How do I hide the window title bar from QDockWidget

[lansing]

@mrjj

It hided the bar, but I lost the docking ability.

[mrjj]

@lansing
Did you try to dock it from code then ?

[lansing]

@mrjj

I don't know how to do it, couldn't find any example.

[mrjj]

@lansing
Hi
Do you read the docs?
https://doc.qt.io/qt-5/qdockwidget.html
Its always a good idea to skim over what features a class has.

Anyway, its
setFloating(false);
https://doc.qt.io/qt-5/qdockwidget.html#floating-prop

[lansing]

@mrjj

Yes I looked at that doc for over 10 minutes and I couldn't find it. There's nothing about dragging and moving the widget when the title bar was hidden.

This doesn't make the dockwidget draggable.

m_ui->myDockWidget->setTitleBarWidget(new QWidget(m_ui->myDockWidget));
m_ui->myDockWidget->setFloating(false);

[mrjj]

@lansing

Well it uses the title bar for dragging and you remove it so im not sure why you expect that to still work ?

But you can fix it with
https://stackoverflow.com/questions/18765918/how-to-create-a-draggable-borderless-and-titleless-top-level-window-in-qt

But why not just leave it alone if you want all the features it provides?

Maybe you could hide it when it get docked but then you cannot undock it again.

So not really sure what you really want as you cant both remove it and use it :=)

[tIk90wT]

If you only need it hide it from visibility, you could try to use the stylesheet to set dock widget title as the same color as the background. Customize dock widget. I'll post some pyside2 code to show what I mean.....

[tIk90wT]

I'm not able to reproduce the title bar as shown in this picture without knowing your code. . By default, I get no background. But here is the code

import sys
from PySide2.QtWidgets import QMainWindow, QWidget, QLabel, QDockWidget, QTabWidget, QApplication


class MainWindow(QMainWindow):
    def __init__(self):
        super(MainWindow, self).__init__()

        self.t1 = QLabel("tab 1")
        self.t2 = QLabel("tab 2")
        self.tabWidget = QTabWidget()
        self.tabWidget.addTab(self.t1, "Tab 1")
        self.tabWidget.addTab(self.t2, "Tab 2")

        self.dockWidget = QDockWidget()
        self.dockWidget.setWidget(self.tabWidget)

        self.dockWidget.setStyleSheet("QDockWidget:title {background-color: none;}")

        self.setCentralWidget(self.dockWidget)


if __name__ == '__main__':
    app = QApplication(sys.argv)
    mw = MainWindow()
    mw.show()
    sys.exit(app.exec_())

[lansing]

@tIk90wT said in How do I hide the window title bar from QTabWidget:

QDockWidget:title

Thanks, I also added border: 0px in the style and the window bar is gone.

However it looks weird with blank space on top and the control is uncomfortable, I missed a few time on my dragging because I missed clicking in the title areas.

[mrjj]

@lansing
Yep from a UX standpoint its just confusing.

[lansing]

@mrjj

I tired to move the dockWidgetContents up to make it looks better. I set the geometry of the starting y axis to negative, but it's not having any effect.

m_ui->dockWidgetContents ->setGeometry(0, -50,
         m_ui->dockWidgetContents ->width(), m_ui->dockWidgetContents ->height());

[mrjj]

@lansing
Do you use a layout inside ?
that space on top kinda fits with a layout default content margins.

[lansing]

@mrjj

My doctwidget layout

QDockWidget
----dockWidgetContents (vertical layout)
--------QTabWidget
------------QTextEdit
--------QTextEdit

The dockWidgetContents is the layout of the dockWidget.

[mrjj]

Ok
so on the vertical layout, set its margins to zero and see. default its 12 pixels.
Im not sure if that is the case but it could explain the huge gap.
setContentsMargins(0,0,0,0);

[lansing]

@mrjj

The top gap does become smaller, but when docked, I still couldn't move the contents into the title bar area.

[mrjj]

@lansing
Well when a widget is in a layout its not possible to move it.

you could try to use
https://doc.qt.io/qt-5/qdockwidget.html#titleBarWidget
and then setFixedHeight(1);
and see if that changes anything.

[lansing]

@mrjj

This will be worse because now it's even harder to click and drag the widget.

[mrjj]

@lansing
Yes that was expected.
But did it accept smaller size ?

[lansing]

@mrjj

My program crashed on run

QWidget * titleBar = m_ui->myrDockWidget->titleBarWidget();
titleBar->setFixedHeight(1);

[mrjj]

@lansing
ah sorry my bad
Docs says
"Returns the custom title bar widget set on the QDockWidget, or nullptr if no custom title bar has been set."

but we didnt anymore so its null. ok so not an option unless we do
m_ui->myDockWidget->setTitleBarWidget(new QWidget(m_ui->myDockWidget));

But you are right. Its too hard to hit if smaller so guess we just have to leave it.

I just wonder where that space comes from as the examples don't have it.