source: trunk/tools/qmeegographicssystemhelper/qmeegooverlaywidget.cpp

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#include <QDebug>
#include <QEvent>
#include <QMouseEvent>
#include <QApplication>
#include <QDesktopWidget>
#include "qmeegooverlaywidget.h"
#include "qmeegographicssystemhelper.h"
#include "qmeegoruntime.h"

QMeeGoOverlayWidget::QMeeGoOverlayWidget(int surfaceWidth, int surfaceHeight, QWidget *parent) : QWidget(parent, 0), 
    sw(surfaceWidth), 
    sh(surfaceHeight)
{
    if (! QMeeGoGraphicsSystemHelper::isRunningMeeGo())
        qFatal("QMeeGoOverlayWidget can only be used when running with 'meego' graphics system!");

    const QRect desktop = QApplication::desktop()->screenGeometry(parent);

    QMeeGoRuntime::setSurfaceFixedSize(surfaceWidth, surfaceHeight);

    scaleW = sw / desktop.width();
    scaleH = sh / desktop.height();
    installEventFilter(this);
}

QPoint QMeeGoOverlayWidget::convertPoint(const QPoint &p)
{
    int x = p.x() * scaleW;
    int y = p.y() * scaleH;
    return QPoint(x, y);
}

void QMeeGoOverlayWidget::showEvent(QShowEvent *)
{
    QMeeGoRuntime::setSurfaceScaling(0, 0, width(), height());
}

bool QMeeGoOverlayWidget::eventFilter(QObject *, QEvent *event)
{
    if (event->spontaneous() == false)
        return false;

    switch(event->type()) {
        case QEvent::MouseButtonPress:
        case QEvent::MouseButtonRelease:
        {
            QMouseEvent *e = static_cast <QMouseEvent *>(event);
            QMouseEvent newEvent = QMouseEvent(e->type(), 
                                               convertPoint(e->pos()), 
                                               convertPoint(e->globalPos()), 
                                               e->button(), 
                                               e->buttons(), 
                                               e->modifiers());
            QCoreApplication::sendEvent(this, &newEvent);
            return true;
        }

        default:
            return false;
    }
}