author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Mon, 04 Oct 2010 00:38:12 +0300 | |
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/**************************************************************************** |
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** |
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** Copyright (C) 2008-2010 Nokia Corporation and/or its subsidiary(-ies). |
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** All rights reserved. |
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** Contact: Nokia Corporation (developer.feedback@nokia.com) |
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** |
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** This file is part of the HbCore module of the UI Extensions for Mobile. |
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** |
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** GNU Lesser General Public License Usage |
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** This file may be used under the terms of the GNU Lesser General Public |
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** License version 2.1 as published by the Free Software Foundation and |
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** appearing in the file LICENSE.LGPL included in the packaging of this file. |
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** Please review the following information to ensure the GNU Lesser General |
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** Public License version 2.1 requirements will be met: |
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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** |
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** In addition, as a special exception, Nokia gives you certain additional |
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** rights. These rights are described in the Nokia Qt LGPL Exception |
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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** |
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** If you have questions regarding the use of this file, please contact |
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** Nokia at developer.feedback@nokia.com. |
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** |
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****************************************************************************/ |
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#include <hbindicatorplugininterface.h> |
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/*! |
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\class HbIndicatorPluginInterface |
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\brief HbIndicatorPluginInterface is an abstract interface class for indicator plugins. |
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Indicators are activated, deactivated and updated using HbIndicator class. Indicator |
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framework takes care of displaying indicators in satus bar and/or indicator menu. |
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Indicator plugins contain implentation of indicators. Single pluging can implement |
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one or several indicators. HbIndicatorInterface defines functionality required from an |
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indicator implementation. |
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Indicators are identified by a string. By convention the string should follow |
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inverted domain name format. For example com.nokia.hb.indicator.xxx/1.0. |
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Function indicatorTypes() returns a list of indicators the plugin implements. |
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Appending version number into indicator type string enables versioning. |
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A plugin should handle versioning by returning indicator type string for all versions it |
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implements in indicatorTypes() and then in createIndicator() create an indicator |
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instance compatible with the version requested. This could always be the latest version if it |
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is backwards compatible with older versions. Indicator framework is unaware of version |
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numbers in type strings. It performs string comparison of the whole string when searching |
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for a plugin. |
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Plugins are responsible for maintaining system security for their own part. If plugin |
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performs operations that may compromise security or want's to limit access to specific |
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clients, it should check client security credentials in accessAllowed() function. |
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Indicator framework calls this function before activating/deactivating indicators. |
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\section _exceptions Exception handling |
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Indicator service uses two strategies in exception handling: Avoidance and trapping. |
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Memory allocation exceptions while an indicator is running are avoided by ensuring there is |
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sufficient heap space available before allowing new indicators to be activated. |
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Trapping is used while an indicator is created. A call to createIndicator() is enclosed |
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in try/catch block. Memory allocation exception causes indicator activation to fail |
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and an error is returned to a client. Plugin should take care there are no memory leaks |
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if exception is thrown inside createIndicator(). Calls to HbIndicatorInterface |
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functions are trapped and thrown allocation exceptions are ignored. Plugins can |
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provide more fine grained exception handling by trapping exceptions themselves. |
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\section _platform_hbindicatorplugin Platform-specific implementation notes for HbIndicatorPluginInterface |
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\subsection _nonsymbian Non-Symbian |
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Indicator plugins are loaded into client process. Plugin executables are searched from |
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application's current directory and HB_PLUGINS_DIR/indicators directory. |
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\subsection _symbian Symbian |
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Plugins are run by a server with platform security capabilities ProtServ, SwEvent, |
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TrustedUI and ReadDeviceData. If a plugin doesn't have required platform security |
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capabilities it will not load. |
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Device dialog plugin stubs (.qtplugin) are searched from /resource/plugins/indicators directory |
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and executables in /sys/bin directory in each drive. |
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\section _example_code Example code |
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Below is an example of how to create a simple indicator plugin. |
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If plugin implements only one indicator, plugin can also inherit from |
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HbIndicatorInterface. Example header-file: |
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\snippet{tsrc\unit\unittest_hbindicator\codesnippetplugin\hbcodesnippetplugin.h,1} |
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Example source-file: |
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\snippet{tsrc\unit\unittest_hbindicator\codesnippetplugin\hbcodesnippetplugin.cpp,1} |
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If more than one indicators are implemented inside a plugin, plugin inherits from HbIndicatorPluginInterface. |
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\snippet{tsrc\unit\unittest_hbindicator\codesnippetplugin\hbcodesnippetplugin.h,2} |
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And createIndicator should create new object based on indicator type. |
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\snippet{tsrc\unit\unittest_hbindicator\codesnippetplugin\hbcodesnippetplugin.cpp,2} |
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\sa HbIndicator, HbIndicatorInterface |
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\stable |
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\hbcore |
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*/ |
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/*! |
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\fn virtual QStringList HbIndicatorPluginInterface::indicatorTypes() const = 0 |
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Should return the indicator types the plugin implements. |
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*/ |
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/*! |
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\fn virtual bool HbIndicatorPluginInterface::accessAllowed( |
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const QString &indicatorType, const QVariantMap &securityInfo) const |
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Checks if client is allowed to activate or deactivate the indicator. The |
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implementation is operating system dependent. On Symbian this may involve checking client's |
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platform security capabilities or secure ID for example. |
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\a indicatorType contains indicator type. |
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\a securityInfo contains information for security check. See HbDeviceDialogPlugin::accessAllowed() for format. |
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Should return true if client is allowed to activate and deactivate the indicator. |
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\sa HbDeviceDialogPlugin::accessAllowed() |
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*/ |
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/*! |
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\fn virtual HbIndicatorInterface *HbIndicatorPluginInterface::createIndicator(const QString &indicatorType) = 0 |
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Creates an indicator of type \a indicatorType. Ownership is passed to the caller. |
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\sa HbIndicatorPluginInterface::indicatorTypes() |
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*/ |
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/*! |
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\fn virtual int HbIndicatorPluginInterface::error() const = 0 |
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Returns the last error code. The code is cleared when any other API function than error() is |
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called. |
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*/ |
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