Qt—MVC架构

【1】代理应用示例源码

用代码说事，比较靠谱。

代码目录：三个自定义类，重实现QStyledItemDelegate类。main函数应用示例。

（1）ComboDelegate.h

 #ifndef COMBODELEGATE_H
 #define COMBODELEGATE_H

 #include <QStyledItemDelegate>

 class ComboDelegate : public QStyledItemDelegate
 {
 public:
     ComboDelegate(QObject *parent = NULL);

 protected:
     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 // COMBODELEGATE_H

（2）ComboDelegate.cpp

 #include "ComboDelegate.h"
 #include <QComboBox>

 ComboDelegate::ComboDelegate(QObject *parent)
     : QStyledItemDelegate(parent)
 {}

 QWidget *ComboDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const
 {
     Q_UNUSED(option);
     Q_UNUSED(index);

     QStringList list;
     list << "工人" << "农民" << "军人" << "律师";

     QComboBox *pEditor = new QComboBox(parent);
     pEditor->addItems(list);
     pEditor->installEventFilter(const_cast<ComboDelegate*>(this));
     return pEditor;
 }

 void ComboDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const
 {
     QString strText = index.model()->data(index).toString();
     QComboBox *pCombox = NULL;
     pCombox = static_cast<QComboBox*>(editor);
     if (pCombox != NULL)
     {
         int nIndex = pCombox->findText(strText);
         pCombox->setCurrentIndex(nIndex);
     }
 }

 void ComboDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index)const
 {
     QComboBox *pCombox = NULL;
     pCombox = static_cast<QComboBox*>(editor);
     if (pCombox != NULL)
     {
         QString strText = pCombox->currentText();
         model->setData(index, strText);
     }
 }

 void ComboDelegate::updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index)const
 {
     Q_UNUSED(index);
     editor->setGeometry(option.rect);
 }

（3）DateDelegate.h

 #ifndef DATEDELEGATE_H
 #define DATEDELEGATE_H

 #include <QStyledItemDelegate>

 class DateDelegate : public QStyledItemDelegate
 {
 public:
     DateDelegate(QObject *parent = NULL);

 protected:
     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 // DATEDELEGATE_H

（4）DateDelegate.cpp

 #include "DateDelegate.h"
 #include <QDateTimeEdit>

 DateDelegate::DateDelegate(QObject *parent)
     : QStyledItemDelegate(parent)
 {}

 // 首先创建要进行代理的窗体
 QWidget *DateDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const
 {
     Q_UNUSED(option);
     Q_UNUSED(index);

     QDateTimeEdit *pEditor = new QDateTimeEdit(parent);      // 一个日历的控件
     pEditor->setDisplayFormat("yyyy-MM-dd");   // 日期时间的显示格式
     pEditor->setCalendarPopup(true);   // 以下拉的方式显示
     pEditor->installEventFilter(const_cast<DateDelegate*>(this));  // 调用这个函数安装事件过滤器，使这个对象可以捕获QDateTimeEdit对象的事件
     return pEditor;
 }

 // 这个是初始化作用，初始化代理控件的数据
 void DateDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const
 {
   // 先用这个index返回这个model然后用这个model得到index对应的数据
   QString strDate = index.model()->data(index).toString();
   QDate date = QDate::fromString(strDate, Qt::ISODate);     // 根据QString类型得到相应的时间类型
   QDateTimeEdit *pEditor = NULL;
   pEditor = static_cast<QDateTimeEdit*>(editor);    // 强转为QDateTimeEdit*类型
   if (pEditor != NULL)
   {
       pEditor->setDate(date);      // 设置代理控件的显示数据
   }
 }

 // 将代理控件里面的数据更新到视图控件中
 // void setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const;
 void DateDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const
 {
   QDateTimeEdit *pEditor = NULL;
   pEditor = static_cast<QDateTimeEdit*>(editor);    // 得到时间
   if (pEditor != NULL)
   {
       QDate date = pEditor->date();    // 得到时间
       model->setData(index, QVariant(date.toString(Qt::ISODate)));    // 把值放到相应的index里面
   }
 }

 // 代理中数据的改变放到model中
 // void updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const;
 void DateDelegate::updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const
 {
     Q_UNUSED(index);
     editor->setGeometry(option.rect);
 }

