qt-material-widgets/components/materiallib/qtmaterialoverlaywidget.cpp

#include <lib/qtmaterialoverlaywidget.h>
#include <QEvent>

/*!
 *  @class QtMaterialOverlayWidget
 *  @internal
 */

QtMaterialOverlayWidget::QtMaterialOverlayWidget(QWidget *parent)
    : QWidget(parent)
{
    if (parent) {
        parent->installEventFilter(this);
    }
}

QtMaterialOverlayWidget::~QtMaterialOverlayWidget() {}

/*!
 *  @reimp
 */
bool QtMaterialOverlayWidget::event(QEvent *event)
{
    if (!parent()) {
        return QWidget::event(event);
    }
    switch (event->type()) {
        case QEvent::ParentChange: {
            parent()->installEventFilter(this);
            setGeometry(overlayGeometry());
            break;
        }
        case QEvent::ParentAboutToChange: {
            parent()->removeEventFilter(this);
            break;
        }
        default:
            break;
    }
    return QWidget::event(event);
}

/*!
 *  @reimp
 */
bool QtMaterialOverlayWidget::eventFilter(QObject *obj, QEvent *event)
{
    switch (event->type()) {
        case QEvent::Move:
        case QEvent::Resize:
            setGeometry(overlayGeometry());
            break;
        default:
            break;
    }
    return QWidget::eventFilter(obj, event);
}

QRect QtMaterialOverlayWidget::overlayGeometry() const
{
    QWidget *widget = parentWidget();
    if (!widget) {
        return QRect();
    }
    return widget->rect();
}