fakedecoration_with_shadows.cpp

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/*
    KWin - the KDE window manager
    This file is part of the KDE project.
 
    SPDX-FileCopyrightText: 2018 Vlad Zahorodnii <vlad.zahorodnii@kde.org>
 
    SPDX-License-Identifier: GPL-2.0-or-later
*/
 
#include <QPainter>
 
#include <KDecoration2/Decoration>
#include <KPluginFactory>
 
class FakeDecoWithShadows : public KDecoration2::Decoration
{
    Q_OBJECT
 
public:
    explicit FakeDecoWithShadows(QObject *parent = nullptr, const QVariantList &args = QVariantList())
        : Decoration(parent, args)
    {
    }
    ~FakeDecoWithShadows() override
    {
    }
 
    void paint(QPainter *painter, const QRect &repaintRegion) override
    {
    }
 
public Q_SLOTS:
    bool init() override
    {
        const int shadowSize = 128;
        const int offsetTop = 64;
        const int offsetLeft = 48;
        const QRect shadowRect(0, 0, 4 * shadowSize + 1, 4 * shadowSize + 1);
 
        QImage shadowTexture(shadowRect.size(), QImage::Format_ARGB32_Premultiplied);
        shadowTexture.fill(Qt::transparent);
 
        const QMargins padding(
            shadowSize - offsetLeft,
            shadowSize - offsetTop,
            shadowSize + offsetLeft,
            shadowSize + offsetTop);
 
        auto decoShadow = std::make_shared<KDecoration2::DecorationShadow>();
        decoShadow->setPadding(padding);
        decoShadow->setInnerShadowRect(QRect(shadowRect.center(), QSize(1, 1)));
        decoShadow->setShadow(shadowTexture);
 
        setShadow(decoShadow);
        return true;
    }
};
 
K_PLUGIN_FACTORY_WITH_JSON(
    FakeDecoWithShadowsFactory,
    "fakedecoration_with_shadows.json",
    registerPlugin<FakeDecoWithShadows>();)
 
#include "fakedecoration_with_shadows.moc"