overlaywidget.cpp

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#include "overlaywidget.h"
#include <QResizeEvent>
#include <QEvent>

using namespace KPIM;

OverlayWidget::OverlayWidget( QWidget* alignWidget, QWidget* parent, const char* name )
    : KHBox( parent ), mAlignWidget( 0 )
{
    setObjectName(QLatin1String(name));
    setAlignWidget( alignWidget );
}

OverlayWidget::~OverlayWidget()
{
}

void OverlayWidget::reposition()
{
    if ( !mAlignWidget )
        return;
    // p is in the alignWidget's coordinates
    QPoint p;
    // We are always above the alignWidget, right-aligned with it.
    p.setX( mAlignWidget->width() - width() );
    p.setY( -height() );
    // Position in the toplevelwidget's coordinates
    QPoint pTopLevel = mAlignWidget->mapTo( topLevelWidget(), p );
    // Position in the widget's parentWidget coordinates
    QPoint pParent = parentWidget()->mapFrom( topLevelWidget(), pTopLevel );
    // Move 'this' to that position.
    move( pParent );
}

void OverlayWidget::setAlignWidget( QWidget * w )
{
    if (w == mAlignWidget)
        return;

    if (mAlignWidget)
        mAlignWidget->removeEventFilter(this);

    mAlignWidget = w;

    if (mAlignWidget)
        mAlignWidget->installEventFilter(this);

    reposition();
}

bool OverlayWidget::eventFilter( QObject* o, QEvent* e)
{
    if ( o == mAlignWidget &&
         ( e->type() == QEvent::Move || e->type() == QEvent::Resize ) ) {
        reposition();
    }
    return QFrame::eventFilter(o,e);
}

void OverlayWidget::resizeEvent( QResizeEvent* ev )
{
    reposition();
    QFrame::resizeEvent( ev );
}