Minimum QRB filter; the station map follows the station filters (#21) (#132)

* Add a minimum QRB filter to the station filter bar (#21)

Next to "Show only QRB [km] <=" the bar gets "Show only QRB [km] >": it
hides every station up to the entered distance. With both switched on the
list keeps a range, min < QRB <= max. The minimum is exclusive, as the
issue asks, so the two filters split the list without overlap at the same
value. A station without a known QRB is hidden while either is on, as the
maximum already did. The value lives in the bar for the running session
only, like the maximum, and the station map follows through activeFilters.

The distance check moves from the controller predicate into
StationFilterState.acceptsQrb so it can be tested; the maximum keeps its
behaviour (null or > max is hidden).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Document the minimum QRB filter (#21)

Changelog v1.50 under New, the filter tables of the user interface pages,
the distance filter section of the feature pages, and the station filter
page of the website.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Let the first filter bar row wrap instead of clipping (#21)

With both QRB filters the first row of the station filter bar no longer
fits a narrow station pane, and as a plain Row it cut the bearing buttons
off at the right edge. It is a FlowRow now. Reset, the QRB pair, the QTF
controls and the bearings each move to the next line as one group; the
QRB pair and the bearings only break up inside their group when even the
group is wider than the pane. Separators in the wrapping row have a fixed
height, because a flow row line has no intrinsic height to fill.

A screen test at 300 dp checks that every bearing button, both QRB labels
and fields and the QTF label are displayed and end inside the bar.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Refuse NaN, Infinity and negatives in the QRB filter fields (#21)

toDoubleOrNull also reads "NaN" and "Infinity": a pasted "Infinity" as
the minimum hid every station, "NaN" let every one through, and the
maximum field had the same hole before. Both QRB fields now go through
parseQrbKm, which takes only finite, non-negative distances; anything
else leaves the field at its last valid value.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Let the station map follow the station filters (#21)

The Compose map built its markers from all station rows, so no filter
reached it, although its status line reported "filtered view active".
The JavaFX map, up to beta-v1.50.0-beta-001, took the sorted, filtered
list (StationMapBridge.refreshNow), so this is a regression of the
Compose port that never shipped. The markers now come from the rows the
list shows, and the filter is a key of the remembered markers so a
filter change redraws them. A selected station that a filter hides gets
no marker, as in the JavaFX map.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Filter again on redraw; no path analysis for a hidden station (#21)

DataTableState.visibleRows caches the filtered rows, and forceRedraw only
bumped contentRevision. The filter reads fields that change in place
(QRB, worked and QRV flags, last activity), so a redraw could hand back
rows filtered before the change -- in the list and, since the map draws
the same rows, on the map. forceRedraw now drops the cache, and
visibleRows reads contentRevision so a reader recomputes after it. In the
running application the user-list refresh also sets a new row filter,
which dropped the cache before; this makes the redraw itself sufficient.

A selected station without a marker -- hidden by a filter, or without a
locator -- no longer starts a path analysis: the map used to set
"Loading" with an empty target and send the request. The analysis is
cleared instead, and the effect re-runs when the station's marker
appears or disappears.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

app-desktop/src/main/i18n/strings_de.properties

@@ -235,6 +235,7 @@ column.lastQrgTx=Letzte QRG TX
 filter.find=Suchen...
 filter.reset=Filter zurücksetzen
 filter.showOnlyQrb=Nur QRB [km] <=
+filter.showOnlyQrbAbove=Nur QRB [km] >
 filter.showOnlyQtf=Nur QTF:
 filter.hideWorked=Gearbeitete ausblenden:
 filter.inactiveStations=Inaktive Stationen

app-desktop/src/main/i18n/strings_en.properties

@@ -244,6 +244,7 @@ column.lastQrgTx=Last QRG TX
 filter.find=Find...
 filter.reset=Reset filters
 filter.showOnlyQrb=Show only QRB [km] <=
+filter.showOnlyQrbAbove=Show only QRB [km] >
 filter.showOnlyQtf=Show only QTF:
 filter.hideWorked=Hide worked:
 filter.inactiveStations=Inactive stations

app-desktop/src/main/java/kst4contest/view/Kst4ContestApplication.java

@@ -2628,10 +2628,7 @@ public class Kst4ContestApplication implements StatusUpdateListener, SettingsHos
 			if (state.isOn(kst4contest.view.compose.StationFilter.NEW_BANDS) && !isNewBandOpportunity(member)) return false;
 			if (state.isOn(kst4contest.view.compose.StationFilter.AIRSCOUT_NEXT_5_MIN) && !hasAsWindowInNextMinutes(member, 5)) return false;
 
-			if (state.isOn(kst4contest.view.compose.StationFilter.MAX_QRB)) {
+			if (!state.acceptsQrb(member.getQrb())) return false;
-				Double qrb = member.getQrb();
-				if (qrb == null || qrb > state.getMaxQrbKm()) return false;
-			}
 
 			if (state.isOn(kst4contest.view.compose.StationFilter.QTF)) {
 				Double qtf = member.getQTFdirection();

app-desktop/src/main/kotlin/kst4contest/view/compose/DataTableState.kt

@@ -275,7 +275,14 @@ class DataTableState<T>(
     var contentRevision by mutableStateOf(0)
         private set
 
+    /**
+     * Redraws the rows and filters them again. The filter reads mutable row fields (a
+     * station's QRB, worked and QRV flags, its last activity), so a cached [visibleRows]
+     * from before the change could keep a row the filter now excludes, or hide one it
+     * now lets through -- in the list and in the station map, which draws the same rows.
+     */
     fun forceRedraw() {
+        invalidateOrder()
         contentRevision++
     }
 
