feat: add isReadOnly method to DConfig

docs/global/dconfig.zh_CN.dox

@@ -63,6 +63,14 @@
 @sa DBusBackend::reset()
 @sa QSettingBackend::reset()
 
+@fn bool Dtk::Core::DConfigBackend::isReadOnly(const QString &key)
+@brief 检测指定配置项是否为只读
+@param[in] key 配置项名称
+@return 如果配置项为只读返回true，否则返回false
+@sa DConfig::isReadOnly()
+@sa FileBackend::isReadOnly()
+@sa DBusBackend::isReadOnly()
+
 @fn QString Dtk::Core::DConfigBackend::name() const = 0
 @brief 后端配置的唯一标识
 @sa FileBackend::name()
@@ -384,6 +392,11 @@ sudo make install
 @brief 设置其配置项对应的默认值,此值为经过override机制覆盖后的值,不一定为此配置文件中meta中定义的值
 @param[in] key 配置项名称
 
+@fn bool Dtk::Core::DConfig::isReadOnly(const QString &key)
+@brief 检测指定配置项是否为只读
+@param[in] key 配置项名称
+@return 如果配置项为只读返回true，否则返回false
+
 @fn QString Dtk::Core::DConfig::name()
 @brief 返回配置文件名称
 

include/global/dconfig.h

@@ -23,6 +23,7 @@ class DConfigBackend {
     virtual void reset(const QString &key) { setValue(key, QVariant());}
     virtual QString name() const {return QString("");}
     virtual bool isDefaultValue(const QString &/*key*/) const { return true; }
+    virtual bool isReadOnly(const QString &/*key*/) const { return false; }
 };
 
 class DConfigPrivate;
@@ -61,6 +62,7 @@ class LIBDTKCORESHARED_EXPORT DConfig : public QObject, public DObject
     QVariant value(const QString &key, const QVariant &fallback = QVariant()) const;
     void setValue(const QString &key, const QVariant &value);
     void reset(const QString &key);
+    bool isReadOnly(const QString &key) const;
 
     QString name() const;
     QString subpath() const;

src/dconfig.cpp

@@ -82,6 +82,13 @@ static QString NoAppId;
     @sa DConfig::reset()
  */
 
+ /*!
+ @~english
+     @fn bool DConfigBackend::isReadOnly(const QString &key) const = 0
+
+     @sa DConfig::isReadOnly()
+ */
+
 /*!
 @~english
     @fn QString DConfigBackend::name() const = 0
@@ -230,6 +237,12 @@ class Q_DECL_HIDDEN FileBackend : public DConfigBackend
         setValue(key, QVariant());
     }
 
+    virtual bool isReadOnly(const QString &key) const override
+    {
+        const auto vc = configFile->meta()->permissions(key);
+        return vc == DConfigFile::ReadOnly;
+    }
+
     virtual QString name() const override
     {
         return QString("FileBackend");
@@ -425,6 +438,18 @@ class Q_DECL_HIDDEN DBusBackend : public DConfigBackend
                              << ", error message:" << reply.error();
     }
 
+    virtual bool isReadOnly(const QString &key) const override
+    {
+        auto reply = config->permissions(key);
+        reply.waitForFinished();
+        if (reply.isError()) {
+            qWarning() << "Failed to call `permissions`, key:" << key
+                       << ", error message:" << reply.error().message();
+            return false;
+        }
+        return reply.value() == QLatin1String("readonly");
+    }
+
     virtual QString name() const override
     {
         return QString("DBusBackend");
@@ -821,6 +846,21 @@ void DConfig::reset(const QString &key)
     d->backend->reset(key);
 }
 
+/*!
+ * @~english
+ * @brief Check whether the configuration item is read-only
+ * @param key Configuration Item Name
+ * @return Return `true` if the configuration item is read-only, otherwise return `false`
+ */
+bool DConfig::isReadOnly(const QString &key) const
+{
+    D_DC(DConfig);
+    if (d->invalid())
+        return false;
+
+    return d->backend->isReadOnly(key);
+}
+
 /*!
 @~english
  * @brief Return configuration file name

tests/data/dconf-example.meta.json

@@ -105,6 +105,26 @@
       "description": "I am public configure",
       "permissions": "readwrite",
       "visibility": "private"
+    },
+    "readwrite": {
+      "value": true,
+      "serial": 0,
+      "flags": [],
+      "name": "readwrite configure",
+      "name[zh_CN]": "我是可读写配置",
+      "description": "I am a readwrite configure",
+      "permissions": "readwrite",
+      "visibility": "private"
+    },
+    "readonly": {
+      "value": true,
+      "serial": 0,
+      "flags": [],
+      "name": "readonly configure",
+      "name[zh_CN]": "我是只读配置",
+      "description": "I am a readonly configure",
+      "permissions": "readonly",
+      "visibility": "private"
     }
   }
 }

tests/ut_dconfig.cpp

@@ -226,3 +226,14 @@ TEST_F(ut_DConfig, isDefaultValue) {
         EXPECT_EQ(config.isDefaultValue("key2"), true);
     }
 }
+
+TEST_F(ut_DConfig, isReadOnly) {
+
+    FileCopyGuard guard(":/data/dconf-example.meta.json", metaFilePath);
+    {
+        DConfig config(FILE_NAME);
+        EXPECT_TRUE(config.isValid());
+        ASSERT_EQ(config.isReadOnly("readwrite"), false);
+        EXPECT_EQ(config.isReadOnly("readonly"), true);
+    }
+}