Painting: How to control what's in the foreground?

[vermarajeev]

I dont know whether I understood your problem correctly. When you move QLabel, do you want it to be seen at top of other widgets. i.e whenever QLabel has a mouse on it, QLabel should be seen at top of other widgets. If that is what you are looking for then have a look at Examples->QWidgets->ToolTips. Might help.

Thanks

[Mister_Crac]

I dont know whether I understood your problem correctly. When you move QLabel, do you want it to be seen at top of other widgets.

I want this QLabel to be in front of the other QWidgets all of the time.

i.e whenever QLabel has a mouse on it, QLabel should be seen at top of other widgets. If that is what you are looking for then have a look at Examples->QWidgets->ToolTips. Might help.

I think my problem boils down to this: If you have two QWidgets that overlap, how do you control which one of the two is in the foreground? This seems to be complicated by the fact that the one QWidget (the QLabel which must be freely movable) is not part of a layout, while the other QWidgets (which are supposed to be visible, but "behind" the moving QLabel) are.

[jpn]

I have done this and indeed, I do get an additional black console window now, but no text ever appears inside of it. Even if I call dumpObjectTree(). Are you sure I do not need to re-compile Qt?

No, re-compiling Qt is not necessary. Sorry, I have no idea what's the problem with no text appearing, though. Did you clean and rebuild the whole project?

I think my problem boils down to this: If you have two QWidgets that overlap, how do you control which one of the two is in the foreground?

It's all about parenting widgets correctly. The order of sibling child widgets can be changed with raise() and lower() as mentioned in the beginning of the thread.

Edit: This is why I asked for dumpObjectTree() output. It will show the actual hierarchy of the object tree.

[Mister_Crac]

No, re-compiling Qt is not necessary. Sorry, I have no idea what's the problem with no text appearing, though. Did you clean and rebuild the whole project?

Yes, I deleted the "release" directory and compiled it from scratch. I don't use a fancy IDE, just Vim 7.0 (gvim) as the editor and compiling at the console. Old school!
Maybe I could redirect the stderror output to a file?

EDIT:
I just realised that I made a mistake. For the QLabel, instead of doing this:

textDisplay = new QLabel("Enter Text here", this);

textDisplay = new QLabel("Enter Text here", this);

To copy to clipboard, switch view to plain text mode 

I had left out the "this", thus making the QLabel not a child Widget of the application window.
But still, even now that I have changed it, calling raise() seems to do nothing at all. Of course, there is always the possibility that I am making another stupid mistake...

[Mister_Crac]

Okay, so I finally managed to call dumpObjectTree() and get an output. Turns out that indeed my Qt was not compiled for debugging, but now it is. Here is what I get, I simplified it because the output was so long. Look at this screenshot to see how it looks now - and still my QLabel is in the background. :-(

Rechner::
    QWidget::
        QLabel::
            QTextDocument::
                QTextDocumentLayout::
                    QTextImageHandler::
                QTextFrame::
        QLabel::
            QTextDocument::
                QTextDocumentLayout::
                    QTextImageHandler::
                QTextFrame::
        QLabel::
            QTextDocument::
                QTextDocumentLayout::
                    QTextImageHandler::
                QTextFrame::
        QLabel::
            QTextDocument::
                QTextDocumentLayout::
                    QTextImageHandler::
                QTextFrame::
        QLabel::
            QTextDocument::
                QTextDocumentLayout::
                    QTextImageHandler::
                QTextFrame::
        QLabel::
            QTextDocument::
                QTextDocumentLayout::
                    QTextImageHandler::
                QTextFrame::
        QLabel::
            QTextDocument::
                QTextDocumentLayout::
                    QTextImageHandler::
                QTextFrame::
    QGridLayout::
    QLabel::
        QTextDocument::
            QTextDocumentLayout::
                QTextImageHandler::
            QTextFrame::
    QTimer::
    QTimer::
    QTimer::
    QTimer::
    QTimer::

Rechner::
    QWidget::
        QLabel::
            QTextDocument::
                QTextDocumentLayout::
                    QTextImageHandler::
                QTextFrame::
        QLabel::
            QTextDocument::
                QTextDocumentLayout::
                    QTextImageHandler::
                QTextFrame::
        QLabel::
            QTextDocument::
                QTextDocumentLayout::
                    QTextImageHandler::
                QTextFrame::
        QLabel::
            QTextDocument::
                QTextDocumentLayout::
                    QTextImageHandler::
                QTextFrame::
        QLabel::
            QTextDocument::
                QTextDocumentLayout::
                    QTextImageHandler::
                QTextFrame::
        QLabel::
            QTextDocument::
                QTextDocumentLayout::
                    QTextImageHandler::
                QTextFrame::
        QLabel::
            QTextDocument::
                QTextDocumentLayout::
                    QTextImageHandler::
                QTextFrame::
    QGridLayout::
    QLabel::
        QTextDocument::
            QTextDocumentLayout::
                QTextImageHandler::
            QTextFrame::
    QTimer::
    QTimer::
    QTimer::
    QTimer::
    QTimer::

To copy to clipboard, switch view to plain text mode