Added AddFreeTimeBeatEvent and PulseFreeTimeBeatEvent.

core/src/commonMain/kotlin/cn/rdlevel/rdkt/core/events/AddFreeTimeBeatEvent.kt

@@ -0,0 +1,40 @@
+package cn.rdlevel.rdkt.core.events
+
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+
+/**
+ * Adds a freetime beat to the row.
+ */
+@Serializable
+@SerialName("AddFreeTimeBeat")
+public class AddFreeTimeBeatEvent() : RowEvent() {
+    /**
+     * The start pulse of the freetime beat. It must be between 0 and 6, where 0 is the first pulse.
+     */
+    public var pulse: Int = 0
+        set(value) {
+            require(value in 0..6) { "Pulse must be between 0 and 6, but found: $value." }
+            field = value
+        }
+
+    /**
+     * The hold time this pulse will last in beats. 0 means disable the hold.
+     */
+    public var hold: Double = 0.0
+
+    public constructor(
+        pulse: Int,
+        hold: Double,
+    ) : this() {
+        this.pulse = pulse
+        this.hold = hold
+    }
+
+    public constructor(
+        pulse: Int,
+    ) : this() {
+        this.pulse = pulse
+    }
+}

core/src/commonMain/kotlin/cn/rdlevel/rdkt/core/events/PulseFreeTimeBeatEvent.kt

@@ -0,0 +1,90 @@
+@file:OptIn(RDKTInternalAPI::class)
+
+package cn.rdlevel.rdkt.core.events
+
+
+import cn.rdlevel.rdkt.core.annotations.RDKTInternalAPI
+import cn.rdlevel.rdkt.core.serialization.TransformSerializer
+import kotlinx.serialization.Serializable
+import kotlin.jvm.JvmOverloads
+
+/**
+ * Advance or modify existing freetime beat on the specified row.
+ *
+ * @property action The action to perform on the freetime beat.
+ * @property hold The hold time this pulse will last in beats. 0 means disable the hold.
+ */
+@Serializable(PulseFreeTimeBeatEvent.Serializer::class)
+public data class PulseFreeTimeBeatEvent @JvmOverloads constructor(
+    var action: Action = Action.Increment,
+    var hold: Int = 0,
+) : RowEvent() {
+    /**
+     * Represents the action to perform on the freetime beat.
+     */
+    public sealed class Action(public val action: String) {
+        /**
+         * Advance the pulse of the freetime beat by 1.
+         */
+        public object Increment : Action("Increment")
+
+        /**
+         * Retreat the pulse of the freetime beat by 1.
+         */
+        public object Decrement : Action("Decrement")
+
+        /**
+         * Set the pulse of the freetime beat to a specific value.
+         *
+         * @property pulse The pulse to set the freetime beat to. It must be between 0 and 6, where 0 is the first pulse.
+         */
+        public class Custom(pulse: Int) : Action("Custom") {
+            public var pulse: Int = pulse
+                set(value) {
+                    require(value in 0..6) { "Pulse must be between 0 and 6, but found: $value." }
+                    field = value
+                }
+
+            init {
+                this.pulse = pulse
+            }
+        }
+
+        /**
+         * Remove the freetime beat.
+         */
+        public object Remove : Action("Remove")
+    }
+
+    public object Serializer : TransformSerializer<PulseFreeTimeBeatEvent, Serializer.Data>(Data.serializer()) {
+        override fun toData(value: PulseFreeTimeBeatEvent): Data {
+            return Data(
+                action = value.action.action,
+                hold = value.hold,
+                customPulse = (value.action as? Action.Custom)?.pulse,
+            )
+        }
+
+        override fun fromData(data: Data): PulseFreeTimeBeatEvent {
+            val action = when (data.action) {
+                "Increment" -> Action.Increment
+                "Decrement" -> Action.Decrement
+                "Custom" -> Action.Custom(data.customPulse ?: error("Custom action requires customPulse value."))
+                "Remove" -> Action.Remove
+                else -> throw IllegalArgumentException("Unknown action: ${data.action}")
+            }
+            return PulseFreeTimeBeatEvent(
+                action = action,
+                hold = data.hold,
+            )
+        }
+
+        @RDKTInternalAPI
+        @Serializable
+        public data class Data(
+            var action: String = "Increment",
+            var hold: Int = 0,
+            var customPulse: Int? = null,
+        )
+    }
+}