优化混炼示方

jeecgboot-vue3/src/views/xslmes/mesXslMixingSpec/components/MesXslMixingStepSelectCell.vue

@@ -10,6 +10,7 @@
     size="small"
     class="mixing-step-select"
     popup-class-name="mixing-step-select-dropdown"
+    :list-height="listHeight"
     :placeholder="placeholder"
     :get-popup-container="getPopupContainer"
     @update:value="handleChange"
@@ -19,9 +20,14 @@
 </template>
 
 <script lang="ts" setup>
-  import { ref } from 'vue';
+  import { computed, ref } from 'vue';
   import { useMessage } from '/@/hooks/web/useMessage';
 
+  /** 下拉单项高度（与 ant-design-vue small Select 选项行高一致） */
+  const STEP_SELECT_ITEM_HEIGHT = 32;
+  /** 下拉最多可见条数 */
+  const STEP_SELECT_MAX_VISIBLE = 20;
+
   const props = defineProps<{
     row: Recordable;
     field: string;
@@ -34,6 +40,14 @@
   const { createMessage } = useMessage();
   const dropdownOpen = ref(false);
 
+  //update-begin---author:cursor ---date:20260525  for：【XSLMES-20260525-A57】混合步骤动作/组合下拉最多展示20条-----------
+  const listHeight = computed(() => {
+    const count = props.options?.length ?? 0;
+    const visibleCount = count > 0 ? Math.min(count, STEP_SELECT_MAX_VISIBLE) : STEP_SELECT_MAX_VISIBLE;
+    return visibleCount * STEP_SELECT_ITEM_HEIGHT;
+  });
+  //update-end---author:cursor ---date:20260525  for：【XSLMES-20260525-A57】混合步骤动作/组合下拉最多展示20条-----------
+
   function handleChange(value: string | undefined) {
     props.row[props.field] = value;
   }