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.

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

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]>

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]>

IN PROGRESS 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]>

IN PROGRESS 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 Out of process DataEngines Out of process DataEngines <[email protected]>

TODO 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. <[email protected]>

TODO 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. <[email protected]>

TODO 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]>

TODO 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]>

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

TODO 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]>

TODO 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
IN PROGRESS 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]>

IN PROGRESS 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]>

IN PROGRESS 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]>

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

This page was last edited on 29 January 2014, at 23:36. Content is available under Creative Commons License SA 4.0 unless otherwise noted.