Reserve space for initially hidden widget in QVBoxLayout within QScrollArea
layout, qt, visibility
Solution
I apologize for not being totally clear in my original question. It turns out that the problem seems to have been related to this widget having been contained within a QScrollArea. When I called `scrollArea->setWidgetResizable(true)`, things started to work perfectly.
Thanks for your suggestions, serge and Caleb.
Problem
I am using a QVBoxLayout to arrange a vertical stack of widgets. The QVBoxLayout is contained within a QScrollArea. I want some of the widgets to be initially hidden and only show up when a check box is checked. Here is an example of the code I'm using. ``` MyWidget::MyWidget(QWidget *parent) : QWidget(parent) { QVBoxLayout *layout = new QVBoxLayout(this); QLabel *labelLogTypes = new QLabel(tr("Log Types")); m_checkBoxCsv = new QCheckBox(tr("&Delimited File (CSV)")); m_labelDelimiter = new QLabel(tr("Delimiter:")); m_lineEditDelimiter = new QLineEdit(","); checkBoxCsv_Toggled(m_checkBoxCsv->isChecked()); connect(m_checkBoxCsv, SIGNAL(toggled(bool)), SLOT(checkBoxCsv_Toggled(bool))); QHBoxLayout *layoutDelimitedChar = new QHBoxLayout(); layoutDelimitedChar->addWidget(m_labelDelimiter); layoutDelimitedChar->addWidget(m_lineEditDelimiter); m_checkBoxXml = new QCheckBox(tr("&XML File")); m_checkBoxText = new QCheckBox(tr("Plain &Text File")); // Now that everything is constructed, put it all together // in the main layout. layout->addWidget(labelLogTypes); layout->addWidget(m_checkBoxCsv); layout->addLayout(layoutDelimitedChar); layout->addWidget(m_checkBoxXml); layout->addWidget(m_checkBoxText); layout->addStretch(); } MyWidget::checkBoxCsv_Toggled(bool checked) { m_labelDelimiter->setVisible(checked); m_lineEditDelimiter->setVisible(checked); } ``` I want `m_labelDelimiter` and `m_lineEditDelimiter` both to be initially invisible and I want their visibility to toggle with the state of m_checkBoxCsv. When they become visible, I would like the layout to expand vertically to accommodate them. This code achieves the functionality I desire, but it doesn't seem to reserve space for the two initially hidden widgets. When I check the checkbox, they become visible, but everything is kind of scrunched to accommodate them. If I leave them initially visible, everything is laid out just the way I would like it. Is there any way to make the QVBoxLayout reserve space for these widgets even if they're initially invisible? If I don't put this widget into a QScrollArea, then this code works exactly as I want it to. What is the deal with the QScrollArea?