onionshare/onionshare_gui/file_selection.py

"""
OnionShare | https://onionshare.org/

Copyright (C) 2014 Micah Lee <micah@micahflee.com>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
"""
import os
from PyQt4 import QtCore, QtGui

import common
from onionshare import strings, helpers

class FileList(QtGui.QListWidget):
    files_dropped = QtCore.pyqtSignal()
    files_updated = QtCore.pyqtSignal()

    def __init__(self, parent=None):
        super(FileList, self).__init__(parent)
        self.setAcceptDrops(True)
        self.setIconSize(QtCore.QSize(32, 32))
        self.setSortingEnabled(True)

        # drag and drop label
        self.drop_label = QtGui.QLabel(QtCore.QString(strings._('gui_drag_and_drop')), parent=self)
        self.drop_label.setAlignment(QtCore.Qt.AlignCenter)
        self.drop_label.setStyleSheet('background: url({0}/drop_files.png) no-repeat center center; color: #999999;'.format(common.onionshare_gui_dir))
        self.drop_label.hide()

        self.filenames = []
        self.update()

    def update(self):
        # file list should have a background image if empty
        if len(self.filenames) == 0:
            self.drop_label.show()
        else:
            self.drop_label.hide()

    def resizeEvent(self, event):
        self.drop_label.setGeometry(0, 0, self.width(), self.height())

    def dragEnterEvent(self, event):
        if event.mimeData().hasUrls:
            event.accept()
        else:
            event.ignore()

    def dragMoveEvent(self, event):
        if event.mimeData().hasUrls:
            event.setDropAction(QtCore.Qt.CopyAction)
            event.accept()
        else:
            event.ignore()

    def dropEvent(self, event):
        if event.mimeData().hasUrls:
            event.setDropAction(QtCore.Qt.CopyAction)
            event.accept()
            for url in event.mimeData().urls():
                filename = str(url.toLocalFile())
                self.add_file(filename)
        else:
            event.ignore()
        self.files_dropped.emit()

    def add_file(self, filename):
        if filename not in self.filenames:
            self.filenames.append(filename)

            basename = os.path.basename(filename)
            fileinfo = QtCore.QFileInfo(filename)
            ip = QtGui.QFileIconProvider()
            icon = ip.icon(fileinfo)

            if os.path.isfile(filename):
                size = self.human_readable_filesize(fileinfo.size())
            else:
                size = self.human_readable_filesize(helpers.dir_size(filename))
            item = QtGui.QListWidgetItem('{0} ({1})'.format(basename, size))
            item.setToolTip(QtCore.QString(size))
            
            item.setIcon(icon)
            self.addItem(item)

            self.files_updated.emit()

    def human_readable_filesize(self, b):
        thresh = 1024.0
        if b < thresh:
            return '{0} B'.format(b)
        units = ['KiB','MiB','GiB','TiB','PiB','EiB','ZiB','YiB']
        u = 0
        b /= thresh
        while b >= thresh:
            b /= thresh
            u += 1
        return '{0} {1}'.format(round(b, 1), units[u])

class FileSelection(QtGui.QVBoxLayout):
    def __init__(self):
        super(FileSelection, self).__init__()
        self.server_on = False

        # file list
        self.file_list = FileList()
        self.file_list.currentItemChanged.connect(self.update)
        self.file_list.files_dropped.connect(self.update)

        # buttons
        self.add_files_button = QtGui.QPushButton(strings._('gui_add_files'))
        self.add_files_button.clicked.connect(self.add_files)
        self.add_dir_button = QtGui.QPushButton(strings._('gui_add_folder'))
        self.add_dir_button.clicked.connect(self.add_dir)
        self.delete_button = QtGui.QPushButton(strings._('gui_delete'))
        self.delete_button.clicked.connect(self.delete_file)
        button_layout = QtGui.QHBoxLayout()
        button_layout.addWidget(self.add_files_button)
        button_layout.addWidget(self.add_dir_button)
        button_layout.addWidget(self.delete_button)

        # add the widgets
        self.addWidget(self.file_list)
        self.addLayout(button_layout)

        self.update()

    def update(self):
        # all buttons should be disabled if the server is on
        if self.server_on:
            self.add_files_button.setEnabled(False)
            self.add_dir_button.setEnabled(False)
            self.delete_button.setEnabled(False)
        else:
            self.add_files_button.setEnabled(True)
            self.add_dir_button.setEnabled(True)

            # delete button should be disabled if item isn't selected
            current_item = self.file_list.currentItem()
            if not current_item:
                self.delete_button.setEnabled(False)
            else:
                self.delete_button.setEnabled(True)

        # update the file list
        self.file_list.update()

    def add_files(self):
        filenames = QtGui.QFileDialog.getOpenFileNames(caption=strings._('gui_choose_files'), options=QtGui.QFileDialog.ReadOnly)
        if filenames:
            for filename in filenames:
                self.file_list.add_file(str(filename))
        self.update()

    def add_dir(self):
        filename = QtGui.QFileDialog.getExistingDirectory(caption=strings._('gui_choose_folder'), options=QtGui.QFileDialog.ReadOnly)
        if filename:
            self.file_list.add_file(str(filename))
        self.update()

    def delete_file(self):
        current_row = self.file_list.currentRow()
        self.file_list.filenames.pop(current_row)
        self.file_list.takeItem(current_row)
        self.update()

    def server_started(self):
        self.server_on = True
        self.file_list.setAcceptDrops(False)
        self.update()
    
    def server_stopped(self):
        self.server_on = False
        self.file_list.setAcceptDrops(True)
        self.update()

    def get_num_files(self):
        return len(self.file_list.filenames)