Drag and drop text : Drag Drop « Qt « C++

1. C++
2. Qt
3. Drag Drop

Drag and drop text

  
  
  
  
/****************************************************************************  
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QPixmap>
#include <QPoint>

class QLabel;
class QLineEdit;
class QMouseEvent;
class QTextEdit;

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = 0);

protected:
    void mousePressEvent(QMouseEvent *event);

private:
    QLabel *iconLabel;
    QLineEdit *nameEdit;
    QPixmap iconPixmap;
    QPoint dragStartPosition;
    QTextEdit *commentEdit;
};

#endif









#include <QtGui>

#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"));
}


void MainWindow::mousePressEvent(QMouseEvent *event)
{
    if (event->button() == Qt::LeftButton
        && iconLabel->geometry().contains(event->pos())) {

       QDrag *drag = new QDrag(this);
        QMimeData *mimeData = new QMimeData;

        mimeData->setText(commentEdit->toPlainText());
        drag->setMimeData(mimeData);
        drag->setPixmap(iconPixmap);

        Qt::DropAction dropAction = drag->exec();

        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);
    }
}







#include <QtGui>

#include "mainwindow.h"

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    MainWindow *window = new MainWindow;
    window->show();
    return app.exec();
}

   
    
  

Related examples in the same category