add NewValueListener and OldValueListener

src/main/java/com/imyeyu/fx/listener/NewValueListener.java

@@ -0,0 +1,18 @@
+package com.imyeyu.fx.listener;
+
+import javafx.beans.value.ChangeListener;
+import javafx.beans.value.ObservableValue;
+
+/**
+ * @author 夜雨
+ * @since 2025-07-21 23:22
+ */
+public interface NewValueListener<T> extends ChangeListener<T> {
+
+	void newValue(T newValue);
+
+	@Override
+	default void changed(ObservableValue<? extends T> observable, T oldValue, T newValue) {
+		this.newValue(newValue);
+	}
+}

src/main/java/com/imyeyu/fx/listener/OldValueListener.java

@@ -0,0 +1,17 @@
+package com.imyeyu.fx.listener;
+
+import javafx.beans.value.ChangeListener;
+
+/**
+ * @author 夜雨
+ * @since 2025-07-21 23:41
+ */
+public interface OldValueListener<T> extends ChangeListener<T> {
+
+	void oldValue(T oldValue);
+
+	@Override
+	default void changed(javafx.beans.value.ObservableValue<? extends T> observable, T oldValue, T newValue) {
+		this.oldValue(oldValue);
+	}
+}