Plasma/libplasma2: Difference between revisions

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This page is dedicated to planning of the libplasma2.
This page is dedicated to planning of the libplasma2.


libplasma2 will be binary and source incompatible with the current libplasma. This means that we can fix some issues that are currently present in plasma's design.
libplasma2 will be binary and source incompatible with the current libplasma. This means that we can fix some issues that are currently present in plasma's design. Any changes that affect the source compatibility must be documented [[Plasma/PortingTolibplasma2|here]]


Enter the issues you wish fixed in the following form:
Enter the issues you wish fixed in the following form:
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| http://mail.kde.org/pipermail/plasma-devel/2010-October
| http://mail.kde.org/pipermail/plasma-devel/2010-October
|-
|-
|}
= General TODOs =
{| class="sortable" border="1" cellpadding="4" cellspacing="0" style="border: gray solid 1px; border-collapse: collapse; text-align: left; width: 100%;"
|- style="background: #ececec; white-space:nowrap;"
! Status !! Name !! Summary !! Developer
{{FeatureProjectDone
| Fix plasmoidpackagetest
| plasmoidpackagetest currently does not build due to missing KIO, etc. API. Port away from KIO and friends to Qt equivalents and get it pass again.
}}
{{FeatureProjectTodo
| Signing
| Integrate Signing classes with Package; put Signing class in a thread, potentially make it private API. Current is in staging directory.
}}
|}
|}


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}}
}}


{{FeatureProjectTodo
{{FeatureProjectDone
| [[Plasma/libplasma2/dataengineimplicitlyshared |Make DataEngine implicitly shared]]
| We pass DataEngines around as pointers, which makes them vulnerable to all the usual pointer-related issues: crashes, accidental deletions, etc.
}}
 
{{FeatureProjectTodo
| [[Plasma/libplasma2/dataengineconsumerapi |DataEngineConsumer public API]]  
| [[Plasma/libplasma2/dataengineconsumerapi |DataEngineConsumer public API]]  
| Right now it is a bit too easy to make mistakes with using DataEngines outside of the normal consumers (Applet, Wallpaper, etc.). This is because DataEngineManager exposes the reference counting details as public API.  
| Right now it is a bit too easy to make mistakes with using DataEngines outside of the normal consumers (Applet, Wallpaper, etc.). This is because DataEngineManager exposes the reference counting details as public API.  
|foo@kde.org|Jhon Doe
|aseigo@kde.org|aseigo
}}
}}


{{FeatureProjectTodo
{{FeatureProjectDone
| [[Plasma/libplasma2/refactorpackageclasses |Refactor Package* Classes]]  
| [[Plasma/libplasma2/refactorpackageclasses |Refactor Package* Classes]]  
| PackageMetaData is a relatively thin and inefficient wrapper around KDesktopFile. It's used rarely and doesn't serve a clear purpose. PackageStructure is a relatively static class that combines both a method for getting new packages as well as a description of the underlying package.  
| PackageMetaData is a relatively thin and inefficient wrapper around KDesktopFile. It's used rarely and doesn't serve a clear purpose. PackageStructure is a relatively static class that combines both a method for getting new packages as well as a description of the underlying package.  
|foo@kde.org|Jhon Doe
|aseigo@kde.org|aseigo
}}
}}


{{FeatureProjectTodo
{{FeatureProjectDone
| [[Plasma/libplasma2/asyncstructureinstallpackage |PackageStructure::installPackage should be async]]  
| [[Plasma/libplasma2/asyncstructureinstallpackage |PackageStructure::installPackage should be async]]  
| Package::installPackage is current synchronous, which prevents running it in another thread, doing user interaction (e.g. to confirm other dependencies to download) or taking additional actions such as downloads.  
| Package::installPackage is current synchronous, which prevents running it in another thread, doing user interaction (e.g. to confirm other dependencies to download) or taking additional actions such as downloads.  
|foo@kde.org|Jhon Doe
|sebas@kde.org|Sebastian Kügler
}}
}}


