Event capture and display tools.

This is meant to be used in swatches, to display the events and callbacks generated by a component as part of the swatch. The usage pattern is described in the comments (in both places).

Naturally, this has its own swatch.

1 files changed, 22 insertions, 0 deletions

diff --git a/ui/lib/swatch/event-capture.svelte.js b/ui/lib/swatch/event-capture.svelte.js
new file mode 100644
index 0000000..32c0f39
--- /dev/null
+++ b/ui/lib/swatch/event-capture.svelte.js
@@ -0,0 +1,22 @@
+/*
+ * The interface exposed by this class is designed to closely match the interface expected by
+ * the `EventLog` component, so that you can do this:
+ *
+ *    let capture = $state(new EventCapture());
+ *    const someEvent = capture.on('someEvent');
+ *
+ *    // …
+ *
+ *    <EventLog events={capture.events} clear={capture.clear.bind(capture)} />
+ */
+export default class EventCapture {
+  events = $state([]);
+
+  on(event) {
+    return (...args) => this.events.push({ event, args });
+  }
+
+  clear() {
+    this.events = [];
+  }
+}