import React, { useState } from "react";
import { FlatList, Platform, ScrollView, Slider, StyleSheet, Switch, Text, TouchableWithoutFeedback, View } from "react-native";
import Constants from "expo-constants";
const fontStyles = ["normal", "italic"];
const fontVariants = [
undefined,
"small-caps",
"oldstyle-nums",
"lining-nums",
"tabular-nums",
"proportional-nums"
];
const fontWeights = [
"normal",
"bold",
"100",
"200",
"300",
"400",
"500",
"600",
"700",
"800",
"900"
];
const textAlignments = ["auto", "left", "right", "center", "justify"];
const textDecorationLines = [
"none",
"underline",
"line-through",
"underline line-through"
];
const textDecorationStyles = ["solid", "double", "dotted", "dashed"];
const textTransformations = ["none", "uppercase", "lowercase", "capitalize"];
const textAlignmentsVertical = ["auto", "top", "bottom", "center"];
const writingDirections = ["auto", "ltr", "rtl"];
export default function App() {
const [fontSize, setFontSize] = useState(10);
const [fontStyleIdx, setFontStyleIdx] = useState(0);
const [fontWeightIdx, setFontWeightIdx] = useState(0);
const [lineHeight, setLineHeight] = useState(10);
const [textAlignIdx, setTextAlignIdx] = useState(0);
const [textDecorationLineIdx, setTextDecorationLineIdx] = useState(0);
const [includeFontPadding, setIncludeFontPadding] = useState(false);
const [textVerticalAlignIdx, setTextVerticalAlignIdx] = useState(0);
const [fontVariantIdx, setFontVariantIdx] = useState(0);
const [letterSpacing, setLetterSpacing] = useState(0);
const [textDecorationStyleIdx, setTextDecorationStyleIdx] = useState(0);
const [textTransformIdx, setTextTransformIdx] = useState(0);
const [writingDirectionIdx, setWritingDirectionIdx] = useState(0);
const [textShadowRadius, setTextShadowRadius] = useState(0);
const [textShadowOffset, setTextShadowOffset] = useState({
height: 0,
width: 0
});
return (
<View style={styles.container}>
<Text
style={[
styles.paragraph,
{
fontSize,
fontStyle: fontStyles[fontStyleIdx],
fontWeight: fontWeights[fontWeightIdx],
lineHeight,
textAlign: textAlignments[textAlignIdx],
textDecorationLine: textDecorationLines[textDecorationLineIdx],
textTransform: textTransformations[textTransformIdx],
textAlignVertical: textAlignmentsVertical[textVerticalAlignIdx],
fontVariant: [fontVariants[fontVariantIdx]],
letterSpacing,
includeFontPadding,
textDecorationStyle: textDecorationStyles[textDecorationStyleIdx],
writingDirection: writingDirections[writingDirectionIdx],
textShadowOffset,
textShadowRadius
}
]}
>
Lorem Ipsum is simply dummy text of the printing and typesetting
industry. 112 Likes
</Text>
<ScrollView>
<View>
<Text>Common platform properties</Text>
<CustomSlider
label="Text Shadow Offset - Height"
value={textShadowOffset.height}
minimumValue={-40}
maximumValue={40}
handleValueChange={val =>
setTextShadowOffset(prev => ({ ...prev, height: val }))
}
/>
<CustomSlider
label="Text Shadow Offset - Width"
value={textShadowOffset.width}
minimumValue={-40}
maximumValue={40}
handleValueChange={val =>
setTextShadowOffset(prev => ({ ...prev, width: val }))
}
/>
<CustomSlider
label="Font Size"
value={fontSize}
maximumValue={40}
handleValueChange={setFontSize}
/>
<CustomPicker
label="Font Style"
data={fontStyles}
currentIndex={fontStyleIdx}
onSelected={setFontStyleIdx}
/>
<CustomPicker
label="Font Weight"
data={fontWeights}
currentIndex={fontWeightIdx}
onSelected={setFontWeightIdx}
/>
<CustomSlider
label="Line Height"
value={lineHeight}
minimumValue={10}
maximumValue={50}
handleValueChange={setLineHeight}
/>
<CustomPicker
label="Text Align"
data={textAlignments}
currentIndex={textAlignIdx}
onSelected={setTextAlignIdx}
/>
<CustomPicker
label="Text Decoration Line"
