###########################################################################
#
# Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
#
# PyQt port in September 2010 by Hans-Peter Jansen <hpj@urpla.net>
#
###########################################################################

from PyQt4 import QtCore, QtGui


class DropArea(QtGui.QLabel):

    changed = QtCore.pyqtSignal(QtCore.QMimeData)

    def __init__(self, parent = None):
        super(DropArea, self).__init__(parent)
        self.setMinimumSize(200, 200)
        self.setFrameStyle(QtGui.QFrame.Sunken | QtGui.QFrame.StyledPanel)
        self.setAlignment(QtCore.Qt.AlignCenter)
        self.setAcceptDrops(True)
        self.setAutoFillBackground(True)
        self.clear()

    def dragEnterEvent(self, event):
        self.setText("<drop content>")
        self.setBackgroundRole(QtGui.QPalette.Highlight)
        event.acceptProposedAction()
        self.changed.emit(event.mimeData())

    def dragMoveEvent(self, event):
        event.acceptProposedAction()

    def dropEvent(self, event):
        mimeData = event.mimeData()
        if mimeData.hasImage():
            self.setPixmap(mimeData.imageData())
        elif mimeData.hasHtml():
            self.setText(mimeData.html())
            self.setTextFormat(QtCore.Qt.RichText)
        elif mimeData.hasText():
            self.setText(mimeData.text())
            self.setTextFormat(QtCore.Qt.PlainText)
        elif mimeData.hasUrls():
            text = QtCore.QString()
            for url in mimeData.urls():
                text += url.path() + "\n"
            self.setText(text)
        else:
            self.setText("Cannot display data")

        self.setBackgroundRole(QtGui.QPalette.Dark)
        event.acceptProposedAction()

    def dragLeaveEvent(self, event):
        self.clear()
        event.accept()

    def clear(self):
        self.setText("<drop content>")
        self.setBackgroundRole(QtGui.QPalette.Dark)
        self.changed.emit(None)