src/ui/OverlayWidget.cpp


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// SPDX-FileCopyrightText: 2021 Nheko Contributors
//
// SPDX-License-Identifier: GPL-3.0-or-later

#include "OverlayWidget.h"

#include <QPainter>
#include <QStyleOption>

OverlayWidget::OverlayWidget(QWidget *parent)
  : QWidget(parent)
{
    if (parent) {
        parent->installEventFilter(this);
        setGeometry(overlayGeometry());
        raise();
    }
}

bool
OverlayWidget::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);
}

bool
OverlayWidget::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
OverlayWidget::overlayGeometry() const
{
    QWidget *widget = parentWidget();

    if (!widget)
        return QRect();

    return widget->rect();
}

void
OverlayWidget::paintEvent(QPaintEvent *event)
{
    Q_UNUSED(event);

    QStyleOption opt;
    opt.initFrom(this);
    QPainter p(this);
    style()->drawPrimitive(QStyle::PE_Widget, &opt, &p, this);
}