Toolbar spacer does not expand to the right corner

[VRonin]

1. Did you try the minimal example above?
2. What version of Qt are you using?
3. Do you customise any of the widgets on the right of the spacer?
   • if you give QSizePolicy::Expanding or minimum sizes to them they will be respected

[TommyTLC]

@VRonin I did try to include the spacer just like you do in your minimal example, but the problem is still there, therefore the issue might be somewhere else. I am working with Qt version 5.15.

This is all I have to the right of the spacer:

m_fileToolBar->addWidget(new QLabel(tr("   Style:")));
QAction* stylesAction = m_fileToolBar->addWidget(createComboBoxStyle());
stylesAction->setToolTip(tr("Styles switcher"));

m_fileToolBar->addSeparator(); 
m_fileToolBar->addAction(m_aboutAction);

Where m_fileToolBar is my toolBar and 2 actions as well as a separator and a label are added (these can be seen in the picture included in the original post).

[VRonin]

I suspect the problem is not with the spacer widget but with something else in your code.
We need to narrow down the list of suspects.
Please answer the point 1 above and, in addition:

4. what is the body of createComboBoxStyle?
5. how do you create m_aboutAction?

[mrjj]

Hi
Just as a note.
You could apply a style sheet

spacer->setStyleSheet("QWidget{ background-color: rgb(178, 255, 34);}");

so its clear how it's placed.

[TommyTLC]

@VRonin ok so I have tried creating a new project with your minimal example and that works perfectly! The problem is now understanding what's causing the issue in my project.

4. m_styleSwitcher = new QComboBox(this);
   m_styleSwitcher->addItem(m_defaultStyleAction->text(), Default);
   m_styleSwitcher->addItem(m_fusionStyleAction->text(), Fusion);
   m_styleSwitcher->addItem(QStringLiteral("VisualStudio2019 ") + m_themeBlueAction->text(), VS2019Blue);
   m_styleSwitcher->addItem(QStringLiteral("VisualStudio2019 ") + m_themeDarkAction->text(), VS2019Dark);
   m_styleSwitcher->addItem(QStringLiteral("VisualStudio2019 ") + m_themeLightAction->text(), VS2019Light);
   m_styleSwitcher->setCurrentIndex(static_cast<int>(m_appStyle));
   connect(m_styleSwitcher, SIGNAL(currentIndexChanged(int)), this, SLOT(styleIndexChanged(int)));
   return m_styleSwitcher;

5. m_aboutAction is created in the .h file:

   QAction* m_aboutAction;

[TommyTLC]

@mrjj This might actually help understanding the cause of the issue. I have applied the style sheet to the spacer. When the window is in full screen mode I can correctly see the spacer object:

While having the application in a smaller window I do not see the style sheet:

[mrjj]

@TommyTLC
Ok so does it go into the >> or is then completely gone ?

[TommyTLC]

@mrjj in the >> I only see my m_aboutAction. It looks like the spacer disappears when the application is not in full screen.

[mrjj]

@TommyTLC
That i have not seen before. :)
Could you give your spacer object a name with setObjectName and
then do
ui->menubar->dumpObjectTree();
(adjust to name)

Then it will show all its sub objexts like

QMenuBar::menubar 
    QToolButton::qt_menubar_ext_button 
    QMenu::menuMENU 
        QAction:: 
    QMenu::menuMENU2 
        QAction:: 
    QMenu::menuMENU3 
        QAction:: 

just to see if its still in or really gone. Its kinda hard for a widget to just fall off as it's owned by the parent.

[TommyTLC]

@mrjj This is what I have done:

spacer->setObjectName("spacerName");
ui->m_fileToolBar->dumpObjectTree();

It looks like this function does not allow the use of "ui". If I follow the error's suggestion and use a pointer type toward m_fileToolBar I get another error saying that m_fileToolBar is not a member of the Ui::MainWindow class.

[mrjj]

Hi
the name m_fileToolBar suggest to me its not in a UI
so its just
m_fileToolBar->dumpObjectTree();

[TommyTLC]

@mrjj Thank you! Here's the output (I have given my spacer object the name "spacerName"):

Qtitan::DockToolBar::
Qtitan::DockToolBarLayout::
Qtitan::DockToolBarExtension::
QMenu::
QAction::
Qtitan::ToolButton::
QWidgetAction::
QLineEdit::
QWidgetLineControl::
Qtitan::ToolButton::
QWidgetAction::
QSpinBox::
QLineEdit::qt_spinbox_lineedit
QWidgetLineControl::
QValidator::qt_spinboxvalidator
Qtitan::ToolButton::
QWidgetAction::
QWidget::spacerName

[mrjj]

@TommyTLC
Ok so it is still there :)
Then i would
qDebug() << "size" << qDebug() << spacer->geometry();
and it will show something like
QRect(747,339 75x23)

as it could be fun to see its location and size.

[TommyTLC]

@mrjj This is where my spacer is located/its size: QRect(0,0 1180x480)

[mrjj]

@TommyTLC
so its at o,0 and 1180 wide o.O and almost 500 in height.
but we clearly dont see that.
can you try
qDebug() << "vis" << spacer->isVisible();

i was wondering if this happens due to
spacer->setMinimumWidth(1180);
as i have seen widgets do odd stuff when not room enough.

[TommyTLC]

@mrjj vis false

[mrjj]

@TommyTLC
ok so its get hidden for some odd reason.
do you use the do anything to the spacer variable after it has been inserted ?
also try
spacer->show();
after its gone. ( like via a button)
and lets see what happens.

[TommyTLC]

@mrjj This is all I do with the spacer:

QWidget* spacer = new QWidget();
spacer->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);
spacer->setMinimumWidth(1180);
m_fileToolBar->addWidget(spacer);

it gets created, I set the SizePolicy and the minimumWidth and then I assign it to the toolBar.

[mrjj]

@TommyTLC
Ok so its not hidden by user code.
Could you try a smaller minimum and see like
spacer->setMinimumWidth(200);

I know its not the goal but just to see if it still happens.

[VRonin]

@TommyTLC said in Toolbar spacer does not expand to the right corner:

in the >> I only see my m_aboutAction

you do not see the style combo either?

Did you overload resizeEvent?

Does the "Configuration" label on the left have something special?