PySide QWidget 立即更新

发布于 2025-01-04 00:10:45 字数 548 浏览 1 评论 0原文

在我的应用程序中，我调用了一个外部模块，该模块生成一些线程，执行一些操作，然后返回一个值。我试图让 QMessageBox 在之前显示，并让 QLabel 在之后更新完成，但我被难住了。代码如下（从按钮上的 QObject.connect 调用）：

def _process(self):
  self._message_box.show()

  for i in range(3):
     rv = external_module_function_with_threads() // blocking function call
     label = getattr(self, "label%d" % (i + 1))
     label.setText(rv)

当我单击按钮并调用该函数时，消息框仅在循环完成后显示。标签也仅在循环完成后更新。我尝试在循环中调用 label.repaint() ，但似乎所做的只是让消息框更早显示（但其中没有文本）。

我知道我没有违反“主线程外部的 GUI 操作”规则（...对吗？），那么有没有办法强制更新？

原文

In my application, I have a call to an external module which spawns some threads, does some stuff, then returns a value. I'm trying to get a QMessageBox to show before and a QLabel to update after this is complete, but I'm stumped. The code goes something like this (called from QObject.connect on a button):

def _process(self):
  self._message_box.show()

  for i in range(3):
     rv = external_module_function_with_threads() // blocking function call
     label = getattr(self, "label%d" % (i + 1))
     label.setText(rv)

When I click the button and the function is called, the message box only shows after the loop completes. The labels only update after the loop completes as well. I tried calling label.repaint() in the loop, but all that seems to do is make the message box show up earlier (but with no text in it).

I know I'm not violating the "GUI operations from outside the main thread" rule (...right?), so is there a way to force an update?

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夏日浅笑〃 2025-01-11 00:10:45

对于消息框，请使用 self._message_box.exec_()。根据我对你问题的理解，我认为这会达到你想要的效果。

from PySide.QtCore import *
from PySide.QtGui  import *

import sys
import time


class Main(QWidget):

    def __init__(self, parent=None):
        super(Main, self).__init__(parent)

        layout = QVBoxLayout(self)

        button = QPushButton("Press me")
        self.label = QLabel("Run #")

        map(layout.addWidget, [button, self.label])
        button.pressed.connect(self.buttonPressed)

        self.messageBox = QMessageBox()

    def buttonPressed(self):
        self.messageBox.exec_()
        Thread().run(self.label)


class Thread(QThread):

    def run(self, label):
        for x in range(5):
            self.updateLabel(label)
            app.processEvents()
            time.sleep(.5)

    def updateLabel(self, label):
        try:
            number = int(label.text().split(" ")[-1])
            number += 1
        except ValueError:
            number = 0
        label.setText("Run %i" % number)


app = QApplication([])
main = Main()
main.show()
sys.exit(app.exec_())

For your message box use self._message_box.exec_(). From my understanding of your question, I think this will do what you want.

from PySide.QtCore import *
from PySide.QtGui  import *

import sys
import time


class Main(QWidget):

    def __init__(self, parent=None):
        super(Main, self).__init__(parent)

        layout = QVBoxLayout(self)

        button = QPushButton("Press me")
        self.label = QLabel("Run #")

        map(layout.addWidget, [button, self.label])
        button.pressed.connect(self.buttonPressed)

        self.messageBox = QMessageBox()

    def buttonPressed(self):
        self.messageBox.exec_()
        Thread().run(self.label)


class Thread(QThread):

    def run(self, label):
        for x in range(5):
            self.updateLabel(label)
            app.processEvents()
            time.sleep(.5)

    def updateLabel(self, label):
        try:
            number = int(label.text().split(" ")[-1])
            number += 1
        except ValueError:
            number = 0
        label.setText("Run %i" % number)


app = QApplication([])
main = Main()
main.show()
sys.exit(app.exec_())

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