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85	85	The [[KIML page>>doc:Infrastructure for Meta Layout (KIML)]] has a high-level explanation of what happens when during the layout process. To take a look at it if you haven't already – it will make the following concepts easier to understand.
86	86	{{/tip}}
87	87
88		-(% style="line-height: 1.4285715;" %)After a layout manager has finished turning a given diagram into its KGraph representation, the layout options manager is asked to enrich the KGraph elements with layout options. The option values can come from different sources: the user might have set some using the layout view; there might be some defaults for certain kinds of diagrams; or the programmer might have decided to attach some layout options to certain elements for just this one layout run. Whatever the source, the options manager is in charge of collecting all these layout option values and making sure they find their way to the correct KGraph element. To start off with a clean plate, it first makes sure there are no layout options attached to the KGraph elements. It then does two things: collect every eligible source of layout options, and transfer layout options to the correct KGraph elements. Sounds easy enough.
	88	+(% style="line-height: 1.4285715;" %)After a layout manager has
89	89
90		-(% style="line-height: 1.4285715;" %)The question remains how the layout options sources work. Each source is represented by a class that implements the [[{{code language="none"}}ILayoutConfig{{/code}}>>url:https://git.rtsys.informatik.uni-kiel.de/projects/KIELER/repos/pragmatics/browse/plugins/de.cau.cs.kieler.kiml/src/de/cau/cs/kieler/kiml/config/ILayoutConfig.java||shape="rect"]] interface, called a //layout configuration//. KIML currently provides the following layout configurations, each representing a particular source of layout options:
91	91
92		-* {{code language="none"}}DefaultLayoutConfig{{/code}} – Sets fixed default values defined for layout options.
93		-* {{code language="none"}}EclipseLayoutConfig{{/code}} – Users can define default layout options to be set on elements that meet certain criteria via the KIML preference page. This layout configuration takes these options and applies them.
94		-* {{code language="none"}}SemanticLayoutConfig{{/code}} – ???
95		-* {{code language="none"}}GmfLayoutConfig{{/code}} / {{code language="none"}}GraphitiLayoutConfig{{/code}} – These configurations apply layout options set by the user in the layout view or stored in the notation model file of a diagram.
96		-* {{code language="none"}}VolatileLayoutConfig{{/code}} – A configuration whose only purpose it is to make sure certain layout options are set on certain diagram elements in a particular layout run.
	91	+{{warning title="ToDo"}}
	92	+Write this section.
	93	+{{/warning}}
97	97
98		-The options manager collects all available and applicable layout configurations and sorts them by priority (incidentally, the configurations were sorted by increasing priority just now). For every graph element, each configuration is asked to provide layout options, starting with the default layout configuration and working through the priority chain.
	95	+(% style="line-height: 1.4285715;" %)
99	99
100		-== A Few Details on Layout Configurations ==
101	101
102		-What we just learned is a bit of a simplification of what happens. The layout options manager not only asks each layout configuration to provide layout options for each graph element. Before we look at the details, let's take a look at the methods each layout configuration provides:
103		-
104		-{{code language="java"}}
105		-public interface ILayoutConfig {
106		- int getPriority();
107		-
108		- void enrich(LayoutContext context);
109		-
110		- Object getValue(LayoutOptionData<?> optionData, LayoutContext context);
111		-
112		- void transferValues(KLayoutData layoutData, LayoutContext context);
113		-}
114		-{{/code}}
115		-
116		-It is not hard to guess what {{code language="none"}}getPriority(){{/code}} does: it returns the priority a given layout configuration has. If two layout configurations set a layout option to different values on a given graph element, the value set by the configuration with lower priority gets overwritten. The other three methods look a bit more obscure, so we have to provide more details on what the options manager does, exactly.
117		-
118		-ENRICHING (+ WHAT IS A LAYOUT CONTEXT)
119		-
120		-TRANSFERRING
121		-
122		-GETVALUE (for the layout view?)
123		-
124		-== (% style="line-height: 1.4285715;" %)Implementing a Layout Configuration(%%) ==
125		-
126		-(% style="line-height: 1.4285715;" %)deciding what options are applicable depending on the context object; setting the options;
127		-
128		-
129	129	= (% style="line-height: 1.4285715;" %)Programmatically Setting Layout Options(%%) =
130	130
131	131	{{warning title="ToDo"}}

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1		-7700957
	1	+7700951

URL

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1		-https://rtsys.informatik.uni-kiel.de/confluence//wiki/spaces/KIELER/pages/7700957/Working With Layout Options
	1	+https://rtsys.informatik.uni-kiel.de/confluence//wiki/spaces/KIELER/pages/7700951/Working With Layout Options