如何在pyqt4的tablewidget中检测单元格中文本的编辑？

Question

我有一个tablewidget，在其中动态添加行，我必须在第一列中输入一个要特定的名称，因此我在tablewidget旁边有一个listwidget，其中显示了来自数据库的名称，因此现在如何检测单元格，以便我可以过滤掉listwidget中的名称。

我尝试了tablewidget发出的所有信号，但是没有运气，所有信号都是在单击鼠标或键盘按钮后发出的，我想检测输入或删除的每个字母在单个单元格中的变化。

我也尝试过ItemDelegate，但是它仅检测到编辑的开始，这是我的代码

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)

Answer 1

与其检测何时显示编辑器，不如使用编辑器的textChanged信号（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_())

更新：

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_())