代码实现制作QT表格

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一、简介

 QTableWidget是QT对话框设计中常用的显示数据表格的控件，QTableWidget单元格数据是QTableWidgetItem对象来实现的，整个表格都需要用逐个单元格对象QTableWidgetItem构建起来。

二、详解

1、代码

（1）table.h

1. #ifndef TABLE_H  
   #define TABLE_H  
   #include <QtGui>  
     
   class Table : public QTableWidget  
   {  
       Q_OBJECT  
   public:  
       Table(QWidget *parent = 0);  
       ~Table();  
       void setColumnValue(const int &columnSum, const QStringList &header);   //set header value  
       void setHeaderWidth(const int &index, const int &width);    //set header and column widhth for each index  
       void setHeaderHeight(const int &height);                    //set header height  
     
       void addRowValue(const int &height, const QStringList &value, const QIcon &fileIcon);  
       void setRowH(const int &index, const int &height);  
       void setItemFixed(bool flag);  
       bool getSelectedRow(QList<int> &rowList);  
         
   protected:  
       void contextMenuEvent(QContextMenuEvent *event);  
       QModelIndex moveCursor(CursorAction cursorAction, Qt::KeyboardModifiers modifiers);  
       void keyPressEvent(QKeyEvent *event);  
     
   private:  
       void createActions();  
         
   private slots:  
       void slotItemEntered(QTableWidgetItem *item);  
       void slotActionRename();  
       void slotItemSelectionChanged();  
         
   private:  
       int tableWidth;  
       int tableHeight;  
       QList<int>rowHeghtList;  
       QList<int>rowWidthList;  
         
       QMenu *popMenu;  
       QAction *actionName;  
       QAction *actionSize;  
       QAction *actionType;  
       QAction *actionDate;  
       QAction *actionOpen;  
       QAction *actionDownload;  
       QAction *actionFlush;  
       QAction *actionDelete;  
       QAction *actionRename;  
       QAction *actionCreateFolder;  
       QTableWidgetItem *rightClickedItem;  
       QMap<QTableWidgetItem *, QString>fileMap;  
       bool dupFlag;  
   };  
     
   // custom item delegate class  
   class NoFocusDelegate : public QStyledItemDelegate  
   {  
   protected:  
       void paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const;  
   };  
   #endif // TABLE_H

（2）table.cpp

1. #include "table.h"  
     
   Table::Table(QWidget *parent)  
       : QTableWidget(parent)  
       , rightClickedItem(NULL)  
       , dupFlag(false)  
   {  
       rowHeghtList.clear();  
       rowWidthList.clear();  
       fileMap.clear();  
       this->setMouseTracking(true);  
       //setWindowTitle(tr("table"));  
       horizontalHeader()->setDefaultSectionSize(100);  
       verticalHeader()->setDefaultSectionSize(30);    //设置默认行高  
       tableWidth = 100;  
       tableHeight = 30;  
       horizontalHeader()->setClickable(false);    //设置表头不可点击（默认点击后进行排序  
     
       QFont font = horizontalHeader()->font();    //设置表头字体加粗  
       font.setBold(true);  
       horizontalHeader()->setFont(font);  
       horizontalHeader()->setStretchLastSection(true);    //设置充满表宽度  
       horizontalHeader()->setMovable(false);              //表头左右互换  
       //verticalHeader()->setResizeMode(QHeaderView::ResizeToContents);  
     
       setFrameShape(QFrame::NoFrame);      //设置无边框  
       //setShowGrid(false);                //设置不显示格子线  
       verticalHeader()->setVisible(false); //设置垂直头不可见  
       setSelectionMode(QAbstractItemView::ExtendedSelection);  //可多选（Ctrl、Shift、  Ctrl+A都可以）  
       setSelectionBehavior(QAbstractItemView::SelectRows);  //设置选择行为时每次选择一行  
       setEditTriggers(QAbstractItemView::NoEditTriggers); //设置不可编辑  
     
