qt-everywhere-src-5.15.1/qtbase/examples/widgets/draganddrop/dropsite/dropsitewindow.cpp

/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
**   * Redistributions of source code must retain the above copyright
**     notice, this list of conditions and the following disclaimer.
**   * Redistributions in binary form must reproduce the above copyright
**     notice, this list of conditions and the following disclaimer in
**     the documentation and/or other materials provided with the
**     distribution.
**   * Neither the name of The Qt Company Ltd nor the names of its
**     contributors may be used to endorse or promote products derived
**     from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include <QtWidgets>

#include "droparea.h"
#include "dropsitewindow.h"

//! [constructor part1]
DropSiteWindow::DropSiteWindow()
{
    abstractLabel = new QLabel(tr("This example accepts drags from other "
                                  "applications and displays the MIME types "
                                  "provided by the drag object."));
    abstractLabel->setWordWrap(true);
    abstractLabel->adjustSize();
//! [constructor part1]

//! [constructor part2]
    dropArea = new DropArea;
    connect(dropArea, &DropArea::changed,
            this, &DropSiteWindow::updateFormatsTable);
//! [constructor part2]

//! [constructor part3]
    QStringList labels;
    labels << tr("Format") << tr("Content");

    formatsTable = new QTableWidget;
    formatsTable->setColumnCount(2);
    formatsTable->setEditTriggers(QAbstractItemView::NoEditTriggers);
    formatsTable->setHorizontalHeaderLabels(labels);
    formatsTable->horizontalHeader()->setStretchLastSection(true);
//! [constructor part3]

//! [constructor part4]
    clearButton = new QPushButton(tr("Clear"));
    copyButton = new QPushButton(tr("Copy"));
    quitButton = new QPushButton(tr("Quit"));

    buttonBox = new QDialogButtonBox;
    buttonBox->addButton(clearButton, QDialogButtonBox::ActionRole);
    buttonBox->addButton(copyButton, QDialogButtonBox::ActionRole);
#if !QT_CONFIG(clipboard)
    copyButton->setVisible(false);
#endif

    buttonBox->addButton(quitButton, QDialogButtonBox::RejectRole);

    connect(quitButton, &QAbstractButton::clicked, this, &QWidget::close);
    connect(clearButton, &QAbstractButton::clicked, dropArea, &DropArea::clear);
    connect(copyButton, &QAbstractButton::clicked, this, &DropSiteWindow::copy);
//! [constructor part4]

//! [constructor part5]
    QVBoxLayout *mainLayout = new QVBoxLayout(this);
    mainLayout->addWidget(abstractLabel);
    mainLayout->addWidget(dropArea);
    mainLayout->addWidget(formatsTable);
    mainLayout->addWidget(buttonBox);

    setWindowTitle(tr("Drop Site"));
    setMinimumSize(350, 500);
}
//! [constructor part5]

//! [updateFormatsTable() part1]
void DropSiteWindow::updateFormatsTable(const QMimeData *mimeData)
{
    formatsTable->setRowCount(0);
    copyButton->setEnabled(false);
    if (!mimeData)
        return;
//! [updateFormatsTable() part1]

//! [updateFormatsTable() part2]
    const QStringList formats = mimeData->formats();
    for (const QString &format : formats) {
        QTableWidgetItem *formatItem = new QTableWidgetItem(format);
        formatItem->setFlags(Qt::ItemIsEnabled);
        formatItem->setTextAlignment(Qt::AlignTop | Qt::AlignLeft);
//! [updateFormatsTable() part2]

//! [updateFormatsTable() part3]
        QString text;
        if (format == QLatin1String("text/plain")) {
            text = mimeData->text().simplified();
        } else if (format == QLatin1String("text/html")) {
            text = mimeData->html().simplified();
        } else if (format == QLatin1String("text/uri-list")) {
            QList<QUrl> urlList = mimeData->urls();
            for (int i = 0; i < urlList.size() && i < 32; ++i)
                text.append(urlList.at(i).toString() + QLatin1Char(' '));
        } else {
            QByteArray data = mimeData->data(format);
            for (int i = 0; i < data.size() && i < 32; ++i)
                text.append(QStringLiteral("%1 ").arg(uchar(data[i]), 2, 16, QLatin1Char('0')).toUpper());
        }
//! [updateFormatsTable() part3]

//! [updateFormatsTable() part4]
        int row = formatsTable->rowCount();
        formatsTable->insertRow(row);
        formatsTable->setItem(row, 0, new QTableWidgetItem(format));
        formatsTable->setItem(row, 1, new QTableWidgetItem(text));
    }

    formatsTable->resizeColumnToContents(0);
#if QT_CONFIG(clipboard)
    copyButton->setEnabled(formatsTable->rowCount() > 0);
#endif
}
//! [updateFormatsTable() part4]

void DropSiteWindow::copy()
{
#if QT_CONFIG(clipboard)
    QString text;
    for (int row = 0, rowCount = formatsTable->rowCount(); row < rowCount; ++row)
        text += formatsTable->item(row, 0)->text() + ": " + formatsTable->item(row, 1)->text() + '\n';
    QGuiApplication::clipboard()->setText(text);
#endif
}