Code for Draggable Icons Example
package com.trolltech.examples;
import com.trolltech.qt.*;
import com.trolltech.qt.core.*;
import com.trolltech.qt.gui.*;
@QtJambiExample(name = "Draggable Icons")
public class DraggableIcons extends QFrame
{
public DraggableIcons()
{
setMinimumSize(200, 200);
setFrameStyle(QFrame.Shadow.Sunken.value() | QFrame.Shape.StyledPanel.value());
setAcceptDrops(true);
QLabel boatIcon = new QLabel(this);
boatIcon.setPixmap(new QPixmap("classpath:com/trolltech/examples/images/boat.png"));
boatIcon.move(20, 20);
QLabel carIcon = new QLabel(this);
carIcon.setPixmap(new QPixmap("classpath:com/trolltech/examples/images/car.png"));
carIcon.move(120, 20);
QLabel houseIcon = new QLabel(this);
houseIcon.setPixmap(new QPixmap("classpath:com/trolltech/examples/images/house.png"));
houseIcon.move(20, 120);
}
protected void dragEnterEvent(QDragEnterEvent event)
{
if (event.mimeData().hasFormat("application/x-dnditemdata")) {
if (event.source().equals(this)) {
event.setDropAction(Qt.DropAction.MoveAction);
event.accept();
} else {
event.acceptProposedAction();
}
} else {
event.ignore();
}
}
protected void dragMoveEvent(QDragMoveEvent event)
{
if (event.mimeData().hasFormat("application/x-dnditemdata")) {
if (event.source().equals(this)) {
event.setDropAction(Qt.DropAction.MoveAction);
event.accept();
} else {
event.acceptProposedAction();
}
} else {
event.ignore();
}
}
protected void dropEvent(QDropEvent event)
{
if (event.mimeData().hasFormat("application/x-dnditemdata")) {
QByteArray itemData = event.mimeData().data("application/x-dnditemdata");
QDataStream dataStream = new QDataStream(itemData, QIODevice.OpenModeFlag.ReadOnly);
QPixmap pixmap = new QPixmap();
QPoint offset = new QPoint();
pixmap.readFrom(dataStream);
offset.readFrom(dataStream);
QLabel newIcon = new QLabel(this);
newIcon.setPixmap(pixmap);
newIcon.move(event.pos().subtract(offset));
newIcon.show();
newIcon.setAttribute(Qt.WidgetAttribute.WA_DeleteOnClose);
if (event.source().equals(this)) {
event.setDropAction(Qt.DropAction.MoveAction);
event.accept();
} else {
event.acceptProposedAction();
}
} else {
event.ignore();
}
}
protected void mousePressEvent(QMouseEvent event)
{
QLabel child = (QLabel) childAt(event.pos());
if (child == null)
return;
QPixmap pixmap = child.pixmap();
QByteArray itemData = new QByteArray();
QDataStream dataStream = new QDataStream(itemData, QIODevice.OpenModeFlag.WriteOnly);
pixmap.writeTo(dataStream);
event.pos().subtract(child.pos()).writeTo(dataStream);
com.trolltech.qt.core.QMimeData mimeData = new com.trolltech.qt.core.QMimeData();
mimeData.setData("application/x-dnditemdata", itemData);
QDrag drag = new QDrag(this);
drag.setMimeData(mimeData);
drag.setPixmap(pixmap);
drag.setHotSpot(event.pos().subtract(child.pos()));
QPixmap tempPixmap = new QPixmap(pixmap);
QPainter painter = new QPainter();
painter.begin(tempPixmap);
painter.fillRect(pixmap.rect(), new QBrush(new QColor(127, 127, 127, 127)));
painter.end();
child.setPixmap(tempPixmap);
if (drag.exec(new Qt.DropActions(Qt.DropAction.CopyAction,
Qt.DropAction.MoveAction, Qt.DropAction.CopyAction)) == Qt.DropAction.MoveAction)
child.close();
else {
child.show();
child.setPixmap(pixmap);
}
}
public static void main(String args[])
{
QApplication.initialize(args);
QWidget mainWidget = new QWidget();
QHBoxLayout horizontalLayout = new QHBoxLayout();
horizontalLayout.addWidget(new DraggableIcons());
horizontalLayout.addWidget(new DraggableIcons());
mainWidget.setLayout(horizontalLayout);
mainWidget.setWindowTitle("Draggable Icons");
mainWidget.show();
QApplication.exec();
}
}