use a (sophisticated) chain of responsibility to handle visualization
The VisualizationChain knows three different kinds of NodeVisualization:
- for visualization of the RootBox
- for visualization of the document structure
- for visualization of inline content
For each kind of visualization, there is a prioritized list of possible
NodeVisualizations, that are requested in order of highest priority to
visualize a given node. The first NodeVisualization which returns an
actual box wins.
This architecture allows to have:
- individual visualizations for each document type
- easy extension with custom NodeVisualization implementations
- simple and decoupled building blocks for visualization
Signed-off-by: Florian Thienel <florian@thienel.org>
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