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+# Qt Layouts
+
+Writing a user interface, that automatically adjusts to different sizes, language,
+font or theme changes is a challenge, that can be solved best with a layout system.
+Such an implementation exists from the beginning for the [Qt framework]( https://www.qt.io )
+and is still relevant for the desktop solution [Qt/Widgets]( https://doc.qt.io/qt-5/qtwidgets-index.html ).
+It's ideas have been transferred to the [Qt/Graphics]( https://doc.qt.io/qt-5/qgraphicslayout.html )
+module and in a restricted version to the newest technology [Qt/Quick](https://doc.qt.io/qt-5/qtquick-index.html).
+Yet another variation can be found in the [QSkinny]( https://github.com/uwerat/qskinny ) library.
+
+This article explains the Qt layout concept and compares the different implementations.
+
+## Definitions
+
+A layout calculates position and size ( = geometry ) for one or several
+elements. Its algorithm relies on parameters, that are provided
+from each element. Furthermore it also provides these parameters, so that it can
+be used as an element in another layout.
+
+A positioner finds the position without changing sizes.
+Therefore every layout is a positioner, but a positioner is no layout.
+To avoid confusion the term "positioner" will be used for the rest of this document
+exclusivly for non layouts.
+
+- minimum
+- preferred
+- maximum
+- constraints
+- policy
+- explicit/implicit
+- horizontal/vertical
+- stretch
+- more than one element per cell
+
++---------------+---------------+--------------------+
+| Fruit         | Price         | Advantages         |
++===============+===============+====================+
+| Bananas       | $1.34         | - built-in wrapper |
+|               |               | - bright color     |
++---------------+---------------+--------------------+
+| Oranges       | $2.10         | - cures scurvy     |
+|               |               | - tasty            |
++---------------+---------------+--------------------+
+
+~~~
+{
+  "firstName": "John",
+  "lastName": "Smith",
+  "age": 25
+}
+~~~