CODEWITHSUNDEEP
pythonpyqtpyqt4
rahul
rahul

Reputation: 58

how to detect editing of text in a cell in a tablewidget in pyqt4?

I have a tablewidget where the rows are added dynamically, I have to enter a name in the first column which is to be specific so I have a listwidget beside tablewidget where names are displayed from a database, so now how to detect the change in the cell so that I can filter out names in listwidget.

I have tried all the signals which are emitted by tablewidget but no luck, all the signals are emitted after a mouse click or keyboard button, I want to detect a change in a single cell for each letter entered or deleted.

I have tried ItemDelegate too, but it detects only the start of editing, here is my code

class ItemDelegate(QtGui.QStyledItemDelegate):
    cellEditingStarted = QtCore.pyqtSignal(int, int)
    def createEditor(self, parent, option, index):
        result = super(ItemDelegate, self).createEditor(parent, option, index)
        if result:
            self.cellEditingStarted.emit(index.row(), index.column())
        return result
 .
 .
 .

self.delegate = ItemDelegate()
self.delegate.cellEditingStarted.connect(self.showlistwidget)
self.tableWidget.setItemDelegate(self.delegate)

Upvotes: 0

Views: 517

Answers (1)

eyllanesc
eyllanesc

Reputation: 244301

Instead of detecting when the editor is displayed, you should use the editor's textChanged signal (QLineEdit):

from PyQt4 import QtCore, QtGui


class StyledItemDelegate(QtGui.QStyledItemDelegate):
    textChanged = QtCore.pyqtSignal(str)
    editingFinished = QtCore.pyqtSignal()

    def createEditor(self, parent, option, index):
        editor = super(StyledItemDelegate, self).createEditor(
            parent, option, index
        )
        if isinstance(editor, QtGui.QLineEdit):
            editor.textChanged.connect(self.textChanged)
            editor.editingFinished.connect(self.editingFinished)
        return editor


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

        self.table_widget = QtGui.QTableWidget(4, 4)
        self.table_widget.setHorizontalHeaderLabels(("Name", "1", "2", "3"))
        delegate = StyledItemDelegate(self.table_widget)
        delegate.textChanged.connect(self.filter)
        delegate.editingFinished.connect(self.clear_filter)
        self.table_widget.setItemDelegateForColumn(0, delegate)

        self.list_widget = QtGui.QListWidget()

        hlay = QtGui.QHBoxLayout(self)
        hlay.addWidget(self.table_widget)
        hlay.addWidget(self.list_widget)

        for letter1 in "ABCDEFGHIJKLMNOPQRSTUVWXYZ":
            for letter2 in "ABCDEFGHIJKLMNOPQRSTUVWXYZ":
                text = letter1 + letter2
                it = QtGui.QListWidgetItem(text)
                self.list_widget.addItem(it)

    @QtCore.pyqtSlot(str)
    def filter(self, text):
        self.clear_filter()
        for r in range(self.list_widget.count()):
            it = self.list_widget.item(r)
            # filter algorithm
            is_showing = text in it.text()
            # Hide the row if necessary
            it.setHidden(not is_showing)

    @QtCore.pyqtSlot()
    def clear_filter(self):
        for r in range(self.list_widget.count()):
            it = self.list_widget.item(r)
            it.setHidden(False)


if __name__ == "__main__":
    import sys

    app = QtGui.QApplication(sys.argv)
    w = Widget()
    w.show()
    sys.exit(app.exec_())

Update:

from functools import partial
from PyQt4 import QtCore, QtGui


class StyledItemDelegate(QtGui.QStyledItemDelegate):
    textChanged = QtCore.pyqtSignal(int, int, str)
    editingFinished = QtCore.pyqtSignal()

    def createEditor(self, parent, option, index):
        editor = super(StyledItemDelegate, self).createEditor(
            parent, option, index
        )
        if isinstance(editor, QtGui.QLineEdit):
            editor.textChanged.connect(
                partial(self.textChanged.emit, index.row(), index.column())
            )
            editor.editingFinished.connect(self.editingFinished)
        return editor


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

        self.table_widget = QtGui.QTableWidget(4, 4)
        self.table_widget.setHorizontalHeaderLabels(("Name", "1", "2", "3"))
        delegate = StyledItemDelegate(self.table_widget)
        delegate.textChanged.connect(self.filter)
        delegate.editingFinished.connect(self.clear_filter)
        self.table_widget.setItemDelegate(delegate)

        self.list_widget = QtGui.QListWidget()

        hlay = QtGui.QHBoxLayout(self)
        hlay.addWidget(self.table_widget)
        hlay.addWidget(self.list_widget)

        for letter1 in "ABCDEFGHIJKLMNOPQRSTUVWXYZ":
            for letter2 in "ABCDEFGHIJKLMNOPQRSTUVWXYZ":
                text = letter1 + letter2
                it = QtGui.QListWidgetItem(text)
                self.list_widget.addItem(it)

    @QtCore.pyqtSlot(int, int, str)
    def filter(self, row, column, text):
        print(row, column)
        self.clear_filter()
        for r in range(self.list_widget.count()):
            it = self.list_widget.item(r)
            # filter algorithm
            is_showing = text in it.text()
            # Hide the row if necessary
            it.setHidden(not is_showing)

    @QtCore.pyqtSlot()
    def clear_filter(self):
        for r in range(self.list_widget.count()):
            it = self.list_widget.item(r)
            it.setHidden(False)


if __name__ == "__main__":
    import sys

    app = QtGui.QApplication(sys.argv)
    w = Widget()
    w.show()
    sys.exit(app.exec_())

Upvotes: 1

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