feat: swing the pill's padlock open when it unlocks

src/agent/qml/Bubble.qml

@@ -231,6 +231,7 @@ Item {
                 anchors.verticalCenter: parent.verticalCenter
                 x: 16
                 open: root.shownPhase === "success"
+                pace: root.pace
                 color: root.shownPhase === "failure" || root.shownPhase === "lockout" ? Theme.failure : Theme.textPrimary
             }
 

src/agent/qml/FaceGlyph.qml

@@ -411,6 +411,7 @@ Item {
             anchors.centerIn: parent
             width: parent.width * 0.42
             height: width
+            pace: root.pace
             color: root.color
             opacity: root.mode === "lockout" ? 1 : 0
             scale: root.mode === "lockout" ? 1 : 0.7

src/agent/qml/LockGlyph.qml

@@ -1,6 +1,8 @@
 // SPDX-License-Identifier: GPL-3.0-or-later
 //
-// A padlock whose shackle lifts and swings open.
+// A padlock that opens the way a real one does: the shackle jumps up, its
+// left leg coming out of the body, and swings round its right leg to the
+// other side.
 
 import QtQuick
 import QtQuick.Shapes
@@ -10,9 +12,64 @@ Item {
 
     property color color: Theme.textPrimary
     property bool open: false
+    property real pace: 1
 
     readonly property real u: width / 100
 
+    // 0 shut, 1 open. Everything below follows from it. Only opening is
+    // animated: it is shut again for the next scan, and the screen was
+    // locked all along, so showing it lock would make no sense.
+    property real openness: 0
+    onOpenChanged: {
+        if (open) {
+            opening.restart()
+        } else {
+            opening.stop()
+            openness = 0
+        }
+    }
+    NumberAnimation {
+        id: opening
+        target: root
+        property: "openness"
+        to: 1
+        duration: 560 * root.pace
+    }
+
+    function smooth(from, to, p) {
+        const x = Math.max(0, Math.min(1, (p - from) / (to - from)))
+        return x * x * (3 - 2 * x)
+    }
+    // Up first, then round, a little past the other side and back.
+    readonly property real lift: 12 * smooth(0, 0.3, openness)
+    readonly property real swing: {
+        const p = Math.max(0, Math.min(1, (openness - 0.22) / 0.78))
+        const s = 1.4
+        return 180 * (1 + (s + 1) * Math.pow(p - 1, 3) + s * Math.pow(p - 1, 2))
+    }
+    // A small beat as it comes open.
+    scale: 1 + 0.14 * Math.sin(Math.PI * smooth(0.55, 1, openness))
+
+    // The shackle as points: up the left leg, over the top, down the right
+    // leg, which stays in the body. Swung about that leg, everything else
+    // narrows towards it and comes out on the other side.
+    function shackle() {
+        const right = 68.5, radius = 18.5
+        const top = 28 - lift
+        const narrow = Math.cos(swing * Math.PI / 180)
+        const points = []
+        const add = (x, y) => points.push(Qt.point((right + (x - right) * narrow) * u, y * u))
+        add(31.5, 56 - 18 * smooth(0, 0.3, openness))
+        add(31.5, top)
+        for (let i = 1; i < 24; ++i) {
+            const a = Math.PI + Math.PI * i / 24
+            add(50 + radius * Math.cos(a), top + radius * Math.sin(a))
+        }
+        add(right, top)
+        add(right, 56)
+        return points
+    }
+
     // Body
     Rectangle {
         x: 14 * root.u
@@ -23,41 +80,17 @@ Item {
         color: root.color
     }
 
-    // Shackle: a U standing on the body. Opening lifts it and swings it about
-    // its right leg.
-    Item {
-        id: shackle
-        x: 26 * root.u
-        y: 4 * root.u
-        width: 48 * root.u
-        height: 52 * root.u
-        transformOrigin: Item.BottomRight
+    Shape {
+        anchors.fill: parent
+        preferredRendererType: Shape.CurveRenderer
 
-        property real lift: root.open ? 7 * root.u : 0
-        Behavior on lift { NumberAnimation { duration: 260; easing.type: Easing.OutBack } }
-        rotation: root.open ? -28 : 0
-        Behavior on rotation { NumberAnimation { duration: 320; easing.type: Easing.OutBack } }
-        transform: Translate { y: -shackle.lift }
-
-        Shape {
-            anchors.fill: parent
-            preferredRendererType: Shape.CurveRenderer
-            ShapePath {
-                strokeColor: root.color
-                strokeWidth: 11 * root.u
-                fillColor: "transparent"
-                capStyle: ShapePath.FlatCap
-                startX: 5.5 * root.u
-                startY: shackle.height
-                PathLine { x: 5.5 * root.u; y: 24 * root.u }
-                PathArc {
-                    x: shackle.width - 5.5 * root.u
-                    y: 24 * root.u
-                    radiusX: (shackle.width - 11 * root.u) / 2
-                    radiusY: radiusX
-                }
-                PathLine { x: shackle.width - 5.5 * root.u; y: shackle.height }
-            }
+        ShapePath {
+            strokeColor: root.color
+            strokeWidth: 11 * root.u
+            fillColor: "transparent"
+            capStyle: ShapePath.RoundCap
+            joinStyle: ShapePath.RoundJoin
+            PathPolyline { path: root.shackle() }
         }
     }
 }