1. Qt 模型視圖代理

• Qt 模型視圖代理，也可以稱為 MVD 模式
  • 模型(model)、視圖(view)、代理(delegate)
  • 主要用來顯示編輯數(shù)據(jù)

1.1 模型

• 模型 (Model) 是視圖與原始數(shù)據(jù)之間的接口
  • 原始數(shù)據(jù)可以是：數(shù)據(jù)庫的一個數(shù)據(jù)表、內(nèi)存中的一個 StringList，磁盤文件結(jié)構(gòu)等
  • QAbstractItemModel 是所有模型的祖宗類，其它 model 類都派生于它

1.2 視圖

• 視圖 (View) 是顯示和編輯數(shù)據(jù)的界面組件
  • 主要的視圖組件有 QListView、QTreeView 和 QTableView
  • QListWidget、QTreeWidget 和 QTableWidget 是視圖類的簡化版
    • 它們不使用數(shù)據(jù)模型，而是將數(shù)據(jù)直接存儲在組件的每個項里
  • QAbstractItemView 是所有視圖的祖宗類，其它 view 類都派生于它

1.3 代理

• 代理 (Delegate) 為視圖組件提供數(shù)據(jù)編輯器
  • 如在表格組件中，編輯一個單元格的數(shù)據(jù)時，缺省是使用一個 QLineEdit 編輯框
  • 代理負責(zé)從數(shù)據(jù)模型獲取相應(yīng)的數(shù)據(jù)，然后顯示在編輯器里，修改數(shù)據(jù)后，又將其保存到數(shù)據(jù)模型中

2. QTableView 應(yīng)用

• tableView.pro

  QT       += core gui// 使用 QAxObject 需添加下行
  // The QAxObject class provides a QObject that wraps a COM object.
  greaterThan(QT_MAJOR_VERSION, 4): QT += widgets axcontainer
  

2.1 widget.ui

2.2 主窗口

2.2.1 widget.h

#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>
#include <QStandardItemModel>
#include <QItemSelectionModel>
#include "cintspindelegate.h"
#include "cfloatspindelegate.h"
#include "ccomboboxdelegate.h"QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACEclass Widget : public QWidget {Q_OBJECTpublic:Widget(QWidget *parent = nullptr);~Widget();private slots:void on_btnOpenExcel_clicked();void on_btnReshowData_clicked();void OnCurrentChanged(const QModelIndex &current, const QModelIndex &previous);void on_btnAppendLast_clicked();void on_btnAppend_clicked();void on_btnDeleteSelectedLine_clicked();private:Ui::Widget *ui;QStandardItemModel  *m_pItemModel;        // 數(shù)據(jù)模型QItemSelectionModel *m_pSelectionModel;   // Item 選擇模型CIntSpinDelegate    m_intSpinDelegate;    // 整型數(shù) spinbox 代理CFloatSpinDelegate  m_floatSpinDelegate;  // 浮點數(shù) spinbox 代理CComboBoxDelegate   m_comboBoxDelegate;   // combobox 代理
};
#endif // WIDGET_H

