코딩도상국

import sys
import os

from PyPDF2.pdf import *
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
from PyQt5.QtGui import *


class MainWidget(QWidget):
    def __init__(self):
        super().__init__()
        manual_label = [QLabel("<b>PDF Application"), QLabel("Created by JS")]

        for i in range(0, 2):
            manual_label[i].setStyleSheet("Color : gray")
            manual_label[i].setFont(QFont("", 40 - (12 * i)))

        hbox = [QHBoxLayout(), QHBoxLayout()]
        for i in range(0, 2):
            hbox[i].addStretch(1)
            hbox[i].addWidget(manual_label[i])
            hbox[i].addStretch(1)

        vbox = QVBoxLayout()
        vbox.addStretch(1)
        vbox.addLayout(hbox[0])
        vbox.addLayout(hbox[1])
        vbox.addStretch(1)

        self.setLayout(vbox)


class ListboxWidget(QListWidget):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.setAcceptDrops(True)

    def dragEnterEvent(self, event):
        if event.mimeData().hasUrls:
            event.accept()
        else:
            event.ignore()

    def dragMoveEvent(self, event):
        if event.mimeData().hasUrls():
            event.setDropAction(Qt.CopyAction)
            event.accept()
        else:
            event.ignore()

    def dropEvent(self, event):
        if event.mimeData().hasUrls():
            event.setDropAction(Qt.CopyAction)
            event.accept()

            links = []

            for i in event.mimeData().urls():
                if str(i).find(".pdf") > 0:
                    if i.isLocalFile():
                        links.append(str(i.toLocalFile()))
                    else:
                        links.append(str(i.toString()))
            self.addItems(links)
        else:
            event.ignore()


class PDFMerge(QWidget):
    def __init__(self):
        super().__init__()
        self.pushButton = QPushButton(self)
        self.pushButton.setGeometry(QRect(20, 440, 451, 31))
        self.pushButton.setText("합치기")

        self.groupBox = QGroupBox(self)
        self.groupBox.setGeometry(QRect(20, 20, 451, 410))
        self.groupBox.setFlat(False)
        self.groupBox.setCheckable(False)
        self.groupBox.setTitle("<PDF 리스트>")

        self.listWidget = ListboxWidget(self.groupBox)
        self.listWidget.setGeometry(QRect(20, 30, 411, 250))

        self.pushButton_4 = QPushButton(self.groupBox)
        self.pushButton_4.setGeometry(QRect(20, 310, 93, 28))
        self.pushButton_4.setText("위 이동")

        self.pushButton_5 = QPushButton(self.groupBox)
        self.pushButton_5.setGeometry(QRect(20, 350, 93, 28))
        self.pushButton_5.setText("아래 이동")

        self.pushButton_6 = QPushButton(self.groupBox)
        self.pushButton_6.setGeometry(QRect(180, 310, 93, 71))
        self.pushButton_6.setText("추 가")

        self.pushButton_7 = QPushButton(self.groupBox)
        self.pushButton_7.setGeometry(QRect(340, 310, 93, 71))
        self.pushButton_7.setText("제 거")

        self.pushButton_6.clicked.connect(self.add_PDF)
        self.pushButton_7.clicked.connect(self.del_PDF)
        self.pushButton_4.clicked.connect(self.up_PDF)
        self.pushButton_5.clicked.connect(self.down_PDF)
        self.pushButton.clicked.connect(self.merge_PDF)

    def add_PDF(self):
        fname = QFileDialog.getOpenFileName(self, "open file", "", "PDF File(*.pdf)")
        self.listWidget.addItem(QListWidgetItem(fname[0]))

    def set_PDF(self):
        dirname = QFileDialog.getExistingDirectory(None)
        self.listWidget_2.clear()
        self.listWidget_2.addItem(QListWidgetItem(dirname))

    def del_PDF(self):
        self.listWidget.takeItem(self.listWidget.currentRow())

    def up_PDF(self):
        row = self.listWidget.currentRow()
        if row > 0:
            item = self.listWidget.takeItem(row)
            self.listWidget.insertItem(row - 1, item)
            self.listWidget.setCurrentRow(row - 1)

    def down_PDF(self):
        row = self.listWidget.currentRow()
        if row < self.listWidget.count() - 1:
            item = self.listWidget.takeItem(row)
            self.listWidget.insertItem(row + 1, item)
            self.listWidget.setCurrentRow(row + 1)

    def merge_PDF(self):
        count = self.listWidget.count()

        if count == 0:
            QMessageBox.information(self, '경고', "저장할 파일이 없습니다.", QMessageBox.Yes)

        else:
            down_path, _ = QFileDialog.getSaveFileName(self, "Open", "", "PDF(*.pdf)")

            if down_path:
                output = PdfFileWriter()
                for x in range(0, count):
                    src = self.listWidget.item(x)

                    inputs = PdfFileReader(open(src.text(), "rb"))
                    for j in range(inputs.getNumPages()):
                        output.addPage(inputs.getPage(j))
                dest = down_path

                with open(dest, "wb") as outstream:
                    output.write(outstream)


class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()

        # menu bar widget 모음
        menu = self.menuBar()
        menu_pdf = menu.addMenu('    PDF   ')

        self.pdf_merge = QAction('PDF 합치기', self)
        menu_pdf.addAction(self.pdf_merge)  # menu bar 에 lpf 를 붙임
        self.pdf_merge.triggered.connect(lambda x: self.applyfunc('merge'))  # 로우패스필터를 누르면 applyDock 연결

        self.widget = MainWidget()
        self.setCentralWidget(self.widget)

        self.setEnabled(True)
        self.resize(500, 500)
        self.setWindowTitle("PDF Application")  # Program Title
        self.setFixedSize(500, 550)

        self.show()

    def applyfunc(self, function):
        if function == "merge":
            merge_widget = PDFMerge()
            self.setCentralWidget(merge_widget)


if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = MainWindow()
    sys.exit(app.exec_())