ZoneCache.h

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// SPDX-FileCopyrightText: 2026 fuddlesworth
// SPDX-License-Identifier: LGPL-2.1-or-later
 
#pragma once
 
#include <PhosphorIdentity/WindowId.h>
 
#include <QHash>
#include <QString>
 
namespace PhosphorCompositor {
 
class ZoneCache
{
public:
    QString zoneForWindow(const QString& windowId) const
    {
        return m_byInstance.value(::PhosphorIdentity::WindowId::extractInstanceId(windowId));
    }
 
    bool isSnapped(const QString& windowId) const
    {
        return !zoneForWindow(windowId).isEmpty();
    }
 
    bool setZone(const QString& windowId, const QString& zoneId)
    {
        const QString instanceId = ::PhosphorIdentity::WindowId::extractInstanceId(windowId);
        // A composite with an empty instanceId ("appId|") is malformed: keying it
        // would alias every empty-instance window onto one wildcard slot. Ignore.
        if (instanceId.isEmpty()) {
            return false;
        }
        if (zoneId.isEmpty()) {
            return m_byInstance.remove(instanceId) > 0;
        }
        const auto it = m_byInstance.constFind(instanceId);
        if (it != m_byInstance.constEnd() && it.value() == zoneId) {
            return false;
        }
        m_byInstance.insert(instanceId, zoneId);
        return true;
    }
 
    bool remove(const QString& windowId)
    {
        return m_byInstance.remove(::PhosphorIdentity::WindowId::extractInstanceId(windowId)) > 0;
    }
 
    void clear()
    {
        m_byInstance.clear();
    }
 
    int size() const
    {
        return m_byInstance.size();
    }
 
private:
    QHash<QString, QString> m_byInstance; 
};
 
} // namespace PhosphorCompositor