feat: 添加、删除，预览，保存等功能实现

基本这里就是QStandardItemmodel的实际使用写完了；后面再写，就是在此基础上写代理部分功能

QtQStandardItemModelEx/ExQStandardItemModel.cpp

@@ -2,6 +2,10 @@
 #include "ui_ExQStandardItemModel.h"
 #include <QDebug>
 #include <QFileDialog>
+#include <QFont>
+#include <QTextStream>
+
+#define COLUMN 6  //数据表的列数
 
 ExQStandardItemModel::ExQStandardItemModel(QWidget *parent) :
     QMainWindow(parent),
@@ -22,7 +26,7 @@ ExQStandardItemModel::ExQStandardItemModel(QWidget *parent) :
     ui->statusBar->addWidget(m_labCellPos);
     ui->statusBar->addWidget(m_labCellText);
 
-    m_model = new QStandardItemModel(2, 6, this);                          //设置数据模型，一开始设置为默认的2行6列表的一个表
+    m_model = new QStandardItemModel(2, COLUMN, this);                          //设置数据模型，一开始设置为默认的2行6列表的一个表
     m_selectModet = new QItemSelectionModel(m_model, this);                //设置选择模型
 
     ui->tableView->setModel(m_model);                                      //设置数据模型
@@ -56,7 +60,7 @@ void ExQStandardItemModel::init(QStringList &list)
         QString aLineText = list.at(i);
         tempList = aLineText.split(QRegExp("\\s+"), QString::SkipEmptyParts);//正则表达式中\s匹配任何空白字符，包括空格、制表符、换页符等等, 等价于[ \f\n\r\t\v]
 
-        for ( j = 0; j < 6 - 1; j++) {                                     //设置前5列的item
+        for ( j = 0; j < COLUMN - 1; j++) {                                     //设置前5列的item
             item = new QStandardItem(tempList.at(j));
             m_model->setItem(i - 1, j, item);
         }
@@ -69,23 +73,29 @@ void ExQStandardItemModel::init(QStringList &list)
         else
             item->setCheckState(Qt::Checked);
 
-        m_model->setItem(i - 1, 5, item);
+        m_model->setItem(i - 1, COLUMN -1, item);
     }
 }
 
 //当前单元格发生变化时
 void ExQStandardItemModel::onCurrentChanged(const QModelIndex &current, const QModelIndex &previous)
 {
+    if (current.isValid()) {                                               //当前模型索性有效
+        m_labCellPos->setText(QString("当前单元格：%1行, %2列").arg(current.row()).arg(current.column()));
+        QStandardItem *item = m_model->itemFromIndex(current);             //从模型索引获得Item
+        m_labCellText->setText(QString("当前文件：%1").arg(item->text()));  //显示item的文字内容
 
+        QFont font = item->font();
+        ui->actBold->setChecked(font.bold());                              //更新actFontBold的check状态
+    }
 }
 
-
 //action+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 //打开和导入文件，并且在plainTextEdit里面显示
 void ExQStandardItemModel::on_actOpen_triggered()
 {
     QString currPath = QCoreApplication::applicationDirPath();
-    QString fileName = QFileDialog::getOpenFileName(this, "打开一个文件", currPath, "导入数据文件(*txt); 所有文件(*.*)");
+    QString fileName = QFileDialog::getOpenFileName(this, "打开一个文件", currPath, "导入数据文件(*txt);;所有文件(*.*)");
 
     if (fileName.isEmpty())
         return;
@@ -111,12 +121,197 @@ void ExQStandardItemModel::on_actOpen_triggered()
         ui->actSave->setEnabled(true);
     }
 
-    init(list);                                                        //初始化.txt的数据
+    init(list);                                                            //初始化.txt的数据
 }
 
-
 //在表格的最后一行添加一行
 void ExQStandardItemModel::on_actAppend_triggered()
 {
+    QList<QStandardItem *> list;
+    QStandardItem *item;
 
