[PyQt] FetchMore Example - Table Edition
Hello Everyone, The last time I wrote in I had presented the FetchMore example. I've extended this example to use a simple table model. The input is a 2d numpy array. I couldn't find an example with lazy table population anywhere, so here's what I've got. Feel free to use it as you wish. Hope that someone finds it useful. Regards, Darryl -- __ Darryl Wallace: Project Leader ProSensus Inc. McMaster Innovation Park 175 Longwood Road South Hamilton, Ontario, L8P 0A1 Canada(GMT -05:00) Tel: 1-905-528-9136 Fax: 1-905-546-1372 Web site: http://www.prosensus.ca/ __ # Fetch More Example - Lazy Table Edition # Ported to PyQt4 by Darryl Wallace, 2009 - walla...@gmail.com import sys from PyQt4 import QtGui, QtCore import numpy class LazyTableModel(QtCore.QAbstractTableModel): def __init__(self, data, parent=None): QtCore.QAbstractTableModel.__init__(self, parent) self.numRows=0 self.numColumns=0 self._data=data #__init__ def rowCount(self, parent): parent=QModelIndex return self.numRows #rowCount def columnCount(self, parent): parent=QModelIndex return self.numColumns #columnCount def data(self, index, role=QtCore.Qt.DisplayRole): index=QModelIndex if not index.isValid(): return QtCore.QVariant() if index.row()=self.numRows or index.row()0 or index.column()=self.numColumns or index.column()0: return QtCore.QVariant() if role==QtCore.Qt.DisplayRole: return QtCore.QVariant(self._data[index.row(), index.column()]) elif role==QtCore.Qt.BackgroundRole: return QtCore.QVariant(QtGui.qApp.palette().base()) return QtCore.QVariant() #data def canFetchMore(self, index): index=QModelIndex if self.numRowsself._data.shape[0] or self.numColumnsself._data.shape[1]: return True else: return False #canFetchMore def fetchMore(self, index): Index=QModelIndex maxFetch=10 #maximum number of rows/columns to grab at a time. remainderRows=self._data.shape[0]-self.numRows rowsToFetch=min(maxFetch, remainderRows) if rowsToFetch0: self.beginInsertRows(QtCore.QModelIndex(), self.numRows, self.numRows+rowsToFetch-1) self.endInsertRows() self.numRows+=rowsToFetch remainderColumns=self._data.shape[1]-self.numColumns columnsToFetch=min(maxFetch, remainderColumns) if columnsToFetch0: self.beginInsertColumns(QtCore.QModelIndex(), self.numColumns, self.numColumns+columnsToFetch-1) self.endInsertColumns() self.numColumns+=columnsToFetch self.emit(QtCore.SIGNAL(numberPopulated), rowsToFetch, columnsToFetch) #fetchMore #LazyTableModel class Window(QtGui.QWidget): def __init__(self, data, parent=None): Data is any 2-d numpy array QtGui.QWidget.__init__(self, parent) self.model = LazyTableModel(data, parent=self) view=QtGui.QTableView() view.setModel(self.model) self.logViewer=QtGui.QTextBrowser() self.logViewer.setSizePolicy(QtGui.QSizePolicy(QtGui.QSizePolicy.Preferred, QtGui.QSizePolicy.Preferred)) self.connect(self.model, QtCore.SIGNAL(numberPopulated), self.updateLog) layout=QtGui.QGridLayout() layout.addWidget(view, 0, 0, 1, 2) layout.addWidget(self.logViewer, 1, 0, 1, 2) self.setLayout(layout) self.setWindowTitle(self.tr(Fetch More Example - Table Edition)) self.resize(400, 600) #__init__ def updateLog(self, rows, columns): self.logViewer.append(self.tr(%1 rows added. %2 columns added).arg(rows).arg(columns)) #updateLog #Window if __name__=='__main__': qApp=QtGui.QApplication(sys.argv) data=numpy.random.normal(size=(117, 53)) fetchMoreWindow=Window(data) fetchMoreWindow.show() qApp.exec_() ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
[PyQt] FetchMore Example
