How to change cornerWidget style in QTabWidget?

[Eugene Zelenko]

Sorry for delay with answer. Screenshot is attached. Qt version is 5.14.2.

Snippet of code which creates tool button and add it as corner widget:

    list_tool_button_ = new QToolButton(this);
    list_tool_button_->setIcon(QIcon(":/images/resources/tabs_list.png"));
    list_tool_button_->setPopupMode(QToolButton::InstantPopup);
    list_tool_button_->setToolButtonStyle(Qt::ToolButtonIconOnly);
    setCornerWidget(list_tool_button_, Qt::TopRightCorner);

[SGaist]

Can you show the look you would like it to have ?

[Eugene Zelenko]

Desired result: all buttons should have same height and margins from top and bottom. Tool button margins from left and right could be changes when tool button is inserted into container widget with QHBoxLayout. More precisely, I'd like to change size/margins of tool button, not scroll buttons.

[mrjj]

@Eugene-Zelenko
Hi
You can set a minimum size to it
list_tool_button_->setMinimumSize(32,64);
but its different pr platform so not sure its what you want.

[Eugene Zelenko]

@mrjj said in How to change cornerWidget style in QTabWidget?:

list_tool_button_->setMinimumSize(32,64);

I tried this. Button was enlarged, but misaligned.

My application also has command-line option to set QT_SCALE_FACTOR, so fixed size is not best solution.

Does QTabWidget has style options that affect corner widgets?

[mrjj]

@Eugene-Zelenko said in How to change cornerWidget style in QTabWidget?:

Does QTabWidget has style options that affect corner widgets?

Not that i have seen. basically its just a widget.

[Christian Ehrlicher]

Internally the corner widgets get the correct geometry. I guess it's due to the fact that the QToolButton has size constraints. Try to set them to expanding.

[Eugene Zelenko]

No, changing vertical size policy to expanding didn't help.

Probably changing QTabWidget::initStyleOption could help, but method is not virtual :-(

[Christian Ehrlicher]

@Eugene-Zelenko said in How to change cornerWidget style in QTabWidget?:

No, changing vertical size policy to expanding didn't help.

Maybe there is a min/max size on it. First try to use a simple QWidget or QLabel to see if it expands correctly.

[Eugene Zelenko]

@Christian-Ehrlicher

I tried to create QLineEdit, because it's more noticeable an it behave similar to QToolButton:

Code is:

    auto* line_edit = new QLineEdit(this);

    line_edit->setSizePolicy(QSizePolicy(QSizePolicy::Fixed, QSizePolicy::Expanding));
    line_edit->setText(tr("Test"));
    line_edit->setMinimumHeight(tabBar()->height() - 2);
    setCornerWidget(line_edit, Qt::TopRightCorner);

[Eugene Zelenko]

I was able to get result very close to what I wanted to 1 pixel from bottom:

Code is:

    auto* container = new QWidget(this);

    container->setFixedHeight(tabBar()->height());
    container->setSizePolicy(QSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed));

    auto* layout = new QHBoxLayout(container);

    layout->setContentsMargins(1, 0, 1, 0);

    list_tool_button_ = new QToolButton(this);
    list_tool_button_->setFixedHeight(tabBar()->height());
    list_tool_button_->setIcon(QIcon(":/images/resources/tabs_list.png"));
    list_tool_button_->setPopupMode(QToolButton::InstantPopup);
    list_tool_button_->setSizePolicy(QSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed));
    list_tool_button_->setToolButtonStyle(Qt::ToolButtonIconOnly);
   
    layout->addWidget(list_tool_button_);
    setCornerWidget(container, Qt::TopRightCorner);

[abiabi]

you added setContentsMargins(1, 0, 1, 0) on QHBoxLayout .
so toolbutton expanded in full size. thanks for this answer it worked for me.