@@ -299,6 +306,7 @@ class DataTableState<T>(
              */
             val currentRows = rows
             val currentFilter = rowFilter
+            contentRevision // read for the subscription: forceRedraw drops the cache
             val currentColumn = sortedColumnId
             val ascending = sortAscending
 

app-desktop/src/main/kotlin/kst4contest/view/compose/StationFilterBar.kt

@@ -48,11 +48,19 @@ fun StationFilterBar(
         modifier = modifier.fillMaxWidth().padding(horizontal = 2.dp, vertical = 1.dp),
         verticalArrangement = Arrangement.spacedBy(1.dp),
     ) {
-        // ROW 1: Reset | QRB | QTF + bearings
+        /*
-        Row(
+         * ROW 1: Reset | QRB max + min | QTF | bearings
-            modifier = Modifier.fillMaxWidth().height(IntrinsicSize.Min),
+         *
+         * It wraps (#21): with both QRB filters the line no longer fits a narrow station
+         * pane, and a plain row cut the bearing buttons off at the right edge. Each group
+         * stays together on its line; only the QRB pair and the bearings may break up
+         * inside their group when even that group is wider than the pane.
+         */
+        FlowRow(
+            modifier = Modifier.fillMaxWidth(),
             horizontalArrangement = Arrangement.spacedBy(4.dp),
-            verticalAlignment = Alignment.CenterVertically,
+            verticalArrangement = Arrangement.spacedBy(1.dp),
+            itemVerticalAlignment = Alignment.CenterVertically,
         ) {
             // Reset filters
             FilterButton(strings.filterReset, on = false, isAccent = true) {
@@ -60,65 +68,105 @@ fun StationFilterBar(
                 onChanged()
             }
 
-            VerticalSeparator()
+            // QRB maximum + minimum (#21): together they make a range, so they stay one group
-
+            FilterGroup {
-            // QRB checkbox + field
+                GroupSeparator()
-            CompactCheckbox(
+                FlowRow(
-                checked = filters.maxQrbEnabled,
+                    horizontalArrangement = Arrangement.spacedBy(4.dp),
-                onCheckedChange = {
+                    verticalArrangement = Arrangement.spacedBy(1.dp),
-                    filters.maxQrbEnabled = it
+                    itemVerticalAlignment = Alignment.CenterVertically,
-                    onChanged()
+                ) {
-                },
+                    FilterGroup {
-            )
+                        CompactCheckbox(
-            Text(strings.filterShowOnlyQrb, style = MaterialTheme.typography.bodySmall)
+                            checked = filters.maxQrbEnabled,
-            CompactTextField(
+                            onCheckedChange = {
-                value = if (filters.maxQrbKm.rem(1) == 0.0) filters.maxQrbKm.toInt().toString() else filters.maxQrbKm.toString(),
+                                filters.maxQrbEnabled = it
-                onValueChange = {
+                                onChanged()
-                    val parsed = it.toDoubleOrNull()
+                            },
-                    if (parsed != null) {
+                        )
-                        filters.maxQrbKm = parsed
+                        Text(strings.filterShowOnlyQrb, style = MaterialTheme.typography.bodySmall)
-                        if (filters.maxQrbEnabled) onChanged()
+                        CompactTextField(
-                    } else if (it.isEmpty()) {
+                            value = if (filters.maxQrbKm.rem(1) == 0.0) filters.maxQrbKm.toInt().toString() else filters.maxQrbKm.toString(),
-                        filters.maxQrbKm = 0.0
+                            onValueChange = {
-                        if (filters.maxQrbEnabled) onChanged()
+                                val parsed = parseQrbKm(it)
+                                if (parsed != null) {
+                                    filters.maxQrbKm = parsed
+                                    if (filters.maxQrbEnabled) onChanged()
+                                } else if (it.isEmpty()) {
+                                    filters.maxQrbKm = 0.0
+                                    if (filters.maxQrbEnabled) onChanged()
+                                }
+                            },
+                            modifier = Modifier.width(50.dp)
+                        )
                     }
-                },
+                    FilterGroup {
-                modifier = Modifier.width(50.dp)
+                        CompactCheckbox(
-            )
+                            checked = filters.minQrbEnabled,
-
+                            onCheckedChange = {
-            VerticalSeparator()
+                                filters.minQrbEnabled = it
-
+                                onChanged()
-            // QTF checkbox + field + bearings
+                            },
-            CompactCheckbox(
+                        )
-                checked = filters.qtfEnabled,
+                        Text(strings.filterShowOnlyQrbAbove, style = MaterialTheme.typography.bodySmall)
-                onCheckedChange = {
+                        CompactTextField(
-                    filters.qtfEnabled = it
+                            value = if (filters.minQrbKm.rem(1) == 0.0) filters.minQrbKm.toInt().toString() else filters.minQrbKm.toString(),
-                    onChanged()
+                            onValueChange = {
-                },
+                                val parsed = parseQrbKm(it)
-            )
+                                if (parsed != null) {
-            Text(strings.filterShowOnlyQtf, style = MaterialTheme.typography.bodySmall)
+                                    filters.minQrbKm = parsed
-            CompactTextField(
+                                    if (filters.minQrbEnabled) onChanged()
-                value = if (filters.qtfDegrees.rem(1) == 0.0) filters.qtfDegrees.toInt().toString() else filters.qtfDegrees.toString(),
+                                } else if (it.isEmpty()) {
-                onValueChange = {
+                                    filters.minQrbKm = 0.0
-                    val parsed = it.toDoubleOrNull()
+                                    if (filters.minQrbEnabled) onChanged()
-                    if (parsed != null) {
+                                }
-                        filters.qtfDegrees = parsed
+                            },
-                        filters.bearing = null
+                            modifier = Modifier.width(50.dp)
-                        if (filters.qtfEnabled) onChanged()
+                        )
-                    } else if (it.isEmpty()) {
-                        filters.qtfDegrees = 0.0
-                        filters.bearing = null
-                        if (filters.qtfEnabled) onChanged()
                     }
-                },
+                }
-                modifier = Modifier.width(50.dp)
+            }
-            )
-            Text("± BW/2", style = MaterialTheme.typography.bodySmall)
 
