kcmplugin: Do not use d-ptr for trivial members that are fully qualified

Also, make this for the most part header only, because it is just a utility class.
We could make this entirely header only, but it is not worth it.

core/kdeconnectpluginconfig.cpp

@@ -21,13 +21,15 @@ struct KdeConnectPluginConfigPrivate {
     QDBusMessage m_signal;
 };
 
-KdeConnectPluginConfig::KdeConnectPluginConfig()
-    : d(new KdeConnectPluginConfigPrivate())
+KdeConnectPluginConfig::KdeConnectPluginConfig(QObject *parent)
+    : QObject(parent)
+    , d(new KdeConnectPluginConfigPrivate())
 {
 }
 
-KdeConnectPluginConfig::KdeConnectPluginConfig(const QString &deviceId, const QString &pluginName)
-    : d(new KdeConnectPluginConfigPrivate())
+KdeConnectPluginConfig::KdeConnectPluginConfig(const QString &deviceId, const QString &pluginName, QObject *parent)
+    : QObject(parent)
+    , d(new KdeConnectPluginConfigPrivate())
 {
     d->m_configDir = KdeConnectConfig::instance().pluginConfigDir(deviceId, pluginName);
     QDir().mkpath(d->m_configDir.path());

core/kdeconnectpluginconfig.h

@@ -25,8 +25,8 @@ class KDECONNECTCORE_EXPORT KdeConnectPluginConfig : public QObject
     Q_PROPERTY(QString pluginName READ pluginName WRITE setPluginName NOTIFY configChanged)
 
 public:
-    KdeConnectPluginConfig();
-    KdeConnectPluginConfig(const QString &deviceId, const QString &pluginName);
+    explicit KdeConnectPluginConfig(QObject *parent = nullptr);
+    explicit KdeConnectPluginConfig(const QString &deviceId, const QString &pluginName, QObject *parent = nullptr);
     ~KdeConnectPluginConfig() override;
 
     /**

kcmplugin/kdeconnectpluginkcm.cpp

@@ -6,42 +6,17 @@
 
 #include "kdeconnectpluginkcm.h"
 
-struct KdeConnectPluginKcmPrivate {
-    QString m_deviceId;
-    QString m_pluginName;
-    KdeConnectPluginConfig *m_config = nullptr;
-};
-
 KdeConnectPluginKcm::KdeConnectPluginKcm(QObject *parent, const KPluginMetaData &data, const QVariantList &args)
 #if QT_VERSION_MAJOR < 6
     : KCModule(qobject_cast<QWidget *>(parent), args)
 #else
     : KCModule(parent)
 #endif
-    , d(new KdeConnectPluginKcmPrivate())
+    , m_deviceId(args.at(0).toString())
+    // The plugin name is the KCMs ID with the postfix removed
+    , m_config(new KdeConnectPluginConfig(m_deviceId, args.at(1).toString().remove(QLatin1String("_config")), this))
 {
     Q_ASSERT(data.isValid()); // Even if we have empty metadata, it should be valid!
-    d->m_deviceId = args.at(0).toString();
-    const static QRegularExpression removeConfigPostfix(QStringLiteral("_config$"));
-    d->m_pluginName = data.pluginId().remove(removeConfigPostfix);
-
-    // The parent of the config should be the plugin itself
-    d->m_config = new KdeConnectPluginConfig(d->m_deviceId, d->m_pluginName);
-}
-
-KdeConnectPluginKcm::~KdeConnectPluginKcm()
-{
-    delete d->m_config;
-}
-
-KdeConnectPluginConfig *KdeConnectPluginKcm::config() const
-{
-    return d->m_config;
-}
-
-QString KdeConnectPluginKcm::deviceId() const
-{
-    return d->m_deviceId;
 }
 
 #include "moc_kdeconnectpluginkcm.cpp"

kcmplugin/kdeconnectpluginkcm.h

@@ -4,8 +4,7 @@
  * SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
  */
 
-#ifndef KDECONNECTPLUGINKCM_H
-#define KDECONNECTPLUGINKCM_H
+#pragma once
 
 #include <KCModule>
 #include <KPluginMetaData> // Not in KCModule header of older KF5 versions
@@ -14,8 +13,6 @@
 #include "core/kdeconnectpluginconfig.h"
 #include "kdeconnectpluginkcm_export.h"
 
-struct KdeConnectPluginKcmPrivate;
-
 /**
  * Inheriting your plugin's KCM from this class gets you a easy way to share
  * configuration values between the KCM and the plugin.
@@ -25,18 +22,23 @@ class KDECONNECTPLUGINKCM_EXPORT KdeConnectPluginKcm : public KCModule
     Q_OBJECT
 
 public:
-    KdeConnectPluginKcm(QObject *parent, const KPluginMetaData &data, const QVariantList &args);
-    ~KdeConnectPluginKcm() override;
+    explicit KdeConnectPluginKcm(QObject *parent, const KPluginMetaData &data, const QVariantList &args);
 
     /**
      * The device this kcm is instantiated for
      */
-    QString deviceId() const;
+    QString deviceId() const
+    {
+        return m_deviceId;
+    }
 
     /**
      * The object where to save the config, so the plugin can access it
      */
-    KdeConnectPluginConfig *config() const;
+    KdeConnectPluginConfig *config() const
+    {
+        return m_config;
+    }
 
 #if KCONFIGWIDGETS_VERSION < QT_VERSION_CHECK(5, 105, 0)
     QWidget *widget()
@@ -46,7 +48,7 @@ public:
 #endif
 
 private:
-    QScopedPointer<KdeConnectPluginKcmPrivate> d;
+    const QString m_deviceId;
+    const QString m_pluginName;
+    KdeConnectPluginConfig *const m_config;
 };
-
-#endif