Hello Everyone, Since I was interested in the FetchMore example (included in Qt4.5) and extending it for myself, I just decided to port the FetchMore example to PyQt4 since I noticed it was not included in the ItemViews examples in the latest snapshot. Feel free to use it as you wish. Phil feel free to included it in your list of examples should it be deemed acceptable. The only thing that I have done differently is that I force the QStringList to be a Python list. I wrote it using PyQt4.4.2 in Linux (Ubuntu). See the attached file. Regards, Darryl # Fetch More Example # Ported to PyQt4 by Darryl Wallace, 2009 - walla...@gmail.com import sys from PyQt4 import QtGui, QtCore class FileListModel(QtCore.QAbstractListModel): def __init__(self, parent=None): QtCore.QAbstractListModel.__init__(self, parent) self.fileCount=0 self.fileList=[]#initialize the file list as a Python list. #__init__ def rowCount(self, parent): parent=QModelIndex return self.fileCount #rowCount def data(self, index, role=QtCore.Qt.DisplayRole): index=QModelIndex if not index.isValid(): return QtCore.QVariant() if index.row()=len(self.fileList) or index.row()0: return QtCore.QVariant() if role==QtCore.Qt.DisplayRole: return QtCore.QVariant(self.fileList[index.row()]) elif role==QtCore.Qt.BackgroundRole: batch=(index.row()/100)%2 if batch==0: return QtCore.QVariant(QtGui.qApp.palette().base()) else: return QtCore.QVariant(QtGui.qApp.palette().alternateBase()) return QtCore.QVariant() #data def canFetchMore(self, index): index=QModelIndex if self.fileCountlen(self.fileList): return True else: return False #canFetchMore def fetchMore(self, index): Index=QModelIndex 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.emit(QtCore.SIGNAL(numberPopulated), itemsToFetch) #fetchMore def setDirPath(self, path): dir=QtCore.QDir(path) self.fileList=list(dir.entryList()) # force Python list. self.fileCount=0 self.reset() #setDirPath #FileListModel class Window(QtGui.QWidget): def __init__(self, parent=None): QtGui.QWidget.__init__(self, parent) self.model = FileListModel(self) self.model.setDirPath(QtCore.QLibraryInfo.location(QtCore.QLibraryInfo.PrefixPath)) label = QtGui.QLabel(self.tr(Directory)) lineEdit=QtGui.QLineEdit() label.setBuddy(lineEdit) view=QtGui.QListView() view.setModel(self.model) self.logViewer=QtGui.QTextBrowser() self.logViewer.setSizePolicy(QtGui.QSizePolicy(QtGui.QSizePolicy.Preferred, QtGui.QSizePolicy.Preferred)) self.connect(lineEdit, QtCore.SIGNAL(textChanged(const QString )), self.model.setDirPath) self.connect(lineEdit, QtCore.SIGNAL(textChanged(const QString )), self.logViewer, QtCore.SLOT(clear())) self.connect(self.model, QtCore.SIGNAL(numberPopulated), 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(self.tr(Fetch More Example)) #__init__ def updateLog(self, number): self.logViewer.append(self.tr(%1 items added.).arg(number)) #updateLog #Window if __name__=='__main__': qApp=QtGui.QApplication(sys.argv) fetchMoreWindow=Window() fetchMoreWindow.show() sys.exit(qApp.exec_()) ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
Re: [PyQt] FetchMore Example
I really appreciate that kind of simple examples. This is the best way to learn how to use PyQt. Thanks a lot. Christophe Darryl Wallace a écrit : Hello Everyone, Since I was interested in the FetchMore example (included in Qt4.5) and extending it for myself, I just decided to port the FetchMore example to PyQt4 since I noticed it was not included in the ItemViews examples in the latest snapshot. Feel free to use it as you wish. Phil feel free to included it in your list of examples should it be deemed acceptable. The only thing that I have done differently is that I force the QStringList to be a Python list. I wrote it using PyQt4.4.2 in Linux (Ubuntu). See the attached file. Regards, Darryl ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
