在 PyQt 中刷新 QTextEdit

发布于 2024-08-02 16:33:47 字数 5296 浏览 1 评论 0原文

我正在编写一个 PyQt 应用程序,它在一个小部件中接受一些输入,然后处理一些文本文件。

目前我得到的是,当用户单击“进程”按钮时,会弹出一个带有 QTextEdit 的单独窗口,并输出一些日志消息。

在 Mac OS X 上,此窗口会自动刷新,您可以看到该过程。

在 Windows 上,窗口会报告(未响应),然后一旦完成所有处理,就会显示日志输出。我假设我需要在每次写入日志后刷新窗口,并且我查看了如何使用计时器。等等,但没有运气让它发挥作用。

下面是源代码。它有两个文件,GUI.py 执行所有 GUI 操作,MOVtoMXF 执行所有处理。

GUI.py

import os
import sys
import MOVtoMXF
from PyQt4.QtCore import *
from PyQt4.QtGui import *


 class Form(QDialog):

     def process(self):
           path = str(self.pathBox.displayText())
           if(path == ''):
                QMessageBox.warning(self, "Empty Path", "You didnt fill something out.")
                return
           xmlFile = str(self.xmlFileBox.displayText())
           if(xmlFile == ''):
                QMessageBox.warning(self, "No XML file", "You didnt fill something.")
                return
           outFileName = str(self.outfileNameBox.displayText())
           if(outFileName == ''):
                QMessageBox.warning(self, "No Output File", "You didnt do something")
                return
           print path + "  " + xmlFile + " " + outFileName
           mov1 = MOVtoMXF.MOVtoMXF(path, xmlFile, outFileName, self.log)
           self.log.show()
           rc = mov1.ScanFile()
           if( rc < 0):
               print "something happened"
           #self.done(0)


      def __init__(self, parent=None):
            super(Form, self).__init__(parent)
            self.log = Log()
            self.pathLabel = QLabel("P2 Path:")
            self.pathBox = QLineEdit("")
            self.pathBrowseB = QPushButton("Browse")
            self.pathLayout = QHBoxLayout()
            self.pathLayout.addStretch()
            self.pathLayout.addWidget(self.pathLabel)
            self.pathLayout.addWidget(self.pathBox)
            self.pathLayout.addWidget(self.pathBrowseB)

            self.xmlLabel = QLabel("FCP XML File:")
            self.xmlFileBox = QLineEdit("")
            self.xmlFileBrowseB = QPushButton("Browse")
            self.xmlLayout = QHBoxLayout()
            self.xmlLayout.addStretch()
            self.xmlLayout.addWidget(self.xmlLabel)
            self.xmlLayout.addWidget(self.xmlFileBox)
            self.xmlLayout.addWidget(self.xmlFileBrowseB)


            self.outFileLabel = QLabel("Save to:")
            self.outfileNameBox = QLineEdit("")
            self.outputFileBrowseB = QPushButton("Browse")
            self.outputLayout = QHBoxLayout()
            self.outputLayout.addStretch()
            self.outputLayout.addWidget(self.outFileLabel)
            self.outputLayout.addWidget(self.outfileNameBox)
            self.outputLayout.addWidget(self.outputFileBrowseB)

            self.exitButton = QPushButton("Exit")
            self.processButton = QPushButton("Process")
            self.buttonLayout = QHBoxLayout()
            #self.buttonLayout.addStretch()
            self.buttonLayout.addWidget(self.exitButton)
            self.buttonLayout.addWidget(self.processButton) 
            self.layout = QVBoxLayout()
            self.layout.addLayout(self.pathLayout)
            self.layout.addLayout(self.xmlLayout)
            self.layout.addLayout(self.outputLayout)
            self.layout.addLayout(self.buttonLayout)
            self.setLayout(self.layout)
            self.pathBox.setFocus()
            self.setWindowTitle("MOVtoMXF")

            self.connect(self.processButton, SIGNAL("clicked()"), self.process)
            self.connect(self.exitButton, SIGNAL("clicked()"), self, SLOT("reject()"))
            self.ConnectButtons()


class Log(QTextEdit):

    def __init__(self, parent=None):
        super(Log, self).__init__(parent)
        self.timer = QTimer()
        self.connect(self.timer, SIGNAL("timeout()"), self.updateText())
        self.timer.start(2000) 

    def updateText(self):
        print "update Called"

