PyQt5 QTableWidget 单元格合并：解决多选与重叠合并问题

import sys from PyQt5.QtCore import Qt, QEvent from PyQt5.QtWidgets import QApplication, QMainWindow, QTableWidget, QVBoxLayout, QWidget, QPushButton, QMessageBox   class ExcelLikeTable(QMainWindow):     def __init__(self):         super().__init__()          self.mergeButton = None         self.unmergeButton = None         self.tableWidget = QTableWidget()         self.initUI()      def initUI(self):         self.setWindowTitle("Excel-like Table with PyQt5")         self.setGeometry(100, 100, 800, 600)          self.tableWidget.setColumnCount(10)         self.tableWidget.setHorizontalHeaderLabels([f'Column {chr(65+i)}' for i in range(10)])         self.tableWidget.setRowCount(10) # 增加初始行数以便测试          # 填充一些示例数据         for r in range(10):             for c in range(10):                 self.tableWidget.setItem(r, c, QTableWidgetItem(f"Cell {chr(65+c)}{r+1}"))          self.tableWidget.clearSelection()         # 确保选择模式允许连续选择项目         self.tableWidget.setSelectionMode(QTableWidget.ContiguousSelection)         self.tableWidget.setSelectionBehavior(QTableWidget.SelectItems)          self.mergeButton = QPushButton("Merge Cells")         self.unmergeButton = QPushButton("Unmerge Cells")         self.mergeButton.clicked.connect(self.mergeCells)         self.unmergeButton.clicked.connect(self.unmergeCells)          layout = QVBoxLayout()         layout.addWidget(self.tableWidget)         layout.addWidget(self.mergeButton)         layout.addWidget(self.unmergeButton)          centralWidget = QWidget()         centralWidget.setLayout(layout)         self.setCentralWidget(centralWidget)          self.tableWidget.installEventFilter(self)      def mergeCells(self):         # 使用 selectedIndexes() 获取所有选中单元格的索引         selection = self.tableWidget.selectedIndexes()          if not selection:             QMessageBox.information(self, "提示", "请选择要合并的单元格。")             return          if len(selection) == 1:             QMessageBox.information(self, "提示", "只选中了一个单元格，无需合并。")             return          # 在合并新区域前，先清除选中单元格可能存在的旧合并状态         # 这一步非常关键，可以避免复杂的嵌套或重叠合并问题         for index in selection:             row, column = index.row(), index.column()             # 检查当前单元格是否是某个合并区域的起始点             if (self.tableWidget.rowSpan(row, column) > 1 or                 self.tableWidget.columnSpan(row, column) > 1):                 # 如果是，将其跨度重置为1x1，即取消该单元格的合并状态                 self.tableWidget.setSpan(row, column, 1, 1)          # 清除跨度操作可能会影响当前的 selection，所以重新获取并排序         # 排序确保索引按行、列顺序排列，便于确定合并区域的边界         selection = sorted(self.tableWidget.selectedIndexes())          # 确定合并区域的边界         topRow = selection[0].row()         leftColumn = selection[0].column()         bottomRow = selection[-1].row()         rightColumn = selection[-1].column()          # 检查选择是否是连续的矩形区域         # 遍历所有选中索引，确保它们都在由 topRow, leftColumn, bottomRow, rightColumn          # 定义的矩形区域内，并且该区域内的所有单元格都被选中。         # 这一步是为了防止用户选择非连续的单元格进行合并         expected_cells = set()         for r in range(topRow, bottomRow + 1):             for c in range(leftColumn, rightColumn + 1):                 expected_cells.add((r, c))          actual_cells = set()         for index in selection:             actual_cells.add((index.row(), index.column()))          if expected_cells != actual_cells:             QMessageBox.warning(self, "警告", "请选择一个连续的矩形区域进行合并。")             return          rowCount = bottomRow - topRow + 1         columnCount = rightColumn - leftColumn + 1          # 执行合并操作         self.tableWidget.setSpan(topRow, leftColumn, rowCount, columnCount)         QMessageBox.information(self, "成功", f"单元格已合并：从 ({topRow+1}, {chr(65+leftColumn)}) 到 ({bottomRow+1}, {chr(65+rightColumn)})")       def unmergeCells(self):         # QTableWidget 提供了 clearSpans() 方法，可以一次性清除所有单元格的合并状态         self.tableWidget.clearSpans()         QMessageBox.information(self, "成功", "所有单元格合并已取消。")      def addRow(self):         rowCount = self.tableWidget.rowCount()         self.tableWidget.insertRow(rowCount)      def eventFilter(self, source, event):         if event.type() == QEvent.KeyPress and event.key() == Qt.Key_Return:             currentRow = self.tableWidget.currentRow()             currentColumn = self.tableWidget.currentColumn()             if currentRow == self.tableWidget.rowCount() - 1:                 self.addRow()             self.tableWidget.setCurrentCell(currentRow + 1, currentColumn)             return True         return super(ExcelLikeTable, self).eventFilter(source, event)      # 调试方法，用于打印单元格跨度信息     def debugPrintCellSpans(self):         print("Debugging cell spans:")         for i in range(self.tableWidget.rowCount()):             for j in range(self.tableWidget.columnCount()):                 rowSpan = self.tableWidget.rowSpan(i, j)                 colSpan = self.tableWidget.columnSpan(i, j)                 if rowSpan > 1 or colSpan > 1:                     print(f"Cell at ({i+1}, {chr(65+j)}) has row span: {rowSpan}, column span: {colSpan}")  if __name__ == '__main__':     app = QApplication(sys.argv)     ex = ExcelLikeTable()     ex.show()     sys.exit(app.exec_())

class ExcelLikeTable(QMainWindow):     # ... (其他代码保持不变)      def unmergeCells(self):         # QTableWidget 提供了 clearSpans() 方法，可以一次性清除所有单元格的合并状态         self.tableWidget.clearSpans()         QMessageBox.information(self, "成功", "所有单元格合并已取消。")      # ... (其他代码保持不变)