data={textDecorationLines}
currentIndex={textDecorationLineIdx}
onSelected={setTextDecorationLineIdx}
/>
<CustomSlider
label="Text Shadow Radius"
value={textShadowRadius}
handleValueChange={setTextShadowRadius}
/>
<CustomPicker
label="Font Variant"
data={fontVariants}
currentIndex={fontVariantIdx}
onSelected={setFontVariantIdx}
/>
<CustomSlider
label="Letter Spacing"
step={0.1}
value={letterSpacing}
handleValueChange={setLetterSpacing}
/>
<CustomPicker
label="Text Transform"
data={textTransformations}
currentIndex={textTransformIdx}
onSelected={setTextTransformIdx}
/>
</View>
{Platform.OS === "android" && (
<View style={styles.platformContainer}>
<Text style={styles.platformContainerTitle}>
Android only properties
</Text>
<CustomPicker
label="Text Vertical Align"
data={textAlignmentsVertical}
currentIndex={textVerticalAlignIdx}
onSelected={setTextVerticalAlignIdx}
/>
<CustomSwitch
label="Include Font Padding"
handleValueChange={setIncludeFontPadding}
value={includeFontPadding}
/>
</View>
)}
{Platform.OS === "ios" && (
<View style={styles.platformContainer}>
<Text style={styles.platformContainerTitle}>
iOS only properties
</Text>
<CustomPicker
label="Text Decoration Style"
data={textDecorationStyles}
currentIndex={textDecorationStyleIdx}
onSelected={setTextDecorationStyleIdx}
/>
<CustomPicker
label="Writing Direction"
data={writingDirections}
currentIndex={writingDirectionIdx}
onSelected={setWritingDirectionIdx}
/>
</View>
)}
</ScrollView>
</View>
);
}
function CustomSwitch({ label, handleValueChange, value }) {
return (
<>
<Text style={styles.title}>{label}</Text>
<View style={{ alignItems: "flex-start" }}>
<Switch
trackColor={{ false: "#767577", true: "#DAA520" }}
thumbColor={value ? "#DAA520" : "#f4f3f4"}
onValueChange={handleValueChange}
value={value}
/>
</View>
</>
);
}
function CustomSlider({
label,
handleValueChange,
step = 1,
minimumValue = 0,
maximumValue = 10,
value
}) {
return (
<>
{label && (
<Text style={styles.title}>{`${label} (${value.toFixed(2)})`}</Text>
)}
<View style={styles.wrapperHorizontal}>
<Slider
thumbTintColor="#DAA520"
minimumTrackTintColor="#DAA520"
minimumValue={minimumValue}
maximumValue={maximumValue}
step={step}
onValueChange={handleValueChange}
value={value}
/>
</View>
</>
);
}
function CustomPicker({ label, data, currentIndex, onSelected }) {
return (
<>
<Text style={styles.title}>{label}</Text>
<View style={styles.wrapperHorizontal}>
<FlatList
bounces
horizontal
data={data}
keyExtractor={(item, idx) => String(item)}
renderItem={({ item, index }) => {
const selected = index === currentIndex;
return (
<TouchableWithoutFeedback onPress={() => onSelected(index)}>
<View
style={[
styles.itemStyleHorizontal,
selected && styles.itemSelectedStyleHorizontal
]}
>
<Text
style={{
textAlign: "center",
color: selected ? "black" : "grey",
fontWeight: selected ? "bold" : "normal"
}}
>
{item + ""}
</Text>
</View>
</TouchableWithoutFeedback>
);
}}
/>
</View>
</>
);
}
const styles = StyleSheet.create({
container: {
flex: 1,
paddingTop: Constants.statusBarHeight,
backgroundColor: "#ecf0f1",
padding: 8
},
paragraph: {
color: "black",
textDecorationColor: "yellow",
textShadowColor: "red",
textShadowRadius: 1,
margin: 24
},
wrapperHorizontal: {
height: 54,
justifyContent: "center",
color: "black",
marginBottom: 12
},
itemStyleHorizontal: {
marginRight: 10,
height: 50,
padding: 8,
borderWidth: 1,
borderColor: "grey",
borderRadius: 25,
textAlign: "center",
justifyContent: "center"
},
itemSelectedStyleHorizontal: {
borderWidth: 2,
borderColor: "#DAA520"
},
platformContainer: {
marginTop: 8,
borderTopWidth: 1
},
platformContainerTitle: {
marginTop: 8
},
title: {
fontWeight: "bold",
marginVertical: 4
}
});
