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  2 #define COMBODELEGATE_H

#include <QStyledItemDelegate>

class ComboDelegate : public QStyledItemDelegate  7 {  8 public:  9     ComboDelegate(QObject *parent = NULL); 10 
protected: 12     QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const; 13     void setEditorData(QWidget *editor, const QModelIndex &index) const; 14     void setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const; 15     void updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const; 16 }; 17 
#endif // COMBODELEGATE_H

（2）ComboDelegate.cpp

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

ComboDelegate::ComboDelegate(QObject *parent)  5  : QStyledItemDelegate(parent)  6 {}  7 
QWidget *ComboDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const
{ 10  Q_UNUSED(option); 11  Q_UNUSED(index); 12 
 QStringList list; 14     list << "工人" << "农民" << "军人" << "律师"; 15 
    QComboBox *pEditor = new QComboBox(parent); 17     pEditor->addItems(list); 18     pEditor->installEventFilter(const_cast<ComboDelegate*>(this)); 19     return pEditor; 20 } 21 
void ComboDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const
{ 24     QString strText = index.model()->data(index).toString(); 25     QComboBox *pCombox = NULL; 26     pCombox = static_cast<QComboBox*>(editor); 27     if (pCombox != NULL) 28  { 29         int nIndex = pCombox->findText(strText); 30         pCombox->setCurrentIndex(nIndex); 31  } 32 } 33 
void ComboDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index)const
{ 36     QComboBox *pCombox = NULL; 37     pCombox = static_cast<QComboBox*>(editor); 38     if (pCombox != NULL) 39  { 40         QString strText = pCombox->currentText(); 41         model->setData(index, strText); 42  } 43 } 44 
void ComboDelegate::updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index)const
{ 47  Q_UNUSED(index); 48     editor->setGeometry(option.rect); 49 }

（3）DateDelegate.h

#ifndef DATEDELEGATE_H  2 #define DATEDELEGATE_H

#include <QStyledItemDelegate>

class DateDelegate : public QStyledItemDelegate  7 {  8 public:  9     DateDelegate(QObject *parent = NULL); 10 
protected: 12     QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const; 13     void setEditorData(QWidget *editor, const QModelIndex &index) const; 14     void setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const; 15     void updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const; 16 }; 17 
#endif // DATEDELEGATE_H

（4）DateDelegate.cpp

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

DateDelegate::DateDelegate(QObject *parent)  5  : QStyledItemDelegate(parent)  6 {}  7 
// 首先创建要进行代理的窗体
QWidget *DateDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const
{ 11  Q_UNUSED(option); 12  Q_UNUSED(index); 13 
    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; 19 } 20 
// 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
{ 24   // 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(); 26   QDate date = QDate::fromString(strDate, Qt::ISODate);     // 根据QString类型得到相应的时间类型
  QDateTimeEdit *pEditor = NULL; 28   pEditor = static_cast<QDateTimeEdit*>(editor);    // 强转为QDateTimeEdit*类型
  if (pEditor != NULL) 30  { 31       pEditor->setDate(date);      // 设置代理控件的显示数据
 } 33 } 34 
// 将代理控件里面的数据更新到视图控件中 36 // void setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const;
void DateDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const
{ 39   QDateTimeEdit *pEditor = NULL; 40   pEditor = static_cast<QDateTimeEdit*>(editor);    // 得到时间
  if (pEditor != NULL) 42  { 43       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
 } 46 } 47 
// 代理中数据的改变放到model中 49 // void updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const;
void DateDelegate::updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const
{ 52  Q_UNUSED(index); 53     editor->setGeometry(option.rect); 54 }

（5）SpinDelegate.h

#ifndef SPINDELEGATE_H  2 #define SPINDELEGATE_H

#include <QStyledItemDelegate>

class SpinDelegate : public QStyledItemDelegate  7 {  8 public:  9     SpinDelegate(QObject *parent = NULL); 10 
protected: 12     QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const; 13     void setEditorData(QWidget *editor, const QModelIndex &index) const; 14     void setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const; 15     void updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const; 16 }; 17 
#endif // SPINDELEGATE_H