-            Bearing.entries.forEach { bearing ->
+            // QTF checkbox + field
-                FilterButton(bearing.name, on = filters.bearing == bearing) {
+            FilterGroup {
-                    filters.toggleBearing(bearing)
+                GroupSeparator()
-                    onChanged()
+                CompactCheckbox(
+                    checked = filters.qtfEnabled,
+                    onCheckedChange = {
+                        filters.qtfEnabled = it
+                        onChanged()
+                    },
+                )
+                Text(strings.filterShowOnlyQtf, style = MaterialTheme.typography.bodySmall)
+                CompactTextField(
+                    value = if (filters.qtfDegrees.rem(1) == 0.0) filters.qtfDegrees.toInt().toString() else filters.qtfDegrees.toString(),
+                    onValueChange = {
+                        val parsed = it.toDoubleOrNull()
+                        if (parsed != null) {
+                            filters.qtfDegrees = parsed
+                            filters.bearing = null
+                            if (filters.qtfEnabled) onChanged()
+                        } else if (it.isEmpty()) {
+                            filters.qtfDegrees = 0.0
+                            filters.bearing = null
+                            if (filters.qtfEnabled) onChanged()
+                        }
+                    },
+                    modifier = Modifier.width(50.dp)
+                )
+                Text("± BW/2", style = MaterialTheme.typography.bodySmall)
+            }
+
+            // Bearings
+            FlowRow(
+                horizontalArrangement = Arrangement.spacedBy(4.dp),
+                verticalArrangement = Arrangement.spacedBy(1.dp),
+            ) {
+                Bearing.entries.forEach { bearing ->
+                    FilterButton(bearing.name, on = filters.bearing == bearing) {
+                        filters.toggleBearing(bearing)
+                        onChanged()
+                    }
                 }
             }
         }
@@ -235,6 +283,31 @@ private fun FilterButton(label: String, on: Boolean, isAccent: Boolean = false,
     }
 }
 
+/** Controls that belong together and move to the next line of a wrapping row as one. */
+@Composable
+private fun FilterGroup(content: @Composable () -> Unit) {
+    Row(
+        horizontalArrangement = Arrangement.spacedBy(4.dp),
+        verticalAlignment = Alignment.CenterVertically,
+    ) {
+        content()
+    }
+}
+
+/**
+ * The group divider for a wrapping row. A fixed height, because [VerticalSeparator] fills
+ * the row's intrinsic height, which a line of a flow row does not offer.
+ */
+@Composable
+private fun GroupSeparator() {
+    Box(
+        modifier = Modifier
+            .width(Density.HAIRLINE)
+            .height(18.dp)
+            .background(MaterialTheme.colorScheme.outline),
+    )
+}
+
 /** Thin vertical separator matching JavaFX's group dividers. */
 @Composable
 private fun VerticalSeparator() {

app-desktop/src/main/kotlin/kst4contest/view/compose/StationFilterState.kt

@@ -18,6 +18,7 @@ enum class StationFilter {
     NEW_BANDS,
     AIRSCOUT_NEXT_5_MIN,
     MAX_QRB,
+    MIN_QRB,
     QTF,
     SEARCH_TEXT,
     HIDE_INACTIVE,
@@ -33,6 +34,17 @@ enum class StationFilter {
     HIDE_WORKED_3,
 }
 
+/**
+ * What a QRB field of the filter bar makes of the text typed into it: a distance in km, or
+ * `null` when the text is none.
+ *
+ * `toDouble` alone also reads "NaN" and "Infinity", and a pasted "Infinity" as the minimum
+ * hid every station while "NaN" let every one through. A negative distance means nothing
+ * either. All of these are refused, so the field keeps its last valid value (#21).
+ */
+internal fun parseQrbKm(text: String): Double? =
+    text.toDoubleOrNull()?.takeIf { it.isFinite() && it >= 0.0 }
+
 /** The bands the "hide worked" row offers, under the labels the bar shows. */
 enum class WorkedBandFilter(val label: String, val filter: StationFilter, val modelBand: kst4contest.model.Band) {
     B_50("50", StationFilter.HIDE_WORKED_50, kst4contest.model.Band.B_50),
@@ -99,6 +111,16 @@ class StationFilterState {
     /** Only meaningful while [maxQrbEnabled]; a distance alone filters nothing. */
     var maxQrbKm: Double by mutableStateOf(0.0)
 
+    var minQrbEnabled: Boolean
+        get() = isOn(StationFilter.MIN_QRB)
+        set(value) = switch(StationFilter.MIN_QRB, value)
+
+    /**
+     * Only meaningful while [minQrbEnabled]. Exclusive: a station exactly this far away is
+     * hidden, so that "QRB > 300" and "QRB <= 300" split the list without overlap (#21).
+     */
+    var minQrbKm: Double by mutableStateOf(0.0)
+
     var qtfEnabled: Boolean
         get() = isOn(StationFilter.QTF)
         set(value) = switch(StationFilter.QTF, value)
@@ -130,6 +152,23 @@ class StationFilterState {
 
     fun isOn(filter: StationFilter): Boolean = switched[filter] == true
 
+    /**
+     * Whether a station [qrb] km away passes the distance filters that are switched on.
+     *
+     * Both on make a range: `min < qrb <= max`. A station without a known distance is
+     * hidden as soon as either is on — `null` is unknown, not zero, and an unknown distance
+     * can be in neither range.
+     */
+    fun acceptsQrb(qrb: Double?): Boolean {
+        val max = isOn(StationFilter.MAX_QRB)
+        val min = isOn(StationFilter.MIN_QRB)
+        if (!max && !min) return true
+        if (qrb == null) return false
+        if (max && qrb > maxQrbKm) return false
+        if (min && qrb <= minQrbKm) return false
+        return true
+    }
+
     fun setHideWorkedOn(band: WorkedBandFilter, hide: Boolean) = switch(band.filter, hide)
 
     fun isHideWorkedOn(band: WorkedBandFilter): Boolean = isOn(band.filter)

app-desktop/src/main/kotlin/kst4contest/view/compose/map/StationMapWindow.kt

@@ -129,7 +129,19 @@ object StationMapWindow {
             val antennaBeamWidthDeg = mainWindowState.prefs.stn_antennaBeamWidthDeg
             val maxQrbKm = mainWindowState.prefs.stn_maxQRBDefault
 
