在被点击时发出 QTableWidgetItem 特定的信号

Question

我想实现可以选择和取消选择 QTableWidget 内的多个 QTableWidgetItem 的功能，以便知道这些 QTableWidgetItem 的值和“位置”以供进一步使用。

QTableWidget 内部有一些空单元格，用于美学/间距，我试图实现的功能应该忽略这些单元格。 但这也可以在事后通过检查所选项目是否有内容来轻松完成。

self.table_widget.itemClicked.connect(self.some_function)

这将是最合适的信号，但我无法指定或知道在表格小部件内单击了哪个项目，或者是被选中还是未选中。

问题：如何实现在按下特定 QTableWidgetItem 时发出特定信号的功能？

---

这里有一些用于示例的伪代码：

class Window(QtWidgets.QMainWindow):
    def __init__(self):

        super(Window, self).__init__()
        uic.loadUi("qtdesignerfile.ui", self)
        self.show()
        #connect signal to function
        self.table_widget.itemClicked.connect(self.some_function)
        #create "global" list to save all selected items
        self.selected_items = []

    #some function to execute the logic
    def some_function(self):
        #condition distinguishing if item was just selected or unselected
        if QTableWidgetItem(row, column) is not already selected:

            #change background color to indicate selection
            self.table_widget.item(row,column).setBackground(QtGui.QColor(100,100,100))
            #"format" information of clicked item for further use
            selected_item = [str(table_widget.item(row,column).text()), row, column]
            #"save" selected item in global list for further use
            self.selected_items.append(selected_item)

        #condition distinguishing if item was just selected or unselected
        if QTableWidgetItem(row, column) is already selected:

            #change background color to indicate un-selection 
            self.table_widget.item(row,column).setBackground(QtGui.QColor(0,0,0))
            #"format" information of clicked item for further use
            selected_item = [str(table_widget.item(row,column).text()), row, column]
            #remove the un-selected item from global list
            self.selected_items.remove(selected_item)

示例 ui 文件：

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>418</width>
    <height>297</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <widget class="QWidget" name="centralwidget">
   <layout class="QGridLayout" name="gridLayout">
    <item row="0" column="0">
     <widget class="QTableWidget" name="table_widget">
      <row>
       <property name="text">
        <string>Row 1</string>
       </property>
      </row>
      <row>
       <property name="text">
        <string>Row 2</string>
       </property>
      </row>
      <row>
       <property name="text">
        <string>Row 3</string>
       </property>
      </row>
      <row>
       <property name="text">
        <string>Row 4</string>
       </property>
      </row>
      <row>
       <property name="text">
        <string>Row 5</string>
       </property>
      </row>
      <row>
       <property name="text">
        <string>Row 6</string>
       </property>
      </row>
      <column>
       <property name="text">
        <string>Grouping</string>
       </property>
      </column>
      <column>
       <property name="text">
        <string>Column 2</string>
       </property>
      </column>
      <column>
       <property name="text">
        <string>Column 3</string>
       </property>
      </column>
      <item row="0" column="0">
       <property name="text">
        <string>category 1</string>
       </property>
      </item>
      <item row="1" column="1">
       <property name="text">
        <string>Entry (1,1)</string>
       </property>
      </item>
      <item row="1" column="2">
       <property name="text">
        <string>Entry(1,2)</string>
       </property>
      </item>
      <item row="2" column="1">
       <property name="text">
        <string>Entry(2,1)</string>
       </property>
      </item>
      <item row="2" column="2">
       <property name="text">
        <string>Entry(2,2)</string>
       </property>
      </item>
      <item row="3" column="0">
       <property name="text">
        <string>category 2</string>
       </property>
      </item>
      <item row="4" column="1">
       <property name="text">
        <string>Entry(4,1)</string>
       </property>
      </item>
      <item row="4" column="2">
       <property name="text">
        <string>Entry(4,2)</string>
       </property>
      </item>
      <item row="5" column="1">
       <property name="text">
        <string>Entry(5,1)</string>
       </property>
      </item>
      <item row="5" column="2">
       <property name="text">
        <string>Entry(5,2)</string>
       </property>
      </item>
     </widget>
    </item>
   </layout>
  </widget>
  <widget class="QMenuBar" name="menubar">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>418</width>
     <height>21</height>
    </rect>
   </property>
  </widget>
  <widget class="QStatusBar" name="statusbar"/>
 </widget>
 <resources/>
 <connections/>
</ui>

---

我对如何轻松实现此功能感到非常困惑，并对不同方法的建议持开放态度。

应用程序的用户应该能够选择多个QTableWidgetItems，以便将项目所在行的信息转移到另一个QTableWidget以供进一步使用。

Answer 1

如果元素存在，itemClicked 信号确实会传递被按下的元素，默认情况下，Qt Designer 只创建它编辑过的元素，在适当的地方放置文本。

from PyQt5 import QtCore, QtGui, QtWidgets, uic

SelectedRole = QtCore.Qt.UserRole + 1000


class Window(QtWidgets.QMainWindow):
    def __init__(self):

        super(Window, self).__init__()
        uic.loadUi("qtdesignerfile.ui", self)

        # self.tableWidget.setEditTriggers(QtWidgets.QAbstractItemView.NoEditTriggers)
        self.tableWidget.itemClicked.connect(self.onClicked)

    @QtCore.pyqtSlot(QtWidgets.QTableWidgetItem)
    def onClicked(self, it):
        state = not it.data(SelectedRole)
        it.setData(SelectedRole, state)
        it.setBackground(
            QtGui.QColor(100, 100, 100) if state else QtGui.QColor(0, 0, 0)
        )


if __name__ == "__main__":
    import sys

    app = QtWidgets.QApplication(sys.argv)
    w = Window()
    w.show()
    sys.exit(app.exec_())