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Could anyone give me, a clear explanation (or links) on the notion of Semantics (what is it actually, when to use, update...) in the context of Flutter?
I googled a lot but have not found any good explanation so far.
Many thanks in advance,
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A node that represents some semantic data. The semantics tree is maintained during the semantics phase of the pipeline (i.e., during PipelineOwner. flushSemantics), which happens after compositing. The semantics tree is then uploaded into the engine for use by assistive technology. AbstractNode.
In Semantics, we have (among others) three useful String parameters for that: label, which is a brief description of the widget, hint, which is an explanation of the action that will occur when the widget is interacted with, and value, which provides a textual description of the widget's state.
bool semanticContainer. Whether this widget represents a single semantic container, or if false a collection of individual semantic nodes. Defaults to true. Setting this flag to true will attempt to merge all child semantics into this node. Setting this flag to false will force all child semantic nodes to be explicit.
There are broadly two types of widgets in the flutter: Stateless Widget. Stateful Widget.
Didier I want to thank you for detailed study & post on your blog, you almost answered your own question, so I wanted to post it here for completeness, in case anyone else is seeking answers on Semantics - it's a great introduction:
https://www.didierboelens.com/2018/07/semantics/
"If you want to debug the Semantics of your application, you may set the showSemanticsDebugger property of your MaterialApp to true. This will force Flutter to generate an overlay to visualize the Semantics tree."
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