dragwidget.cpp Example File
draganddrop/fridgemagnets/dragwidget.cpp
#include <QtGui>
#include "draglabel.h"
#include "dragwidget.h"
DragWidget::DragWidget(QWidget *parent)
: QWidget(parent)
{
QFile dictionaryFile(":/dictionary/words.txt");
dictionaryFile.open(QFile::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();
x += wordLabel->width() + 2;
if (x >= 245) {
x = 5;
y += wordLabel->height() + 2;
}
}
}
QPalette newPalette = palette();
newPalette.setColor(QPalette::Window, Qt::white);
setPalette(newPalette);
setMinimumSize(400, qMax(200, y));
setWindowTitle(tr("Fridge Magnets"));
setAcceptDrops(true);
}
void DragWidget::dragEnterEvent(QDragEnterEvent *event)
{
if (event->mimeData()->hasFormat("application/x-fridgemagnet")) {
if (children().contains(event->source())) {
event->setDropAction(Qt::MoveAction);
event->accept();
} else {
event->acceptProposedAction();
}
} else if (event->mimeData()->hasText()) {
event->acceptProposedAction();
} else {
event->ignore();
}
}
void DragWidget::dragMoveEvent(QDragMoveEvent *event)
{
if (event->mimeData()->hasFormat("application/x-fridgemagnet")) {
if (children().contains(event->source())) {
event->setDropAction(Qt::MoveAction);
event->accept();
} else {
event->acceptProposedAction();
}
} else if (event->mimeData()->hasText()) {
event->acceptProposedAction();
} else {
event->ignore();
}
}
void DragWidget::dropEvent(QDropEvent *event)
{
if (event->mimeData()->hasFormat("application/x-fridgemagnet")) {
const QMimeData *mime = event->mimeData();
QByteArray itemData = mime->data("application/x-fridgemagnet");
QDataStream dataStream(&itemData, QIODevice::ReadOnly);
QString text;
QPoint offset;
dataStream >> text >> offset;
DragLabel *newLabel = new DragLabel(text, this);
newLabel->move(event->pos() - offset);
newLabel->show();
if (children().contains(event->source())) {
event->setDropAction(Qt::MoveAction);
event->accept();
} else {
event->acceptProposedAction();
}
} else if (event->mimeData()->hasText()) {
QStringList pieces = event->mimeData()->text().split(QRegExp("\\s+"),
QString::SkipEmptyParts);
QPoint position = event->pos();
foreach (QString piece, pieces) {
DragLabel *newLabel = new DragLabel(piece, this);
newLabel->move(position);
newLabel->show();
position += QPoint(newLabel->width(), 0);
}
event->acceptProposedAction();
} else {
event->ignore();
}
}
Copyright © 2008 Nokia Corporation and/or its subsidiary(-ies) |
Trademarks |
Qt 4.4.3 |