+    //获取表头前五列
+    for (int i = 0; i < COLUMN - 1; i++) {
+        item = new QStandardItem("添加一行");
+        list<<item;
+    }
+
+    //获取最后一列
+    QString str = m_model->headerData(m_model->columnCount() - 1, Qt::Horizontal, Qt::DisplayRole).toString();
+    item = new QStandardItem(str + "添加一行");
+    item->setCheckable(true);
+    list<<item;
+
+    m_model->insertRow(m_model->rowCount(), list);
+    QModelIndex currIndex = m_model->index(m_model->rowCount() - 1, 0);  //创建最后一行的ModelIndex
+    m_selectModet->clearSelection();
+    m_selectModet->setCurrentIndex(currIndex, QItemSelectionModel::Select);
+}
+
+//保存文件
+void ExQStandardItemModel::on_actSave_triggered()
+{
+    QString path = QCoreApplication::applicationDirPath();
+    QString fileName = QFileDialog::getSaveFileName(this, tr("选择一个文件"), path, "另存数据(*.txt);;所有数据(*.*)");
+    if ( fileName.isEmpty())
+        return;
+
+    QFile file(fileName);
+
+    if (!(file.open(QIODevice::ReadWrite | QIODevice::Text | QIODevice::Truncate))) //读写，文本，覆盖原有内容打开
+        return;
+
+    QTextStream stream(&file);                                            //用文本流读取文件
+    QStandardItem *item;
+    int i = 0 ;
+    int j = 0;
+    QString str = "";
+    ui->plainTextEdit->clear();
+
+    //获取表头文字
+    for (i = 0; i < m_model->columnCount(); i++) {
+        item =  m_model->horizontalHeaderItem(i);
+        str = str + item->text() + "\t\t";                                 //以TAB按键隔开
+    }
+    stream<<str<<"\n";
+    ui->plainTextEdit->appendPlainText(str);
+
+    //获取数据区文字
+    for (i = 1; i < m_model->rowCount(); i++) {
+        str = "";
+
+        for (j = 0; j < m_model->columnCount(); j++) {
+            item = m_model->item(i, j);
+            str = str + item->text() + "\t\t";
+        }
+        stream<<str<<"\n";
+        ui->plainTextEdit->appendPlainText(str);
+    }
+}
+
+//在当前选中的一行，其前面插入一行
+void ExQStandardItemModel::on_actInsert_triggered()
+{
+    QList<QStandardItem *> list;
+    QStandardItem *item;
+
+    for (int i = 0; i < COLUMN - 1; i++) {
+        item = new QStandardItem("插入一行");
+        list<<item;
+    }
+
+    QString str = m_model->headerData(m_model->columnCount() - 1, Qt::Horizontal, Qt::DisplayRole).toString();
+    item = new QStandardItem(str + "插入一行");
+    item->setCheckable(true);
+    list<<item;
+
+    QModelIndex currIndex = m_selectModet->currentIndex();
+    m_model->insertRow(currIndex.row(), list);                 //在当前行的前面插入一行
+    m_selectModet->clearSelection();
+    m_selectModet->setCurrentIndex(currIndex, QItemSelectionModel::Select);
+}
+
+
+//删除一行
+void ExQStandardItemModel::on_actDelete_triggered()
+{
+    QModelIndex currIndex = m_selectModet->currentIndex();
+    m_model->removeRow(currIndex.row());
+}
+
+//关闭退出
+void ExQStandardItemModel::on_actExit_triggered()
+{
+    close();
+}
+
+//预览数据模型:模型数据导出到PlainTextEdit显示
+void ExQStandardItemModel::on_actModelData_triggered()
+{                                          //用文本流读取文件
+    QStandardItem *item;
+    int i = 0 ;
+    int j = 0;
+    QString str = "";
+    ui->plainTextEdit->clear();
+
+    //获取表头文字
+    for (i = 0; i < m_model->columnCount(); i++) {
+        item =  m_model->horizontalHeaderItem(i);
+        str = str + item->text() + "\t\t";                                 //以TAB按键隔开
+    }
+
+    ui->plainTextEdit->appendPlainText(str);
+
+    //获取数据区文字
+    for (i = 1; i < m_model->rowCount(); i++) {
+        str = "";
+
+        for (j = 0; j < m_model->columnCount(); j++) {
+            item = m_model->item(i, j);
+            str = str + item->text() + "\t\t";
+        }
+        ui->plainTextEdit->appendPlainText(str);
+    }
+}
+
+//左对齐
+void ExQStandardItemModel::on_actAlignLeft_triggered()
+{
+    if (!m_selectModet->hasSelection())
+        return;
+
+    QModelIndexList list = m_selectModet->selectedIndexes();     //获得选中的List<item>
+
+    for (int i = 0; i < list.count(); i++) {
+        QModelIndex index = list.at(i);
+        QStandardItem *item = m_model->itemFromIndex(index);
+        item->setTextAlignment(Qt::AlignLeft);                   //设置文本左对齐
+    }
+}
+
+//文本居中
+void ExQStandardItemModel::on_actAlignCenter_triggered()
+{
+    if (!m_selectModet->hasSelection())
+        return;
+
+    QModelIndexList list = m_selectModet->selectedIndexes();     //获得选中的List<item>
+
+    for (int i = 0; i < list.count(); i++) {
+        QModelIndex index = list.at(i);                          //获取一个模型索引
+        QStandardItem *item = m_model->itemFromIndex(index);
+        item->setTextAlignment(Qt::AlignCenter);                 //设置文本居中
+    }
+}
+
+//文本右对齐
+void ExQStandardItemModel::on_actAlingRight_triggered()
+{
+    if (!m_selectModet->hasSelection())
+        return;
+
+    QModelIndexList list = m_selectModet->selectedIndexes();
+
+    for (int i = 0; i < list.count(); i++) {
+        QModelIndex index = list.at(i);
+        QStandardItem *item = m_model->itemFromIndex(index);
+        item->setTextAlignment(Qt::AlignRight);
+    }
+}
+
+//文本加粗
+void ExQStandardItemModel::on_actBold_triggered(bool checked)
+{
+    if (!m_selectModet->hasSelection())
+        return;
+
+    QModelIndexList list = m_selectModet->selectedIndexes();
+
+    for (int i = 0; i < list.count(); i++) {
+        QModelIndex index = list.at(i);
+        QStandardItem *item = m_model->itemFromIndex(index);
+        QFont font = item->font();
+        font.setBold(checked);
+        item->setFont(font);
+    }
 }