{{FeatureProjectTodo  
{{FeatureProjectTodo  
| [[Plasma/libplasma2/outofprocessdataengines |Out of process DataEngines]]  
| [[Plasma/libplasma2/dataengineimplicitlyshared |Make DataEngine implicitly shared]]  
| Out of process DataEngines  
| We pass DataEngines around as pointers, which makes them vulnerable to all the usual pointer-related issues: crashes, accidental deletions, etc.
}}
}}


{{FeatureProjectTodo  
{{FeatureProjectTodo  
| [[Plasma/libplasma2/improvingremotewidgets |Improving remote widgets]]  
| [[Plasma/libplasma2/outofprocessdataengines |Out of process DataEngines]]  
| Remote widgets work if the widget uses DataEngines and Services exclusively, polls the remote DataEngine excessively and only speaks one network backend.
| Out of process DataEngines  
}}
}}


{{FeatureProjectTodo
{{FeatureProjectDone
| [[Plasma/libplasma2/improvingremotewidgets |Improving remote widgets]]
| Remote widgets work if the widget uses DataEngines and Services exclusively, polls the remote DataEngine excessively and only speaks one network backend.
}}
 
{{FeatureProjectTodo
| [[Plasma/libplasma2/modellikedataengines |More model-like dataengines]]  
| [[Plasma/libplasma2/modellikedataengines |More model-like dataengines]]  
| Many dataengines return data as series of items: like rss, microblog and tasks, and they do in different ways, rss has a list of Data in a single key, microblog has an item per key, tasks has an item per source.
| Many dataengines return data as series of items: like rss, microblog and tasks, and they do in different ways, rss has a list of Data in a single key, microblog has an item per key, tasks has an item per source.
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}}
}}


{{FeatureProjectTodo
{{FeatureProjectDone
| [[Plasma/libplasma2/appletdestroyed | Applet::appletDestroyed signal poorly named]]  
| [[Plasma/libplasma2/appletdestroyed | Applet::appletDestroyed signal poorly named]]  
| appletDestroyed is emitted in ~Applet, but this can happen even if it isn't "destroyed" but just deleted. Despite its name, appletDestroyed has nothing to do with Applet::destroy() and Applet::destroyed()
| appletDestroyed is emitted in ~Applet, but this can happen even if it isn't "destroyed" but just deleted. Despite its name, appletDestroyed has nothing to do with Applet::destroy() and Applet::destroyed()
|foo@kde.org|Jhon Doe
|kok3rs@kde.org|Antonis Tsiapaliokas
}}
}}


{{FeatureProjectTodo
{{FeatureProjectDone
| [[Plasma/libplasma2/svgsetimagepath | Svg::setImagePath is not virtual]]  
| [[Plasma/libplasma2/svgsetimagepath | Svg::setImagePath is not virtual]]  
| FrameSvg (and potentially other subclasses of Svg) need to take action when the image path is changed. setImagePath is not virtual nor does it call any internal virtuals. This has resulted in a necessary but unfortunate hack in Svg::setImagePath specifically for FrameSvg.
| FrameSvg (and potentially other subclasses of Svg) need to take action when the image path is changed. setImagePath is not virtual nor does it call any internal virtuals. This has resulted in a necessary but unfortunate hack in Svg::setImagePath specifically for FrameSvg.
|foo@kde.org|Jhon Doe
|aseigo@kde.org|Aaron Seigo
}}
}}


{{FeatureProjectTodo
{{FeatureProjectDone
| [[Plasma/libplasma2/mergeextendersetgroupmethods | Merge ExtenderItem::setGroup methods]]  
| [[Plasma/libplasma2/mergeextendersetgroupmethods | Merge ExtenderItem::setGroup methods]]  
| There are multiple setGroup methods in ExtenderItem, which could be merged into one method with suitable default parameters.
| There are multiple setGroup methods in ExtenderItem, which could be merged into one method with suitable default parameters.
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}}
}}