（5）SpinDelegate.h

 #ifndef SPINDELEGATE_H
 #define SPINDELEGATE_H

 #include <QStyledItemDelegate>

 class SpinDelegate : public QStyledItemDelegate
 {
 public:
     SpinDelegate(QObject *parent = NULL);

 protected:
     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 // SPINDELEGATE_H

（6）SpinDelegate.cpp

 #include "SpinDelegate.h"

 #include <QSpinBox>

 SpinDelegate::SpinDelegate(QObject *parent)
     : QStyledItemDelegate(parent)
 {
 }

 QWidget *SpinDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const
 {
     Q_UNUSED(option);
     Q_UNUSED(index);

     QSpinBox *pEditor = new QSpinBox(parent);
     pEditor->setRange(, );
     pEditor->installEventFilter(const_cast<SpinDelegate*>(this));
     return pEditor;
 }

 void SpinDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const
 {
     int value = index.model()->data(index).toInt();
     QSpinBox *pSpinbox = NULL;
     pSpinbox = static_cast<QSpinBox*>(editor);
     if (pSpinbox != NULL)
     {
         pSpinbox->setValue(value);
     }
 }

 void SpinDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const
 {
     QSpinBox *pSpinbox = NULL;
     pSpinbox = static_cast<QSpinBox*>(editor);
     if (pSpinbox != NULL)
     {
         int value = pSpinbox->value();
         model->setData(index, value);
     }
 }

 void SpinDelegate::updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const
 {
     Q_UNUSED(index);

     editor->setGeometry(option.rect);
 }

（7）main.cpp

 #include <QApplication>
 #include <QFile>
 #include <QDebug>
 #include <QWidget>
 #include <QTableView>
 #include <QTextStream>
 #include <QStandardItemModel>
 #include "DateDelegate.h"
 #include "ComboDelegate.h"
 #include "SpinDelegate.h"

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

     QStandardItemModel model(, );
     model.setHeaderData(, Qt::Horizontal, QLatin1String("Name"));
     model.setHeaderData(, Qt::Horizontal, QLatin1String("Birthday"));
     model.setHeaderData(, Qt::Horizontal, QLatin1String("Job"));
     model.setHeaderData(, Qt::Horizontal, QLatin1String("Income"));

     QFile file(QLatin1String("/mnt/liuy/info"));
     if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
     {
         qDebug() << "open the file failed...";
         return -;
     }

     QTextStream out(&file);
     QString line;
     model.removeRows(, model.rowCount(QModelIndex()), QModelIndex());
     int row = ;
     do
     {
         line = out.readLine();
         if (!line.isEmpty())
         {
             model.insertRows(row, , QModelIndex());
             QStringList pieces = line.split(",", QString::SkipEmptyParts);
             model.setData(model.index(row, , QModelIndex()), pieces.value());
             model.setData(model.index(row, , QModelIndex()), pieces.value());
             model.setData(model.index(row, , QModelIndex()), pieces.value());
             model.setData(model.index(row, , QModelIndex()), pieces.value());
             ++row;
         }
     } while(!line.isEmpty());
     file.close();

     QTableView tableView;
     tableView.setModel(&model); // 绑定Model
     tableView.setWindowTitle(QLatin1String("Delegate"));

     DateDelegate dateDelegate;
     tableView.setItemDelegateForColumn(, &dateDelegate); // 第一列代理
     ComboDelegate comboDelegate;
     tableView.setItemDelegateForColumn(, &comboDelegate);// 第二列代理
     SpinDelegate spinDelegate;
     tableView.setItemDelegateForColumn(, &spinDelegate); // 第三列代理

     tableView.resize(, ); // 重置大小
     tableView.show();

     return a.exec();
 }

备注：此示例运行环境为UBuntu + Qt5.3.2

【2】读取的信息文件

文件info 内容如下（注意：文件格式）：

Liu,--,工人,
Wang,--,医生,
Sun,--,军人,
Zhang,--,律师,

【3】运行效果图

运行效果图：

第二列编辑图（时间日期控件）：

第三列编辑图（下拉框控件）：

第四列编辑图（微调框控件）：

Good Good Study, Day Day Up.

顺序 选择 循环 总结