-            val markers by remember(mainWindowState.stations.rows, mainWindowState.stations.contentRevision, selectedMember, mainWindowState.activeBands) {
+            /*
+             * The markers are the stations the list shows, not all of them (#21): the
+             * JavaFX map took the sorted, filtered list (StationMapBridge.refreshNow), and
+             * the status line below already says "filtered view active". A selected
+             * station that a filter hides gets no marker either, as it did there.
+             */
+            val markers by remember(
+                mainWindowState.stations.rows,
+                mainWindowState.stations.rowFilter,
+                mainWindowState.stations.contentRevision,
+                selectedMember,
+                mainWindowState.activeBands,
+            ) {
                 derivedStateOf {
                     val builder = MapCallsignRawSnapshotBuilder()
                     val activeBands = mainWindowState.activeBands
@@ -140,7 +152,7 @@ object StationMapWindow {
                     }
 
                     builder.buildSnapshots(
-                        mainWindowState.stations.rows,
+                        mainWindowState.stations.visibleRows,
                         selectedMember,
                         bandSet
                     )
@@ -152,17 +164,29 @@ object StationMapWindow {
             // Read through updated state so a caller passing a new lambda is never served a stale one.
             val currentPathAnalysis by rememberUpdatedState(pathAnalysis)
 
-            LaunchedEffect(selectedMember) {
+            /*
+             * Whether the selected station has a marker. A filter can hide it (#21), and a
+             * station without a locator never has one; then there is nothing to analyse.
+             */
+            val selectedHasMarker = selectedMember != null &&
+                markers.any { it.callSignRaw() == selectedMember.callSignRaw }
+
+            LaunchedEffect(selectedMember, selectedHasMarker) {
                 if (selectedMember == null) {
                     pathAnalysisResult = null
                     return@LaunchedEffect
                 }
-                
+
+                val selectedSnapshot = markers.find { it.callSignRaw() == selectedMember.callSignRaw }
+                if (selectedSnapshot == null) {
+                    // No marker: no request, and no "Loading" for a station the map does not show.
+                    pathAnalysisResult = null
+                    return@LaunchedEffect
+                }
+
                 val analysis = currentPathAnalysis()
                 if (analysis != null) {
-                    val selectedSnapshot = markers.find { it.callSignRaw() == selectedMember.callSignRaw }
+                    if (selectedSnapshot.hasUsablePosition()) {
-                    
-                    if (selectedSnapshot != null && selectedSnapshot.hasUsablePosition()) {
                         /*
                          * Pan to the station and leave the zoom alone. The Leaflet map
                          * did exactly this (focusCallsignRaw) and touched the zoom only
@@ -183,8 +207,8 @@ object StationMapWindow {
 
                     pathAnalysisResult = PathAnalysisResult.loading(
                         prefs.stn_loginLocatorMainCat,
-                        selectedSnapshot?.locator6() ?: "",
+                        selectedSnapshot.locator6(),
-                        selectedSnapshot?.callSignRaw() ?: ""
+                        selectedSnapshot.callSignRaw()
                     )
                     
                     analysis.request(selectedMember, selectedSnapshot) { result ->

app-desktop/src/test/kotlin/kst4contest/view/compose/DataTableStateTest.kt

@@ -322,6 +322,26 @@ class DataTableStateTest {
 
         assertSame(kept, table.selectedRow)
     }
+
+    /**
+     * The filter reads fields of the row objects, which change in place: a station's QRB,
+     * its worked flags, its last activity. forceRedraw is how the application says so, and
+     * the cached visible rows must be filtered again after it (#21).
+     */
+    @Test
+    fun `a redraw filters rows again whose fields changed in place`() {
+        val table = stationTable()
+        val moving = Station("DN9APW", 100)
+        table.replaceRows(listOf(moving, Station("DO5AMF", 400)))
+        table.rowFilter = { it.qrb > 300 }
+        assertEquals(listOf("DO5AMF"), table.visibleRows.map { it.callSign })
+
+        moving.qrb = 500
+        table.forceRedraw()
+
+        assertEquals(listOf("DN9APW", "DO5AMF"), table.visibleRows.map { it.callSign }.sorted(),
+            "the cached rows from before the change were handed back")
+    }
 }
 
 /**

app-desktop/src/test/kotlin/kst4contest/view/compose/StationFilterBarScreenTest.kt