{{FeatureProjectTodo
{{FeatureProjectDone
| [[Plasma/libplasma2/dialognotconstgraphicswidget | Dialog::graphicsWidget() is not const]]  
| [[Plasma/libplasma2/dialognotconstgraphicswidget | Dialog::graphicsWidget() is not const]]  
| As a simple getter, graphicsWidget() should be const.
| As a simple getter, graphicsWidget() should be const.
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}}
}}


{{FeatureProjectTodo
{{FeatureProjectDone
| [[Plasma/libplasma2/wallpaperprotecteddatamember |Wallpaper has a protected data member]]  
| [[Plasma/libplasma2/wallpaperprotecteddatamember |Wallpaper has a protected data member]]  
| QList<QAction*> contextActions is not in the dptr.
| QList<QAction*> contextActions is not in the dptr.
|foo@kde.org|Jhon Doe
|aseigo@kde.org|Aaron Seigo
}}
}}


{{FeatureProjectTodo
{{FeatureProjectDone
| [[Plasma/libplasma2/abstracttoolusevirtuals |Use virtuals instead of slots in AbstractToolBox]]  
| [[Plasma/libplasma2/abstracttoolusevirtuals |Use virtuals instead of slots in AbstractToolBox]]  
| There are three slots in AbstractToolBox that really ought to be virtuals: restore, save and reposition. They are currently QMetaObject::invoke()'d instead.
| There are three slots in AbstractToolBox that really ought to be virtuals: restore, save and reposition. They are currently QMetaObject::invoke()'d instead.
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}}
}}


{{FeatureProjectTodo
{{FeatureProjectDone
| [[Plasma/libplasma2/duplicatedisbusy |isBusy Q_PROPERTY duplicate in Applet]]  
| [[Plasma/libplasma2/duplicatedisbusy |isBusy Q_PROPERTY duplicate in Applet]]  
| There are two "busy" Q_PROPERTY entries defined in Applet: isBusy and busy. The latter is the correct frm.
| There are two "busy" Q_PROPERTY entries defined in Applet: isBusy and busy. The latter is the correct frm.
Line 174: Line 182:
}}
}}


{{FeatureProjectTodo
{{FeatureProjectDone
| [[Plasma/libplasma2/fullyqualifiedtype |Applet::messageButtonPressed should pass the fully qualified type]]  
| [[Plasma/libplasma2/fullyqualifiedtype |Applet::messageButtonPressed should pass the fully qualified type]]  
|  Applet has a signal void messageButtonPressed(const MessageButton button). Since moc does a string comparison in connect, trying to connect it to a slot that takes "Plasma::MessageButton" will not work because "MessageButton"  nq "Plasma::MessageButton"
|  Applet has a signal void messageButtonPressed(const MessageButton button). Since moc does a string comparison in connect, trying to connect it to a slot that takes "Plasma::MessageButton" will not work because "MessageButton"  nq "Plasma::MessageButton"
|foo@kde.org|Jhon Doe
|aseigo@kde.org|Aaron Seigo
}}
}}


{{FeatureProjectTodo
{{FeatureProjectDone
| [[Plasma/libplasma2/abstractrunnermimedata |AbstractRunner::mimeDataForMatch]]  
| [[Plasma/libplasma2/abstractrunnermimedata |AbstractRunner::mimeDataForMatch]]  
|  mimeDataForMatch is a slot due to BC.
|  mimeDataForMatch is a slot due to BC.
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}}
}}


{{FeatureProjectTodo
{{FeatureProjectDone
| [[Plasma/libplasma2/setwallpaperpath |Add const setWallpaperPath]]  
| [[Plasma/libplasma2/setwallpaperpath |Add const setWallpaperPath]]  
|  Add a function to Plasma::Wallpaper as virtual setWallpaperPath(const KUrl &url)   
|  Add a function to Plasma::Wallpaper as virtual setWallpaperPath(const KUrl &url)   
|foo@kde.org|Jhon Doe
|terietor@gmail.com|Giorgos Tsiapaliokas
}}
}}


