1 files changed, 53 insertions, 0 deletions
diff --git a/lib/layout_size_helper.dart b/lib/layout_size_helper.dart
new file mode 100644
index 0000000..9cbb0d7
--- /dev/null
+++ b/lib/layout_size_helper.dart
@@ -0,0 +1,53 @@
+import 'package:flutter/material.dart';
+
+class LayoutSizeHelper {
+  Size _size;
+  double _ratio;
+
+  LayoutSizeHelper(context)
+      : _size = MediaQuery.of(context).size,
+        _ratio = MediaQuery.of(context).devicePixelRatio;
+
+  update(context) {
+    _size = MediaQuery.of(context).size;
+    _ratio = MediaQuery.of(context).devicePixelRatio;
+  }
+
+  get defaultIconSize {
+    if (_size.height <= 480 || _size.width <= 600) {
+      return 64.0 * _ratio;
+    } else if (_size.height <= 900 || _size.width <= 840) {
+      return 96.0 * _ratio;
+    } else {
+      return 128.0 * _ratio;
+    }
+  }
+
+  get defaultButtonHeight {
+    return defaultIconSize;
+  }
+
+  get defaultButtonWidth {
+    return defaultButtonHeight * 3.0;
+  }
+
+  get defaultPadding {
+    return defaultIconSize / 8.0;
+  }
+
+  get defaultBorder {
+    return defaultIconSize / 16;
+  }
+
+  get baseFontSize {
+    return (defaultIconSize / 3.0).floor().toDouble();
+  }
+
+  get largeIconSize {
+    return 1.5 * defaultIconSize;
+  }
+
+  get largePadding {
+    return largeIconSize / 4.0;
+  }
+}