@@ -0,0 +1,157 @@
+package kst4contest.view.compose
+
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.width
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.test.ComposeUiTest
+import androidx.compose.ui.test.ExperimentalTestApi
+import androidx.compose.ui.test.assertIsDisplayed
+import androidx.compose.ui.test.assertIsOff
+import androidx.compose.ui.test.assertIsOn
+import androidx.compose.ui.test.assertTextEquals
+import androidx.compose.ui.test.onNodeWithText
+import androidx.compose.ui.test.performClick
+import androidx.compose.ui.test.runComposeUiTest
+import androidx.compose.ui.unit.dp
+import kst4contest.model.Band
+import kst4contest.view.compose.tabs.checkBeside
+import kst4contest.view.compose.tabs.fieldBeside
+import kst4contest.view.compose.tabs.showTab
+import kst4contest.view.compose.tabs.toggle
+import kst4contest.view.compose.tabs.type
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Assertions.assertFalse
+import org.junit.jupiter.api.Assertions.assertTrue
+import org.junit.jupiter.api.Test
+import java.util.EnumSet
+
+/**
+ * The QRB part of the station filter bar, drawn (#21).
+ *
+ * [StationFilterStateTest] pins which distances pass; this pins that the two QRB controls
+ * on screen write into their own filter and not into the other one. The two labels differ
+ * only in `<=` and `>`, so a swapped binding would look right and filter the wrong side.
+ *
+ * Headless: only a composition, no window.
+ */
+@OptIn(ExperimentalTestApi::class)
+class StationFilterBarScreenTest {
+
+    private val maxLabel = "Show only QRB [km] <="
+    private val minLabel = "Show only QRB [km] >"
+
+    private class Bar {
+        val filters = StationFilterState()
+        var changes = 0
+    }
+
+    private fun ComposeUiTest.showBar(): Bar {
+        val bar = Bar()
+        showTab {
+            StationFilterBar(
+                filters = bar.filters,
+                activeBands = EnumSet.of(Band.B_144),
+                onChanged = { bar.changes++ },
+            )
+        }
+        return bar
+    }
+
+    @Test
+    fun theMinimumQrbControlsWriteTheMinimumFilterOnly() = runComposeUiTest {
+        val bar = showBar()
+
+        type(minLabel, "300")
+        toggle(minLabel)
+
+        assertTrue(bar.filters.minQrbEnabled)
+        assertEquals(300.0, bar.filters.minQrbKm)
+        assertEquals(setOf(StationFilter.MIN_QRB), bar.filters.activeFilters)
+        assertEquals(0.0, bar.filters.maxQrbKm, "the minimum field wrote into the maximum")
+        assertTrue(bar.changes > 0, "switching the filter on did not reapply the filters")
+        checkBeside(minLabel).assertIsOn()
+        checkBeside(maxLabel).assertIsOff()
+    }
+
+    @Test
+    fun bothQrbControlsTogetherMakeARange() = runComposeUiTest {
+        val bar = showBar()
+
+        type(maxLabel, "500")
+        toggle(maxLabel)
+        type(minLabel, "200")
+        toggle(minLabel)
+
+        assertEquals(setOf(StationFilter.MAX_QRB, StationFilter.MIN_QRB), bar.filters.activeFilters)
+        fieldBeside(maxLabel).assertTextEquals("500")
+        fieldBeside(minLabel).assertTextEquals("200")
+        assertFalse(bar.filters.acceptsQrb(150.0))
+        assertTrue(bar.filters.acceptsQrb(350.0))
+        assertFalse(bar.filters.acceptsQrb(650.0))
+    }
+
+    /** A pasted "Infinity" as the minimum hid every station, a "NaN" let every one through. */
+    @Test
+    fun theQrbFieldsKeepTheirValueWhenTheTextIsNoDistance() = runComposeUiTest {
+        val bar = showBar()
+        type(maxLabel, "500")
+        type(minLabel, "200")
+
+        listOf("Infinity", "NaN", "-5").forEach { text ->
+            type(maxLabel, text)
+            type(minLabel, text)
+        }
+
+        assertEquals(500.0, bar.filters.maxQrbKm)
+        assertEquals(200.0, bar.filters.minQrbKm)
+        fieldBeside(maxLabel).assertTextEquals("500")
+        fieldBeside(minLabel).assertTextEquals("200")
+    }
+
+    @Test
+    fun resettingTheFiltersUnticksTheMinimumQrb() = runComposeUiTest {
+        val bar = showBar()
+        toggle(minLabel)
+        checkBeside(minLabel).assertIsOn()
+
+        onNodeWithText("Reset filters").performClick()
+        waitForIdle()
+
+        checkBeside(minLabel).assertIsOff()
+        assertFalse(bar.filters.minQrbEnabled)
+    }
+
+    /**
+     * The first row used to be a plain row: with both QRB filters in it, a narrow station
+     * pane cut the bearing buttons off at the right edge. It wraps now, and every control
+     * has to stay on screen.
+     */
+    @Test
+    fun aNarrowBarWrapsInsteadOfCuttingControlsOff() = runComposeUiTest {
+        val filters = StationFilterState()
+        val width = 300.dp
+        setContent {
+            Kst4ContestTheme(darkMode = false, baseFontSizeSp = 12f) {
+                Box(Modifier.width(width)) {
+                    StationFilterBar(filters = filters, activeBands = EnumSet.of(Band.B_144), onChanged = {})
+                }
+            }
+        }
+        waitForIdle()
+
+        val limit = with(density) { width.toPx() }
+        val controls = Bearing.entries.map { onNodeWithText(it.name) } +
+            listOf(
+                onNodeWithText(maxLabel),
+                onNodeWithText(minLabel),
+                onNodeWithText("Show only QTF:"),
+                fieldBeside(maxLabel),
+                fieldBeside(minLabel),
+            )
+        controls.forEach { node ->
+            node.assertIsDisplayed()
+            val right = node.fetchSemanticsNode().boundsInRoot.right
+            assertTrue(right <= limit + 0.5f, "a control ends at $right px, beyond the $limit px wide bar")
+        }
+    }
+}

app-desktop/src/test/kotlin/kst4contest/view/compose/StationFilterStateTest.kt

@@ -131,6 +131,108 @@ class StationFilterStateTest {
         assertEquals(setOf(StationFilter.MAX_QRB), filters.activeFilters)
     }
 
