem(treeWidget->indexOfTopLevelItem(treeWidget->currentItem()));
    }
    else
    {
        QTreeWidgetItem *parent = item->parent();
        if(parent)
        {
            parent->removeChild(item);
        }
    }
}

void StuInfoManagementSystem::sltAboutAction()
{
    QMessageBox::about(this, tr("About Aoftware"),tr("Make By Hero"));
}

void StuInfoManagementSystem::SlotItemClicked(QTreeWidgetItem *item, int column)
{
    //学校1，班级2 
    if(item->parent()) //当前item为子项
    {
        for(int row = 0; row <= tableModel->rowCount();row++)
        {
            if(item->text(column) == tableModel->data(tableModel->index(row,2)).toString())  //班级
            {
                if(item->parent()->text(column) ==tableModel->data(tableModel->index(row,1)).toString()) //学校
                    table->setRowHidden(row,false);
                else
                    table->setRowHidden(row,true);
            }
            else
            {
                table->setRowHidden(row,true);
            }
        }
    }
    else //当前点击的item为父项
    {
        if(item->text(column) == QString::fromLocal8Bit("青羊小学"))
        {
            for(int row = 0; row <= tableModel->rowCount();row++)
            {
                if(tableModel->data(tableModel->index(row,1)).toString() != QString::fromLocal8Bit("青羊小学"))
                    table->setRowHidden(row,true);
                else
                    table->setRowHidden(row,false);
            }
        }
        else if(item->text(column) == QString::fromLocal8Bit("金牛小学"))
        {
            for(int row = 0; row <= tableModel->rowCount();row++)
            {

                if(tableModel->data(tableModel->index(row,1)).toString() != QString::fromLocal8Bit("金牛小学"))
                    table->setRowHidden(row,true);
                else
                    table->setRowHidden(row,false);
            }
        }
    }
}
</span>

//controldelegate

<span style="font-size:14px;">#ifndef CONTROLDELEGATE_H
#define CONTROLDELEGATE_H
#include <QItemDelegate>
#include <QObject>

class SpinboxDelegate : public QItemDelegate  //年龄
{
    Q_OBJECT

public:
    SpinboxDelegate(int column);
    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 paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const;
    //void updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const;

private slots:
    void commitAndCloseEditor();

private:
    int mColumn;
};

class ComboboxDelegate : public QItemDelegate  //学校
{
    Q_OBJECT

public:
    ComboboxDelegate();
    QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const;
    void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const;

private slots:
    void commitAndCloseEditor();
};

#endif // CONTROLDELEGATE_H
</span>

//controldelegate.cpp

<span style="font-size:14px;">#include <QSpinBox>
#include <QComboBox>
#include <QDebug>
#include <QApplication>
#include <QStyleOptionViewItem>
#include <QDomDocument>
#include <QFile>
#include <QTextStream>
#include "controldelegate.h"
SpinboxDelegate::SpinboxDelegate(int column)
{
    mColumn = column;
}

//为指定的列或者行创建部件
QWidget *SpinboxDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option,const QModelIndex &index) const
{
    if(index.column() ==3) //年龄
    {
        QSpinBox *editor = new QSpinBox(parent);
        editor->setRange(1,110);
        connect(editor,SIGNAL(editingFinished()),SLOT(commitAndCloseEditor()));
        return editor;
    }
    else if( index.column() == 5) //身高
    {
        QSpinBox *editor = new QSpinBox(parent);
        editor->setRange(120,220);
        connect(editor,SIGNAL(editingFinished()),SLOT(commitAndCloseEditor()));
        return editor;
    }
    else
    {
        return QItemDelegate::createEditor(parent,option,index);
    }
}

//显示格式控制
void SpinboxDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    if(index.column()== 5)
    {
        int age = index.model()->data(index,Qt::DisplayRole).toInt();
        QString text = QString("%1 CM").arg(age,3,10,QChar(' '));

        QStyleOptionViewItem myOption = option;
        myOption.displayAlignment = Qt::AlignRight | Qt::AlignVCenter;

        drawDisplay(painter,myOption,myOption.rect,text);
        drawFocus(painter,myOption,myOption.rect);
    }
    else if(index.column() == 3)
    {
        int height = index.model()->data(index,Qt::DisplayRole).toInt();
        QString text = QString("%1 Year").arg(height,3,10,QChar(' '));

        QStyleOptionViewItem myOption = option;
        myOption.displayAlignment = Qt::AlignRight | Qt::AlignVCenter;

        drawDisplay(painter,myOption,myOption.rect,text);
        drawFocus(painter,myOption,myOption.rect);
    }
}

void SpinboxDelegate::commitAndCloseEditor()
{
    QSpinBox *editor = qobject_cast<QSpinBox*>(sender());
    emit commitData(editor);
    emit closeEditor(editor);
}

//void SpinboxDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const
//{

//}

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);
}

ComboboxDelegate::ComboboxDelegate()
{

}

QWidget *ComboboxDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    QComboBox *editor = new QComboBox(parent);
    if(index.column() == 1)
    {
        editor->addItem(QString::fromLocal8Bit("青羊小学"));
        editor->addItem(QString::fromLocal8Bit("金牛小学"));
        editor->setCurrentIndex(0);

        connect(editor,SIGNAL(editingFinished()),SLOT(commitAndCloseEditor()));
        return editor;
    }
    else if(index.column() == 2)
    {
        editor->addItem(QString::fromLocal8Bit("1班"));
        editor->addItem(QString::fromLocal8Bit("2班"));
        editor->addItem(QString::fromLocal8Bit("3班"));
        editor->setCurrentIndex(0);

        connect(editor,SIGNAL(editingFinished()),SLOT(commitAndCloseEditor()));
        return editor;
    }
    else if(index.column() == 4)
    {
        editor->addItem(QString::fromLocal8Bit("男"));
        editor->addItem(QString::fromLocal8Bit("女"));
        editor->setCurrentIndex(0);

        connect(editor,SIGNAL(editingFinished()),SLOT(commitAndCloseEditor()));
        return editor;
    }
    else if(index.column() == 6)
    {
        editor->addItem(QString::fromLocal8Bit("群众"));
        editor->addItem(QString::fromLocal8Bit("共青团员"));
        editor->addItem(QString::fromLocal8Bit("共产党员"));
        editor->setCurrentIndex(0);

        connect(editor,SIGNAL(editingFinished()),SLOT(commitAndCloseEditor()));
        return editor;
    }
    else
    {
        QItemDelegate::createEditor(parent,option,index);
    }
}

void ComboboxDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    if(index.column() == 1 || index.column() == 2 ||index.column() == 4 ||index.column() == 6)
    {
        QString text = index.model()->data(index , Qt::DisplayRole).toString();

        QStyleOptionViewItem myOption = option;
        myOption.displayAlignment = Qt::AlignRight | Qt::AlignVCenter;

        drawDisplay(painter,myOption,myOption.rect,text);
        drawFocus(painter,myOption,myOption.rect);
    }
    else
    {
        QItemDelegate::paint(painter,option,index);
    }
}

void ComboboxDelegate::commitAndCloseEditor()
{
    QComboBox *editor = qobject_cast<QComboBox*>(sender());
    emit commitData(editor);
    emit closeEditor(editor);
}
</span>