diff options
Diffstat (limited to 'examples/draganddrop/draggabletext/dragwidget.cpp')
-rw-r--r-- | examples/draganddrop/draggabletext/dragwidget.cpp | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/examples/draganddrop/draggabletext/dragwidget.cpp b/examples/draganddrop/draggabletext/dragwidget.cpp new file mode 100644 index 0000000000..df61c39476 --- /dev/null +++ b/examples/draganddrop/draggabletext/dragwidget.cpp @@ -0,0 +1,163 @@ +/**************************************************************************** +** +** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the examples of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** 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 Nokia Corporation and its Subsidiary(-ies) 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 <QtGui> + +#include "draglabel.h" +#include "dragwidget.h" + +DragWidget::DragWidget(QWidget *parent) + : QWidget(parent) +{ + QFile dictionaryFile(":/dictionary/words.txt"); + dictionaryFile.open(QIODevice::ReadOnly); + QTextStream inputStream(&dictionaryFile); + + int x = 5; + int y = 5; + + while (!inputStream.atEnd()) { + QString word; + inputStream >> word; + if (!word.isEmpty()) { + DragLabel *wordLabel = new DragLabel(word, this); + wordLabel->move(x, y); + wordLabel->show(); + wordLabel->setAttribute(Qt::WA_DeleteOnClose); + x += wordLabel->width() + 2; + if (x >= 195) { + x = 5; + y += wordLabel->height() + 2; + } + } + } + + QPalette newPalette = palette(); + newPalette.setColor(QPalette::Window, Qt::white); + setPalette(newPalette); + + setAcceptDrops(true); + setMinimumSize(400, qMax(200, y)); + setWindowTitle(tr("Draggable Text")); +} + +void DragWidget::dragEnterEvent(QDragEnterEvent *event) +{ + if (event->mimeData()->hasText()) { + if (event->source() == this) { + event->setDropAction(Qt::MoveAction); + event->accept(); + } else { + event->acceptProposedAction(); + } + } else { + event->ignore(); + } +} + +void DragWidget::dropEvent(QDropEvent *event) +{ + if (event->mimeData()->hasText()) { + const QMimeData *mime = event->mimeData(); + QStringList pieces = mime->text().split(QRegExp("\\s+"), + QString::SkipEmptyParts); + QPoint position = event->pos(); + QPoint hotSpot; + + QList<QByteArray> hotSpotPos = mime->data("application/x-hotspot").split(' '); + if (hotSpotPos.size() == 2) { + hotSpot.setX(hotSpotPos.first().toInt()); + hotSpot.setY(hotSpotPos.last().toInt()); + } + + foreach (QString piece, pieces) { + DragLabel *newLabel = new DragLabel(piece, this); + newLabel->move(position - hotSpot); + newLabel->show(); + newLabel->setAttribute(Qt::WA_DeleteOnClose); + + position += QPoint(newLabel->width(), 0); + } + + if (event->source() == this) { + event->setDropAction(Qt::MoveAction); + event->accept(); + } else { + event->acceptProposedAction(); + } + } else { + event->ignore(); + } + foreach (QObject *child, children()) { + if (child->inherits("QWidget")) { + QWidget *widget = static_cast<QWidget *>(child); + if (!widget->isVisible()) + widget->deleteLater(); + } + } +} + +void DragWidget::mousePressEvent(QMouseEvent *event) +{ + QLabel *child = static_cast<QLabel*>(childAt(event->pos())); + if (!child) + return; + + QPoint hotSpot = event->pos() - child->pos(); + + QMimeData *mimeData = new QMimeData; + mimeData->setText(child->text()); + mimeData->setData("application/x-hotspot", + QByteArray::number(hotSpot.x()) + + " " + QByteArray::number(hotSpot.y())); + + QPixmap pixmap(child->size()); + child->render(&pixmap); + + QDrag *drag = new QDrag(this); + drag->setMimeData(mimeData); + drag->setPixmap(pixmap); + drag->setHotSpot(hotSpot); + + Qt::DropAction dropAction = drag->exec(Qt::CopyAction | Qt::MoveAction, Qt::CopyAction); + + if (dropAction == Qt::MoveAction) + child->close(); +} |