       setStyleSheet("selection-background-color:lightblue;");  //设置选中背景色  
       //horizontalHeader()->setStyleSheet("QHeaderView::section{background:skyblue;}"); //设置表头背景色  
       //setStyleSheet("background: rgb(56,56,56);alternate-background-color:rgb(48,51,55);selection-background-color:qlineargradient(x1:0, y1:0, x2:0, y2:1, stop:0 rgb(56,56,56),stop:1 rgb(76,76,76));"); //设置选中背景色  
       horizontalHeader()->setStyleSheet("QHeaderView::section{background-color: qlineargradient(x1:0, y1:0, x2:0, y2:1, stop:0 rgba(134, 245, 99, 255),stop:0.5 rgba(134, 148, 99, 255),stop:1 rgba(115, 87, 128, 255));color:rgb(25, 70, 100);padding-left: 1px;border: 1px solid #FFFF00;}"); //设置表头背景色  
       setAlternatingRowColors(true);  
     
       //setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);  
       //setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);  
       //设置水平、垂直滚动条样式  
       horizontalScrollBar()->setStyleSheet("QScrollBar{background:transparent; height:12px;}"  
                                            "QScrollBar::handle{background:lightgray; border:2px solid transparent; border-radius:5px;}"  
                                            "QScrollBar::handle:hover{background:gray;}"  
                                            "QScrollBar::sub-line{background:transparent;}"  
                                            "QScrollBar::add-line{background:transparent;}");  
     
       verticalScrollBar()->setStyleSheet("QScrollBar{background:transparent; width:12px;}"  
                                          "QScrollBar::handle{background:lightgray; border:2px solid transparent; border-radius:5px;}"  
                                          "QScrollBar::handle:hover{background:gray;}"  
                                          "QScrollBar::sub-line{background:transparent;}"  
                                          "QScrollBar::add-line{background:transparent;}");  
     
       // set the item delegate to your table widget  
       setItemDelegate(new NoFocusDelegate());             //虚线边框去除  
       //setFocusPolicy(Qt::NoFocus);   //去除选中虚线框  
       horizontalHeader()->setHighlightSections(false);    //点击表时不对表头行光亮（获取焦点）  
     
       createActions();  
       setItemFixed(false);  
       connect(this, SIGNAL(itemEntered(QTableWidgetItem*)), this , SLOT(slotItemEntered(QTableWidgetItem*)));  
       connect(this, SIGNAL(itemSelectionChanged()), this , SLOT(slotItemSelectionChanged()));  
       //this->resize(600, 600);  
   }  
     
   Table::~Table()  
   {  
     
   }  
     
   void Table::setColumnValue(const int &columnSum, const QStringList &header)  
   {  
       setColumnCount(columnSum);                //设置列数  
       this->setHorizontalHeaderLabels(header);  //设置列的标签  
   }  
     
   void Table::setHeaderWidth(const int &index, const int &width)  
   {  
       horizontalHeader()->resizeSection(index,width);  
       if (rowWidthList.count() <= index + 1) {  
         rowWidthList.append(width);  
       }  
       else {  
         rowWidthList[index+1] = width;  
       }  
       tableWidth = 0;  
       for(int index = 0; index < rowWidthList.count(); index++)  
          tableWidth += rowWidthList.at(index);  
       resize(tableWidth, tableHeight);  
   }  
     
   void Table::setHeaderHeight(const int &height)  
   {  
       horizontalHeader()->setFixedHeight(height);        //设置表头的高度  
       if (rowHeghtList.isEmpty()) {  
         rowHeghtList.append(height);  
       }  
       else {  
         rowHeghtList[0] = height;  
       }  
       tableHeight = 0;  
       for(int index = 0; index < rowHeghtList.count(); index++)  
          tableHeight += rowHeghtList.at(index);  
       resize(tableWidth, tableHeight);  
   }  
     
