v1.4.0: digit-only flaps with white euro text, nixie white euro + configurable flicker, mode-conditional config fields; fix stale derived-property reads in change handler

README.md

@@ -10,8 +10,8 @@ Three display styles, configurable in the settings dialog:
 | Style | Description |
 |---|---|
 | *Plain text* | Trend-colored text (green/red/grey) |
-| *Split-flap board* | Airport board: white characters on black flaps, cascading flip animation on price changes, trend LED |
+| *Split-flap board* | Airport board: white digit flaps, white € sign in the default font, cascading flip animation on price changes (configurable duration), trend LED |
-| *Nixie tubes* | Retro amber glowing digits in glass tubes (with a soft flicker), trend LED |
+| *Nixie tubes* | Retro amber glowing digits in glass tubes with configurable random flicker, white € sign in the default font, trend LED |
 
 In the split-flap and nixie styles the digits keep their display color and the
 trend (up/down/unchanged) is shown on a small LED next to the display.
@@ -35,7 +35,10 @@ representations.
   5 minutes. A hint text in the config dialog explains this.
 - **Split-flap cascade (seconds)** — default 3, range 1–15. Spreads the flip
   animation of a price change evenly over this many seconds (applies to the
-  split-flap display style).
+  split-flap display style). Only shown when that style is selected.
+- **Nixie flicker (0 = off)** — default 40, range 0–100. Random cathode-dropout
+  flicker of the nixie tubes; 0 disables it, higher values flicker more often
+  and deeper. Only shown when the nixie style is selected.
 
 Configurable via right-click on the widget → *Configure Bitcoin Price…* → *General*.
 

contents/config/main.xml

@@ -20,6 +20,12 @@
       <min>1</min>
       <max>15</max>
     </entry>
+    <entry name="nixieFlicker" type="Int">
+      <label>Nixie tube flicker intensity (0 = off, 100 = frequent and deep)</label>
+      <default>40</default>
+      <min>0</min>
+      <max>100</max>
+    </entry>
     <entry name="refreshMinutes" type="Int">
       <label>Refresh interval in minutes (minimum 5 because of the CoinGecko rate limit)</label>
       <default>5</default>

contents/ui/DisplayFlip.qml

@@ -1,7 +1,9 @@
 /*
  * Split-flap display mode — airport departure board style.
- * White characters on black cells with a flap split line;
+ * Only digits are shown as flaps; the euro sign is rendered as plain
- * changed characters flip with a cascading animation.
+ * text (default font, white) next to the board, and the trend shows
+ * on a small LED. Changed characters flip with a cascading animation
+ * spread over the configured number of seconds.
  * Pure QtQuick so it can be tested outside the plasmoid shell.
  */
 
@@ -18,6 +20,23 @@ Row {
 
     spacing: height * 0.06
 
+    function digitsOf(s) {
+        var out = "";
+        for (var i = 0; i < s.length; i++) {
+            var ch = s.charAt(i);
+            if ((ch >= "0" && ch <= "9") || ch === "-") {
+                out += ch;
+            }
+        }
+        return out;
+    }
+
+    // UI-only derived values (euro visibility); logic must not rely on these —
+    // QML gives no ordering guarantee between a change handler and the
+    // re-evaluation of dependent bindings.
+    readonly property string digitsOnly: digitsOf(display)
+    readonly property string boardText: digitsOnly.length > 0 ? digitsOnly : "--"
+
     property var chars: []
     property bool ready: false
     readonly property real cellFont: height * 0.72
@@ -26,7 +45,7 @@ Row {
     readonly property int flapDuration: 260
 
     Component.onCompleted: {
-        chars = display.split("");
+        chars = boardText.split("");
         ready = true;
     }
 
@@ -34,7 +53,10 @@ Row {
         if (!ready) {
             return;
         }
-        var nc = display.split("");
+        // compute from display directly: derived bindings may still be
+        // stale at this point (QML makes no ordering guarantee)
+        var digits = digitsOf(display);
+        var nc = (digits.length > 0 ? digits : "--").split("");
         var n = Math.max(chars.length, nc.length);
         // spread the changed cells evenly across flapSeconds
         var changed = [];
@@ -141,8 +163,17 @@ Row {
         }
     }
 
