3 files changed, 178 insertions, 0 deletions
diff --git a/app_expo/components/screen/screen.presets.ts b/app_expo/components/screen/screen.presets.ts
new file mode 100644
index 0000000..aa8d8cf
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+++ b/app_expo/components/screen/screen.presets.ts
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+import { ViewStyle } from 'react-native'
+import { color } from '../../theme'
+
+/**
+ * All screen keyboard offsets.
+ */
+export const offsets = {
+  none: 0,
+}
+
+/**
+ * The variations of keyboard offsets.
+ */
+export type KeyboardOffsets = keyof typeof offsets
+
+/**
+ * All the variations of screens.
+ */
+export const presets = {
+  /**
+   * No scrolling. Suitable for full-screen carousels and components
+   * which have built-in scrolling like FlatList.
+   */
+  fixed: {
+    outer: {
+      backgroundColor: color.background,
+      flex: 1,
+      height: '100%',
+    } as ViewStyle,
+    inner: {
+      justifyContent: 'flex-start',
+      alignItems: 'stretch',
+      height: '100%',
+      width: '100%',
+    } as ViewStyle,
+  },
+
+  /**
+   * Scrolls. Suitable for forms or other things requiring a keyboard.
+   *
+   * Pick this one if you don't know which one you want yet.
+   */
+  scroll: {
+    outer: {
+      backgroundColor: color.background,
+      flex: 1,
+      height: '100%',
+    } as ViewStyle,
+    inner: { justifyContent: 'flex-start', alignItems: 'stretch' } as ViewStyle,
+  },
+}
+
+/**
+ * The variations of screens.
+ */
+export type ScreenPresets = keyof typeof presets
+
+/**
+ * Is this preset a non-scrolling one?
+ *
+ * @param preset The preset to check
+ */
+export function isNonScrolling(preset?: ScreenPresets) {
+  // any of these things will make you scroll
+  return !preset || !presets[preset] || preset === 'fixed'
+}
diff --git a/app_expo/components/screen/screen.props.ts b/app_expo/components/screen/screen.props.ts
new file mode 100644
index 0000000..1371c64
--- /dev/null
+++ b/app_expo/components/screen/screen.props.ts
@@ -0,0 +1,46 @@
+import React from 'react'
+import { StyleProp, ViewStyle } from 'react-native'
+import { KeyboardOffsets, ScreenPresets } from './screen.presets'
+
+export interface ScreenProps {
+  /**
+   * Children components.
+   */
+  children?: React.ReactNode
+
+  /**
+   * An optional style override useful for padding & margin.
+   */
+  style?: StyleProp<ViewStyle>
+
+  /**
+   * One of the different types of presets.
+   */
+  preset?: ScreenPresets
+
+  /**
+   * An optional background color
+   */
+  backgroundColor?: string
+
+  /**
+   * An optional status bar setting. Defaults to light-content.
+   */
+  statusBar?: 'light-content' | 'dark-content'
+
+  /**
+   * Should we not wrap in SafeAreaView? Defaults to false.
+   */
+  unsafe?: boolean
+
+  /**
+   * By how much should we offset the keyboard? Defaults to none.
+   */
+  keyboardOffset?: KeyboardOffsets
+
+  /**
+   * Should keyboard persist on screen tap. Defaults to handled.
+   * Only applies to scroll preset.
+   */
+  keyboardShouldPersistTaps?: 'handled' | 'always' | 'never'
+}
diff --git a/app_expo/components/screen/screen.tsx b/app_expo/components/screen/screen.tsx
new file mode 100644
index 0000000..dafe36e
--- /dev/null
+++ b/app_expo/components/screen/screen.tsx
@@ -0,0 +1,66 @@
+import * as React from 'react'
+import { KeyboardAvoidingView, Platform, ScrollView, StatusBar, View } from 'react-native'
+import { useSafeAreaInsets } from 'react-native-safe-area-context'
+import { ScreenProps } from './screen.props'
+import { isNonScrolling, offsets, presets } from './screen.presets'
+
+const isIos = Platform.OS === 'ios'
+
+function ScreenWithoutScrolling(props: ScreenProps) {
+  const insets = useSafeAreaInsets()
+  const preset = presets.fixed
+  const style = props.style || {}
+  const backgroundStyle = props.backgroundColor ? { backgroundColor: props.backgroundColor } : {}
+  const insetStyle = { paddingTop: props.unsafe ? 0 : insets.top }
+
+  return (
+    <KeyboardAvoidingView
+      style={[preset.outer, backgroundStyle]}
+      behavior={isIos ? 'padding' : undefined}
+      keyboardVerticalOffset={offsets[props.keyboardOffset || 'none']}
+    >
+      <StatusBar barStyle={props.statusBar || 'light-content'} />
+      <View style={[preset.inner, style, insetStyle]}>{props.children}</View>
+    </KeyboardAvoidingView>
+  )
+}
+
+function ScreenWithScrolling(props: ScreenProps) {
+  const insets = useSafeAreaInsets()
+  const preset = presets.scroll
+  const style = props.style || {}
+  const backgroundStyle = props.backgroundColor ? { backgroundColor: props.backgroundColor } : {}
+  const insetStyle = { paddingTop: props.unsafe ? 0 : insets.top }
+
+  return (
+    <KeyboardAvoidingView
+      style={[preset.outer, backgroundStyle]}
+      behavior={isIos ? 'padding' : undefined}
+      keyboardVerticalOffset={offsets[props.keyboardOffset || 'none']}
+    >
+      <StatusBar barStyle={props.statusBar || 'light-content'} />
+      <View style={[preset.outer, backgroundStyle, insetStyle]}>
+        <ScrollView
+          style={[preset.outer, backgroundStyle]}
+          contentContainerStyle={[preset.inner, style]}
+          keyboardShouldPersistTaps={props.keyboardShouldPersistTaps || 'handled'}
+        >
+          {props.children}
+        </ScrollView>
+      </View>
+    </KeyboardAvoidingView>
+  )
+}
+
+/**
+ * The starting component on every screen in the app.
+ *
+ * @param props The screen props
+ */
+export function Screen(props: ScreenProps) {
+  if (isNonScrolling(props.preset)) {
+    return <ScreenWithoutScrolling {...props} />
+  } else {
+    return <ScreenWithScrolling {...props} />
+  }
+}