   void Table::addRowValue(const int &height, const QStringList &value, const QIcon &fileIcon)  
   {  
       int row_count = rowCount();    //获取表单行数  
       insertRow(row_count);          //插入新行  
       setRowHeight(row_count, height);  
       for (int index = 0; index < columnCount(); index++) {  
           QTableWidgetItem *item = new QTableWidgetItem;  
           if (index == 0) {  
               item->setIcon(fileIcon);  
               item->setTextAlignment(Qt::AlignVCenter | Qt::AlignLeft);  
               fileMap.insert(item, value.at(index));  
           }  
           else {  
               item->setTextAlignment(Qt::AlignCenter);  
           }  
           item->setText(value.at(index));  
           setItem(row_count, index, item);  
       }  
       rowHeghtList.append(height);  
       tableHeight += height;   
       resize(tableWidth, tableHeight);  
   }  
     
     
   void NoFocusDelegate::paint(QPainter* painter, const QStyleOptionViewItem & option, const QModelIndex &index) const  
   {  
       QStyleOptionViewItem itemOption(option);  
       if (itemOption.state & QStyle::State_HasFocus)  
           itemOption.state = itemOption.state ^ QStyle::State_HasFocus;  
       QStyledItemDelegate::paint(painter, itemOption, index);  
   }  
     
   void Table::setRowH(const int &index, const int &height)  
   {  
     setRowHeight(index, height);  
     if (rowHeghtList.count() <= index + 1) {  
       rowHeghtList.append(height);  
     }  
     else {  
       rowHeghtList[index+1] = height;  
     }  
     tableHeight = 0;  
     for(int index = 0; index < rowHeghtList.count(); index++)  
        tableHeight += rowHeghtList.at(index);  
     resize(tableWidth, tableHeight);  
   }  
     
   void Table::createActions()  
   {  
     popMenu = new QMenu();  
     actionName = new QAction(this);  
     actionSize = new QAction(this);  
     actionType = new QAction(this);  
     actionDate = new QAction(this);  
     actionOpen = new QAction(this);     
     actionDownload = new QAction(this);  
     actionFlush = new QAction(this);  
     actionDelete = new QAction(this);  
     actionRename = new QAction(this);  
     actionCreateFolder = new QAction(this);  
        
     actionOpen->setText(tr("打开"));  
     actionDownload->setText(tr("下载"));  
     actionFlush->setText(tr("刷新"));  
     actionDelete->setText(tr("删除"));  
     actionRename->setText(tr("重命名"));  
     actionCreateFolder->setText(tr("新建文件夹"));  
     actionName->setText(tr("名称"));  
     actionSize->setText(tr("大小"));  
     actionType->setText(tr("项目类型"));  
     actionDate->setText(tr("修改日期"));  
          
     actionFlush->setShortcut(QKeySequence::Refresh);  
     connect(actionRename, SIGNAL(triggered()), this, SLOT(slotActionRename()));  
   }  
     
   void Table::contextMenuEvent(QContextMenuEvent *event)  
   {  
     popMenu->clear();  
     QPoint point = event->pos();  
     rightClickedItem = this->itemAt(point);  
     if(rightClickedItem != NULL) {  
       popMenu->addAction(actionDownload);  
       popMenu->addAction(actionFlush);  
       popMenu->addSeparator();  
       popMenu->addAction(actionDelete);  
       popMenu->addAction(actionRename);  
       popMenu->addSeparator();  
       popMenu->addAction(actionCreateFolder);  
       QMenu *sortStyle = popMenu->addMenu(tr("排序"));  
       sortStyle->addAction(actionName);  
       sortStyle->addAction(actionSize);  
       sortStyle->addAction(actionType);  
       sortStyle->addAction(actionDate);  
             
       popMenu->exec(QCursor::pos());  
       event->accept();  
     }  
   }  
     
   QModelIndex Table::moveCursor(QAbstractItemView::CursorAction cursorAction, Qt::KeyboardModifiers modifiers)  
   {  
       //重写移动光标事件，当存在编辑项的时候，让光标永远位于当前项（编辑项）,否则返回父类  
       if(rightClickedItem && rightClickedItem->row() >= 0) {  
           return currentIndex();  
       }  
       else {  
          return QTableWidget::moveCursor(cursorAction, modifiers);  
       }  
   }  
     
     
   void Table::keyPressEvent(QKeyEvent *event)  
   {  
       if (event->key() == Qt::Key_Return || event->key() == Qt::Key_Enter) {  
           QTableWidgetItem *item = currentItem();  
           if (item) {  
               closePersistentEditor(item);  
               openPersistentEditor(item);  
               slotItemSelectionChanged();  
               dupFlag = false;  
           }  
       }  
   }  
     