{{FeatureProjectTodo
{{FeatureProjectDone
| [[Plasma/libplasma2/privateun-install |un/installPackage should be private]]  
| [[Plasma/libplasma2/privateun-install |un/installPackage should be private]]  
|  Both methods are static members of the public API, though all install/uninstall calls should be done through PackageStructure
|  Both methods are static members of the public API, though all install/uninstall calls should be done through PackageStructure
|foo@kde.org|Jhon Doe
|sebas@kde.org|Sebastian Kügler
}}
}}


{{FeatureProjectTodo
{{FeatureProjectDone
| [[Plasma/libplasma2/removecontextinfo |Remove context info classes]]  
| [[Plasma/libplasma2/removecontextinfo |Remove context info classes]]  
|  The classes are unused, and are not working. All data they provide can be accessible via data engines
|  The classes are unused, and are not working. All data they provide can be accessible via data engines
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}}
}}


{{FeatureProjectTodo
| [[Plasma/libplasma2/removecontextinfo |Remove context info classes]]
|  The classes are unused, and are not working. All data they provide can be accessible via data engines
}}
|}
|}


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! Status !! Name !! Summary !! Developer
! Status !! Name !! Summary !! Developer


{{FeatureProjectTodo
{{FeatureProjectDone
| [[Plasma/libplasma2/migratetoqtcomponents | Migrate widgets to QtComponents, drop current libplasma widgets]]  
| [[Plasma/libplasma2/migratetoqtcomponents | Migrate widgets to QtComponents, drop current libplasma widgets]]  
| QML allows faster UI creation compared to old widgets, Scene-graph doesn't support QGraphicsWidget
| QML allows faster UI creation compared to old widgets, Scene-graph doesn't support QGraphicsWidget
|foo@kde.org|Jhon Doe
|mart@kde.org|Marco Martin
}}
}}


{{FeatureProjectTodo
{{FeatureProjectDone
| [[Plasma/libplasma2/coronscenebookeeper | Port Corona away from QGV]]  
| [[Plasma/libplasma2/coronscenebookeeper | Port Corona away from QGV]]  
|  Change Corona from a QGraphicsScene to being a (singleton) scene bookeeper, In Scene-graph there is an 1:1 association scene:view
|  Change Corona from a QGraphicsScene to being a (singleton) scene bookeeper, In Scene-graph there is an 1:1 association scene:view
|foo@kde.org|Jhon Doe
|mart@kde.org|Marco Martin
}}
}}


{{FeatureProjectTodo
{{FeatureProjectDone
| [[Plasma/libplasma2/appletsansgraphicsitem|Applet no more a GraphicsItem]]  
| [[Plasma/libplasma2/appletsansgraphicsitem|Applet no more a GraphicsItem]]  
| Right now Applet is a QGraphicsWidget that can optionally include a QML root element (with its declarative engine), mixing QGraphicsWidgets and QDeclarativeItems, nd maybe creatng unneded items.
| Right now Applet is a QGraphicsWidget that can optionally include a QML root element (with its declarative engine), mixing QGraphicsWidgets and QDeclarativeItems, nd maybe creatng unneded items.
|foo@kde.org|Jhon Doe
|mart@kde.org|Marco Martin
}}
 
{{FeatureProjectDone
| A shell that is based on scene graph
| Write a single shell based on scene graph.
|[email protected]|Marco Martin
}}
 
{{FeatureProjectDone
| Port QML scriptengine to qml2
| The QML scriptengine should create the QQuickItems corresponding to containments and applets, parsing the qml in their packages
|[email protected]|Marco Martin
}}
 