2.2.2 widget.cpp

#include "widget.h"
#include "ui_widget.h"
#include <QAxObject>
#include <QFileDialog>
#include <QStandardPaths>static const int COLUMN_COUNT = 7;Widget::Widget(QWidget *parent) : QWidget(parent), ui(new Ui::Widget) {ui->setupUi(this);showMaximized();m_pItemModel = new QStandardItemModel(1, COLUMN_COUNT, this);m_pSelectionModel = new QItemSelectionModel(m_pItemModel);  // Item 選擇模型// 選擇當(dāng)前單元格變化時的信號與槽connect(m_pSelectionModel, &QItemSelectionModel::currentChanged, this, &Widget::OnCurrentChanged);ui->tableView->setModel(m_pItemModel);                // 設(shè)置數(shù)據(jù)模型ui->tableView->setSelectionModel(m_pSelectionModel);  // 設(shè)置選擇模型ui->tableView->setSelectionMode(QAbstractItemView::ExtendedSelection);ui->tableView->setSelectionBehavior(QAbstractItemView::SelectItems);// 給第 3，4，5 列設(shè)置自定義代理組件ui->tableView->setItemDelegateForColumn(3, &m_floatSpinDelegate);ui->tableView->setItemDelegateForColumn(4, &m_intSpinDelegate);ui->tableView->setItemDelegateForColumn(5, &m_comboBoxDelegate);
}Widget::~Widget() {delete ui;
}// 打開 excel
void Widget::on_btnOpenExcel_clicked() {QAxObject *excel = new QAxObject(this);excel->setControl("Excel.Application");excel->setProperty("Visible", false);  // 顯示窗體看效果，選擇 ture 將會看到 excel 表格被打開excel->setProperty("DisplayAlerts", true);QAxObject *workbooks = excel->querySubObject("WorkBooks");  // 獲取工作簿(excel文件)集合QString str = QFileDialog::getOpenFileName(this, u8"打開excel","D:/MyQtCreatorProject/9_2_tableView",u8"Excel 文件(*.xls *.xlsx)");// 打開剛才選定的 excelworkbooks->dynamicCall("Open(const QString&)", str);QAxObject *workbook = excel->querySubObject("ActiveWorkBook");QAxObject *worksheet = workbook->querySubObject("WorkSheets(int)",1);QAxObject *usedRange = worksheet->querySubObject("UsedRange");   // 獲取表格中的數(shù)據(jù)范圍QVariant var = usedRange->dynamicCall("Value");  // 將所有的數(shù)據(jù)讀取到 QVariant 容器中保存QList<QList<QVariant>> excel_list;               // 用于將 QVariant 轉(zhuǎn)換為 Qlist 的二維數(shù)組QVariantList varRows = var.toList();if (varRows.isEmpty()) {return;}const int row_count = varRows.size();QVariantList rowData;for (int i = 0; i < row_count; ++i) {rowData = varRows[i].toList();excel_list.push_back(rowData);}// 將每一行的內(nèi)容放到 contentListQList<QStringList> contentList;for (int i = 0; i < row_count; i++) {QList<QVariant> curList = excel_list.at(i);int curRowCount = curList.size();QStringList oneLineStrlist;for (int j = 0; j < curRowCount; j++) {QString content = curList.at(j).toString();oneLineStrlist << content;}contentList << oneLineStrlist;}workbook->dynamicCall("Close(Boolean)", false);excel->dynamicCall("Quit(void)");delete excel;// 解析 contentList，填充 tableViewint rowCounts = contentList.size();QStandardItem *aItem;// 遍歷行for (int i = 0; i < rowCounts; i++) {QStringList tmpList = contentList[i];if(i == 0) {// 設(shè)置表頭m_pItemModel->setHorizontalHeaderLabels(tmpList);} else {int j;for (j = 0; j < COLUMN_COUNT - 1; j++) {// 不包含最后一列aItem = new QStandardItem(tmpList.at(j));m_pItemModel->setItem(i-1, j, aItem);       // 為模型的某個行列位置設(shè)置 Item}// 設(shè)置最后一列aItem = new QStandardItem(contentList[0].at(j));  // 獲取最后一列的指針aItem->setCheckable(true);  // 設(shè)置可以使用 check 控件if (tmpList.at(j) == "0")aItem->setCheckState(Qt::Unchecked);  // 根據(jù)數(shù)據(jù)設(shè)置 check 狀態(tài)elseaItem->setCheckState(Qt::Checked);m_pItemModel->setItem(i-1 , j, aItem);    // 設(shè)置最后一列}}