+    @Test
+    fun `the minimum QRB filter needs its own switch`() {
+        val filters = StationFilterState()
+
+        filters.minQrbKm = 300.0
+        assertTrue(filters.activeFilters.isEmpty(), "a distance alone filters nothing")
+
+        filters.minQrbEnabled = true
+        assertEquals(setOf(StationFilter.MIN_QRB), filters.activeFilters)
+    }
+
+    @Test
+    fun `resetting switches both QRB filters off`() {
+        val filters = StationFilterState()
+        filters.maxQrbEnabled = true
+        filters.minQrbEnabled = true
+
+        filters.reset()
+
+        assertTrue(filters.activeFilters.isEmpty())
+        assertFalse(filters.minQrbEnabled)
+        assertFalse(filters.maxQrbEnabled)
+    }
+
+    @Test
+    fun `without a QRB filter every distance passes, an unknown one too`() {
+        val filters = StationFilterState()
+        filters.maxQrbKm = 100.0
+        filters.minQrbKm = 500.0
+
+        assertTrue(filters.acceptsQrb(50.0))
+        assertTrue(filters.acceptsQrb(1000.0))
+        assertTrue(filters.acceptsQrb(null))
+    }
+
+    /** The behaviour the controller predicate had before #21 moved it here. */
+    @Test
+    fun `the maximum QRB keeps stations up to and including the distance`() {
+        val filters = StationFilterState()
+        filters.maxQrbEnabled = true
+        filters.maxQrbKm = 300.0
+
+        assertTrue(filters.acceptsQrb(299.9))
+        assertTrue(filters.acceptsQrb(300.0))
+        assertFalse(filters.acceptsQrb(300.1))
+        assertFalse(filters.acceptsQrb(null), "an unknown distance is not a short one")
+    }
+
+    @Test
+    fun `the minimum QRB keeps only stations further away than the distance`() {
+        val filters = StationFilterState()
+        filters.minQrbEnabled = true
+        filters.minQrbKm = 300.0
+
+        assertFalse(filters.acceptsQrb(299.9))
+        assertFalse(filters.acceptsQrb(300.0), "the issue asks for QRB > X, so X itself is out")
+        assertTrue(filters.acceptsQrb(300.1))
+        assertFalse(filters.acceptsQrb(null), "an unknown distance is not a long one")
+    }
+
+    @Test
+    fun `both QRB filters together keep a distance range`() {
+        val filters = StationFilterState()
+        filters.minQrbEnabled = true
+        filters.minQrbKm = 200.0
+        filters.maxQrbEnabled = true
+        filters.maxQrbKm = 500.0
+
+        assertFalse(filters.acceptsQrb(200.0))
+        assertTrue(filters.acceptsQrb(200.1))
+        assertTrue(filters.acceptsQrb(500.0))
+        assertFalse(filters.acceptsQrb(500.1))
+        assertFalse(filters.acceptsQrb(null))
+    }
+
+    @Test
+    fun `a range with the minimum above the maximum keeps nothing`() {
+        val filters = StationFilterState()
+        filters.minQrbEnabled = true
+        filters.minQrbKm = 500.0
+        filters.maxQrbEnabled = true
+        filters.maxQrbKm = 200.0
+
+        listOf(100.0, 300.0, 600.0).forEach {
+            assertFalse(filters.acceptsQrb(it), "$it km passed an empty range")
+        }
+    }
+
+    @Test
+    fun `a QRB field reads plain distances`() {
+        assertEquals(300.0, parseQrbKm("300"))
+        assertEquals(12.5, parseQrbKm("12.5"))
+        assertEquals(0.0, parseQrbKm("0"))
+    }
+
+    @Test
+    fun `a QRB field refuses what is no distance`() {
+        listOf("NaN", "Infinity", "-Infinity", "-5", "abc", "").forEach {
+            assertNull(parseQrbKm(it), "\"$it\" was taken as a distance")
+        }
+    }
+
     @Test
     fun `a search text filters while it is there and stops when it is cleared`() {
         val filters = StationFilterState()

app-desktop/src/test/kotlin/kst4contest/view/compose/StationListScreenTest.kt

@@ -195,4 +195,30 @@ class StationListScreenTest {
         onNodeWithText("DL2BBB").assertDoesNotExist()
         assertEquals(null, state.selectedRow)
     }
+
+    /**
+     * A station's fields change in place and the application calls forceRedraw: the list
+     * filters again, so a station the filter now excludes leaves the screen (#21).
+     */
+    @Test
+    fun aRedrawAfterAFieldChangedFiltersTheListAgain() = runComposeUiTest {
+        val state = stationList()
+        val moving = station("DL1MOVE", qrb = 500.0)
+        show(state)
+        runOnIdle {
+            state.replaceRows(listOf(moving, station("DL2STAY", qrb = 800.0)))
+            state.rowFilter = { (it.qrb ?: 0.0) > 300.0 }
+        }
+        waitForIdle()
+        onNodeWithText("DL1MOVE").assertExists()
+
+        runOnIdle {
+            moving.qrb = 100.0
+            state.forceRedraw()
+        }
+        waitForIdle()
+
+        onNodeWithText("DL1MOVE").assertDoesNotExist()
+        onNodeWithText("DL2STAY").assertExists()
+    }
 }

app-desktop/src/test/kotlin/kst4contest/view/compose/map/StationMapWindowScreenTest.kt

