52 lines
1.4 KiB
Go
52 lines
1.4 KiB
Go
//go:build windows
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package evidence
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import (
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"context"
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"time"
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"antidrift/internal/winapi"
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)
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// pollInterval is how often the Windows sensor samples the foreground window.
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// ~1s latency on a window switch is immaterial for a focus tracker, and polling
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// avoids the message-loop/callback machinery a SetWinEventHook source needs.
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const pollInterval = 750 * time.Millisecond
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// NewSource returns the Windows active-window sensor (polling).
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func NewSource() Source { return windowsSource{} }
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type windowsSource struct{}
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// Watch emits the current window immediately, then samples every pollInterval,
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// emitting only when the foreground window or its title changes. A read with no
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// foreground window yields an Unavailable snapshot (once, until it recovers). It
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// runs until ctx is cancelled. It never panics the daemon.
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func (windowsSource) Watch(ctx context.Context, onChange func(WindowSnapshot)) {
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var tr foregroundTracker
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poll := func() {
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hwnd, title, class, ok := winapi.ForegroundWindow()
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if !tr.changed(ok, hwnd, title) {
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return
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}
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if !ok {
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onChange(unavailable("no foreground window"))
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return
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}
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onChange(WindowSnapshot{Title: title, Class: class, Health: EvidenceHealth{Available: true}})
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}
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poll() // immediate current window
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ticker := time.NewTicker(pollInterval)
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defer ticker.Stop()
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for {
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select {
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case <-ctx.Done():
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return
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case <-ticker.C:
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poll()
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}
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}
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}
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