}// 選擇單元格變化時的響應(yīng)
void Widget::OnCurrentChanged(const QModelIndex &current, const QModelIndex &previous) {Q_UNUSED(previous);if (current.isValid()) {  // 當(dāng)前模型索引有效ui->textEdit->clear();ui->textEdit->append(QString::asprintf(u8"當(dāng)前單元格：%d行，%d列",current.row(),current.column()));  // 顯示模型索引的行和列號QStandardItem *aItem;aItem = m_pItemModel->itemFromIndex(current);           // 從模型索引獲得 itemui->textEdit->append(u8"單元格內(nèi)容：" + aItem->text());  // 顯示 item 的文字內(nèi)容}
}// 在表格最后一行添加
void Widget::on_btnAppendLast_clicked() {QList<QStandardItem*> aItemList;QStandardItem *aItem;for (int i = 0; i < COLUMN_COUNT - 1; i++) {  // 不包含最后 1 列aItem = new QStandardItem(u8"自定義");aItemList << aItem;}// 獲取最后一列的表頭文字QString str = m_pItemModel->headerData(m_pItemModel->columnCount()-1, Qt::Horizontal, Qt::DisplayRole).toString();aItem = new QStandardItem(str);aItem->setCheckable(true);aItemList<<aItem;   // 添加到容器m_pItemModel->insertRow(m_pItemModel->rowCount(), aItemList);  // 插入一行，需要每個 Cell 的 ItemQModelIndex curIndex = m_pItemModel->index(m_pItemModel->rowCount()-1, 0);  // 創(chuàng)建最后一行的 ModelIndex// 如果之前點擊了表格，清空選擇項m_pSelectionModel->clearSelection();// 設(shè)置剛插入的行為當(dāng)前選擇行m_pSelectionModel->setCurrentIndex(curIndex, QItemSelectionModel::Select);
}void Widget::on_btnAppend_clicked() {QList<QStandardItem*> aItemList;QStandardItem *aItem;for(int i = 0; i < COLUMN_COUNT-1; i++) {aItem = new QStandardItem(u8"自定義");aItemList << aItem;}// 獲取表頭文字QString str = m_pItemModel->headerData(m_pItemModel->columnCount()-1, Qt::Horizontal, Qt::DisplayRole).toString();aItem = new QStandardItem(str);aItem->setCheckable(true);aItemList<<aItem;QModelIndex curIndex = m_pSelectionModel->currentIndex();  // 獲取當(dāng)前選中項的模型索引m_pItemModel->insertRow(curIndex.row(), aItemList);  // 在當(dāng)前行的前面插入一行m_pSelectionModel->clearSelection();                // 清除已有選擇m_pSelectionModel->setCurrentIndex(curIndex, QItemSelectionModel::Select);
}// 刪除選擇的行
void Widget::on_btnDeleteSelectedLine_clicked() {QModelIndex curIndex = m_pSelectionModel->currentIndex();  // 獲取當(dāng)前選擇單元格的模型索引if (curIndex.row() == m_pItemModel->rowCount() - 1) {  // 如果是最后一行m_pItemModel->removeRow(curIndex.row());           // 刪除最后一行} else {m_pItemModel->removeRow(curIndex.row());           // 刪除一行，并重新設(shè)置當(dāng)前選擇行m_pSelectionModel->setCurrentIndex(curIndex, QItemSelectionModel::Select);}
}// 將 tableView 的數(shù)據(jù)顯示在 textEdit
void Widget::on_btnReshowData_clicked() {ui->textEdit->clear();  // 清空QStandardItem *aItem;QString str;// 獲取表頭文字int i, j;for (i = 0; i < m_pItemModel->columnCount(); i++) {aItem = m_pItemModel->horizontalHeaderItem(i);  // 獲取表頭的一個項數(shù)據(jù)str = str + aItem->text() + "\t";  // 用 tab 間隔文字}ui->textEdit->append(str);  // 添加為文本框的一行//獲取數(shù)據(jù)區(qū)的每行for (i = 0; i < m_pItemModel->rowCount(); i++) {str = "";for (j = 0; j<m_pItemModel->columnCount()-1; j++) {aItem = m_pItemModel->item(i,j);str = str + aItem->text() + QString::asprintf("\t");  //以 tab 分隔}aItem = m_pItemModel->item(i, j);  // 最后一行if (aItem->checkState() == Qt::Checked)str = str + "1";elsestr = str + "0";ui->textEdit->append(str);}
}