QtQStandardItemModelEx/ExQStandardItemModel.h

@@ -19,21 +19,30 @@ public:
     ~ExQStandardItemModel();
 
 private:
-    void init(QStringList& list);          //从list初始化数据模型
+    void init(QStringList& list);           //从list初始化数据模型
 
 private slots:
     void onCurrentChanged(const QModelIndex& current, const QModelIndex& previous);  //当前单元格发生变化时
-    void on_actOpen_triggered();           //打开和导入文件，并且在plainTextEdit里面显示
+    void on_actOpen_triggered();            //打开和导入文件，并且在plainTextEdit里面显示
-    void on_actAppend_triggered();         //在表格的最后一行添加一行
+    void on_actAppend_triggered();          //在表格的最后一行添加一行
+    void on_actSave_triggered();            //保存文件
+    void on_actInsert_triggered();          //在当前选中的一行，其前面插入一行
+    void on_actDelete_triggered();          //删除一行
+    void on_actExit_triggered();            //关闭退出
+    void on_actModelData_triggered();       //预览模型
+    void on_actAlignLeft_triggered();       //左对齐
+    void on_actAlignCenter_triggered();     //文本居中
+    void on_actAlingRight_triggered();      //文本右对齐
+    void on_actBold_triggered(bool checked);//文本加粗
 
 private:
     Ui::ExQStandardItemModel *ui;
 
-    QLabel  *m_labCurrFile;                //当前文件
+    QLabel  *m_labCurrFile;                 //当前文件
-    QLabel *m_labCellPos;                  //当前单元格行列号
+    QLabel *m_labCellPos;                   //当前单元格行列号
-    QLabel *m_labCellText;                 //当前单元格数据内容
+    QLabel *m_labCellText;                  //当前单元格数据内容
-    QStandardItemModel *m_model;           //数据模型
+    QStandardItemModel *m_model;            //数据模型
-    QItemSelectionModel *m_selectModet;    //选择模型
+    QItemSelectionModel *m_selectModet;     //选择模型
 
 };