✨ Add camera picker text delegate.

Author: AlexV525

lib/src/constants/constants.dart

@@ -2,6 +2,17 @@
 /// [Author] Alex (https://github.com/AlexV525)
 /// [Date] 2020/7/15 02:06
 ///
+import 'package:wechat_camera_picker/wechat_camera_picker.dart';
+
 export 'package:flutter_common_exports/flutter_common_exports.dart';
+export 'package:photo_manager/photo_manager.dart';
 
+export '../delegates/camera_picker_text_delegate.dart';
 export 'colors.dart';
+
+class Constants {
+  const Constants._();
+
+  static CameraPickerTextDelegate textDelegate =
+      DefaultCameraPickerTextDelegate();
+}

lib/src/delegates/camera_picker_text_delegate.dart

@@ -0,0 +1,68 @@
+///
+/// [Author] Alex (https://github.com/AlexV525)
+/// [Date] 2020/7/16 11:07
+///
+
+/// Text delegate that controls text in widgets.
+/// 控制部件中的文字实现
+abstract class CameraPickerTextDelegate {
+  /// Confirm string for the confirm button.
+  /// 确认按钮的字段
+  String confirm;
+
+  /// Tips string above the shooting button before shooting.
+  /// 拍摄前确认按钮上方的提示文字
+  String shootingTips;
+}
+
+/// Default text delegate implements with Chinese.
+/// 中文文字实现
+class DefaultCameraPickerTextDelegate implements CameraPickerTextDelegate {
+  factory DefaultCameraPickerTextDelegate() => _instance;
+
+  DefaultCameraPickerTextDelegate._internal();
+
+  static final DefaultCameraPickerTextDelegate _instance =
+      DefaultCameraPickerTextDelegate._internal();
+
+  @override
+  String confirm = '确认';
+
+  @override
+  String shootingTips = '轻触拍照';
+}
+
+/// Default text delegate implements with Chinese.
+/// 中文文字实现
+class DefaultCameraPickerTextDelegateWithRecording
+    implements CameraPickerTextDelegate {
+  factory DefaultCameraPickerTextDelegateWithRecording() => _instance;
+
+  DefaultCameraPickerTextDelegateWithRecording._internal();
+
+  static final DefaultCameraPickerTextDelegateWithRecording _instance =
+      DefaultCameraPickerTextDelegateWithRecording._internal();
+
+  @override
+  String confirm = '确认';
+
+  @override
+  String shootingTips = '轻触拍照，长按摄像';
+}
+
+/// Default text delegate implements with English.
+/// 英文文字实现
+class EnglishCameraPickerTextDelegate implements CameraPickerTextDelegate {
+  factory EnglishCameraPickerTextDelegate() => _instance;
+
+  EnglishCameraPickerTextDelegate._internal();
+
+  static final EnglishCameraPickerTextDelegate _instance =
+      EnglishCameraPickerTextDelegate._internal();
+
+  @override
+  String confirm = 'Confirm';
+
+  @override
+  String shootingTips = 'Tap to take photo.';
+}

lib/src/widget/camera_picker.dart

@@ -26,12 +26,15 @@ import 'builder/slide_page_transition_builder.dart';
 /// 该选择器可以通过拍照创建 [AssetEntity] ，但由于过程中有的步骤随时会出现问题，
 /// 使用时有较高的概率会遇到失败。
 class CameraPicker extends StatefulWidget {
-  const CameraPicker({
+  CameraPicker({
     Key key,
     this.shouldKeptInLocal = false,
     this.isAllowRecording = false,
     this.theme,
-  }) : super(key: key);
+    CameraPickerTextDelegate textDelegate,
+  }) : super(key: key) {
+    Constants.textDelegate = textDelegate ?? DefaultCameraPickerTextDelegate();
+  }
 
   /// Whether the taken file should be kept in local.
   /// 拍照的文件是否应该保存在本地
@@ -47,7 +50,10 @@ class CameraPicker extends StatefulWidget {
   /// 通过相机创建 [AssetEntity] 的静态方法
   static Future<AssetEntity> pickFromCamera(
     BuildContext context, {
-    bool shouldKeptInLocal = true,
+    bool shouldKeptInLocal = false,
+    bool isAllowRecording = false,
+    ThemeData theme,
+    CameraPickerTextDelegate textDelegate,
   }) async {
     final AssetEntity result = await Navigator.of(
       context,
@@ -56,6 +62,9 @@ class CameraPicker extends StatefulWidget {
       SlidePageTransitionBuilder<AssetEntity>(
         builder: CameraPicker(
           shouldKeptInLocal: shouldKeptInLocal,
+          isAllowRecording: isAllowRecording,
+          theme: theme,
+          textDelegate: textDelegate,
         ),
         transitionCurve: Curves.easeIn,
         transitionDuration: const Duration(milliseconds: 300),
@@ -353,6 +362,24 @@ class _CameraPickerState extends State<CameraPicker> {
     );
   }
 
+  /// Text widget for shooting tips.
+  /// 拍摄的提示文字
+  Widget get tipsTextWidget {
+    return AnimatedOpacity(
+      duration: recordDetectDuration,
+      opacity: isRecording ? 0.0 : 1.0,
+      child: Padding(
+        padding: const EdgeInsets.symmetric(
+          vertical: 20.0,
+        ),
+        child: Text(
+          Constants.textDelegate.shootingTips,
+          style: const TextStyle(fontSize: 15.0),
+        ),
+      ),
+    );
+  }
+
   /// Shooting action section widget.
   /// 拍照操作区
   ///
@@ -588,9 +615,10 @@ class _CameraPickerState extends State<CameraPicker> {
                 child: Padding(
                   padding: const EdgeInsets.symmetric(vertical: 20.0),
                   child: Column(
-                    mainAxisAlignment: MainAxisAlignment.spaceBetween,
                     children: <Widget>[
                       settingsAction,
+                      const Spacer(),
+                      tipsTextWidget,
                       shootingActions,
                     ],
                   ),

lib/wechat_camera_picker.dart

@@ -2,5 +2,6 @@ library wechat_camera_picker;
 
 export 'package:photo_manager/photo_manager.dart';
 
+export 'src/delegates/camera_picker_text_delegate.dart';
 export 'src/widget/camera_picker.dart';
 export 'src/widget/temp_picker.dart';