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qt'QHideDock (./qt-2.1.0/src/widgets/qmainwindow.cpp:780)

class QHideDock : public QWidget
{
public:
    QHideDock( QMainWindow *parent, QMainWindowPrivate *p ) : QWidget( parent ) {
	hide();
	setFixedHeight( style().toolBarHandleExtend() );
	d = p;
	pressedHandle = -1;
	pressed = FALSE;
	setMouseTracking( TRUE );
	win = parent;
	tip = new QHideToolTip( this );
    }
    ~QHideDock() { delete tip; }

protected:
    void paintEvent( QPaintEvent *e ) {
	if ( !d->hidden || d->hidden->isEmpty() )
	    return;
	QPainter p( this );
	p.setClipRegion( e->rect() );
	p.fillRect( e->rect(), colorGroup().brush( QColorGroup::Background ) );
	QMainWindowPrivate::ToolBar *tb;
	int x = 0;
	int i = 0;
	for ( tb = d->hidden->first(); tb; tb = d->hidden->next(), ++i ) {
	    if ( !tb->t->isVisible() )
		continue;
	    style().drawToolBarHandle( &p, QRect( x, 0, 30, 10 ), Qt::Vertical,
				       i == pressedHandle, colorGroup(), TRUE );
	    x += 30;
	}
    }

    void mousePressEvent( QMouseEvent *e ) {
	pressed = TRUE;
	if ( !d->hidden || d->hidden->isEmpty() )
	    return;
	mouseMoveEvent( e );

	if ( e->button() == RightButton && win->isDockMenuEnabled() ) {
	    if ( pressedHandle != -1 ) {
		QMainWindowPrivate::ToolBar *tb = d->hidden->at( pressedHandle );
		QPopupMenu menu( this );
		int left = menu.insertItem( QMainWindow::tr( "&Left" ) );
		menu.setItemEnabled( left, win->isDockEnabled( QMainWindow::Left )
				     && win->isDockEnabled( tb->t, QMainWindow::Left ) );
		int right = menu.insertItem( QMainWindow::tr( "&Right" ) );
		menu.setItemEnabled( left, win->isDockEnabled( QMainWindow::Right )
				     && win->isDockEnabled( tb->t, QMainWindow::Right ) );
		int top = menu.insertItem( QMainWindow::tr( "&Top" ) );
		menu.setItemEnabled( left, win->isDockEnabled( QMainWindow::Top )
				     && win->isDockEnabled( tb->t, QMainWindow::Top ) );
		int bottom = menu.insertItem( QMainWindow::tr( "&Bottom" ) );
		menu.setItemEnabled( left, win->isDockEnabled( QMainWindow::Bottom )
				     && win->isDockEnabled( tb->t, QMainWindow::Bottom ) );
		menu.insertSeparator();
		int hide = menu.insertItem( QMainWindow::tr( "R&estore" ) );
		QMainWindow::ToolBarDock dock = tb->oldDock;
		menu.setItemEnabled( left, win->isDockEnabled( dock )
				     && win->isDockEnabled( tb->t, dock ) );
		int res = menu.exec( e->globalPos() );
		pressed = FALSE;
		pressedHandle = -1;
		repaint( TRUE );
		if ( res == left )
		    win->moveToolBar( tb->t, QMainWindow::Left );
		else if ( res == right )
		    win->moveToolBar( tb->t, QMainWindow::Right );
		else if ( res == top )
		    win->moveToolBar( tb->t, QMainWindow::Top );
		else if ( res == bottom )
		    win->moveToolBar( tb->t, QMainWindow::Bottom );
		else if ( res == hide )
		    win->moveToolBar( tb->t, tb->oldDock, tb->nl, tb->oldIndex, tb->extraOffset );
		else
		    return;
		tb->t->show();
	    } else {
		win->rightMouseButtonMenu( e->globalPos() );
	    }
	}
    }

    void mouseMoveEvent( QMouseEvent *e ) {
	if ( !d->hidden || d->hidden->isEmpty() )
	    return;
	if ( !pressed )
	    return;
	QMainWindowPrivate::ToolBar *tb;
	int x = 0;
	int i = 0;
	if ( e->y() >= 0 && e->y() <= height() ) {
	    for ( tb = d->hidden->first(); tb; tb = d->hidden->next(), ++i ) {
		if ( !tb->t->isVisible() )
		    continue;
		if ( e->x() >= x && e->x() <= x + 30 ) {
		    int old = pressedHandle;
		    pressedHandle = i;
		    if ( pressedHandle != old )
			repaint( TRUE );
		    return;
		}
		x += 30;
	    }
	}
	int old = pressedHandle;
	pressedHandle = -1;
	if ( old != -1 )
	    repaint( TRUE );
    }

    void mouseReleaseEvent( QMouseEvent *e ) {
	pressed = FALSE;
	if ( pressedHandle == -1 )
	    return;
       	if ( !d->hidden || d->hidden->isEmpty() )
	    return;
	if ( e->button() == LeftButton ) {
	    if ( e->y() >= 0 && e->y() <= height() ) {
		QMainWindowPrivate::ToolBar *tb = d->hidden->at( pressedHandle );
		tb->t->show();
		win->moveToolBar( tb->t, tb->oldDock, tb->nl, tb->oldIndex, tb->extraOffset );
	    }
	}
	pressedHandle = -1;
	repaint( TRUE );
    }

private:
    QMainWindowPrivate *d;
    QMainWindow *win;
    int pressedHandle;
    bool pressed;
    QHideToolTip *tip;

    friend class QHideToolTip;

};