From a160605fc1440dd913d5596f240e3649bcaba8c2 Mon Sep 17 00:00:00 2001
From: Florian Thienel <ftl@thecodingflow.com>
Date: Sun, 26 May 2024 14:39:21 +0200
Subject: [PATCH] clear the entry fields if the frequency is changed by more
 than 250 Hz

---
 core/entry/entry.go | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/core/entry/entry.go b/core/entry/entry.go
index e653b98..1559d72 100644
--- a/core/entry/entry.go
+++ b/core/entry/entry.go
@@ -3,6 +3,7 @@ package entry
 import (
 	"fmt"
 	"log"
+	"math"
 	"strconv"
 	"strings"
 
@@ -13,6 +14,10 @@ import (
 	"github.com/ftl/hellocontest/core/ticker"
 )
 
+const (
+	jumpThreshold core.Frequency = 250 // Hz
+)
+
 // View represents the visual part of the QSO data entry.
 type View interface {
 	SetUTC(string)
@@ -430,8 +435,17 @@ func (c *Controller) VFOFrequencyChanged(frequency core.Frequency) {
 	if c.selectedFrequency == frequency {
 		return
 	}
+	jump := math.Abs(float64(c.selectedFrequency-frequency)) > float64(jumpThreshold)
 	c.selectedFrequency = frequency
 	c.view.SetFrequency(c.selectedFrequency)
+
+	if jump {
+		c.asyncRunner(func() {
+			c.Clear()
+			c.activeField = core.CallsignField
+			c.view.SetActiveField(c.activeField)
+		})
+	}
 }
 
 func (c *Controller) bandSelected(s string) {