-    // trend LED (green/red/grey) — boards are monochrome, so the
+    // euro sign in the plain-text font, white
-    // trend shows here instead of in the letter color
+    Text {
+        anchors.verticalCenter: parent.verticalCenter
+        text: "\u20AC"
+        visible: root.digitsOnly.length > 0
+        color: "#ffffff"
+        font.family: Qt.application.font.family
+        font.pixelSize: root.height * 0.66
+    }
+
+    // trend LED (green/red/grey)
     Rectangle {
         width: root.height * 0.14
         height: width

contents/ui/DisplayNixie.qml

@@ -1,7 +1,10 @@
 /*
  * Nixie tube display mode — retro amber glowing digits in glass tubes.
  * Glow is faked with layered text copies, so no QtGraphicalEffects
- * dependency. Pure QtQuick: testable outside the plasmoid shell.
+ * dependency. Tubes flicker randomly (nixie cathode style); the
+ * flicker intensity is configurable (0 = off, 100 = nervous).
+ * The euro sign is rendered as plain text (default font, white).
+ * Pure QtQuick: testable outside the plasmoid shell.
  */
 
 import QtQuick 2.15
@@ -12,12 +15,26 @@ Row {
     // wired by the parent loader
     property string display: "--"
     property color trendColor: "#9e9e9e"
+    // 0 = no flicker, 100 = frequent and deep flicker
+    property int flickerIntensity: 40
 
     spacing: height * 0.05
 
-    readonly property string digits: display.replace(/[^0-9]/g, "")
+    function digitsOf(s) {
+        var out = "";
+        for (var i = 0; i < s.length; i++) {
+            var ch = s.charAt(i);
+            if (ch >= "0" && ch <= "9") {
+                out += ch;
+            }
+        }
+        return out;
+    }
+
+    readonly property string digits: digitsOf(display)
     readonly property real tubeWidth: height * 0.52
     readonly property real glowFont: height * 0.80
+    readonly property bool flickerOn: flickerIntensity > 0 && digits.length > 0
 
     Repeater {
         model: root.digits.length
@@ -48,6 +65,11 @@ Row {
                 opacity: 0.06
             }
 
+            // digit + glow layers, flickered as one group
+            Item {
+                id: glowGroup
+                anchors.fill: parent
+
                 Text {
                     id: glowText
                     anchors.centerIn: parent
@@ -73,46 +95,56 @@ Row {
                         font: parent.font
                         scale: 1.10
                     }
+                }
+            }
 
-                // occasional gentle nixie flicker
+            // nixie flicker: random dropout of the cathode glow
             Timer {
-                    interval: 2200 + Math.random() * 3200
+                id: flickTimer
                 repeat: false
-                    running: root.visible && root.digits.length > 0
+                running: root.flickerOn
                 onTriggered: {
-                        flick.stop();
+                    flick.restart();
-                        flick.start();
+                    scheduleNext();
-                        interval = 2200 + Math.random() * 3200;
-                        restart();
                 }
+
+                function scheduleNext() {
+                    // intensity 40 -> ~4 s between flicks, 100 -> ~1.5 s
+                    var base = 6000 - root.flickerIntensity * 45;
+                    interval = Math.max(700, base * (0.6 + Math.random() * 0.8));
                 }
+
+                Component.onCompleted: scheduleNext()
+            }
+
             SequentialAnimation {
                 id: flick
-                    NumberAnimation {
+                ScriptAction {
-                        target: glowText
+                    script: {
-                        property: "opacity"
+                        var range = root.flickerIntensity / 100 * 0.75;
-                        to: 0.82
+                        glowGroup.opacity = 1 - (0.15 + Math.random() * range);
-                        duration: 70
                     }
+                }
+                PauseAnimation { duration: 40 + Math.random() * 140 }
                 NumberAnimation {
-                        target: glowText
+                    target: glowGroup
                     property: "opacity"
                     to: 1.0
-                        duration: 140
+                    duration: 90 + Math.random() * 160
-                    }
+                    easing.type: Easing.OutQuad
                 }
             }
         }
     }
 