（6）SpinDelegate.cpp

#include "SpinDelegate.h"

#include <QSpinBox>

SpinDelegate::SpinDelegate(QObject *parent)  6  : QStyledItemDelegate(parent)  7 {  8 }  9 
QWidget *SpinDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const
{ 12  Q_UNUSED(option); 13  Q_UNUSED(index); 14 
    QSpinBox *pEditor = new QSpinBox(parent); 16     pEditor->setRange(0, 30000); 17     pEditor->installEventFilter(const_cast<SpinDelegate*>(this)); 18     return pEditor; 19 } 20 
void SpinDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const
{ 23     int value = index.model()->data(index).toInt(); 24     QSpinBox *pSpinbox = NULL; 25     pSpinbox = static_cast<QSpinBox*>(editor); 26     if (pSpinbox != NULL) 27  { 28         pSpinbox->setValue(value); 29  } 30 } 31 
void SpinDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const
{ 34     QSpinBox *pSpinbox = NULL; 35     pSpinbox = static_cast<QSpinBox*>(editor); 36     if (pSpinbox != NULL) 37  { 38         int value = pSpinbox->value(); 39         model->setData(index, value); 40  } 41 } 42 
void SpinDelegate::updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const
{ 45  Q_UNUSED(index); 46 
    editor->setGeometry(option.rect); 48 }

（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[]) 13 { 14  QApplication a(argc, argv); 15 
    QStandardItemModel model(4, 4); 17     model.setHeaderData(0, Qt::Horizontal, QLatin1String("Name")); 18     model.setHeaderData(1, Qt::Horizontal, QLatin1String("Birthday")); 19     model.setHeaderData(2, Qt::Horizontal, QLatin1String("Job")); 20     model.setHeaderData(3, Qt::Horizontal, QLatin1String("Income")); 21 
    QFile file(QLatin1String("/mnt/liuy/info")); 23     if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) 24  { 25         qDebug() << "open the file failed..."; 26         return -1; 27  } 28 
    QTextStream out(&file); 30  QString line; 31     model.removeRows(0, model.rowCount(QModelIndex()), QModelIndex()); 32     int row = 0; 33     do
 { 35         line = out.readLine(); 36         if (!line.isEmpty()) 37  { 38             model.insertRows(row, 1, QModelIndex()); 39             QStringList pieces = line.split(",", QString::SkipEmptyParts); 40             model.setData(model.index(row, 0, QModelIndex()), pieces.value(0)); 41             model.setData(model.index(row, 1, QModelIndex()), pieces.value(1)); 42             model.setData(model.index(row, 2, QModelIndex()), pieces.value(2)); 43             model.setData(model.index(row, 3, QModelIndex()), pieces.value(3)); 44             ++row; 45  } 46     } while(!line.isEmpty()); 47  file.close(); 48 
 QTableView tableView; 50     tableView.setModel(&model); // 绑定Model
    tableView.setWindowTitle(QLatin1String("Delegate")); 52 
 DateDelegate dateDelegate; 54     tableView.setItemDelegateForColumn(1, &dateDelegate); // 第一列代理
 ComboDelegate comboDelegate; 56     tableView.setItemDelegateForColumn(2, &comboDelegate);// 第二列代理
 SpinDelegate spinDelegate; 58     tableView.setItemDelegateForColumn(3, &spinDelegate); // 第三列代理

    tableView.resize(500, 300); // 重置大小
 tableView.show(); 62 
    return a.exec(); 64 }

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,1977-01-05,工人,1500
Wang,1987-11-25,医生,2500
Sun,1967-10-05,军人,500
Zhang,1978-01-12,律师,4500

 

【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