Qt:Документация 4.3.2/draganddrop-fridgemagnets-draglabel-cpp
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[править] draglabel.cpp Example File
draganddrop/fridgemagnets/draglabel.cpp
/**************************************************************************** ** ** Copyright (C) 2005-2007 Trolltech ASA. All rights reserved. ** ** This file is part of the example classes of the Qt Toolkit. ** ** This file may be used under the terms of the GNU General Public ** License version 2.0 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 GNU ** General Public Licensing requirements will be met: ** http://trolltech.com/products/qt/licenses/licensing/opensource/ ** ** If you are unsure which license is appropriate for your use, please ** review the following information: ** http://trolltech.com/products/qt/licenses/licensing/licensingoverview ** or contact the sales department at sales@trolltech.com. ** ** In addition, as a special exception, Trolltech gives you certain ** additional rights. These rights are described in the Trolltech GPL ** Exception version 1.0, which can be found at ** http://www.trolltech.com/products/qt/gplexception/ and in the file ** GPL_EXCEPTION.txt in this package. ** ** In addition, as a special exception, Trolltech, as the sole copyright ** holder for Qt Designer, grants users of the Qt/Eclipse Integration ** plug-in the right for the Qt/Eclipse Integration to link to ** functionality provided by Qt Designer and its related libraries. ** ** Trolltech reserves all rights not expressly granted herein. ** ** Trolltech ASA (c) 2007 ** ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. ** ****************************************************************************/ #include <QtGui> #include "draglabel.h" DragLabel::DragLabel(const QString &text, QWidget *parent) : QLabel(parent) { QFontMetrics metric(font()); QSize size = metric.size(Qt::TextSingleLine, text); QImage image(size.width() + 12, size.height() + 12, QImage::Format_ARGB32_Premultiplied); image.fill(qRgba(0, 0, 0, 0)); QFont font; font.setStyleStrategy(QFont::ForceOutline); QPainter painter; painter.begin(&image); painter.setRenderHint(QPainter::Antialiasing); painter.setBrush(Qt::white); painter.drawRoundRect(QRectF(0.5, 0.5, image.width()-1, image.height()-1), 25, 25); painter.setFont(font); painter.setBrush(Qt::black); painter.drawText(QRect(QPoint(6, 6), size), Qt::AlignCenter, text); painter.end(); setPixmap(QPixmap::fromImage(image)); labelText = text; } void DragLabel::mousePressEvent(QMouseEvent *event) { QByteArray itemData; QDataStream dataStream(&itemData, QIODevice::WriteOnly); dataStream << labelText << QPoint(event->pos() - rect().topLeft()); QMimeData *mimeData = new QMimeData; mimeData->setData("application/x-fridgemagnet", itemData); mimeData->setText(labelText); QDrag *drag = new QDrag(this); drag->setMimeData(mimeData); drag->setHotSpot(event->pos() - rect().topLeft()); drag->setPixmap(*pixmap()); hide(); if (drag->exec(Qt::MoveAction | Qt::CopyAction, Qt::CopyAction) == Qt::MoveAction) close(); else show(); }
Copyright © 2007 Trolltech | Trademarks | Qt 4.3.2
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