✨ CameraPickerConfig.enableScaledPreview (#108)

Author: AlexV525

CHANGELOG.md

@@ -6,6 +6,10 @@ that can be found in the LICENSE file. -->
 
 ## 3.3.1
 
+### New features
+
+- Add `enableScaledPreview`. (#108)
+
 ### Improvements
 
 - Prevent unnecessary zoom updates. (#107)
@@ -32,7 +36,7 @@ that can be found in the LICENSE file. -->
 
 ### New features
 
-- Introduce `onXFileCaptured`. (#87)
+- Add `onXFileCaptured`. (#87)
 
 ## 3.0.4
 

example/lib/models/picker_method.dart

@@ -116,7 +116,17 @@ List<PickMethod> get pickMethods {
       ),
     ),
     PickMethod(
-      icon: '🔎',
+      icon: '🔍',
+      name: 'Prevent scaling for camera preview',
+      description: 'Camera preview will not be scaled to cover '
+          'the whole screen of the device, only fit with the raw size.',
+      method: (BuildContext context) => CameraPicker.pickFromCamera(
+        context,
+        pickerConfig: const CameraPickerConfig(enableScaledPreview: false),
+      ),
+    ),
+    PickMethod(
+      icon: '🌀',
       name: 'Lower resolutions',
       description: 'Use a lower resolution preset might be helpful '
           'in some specific scenarios.',

lib/src/constants/config.dart

@@ -23,6 +23,7 @@ class CameraPickerConfig {
     this.enableExposureControlOnPoint = true,
     this.enablePinchToZoom = true,
     this.enablePullToZoomInRecord = true,
+    this.enableScaledPreview = true,
     this.shouldDeletePreviewFile = false,
     this.shouldAutoPreviewVideo = false,
     this.maximumRecordingDuration = const Duration(seconds: 15),
@@ -78,6 +79,10 @@ class CameraPickerConfig {
   /// 用户是否可以在录制视频时上拉缩放
   final bool enablePullToZoomInRecord;
 
+  /// Whether the camera preview should be scaled during captures.
+  /// 拍摄过程中相机预览是否需要缩放
+  final bool enableScaledPreview;
+
   /// {@template wechat_camera_picker.shouldDeletePreviewFile}
   /// Whether the preview file will be delete when pop.
   /// 返回页面时是否删除预览文件

lib/src/widgets/camera_picker.dart

@@ -1327,15 +1327,21 @@ class CameraPickerState extends State<CameraPicker>
       controller,
       preview,
     );
-    preview = transformedWidget ?? preview;
-
-    preview = RotatedBox(
-      quarterTurns: -config.cameraQuarterTurns,
-      child: Transform.scale(
+    preview = Center(child: transformedWidget ?? preview);
+    // Scale the preview if the config is enabled.
+    if (config.enableScaledPreview) {
+      preview = Transform.scale(
         scale: _effectiveCameraScale(constraints, controller),
-        child: Center(child: preview),
-      ),
-    );
+        child: preview,
+      );
+    }
+    // Rotated the preview if the turns is valid.
+    if (config.cameraQuarterTurns % 4 != 0) {
+      preview = RotatedBox(
+        quarterTurns: -config.cameraQuarterTurns,
+        child: preview,
+      );
+    }
     return preview;
   }