   void Table::slotItemSelectionChanged()  
   {  
       //关闭编辑项  
       if (rightClickedItem && dupFlag == false) {  
           int editRow = rightClickedItem->row();  
           QTableWidgetItem *item = this->item(editRow, 0);  
           QMap<QTableWidgetItem *, QString>::iterator it;  
           for (it = fileMap.begin(); it != fileMap.end(); ++it) {  
               if (it.key() != item) {  
                   if (it.value() == item->text()) {  
                       dupFlag = true;  
                   }  
               }  
           }  
           if (dupFlag == false) {  
               this->closePersistentEditor(item);  
               rightClickedItem = NULL;  
           }  
           else {  
               QMessageBox::critical(this,tr("错误提示"),tr("文件重名"), tr("确定"));  
               setCurrentItem(item);  
           }  
       }  
       else {  
           dupFlag = false;  
       }  
   }  
     
   void Table::setItemFixed(bool flag)  
   {  
     if (flag == true)  
         horizontalHeader()->setResizeMode(QHeaderView::Fixed);  
     else  
         horizontalHeader()->setResizeMode(QHeaderView::Interactive);  
   }  
     
   bool Table::getSelectedRow(QList<int> &rowList)  
   {  
       //多选并获取所选行  
       QList<QTableWidgetItem *> items = this->selectedItems();  
       int itemCount = items.count();  
       if(itemCount <= 0) {  
           return false;  
       }  
       for (int index = 0; index < itemCount; index++) {  
           int itemRow = this->row(items.at(index));  
           rowList.append(itemRow);  
       }  
       return  true;  
   }  
     
   void Table::slotItemEntered(QTableWidgetItem *item)  
   {  
     if(!item)  
       return;  
     QString name = item->text();  
     if (name.isEmpty())  
       return;  
     QToolTip::showText(QCursor::pos(), name);  
   }  
     
   void Table::slotActionRename()  
   {  
       //获得当前节点并获取编辑名称  
       if (rightClickedItem) {  
           int editRow = rightClickedItem->row();  
           QTableWidgetItem *item = this->item(editRow, 0);   //编辑的行号及第一列  
           this->setCurrentCell(editRow, 0);  
           this->openPersistentEditor(item);                  //打开编辑项  
           this->editItem(item);  
       }  
   }

（3）tablewidget.h

1. #ifndef TABLEWIDGET_H  
   #define TABLEWIDGET_H  
   #include "table.h"  
     
   class TableWidget : public QWidget  
   {  
       Q_OBJECT  
     
   public:  
       TableWidget(QWidget *parent = 0);  
       ~TableWidget();  
     
   private:  
       bool ScanFile(const QString & path);  
     
   private:  
       Table *table;  
   };  
     
   #endif // TABLEWIDGET_H

（4）tablewidget.cpp

1. #include "tablewidget.h"  
     
   TableWidget::TableWidget(QWidget *parent)  
       : QWidget(parent)  
   {  
       QTextCodec*codec = QTextCodec::codecForName("utf8");  
       QTextCodec::setCodecForLocale(codec);  
       QTextCodec::setCodecForCStrings(codec);  
       QTextCodec::setCodecForTr(codec);  
       setWindowTitle(tr("文件浏览"));  
       table = new Table(this);  
     
       QStringList header;  
       header<<tr("文件名")<<tr("最后更改日期")<<tr("类型")<<tr("大小");  
       table->setColumnValue(4, header);  
     
       table->setHeaderWidth(0, 200);  
       table->setHeaderWidth(1, 150);  
       table->setHeaderWidth(2, 100);  
       table->setHeaderWidth(3, 100);  
       table->setHeaderHeight(30);  
       //table->setRowH(0, 200);  
       ScanFile(QApplication::applicationDirPath());  
   //    table->setRowHeight(46);  
       resize(800, 800);  
   }  
     
