Code for Fridge Magnets Example
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package com.trolltech.examples;
import com.trolltech.qt.core.*;
import com.trolltech.qt.gui.*;
@QtJambiExample(name = "Drag and Drop")
public class FridgeMagnets extends QWidget {
public static void main(String args[]) {
QApplication.initialize(args);
FridgeMagnets fridgeMagnets = new FridgeMagnets(null);
fridgeMagnets.show();
QApplication.exec();
}
public FridgeMagnets(QWidget parent) {
super(parent);
QFile dictionaryFile;
dictionaryFile = new QFile("classpath:com/trolltech/examples/words.txt");
dictionaryFile.open(QIODevice.OpenModeFlag.ReadOnly);
QTextStream inputStream = new QTextStream(dictionaryFile);
int x = 5;
int y = 5;
while (!inputStream.atEnd()) {
String word = "";
word = inputStream.readLine();
if (!word.equals("")) {
DragLabel wordLabel = new DragLabel(word, this);
wordLabel.move(x, y);
wordLabel.show();
x += wordLabel.sizeHint().width() + 2;
if (x >= 245) {
x = 5;
y += wordLabel.sizeHint().height() + 2;
}
}
}
inputStream.dispose();
dictionaryFile.dispose();
QPalette newPalette = palette();
newPalette.setColor(QPalette.ColorRole.Window, QColor.white);
setPalette(newPalette);
setMinimumSize(400, Math.max(200, y));
setWindowIcon(new QIcon("classpath:com/trolltech/images/qt-logo.png"));
setWindowTitle(tr("Fridge Magnets"));
setAcceptDrops(true);
}
@Override
public void dragEnterEvent(QDragEnterEvent event) {
if (event.mimeData().hasFormat("application/x-fridgemagnet")) {
if (children().contains(event.source())) {
event.setDropAction(Qt.DropAction.MoveAction);
event.accept();
} else {
event.acceptProposedAction();
}
} else if (event.mimeData().hasText()) {
event.acceptProposedAction();
} else {
event.ignore();
}
}
@Override
public void dragMoveEvent(QDragMoveEvent event) {
if (event.mimeData().hasFormat("application/x-fridgemagnet")) {
if (children().contains(event.source())) {
event.setDropAction(Qt.DropAction.MoveAction);
event.accept();
} else {
event.acceptProposedAction();
}
} else if (event.mimeData().hasText()) {
event.acceptProposedAction();
} else {
event.ignore();
}
}
@Override
public void dropEvent(QDropEvent event) {
if (event.mimeData().hasFormat("application/x-fridgemagnet")) {
com.trolltech.qt.core.QMimeData mime = event.mimeData();
QByteArray itemData = mime.data("application/x-fridgemagnet");
QDataStream dataStream = new QDataStream(itemData,
new QIODevice.OpenMode(QIODevice.OpenModeFlag.ReadOnly));
String text = dataStream.readString();
QPoint offset = new QPoint();
offset.readFrom(dataStream);
DragLabel newLabel = new DragLabel(text, this);
newLabel.move(new QPoint(event.pos().x() - offset.x(),
event.pos().y() - offset.y()));
newLabel.show();
if (children().contains(event.source())) {
event.setDropAction(Qt.DropAction.MoveAction);
event.accept();
} else {
event.acceptProposedAction();
}
} else if (event.mimeData().hasText()) {
String[] pieces = event.mimeData().text().split("\\s+");
QPoint position = event.pos();
for (String piece : pieces) {
if (piece.equals(""))
continue;
DragLabel newLabel = new DragLabel(piece, this);
newLabel.move(position);
newLabel.show();
position.add(new QPoint(newLabel.width(), 0));
}
event.acceptProposedAction();
} else {
event.ignore();
}
}
class DragLabel extends QLabel {
private String labelText;
public DragLabel(final String text, QWidget parent) {
super(parent);
QFontMetrics metrics = new QFontMetrics(font());
QSize size = metrics.size(12, text);
QImage image = new QImage(size.width() + 12, size.height() + 12,
QImage.Format.Format_ARGB32_Premultiplied);
image.fill(0);
QFont font = new QFont();
font.setStyleStrategy(QFont.StyleStrategy.ForceOutline);
QPainter painter = new QPainter();
painter.begin(image);
painter.setRenderHint(QPainter.RenderHint.Antialiasing);
painter.setBrush(QColor.white);
QRectF frame = new QRectF(0.5, 0.5, image.width() - 1,
image.height() - 1);
painter.drawRoundRect(frame, 10 * 100 / image.width(), 10 * 100 / image.height());
painter.setFont(font);
painter.setBrush(QColor.black);
QRect rectangle = new QRect(new QPoint(6, 6), size);
painter.drawText(rectangle, Qt.AlignmentFlag.AlignCenter.value(),
text);
painter.end();
setPixmap(QPixmap.fromImage(image));
labelText = text;
}
@Override
public void mousePressEvent(QMouseEvent event) {
QByteArray itemData = new QByteArray();
QDataStream dataStream;
dataStream = new QDataStream(itemData,
new QIODevice.OpenMode(QIODevice.OpenModeFlag.WriteOnly));
dataStream.writeString(labelText);
QPoint position = new QPoint(event.pos().x() - rect().topLeft().x(),
event.pos().y() - rect().topLeft().y());
position.writeTo(dataStream);
com.trolltech.qt.core.QMimeData mimeData = new com.trolltech.qt.core.QMimeData();
mimeData.setData("application/x-fridgemagnet", itemData);
mimeData.setText(labelText);
QDrag drag = new QDrag(this);
drag.setMimeData(mimeData);
drag.setHotSpot(new QPoint(event.pos().x() - rect().topLeft().x(),
event.pos().y() - rect().topLeft().y()));
drag.setPixmap(pixmap());
hide();
if (drag.exec(Qt.DropAction.MoveAction) == Qt.DropAction.MoveAction)
close();
else
show();
}
}
}
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Qt Jambi 4.4.3_01 |