我在网上搜索了很多东西，但是没有找到答案，这真的很奇怪，因为我认为它是大多数人都应该使用的基本功能（可能我不明白如何正确地将TableView与QtQuick.Controls 2配合使用。）。
问题是：我想知道我单击了哪一行，并且想访问该行特定列的数据（类似TableView.get（row，column））。在QtQuick.Controls 1.4中，有一些函数可以让我访问行（像这样），但是我找不到QtQuick.Control 2的行。也没有选择：和itemDelegate：会很有用。如何在QtQuick.Controls 2中实现这些东西？
我在MinGw上使用Qt 5.15.0。我有来自数据库的数据，这些数据通过QAbstractTableModel传递给QML 。
.cpp模型
#include "archiviosqlmodel.h"
#include <QSqlRecord>
#include <QSqlError>
#include <QSqlQuery>
#include <QDebug>
ArchivioSqlModel::ArchivioSqlModel(QObject *parent) :
QAbstractTableModel(parent)
{
db_4= QSqlDatabase::addDatabase(QStringLiteral("QSQLITE"), "def.db");
db_4.setDatabaseName("def.db");
if (!db_4.isOpen())
db_4.open();
QSqlQuery query(db_4);
query.exec("CREATE TABLE IF NOT EXISTS A (ID INTEGER PRIMARY KEY AUTOINCREMENT, B INTEGER, C CHAR(5), D CHAR(5), E CHAR(5));");
query.exec("INSERT INTO A (ID, B, C, D, E) VALUES (1, 2, 'AAAAA', 'BBBBB', 'CCCCC')");
query.exec("INSERT INTO A (ID, B, C, D, E) VALUES (2, 4, 'DDDDD', 'FFFFF', 'QQQQQ')");
query.exec("INSERT INTO A (ID, B, C, D, E) VALUES (3, 5, 'EEEEE', 'GGGGG', 'HHHHH')");
model.setQuery("SELECT * FROM A", db_4);
qDebug() << "Row Count " << model.rowCount() << "Column count " << model.columnCount();
}
ArchivioSqlModel::~ArchivioSqlModel()
{
db_4.close();
}
QVariant ArchivioSqlModel::headerData(int section, Qt::Orientation orientation, int role) const
{
if(role == Qt::DisplayRole)
{
if(orientation == Qt::Horizontal)
{
switch (section)
{
case 0:
return tr("ID");
case 1:
return tr("A");
case 2:
return tr("A");
case 3:
return tr("A");
case 4:
return tr("A");
}
}
}
return QVariant();
}
int ArchivioSqlModel::rowCount(const QModelIndex &parent) const
{
if (parent.isValid())
return 0;
return model.rowCount();
}
int ArchivioSqlModel::columnCount(const QModelIndex &parent) const
{
if (parent.isValid())
return 0;
return model.columnCount();
}
QVariant ArchivioSqlModel::data(const QModelIndex &index, int role) const
{
QVariant value;
if (!index.isValid())
return QVariant();
if(role == Qt::DisplayRole && index.row() >= 0 && index.row() < rowCount()
&& index.column() >= 0 && index.column() < columnCount())
{
QModelIndex modelIndex = this->index(index.row(), index.column());
value = model.data(modelIndex, Qt::DisplayRole);
return value;//QString("data %1-%2").arg(index.row()).arg(index.column());
}
return QVariant();
}
.h模型
#include <QSqlQueryModel>
class ArchivioSqlModel : public QAbstractTableModel
{
Q_OBJECT
public:
explicit ArchivioSqlModel(QObject *parent = 0);
Q_INVOKABLE QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const override;
int rowCount(const QModelIndex &parent = QModelIndex()) const override;
int columnCount(const QModelIndex &parent = QModelIndex()) const override;
QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
~ArchivioSqlModel() override;
signals:
void queryStrChanged();
public slots:
private:
const static char* COLUMN_NAMES[];
const static char* SQL_SELECT;
QSqlDatabase db_4;
QSqlQueryModel model;
QHash<int, QByteArray> m_roleNames;
};
main.qml
import QtQuick 2.12
import QtQuick.Window 2.12
import QtQuick.Controls 2.4
import Archive 1.0
Window {
visible: true
width: 640
height: 480
title: qsTr("Hello World")
Rectangle {
id: rectangle
x: 62
y: 106
width: 200
height: 200
color: "#000022"
border.width: 0
anchors.fill:parent
Rectangle {
id: rectangleBack
x: 10
y: 406
width: 64
height: 64
color: "#000033"
radius: 20
anchors.left: parent.left
anchors.leftMargin: 10
anchors.bottom: parent.bottom
anchors.bottomMargin: 10
border.width: 2
border.color: "#ffffff"
MouseArea {
id: mouseAreaBack
anchors.fill: parent
onClicked: {
if (stackView.depth > 1)
stackView.pop()
}
onPressed: {
