如何在编辑 QTableWidget 单元格时将光标定位在鼠标单击的位置？答案

【问题标题】：How can I position the cursor where the mouse is clicked when editing a QTableWidget cell?如何在编辑 QTableWidget 单元格时将光标定位在鼠标单击的位置？
【发布时间】：2022-12-06 08:51:47
【问题描述】：

我的应用程序允许双击 QTableWidget 单元格来编辑内容，但光标始终位于现有内容的末尾。

not to be selected on edit的内容我已经整理好了。我怎样才能将编辑光标定位在单击鼠标的位置？

【问题讨论】：

也许，在同一函数内（取消选择后），通过将全局光标位置映射到小部件，根据 cursorPositionAt() 设置光标位置。

标签： pyqt5

【解决方案1】：

这是一种将插入点放置在您在网格单元格中单击的位置的方法。如下所述，您需要将一些东西放在正确的位置。这使用 QTableView 控件而不是 QTableWidget。我不确定会翻译多少。

import PySide2.QtWidgets as qtw
import PySide2.QtGui as qgui

from PySide2.QtCore import Qt

# place the cursor where the mouse was clicked in a cell
# based on https://stackoverflow.com/a/72792962 and a comment
# from @musicamanta at https://stackoverflow.com/q/73346426
class ClickPositionDelegate(QStyledItemDelegate):
    # override the createEditor behavior so we can capture the 
    # first `selectAll` that occurs automatically after the
    # QLineEdit control is created.
    def createEditor(self, parent, option, index):
        editor = super().createEditor(parent, option, index)
        # set margins so text in the control aligns with the grid (optional)
        editor.setTextMargins(4, 2, 2, 4)

        if isinstance(editor, qtw.QLineEdit):

            def position_cursor():
                # Catch the initial selectAll event via the selectionChanged 
                # signal; this ensures the position is calculated after the
                # control is placed on screen, so cursorPositionAt will work
                # correctly.

                # Disconnect so setCursorPosition won't call this func again
                editor.selectionChanged.disconnect(deselect)
                # Get cursor position within the editor's coordinate system
                gpos = qgui.QCursor.pos()
                lpos = editor.mapFromGlobal(gpos)
                editor.setCursorPosition(editor.cursorPositionAt(lpos))

            # queue up the positioning function if and only if we got here 
            # via a simple mouse click (left mouse button is currently down
            # with no modifiers)
            if (
                qgui.QGuiApplication.mouseButtons() == Qt.LeftButton
                and qgui.QGuiApplication.keyboardModifiers() == Qt.NoModifier
            ):
                editor.selectionChanged.connect(position_cursor)

        return editor

class MainWindow(QMainWindow):
    # Constructor
    def __init__(self):
        # Call the parent class's constructor
        super().__init__()

        ...

        # Create the data table
        self.table = QTableView(self)
        table_view = self.table

        # start editing as soon as a cell is selected (no need for Enter 
        # or double-click)
        self.table.setEditTriggers(QAbstractItemView.AllEditTriggers)
        # or self.table.setEditTriggers(QTableView.CurrentChanged)

        # call our special delegate to position the cursor correctly when
        # clicking on a cell
        self.table.setItemDelegate(ClickPositionDelegate(self.table))

        # Set the central widget of the main window
        self.setCentralWidget(self.table)

        ...

        # be sure to run self.table.setModel(some_model) at some point
        ...


app = QApplication()
window = MainWindow()
window.show()
app.exec_()

【讨论】：