2.3 整型數(shù) spinbox 代理

2.3.1 cintspindelegate.h

#ifndef CINTSPINDELEGATE_H
#define CINTSPINDELEGATE_H#include <QStyledItemDelegate>class CIntSpinDelegate : public QStyledItemDelegate {Q_OBJECT
public:CIntSpinDelegate(QObject *parent=0);// 自定義代理組件必須繼承以下 4 個函數(shù)// 創(chuàng)建編輯組件QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option,const QModelIndex &index) const Q_DECL_OVERRIDE;// 從數(shù)據(jù)模型獲取數(shù)據(jù)，顯示到代理組件中void setEditorData(QWidget *editor, const QModelIndex &index) const Q_DECL_OVERRIDE;// 將代理組件的數(shù)據(jù)，保存到數(shù)據(jù)模型中void setModelData(QWidget *editor, QAbstractItemModel *model,const QModelIndex &index) const Q_DECL_OVERRIDE;// 更新代理編輯組件的大小void updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option,const QModelIndex &index) const Q_DECL_OVERRIDE;
};#endif // CINTSPINDELEGATE_H

2.3.2 cintspindelegate.cpp

#include "cintspindelegate.h"
#include <QSpinBox>CIntSpinDelegate::CIntSpinDelegate(QObject *parent) : QStyledItemDelegate(parent) {}QWidget *CIntSpinDelegate::createEditor(QWidget *parent,const QStyleOptionViewItem &option, const QModelIndex &index) const {// 創(chuàng)建代理編輯組件Q_UNUSED(option);Q_UNUSED(index);QSpinBox *editor = new QSpinBox(parent);  // 創(chuàng)建一個 QSpinBoxeditor->setFrame(false);  // 設(shè)置為無邊框editor->setMinimum(0);editor->setMaximum(120);return editor;  // 返回此編輯器
}void CIntSpinDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const {// 從數(shù)據(jù)模型獲取數(shù)據(jù)，顯示到代理組件中// 獲取數(shù)據(jù)模型的模型索引指向的單元的數(shù)據(jù)int value = index.model()->data(index, Qt::EditRole).toInt();QSpinBox *spinBox = static_cast<QSpinBox*>(editor);  // 強制類型轉(zhuǎn)換spinBox->setValue(value);  // 設(shè)置編輯器的數(shù)值
}void CIntSpinDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const {// 將代理組件的數(shù)據(jù)，保存到數(shù)據(jù)模型中QSpinBox *spinBox = static_cast<QSpinBox*>(editor);  // 強制類型轉(zhuǎn)換spinBox->interpretText();      // 解釋數(shù)據(jù)，如果數(shù)據(jù)被修改后，就觸發(fā)信號int value = spinBox->value();  // 獲取 spinBox 的值model->setData(index, value, Qt::EditRole); //更新到數(shù)據(jù)模型
}void CIntSpinDelegate::updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const {// 設(shè)置組件大小Q_UNUSED(index);editor->setGeometry(option.rect);
}

2.4 浮點數(shù) spinbox 代理

2.4.1 cfloatspindelegate.h

#ifndef CFLOATSPINDELEGATE_H
#define CFLOATSPINDELEGATE_H#include <QObject>
#include <QWidget>
#include <QStyledItemDelegate>class CFloatSpinDelegate : public QStyledItemDelegate {Q_OBJECT
public:CFloatSpinDelegate(QObject *parent=0);// 自定義代理組件必須繼承以下4個函數(shù)// 創(chuàng)建編輯組件QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option,const QModelIndex &index) const Q_DECL_OVERRIDE;void setEditorData(QWidget *editor, const QModelIndex &index) const Q_DECL_OVERRIDE;void setModelData(QWidget *editor, QAbstractItemModel *model,const QModelIndex &index) const Q_DECL_OVERRIDE;void updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option,const QModelIndex &index) const Q_DECL_OVERRIDE;
};#endif // CFLOATSPINDELEGATE_H