rectangleBack.width = 64 - 4
rectangleBack.height = 64 - 4
}
onReleased: {
rectangleBack.width = 64
rectangleBack.height = 64
}
}
}
Text {
id: textArchive
height: 25
color: "#ffffff"
text: qsTr("Datas:")
font.family: "Arial"
verticalAlignment: Text.AlignVCenter
font.bold: true
fontSizeMode: Text.Fit
horizontalAlignment: Text.AlignHCenter
anchors.right: parent.right
anchors.rightMargin: 0
anchors.left: parent.left
anchors.leftMargin: 0
anchors.top: parent.top
anchors.topMargin: 10
font.pixelSize: 14
}
ArchivioSqlModel {
id: archiviomodel
}
Rectangle {
id: rectangle1
color: "#000022"
radius: 10
border.width: 2
border.color: "#ffffff"
anchors.right: parent.right
anchors.rightMargin: 5
anchors.left: parent.left
anchors.leftMargin: 5
anchors.bottom: rectangleBack.top
anchors.bottomMargin: 10
anchors.top: textArchive.bottom
anchors.topMargin: 10
TableView {
id: tableViewid
anchors.leftMargin: 5
anchors.bottomMargin: 5
anchors.rightMargin: 5
anchors.topMargin: 5
columnWidthProvider: function (column) { return 100; }
rowHeightProvider: function (column) { return 60; }
anchors.fill: parent
topMargin: columnsHeader.implicitHeight
model: archiviomodel
ScrollBar.horizontal: ScrollBar{}
ScrollBar.vertical: ScrollBar{}
clip: true
delegate: Rectangle {
Text {
id: textId
text: display
anchors.fill: parent
anchors.margins: 10
color: 'black'
font.pixelSize: 15
verticalAlignment: Text.AlignVCenter
}
MouseArea {
anchors.fill: parent
onClicked: {
console.log("prova:" + textId.text)
}
}
}
Rectangle { // mask the headers
z: 3
color: "#000033"
y: tableViewid.contentY
x: tableViewid.contentX
width: tableViewid.leftMargin
height: tableViewid.topMargin
}
Row {
id: columnsHeader
y: tableViewid.contentY
z: 2
Repeater {
model: tableViewid.columns > 0 ? tableViewid.columns : 1
Label {
width: tableViewid.columnWidthProvider(modelData)
height: 35
text: archiviomodel.headerData(modelData, Qt.Horizontal)
color: '#ffffff'
font.pixelSize: 15
padding: 10
verticalAlignment: Text.AlignVCenter
background: Rectangle {
radius: 10
color: "#000022"
}
}
}
}
ScrollIndicator.horizontal: ScrollIndicator { }
ScrollIndicator.vertical: ScrollIndicator { }
}
}
Rectangle {
id: rectangleOpenlap
x: 10
y: 406
width: 64
height: 64
color: "#000033"
radius: 20
anchors.right: parent.right
anchors.rightMargin: 10
anchors.bottom: parent.bottom
anchors.bottomMargin: 10
border.width: 2
border.color: "#ffffff"
MouseArea {
id: mouseAreaOpenlap
anchors.fill: parent
onClicked: {
console.log("Rows")
}
onPressed: {
rectangleOpenlap.width = 64 - 4
rectangleOpenlap.height = 64 - 4
}
onReleased: {
rectangleOpenlap.width = 64
rectangleOpenlap.height = 64
}
}
}
}
}
main.cpp
#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include "archiviosqlmodel.h"
int main(int argc, char *argv[])
{
QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
QGuiApplication app(argc, argv);
qmlRegisterType<ArchivioSqlModel>("Archive", 1, 0, "ArchivioSqlModel");
QQmlApplicationEngine engine;
const QUrl url(QStringLiteral("qrc:/main.qml"));
QObject::connect(&engine, &QQmlApplicationEngine::objectCreated,
&app, [url](QObject *obj, const QUrl &objUrl) {
if (!obj && url == objUrl)
QCoreApplication::exit(-1);
}, Qt::QueuedConnection);
engine.load(url);
return app.exec();
}
提前致谢！
要从模型访问数据，可以使用模型上下文属性和内置的显示角色：
MouseArea {
anchors.fill: parent
onClicked: {
console.log(model.display)
}
}
可以以类似方式设置模型数据。
上面基本上是下面的简短方法：
MouseArea {
anchors.fill: parent
onClicked: {
console.log(row, column, tableViewid.model.data(tableViewid.model.index(row, column)))
}
}
上面的代码使用index（）创建一个索引，然后可以将其传递给data（）
行和列属性提供给每个委托。
如果出于某种原因需要从委托外部从模型中获取数据，这也很有用。
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我来说两句