24 lines
903 B
Go
24 lines
903 B
Go
package evidence
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// foregroundTracker remembers the last observed foreground window so the
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// Windows polling Source emits only on change. hwnd is held as uintptr so this
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// file stays platform-neutral (it must build and test on Linux).
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type foregroundTracker struct {
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primed bool
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available bool
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hwnd uintptr
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title string
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}
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// changed reports whether (available, hwnd, title) differs from the last
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// observation and records the new values. The first call always returns true.
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// Callers pass the zero values (hwnd 0, title "") when available is false, so a
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// steady "no foreground window" run does not re-emit.
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func (t *foregroundTracker) changed(available bool, hwnd uintptr, title string) bool {
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if t.primed && available == t.available && hwnd == t.hwnd && title == t.title {
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return false
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}
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t.primed, t.available, t.hwnd, t.title = true, available, hwnd, title
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return true
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}
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