pyqt - put color in a QTableView with existing dat

问题:

i need help to color my QTableView. @rainer helped me putting color when i initialize a table, but now, i already have a table with data(but without color// my data is a csv opened in my table), and i want to create a button that when clicked it colors the tableview in some lines, like when there is a row with -2 (data), it will be color with blue color.. -- I have a button and a table. This button load the csv data into my tableview. I want to have a new button that color the rows of this table. ( but color only rows that have -2 of data, for example) Some codes:

    self.fileName = (_fromUtf8('tweets.csv'))
    self.tableView = QTableView(self.tabSentimento)
    self.tableView.setGeometry(QRect(550,10,510,700))
    self.tableView.setObjectName(_fromUtf8("TabelaSentimento"))
    self.tableView.setModel(self.model)
    self.tableView.horizontalHeader().setStretchLastSection(True)

    self.pushButtonLoad = QPushButton(self.tabSentimento)
    self.pushButtonLoad.setGeometry(QRect(550,720,130,30))
    self.pushButtonLoad.setObjectName(_fromUtf8("buttonLoadCSV"))
    self.pushButtonLoad.setText(QApplication.translate("Form", "Process!", None, QApplication.UnicodeUTF8))
    self.pushButtonLoad.setStyleSheet('color:red;background-color:rgb(255, 255, 153);border:1px solid purple;')
    self.pushButtonLoad.clicked.connect(self.on_pushButtonLoad_clicked)


    def loadCsv(self, fileName):
        with open(fileName, "rb") as fileInput:
            for row in csv.reader(fileInput):    
                items = [
                    QStandardItem(field)
                    for field in row
            ]
                self.model.appendRow(items)

    def on_pushButtonLoad_clicked(self):
        print self.fileName
        self.loadCsv(self.fileName)

回答1:

You could for example subclass the model and reimplement the data method, this code example will change the cells background color to blue if the pushButtonColorize is checked and the value of the cell is equal to 1. It will also affect cells in the same row.

#!/usr/bin/env python
#-*- coding:utf-8 -*-

import sip
sip.setapi('QString', 2)
sip.setapi('QVariant', 2)

import random
from PyQt4 import QtGui, QtCore

class MyStandardItemModel(QtGui.QStandardItemModel):
    _colorize = False
    def __init__(self, parent=None):
        super(MyStandardItemModel, self).__init__(parent)

    def setColorized(self, state):
        self._colorize = state

    def data(self, index, role=QtCore.Qt.DisplayRole):
        if role == QtCore.Qt.BackgroundColorRole \
        and not self._colorize:
            return QtGui.QBrush()

        return super(MyStandardItemModel, self).data(index, role)

class MyWindow(QtGui.QWidget):
    def __init__(self, parent=None):
        super(MyWindow, self).__init__(parent)

        self.pushButtonColorize = QtGui.QPushButton(self)
        self.pushButtonColorize.setText("Colorize Cells!")
        self.pushButtonColorize.setCheckable(True)
        self.pushButtonColorize.toggled.connect(self.on_pushButtonColorize_toggled)

        self.pushButtonReload = QtGui.QPushButton(self)
        self.pushButtonReload.setText("Reload Data!")
        self.pushButtonReload.clicked.connect(self.on_pushButtonReload_clicked)

        self.modelSource = MyStandardItemModel(self)

        self.tableView = QtGui.QTableView(self)
        self.tableView.horizontalHeader().setStretchLastSection(True)
        self.tableView.setModel(self.modelSource)

        self.layoutVertical = QtGui.QVBoxLayout(self)
        self.layoutVertical.addWidget(self.pushButtonReload)
        self.layoutVertical.addWidget(self.pushButtonColorize)
        self.layoutVertical.addWidget(self.tableView)

        self.pushButtonReload.click()

    @QtCore.pyqtSlot()
    def on_pushButtonReload_clicked(self):
        self.modelSource.clear()

        for rowNumber in range(3):
            items = []
            for columnNumber in range(3):
                item = QtGui.QStandardItem()
                item.setText(str(random.getrandbits(1)))

                items.append(item)

            self.modelSource.appendRow(items)

        if self.pushButtonColorize.isChecked():
            self.on_pushButtonColorize_toggled(True)

    @QtCore.pyqtSlot(bool)
    def on_pushButtonColorize_toggled(self, state):
        self.modelSource.setColorized(state)

        rowCount    = self.modelSource.rowCount()
        columnCount = self.modelSource.columnCount()

        for rowNumber in range(rowCount):
            for columnNumber in range(columnCount):
                cellIndex = self.modelSource.index(rowNumber, columnNumber)
                cellData  = self.modelSource.data(cellIndex, QtCore.Qt.DisplayRole)

                if str(cellData).isdigit() \
                and int(cellData) == 1:
                    for cellColumn in range(columnCount):
                        self.modelSource.setData(
                            self.modelSource.index(rowNumber, cellColumn),
                            QtGui.QColor(QtCore.Qt.blue),
                            QtCore.Qt.BackgroundColorRole
                        )

        self.modelSource.endResetModel()

if __name__ == "__main__":
    import sys

    app = QtGui.QApplication(sys.argv)
    app.setApplicationName('MyWindow')

    main = MyWindow()
    main.resize(333, 222)
    main.show()

    sys.exit(app.exec_())