Set a Label on top of all others

danga96

hello to the whole community Qt Forum,
I have a Label that must necessarily be placed above all the windows of my editor.
These are all the combinations I've tried:

QLabel *label = new QLabel(myEditor);
label->topLevelWidget();
label->setWindowFlags(Qt::WindowStaysOnTopHint);
label->raise();

but none of these, either individually or all together, work;
Thanks in advance :)

Chris Kawa

topLevelWidget() is a getter, it sets nothing so is useless for what you're trying to do
setWindowFlags(Qt::WindowStaysOnTopHint) is the right flag, but your widget is not a window, so it has no effect.
raise() is also used on windows and your label is not.

First of all make your label a window and then you can use that WindowStaysOnTopHint:

QLabel *label = new QLabel(myEditor, Qt::Window | Qt::WindowStaysOnTopHint);
label->show();

If you don't want the window frame around the label add another flag to that constructor: Qt::FramelessWindowHint.

danga96

@Chris-Kawa
Thanks for the reply; but if I put the Qt :: Windows flag I can no longer use my editor as a reference for the Label, because now I do it outside the window.

Chris Kawa

Ok, I'm confused about what you're trying to do then. You said you want it above all other windows in your app. For that it needs to be a window too.
Can you describe better what you imagine the result would look like?

J.Hilk

@danga96

raise() actually should work fine. As it should raise the widget on the top of the parent widget's stack.

But it should also be not needed, the last created child/sibling widget is by default on top of all others.

My guess is, your label has no size, as it's not part of a layout.

QLabel *label = new QLabel(myEditor);
label->resize(myEditor->size());
label->raise();
label->show(); //just in case, should be unnecessary

danga96

@Chris-Kawa ,@J-Hilk
Thank you for your reply.
I try to explain myself better: I have a Label that I must have in my texteditor in a certain position, using the "label-> move (x, y)" instruction, these x and y are not absolute but relative to the editor; so if I can't use these coordinates, how can I convert them absolutely?

Chris Kawa

@danga96 said in Set a Label on top of all others:

so if I can't use these coordinates, how can I convert them absolutely?

You can use mapToGlobal() on the widget these coordinates are relative to, so something like

label->move(textEditor->mapToGlobal(QPoint(x, y)));

danga96

@Chris-Kawa
Thanks, but now every time I move the Label it is like updating the window, and the editor cursor loses its position forcing the user to reposition it with a click of the mouse; is there any flag that avoids this?