视觉设计基础优化关键词有哪些方法

pdf工具，之前写的合并工具有点麻烦，使用PyQt5库重写合并拆分和删除指定页面的程序

实现如图：

代码：

import sysimport osfrom PyQt5.QtWidgets import QApplication, QMainWindow, QPushButton, QVBoxLayout, QWidget, QFileDialog, QListWidget, QMessageBox, QLineEdit, QHBoxLayout, QInputDialogfrom PyQt5.QtCore import Qt, QThread, pyqtSignalfrom PyPDF2 import PdfReader, PdfWriter, PdfMergerfrom PyQt5 import QtGuiclass CustomListWidget(QListWidget):def __init__(self, parent=None):super().__init__(parent)class Worker(QThread):finished = pyqtSignal(str)error = pyqtSignal(str)def __init__(self, pdf_files, range_str=None, save_path=None, operation=None):super().__init__()self.pdf_files = pdf_filesself.range_str = range_strself.save_path = save_pathself.operation = operationdef run(self):try:if self.operation == 'merge':merger = PdfMerger()for pdf in self.pdf_files:merger.append(pdf)merger.write(self.save_path)merger.close()self.finished.emit('PDF文件已成功合并。')elif self.operation == 'split':start_page, end_page = self.parse_range(self.range_str)reader = PdfReader(self.pdf_files[zxsq-anti-bbcode-0])os.makedirs(self.save_path, exist_ok=True)for page in range(start_page, end_page + 1):writer = PdfWriter()writer.add_page(reader.pages)split_save_path = os.path.join(self.save_path, f'Page_{page + 1}.pdf')writer.write(split_save_path)self.finished.emit('PDF文件已成功拆分并保存。')elif self.operation == 'delete':start_page, end_page = self.parse_range(self.range_str)reader = PdfReader(self.pdf_files[zxsq-anti-bbcode-0])writer = PdfWriter()for page_num in range(len(reader.pages)):if not (start_page <= page_num <= end_page):writer.add_page(reader.pages[zxsq-anti-bbcode-page_num])writer.write(self.save_path)self.finished.emit('指定页面已从PDF中删除。')except Exception as e:self.error.emit(str(e))def parse_range(self, range_str):if '-' in range_str:start_page, end_page = map(int, range_str.split('-'))else:start_page = end_page = int(range_str)return start_page - 1, end_page - 1  # Convert to 0-based indexclass PDFMergerApp(QMainWindow):def __init__(self):super().__init__()self.initUI()self.pdf_files = []def initUI(self):self.setWindowTitle('PDF 工具箱')self.setWindowIcon(QtGui.QIcon('111.ico'))self.setGeometry(100, 100, 800, 600)mainLayout = QVBoxLayout()self.addButton = QPushButton('添加 PDF', self)self.addButton.clicked.connect(self.addPDF)mainLayout.addWidget(self.addButton)self.listWidget = CustomListWidget(self)mainLayout.addWidget(self.listWidget)# 删除按钮的水平布局deleteLayout = QHBoxLayout()self.removeButton = QPushButton('删除选定', self)self.removeButton.clicked.connect(self.removeSelected)deleteLayout.addWidget(self.removeButton)self.removeAllButton = QPushButton('删除全部', self)self.removeAllButton.clicked.connect(self.removeAll)deleteLayout.addWidget(self.removeAllButton)mainLayout.addLayout(deleteLayout)self.mergeButton = QPushButton('合并 PDFs', self)self.mergeButton.clicked.connect(self.mergePDFs)mainLayout.addWidget(self.mergeButton)# 拆分和删除页码的水平布局splitDeleteLayout = QHBoxLayout()self.splitInput = QLineEdit(self)self.splitInput.setPlaceholderText('输入拆分范围，如 1 或 1-4')splitDeleteLayout.addWidget(self.splitInput)self.splitButton = QPushButton('拆分 PDF', self)self.splitButton.clicked.connect(self.splitPDF)splitDeleteLayout.addWidget(self.splitButton)self.deleteInput = QLineEdit(self)self.deleteInput.setPlaceholderText('输入删除页码，如 1 或 1-4')splitDeleteLayout.addWidget(self.deleteInput)self.deleteButton = QPushButton('删除页面', self)self.deleteButton.clicked.connect(self.deletePages)splitDeleteLayout.addWidget(self.deleteButton)mainLayout.addLayout(splitDeleteLayout)container = QWidget()container.setLayout(mainLayout)self.setCentralWidget(container)def addPDF(self):files, _ = QFileDialog.getOpenFileNames(self, '打开文件', '', 'PDF files (*.pdf)')for file_path in files:self.addPDFFile(file_path)def addPDFFile(self, file_path):if file_path and file_path not in self.pdf_files:self.pdf_files.append(file_path)self.listWidget.addItem(file_path)def removeSelected(self):for item in self.listWidget.selectedItems():self.pdf_files.remove(item.text())self.listWidget.takeItem(self.listWidget.row(item))def removeAll(self):self.pdf_files.clear()self.listWidget.clear()def mergePDFs(self):save_path, _ = QFileDialog.getSaveFileName(self, '保存文件', '', 'PDF files (*.pdf)')if save_path:self.thread = Worker(self.pdf_files, save_path=save_path, operation='merge')self.thread.finished.connect(self.onFinished)self.thread.error.connect(self.onError)self.thread.start()def splitPDF(self):if len(self.pdf_files) != 1:QMessageBox.warning(self, "错误", "请只选择一个PDF文件进行拆分。")returnrange_str = self.splitInput.text().strip()folder_path = self.getFolderName()if range_str and folder_path:self.thread = Worker(self.pdf_files, range_str=range_str, save_path=folder_path, operation='split')self.thread.finished.connect(self.onFinished)self.thread.error.connect(self.onError)self.thread.start()def getFolderName(self):folder_path = QFileDialog.getExistingDirectory(self, "选择保存拆分文件的位置")if folder_path:folder_name, ok = QInputDialog.getText(self, "文件夹名称", "输入文件夹名称:")if ok and folder_name:full_path = os.path.join(folder_path, folder_name)os.makedirs(full_path, exist_ok=True)return full_pathreturn Nonedef deletePages(self):if len(self.pdf_files) != 1:QMessageBox.warning(self, "错误", "请只选择一个PDF文件进行删除操作。")returnrange_str = self.deleteInput.text().strip()save_path = QFileDialog.getSaveFileName(self, '保存文件', '', 'PDF files (*.pdf)')[zxsq-anti-bbcode-0]if save_path and range_str:self.thread = Worker(self.pdf_files, range_str=range_str, save_path=save_path, operation='delete')self.thread.finished.connect(self.onFinished)self.thread.error.connect(self.onError)self.thread.start()def onFinished(self, message):self.show_message("操作完成", message)self.clear_pdf_list()def onError(self, error_message):self.show_message("操作失败", error_message)def show_message(self, title, message):QMessageBox.information(self, title, message)def clear_pdf_list(self):self.pdf_files.clear()self.listWidget.clear()def main():app = QApplication(sys.argv)ex = PDFMergerApp()ex.show()sys.exit(app.exec_())if __name__ == '__main__':main()