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The channel of a claim: view properties, .change handlers, EMIT (format 0.6) - #18
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…at 0.6) A claim is now also the channel between the application and its view: - properties (.prop variables) the application sets and reads by name - libdmview_prop_set_int/_set_string/_get_int/_get_string -, read from the view file when it is claimed, so a name or a type the view does not have is an error at once; names are the view's own, nothing global; - what the application sets is taken into the view on the service's thread (libdmview_update()), running the view's .change handlers; what the view sets itself is what the application reads; - events the view emits (EMIT "name", n) queue in the claim (16, the oldest dropped and counted) for libdmview_wait_event(). Claims are objects of their own now, so a thread waiting for events keeps one until it is done even when it is released. The dmview service attaches the view it shows to the display's newest claim (libdmview_attach()). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This was referenced Oct 11, 2026
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Summary
A claim is now the channel between the application and the view it claimed the display for (format 0.6):
.propvariables the application sets and reads by name withlibdmview_prop_set_int/_set_string/_get_int/_get_string. They are read from the view file at claim time, so a wrong name or type fails immediately. Names belong to the view; nothing is global.libdmview_update(), latency ≤ 100 ms) and runs the view's.changehandlers.EMIT "name", nqueues in the claim (16 entries, the oldest dropped and counted indropped) forlibdmview_wait_event().libdmview_attach()).Used by carhmi-demo's MP3 player (track list, play/pause, progress driven from C, buttons sending events).
Order
Needs todmv with format 0.6 released (choco-technologies/todmv - feature/claim-channel) for the test fixtures.
Test plan
ctest: 26/26, includinglibdmview_claims_are_channels🤖 Generated with Claude Code