@@ -4,7 +4,9 @@ import androidx.compose.ui.test.ComposeUiTest
 import androidx.compose.ui.test.ExperimentalTestApi
 import androidx.compose.ui.test.assertIsOff
 import androidx.compose.ui.test.assertIsOn
+import androidx.compose.ui.test.assertCountEquals
 import androidx.compose.ui.test.isToggleable
+import androidx.compose.ui.test.onAllNodesWithText
 import androidx.compose.ui.test.onNodeWithTag
 import androidx.compose.ui.test.onNodeWithText
 import androidx.compose.ui.test.performClick
@@ -381,4 +383,91 @@ class StationMapWindowScreenTest {
         onNode(isToggleable()).assertIsOn()
         assertEquals(true, prefs.isGUIstationMapClusteringEnabled)
     }
+
+    /**
+     * The map shows the stations the list shows (#21). The Compose map drew every station
+     * whatever the filter bar said, although its status line reported a filtered view; the
+     * JavaFX map took the filtered list. A filter switched on after the first draw has to
+     * take the marker away too, and a click where it stood selects nothing.
+     */
+    @Test
+    fun aStationTheFiltersHideHasNoMarker() = runComposeUiTest {
+        val state = windowState(prefs())
+        val near = station("DL1NEAR", 2, locator = "JO50JP").apply { qrb = 150.0 }
+        val far = station("DL2FAR", 2, locator = "JO62QM").apply { qrb = 600.0 }
+        val selectorCalls = mutableListOf<ChatMember?>()
+        state.stationSelector = { selectorCalls += it }
+
+        show(state, listOf(near, far), mapLookingAt("JO50JP", zoom = 12f))
+        onNodeWithText("Showing 2 visible stations").assertExists()
+
+        runOnIdle {
+            state.stationFilter.minQrbKm = 300.0
+            state.stationFilter.minQrbEnabled = true
+            state.stations.rowFilter = { state.stationFilter.acceptsQrb(it.qrb) }
+        }
+        waitForIdle()
+
+        onNodeWithText("Showing 1 visible stations | filtered view active").assertExists()
+
+        // The map looks straight at the hidden station: a click there finds no marker.
+        onNodeWithTag(StationMapWindow.MAP_CANVAS_TAG).performClick()
+        waitForIdle()
+        assertEquals(emptyList<ChatMember?>(), selectorCalls, "the hidden station still had a marker")
+    }
+
+    /** A station whose QRB changed in place leaves the map after the redraw, as it leaves the list. */
+    @Test
+    fun aRedrawAfterAFieldChangedFiltersTheMapAgain() = runComposeUiTest {
+        val state = windowState(prefs())
+        val moving = station("DL1MOVE", 2, locator = "JO50JP").apply { qrb = 500.0 }
+        val stay = station("DL2STAY", 2, locator = "JO62QM").apply { qrb = 800.0 }
+        state.stationFilter.minQrbKm = 300.0
+        state.stationFilter.minQrbEnabled = true
+        state.stations.rowFilter = { state.stationFilter.acceptsQrb(it.qrb) }
+
+        show(state, listOf(moving, stay), mapLookingAt("JO50JP", zoom = 12f))
+        onNodeWithText("Showing 2 visible stations | filtered view active").assertExists()
+
+        runOnIdle {
+            moving.qrb = 100.0
+            state.stations.forceRedraw()
+        }
+        waitForIdle()
+
+        onNodeWithText("Showing 1 visible stations | filtered view active").assertExists()
+    }
+
+    /**
+     * A selected station the filters hide has no marker, and so nothing to analyse: no
+     * request goes out and the analysis does not sit at "Loading" with an empty target (#21).
+     * The visible station beside it is the control: selecting it does ask and does load.
+     */
+    @Test
+    fun aSelectedStationTheFiltersHideGetsNoPathAnalysis() = runComposeUiTest {
+        val state = windowState(prefs(pathAnalysisVisible = true))
+        val hidden = station("DL1HIDE", 2, locator = "JO50JP").apply { qrb = 100.0 }
+        val shown = station("DL2SHOW", 2, locator = "JO62QM").apply { qrb = 800.0 }
+        state.stationFilter.minQrbKm = 300.0
+        state.stationFilter.minQrbEnabled = true
+        state.stations.rowFilter = { state.stationFilter.acceptsQrb(it.qrb) }
+        val analysis = RecordingPathAnalysis()
+        val mapState = mapLookingAt(ownLocator, zoom = 9f)
+        val home = Location(ownLocator)
+
+        show(state, listOf(hidden, shown), mapState, analysis)
+
+        runOnIdle { state.selectedStation.select(hidden) }
+        waitForIdle()
+
+        assertEquals(emptyList<ChatMember>(), analysis.requested, "a hidden station was analysed")
+        onAllNodesWithText("Loading", substring = true).assertCountEquals(0)
+        assertEquals(home.longitude.toDegrees(), mapState.centerLon, 1e-9, "the map panned to a hidden station")
+
+        runOnIdle { state.selectedStation.select(shown) }
+        waitForIdle()
+
+        assertEquals(listOf(shown), analysis.requested)
+        assertEquals(true, onAllNodesWithText("Loading", substring = true).fetchSemanticsNodes().isNotEmpty())
+    }
 }

github_docs/de-Benutzeroberflaeche.md

@@ -186,6 +186,7 @@ Die Filterleiste befindet sich oberhalb der Chatmember-Tabelle. Filter können m
 |---|---|
 | **Show only QTF** | Zeigt nur Stationen innerhalb der gewählten Antennenrichtung und des konfigurierten Öffnungswinkels |
 | **Show only QRB [km] <=** | Begrenzt die Liste auf die eingetragene maximale Entfernung |
+| **Show only QRB [km] >** | Blendet Stationen bis zur eingetragenen Mindestentfernung aus; zusammen mit dem Höchstwert ergibt sich ein Entfernungsbereich |
 | **Find** | Filtert nach einem vollständigen oder teilweisen Rufzeichen |
 | **wkd** | Blendet Basisrufzeichen aus, die bereits auf mindestens einem unterstützten Band gearbeitet wurden |
 | einzelne Band-Schaltflächen | Blenden Stationen aus, die auf dem betreffenden Band bereits gearbeitet oder dort als NOT QRV markiert wurden |

github_docs/de-Changelog.md

@@ -24,6 +24,8 @@ Mehrere Operateure an einem Rechner können jetzt eigene Rufzeichen, Locators un
 
 - **Profilwechsel im laufenden Betrieb:** **File → Switch operator profile...** trennt die Verbindung und baut die Oberfläche mit den Einstellungen des gewählten Profils neu auf, ohne Programmneustart.
 
