[Interest] Problem with Embedding Translucent windows

[Dave Butler]

Hello list

I am trying to to embed a QWebview from one process into another process's
window.  I want the background of the containing window to show through the
contained webview.

----- test.cpp BEGIN ----
#define EMBEDDING 1

#include <QtCore>
#include <QtGui>
#include <QtWebKit>
//#include "stdafx.h"
#include <QX11EmbedWidget>
#include <stdio.h>
#include <string.h>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

#if EMBEDDING == 1

    QX11EmbedWidget *parent = new QX11EmbedWidget();

#else

    QWidget *parent = new QWidget();

#endif


    parent->show();

    QWebView *web = new QWebView(parent);

    parent->setAttribute(Qt::WA_TranslucentBackground);

    QWebPage *page = web->page();
    QPalette palette = page->palette();
    palette.setBrush(QPalette::Base, Qt::transparent);
    page->setPalette(palette);


#if EMBEDDING == 1

    parent->embedInto(atoi(argv[1]));

#endif

    page->currentFrame()->documentElement().setInnerXml("text");

    web->show();
    parent->show();

    return app.exec();
}

----- test.cpp END ----
----- test2.cpp BEGIN ----

#include <QtCore>
#include <QtGui>
#include <iostream>


int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QWidget *parent = new QWidget();

    parent->setStyleSheet("background-color: yellow;");

    parent->show();
    parent->move(100,100);


    std::cout << "Winid: " << parent->winId() << "\n";

    return app.exec();
}

----- test2.cpp END ----

I built these on Ubuntu 12.04 x86_64 with the following commands:

gcc test.cpp -I/usr/include/qt4/QtCore/  -I/usr/include/qt4/QtGui/
-I/usr/include/qt4/QtWebKit  -I/usr/include/qt4/ -lQtCore -lQtGui
-lQtWebKit -o test.out
gcc test2.cpp -I/usr/include/qt4/QtCore/  -I/usr/include/qt4/QtGui/
-I/usr/include/qt4/QtWebKit  -I/usr/include/qt4/ -lQtCore -lQtGui
-lQtWebKit -o test2.out

to run the code, first do `./test2.out` it should output a window ID, then
do `./test.out <winid>` where <winid> is the window id that is from the
test2.out output

If you don't have a compositing window manager running, you may have to
start xcompmgr

Instead of getting the result that I want, I just get a black square where
the background of the other application should show through....

To demonstrate that translucency works in non embedding situations, just
set EMBEDDING to 0 test.cpp

Please let me know if I am missing something or if there is a workaround.

Thanks
--Dave Butler

PS. I don't really know C/C++, just ported my PySide problem case over for
the benefit of this list. However, I should be able to Port ant C/C++
recommendations back to PySide

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