#!/usr/bin/env python
 
 
#############################################################################
##
## Copyright (C) 2013 Riverbank Computing Limited.
## Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
## All rights reserved.
##
## This file is part of the examples of PyQt.
##
## $QT_BEGIN_LICENSE:BSD$
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##   * Redistributions of source code must retain the above copyright
##     notice, this list of conditions and the following disclaimer.
##   * Redistributions in binary form must reproduce the above copyright
##     notice, this list of conditions and the following disclaimer in
##     the documentation and/or other materials provided with the
##     distribution.
##   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
##     the names of its contributors may be used to endorse or promote
##     products derived from this software without specific prior written
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## $QT_END_LICENSE$
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#############################################################################
 
 
from PyQt5.QtCore import (QByteArray, QDataStream, QIODevice, QMimeData,
        QPoint, Qt)
from PyQt5.QtGui import QColor, QDrag, QPainter, QPixmap
from PyQt5.QtWidgets import QApplication, QFrame, QHBoxLayout, QLabel, QWidget
 
import draggableicons_rc
 
 
class DragWidget(QFrame):
    def __init__(self, parent=None):
        super(DragWidget, self).__init__(parent)
 
        self.setMinimumSize(200, 200)
        self.setFrameStyle(QFrame.Sunken | QFrame.StyledPanel)
        self.setAcceptDrops(True)
 
        boatIcon = QLabel(self)
        boatIcon.setPixmap(QPixmap(':/images/boat.png'))
        boatIcon.move(20, 20)
        boatIcon.show()
        boatIcon.setAttribute(Qt.WA_DeleteOnClose)
 
        carIcon = QLabel(self)
        carIcon.setPixmap(QPixmap(':/images/car.png'))
        carIcon.move(120, 20)
        carIcon.show()
        carIcon.setAttribute(Qt.WA_DeleteOnClose)
 
        houseIcon = QLabel(self)
        houseIcon.setPixmap(QPixmap(':/images/house.png'))
        houseIcon.move(20, 120)
        houseIcon.show()
        houseIcon.setAttribute(Qt.WA_DeleteOnClose)
 
    def dragEnterEvent(self, event):
        if event.mimeData().hasFormat('application/x-dnditemdata'):
            if event.source() == self:
                event.setDropAction(Qt.MoveAction)
                event.accept()
            else:
                event.acceptProposedAction()
        else:
            event.ignore()
 
    dragMoveEvent = dragEnterEvent
 
    def dropEvent(self, event):
        if event.mimeData().hasFormat('application/x-dnditemdata'):
            itemData = event.mimeData().data('application/x-dnditemdata')
            dataStream = QDataStream(itemData, QIODevice.ReadOnly)
 
            pixmap = QPixmap()
            offset = QPoint()
            dataStream >> pixmap >> offset
 
            newIcon = QLabel(self)
            newIcon.setPixmap(pixmap)
            newIcon.move(event.pos() - offset)
            newIcon.show()
            newIcon.setAttribute(Qt.WA_DeleteOnClose)
 
            if event.source() == self:
                event.setDropAction(Qt.MoveAction)
                event.accept()
            else:
                event.acceptProposedAction()
        else:
            event.ignore()
 
    def mousePressEvent(self, event):
        child = self.childAt(event.pos())
        if not child:
            return
 
        pixmap = QPixmap(child.pixmap())
 
        itemData = QByteArray()
        dataStream = QDataStream(itemData, QIODevice.WriteOnly)
        dataStream << pixmap << QPoint(event.pos() - child.pos())
 
        mimeData = QMimeData()
        mimeData.setData('application/x-dnditemdata', itemData)
 
        drag = QDrag(self)
        drag.setMimeData(mimeData)
        drag.setPixmap(pixmap)
        drag.setHotSpot(event.pos() - child.pos())
 
        tempPixmap = QPixmap(pixmap)
        painter = QPainter()
        painter.begin(tempPixmap)
        painter.fillRect(pixmap.rect(), QColor(127, 127, 127, 127))
        painter.end()
 
        child.setPixmap(tempPixmap)
 
        if drag.exec_(Qt.CopyAction | Qt.MoveAction, Qt.CopyAction) == Qt.MoveAction:
            child.close()
        else:
            child.show()
            child.setPixmap(pixmap)
 
 
if __name__ == '__main__':
 
    import sys
 
    app = QApplication(sys.argv)
 
    mainWidget = QWidget()
    horizontalLayout = QHBoxLayout()
    horizontalLayout.addWidget(DragWidget())
    horizontalLayout.addWidget(DragWidget())
 
    mainWidget.setLayout(horizontalLayout)
    mainWidget.setWindowTitle("Draggable Icons")
    mainWidget.show()
 
    sys.exit(app.exec_())