和 MOVtoMXF.py

import os
import sys
import time
import string
import FileUtils
import shutil
import re

    class MOVtoMXF:
    #Class to do the MOVtoMXF stuff.

    def __init__(self, path, xmlFile, outputFile, edit):
        self.MXFdict = {}
        self.MOVDict = {}
        self.path = path
        self.xmlFile = xmlFile
        self.outputFile = outputFile
        self.outputDirectory = outputFile.rsplit('/',1)
        self.outputDirectory = self.outputDirectory[0]
        sys.stdout = OutLog( edit, sys.stdout)



class OutLog():

    def __init__(self, edit, out=None, color=None):
        """(edit, out=None, color=None) -> can write stdout, stderr to a
        QTextEdit.
        edit = QTextEdit
        out = alternate stream ( can be the original sys.stdout )
        color = alternate color (i.e. color stderr a different color)
        """
        self.edit = edit
        self.out = None
        self.color = color



    def write(self, m):
        if self.color:
            tc = self.edit.textColor()
            self.edit.setTextColor(self.color)

        #self.edit.moveCursor(QtGui.QTextCursor.End)
        self.edit.insertPlainText( m )

        if self.color:
            self.edit.setTextColor(tc)

        if self.out:
            self.out.write(m)
        self.edit.show()

如果需要任何其他代码(我认为这就是所需要的),请告诉我。

任何帮助都会很棒。

标记

Im writing a PyQt app that takes some input in one widget, and then processes some text files.

What ive got at the moment is when the user clicks the "process" button a seperate window with a QTextEdit in it pops up, and ouputs some logging messages.

On Mac OS X this window is refreshed automatically and you cna see the process.

On Windows, the window reports (Not Responding) and then once all the proccessing is done, the log output is shown. Im assuming I need to refresh the window after each write into the log, and ive had a look around at using a timer. etc, but havnt had much luck in getting it working.

Below is the source code. It has two files, GUI.py which does all the GUI stuff and MOVtoMXF that does all the processing.

GUI.py

import os
import sys
import MOVtoMXF
from PyQt4.QtCore import *
from PyQt4.QtGui import *


 class Form(QDialog):

     def process(self):
           path = str(self.pathBox.displayText())
           if(path == ''):
                QMessageBox.warning(self, "Empty Path", "You didnt fill something out.")
                return
           xmlFile = str(self.xmlFileBox.displayText())
           if(xmlFile == ''):
                QMessageBox.warning(self, "No XML file", "You didnt fill something.")
                return
           outFileName = str(self.outfileNameBox.displayText())
           if(outFileName == ''):
                QMessageBox.warning(self, "No Output File", "You didnt do something")
                return
           print path + "  " + xmlFile + " " + outFileName
           mov1 = MOVtoMXF.MOVtoMXF(path, xmlFile, outFileName, self.log)
           self.log.show()
           rc = mov1.ScanFile()
           if( rc < 0):
               print "something happened"
           #self.done(0)


      def __init__(self, parent=None):
            super(Form, self).__init__(parent)
            self.log = Log()
            self.pathLabel = QLabel("P2 Path:")
            self.pathBox = QLineEdit("")
            self.pathBrowseB = QPushButton("Browse")
            self.pathLayout = QHBoxLayout()
            self.pathLayout.addStretch()
            self.pathLayout.addWidget(self.pathLabel)
            self.pathLayout.addWidget(self.pathBox)
            self.pathLayout.addWidget(self.pathBrowseB)

            self.xmlLabel = QLabel("FCP XML File:")
            self.xmlFileBox = QLineEdit("")
            self.xmlFileBrowseB = QPushButton("Browse")
            self.xmlLayout = QHBoxLayout()
            self.xmlLayout.addStretch()
            self.xmlLayout.addWidget(self.xmlLabel)
            self.xmlLayout.addWidget(self.xmlFileBox)
            self.xmlLayout.addWidget(self.xmlFileBrowseB)