   TableWidget::~TableWidget()  
   {  
     
   }  
     
   //Qt实现遍历文件夹和文件目录  
   bool TableWidget::ScanFile(const QString &path)  
   {  
       QDir dir(path);  
       if (!dir.exists())  
           return false;  
   //    dir.setFilter(QDir::Dirs | QDir::Files | QDir::NoSymLinks | QDir::NoDotAndDotDot);  
   //    QFileInfoList list = dir.entryInfoList();  
   //    //QStringList list = dir.entryList();  
   //    for(int index = 0; index < list.count(); index++) {  
   //        QFileInfo fileInfo = list.at(index);  
   //        if (fileInfo.isDir()) {  
   //            ScanFile(fileInfo.filePath());  
   //        }  
   //        else {  
   //            qDebug() << "----------" << fileInfo.absoluteFilePath();  
   //        }  
   //    }  
       QDirIterator dirIterator(path, QDir::Dirs | QDir::Files | QDir::NoSymLinks| QDir::NoDotAndDotDot, QDirIterator::Subdirectories);  
       while(dirIterator.hasNext()) {  
           dirIterator.next();  
           QFileInfo fileInfo = dirIterator.fileInfo();  
           QString filePath = fileInfo.absoluteFilePath();  
           QFileIconProvider iconProvider;  
           QIcon icon;  
           if (fileInfo.isDir()) {          //获取指定文件图标  
               icon = iconProvider.icon(QFileIconProvider::Folder);  
           }  
           else {  
               icon = iconProvider.icon(fileInfo);  
           }  
           QFileIconProvider icon_provider;  
           QString typeFile = icon_provider.type(fileInfo);  
           table->addRowValue(30, QStringList()<< filePath <<fileInfo.lastModified().toString("yyyy-MM-dd hh:mm:ss")  
                                               <<typeFile<<QString::number(fileInfo.size()/1024.0, &#39;f&#39;, 2)+"KB", icon);  
       }  
       return true;  
     
   }

（5）main.cpp

1. #include "tablewidget.h"  
   #include <QApplication>  
     
   int main(int argc, char *argv[])  
   {  
       QApplication a(argc, argv);  
       TableWidget w;  
       w.show();  
     
       return a.exec();  
   }

（6）运行结果

（7）总结
        根据网上博客修改了：鼠标点击的选项会出现虚框、创建右键菜单、获取文件图标类型、右键编辑时Tab键的处理和重命名文件重名后表格更新的、递归扫描文件夹。

2、QTableWidget控件属性

一、禁止编辑表格
在默认情况下，表格里的字符是可以更改的。
比如双击一个单元格，就可以修改原来的内容，如果想禁止用户的这种操作，让这个表格对用户只读，可以这样：

1. ui.qtablewidget->setEditTriggers(QAbstractItemView::NoEditTriggers);

二、设置表格为选择整行

1. /*设置表格为整行选中*/  
   ui.qtablewidget->setSelectionBehavior(QAbstractItemView::SelectRows);

三、设置单个选中和多个选中
单个选中意味着每次只可以选中一个单元格，多个就是相当于可以选择”一片“那种模式。

1. /*设置允许多个选中*/   
   ui.qtablewidget->setSelectionMode(QAbstractItemView::ExtendedSelection);

四、表格表头的显示与隐藏
对于水平或垂直方向的表头，如果不想显示可以用以下方式进行（隐藏/显示）设置：

1. ui.qtablewidget->verticalHeader()->setVisible(true);    
   ui.qtablewidget->horizontalHeader()->setVisible(false);

五、设置具体单元格中字体的对齐方式

1. ui.qtablewidget->item(0, 0)->setTextAlignment(Qt::AlignHCenter);

六、设置具体单元格中字体格式

1. ui.qtablewidget->item(1, 0)->setBackgroundColor(QColor(0,60,10));     
   ui.qtablewidget->item(1, 0)->setTextColor(QColor(200,111,100));  
   ui.qtablewidget->item(1, 0)->setFont(QFont("Helvetica"));

七、设置具体单元格的值

1. ui.qtablewidget->setItem(1, 0, new QTableWidgetItem(str));

