- Qt 5.5
- Qt SQL
- Drill Down Example
- informationwindow.cpp Example File
- Qt 5.5.1 Reference Documentation

# informationwindow.cpp Example File

drilldown/informationwindow.cpp

    /****************************************************************************
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    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
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    ** This file is part of the examples of the Qt Toolkit.
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    ** $QT_BEGIN_LICENSE:BSD$
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    #include "informationwindow.h"

    InformationWindow::InformationWindow(int id, QSqlRelationalTableModel *items,
                                         QWidget *parent)
        : QDialog(parent)
    {
        QLabel *itemLabel = new QLabel(tr("Item: "));
        QLabel *descriptionLabel = new QLabel(tr("Description: "));
        QLabel *imageFileLabel = new QLabel(tr("Image file: "));

        createButtons();

        itemText = new QLabel;
        descriptionEditor = new QTextEdit;

        imageFileEditor = new QComboBox;
        imageFileEditor->setModel(items->relationModel(1));
        imageFileEditor->setModelColumn(items->relationModel(1)->fieldIndex("file"));

        mapper = new QDataWidgetMapper(this);
        mapper->setModel(items);
        mapper->setSubmitPolicy(QDataWidgetMapper::ManualSubmit);
        mapper->setItemDelegate(new QSqlRelationalDelegate(mapper));
        mapper->addMapping(imageFileEditor, 1);
        mapper->addMapping(itemText, 2, "text");
        mapper->addMapping(descriptionEditor, 3);
        mapper->setCurrentIndex(id);

        connect(descriptionEditor, SIGNAL(textChanged()),
                this, SLOT(enableButtons()));
        connect(imageFileEditor, SIGNAL(currentIndexChanged(int)),
                this, SLOT(enableButtons()));

        QFormLayout *formLayout = new QFormLayout;
        formLayout->addRow(itemLabel, itemText);
        formLayout->addRow(imageFileLabel, imageFileEditor);
        formLayout->addRow(descriptionLabel, descriptionEditor);

        QVBoxLayout *layout = new QVBoxLayout;
        layout->addLayout(formLayout);
        layout->addWidget(buttonBox);
        setLayout(layout);

        itemId = id;
        displayedImage = imageFileEditor->currentText();

        setWindowFlags(Qt::Window);
        enableButtons(false);
        setWindowTitle(itemText->text());
    }

    int InformationWindow::id()
    {
        return itemId;
    }

    void InformationWindow::revert()
    {
        mapper->revert();
        enableButtons(false);
    }

    void InformationWindow::submit()
    {
        QString newImage(imageFileEditor->currentText());

        if (displayedImage != newImage) {
            displayedImage = newImage;
            emit imageChanged(itemId, newImage);
        }

        mapper->submit();
        mapper->setCurrentIndex(itemId);

        enableButtons(false);
    }

    void InformationWindow::createButtons()
    {
        closeButton = new QPushButton(tr("&Close"));
        revertButton = new QPushButton(tr("&Revert"));
        submitButton = new QPushButton(tr("&Submit"));

        closeButton->setDefault(true);

        connect(closeButton, SIGNAL(clicked()), this, SLOT(close()));
        connect(revertButton, SIGNAL(clicked()), this, SLOT(revert()));
        connect(submitButton, SIGNAL(clicked()), this, SLOT(submit()));

        buttonBox = new QDialogButtonBox(this);
        buttonBox->addButton(submitButton, QDialogButtonBox::AcceptRole);
        buttonBox->addButton(revertButton, QDialogButtonBox::ResetRole);
        buttonBox->addButton(closeButton, QDialogButtonBox::RejectRole);
    }

    void InformationWindow::enableButtons(bool enable)
    {
        revertButton->setEnabled(enable);
        submitButton->setEnabled(enable);
    }