dragwidget.cpp

奇趣公司比较新的qt/emd版本

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#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();
            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 (children().contains(event->source())) {
            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();

            position += QPoint(newLabel->width(), 0);
        }

        if (children().contains(event->source())) {
            event->setDropAction(Qt::MoveAction);
            event->accept();
        } else {
            event->acceptProposedAction();
        }
    } else {
        event->ignore();
    }
}