mainwindow.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
#include <QtGui>
#include <QtWidgets>
 
#include "mainwindow.h"
 
MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    QFrame *centralFrame = new QFrame(this);
 
    QLabel *nameLabel = new QLabel(tr("Comment:"), centralFrame);
    commentEdit = new QTextEdit(centralFrame);
    QLabel *dragLabel = new QLabel(tr("<p>Drag the icon to a filer "
                                      "window or the desktop background:</p>"),
                                      centralFrame);
    iconLabel = new QLabel(centralFrame);
    iconPixmap.load(":/images/file.png");
    iconLabel->setPixmap(iconPixmap);
 
    QGridLayout *grid = new QGridLayout(centralFrame);
    grid->addWidget(nameLabel, 0, 0);
    grid->addWidget(commentEdit, 1, 0, 1, 2);
    grid->addWidget(dragLabel, 2, 0);
    grid->addWidget(iconLabel, 2, 1);
 
    statusBar();
    setCentralWidget(centralFrame);
    setWindowTitle(tr("Dragging"));
}
 
//! [0]
void MainWindow::mousePressEvent(QMouseEvent *event)
{
    if (event->button() == Qt::LeftButton
        && iconLabel->geometry().contains(event->pos())) {
 
//! [1]
        QDrag *drag = new QDrag(this);
        QMimeData *mimeData = new QMimeData;
 
        mimeData->setText(commentEdit->toPlainText());
        drag->setMimeData(mimeData);
//! [1]
        drag->setPixmap(iconPixmap);
 
        Qt::DropAction dropAction = drag->exec();
//! [0]
 
        QString actionText;
        switch (dropAction) {
            case Qt::CopyAction:
                actionText = tr("The text was copied.");
                break;
            case Qt::MoveAction:
                actionText = tr("The text was moved.");
                break;
            case Qt::LinkAction:
                actionText = tr("The text was linked.");
                break;
            case Qt::IgnoreAction:
                actionText = tr("The drag was ignored.");
                break;
            default:
                actionText = tr("Unknown action.");
                break;
        }
        statusBar()->showMessage(actionText);
//! [2]
    }
}
//! [2]