2.4.2 cfloatspindelegate.cpp

#include "cfloatspindelegate.h"
#include <QDoubleSpinBox>CFloatSpinDelegate::CFloatSpinDelegate(QObject *parent):QStyledItemDelegate(parent) {}QWidget *CFloatSpinDelegate::createEditor(QWidget *parent,const QStyleOptionViewItem &option, const QModelIndex &index) const {Q_UNUSED(option);Q_UNUSED(index);QDoubleSpinBox *editor = new QDoubleSpinBox(parent);editor->setFrame(false);editor->setMinimum(0);editor->setDecimals(2);editor->setMaximum(100);return editor;
}void CFloatSpinDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const {float value = index.model()->data(index, Qt::EditRole).toFloat();QDoubleSpinBox *spinBox = static_cast<QDoubleSpinBox*>(editor);spinBox->setValue(value);
}void CFloatSpinDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const {QDoubleSpinBox *spinBox = static_cast<QDoubleSpinBox*>(editor);spinBox->interpretText();float value = spinBox->value();QString str = QString::asprintf("%.2f", value);model->setData(index, str, Qt::EditRole);
}void CFloatSpinDelegate::updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const {editor->setGeometry(option.rect);
}

2.5 combobox 代理

2.5.1 ccomboboxdelegate.h

#ifndef CCOMBOBOXDELEGATE_H
#define CCOMBOBOXDELEGATE_H#include <QItemDelegate>class CComboBoxDelegate : public QItemDelegate {Q_OBJECTpublic:CComboBoxDelegate(QObject *parent=0);// 自定義代理組件必須繼承以下4個函數(shù)QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option,const QModelIndex &index) const Q_DECL_OVERRIDE;void setEditorData(QWidget *editor, const QModelIndex &index) const Q_DECL_OVERRIDE;void setModelData(QWidget *editor, QAbstractItemModel *model,const QModelIndex &index) const Q_DECL_OVERRIDE;void updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option,const QModelIndex &index) const Q_DECL_OVERRIDE;
};#endif // CCOMBOBOXDELEGATE_H

2.5.2 ccomboboxdelegate.cpp

#include "ccomboboxdelegate.h"
#include <QComboBox>CComboBoxDelegate::CComboBoxDelegate(QObject *parent) : QItemDelegate(parent) {}QWidget *CComboBoxDelegate::createEditor(QWidget *parent,const QStyleOptionViewItem &option, const QModelIndex &index) const {QComboBox *editor = new QComboBox(parent);editor->addItem(u8"優(yōu)");editor->addItem(u8"良");editor->addItem(u8"一般");return editor;
}void CComboBoxDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const {QString str = index.model()->data(index, Qt::EditRole).toString();QComboBox *comboBox = static_cast<QComboBox*>(editor);comboBox->setCurrentText(str);
}void CComboBoxDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const {QComboBox *comboBox = static_cast<QComboBox*>(editor);QString str = comboBox->currentText();model->setData(index, str, Qt::EditRole);
}void CComboBoxDelegate::updateEditorGeometry(QWidget *editor,const QStyleOptionViewItem &option, const QModelIndex &index) const {editor->setGeometry(option.rect);
}

3. QListView 應(yīng)用

3.1 widget.h

#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>
#include <QStringListModel>
#include <QMenu>QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACEclass Widget : public QWidget {Q_OBJECTpublic:Widget(QWidget *parent = nullptr);~Widget();private:void initMenu();private slots:void on_btnAddItem_clicked();void on_btnDeleteItem_clicked();void on_btnInsert_clicked();void on_btnClearAllData_clicked();void on_btnReshow_clicked();void on_showRightMenu(const QPoint& pos);void OnActionDelete();// 鏈接 listview 的 clicked 信號void on_listView_clicked(const QModelIndex &index);private:Ui::Widget *ui;QStringListModel* m_pStringListModel;QMenu *m_pMenu;
};
#endif // WIDGET_H

