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[feature] QgsSettings QGIS QSettings replacement (#4160)
* [feature] QgsSettings QGIS QSettings replacement This is the new QgsSettings class that adds an (optional) Global Settings additional ini file where a system administrator can store default values for the settings and provide pre-configuration. If an ini file named qgis_global_settings.ini is found in the pkgDataPath directory it is automatically loaded, this path can be overriden by a command line argument ( --globalsettingsfile path ) and through an environment variable (QGIS_GLOBAL_SETTINGS_FILE).
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| /*************************************************************************** | ||
| qgssettings.sip | ||
| -------------------------------------- | ||
| Date : January 2017 | ||
| Copyright : (C) 2017 by Alessandro Pasotti | ||
| Email : apasotti at boundlessgeo dot com | ||
| *************************************************************************** | ||
| * * | ||
| * This program is free software; you can redistribute it and/or modify * | ||
| * it under the terms of the GNU General Public License as published by * | ||
| * the Free Software Foundation; either version 2 of the License, or * | ||
| * (at your option) any later version. * | ||
| * * | ||
| ***************************************************************************/ | ||
|
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| /** \ingroup core | ||
| * \class QgsSettings | ||
| * | ||
| * This class is a composition of two QSettings instances: | ||
| * - the main QSettings instance is the standard User Settings and | ||
| * - the second one (Global Settings) is meant to provide read-only | ||
| * pre-configuration and defaults to the first one. | ||
| * | ||
| * Unlike the original QSettings, the keys of QgsSettings are case insensitive. | ||
| * | ||
| * For a given settings key, the function call to value(key, default) will return | ||
| * the first existing setting in the order specified below: | ||
| * - User Settings | ||
| * - Global Settings | ||
| * - Default Value | ||
| * | ||
| * The path to the Global Settings storage can be set before constructing the QgsSettings | ||
| * objects, with a static call to: | ||
| * static bool setGlobalSettingsPath( QString path ); | ||
| * | ||
| * QgsSettings provides some shortcuts to get/set namespaced settings from/to a specific section: | ||
| * - Core | ||
| * - Gui | ||
| * - Server | ||
| * - Plugins | ||
| * - Misc | ||
| * | ||
| * @note added in QGIS 3 | ||
| */ | ||
| class QgsSettings : public QObject | ||
| { | ||
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| %TypeHeaderCode | ||
| #include <qgssettings.h> | ||
| %End | ||
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| public: | ||
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| //! Sections for namespaced settings | ||
| enum Section | ||
| { | ||
| NoSection, | ||
| Core, | ||
| Gui, | ||
| Server, | ||
| Plugins, | ||
| Misc | ||
| }; | ||
|
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| /** Construct a QgsSettings object for accessing settings of the application | ||
| * called application from the organization called organization, and with parent parent. | ||
| */ | ||
| explicit QgsSettings( const QString &organization, | ||
| const QString &application = QString(), QObject *parent = 0 ); | ||
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| /** Construct a QgsSettings object for accessing settings of the application called application | ||
| * from the organization called organization, and with parent parent. | ||
| * If scope is QSettings::UserScope, the QSettings object searches user-specific settings first, | ||
| * before it searches system-wide settings as a fallback. If scope is QSettings::SystemScope, | ||
| * the QSettings object ignores user-specific settings and provides access to system-wide settings. | ||
| * | ||
| * The storage format is set to QSettings::NativeFormat (i.e. calling setDefaultFormat() before | ||
| * calling this constructor has no effect). | ||
| * | ||
| * If no application name is given, the QSettings object will only access the organization-wide | ||
| * locations. | ||
| */ | ||
| QgsSettings( QSettings::Scope scope, const QString &organization, | ||
| const QString &application = QString(), QObject *parent = 0 ); | ||
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| /** Construct a QgsSettings object for accessing settings of the application called application | ||
| * from the organization called organization, and with parent parent. | ||
| * If scope is QSettings::UserScope, the QSettings object searches user-specific settings first, | ||
| * before it searches system-wide settings as a fallback. If scope is QSettings::SystemScope, | ||
| * the QSettings object ignores user-specific settings and provides access to system-wide settings. | ||
| * If format is QSettings::NativeFormat, the native API is used for storing settings. If format | ||
| * is QSettings::IniFormat, the INI format is used. | ||
| * | ||
| * If no application name is given, the QSettings object will only access the organization-wide | ||
| * locations. | ||
| */ | ||
| QgsSettings( QSettings::Format format, QSettings::Scope scope, const QString &organization, | ||
| const QString &application = QString(), QObject *parent = 0 ); | ||
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| /** Construct a QgsSettings object for accessing the settings stored in the file called fileName, | ||
