fix: zoom taking too long after clicking a spot

internal/cat/flex.go

@@ -54,6 +54,7 @@ type Flex struct {
 	spotsEnabled bool           // push cluster spots + manage the panadapter overlay
 	spotIdx      map[int]bool   // panadapter spot indices currently known to the radio
 	pendingSpot  map[int]string // seq → callsign, awaiting the spot index in the R response
+	pendingSplit map[int]bool   // seq → awaiting the new TX slice's index (split create)
 	spotCall     map[int]string // spot index → callsign (to fill the call on a panadapter click)
 	sentCmds     map[int]string // seq → command text, so an R<seq> error names the command
 
@@ -148,7 +149,7 @@ func NewFlex(host string, port int, spotsEnabled bool) *Flex {
 	return &Flex{
 		host: strings.TrimSpace(host), port: port,
 		slices: map[int]*flexSlice{}, spotsEnabled: spotsEnabled,
-		spotIdx: map[int]bool{}, pendingSpot: map[int]string{}, spotCall: map[int]string{},
+		spotIdx: map[int]bool{}, pendingSpot: map[int]string{}, spotCall: map[int]string{}, pendingSplit: map[int]bool{},
 		meterMeta: map[int]meterInfo{}, meterVal: map[int]float64{}, meterSub: map[int]bool{},
 		sentCmds: map[int]string{}, txSetAt: map[string]time.Time{},
 	}
@@ -314,7 +315,18 @@ func (f *Flex) reader(conn net.Conn) {
 					f.spotIdx[idx] = true
 				}
 			}
+			// A successful "slice create" for split returns the new slice's index;
+			// make that slice the transmitter so RX/TX are on separate slices.
+			splitSeq := f.pendingSplit[seq]
+			if splitSeq {
+				delete(f.pendingSplit, seq)
+			}
 			f.mu.Unlock()
+			if splitSeq && ok && len(parts) >= 3 {
+				if idx, e := strconv.Atoi(strings.TrimSpace(parts[2])); e == nil {
+					f.send(fmt.Sprintf("slice s %d tx=1", idx))
+				}
+			}
 		}
 	}
 	// Connection ended.
@@ -1050,6 +1062,11 @@ func (f *Flex) FlexState() FlexTXState {
 		CWSidetone:     f.tx.cwSidetone,
 		CWMonLevel:     f.tx.cwMonLevel,
 	}
+	if rx, tx := f.pickSlicesLocked(); rx != nil && tx != nil && rx != tx && rx.freqHz != tx.freqHz {
+		st.Split = true
+		st.RXFreqHz = rx.freqHz
+		st.TXFreqHz = tx.freqHz
+	}
 	if _, rx := f.rxSliceLocked(); rx != nil {
 		st.RXAvail = true
 		st.Mode = strings.ToUpper(rx.mode)
@@ -1170,14 +1187,73 @@ func (f *Flex) SetAudioLevel(l int) error   { return f.sendSlice("audio_level",
 func (f *Flex) SetMute(on bool) error       { return f.sendSlice("audio_mute", boolFlex(on)) }
 func (f *Flex) SetRXAntenna(a string) error { return f.sendSlice("rxant", a) }
 func (f *Flex) SetTXAntenna(a string) error { return f.sendSlice("txant", a) }
-func (f *Flex) SetNB(on bool) error         { return f.sendSlice("nb", boolFlex(on)) }
-func (f *Flex) SetNBLevel(l int) error      { return f.sendSlice("nb_level", clampLevel(l)) }
-func (f *Flex) SetNR(on bool) error         { return f.sendSlice("nr", boolFlex(on)) }
-func (f *Flex) SetNRLevel(l int) error      { return f.sendSlice("nr_level", clampLevel(l)) }
-func (f *Flex) SetANF(on bool) error        { return f.sendSlice("anf", boolFlex(on)) }
-func (f *Flex) SetANFLevel(l int) error     { return f.sendSlice("anf_level", clampLevel(l)) }
-func (f *Flex) SetAPF(on bool) error        { return f.sendSlice("apf", boolFlex(on)) }
-func (f *Flex) SetAPFLevel(l int) error     { return f.sendSlice("apf_level", clampLevel(l)) }
+
+// SetSplit toggles 2-slice split like SmartSDR's SPLIT button. ON creates a TX
+// slice at RX freq + offset (+1 kHz on CW, +5 kHz otherwise) and makes it the
+// transmitter; OFF removes the extra TX slice and returns to simplex (RX slice
+// transmits again).
+func (f *Flex) SetSplit(on bool) error {
+	f.mu.Lock()
+	if f.conn == nil {
+		f.mu.Unlock()
+		return fmt.Errorf("flex: not connected")
+	}
+	rx, tx := f.pickSlicesLocked()
+	rxIdx, txIdx := -1, -1
+	for i, s := range f.slices {
+		if s == rx {
+			rxIdx = i
+		}
+		if s == tx {
+			txIdx = i
+		}
+	}
+	alreadySplit := rx != nil && tx != nil && rx != tx
+	var rxFreq int64
+	var rxMode, rxAnt string
+	if rx != nil {
+		rxFreq, rxMode, rxAnt = rx.freqHz, rx.mode, rx.rxAnt
+	}
+	f.mu.Unlock()
+
+	if on {
+		if alreadySplit || rx == nil {
+			return nil // already split (or no slice)
+		}
+		offset := int64(5000)
+		if strings.HasPrefix(strings.ToUpper(rxMode), "CW") {
+			offset = 1000
+		}
+		cmd := fmt.Sprintf("slice create freq=%.6f mode=%s", float64(rxFreq+offset)/1e6, rxMode)
+		if rxAnt != "" {
+			cmd += " ant=" + rxAnt
+		}
+		if seq := f.send(cmd); seq > 0 {
+			f.mu.Lock()
+			f.pendingSplit[seq] = true // mark the new slice TX once its index returns
+			f.mu.Unlock()
+		}
+		return nil
+	}
+	if !alreadySplit {
+		return nil
+	}
+	if txIdx >= 0 {
+		f.send(fmt.Sprintf("slice remove %d", txIdx))
+	}
+	if rxIdx >= 0 {
+		f.send(fmt.Sprintf("slice s %d tx=1", rxIdx))
+	}
+	return nil
+}
+func (f *Flex) SetNB(on bool) error     { return f.sendSlice("nb", boolFlex(on)) }
+func (f *Flex) SetNBLevel(l int) error  { return f.sendSlice("nb_level", clampLevel(l)) }
+func (f *Flex) SetNR(on bool) error     { return f.sendSlice("nr", boolFlex(on)) }
+func (f *Flex) SetNRLevel(l int) error  { return f.sendSlice("nr_level", clampLevel(l)) }
+func (f *Flex) SetANF(on bool) error    { return f.sendSlice("anf", boolFlex(on)) }
+func (f *Flex) SetANFLevel(l int) error { return f.sendSlice("anf_level", clampLevel(l)) }
+func (f *Flex) SetAPF(on bool) error    { return f.sendSlice("apf", boolFlex(on)) }
+func (f *Flex) SetAPFLevel(l int) error { return f.sendSlice("apf_level", clampLevel(l)) }
 
 // ── CW keyer controls (top-level "cw" commands) ──