八、把QTableWidgetItem对象内容转换为QString

1. QString str =ui.qtablewidget->item(0, 0)->data(Qt::DisplayRole).toString();

九、具体单元格中添加控件

1. QComboBox *comBox = new QComboBox();  
   comBox->addItem("F");  
   comBox->addItem("M");  
   ui.qtablewidget->setCellWidget(0,3,comBox);

十、合并单元格

1. //合并单元格的效果  
   ui.qtablewidget->setSpan(2, 2, 3, 2);  
   //第一个参数：要改变的单元格行数  
   //第二个参数：要改变的单元格列数  
   //第三个参数：需要合并的行数  
   //第四个参数：需要合并的列数

十一、具体单元格中插入图片

1. ui.qtablewidget->setItem(3, 2, new QTableWidgetItem(QIcon("images/music.png"), "Music"));

十二、设置显示网格

1. ui.qtablewidget->setShowGrid(true);//显示表格线

十三、设置滚动条

1. ui.qtablewidget->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);//去掉水平滚动条

十四、设置列标签

1. //初始化界面  
       QStringList  HStrList;  
       HStrList.push_back(QString("name"));  
       HStrList.push_back(QString("id"));  
       HStrList.push_back(QString("age"));  
       HStrList.push_back(QString("sex"));  
       HStrList.push_back(QString("department"));  
         
     
       //设置行列数(只有列存在的前提下，才可以设置列标签)  
       int HlableCnt = HStrList.count();  
       ui.qtablewidget->setRowCount(10);  
       ui.qtablewidget->setColumnCount(HlableCnt);  
     
       //设置列标签  
       ui.qtablewidget->setHorizontalHeaderLabels(HStrList);

十五、设置行和列的大小设为与内容相匹配

1. ui.qtablewidget->resizeColumnsToContents();    
   ui.qtablewidget->resizeRowsToContents();

十六、设置字体

1. ui.qtablewidget->setFont(font);   //设置字体

十七、获取某一单元格的内容

1. QString strText = ui.qtablewidget->item(0, 0)->text();

3、QTableWidget美化

QSS样式表（根据需求修改颜色）：

1. QTableWidget  
   {  
   background: rgb(56,56,56);  
   alternate-background-color:rgb(48,51,55);  
   selection-background-color:qlineargradient(x1:0, y1:0, x2:0, y2:1, stop:0 rgb(56,56,56),stop:1 rgb(66,66,66));  
   }

1. QHeaderView::section  
   {  
   background-color: qlineargradient(x1:0, y1:0, x2:0, y2:1, stop:0 rgb(46,46,46),stop:1 rgb(56,56,56));  
   color: rgb(210,210,210);  
   padding-left: 4px;border: 1px solid #383838;  
   }

1. QScrollBar:vertical  
   {  
   border: 0px solid grey;  
   background: transparent;  
   width: 15px;  
   margin: 22px 0 22px 0;  
   }  
   QScrollBar::handle:vertical  
   {  
   background: qlineargradient(x1:0, y1:0, x2:1, y2:0, stop:0 rgb(46,46,46),stop:1 rgb(66,66,66));  
   min-height: 20px;  
   }  
   QScrollBar::add-line:vertical  
   {  
   border: 0px solid grey;  
   background: rgb(66,66,66);  
   height: 20px;  
   subcontrol-position: bottom;  
   subcontrol-origin: margin;  
   }  
   QScrollBar::sub-line:vertical  
   {  
   border: 0px solid grey;  
   background: rgb(56,56,56);  
   height: 20px;  
   subcontrol-position: top;  
   subcontrol-origin: margin;  
   }  
   QScrollBar::up-arrow:vertical, QScrollBar::down-arrow:vertical  
   {  
   border: 0px solid grey;  
   width: 3px;  
   height: 3px;  
   background: rgb(46,46,46);  
   }  
   QScrollBar::add-page:vertical, QScrollBar::sub-page:vertical  
   {  
   background: none;  
   }

四、总结

（1）源码中绝大部分的功能都没实现，Table也没进行完整的封装，可根据自己的需求修改代码。
（2）本代码的总结参考了网友的博客，在此感谢。

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