{{FeatureProjectDone
| Port QML scriptengine away from QScriptEngine
| QML2 doesn't have QScriptEngine. It must either use only the declarative engine (means everything is qobject) or use directly V8
|[email protected]|Marco Martin
}}
}}


{{FeatureProjectTodo
{{FeatureProjectDone
| [[Plasma/libplasma2/libplasmanographicsbakends|libplasma not depending on graphics backends]]  
| [[Plasma/libplasma2/libplasmanographicsbakends|libplasma not depending on graphics backends]]  
| The above issue suggests that libplasma could not depend anymore neither from QGraphicsView or SceneGraph.
| The above issue suggests that libplasma could not depend anymore neither from QGraphicsView or SceneGraph.

Latest revision as of 23:36, 29 January 2014

Summary

This page is dedicated to planning of the libplasma2.

libplasma2 will be binary and source incompatible with the current libplasma. This means that we can fix some issues that are currently present in plasma's design. Any changes that affect the source compatibility must be documented here

Enter the issues you wish fixed in the following form:

Idea: Change libplasma2
Summary: We have a chance to change stuff now
Proposed solution: We change things
Discussion: http://mail.kde.org/pipermail/plasma-devel/2010-October

General TODOs

Status Name Summary Developer
DONE Fix plasmoidpackagetest plasmoidpackagetest currently does not build due to missing KIO, etc. API. Port away from KIO and friends to Qt equivalents and get it pass again. <[email protected]>


TODO Signing Integrate Signing classes with Package; put Signing class in a thread, potentially make it private API. Current is in staging directory. <[email protected]>


Design Issues

Status Name Summary Developer
DONE ServiceJob is autostarted ServiceJob is connected to a zero timer in Service::startOperationCall. If exec() is called on the job and it doesn't finish immediately, then the event loop will be start and the timer will fire causing start() to be called a second time. <[email protected]>


TODO Fewer friend classes Look at all friend relationships and see how many can be removed now due to evolution of libplasma itself or clever new approaches to the old problem. Public API clarity and cleanliness must not be sacrificed, however. Internal ugliness is better than external ugliness. <[email protected]>


DONE DataEngineConsumer public API Right now it is a bit too easy to make mistakes with using DataEngines outside of the normal consumers (Applet, Wallpaper, etc.). This is because DataEngineManager exposes the reference counting details as public API. <[email protected]>


DONE Refactor Package* Classes PackageMetaData is a relatively thin and inefficient wrapper around KDesktopFile. It's used rarely and doesn't serve a clear purpose. PackageStructure is a relatively static class that combines both a method for getting new packages as well as a description of the underlying package. <[email protected]>


DONE PackageStructure::installPackage should be async Package::installPackage is current synchronous, which prevents running it in another thread, doing user interaction (e.g. to confirm other dependencies to download) or taking additional actions such as downloads. <[email protected]>


TODO Make DataEngine implicitly shared We pass DataEngines around as pointers, which makes them vulnerable to all the usual pointer-related issues: crashes, accidental deletions, etc. <[email protected]>


TODO Out of process DataEngines Out of process DataEngines <[email protected]>


DONE More model-like dataengines Many dataengines return data as series of items: like rss, microblog and tasks, and they do in different ways, rss has a list of Data in a single key, microblog has an item per key, tasks has an item per source. <[email protected]>


TODO Lazy dataengine evaluation The problem with the current DE implementation (QVariants) is that data is kept in memory even if the user didn't request it. (for example, some engine could keep a pixmap ready for a data item, although the applet only wants the title. <[email protected]>


API Issues

Status Name Summary Developer
DONE Remove unimplemented virtual methods In various places there are virtual methods which were re-implemented, but then later had the implementation removed, but for binary compatibility reasons the method itself has to remain. <[email protected]>


DONE [mM]imetype -> [mM]imeType Everywhere else in KDE/Qt API it is "MimeType" <[email protected]>


