1 files changed, 48 insertions, 0 deletions
diff --git a/src/utils/layouts.ts b/src/utils/layouts.ts
new file mode 100644
index 00000000..e2f1f0b1
--- /dev/null
+++ b/src/utils/layouts.ts
@@ -0,0 +1,48 @@
+import {PixelRatio, Platform, StatusBar} from 'react-native';
+import {Dimensions} from 'react-native';
+
+export const {width: SCREEN_WIDTH, height: SCREEN_HEIGHT} = Dimensions.get(
+  'window',
+);
+
+export const SCREEN_RATIO = SCREEN_HEIGHT / SCREEN_WIDTH;
+
+/**
+ * Working as of Q1 2021, latest iPhone is 12
+ * iPhone 8/SE has a logical screen ratio of about 1.77
+ * Rest has a logical screen ratio of about 2.16
+ */
+export const isIPhoneX = () =>
+  Platform.OS === 'ios' && !Platform.isPad && !Platform.isTVOS
+    ? SCREEN_RATIO > 2
+    : false;
+
+// Taken from: https://github.com/react-navigation/react-navigation/issues/283
+export const HeaderHeight = Platform.select({
+  ios: 44,
+  android: 56,
+  default: 64,
+});
+
+export const StatusBarHeight = Platform.select({
+  ios: isIPhoneX() ? 44 : 20,
+  android: StatusBar.currentHeight,
+  default: 0,
+});
+
+export const AvatarHeaderHeight = (HeaderHeight + StatusBarHeight) * 1.3;
+
+/**
+ * This is a function for normalizing the font size for different devices, based on iphone 8.
+ *
+ * E.g. font size 13 on an iphone 8 is 13, but on an iPhone 11 is
+ * 14.5
+ */
+export const normalize = (fontSize: number) => {
+  // based on iphone 8 logical screen width
+  const scale = SCREEN_WIDTH / 375;
+  let newSize = fontSize * scale;
+  // round to the nearest 0.5
+  newSize = Math.round(PixelRatio.roundToNearestPixel(newSize) * 2) / 2;
+  return newSize;
+};