#!/usr/bin/env python ############################################################################# ## ## Copyright (C) 2010 Darryl Wallace <wallacdj@gmail.com>. ## Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). ## All rights reserved. ## ## This file is part of the examples of PyQt. ## ## $QT_BEGIN_LICENSE:BSD$ ## You may use this file under the terms of the BSD license as follows: ## ## "Redistribution and use in source and binary forms, with or without ## modification, are permitted provided that the following conditions are ## met: ## * 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 ## permission. ## ## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT ## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR ## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT ## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, ## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT ## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, ## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY ## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE ## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." ## $QT_END_LICENSE$ ## ############################################################################# from PyQt4 import QtCore, QtGui class FileListModel(QtCore.QAbstractListModel): numberPopulated = QtCore.pyqtSignal(int) def __init__(self, parent=None): super(FileListModel, self).__init__(parent) self.fileCount = 0 self.fileList = [] def rowCount(self, parent=QtCore.QModelIndex()): return self.fileCount def data(self, index, role=QtCore.Qt.DisplayRole): if not index.isValid(): return None if index.row() >= len(self.fileList) or index.row() < 0: return None if role == QtCore.Qt.DisplayRole: return self.fileList[index.row()] if role == QtCore.Qt.BackgroundRole: batch = (index.row() // 100) % 2 if batch == 0: return QtGui.qApp.palette().base() return QtGui.qApp.palette().alternateBase() return None def canFetchMore(self, index): return self.fileCount < len(self.fileList) def fetchMore(self, index): remainder = len(self.fileList) - self.fileCount itemsToFetch = min(100, remainder) self.beginInsertRows(QtCore.QModelIndex(), self.fileCount, self.fileCount + itemsToFetch) self.fileCount += itemsToFetch self.endInsertRows() self.numberPopulated.emit(itemsToFetch) def setDirPath(self, path): dir = QtCore.QDir(path) self.fileList = list(dir.entryList()) self.fileCount = 0 self.reset() class Window(QtGui.QWidget): def __init__(self, parent=None): super(Window, self).__init__(parent) model = FileListModel(self) model.setDirPath(QtCore.QLibraryInfo.location(QtCore.QLibraryInfo.PrefixPath)) label = QtGui.QLabel("Directory") lineEdit = QtGui.QLineEdit() label.setBuddy(lineEdit) view = QtGui.QListView() view.setModel(model) self.logViewer = QtGui.QTextBrowser() self.logViewer.setSizePolicy(QtGui.QSizePolicy(QtGui.QSizePolicy.Preferred, QtGui.QSizePolicy.Preferred)) lineEdit.textChanged.connect(model.setDirPath) lineEdit.textChanged.connect(self.logViewer.clear) model.numberPopulated.connect(self.updateLog) layout = QtGui.QGridLayout() layout.addWidget(label, 0, 0) layout.addWidget(lineEdit, 0, 1) layout.addWidget(view, 1, 0, 1, 2) layout.addWidget(self.logViewer, 2, 0, 1, 2) self.setLayout(layout) self.setWindowTitle("Fetch More Example") def updateLog(self, number): self.logViewer.append("%d items added." % number) if __name__ == '__main__': import sys app = QtGui.QApplication(sys.argv) window = Window() window.show() sys.exit(app.exec_())