DONE Wallpaper drop handling We now have two ways to note that a URL has been added to a wallpaper via external means: urlDropped(KUrl) and setUrls(KUrl::List). <[email protected]>


DONE Applet::appletDestroyed signal poorly named appletDestroyed is emitted in ~Applet, but this can happen even if it isn't "destroyed" but just deleted. Despite its name, appletDestroyed has nothing to do with Applet::destroy() and Applet::destroyed() <[email protected]>


DONE Svg::setImagePath is not virtual FrameSvg (and potentially other subclasses of Svg) need to take action when the image path is changed. setImagePath is not virtual nor does it call any internal virtuals. This has resulted in a necessary but unfortunate hack in Svg::setImagePath specifically for FrameSvg. <[email protected]>


DONE Merge ExtenderItem::setGroup methods There are multiple setGroup methods in ExtenderItem, which could be merged into one method with suitable default parameters. <[email protected]>


DONE Merge Theme::findInCache methods There are multiple findInCache methods in Theme, which could be merged into one method with suitable default parameters. <[email protected]>


DONE Dialog::graphicsWidget() is not const As a simple getter, graphicsWidget() should be const. <[email protected]>


DONE Wallpaper has a protected data member QList<QAction*> contextActions is not in the dptr. <[email protected]>


DONE Use virtuals instead of slots in AbstractToolBox There are three slots in AbstractToolBox that really ought to be virtuals: restore, save and reposition. They are currently QMetaObject::invoke()'d instead. <[email protected]>


DONE isBusy Q_PROPERTY duplicate in Applet There are two "busy" Q_PROPERTY entries defined in Applet: isBusy and busy. The latter is the correct frm. <[email protected]>


DONE Applet::geometryChanged() superfluous now QGraphicsWidget has a geometryChanged() signal now, it is only kept in Applet to preserve binary compatibility. <[email protected]>


DONE Applet::messageButtonPressed should pass the fully qualified type Applet has a signal void messageButtonPressed(const MessageButton button). Since moc does a string comparison in connect, trying to connect it to a slot that takes "Plasma::MessageButton" will not work because "MessageButton" nq "Plasma::MessageButton" <[email protected]>


DONE AbstractRunner::mimeDataForMatch mimeDataForMatch is a slot due to BC. <[email protected]>


DONE Add const setWallpaperPath Add a function to Plasma::Wallpaper as virtual setWallpaperPath(const KUrl &url) <[email protected]>


DONE un/installPackage should be private Both methods are static members of the public API, though all install/uninstall calls should be done through PackageStructure <[email protected]>


DONE Remove context info classes The classes are unused, and are not working. All data they provide can be accessible via data engines <[email protected]>


QGraphicsView vs QML2

Status Name Summary Developer
DONE Migrate widgets to QtComponents, drop current libplasma widgets QML allows faster UI creation compared to old widgets, Scene-graph doesn't support QGraphicsWidget <[email protected]>


DONE Port Corona away from QGV Change Corona from a QGraphicsScene to being a (singleton) scene bookeeper, In Scene-graph there is an 1:1 association scene:view <[email protected]>


DONE Applet no more a GraphicsItem Right now Applet is a QGraphicsWidget that can optionally include a QML root element (with its declarative engine), mixing QGraphicsWidgets and QDeclarativeItems, nd maybe creatng unneded items. <[email protected]>


DONE A shell that is based on scene graph Write a single shell based on scene graph. <[email protected]>


DONE Port QML scriptengine to qml2 The QML scriptengine should create the QQuickItems corresponding to containments and applets, parsing the qml in their packages <[email protected]>


DONE Port QML scriptengine away from QScriptEngine QML2 doesn't have QScriptEngine. It must either use only the declarative engine (means everything is qobject) or use directly V8 <[email protected]>


DONE libplasma not depending on graphics backends The above issue suggests that libplasma could not depend anymore neither from QGraphicsView or SceneGraph. <[email protected]>