| * with parent parent. If the file doesn't already exist, it is created. | ||
| * | ||
| * If format is QSettings::NativeFormat, the meaning of fileName depends on the platform. On Unix, | ||
| * fileName is the name of an INI file. On macOS and iOS, fileName is the name of a .plist file. | ||
| * On Windows, fileName is a path in the system registry. | ||
| * | ||
| * If format is QSettings::IniFormat, fileName is the name of an INI file. | ||
| * | ||
| * Warning: This function is provided for convenience. It works well for accessing INI or .plist | ||
| * files generated by Qt, but might fail on some syntaxes found in such files originated by | ||
| * other programs. In particular, be aware of the following limitations: | ||
| * - QgsSettings provides no way of reading INI "path" entries, i.e., entries with unescaped slash characters. | ||
| * (This is because these entries are ambiguous and cannot be resolved automatically.) | ||
| * - In INI files, QSettings uses the @ character as a metacharacter in some contexts, to encode | ||
| * Qt-specific data types (e.g., \@Rect), and might therefore misinterpret it when it occurs | ||
| * in pure INI files. | ||
| */ | ||
| QgsSettings( const QString &fileName, QSettings::Format format, QObject *parent = 0 ); | ||
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| /** Constructs a QgsSettings object for accessing settings of the application and organization | ||
| * set previously with a call to QCoreApplication::setOrganizationName(), | ||
| * QCoreApplication::setOrganizationDomain(), and QCoreApplication::setApplicationName(). | ||
| * | ||
| * The scope is QSettings::UserScope and the format is defaultFormat() (QSettings::NativeFormat | ||
| * by default). Use setDefaultFormat() before calling this constructor to change the default | ||
| * format used by this constructor. | ||
| */ | ||
| explicit QgsSettings( QObject *parent = 0 ); | ||
| ~QgsSettings(); | ||
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| /** Appends prefix to the current group. | ||
| * The current group is automatically prepended to all keys specified to QSettings. | ||
| * In addition, query functions such as childGroups(), childKeys(), and allKeys() | ||
| * are based on the group. By default, no group is set. | ||
| */ | ||
| void beginGroup( const QString &prefix ); | ||
| //! Resets the group to what it was before the corresponding beginGroup() call. | ||
| void endGroup(); | ||
| //! Returns a list of all keys, including subkeys, that can be read using the QSettings object. | ||
| QStringList allKeys() const; | ||
| //! Returns a list of all top-level keys that can be read using the QSettings object. | ||
| QStringList childKeys() const; | ||
| //! Returns a list of all key top-level groups that contain keys that can be read using the QSettings object. | ||
| QStringList childGroups() const; | ||
| //! Return the path to the Global Settings QSettings storage file | ||
| static QString globalSettingsPath(); | ||
| //! Set the Global Settings QSettings storage file | ||
| static bool setGlobalSettingsPath( QString path ); | ||
| //! Adds prefix to the current group and starts reading from an array. Returns the size of the array. | ||
| int beginReadArray( const QString &prefix ); | ||
| //! Closes the array that was started using beginReadArray() or beginWriteArray(). | ||
| void endArray(); | ||
| //! Sets the current array index to i. Calls to functions such as setValue(), value(), remove(), and contains() will operate on the array entry at that index. | ||
| void setArrayIndex( int i ); | ||
| //! Sets the value of setting key to value. If the key already exists, the previous value is overwritten. | ||
| //! An optional Section argument can be used to set a value to a specific Section. | ||
| //! @note keys are case insensitive | ||
| void setValue(const QString &key, const QVariant &value, const QgsSettings::Section section = QgsSettings::Section::NoSection ); | ||
| /** Returns the value for setting key. If the setting doesn't exist, it will be | ||
| * searched in the Global Settings and if not found, returns defaultValue. | ||
| * If no default value is specified, a default QVariant is returned. | ||
| * An optional Section argument can be used to get a value from a specific Section. | ||
| */ | ||
| QVariant value( const QString &key, const QVariant &defaultValue = QVariant(), | ||
| const QgsSettings::Section section = QgsSettings::Section::NoSection ) const; | ||
| //! Removes the setting key and any sub-settings of key. | ||
| void remove(const QString &key); | ||
| //! Return the sanitized and prefixed key | ||
| QString prefixedKey( const QString &key, const Section section ) const; | ||
| //! Returns the path where settings written using this QSettings object are stored. | ||
| QString fileName() const; | ||
| //! Writes any unsaved changes to permanent storage, and reloads any settings that have been | ||
| //! changed in the meantime by another application. | ||
| //! This function is called automatically from QSettings's destructor and by the event | ||
| //! loop at regular intervals, so you normally don't need to call it yourself. | ||
| void sync(); | ||
| //! Returns true if there exists a setting called key; returns false otherwise. | ||
| //! If a group is set using beginGroup(), key is taken to be relative to that group. | ||
| bool contains(const QString &key) const; | ||
|
|
||
| }; |
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