Programatically Hide Window Titlebar of Maximized Window From a Plasmoid

[Brian Helm]

Let me preface this post by saying that I have very little experience
programming in c++ and working with KDE development.

I am developing a plasmoid similar to
http://kde-apps.org/content/show.php/Yet+Another+Window+Control?content=139916.
Except I am mainly re-purposing it to only work with the active maximized
window. So if no windows are maximized then the plasmoid is hidden and it
only operates on the active maximized window.

That part I have covered and is working wonderfully.

The part that I want to get a grasp over is how to hide the titlebar of the
active maximized window. I know I can add "BorderlessMaximizedWindows=true"
to the user's kwinrc, but I wish to hide the titlebar programatically to
avoid messing with the user's settings and to also ensure that if the
plasmoid is removed that maximized windows will behave like they did before
the plasmoid was added.

I found that you can get and set window flags
http://doc.qt.nokia/latest/qt.html/#WindowType-enum through the QWidget
class. The flag I'm specifically wanting to set is Qt::FramelessWindowHint.
I'm supposed to be able to pass the window id of the active window to
QWidget's find() function and it will return a QWidget object so I can
manipulate the window flags. However, it always returns 0 (not found).

Here is the function that determines if the window is maximized, sets up the
plasmoid display, and is supposed to remove the titlebar. Any ideas on why
QWidget::find() always returns 0 even though the window ID passed to it
obviously belongs to a valid window?

void MaxWinControl::syncActiveWindow()
{
    m_syncDelay = false;
    bool applicationActive = false;

    foreach (QWidget *widget, QApplication::topLevelWidgets()) {
         if (widget->winId() == m_pendingActiveWindow ||
             widget->winId() == KWindowSystem::activeWindow()) {
             applicationActive = true;

             break;
         }
     }

    if (applicationActive && m_pendingActiveWindow > 0) {
        m_closeTask->hide();
        m_maximizeTask->hide();
        m_minimizeTask->hide();
   m_currentTaskTitle->hide();
   m_currentTaskIcon->hide();
    } else if (m_pendingActiveWindow > 0) {
      m_activeWindow = m_pendingActiveWindow;
      m_lastActiveWindow = m_pendingActiveWindow;
      KWindowInfo info = KWindowSystem::windowInfo(m_activeWindow,
NET::WMName|NET::WMState);

      if (info.state() & NET::Max) {
   QWidget *activeWidget = QWidget::find(m_activeWindow);

/* !! This always evaluates to 0 !! */
   if (activeWidget) {
          // store the previous flags for this window so we can restore them
when the window is unmaximized
     activeWidgetFlags = activeWidget->windowFlags();

     activeWidget->setWindowFlags(Qt::FramelessWindowHint);

     activeWidget->show();
   }
   if (m_showTitle) {
     m_currentTaskTitle->setText(info.name());
     m_currentTaskTitle->update();

     m_currentTaskTitle->show();
   }

        if (m_showClose) {
            m_closeTask->show();
        }
        if (m_showMaximize) {
            m_maximizeTask->show();
        }
        if (m_showMinimize) {
            m_minimizeTask->show();
        }

        if (m_showCurrentTaskIcon) {
       m_currentTaskIcon->setIcon(KWindowSystem::icon(m_activeWindow,
KIconLoader::SizeSmallMedium, KIconLoader::SizeSmallMedium));

       m_currentTaskIcon->show();
   }

        m_maximizeTask->setSvg("widgets/configuration-icons", "unmaximize");
      }
      else {
   m_closeTask->hide();
        m_maximizeTask->hide();
        m_minimizeTask->hide();
   m_currentTaskTitle->hide();
   m_currentTaskIcon->hide();
      }
    }

    m_pendingActiveWindow = 0;
}


in Christ,
Brian

~ Jesus answered, "I am the way and the truth and the life. No one comes to
the Father except through me." - John 14:6

 
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