+- **Filter für eine Mindestentfernung:** Neben **Show only QRB [km] <=** gibt es in der Filterleiste jetzt **Show only QRB [km] >** (deutsche Oberfläche: **Nur QRB [km] >**). Er blendet alle Stationen bis zur eingetragenen Entfernung aus. Sind beide eingeschaltet, zeigt die Liste einen Entfernungsbereich, etwa nur Stationen zwischen 300 und 800 km. Stationen ohne bekannte Entfernung werden ausgeblendet, solange einer der beiden Filter aktiv ist, und die Stationskarte folgt dem Filter. Wie beim Höchstwert gilt der Wert nur für die laufende Sitzung. Damit ist [Issue #21](https://github.com/praktimarc/kst4contest/issues/21) umgesetzt.
+
 - **Windows-Installer:** Neben dem portablen ZIP-Paket gibt es für Windows bei Stable-Releases jetzt einen MSI-Installer (`KST4Contest-v<Version>-windows-x64.msi`). Er installiert KST4Contest ohne Administratorrechte für das aktuelle Benutzerkonto, legt einen Startmenü-Eintrag und eine Desktop-Verknüpfung an und ersetzt bei einem Update die vorhandene Installation. Einstellungen und Datenbank bleiben unter `%USERPROFILE%\.praktiKST` und werden mit einer portablen Kopie geteilt. Damit ist die erste Stufe von [Issue #61](https://github.com/praktimarc/kst4contest/issues/61) umgesetzt.
 
 ### Geändert

github_docs/de-Funktionen.md

@@ -227,6 +227,8 @@ Sinnvoll: Während man CQ in eine bestimmte Richtung ruft, nur Stationen in dies
 
 Stationen jenseits einer maximalen Entfernung ausblenden. Schaltfläche **„Show only QRB [km] <="** ist ein Toggle-Button.
 
+**„Show only QRB [km] >"** wirkt umgekehrt: Er blendet alle Stationen bis zur eingetragenen Entfernung aus, sodass nur die weiter entfernten übrig bleiben. Eine Station genau in dieser Entfernung wird ebenfalls ausgeblendet. Sind beide eingeschaltet, zeigt die Liste einen Bereich: `Minimum < QRB <= Maximum`. Solange einer der beiden Filter aktiv ist, werden Stationen ohne bekannte Entfernung ausgeblendet. Beide Werte gelten nur für die laufende Sitzung.
+
 ---
 
 ## Filter für Worked-Status, neue Bänder und neue Großfelder

github_docs/en-Changelog.md

@@ -24,6 +24,8 @@ Several operators sharing one computer can now use their own callsigns, locators
 
 - **Switching profiles while running:** **File > Switch operator profile...** closes the connection and rebuilds the user interface with the settings of the selected profile, without restarting the program.
 
+- **Minimum distance filter:** next to **Show only QRB [km] <=** the station filter bar has **Show only QRB [km] >**, which hides every station up to the entered distance. With both switched on, the list shows a distance range, for example only stations between 300 and 800 km. Stations without a known distance are hidden while either filter is on, and the station map follows the filter. Like the maximum, the value only lasts for the running session. This implements [Issue #21](https://github.com/praktimarc/kst4contest/issues/21).
+
 - **Windows installer:** next to the portable ZIP package, stable releases now also ship an MSI installer for Windows (`KST4Contest-v<version>-windows-x64.msi`). It installs KST4Contest for the current user account without administrator rights, adds a Start menu entry and a desktop shortcut, and replaces the existing installation on an update. Settings and database stay under `%USERPROFILE%\.praktiKST` and are shared with a portable copy. This implements the first stage of [Issue #61](https://github.com/praktimarc/kst4contest/issues/61).
 
 ### Changed

github_docs/en-Features.md

@@ -226,6 +226,8 @@ Useful: While calling CQ in a specific direction, only show stations in that dir
 
 Hide stations beyond a maximum distance. The **"Show only QRB [km] <="** button is a toggle.
 
+**"Show only QRB [km] >"** works the other way round: it hides every station up to the entered distance, so only the far ones remain. A station exactly at that distance is hidden as well. With both switched on, the list shows a range: `minimum < QRB <= maximum`. While either filter is on, stations without a known distance are hidden. Both values only last for the running session.
+
 ---
 
 ## Filters for Worked Status, New Bands and New Grid Squares

github_docs/en-User-Interface.md

@@ -188,6 +188,7 @@ The filter bar is located above the chat-member table. Filters can be combined;
 |---|---|
 | **Show only QTF** | Shows only stations inside the selected antenna direction and configured beamwidth |
 | **Show only QRB [km] <=** | Limits the list to the entered maximum distance |
+| **Show only QRB [km] >** | Hides stations up to the entered minimum distance; together with the maximum it shows a distance range |
 | **Find** | Filters by a complete or partial callsign |
 | **wkd** | Hides base callsigns already worked on at least one supported band |
 | individual band buttons | Hide stations already worked on that band or marked NOT QRV there |

website/src/features/station-filters.md

@@ -36,6 +36,7 @@ KST4Contest therefore allows spatial, operating and propagation-related conditio
 
 - **Show only QTF** keeps stations inside the selected antenna direction and configured beamwidth.
 - **Show only QRB [km] <=** limits the list to the entered distance.
+- **Show only QRB [km] >** hides stations up to the entered distance; with both on, the list shows a distance range.
 
 ### Operating filters