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Viewing changes to openlp/core/lib/listwidgetwithdnd.py

  • Committer: Simon Hanna
  • Date: 2016-05-17 08:48:19 UTC
  • mfrom: (2625.1.36 openlp)
  • mto: (2625.1.37 openlp)
  • mto: This revision was merged to the branch mainline in revision 2649.
  • Revision ID: simon.hanna@serve-me.info-20160517084819-lgup78nzyzjympuu
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openlp/core/lib/listwidgetwithdnd.py
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# -*- coding: utf-8 -*-
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# vim: autoindent shiftwidth=4 expandtab textwidth=120 tabstop=4 softtabstop=4
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###############################################################################
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# OpenLP - Open Source Lyrics Projection                                      #
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# --------------------------------------------------------------------------- #
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# Copyright (c) 2008-2016 OpenLP Developers                                   #
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# --------------------------------------------------------------------------- #
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# This program is free software; you can redistribute it and/or modify it     #
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# under the terms of the GNU General Public License as published by the Free  #
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# Software Foundation; version 2 of the License.                              #
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#                                                                             #
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# This program is distributed in the hope that it will be useful, but WITHOUT #
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or       #
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# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for    #
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# more details.                                                               #
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#                                                                             #
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# You should have received a copy of the GNU General Public License along     #
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# with this program; if not, write to the Free Software Foundation, Inc., 59  #
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# Temple Place, Suite 330, Boston, MA 02111-1307 USA                          #
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###############################################################################
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"""
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Extend QListWidget to handle drag and drop functionality
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"""
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import os
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from PyQt5 import QtCore, QtGui, QtWidgets
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from openlp.core.common import Registry
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class ListWidgetWithDnD(QtWidgets.QListWidget):
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    """
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    Provide a list widget to store objects and handle drag and drop events
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    """
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    def __init__(self, parent=None, name=''):
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        """
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        Initialise the list widget
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        """
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        super(ListWidgetWithDnD, self).__init__(parent)
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        self.mime_data_text = name
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    def activateDnD(self):
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        """
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        Activate DnD of widget
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        """
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        self.setAcceptDrops(True)
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        self.setDragDropMode(QtWidgets.QAbstractItemView.DragDrop)
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        Registry().register_function(('%s_dnd' % self.mime_data_text), self.parent().load_file)
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    def mouseMoveEvent(self, event):
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        """
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        Drag and drop event does not care what data is selected as the recipient will use events to request the data
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        move just tell it what plugin to call
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        """
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        if event.buttons() != QtCore.Qt.LeftButton:
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            event.ignore()
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            return
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        if not self.selectedItems():
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            event.ignore()
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            return
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        drag = QtGui.QDrag(self)
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        mime_data = QtCore.QMimeData()
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        drag.setMimeData(mime_data)
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        mime_data.setText(self.mime_data_text)
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        drag.exec(QtCore.Qt.CopyAction)
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    def dragEnterEvent(self, event):
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        """
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        When something is dragged into this object, check if you should be able to drop it in here.
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        """
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        if event.mimeData().hasUrls():
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            event.accept()
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        else:
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            event.ignore()
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    def dragMoveEvent(self, event):
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        """
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        Make an object droppable, and set it to copy the contents of the object, not move it.
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        """
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        if event.mimeData().hasUrls():
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            event.setDropAction(QtCore.Qt.CopyAction)
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            event.accept()
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        else:
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            event.ignore()
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    def dropEvent(self, event):
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        """
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        Receive drop event check if it is a file and process it if it is.
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        :param event:  Handle of the event pint passed
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        """
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        if event.mimeData().hasUrls():
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            event.setDropAction(QtCore.Qt.CopyAction)
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            event.accept()
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            files = []
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            for url in event.mimeData().urls():
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                local_file = os.path.normpath(url.toLocalFile())
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                if os.path.isfile(local_file):
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                    files.append(local_file)
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                elif os.path.isdir(local_file):
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                    listing = os.listdir(local_file)
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                    for file in listing:
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                        files.append(os.path.join(local_file, file))
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            Registry().execute('%s_dnd' % self.mime_data_text, {'files': files, 'target': self.itemAt(event.pos())})
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        else:
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            event.ignore()