-    // currency indicator, dim amber like an indicator lamp
+    // euro sign in the plain-text font, white
     Text {
         anchors.verticalCenter: parent.verticalCenter
         text: "\u20AC"
-        color: "#8a5a20"
-        font.family: "DejaVu Serif"
-        font.pixelSize: root.glowFont * 0.6
         visible: root.digits.length > 0
+        color: "#ffffff"
+        font.family: Qt.application.font.family
+        font.pixelSize: root.height * 0.60
     }
 
     // error / empty state

contents/ui/configGeneral.qml

@@ -2,6 +2,7 @@
  * Config page for nl.a14r.bitcoinprice.
  * Follows the canonical Plasma 5 config dialog pattern:
  * Kirigami.FormLayout + cfg_ prefixed property aliases.
+ * Mode-specific settings are only visible for the matching style.
  */
 
 import QtQuick 2.15
@@ -15,6 +16,7 @@ Kirigami.FormLayout {
     property alias cfg_displayMode: modeCombo.currentIndex
     property alias cfg_refreshMinutes: intervalSpin.value
     property alias cfg_flapSeconds: flapSpin.value
+    property alias cfg_nixieFlicker: flickSpin.value
 
     Item {
         Kirigami.FormData.isSection: true
@@ -28,6 +30,7 @@ Kirigami.FormLayout {
 
     QQC2.SpinBox {
         id: flapSpin
+        visible: modeCombo.currentIndex === 1
         Kirigami.FormData.label: i18n("Split-flap cascade (seconds):")
         from: 1
         to: 15
@@ -35,6 +38,16 @@ Kirigami.FormLayout {
         editable: true
     }
 
+    QQC2.SpinBox {
+        id: flickSpin
+        visible: modeCombo.currentIndex === 2
+        Kirigami.FormData.label: i18n("Nixie flicker (0 = off):")
+        from: 0
+        to: 100
+        stepSize: 10
+        editable: true
+    }
+
     QQC2.SpinBox {
         id: intervalSpin
         Kirigami.FormData.label: i18n("Refresh interval (minutes):")

contents/ui/main.qml

@@ -28,6 +28,9 @@ Item {
     // Seconds over which the split-flap display cascades to a new price
     readonly property int flapSeconds: Math.max(1, plasmoid.configuration.flapSeconds)
 
+    // Nixie tube flicker intensity (0 = off, 100 = frequent and deep)
+    readonly property int nixieFlicker: Math.max(0, Math.min(100, plasmoid.configuration.nixieFlicker))
+
     // 0 = plain text, 1 = split-flap board, 2 = nixie tubes
     property int displayMode: 0
     readonly property string modeSource: displayMode === 1 ? "DisplayFlip.qml"
@@ -143,6 +146,9 @@ Item {
                         if (item.flapSeconds !== undefined) {
                             item.flapSeconds = Qt.binding(function () { return root.flapSeconds; });
                         }
+                        if (item.flickerIntensity !== undefined) {
+                            item.flickerIntensity = Qt.binding(function () { return root.nixieFlicker; });
+                        }
                     }
                 }
             }
@@ -181,6 +187,9 @@ Item {
                         if (item.flapSeconds !== undefined) {
                             item.flapSeconds = Qt.binding(function () { return root.flapSeconds; });
                         }
+                        if (item.flickerIntensity !== undefined) {
+                            item.flickerIntensity = Qt.binding(function () { return root.nixieFlicker; });
+                        }
                     }
                 }
 

metadata.desktop

@@ -10,7 +10,7 @@ X-KDE-ServiceTypes=Plasma/Applet
 X-KDE-PluginInfo-Author=Arnold Cordewiner
 X-KDE-PluginInfo-Email=hermes@a14r.be
 X-KDE-PluginInfo-Name=nl.a14r.bitcoinprice
-X-KDE-PluginInfo-Version=1.3.0
+X-KDE-PluginInfo-Version=1.4.0
 X-KDE-PluginInfo-Website=https://gitea.a14r.be/hermes/plasma-bitcoin-price
 X-KDE-PluginInfo-Category=Utilities
 X-KDE-PluginInfo-License=MIT