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POHow can I prevent a QTextArea from being erased?
 

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  1. POHow can I prevent a QTextArea from being erased?
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    <p>I have a QPlainTextEdit in a modal dialog window (subclass of QDialog). Whenever I minimize the dialog and bring it back up, all the text in the QTextArea has disappeared.</p> <p>How can I preserve the text in my QPlainTextEdit widget?</p> <p>I've tried saving the text in the textedit widget like this:</p> <pre><code>def __init__(self): self.text_area = self.QPlainTextEdit() self.previous_text = '' def hideEvent(self, event): self.previous_text = self.text_area.toPlainText() def showEvent(self, event): self.text_area.setPlainText(self.previous_text) </code></pre> <p>But this approach didn't yield any appreciable results.</p> <p><strong>EDIT:</strong> I've noticed that this only happens when I can actually hide the modal dialog ... which seems to only be possible when I use Xmonad as my window manager ... whenever I try this in GNOME or on Windows, this behavior cannot be reproduced because those window managers actually prevent the modal dialog from being minimized.</p> <p><strong>EDIT:</strong> Following @Avaris's comment below, I tried enabling minimization for the modal <code>QDialog</code> like so:</p> <pre><code>def __init__(self): ... self.setWindowFlags(QtCore.Qt.WindowMinimizeButtonHint) </code></pre> <p>With this flag set, the vanishing text behavior can be replicated on Windows, GNOME and XMonad.</p> <p>Here is a visual example from my Windows machine before I minimize the window: <img src="https://i.stack.imgur.com/mtJ9P.png" alt="Before I minimize the window"></p> <p>And here's what it looks like after I bring up the window again: <img src="https://i.stack.imgur.com/g3bWu.png" alt="After I minimize the window"></p> <p><strong>EDIT:</strong> Text is written to the modal dialog's <code>QPlainTextEdit</code> like so:</p> <pre><code>def write(self, text): self.text_area.insertPlainText(QtCore.QString(text)) </code></pre> <p>The text itself is retrieved as a python string from a system of threads whose standard out has been captured and redirected. By the time is gets to the above <code>write()</code> function, the text itself is simply a python string.</p> <p><strong>EDIT:</strong> When I modify the <code>write</code> method mentioned above like so (following @ekhumoro's suggestion):</p> <pre><code>def write(self, text): self.text_area.insertPlainText(text) </code></pre> <p>The text is still missing after hiding and showing the dialog.</p>
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    1. USJames
    1. USJames
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      1. POHow can I prevent a QTextArea from being erased?
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      1. VTUpMod
    1. COPlease provide an example. That is not the normal behavior.
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      1. POHow can I prevent a QTextArea from being erased?
      1. USAvaris
    2. COYou can have a minimizable modal `QDialog`. Check the `setWindowFlags` method. But that shouldn't make any text in `QPlainTextEdit` vaporize when you minimize. I suspect your window manager does something sketchy, like creating a new dialog when you minimize/restore.
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      1. POHow can I prevent a QTextArea from being erased?
      1. USAvaris
    3. CO@Avaris, using `setWindowFlags` like you suggest does make the window minimizeable, but the text is still missing when I restore the window. The odd thing is that this behavior is replicable on _both_ GNOME and Xmonad.
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      1. POHow can I prevent a QTextArea from being erased?
      1. USJames
 

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