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| Refactoring goals towards a Marble 2.0 version.
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| == Marble Library Split ==
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| Split libmarblewidget into several libraries:
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| * libMarbleCore (or libMarbleMap?)
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| ** Non-interactive classes, e.g. geodata, file parsing
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| ** Interactive, UI toolkit independent classes, e.g. layers, graphicsview
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| ** No dependency to QWidgets or Qt Quick
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| * libMarbleWidgets
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| ** QWidget related interactive classes
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| ** Dependency to QWidget, libMarbleCore
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| * libMarbleQuick
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| ** Qt Quick 2.0 related interactive classes
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| ** Dependency to QtQuick, libMarbleCore
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| * Further possible ones (see also plugins below): MarbleRouting, MarbleTours, MarbleMapEditor
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| == Header Normalization ==
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| * During compilation, the subdirectories of marble/ are not added to the compiler search path anymore, so #include statements need to use the full path marble/$module/$class.h for files outside their directory.
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| * Headers follow the directory structure marble/$module/$path, where $path is either a filename or a directory + filename, but not deeper nested
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| == Build System Improvements ==
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| * The header structure in src/lib/ should match the exported headers in include/. No "flattening" as it happens currently where e.g. marble/geodata/* is copied to /marble/.
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| * <s>KDE as a dependency is only used in src/apps/marble-kde and KDE related things like plasmoids. No KDE usage in the library. As a side effect, QTONLY will go away (replaced by a less restrictive WITH_KDE)</s> Implemented since Applications/15.08
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| * Provide a sane FindMarble.cmake, possibly using COMPONENTS similar to Qt, Boost (each library would be a component)
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| == Qt Version Dependency Bump ==
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| * Require at least Qt 5.0 to avoid a maintenance nightmare
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| * <s>Require KDE Frameworks 5 (optional, but kdelibs 4.x not supported)</s> Implemented since Applications/15.08
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| * Require Qt Quick 2.0 (optional, but Qt Quick 1.1 not supported)
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| * <s>Provide a long term support stable branch with Qt 4.x / KDE 4.x / Qt Quick 1.1 support</s> Please use Applications/15.04 for that
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| == Plugin Sanitization ==
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| * Clearly split between the loading mechanism and the interface (API) such that extensions can be realized both inside a library and via plugins without hassles (emphasis on without hassles)
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| * Deleting plugins should be possible and remove the feature provided by it, but it should not be advertized as a feature
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| * No mandatory plugins (e.g. KML parsing). Mandatory "plugins" must be part of a library
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| * Decide on criteria what to realize as plugins and what as modules (libraries). E.g. only do plugins where a common API is easily identified and at least three plugins of that type are provided by Marble itself
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