3.2 widget.cpp

#include "widget.h"
#include "ui_widget.h"
#include <QMenu>Widget::Widget(QWidget *parent) : QWidget(parent), ui(new Ui::Widget) {ui->setupUi(this);this->setWindowTitle(u8"QListView使用教程");QStringList strList;strList << u8"北京" << u8"上海" << u8"深圳" << u8"廣東"<< u8"南京" << u8"蘇州" << u8"西安";// 創(chuàng)建數(shù)據(jù)模型m_pStringListModel = new QStringListModel(this);// 為模型設(shè)置 StringList，會導(dǎo)入 StringList 的內(nèi)容m_pStringListModel->setStringList(strList);// 為 listView 設(shè)置數(shù)據(jù)模型ui->listView->setModel(m_pStringListModel);// 設(shè)置 listview 編輯屬性// 雙擊與選擇//ui->listView->setEditTriggers(QAbstractItemView::DoubleClicked | QAbstractItemView::SelectedClicked);initMenu();// listview 右鍵菜單ui->listView->setContextMenuPolicy(Qt::CustomContextMenu);connect(ui->listView, &QListView::customContextMenuRequested, this, &Widget::on_showRightMenu);
}Widget::~Widget() {delete ui;
}// 添加 item
void Widget::on_btnAddItem_clicked() {// 在尾部插入一空行, 不添加就把最后一行給替換了m_pStringListModel->insertRow(m_pStringListModel->rowCount());// 獲取最后一行QModelIndex index = m_pStringListModel->index(m_pStringListModel->rowCount() - 1, 0);m_pStringListModel->setData(index,"new item", Qt::DisplayRole);  // 設(shè)置顯示文字// 設(shè)置新添加的行選中ui->listView->setCurrentIndex(index);
}// 刪除選中的項
void Widget::on_btnDeleteItem_clicked() {// 獲取當(dāng)前選中的 modelIndexQModelIndex index = ui->listView->currentIndex();// 刪除當(dāng)前行m_pStringListModel->removeRow(index.row());
}// 插入一項
void Widget::on_btnInsert_clicked() {// 獲取選中 model IndexQModelIndex index=ui->listView->currentIndex();// 在當(dāng)前行的前面插入一行m_pStringListModel->insertRow(index.row());m_pStringListModel->setData(index, "inserted item", Qt::DisplayRole);ui->listView->setCurrentIndex(index);
}// 回顯 listview數(shù)據(jù)
void Widget::on_btnReshow_clicked() {// 獲取數(shù)據(jù)模型的 StringListQStringList tmpList = m_pStringListModel->stringList();ui->textEdit->clear();  // 文本框清空for (int i = 0; i < tmpList.count(); i++) {// 顯示數(shù)據(jù)模型的 StringList()返回的內(nèi)容ui->textEdit->append(tmpList.at(i));}
}// 清除所有數(shù)據(jù)
void Widget::on_btnClearAllData_clicked() {m_pStringListModel->removeRows(0, m_pStringListModel->rowCount());
}void Widget::initMenu() {m_pMenu = new QMenu(ui->listView);QAction *pAc1 = new QAction(u8"刪除", ui->listView);QAction *pAc2 = new QAction(u8"插入", ui->listView);QAction *pAc3 = new QAction(u8"置頂", ui->listView);QAction *pAc4 = new QAction(u8"排到最后", ui->listView);m_pMenu->addAction(pAc1);m_pMenu->addAction(pAc2);m_pMenu->addAction(pAc3);m_pMenu->addAction(pAc4);// 注意在 exec 前鏈接信號槽，因為 exec 會阻塞主線程，// 如果 connect 寫在 exec 代碼之后，信號槽將無法鏈接connect(pAc1, &QAction::triggered, this, &Widget::OnActionDelete);
}void Widget::on_showRightMenu(const QPoint& pos) {if (!((ui->listView->selectionModel()->selectedIndexes()).empty())) {m_pMenu->exec(QCursor::pos());  // 在當(dāng)前鼠標(biāo)位置顯示}
}void Widget::OnActionDelete() {// 獲取當(dāng)前 modelIndexQModelIndex index = ui->listView->currentIndex();// 刪除當(dāng)前行m_pStringListModel->removeRow(index.row());
}void Widget::on_listView_clicked(const QModelIndex &index) {ui->textEdit->clear();  // 文本框清空// 顯示 QModelIndex 的行、列號ui->textEdit->append(QString::asprintf(u8"當(dāng)前項:row=%d, column=%d",index.row(), index.column()));
}