14.8 过滤面板 - 品牌、性别、新旧

14.8 过滤面板 - 品牌、性别、新旧

img

实现步骤：

第 1 步：定义常量

lib/common/values/constants.dart

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// 品牌
static const storageProductsAttributesBrand = 'products_attributes_brand';
// 性别
static const storageProductsAttributesGender = 'products_attributes_gender';
// 新旧
static const storageProductsAttributesCondition =
    'products_attributes_condition';

第 2 步：缓存数据

lib/pages/goods/home/controller.dart

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_initData() async {
  ...

// 品牌
  var attributeBrand = await ProductApi.attributes(3);
  // 性别
  var attributeGender = await ProductApi.attributes(4);
  // 新旧
  var attributeCondition = await ProductApi.attributes(5);

  // 保存离线数据
  Storage().setString(
      Constants.storageProductsAttributesBrand, jsonEncode(attributeBrand));
  Storage().setString(
      Constants.storageProductsAttributesGender, jsonEncode(attributeGender));
  Storage().setString(Constants.storageProductsAttributesCondition,
      jsonEncode(attributeCondition));

  ...

第 3 步：控制器

lib/pages/search/search_filter/controller.dart

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// Brand
List<KeyValueModel<AttributeModel>> brands = [];
List<String> brandKeys = [];

// Gender
List<KeyValueModel<AttributeModel>> genders = [];
List<String> genderKeys = [];

// Condition
List<KeyValueModel<AttributeModel>> conditions = [];
List<String> conditionKeys = [];
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// 读取缓存
void _loadCache() async {
  ...

  // 品牌列表
  {
    String result =
        Storage().getString(Constants.storageProductsAttributesBrand);
    brands = jsonDecode(result).map<KeyValueModel<AttributeModel>>((item) {
      var arrt = AttributeModel.fromJson(item);
      return KeyValueModel(key: "${arrt.name}", value: arrt);
    }).toList();
  }

  // 性别列表
  {
    String result =
        Storage().getString(Constants.storageProductsAttributesGender);
    genders = jsonDecode(result).map<KeyValueModel<AttributeModel>>((item) {
      var arrt = AttributeModel.fromJson(item);
      return KeyValueModel(key: "${arrt.name}", value: arrt);
    }).toList();
  }

  // 新旧列表
  {
    String result =
        Storage().getString(Constants.storageProductsAttributesCondition);
    conditions =
        jsonDecode(result).map<KeyValueModel<AttributeModel>>((item) {
      var arrt = AttributeModel.fromJson(item);
      return KeyValueModel(key: "${arrt.name}", value: arrt);
    }).toList();
  }
}
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// 品牌选中
void onBrandTap(List<String> keys) {
  brandKeys = keys;
  update(["filter_brands"]);
}

// 性别选中
void onGenderTap(List<String> keys) {
  genderKeys = keys;
  update(["filter_genders"]);
}

// 新旧选中
void onConditionTap(List<String> keys) {
  conditionKeys = keys;
  update(["filter_conditions"]);
}

第 4 步：FilterView 视图

lib/pages/search/search_filter/widgets/filter_view.dart

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// 品牌选择
  Widget _buildBrands() {
    return GetBuilder<SearchFilterController>(
      id: "filter_brands",
      builder: ( _) {
        return TagsListWidget(
          onTap: controller.onBrandTap,
          itemList: controller.brands,
          keys: controller.brandKeys,
          bgSelectedColor: AppColors.highlight,
          textSelectedColor: AppColors.onPrimary,
          borderRadius: 11,
          height: 17,
          width: 55,
          textSize: 9,
          textWeight: FontWeight.w400,
        ).paddingBottom(AppSpace.listRow * 2);
      },
    );
  }

  // 性别选择
  Widget _buildGenders() {
    return GetBuilder<SearchFilterController>(
      id: "filter_genders",
      builder: ( _) {
        return TagsListWidget(
          onTap: controller.onGenderTap,
          itemList: controller.genders,
          keys: controller.genderKeys,
          bgSelectedColor: AppColors.highlight,
          textSelectedColor: AppColors.onPrimary,
          borderRadius: 11,
          height: 17,
          width: 55,
          textSize: 9,
          textWeight: FontWeight.w400,
        ).paddingBottom(AppSpace.listRow * 2);
      },
    );
  }

  // 新旧选择
  Widget _buildConditions() {
    return GetBuilder<SearchFilterController>(
      id: "filter_conditions",
      builder: ( _) {
        return TagsListWidget(
          onTap: controller.onConditionTap,
          itemList: controller.conditions,
          keys: controller.conditionKeys,
          bgSelectedColor: AppColors.highlight,
          textSelectedColor: AppColors.onPrimary,
          borderRadius: 11,
          height: 17,
          width: 55,
          textSize: 9,
          textWeight: FontWeight.w400,
        ).paddingBottom(AppSpace.listRow * 2);
      },
    );
  }
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Widget _buildView() {
  return <Widget>[
    ...

    // 品牌
    _buildTitle(LocaleKeys.searchFilterBrand.tr),
    _buildBrands(),

    // 性别
    _buildTitle(LocaleKeys.searchFilterGender.tr),
    _buildGenders(),

    // 新旧
    _buildTitle(LocaleKeys.searchFilterCondition.tr),
    _buildConditions(),

提交代码到 git