QML TableView 从特定单元格(选定行 + 特定列)获取数据

问题描述：

我有 QML TableView 和 QSqlQueryModel.我需要选择任何行并从表的每一列中获取数据以分隔 TextField.

I have QML TableView with QSqlQueryModel. I need to select any row and get data from every column of table to separate TextField.

这是 abonentstable.h:

Here is abonentstable.h:

#pragma once

#include <QObject>
#include <QSqlQueryModel>

class AbonentsSqlModel : public QSqlQueryModel
{
    Q_OBJECT

public:
    explicit AbonentsSqlModel(QObject *parent = 0);

    void setQuery(const QString &query, const QSqlDatabase &db = QSqlDatabase());
    QVariant data(const QModelIndex &index, int role) const;
    QHash<int, QByteArray> roleNames() const { return m_roleNames; }

private:
    void generateRoleNames();
    QHash<int, QByteArray> m_roleNames;
};

abonentstable.cpp:

#include "abonentstable.h"

#include <QSqlRecord>
#include <QSqlField>

AbonentsSqlModel::AbonentsSqlModel(QObject *parent) : QSqlQueryModel(parent)
{
    QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
    db.setDatabaseName("data_base.sqlite");
    db.open();
}

void AbonentsSqlModel::setQuery(const QString &query, const QSqlDatabase &db)
{
    QSqlQueryModel::setQuery(query, db);
    generateRoleNames();
}

void AbonentsSqlModel::generateRoleNames()
{
    m_roleNames.clear();
    for( int i = 0; i < record().count(); i ++) {
        m_roleNames.insert(Qt::UserRole + i + 1, record().fieldName(i).toUtf8());
    }
}

QVariant AbonentsSqlModel::data(const QModelIndex &index, int role) const
{
    QVariant value;

    if(role < Qt::UserRole) {
        value = QSqlQueryModel::data(index, role);
    }

    else {
        int columnIdx = role - Qt::UserRole - 1;
        QModelIndex modelIndex = this->index(index.row(), columnIdx);
        value = QSqlQueryModel::data(modelIndex, Qt::DisplayRole);
    }

    return value;
}

Table.qml:

TableView {
    id: table

    model: abonents

    ....

    TableViewColumn {
        delegate: Text {
            text: " " + model.name + " " + model.surname
            font.pointSize: 20
        }    
        width: 575
    }

    TableViewColumn {
        delegate: Text {
            text: " " + model.phone
            font.pointSize: 20
        }    
        width: 575
    }

    TableViewColumn {
        delegate: Text {
            text: " " + model.ip_address
            font.pointSize: 20
        }    
        width: 525
    }
}

还有一些文本字段:

TextField {
    id:  leftText
}

TextField {
     id:  centerText
}

TextField {
    id:  rightText
}

这个 sqlite 表有 4 列，我需要从选定的行获取数据到这些文本字段:2 列向左，1 列居中，1 列向右.

This sqlite table has 4 columns, and I need to get data from selected row to those text fields: 2 columns to left, 1 to center and 1 to right.

答

当用户单击有效行时，它会发出 clicked(int row) 信号.然后，您可以获取该 row 的值，根据您的要求格式化文本并在三个 TextField 中设置值.例如，在您的情况下:

When the user clicks a valid row it is emitted the clicked(int row) signal. Then, you can get the values for that row, format the text depending on your requirements and set the values in the three TextField. For example, in your case:

TableView {
    id: table

    model: abonents

    ... (your TableViewColumn components) ...    

    onClicked: {
        leftText.text = abonents.get(row).name + " " + libraryModel.get(row).surname;
        centerText.text = abonents.get(row).phone;
        rightText.text = abonents.get(row).ip_address;
    }
}

请让我使用我的自己的答案向您展示一个完整的示例:

Please, let me please use my own answer to show you a complete example:

import QtQuick 2.2
import QtQuick.Window 2.2
import QtQuick.Controls 1.4

ApplicationWindow {
    id: window
    visible: true
    title: "Table View Example"

    TableView {
        y: 70
        width: 500

        TableViewColumn {
            role: "title"
            title: "Title"
            width: 100
        }
        TableViewColumn {
            role: "author"
            title: "Author"
            width: 100
        }

        TableViewColumn{
            width: 300
            delegate: Text {
                text: model.title + " "  + model.author
                font.family: "Courier New"
                font.pixelSize: 18
                color: "red"
            }
        }

        onClicked: {
            leftText.text = libraryModel.get(row).title + " " + libraryModel.get(row).author;
            centerText.text = libraryModel.get(row).title;
            rightText.text = libraryModel.get(row).author;
        }

        model: libraryModel

        ListModel {
            id: libraryModel
            ListElement {
                title: "A Masterpiece"
                author: "Gabriel"
            }
            ListElement {
                title: "Brilliance"
                author: "Jens"
            }
            ListElement {
                title: "Outstanding"
                author: "Frederik"
            }
        }
    }

    TextField {
        id:  leftText
    }

    TextField {
        id:  centerText
        anchors.left: leftText.right
    }

    TextField {
        id:  rightText
        anchors.left: centerText.right
    }
}

QML TableView 从特定单元格(选定行 + 特定列)获取数据

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