feat: support for disabling scaling

lib/src/screen_util.dart

@@ -15,6 +15,10 @@ class ScreenUtil {
   static const Size defaultSize = Size(360, 690);
   static ScreenUtil _instance = ScreenUtil._();
 
+  static bool Function() _enableScaleWH = () => true;
+  static bool Function() _enableScaleText = () => true;
+
+
   /// UI设计中手机尺寸 , dp
   /// Size of the phone in UI Design , dp
   late Size _uiSize;
@@ -31,6 +35,16 @@ class ScreenUtil {
 
   factory ScreenUtil() => _instance;
 
+  /// Enable scale
+  ///
+  /// if the enableWH return false, the width and the height scale ratio will be 1
+  /// if the enableText return false, the text scale ratio will be 1
+  ///
+  static void enableScale({bool Function()? enableWH, bool Function()? enableText}) {
+    _enableScaleWH = enableWH ?? () => true;
+    _enableScaleText = enableText ?? () => true;
+  }
+
   /// Manually wait for window size to be initialized
   ///
   /// `Recommended` to use before you need access window size
@@ -197,15 +211,15 @@ class ScreenUtil {
 
   /// 实际尺寸与UI设计的比例
   /// The ratio of actual width to UI design
-  double get scaleWidth => screenWidth / _uiSize.width;
+  double get scaleWidth => !_enableScaleWH() ? 1 : screenWidth / _uiSize.width;
 
   /// The ratio of actual height to UI design
   double get scaleHeight =>
-      (_splitScreenMode ? max(screenHeight, 700) : screenHeight) /
+      !_enableScaleWH() ? 1 : (_splitScreenMode ? max(screenHeight, 700) : screenHeight) /
       _uiSize.height;
 
   double get scaleText =>
-      _minTextAdapt ? min(scaleWidth, scaleHeight) : scaleWidth;
+      !_enableScaleText() ? 1 : (_minTextAdapt ? min(scaleWidth, scaleHeight) : scaleWidth);
 
   /// 根据UI设计的设备宽度适配
   /// 高度也可以根据这个来做适配可以保证不变形,比如你想要一个正方形的时候.