Code for Draggable Text Example
package com.trolltech.examples;
import com.trolltech.qt.*;
import com.trolltech.qt.core.*;
import com.trolltech.qt.gui.*;
@QtJambiExample(name = "Draggable Text")
public class DraggableText extends QWidget
{
public DraggableText()
{
QFile dictionaryFile = new QFile("classpath:com/trolltech/examples/dictionary/words.txt");
dictionaryFile.open(QIODevice.OpenModeFlag.ReadOnly);
QTextStream inputStream = new QTextStream(dictionaryFile);
int x = 5;
int y = 5;
while (!inputStream.atEnd()) {
String word = inputStream.readString();
if (!word.equals("")) {
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.ColorRole.Window, QColor.white);
setPalette(newPalette);
setAcceptDrops(true);
setMinimumSize(400, Math.max(200, y));
setWindowTitle(tr("Draggable Text"));
}
protected void dragEnterEvent(QDragEnterEvent event)
{
if (event.mimeData().hasText()) {
if (children().contains(event.source())) {
event.setDropAction(Qt.DropAction.MoveAction);
event.accept();
} else {
event.acceptProposedAction();
}
} else {
event.ignore();
}
}
protected void dropEvent(QDropEvent event)
{
if (event.mimeData().hasText()) {
com.trolltech.qt.core.QMimeData mime = event.mimeData();
String pieces[] = mime.text().split("\\s+");
QPoint position = event.pos();
QPoint hotSpot = new QPoint();
String hotSpotPos[] = mime.data("application/x-hotspot").toString().split("\\s");
if (hotSpotPos.length == 2) {
hotSpot.setX(Integer.parseInt(hotSpotPos[0]));
hotSpot.setY(Integer.parseInt(hotSpotPos[1]));
}
for (String piece : pieces) {
DragLabel newLabel = new DragLabel(piece, this);
newLabel.move(position.subtract(hotSpot));
newLabel.show();
position.add(new QPoint(newLabel.width(), 0));
}
if (children().contains(event.source())) {
event.setDropAction(Qt.DropAction.MoveAction);
event.accept();
} else {
event.acceptProposedAction();
}
} else {
event.ignore();
}
}
class DragLabel extends QLabel
{
public DragLabel(String text, QWidget parent)
{
super(parent);
setText(text);
setAutoFillBackground(true);
setFrameShape(QFrame.Shape.Panel);
setFrameShadow(QFrame.Shadow.Raised);
}
protected void mousePressEvent(QMouseEvent event)
{
QPoint hotSpot = event.pos();
com.trolltech.qt.core.QMimeData mimeData = new com.trolltech.qt.core.QMimeData();
mimeData.setText(text());
mimeData.setData("application/x-hotspot",
new QByteArray(String.valueOf(hotSpot.x())
+ " " + String.valueOf(hotSpot.y())));
QPixmap pixmap = new QPixmap(size());
render(pixmap);
QDrag drag = new QDrag(this);
drag.setMimeData(mimeData);
drag.setPixmap(pixmap);
drag.setHotSpot(hotSpot);
Qt.DropAction dropAction = drag.exec(
new Qt.DropActions(Qt.DropAction.CopyAction,
Qt.DropAction.MoveAction,
Qt.DropAction.CopyAction));
if (dropAction == Qt.DropAction.MoveAction) {
close();
update();
}
}
}
public static void main(String args[])
{
QApplication.initialize(args);
new DraggableText().show();
QApplication.exec();
}
}