Drag Select Special Option for Asset Picker

example/lib/constants/picker_method.dart

@@ -329,6 +329,24 @@ class PickMethod {
     );
   }
 
+  factory PickMethod.dragSelect(BuildContext context, int maxAssetsCount) {
+    return PickMethod(
+      icon: '📲',
+      name: context.l10n.pickMethodDragSelectName,
+      description: context.l10n.pickMethodDragSelectDescription,
+      method: (BuildContext context, List<AssetEntity> assets) {
+        return AssetPicker.pickAssets(
+          context,
+          pickerConfig: AssetPickerConfig(
+            maxAssets: maxAssetsCount,
+            selectedAssets: assets,
+            specialPickerType: SpecialPickerType.dragSelect,
+          ),
+        );
+      },
+    );
+  }
+
   factory PickMethod.keepScrollOffset({
     required BuildContext context,
     required DefaultAssetPickerBuilderDelegate Function() delegate,

example/lib/l10n/app_en.arb

@@ -30,6 +30,8 @@
   "pickMethodPrependItemDescription": "A special item will prepend to the assets grid.",
   "pickMethodNoPreviewName": "No preview",
   "pickMethodNoPreviewDescription": "You cannot preview assets during the picking, the behavior is like the WhatsApp/MegaTok pattern.",
+  "pickMethodDragSelectName": "Drag Select",
+  "pickMethodDragSelectDescription": "You can drag and select assets in this mode.",
   "pickMethodKeepScrollOffsetName": "Keep scroll offset",
   "pickMethodKeepScrollOffsetDescription": "Pick assets from same scroll position.",
   "pickMethodChangeLanguagesName": "Change Languages",

example/lib/l10n/app_zh.arb

@@ -30,6 +30,8 @@
   "pickMethodPrependItemDescription": "网格的靠前位置会添加一个自定义的 widget。",
   "pickMethodNoPreviewName": "禁止预览",
   "pickMethodNoPreviewDescription": "无法预览选择的资源，与 WhatsApp/MegaTok 的行为类似。",
+  "pickMethodDragSelectName": "拖动选择",
+  "pickMethodDragSelectDescription": "您可以在此模式下拖动并选择资源。",
   "pickMethodKeepScrollOffsetName": "保持滚动位置",
   "pickMethodKeepScrollOffsetDescription": "可以从上次滚动到的位置再次开始选择。",
   "pickMethodChangeLanguagesName": "更改语言",

example/lib/l10n/gen/app_localizations.dart

@@ -8,6 +8,8 @@ import 'package:intl/intl.dart' as intl;
 import 'app_localizations_en.dart';
 import 'app_localizations_zh.dart';
 
+// ignore_for_file: type=lint
+
 /// Callers can lookup localized strings with an instance of AppLocalizations
 /// returned by `AppLocalizations.of(context)`.
 ///
@@ -276,6 +278,18 @@ abstract class AppLocalizations {
   /// **'You cannot preview assets during the picking, the behavior is like the WhatsApp/MegaTok pattern.'**
   String get pickMethodNoPreviewDescription;
 
+  /// No description provided for @pickMethodDragSelectName.
+  ///
+  /// In en, this message translates to:
+  /// **'Drag Select'**
+  String get pickMethodDragSelectName;
+
+  /// No description provided for @pickMethodDragSelectDescription.
+  ///
+  /// In en, this message translates to:
+  /// **'You can drag and select assets in this mode.'**
+  String get pickMethodDragSelectDescription;
+
   /// No description provided for @pickMethodKeepScrollOffsetName.
   ///
   /// In en, this message translates to:

example/lib/l10n/gen/app_localizations_en.dart

@@ -1,5 +1,7 @@
 import 'app_localizations.dart';
 
+// ignore_for_file: type=lint
+
 /// The translations for English (`en`).
 class AppLocalizationsEn extends AppLocalizations {
   AppLocalizationsEn([String locale = 'en']) : super(locale);
@@ -106,6 +108,13 @@ class AppLocalizationsEn extends AppLocalizations {
   String get pickMethodNoPreviewDescription =>
       'You cannot preview assets during the picking, the behavior is like the WhatsApp/MegaTok pattern.';
 
+  @override
+  String get pickMethodDragSelectName => 'Drag Select';
+
+  @override
+  String get pickMethodDragSelectDescription =>
+      'You can drag and select assets in this mode.';
+
   @override
   String get pickMethodKeepScrollOffsetName => 'Keep scroll offset';
 

example/lib/l10n/gen/app_localizations_zh.dart

@@ -1,5 +1,7 @@
 import 'app_localizations.dart';
 
+// ignore_for_file: type=lint
+
 /// The translations for Chinese (`zh`).
 class AppLocalizationsZh extends AppLocalizations {
   AppLocalizationsZh([String locale = 'zh']) : super(locale);
@@ -100,6 +102,12 @@ class AppLocalizationsZh extends AppLocalizations {
   String get pickMethodNoPreviewDescription =>
       '无法预览选择的资源，与 WhatsApp/MegaTok 的行为类似。';
 
+  @override
+  String get pickMethodDragSelectName => '拖动选择';
+
+  @override
+  String get pickMethodDragSelectDescription => '您可以在此模式下拖动并选择资源。';
+
   @override
   String get pickMethodKeepScrollOffsetName => '保持滚动位置';
 

example/lib/pages/multi_assets_page.dart

@@ -61,6 +61,7 @@ class _MultiAssetsPageState extends State<MultiAssetsPage>
         },
       ),
       PickMethod.noPreview(context, maxAssetsCount),
+      PickMethod.dragSelect(context, maxAssetsCount),
       PickMethod.customizableTheme(context, maxAssetsCount),
       PickMethod.pathNameBuilder(context, maxAssetsCount),
       PickMethod.customFilterOptions(context, maxAssetsCount),

lib/src/constants/config.dart

@@ -119,12 +119,16 @@ class AssetPickerConfig {
   ///   no more images can be selected.
   /// * [SpecialPickerType.noPreview] Disable preview of asset;
   ///   Clicking on an asset selects it.
+  /// * [SpecialPickerType.dragSelect] User able to drag
+  ///   and select assets.
   ///
   /// 这里包含一些特殊选择类型：
   /// * [SpecialPickerType.wechatMoment] 微信朋友圈模式。
   ///   当用户选择了视频，将不能选择图片。
   /// * [SpecialPickerType.noPreview] 禁用资源预览。
   ///   多选时单击资产将直接选中，单选时选中并返回。
+  /// * [SpecialPickerType.dragSelect] 用户可以拖动
+  /// 并选择资产。
   final SpecialPickerType? specialPickerType;
 
   /// Whether the picker should save the scroll offset between pushes and pops.

lib/src/constants/enums.dart

@@ -25,6 +25,15 @@ enum SpecialPickerType {
   /// 在多选模式下无论点击选择指示还是 item 都将触发选择，
   /// 而在单选模式下将直接返回点击的资源。
   noPreview,
+
+  /// Drag and Select.
+  /// 禁用资源预览
+  ///
+  /// The user can drag and select items. Must be in multiple select mode.
+  /// Triggers all the settings of preview mode plus drag and select.
+  /// 用户可以拖动并选择项目。必须处于多选模式
+  /// 触发预览模式的所有设置以及拖动和选择。
+  dragSelect,
 }
 
 /// Provide an item slot for custom widget insertion.