feat: opt 进港查询 filter form

module_base/src/main/java/com/lukouguoji/module_base/ktx/EditTextKtx.kt

@@ -56,4 +56,43 @@ class UpperCaseAlphanumericInputFilter : InputFilter {
  */
 fun EditText.setUpperCaseAlphanumericFilter() {
     this.filters = arrayOf(UpperCaseAlphanumericInputFilter())
+}
+
+/**
+ * 大写字母输入过滤器
+ * 只允许输入大写字母(A-Z),小写字母自动转为大写
+ */
+class UpperCaseLetterInputFilter : InputFilter {
+    override fun filter(
+        source: CharSequence?,
+        start: Int,
+        end: Int,
+        dest: Spanned?,
+        dstart: Int,
+        dend: Int
+    ): CharSequence? {
+        if (source.isNullOrEmpty()) return null
+
+        val filtered = StringBuilder()
+        for (i in start until end) {
+            val char = source[i]
+            if (char in 'A'..'Z' || char in 'a'..'z') {
+                filtered.append(char.uppercaseChar())
+            }
+        }
+
+        return if (filtered.toString() == source.subSequence(start, end).toString()) {
+            null
+        } else {
+            filtered.toString()
+        }
+    }
+}
+
+/**
+ * 为 EditText 设置大写字母输入过滤器
+ * 使用方式: editText.setUpperCaseLetterFilter()
+ */
+fun EditText.setUpperCaseLetterFilter() {
+    this.filters = arrayOf(UpperCaseLetterInputFilter())
 }