            self.outFileLabel = QLabel("Save to:")
            self.outfileNameBox = QLineEdit("")
            self.outputFileBrowseB = QPushButton("Browse")
            self.outputLayout = QHBoxLayout()
            self.outputLayout.addStretch()
            self.outputLayout.addWidget(self.outFileLabel)
            self.outputLayout.addWidget(self.outfileNameBox)
            self.outputLayout.addWidget(self.outputFileBrowseB)

            self.exitButton = QPushButton("Exit")
            self.processButton = QPushButton("Process")
            self.buttonLayout = QHBoxLayout()
            #self.buttonLayout.addStretch()
            self.buttonLayout.addWidget(self.exitButton)
            self.buttonLayout.addWidget(self.processButton) 
            self.layout = QVBoxLayout()
            self.layout.addLayout(self.pathLayout)
            self.layout.addLayout(self.xmlLayout)
            self.layout.addLayout(self.outputLayout)
            self.layout.addLayout(self.buttonLayout)
            self.setLayout(self.layout)
            self.pathBox.setFocus()
            self.setWindowTitle("MOVtoMXF")

            self.connect(self.processButton, SIGNAL("clicked()"), self.process)
            self.connect(self.exitButton, SIGNAL("clicked()"), self, SLOT("reject()"))
            self.ConnectButtons()


class Log(QTextEdit):

    def __init__(self, parent=None):
        super(Log, self).__init__(parent)
        self.timer = QTimer()
        self.connect(self.timer, SIGNAL("timeout()"), self.updateText())
        self.timer.start(2000) 

    def updateText(self):
        print "update Called"

AND MOVtoMXF.py

import os
import sys
import time
import string
import FileUtils
import shutil
import re

    class MOVtoMXF:
    #Class to do the MOVtoMXF stuff.

    def __init__(self, path, xmlFile, outputFile, edit):
        self.MXFdict = {}
        self.MOVDict = {}
        self.path = path
        self.xmlFile = xmlFile
        self.outputFile = outputFile
        self.outputDirectory = outputFile.rsplit('/',1)
        self.outputDirectory = self.outputDirectory[0]
        sys.stdout = OutLog( edit, sys.stdout)



class OutLog():

    def __init__(self, edit, out=None, color=None):
        """(edit, out=None, color=None) -> can write stdout, stderr to a
        QTextEdit.
        edit = QTextEdit
        out = alternate stream ( can be the original sys.stdout )
        color = alternate color (i.e. color stderr a different color)
        """
        self.edit = edit
        self.out = None
        self.color = color



    def write(self, m):
        if self.color:
            tc = self.edit.textColor()
            self.edit.setTextColor(self.color)

        #self.edit.moveCursor(QtGui.QTextCursor.End)
        self.edit.insertPlainText( m )

        if self.color:
            self.edit.setTextColor(tc)

        if self.out:
            self.out.write(m)
        self.edit.show()

If any other code is needed (i think this is all that is needed) then just let me know.

Any Help would be great.

Mark

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微暖i 2024-08-09 16:33:47

看起来您正在运行一个外部程序,将其输出捕获到 QTextEdit 中。我没有看到 Form.process 的代码,但我猜测在 Windows 上您的函数会等待外部程序完成,然后快速将所有内容转储到 QTextEdit 中。

如果您的界面确实正在等待其他进程完成,那么它将以您描述的方式挂起。您需要查看 subprocess 甚至 popen 才能以“非阻塞”方式获取程序的输出。

避免“(无响应)”的关键是每隔几秒调用QApplication.processEvents几次。 QTimer 在这种情况下不会有帮助,因为如果 Qt 无法处理其事件,它就无法调用任何信号处理程序。

It looks like your are running an external program, capturing its output into a QTextEdit. I didn't see the code of Form.process, but I am guessing on windows your function waits for the external program to finish, then quickly dumps everything to the QTextEdit.

If your interface really is waiting for the other process to finish, then it will hang in the manner you describe. You'll need to look at subprocess or perhaps even popen to get the program's output in a "non-blocking" manner.

The key to avoiding "(Not Responding)" is to call QApplication.processEvents a few times every few seconds. The QTimer is not going to help in this case, because if Qt cannot process its events, it cannot call any signal handlers.

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