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/* Copyright 2013 MultiMC Contributors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef SETTINGSOBJECT_H
#define SETTINGSOBJECT_H
#include <QObject>
#include <QMap>
#include "libsettings_config.h"
class Setting;
/*!
* \brief The SettingsObject handles communicating settings between the application and a settings file.
* The class keeps a list of Setting objects. Each Setting object represents one
* of the application's settings. These Setting objects are registered with
* a SettingsObject and can be managed similarly to the way a list works.
*
* \author Andrew Okin
* \date 2/22/2013
*
* \sa Setting
*/
class LIBSETTINGS_EXPORT SettingsObject : public QObject
{
Q_OBJECT
public:
explicit SettingsObject(QObject *parent = 0);
/*!
* \brief Registers the given setting with this SettingsObject and connects the necessary signals.
* This will fail if there is already a setting with the same ID as
* the one that is being registered.
* \note Registering a setting object causes the SettingsObject to take ownership
* of the object. This means that setting's parent will be set to the object
* it was registered with. Because the object it was registered with has taken
* ownership, it becomes responsible for managing that setting object's memory.
* \warning Do \b not delete the setting after registering it.
* \param setting A pointer to the setting that will be registered.
* \return True if successful. False if registry failed.
*/
virtual bool registerSetting(Setting *setting);
/*!
* \brief Unregisters the given setting from this SettingsObject and disconnects its signals.
* \note This does not delete the setting. Furthermore, when the setting is
* unregistered, the SettingsObject drops ownership of the setting. This means
* that if you unregister a setting, its parent is set to null and you become
* responsible for freeing its memory.
* \param setting The setting to unregister.
*/
virtual void unregisterSetting(Setting *setting);
/*!
* \brief Gets the setting with the given ID.
* \param id The ID of the setting to get.
* \return A pointer to the setting with the given ID.
* Returns null if there is no setting with the given ID.
* \sa operator []()
*/
virtual Setting *getSetting(const QString &id) const;
/*!
* \brief Same as getSetting()
* \param id The ID of the setting to get.
* \return A pointer to the setting with the given ID.
* \sa getSetting()
*/
inline Setting *operator [](const QString &id) { return getSetting(id); }
/*!
* \brief Gets the value of the setting with the given ID.
* \param id The ID of the setting to get.
* \return The setting's value as a QVariant.
* If no setting with the given ID exists, returns an invalid QVariant.
*/
virtual QVariant get(const QString &id) const;
/*!
* \brief Sets the value of the setting with the given ID.
* If no setting with the given ID exists, returns false and logs to qDebug
* \param id The ID of the setting to change.
* \param value The new value of the setting.
* \return True if successful, false if it failed.
*/
virtual bool set(const QString &id, QVariant value);
/*!
* \brief Reverts the setting with the given ID to default.
* \param id The ID of the setting to reset.
*/
virtual void reset(const QString &id) const;
/*!
* \brief Gets a QList with pointers to all of the registered settings.
* The order of the entries in the list is undefined.
* \return A QList with pointers to all registered settings.
*/
virtual QList<Setting *> getSettings();
/*!
* \brief Checks if this SettingsObject contains a setting with the given ID.
* \param id The ID to check for.
* \return True if the SettingsObject has a setting with the given ID.
*/
virtual bool contains(const QString &id);
signals:
/*!
* \brief Signal emitted when one of this SettingsObject object's settings changes.
* This is usually just connected directly to each Setting object's
* settingChanged() signals.
* \param setting A reference to the Setting object that changed.
* \param value The Setting object's new value.
*/
void settingChanged(const Setting &setting, QVariant value);
/*!
* \brief Signal emitted when one of this SettingsObject object's settings resets.
* This is usually just connected directly to each Setting object's
* settingReset() signals.
* \param setting A reference to the Setting object that changed.
*/
void settingReset(const Setting &setting);
protected slots:
/*!
* \brief Changes a setting.
* This slot is usually connected to each Setting object's
* settingChanged() signal. The signal is emitted, causing this slot
* to update the setting's value in the config file.
* \param setting A reference to the Setting object that changed.
* \param value The setting's new value.
*/
virtual void changeSetting(const Setting &setting, QVariant value) = 0;
/*!
* \brief Resets a setting.
* This slot is usually connected to each Setting object's
* settingReset() signal. The signal is emitted, causing this slot
* to update the setting's value in the config file.
* \param setting A reference to the Setting object that changed.
*/
virtual void resetSetting(const Setting &setting) = 0;
protected:
/*!
* \brief Connects the necessary signals to the given Setting.
* \param setting The setting to connect.
*/
virtual void connectSignals(const Setting &setting);
/*!
* \brief Disconnects signals from the given Setting.
* \param setting The setting to disconnect.
*/
virtual void disconnectSignals(const Setting &setting);
/*!
* \brief Function used by Setting objects to get their values from the SettingsObject.
* \param setting The
* \return
*/
virtual QVariant retrieveValue(const Setting &setting) = 0;
friend class Setting;
private:
QMap<QString, Setting *> m_settings;
};
/*!
* \brief A global settings object.
*/
LIBSETTINGS_EXPORT extern SettingsObject *globalSettings;
#endif // SETTINGSOBJECT_H
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