直到作业完成，进度条才会呈现
直到作业完成，进度条才会呈现
提问于 2018-12-13 05:50:27
我正在尝试制作一个用于复制大文件的进度条。但是，在该过程完成之前，对话框窗口当前会变为黑色。我现在明白了，我可能必须学习如何使用treads并将数据传递回GUI。但是我仍然不明白为什么窗口不能完全渲染。我可以理解窗口是否因为moveFilesWithProgress函数正在运行而没有响应。但在该函数中，我正在更新进度条值。我甚至尝试添加QtGui.QGuiApplication.processEvents()，希望它能在继续迭代之前更新gui。
如果能在没有多线程进程的情况下修复这个问题，我将不胜感激，但如果不可能的话，我会非常感谢如何使用Qthread的一个愚蠢的例子。我发现了一个相关的问题，但有很多事情让我理解这个例子。here is the link
示例代码：
#!/usr/bin/env python
import os
import sys
import shutil
from PyQt5.QtWidgets import (QApplication, QDialog, QLineEdit, QMainWindow,
QPushButton, QProgressBar)
import PyQt5.QtGui as QtGui
class MainWindow(QMainWindow):
def __init__(self):
super(MainWindow, self).__init__()
self.button = QPushButton("Copy", self)
self.button.clicked.connect(self.archiveEntry)
self.show()
def archiveEntry(self):
self.p = ProgressBar()
self.p.show()
Dir = "/media/zachlab/Windows/LinuxStorage/old/embryos"
outDir = "/media/zachlab/Windows/LinuxStorage/old/out"
run = self.p.moveFilesWithProgress(Dir, outDir)
# if run:
# self.p.close
class ProgressBar(QDialog):
def __init__(self):
super().__init__()
self.pbar = QProgressBar(self)
def timerEvent(self, e):
if self.step >= 100:
self.timer.stop()
self.btn.setText('Finished')
return
self.pbar.setValue(self.step)
def update(self, value):
self.pbar.setValue(value)
QtGui.QGuiApplication.processEvents()
def calculateAndUpdate(self, done, total):
progress = int(round((done / float(total)) * 100))
self.update(progress)
def countFiles(self, directory):
files = []
if os.path.isdir(directory):
for path, dirs, filenames in os.walk(directory):
files.extend(filenames)
return len(files)
def makedirs(self, dest):
if not os.path.exists(dest):
os.makedirs(dest)
def moveFilesWithProgress(self, src, dest):
numFiles = self.countFiles(src)
if os.path.exists(dest):
return 0
if numFiles > 0:
self.makedirs(dest)
numCopied = 0
for path, dirs, filenames in os.walk(src):
for directory in dirs:
destDir = path.replace(src, dest)
self.makedirs(os.path.join(destDir, directory))
for sfile in filenames:
srcFile = os.path.join(path, sfile)
destFile = os.path.join(path.replace(src, dest), sfile)
shutil.copy(srcFile, destFile)
numCopied += 1
self.calculateAndUpdate(numCopied, numFiles)
self.show()
return 1
else:
return 0
if __name__ == "__main__":
app = QApplication(sys.argv)
ex = MainWindow()
sys.exit(app.exec_())回答 1
Stack Overflow用户
回答已采纳
发布于 2018-12-13 07:17:45
繁重的任务不应该在主线程上运行，你应该使用线程。在这种情况下，我替换了您的逻辑，所以有一个类负责复制文件，通过进程、错误等迹象通知。该类的一个对象将存在于通过信号通知图形用户界面的另一个线程中，在这种情况下，我将使用QProgressDialog来显示进度。
#!/usr/bin/env python
import os
import sys
import shutil
import threading
from PyQt5 import QtCore, QtGui, QtWidgets
class MainWindow(QtWidgets.QMainWindow):
startMoveFilesSignal = QtCore.pyqtSignal(str, str)
def __init__(self):
super(MainWindow, self).__init__()
srcdir = "/media/zachlab/Windows/LinuxStorage/old/embryos"
dstdir = "/media/zachlab/Windows/LinuxStorage/old/out"
self.le_src = QtWidgets.QLineEdit(srcdir)
self.le_dst = QtWidgets.QLineEdit(dstdir)
self.button = QtWidgets.QPushButton("Copy")
self.button.clicked.connect(self.archiveEntry)
central_widget = QtWidgets.QWidget()
self.setCentralWidget(central_widget)
lay = QtWidgets.QFormLayout(central_widget)
lay.addRow("From: ", self.le_src)
lay.addRow("To: ", self.le_dst)
lay.addRow(self.button)
self.progressbar = QtWidgets.QProgressDialog(self)
self.progressbar.hide()
thread = QtCore.QThread(self)
thread.start()
self.helper = MoveFileHelper()
self.startMoveFilesSignal.connect(self.helper.moveFilesWithProgress)
self.helper.progressChanged.connect(self.progressbar.setValue)
self.helper.finished.connect(self.on_finished)
self.helper.started.connect(self.progressbar.show)
self.helper.errorOccurred.connect(self.on_errorOcurred)
self.helper.moveToThread(thread)
@QtCore.pyqtSlot()
def archiveEntry(self):
self.startMoveFilesSignal.emit(self.le_src.text(), self.le_dst.text())
self.progressbar.hide()
@QtCore.pyqtSlot()
def on_finished(self):
self.button.setText('Finished')
@QtCore.pyqtSlot(str)
def on_errorOcurred(self, msg):
QtWidgets.QMessageBox.critical(self, "Error Ocurred", msg)
class MoveFileHelper(QtCore.QObject):
progressChanged = QtCore.pyqtSignal(int)
started = QtCore.pyqtSignal()
finished = QtCore.pyqtSignal()
errorOccurred = QtCore.pyqtSignal(str)
def calculateAndUpdate(self, done, total):
progress = int(round((done / float(total)) * 100))
self.progressChanged.emit(progress)
@staticmethod
def countFiles(directory):
count = 0
if os.path.isdir(directory):
for path, dirs, filenames in os.walk(directory):
count += len(filenames)
return count
@staticmethod
def makedirs(dest):
if not os.path.exists(dest):
os.makedirs(dest)
@QtCore.pyqtSlot(str, str)
def moveFilesWithProgress(self, src, dest):
numFiles = MoveFileHelper.countFiles(src)
if os.path.exists(dest):
self.errorOccurred.emit("Dest exist")
return
if numFiles > 0:
self.started.emit()
MoveFileHelper.makedirs(dest)
numCopied = 0
for path, dirs, filenames in os.walk(src):
for directory in dirs:
destDir = path.replace(src, dest)
MoveFileHelper.makedirs(os.path.join(destDir, directory))
for sfile in filenames:
srcFile = os.path.join(path, sfile)
destFile = os.path.join(path.replace(src, dest), sfile)
shutil.copy(srcFile, destFile)
numCopied += 1
self.calculateAndUpdate(numCopied, numFiles)
self.finished.emit()
if __name__ == "__main__":
app = QtWidgets.QApplication(sys.argv)
ex = MainWindow()
ex.resize(640, ex.sizeHint().height())
ex.show()
sys.exit(app.exec_())页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/53751909
复制相关文章
相似问题