Files
studysprint/app/(tabs)/timer.tsx
2026-04-25 15:43:31 +02:00

809 lines
22 KiB
TypeScript

import * as Haptics from 'expo-haptics';
import * as React from 'react';
import {
Animated,
Dimensions,
Easing,
StatusBar,
StyleSheet,
Text,
TouchableOpacity,
View,
} from 'react-native';
const { width, height } = Dimensions.get('window');
const colors = {
black: '#323F4E',
red: '#F76A6A',
text: '#ffffff',
};
const TIMER_OPTIONS = [...Array(13).keys()].map((index) => (index === 0 ? 1 : index * 5));
const ITEM_SIZE = width * 0.38;
const ITEM_SPACING = (width - ITEM_SIZE) / 2;
const TIMER_UNIT_IN_SECONDS = 60;
const HOLD_TO_CANCEL_MS = 2000;
const CANCEL_ANIMATION_DELAY_MS = 250;
const BUTTON_PRESS_IN_MS = 80;
const BUTTON_PRESS_OUT_MS = 140;
const placeholderTask = {
name: 'Read chapter 4',
description: 'Focus on the summary questions and write down anything unclear.',
};
function formatTime(totalSeconds: number) {
const minutes = Math.floor(totalSeconds / 60);
const seconds = totalSeconds % 60;
return `${minutes.toString().padStart(2, '0')}:${seconds.toString().padStart(2, '0')}`;
}
export default function TimerScreen() {
const [containerHeight, setContainerHeight] = React.useState(0);
const [duration, setDuration] = React.useState(TIMER_OPTIONS[0]);
const [timerIsRunning, setIsRunning] = React.useState(false);
const [timeRemaining, setTimeRemaining] = React.useState(0);
const scrollX = React.useRef(new Animated.Value(0)).current;
const timerAnimation = React.useRef(new Animated.Value(0)).current;
const buttonAnimation = React.useRef(new Animated.Value(0)).current;
const taskDetailsAnimation = React.useRef(new Animated.Value(0)).current;
const countdownAnimation = React.useRef(new Animated.Value(0)).current;
const cancelButtonAnimation = React.useRef(new Animated.Value(0)).current;
const pressedButtonAnimation = React.useRef(new Animated.Value(0)).current;
const focusModeAnimation = React.useRef(new Animated.Value(0)).current;
const cancelOverlayAnimation = React.useRef(new Animated.Value(0)).current;
const countdownRef = React.useRef<ReturnType<typeof setInterval> | null>(null);
const cancelHoldTimeoutRef = React.useRef<ReturnType<typeof setTimeout> | null>(null);
const cancelHoldAnimationDelayRef = React.useRef<ReturnType<typeof setTimeout> | null>(null);
const runningAnimationRef = React.useRef<Animated.CompositeAnimation | null>(null);
const progressAnimationRef = React.useRef<Animated.CompositeAnimation | null>(null);
const sessionStartedAtRef = React.useRef<number | null>(null);
const sessionDurationMsRef = React.useRef(0);
const cancelAccelStartedRef = React.useRef(false);
const cancelHoldActiveRef = React.useRef(false);
const cancelHoldIdRef = React.useRef(0);
const cancelHoldStartedAtRef = React.useRef(0);
React.useEffect(() => {
if (containerHeight > 0 && !timerIsRunning) {
timerAnimation.setValue(containerHeight);
}
}, [containerHeight, timerIsRunning, timerAnimation]);
const pressedButtonScale = pressedButtonAnimation.interpolate({
inputRange: [0, 1],
outputRange: [1, 0.9],
});
const cancelButtonTranslateY = cancelButtonAnimation.interpolate({
inputRange: [0, 1],
outputRange: [16, 0],
});
// Real timer progress comes from timerAnimation. The cancel hold adds a
// temporary visual offset on top so release/cancel logic does not fight the
// underlying progress animation.
const timerOverlayTranslateY = Animated.add(
timerAnimation,
cancelOverlayAnimation
).interpolate({
inputRange: [0, Math.max(containerHeight, 1)],
outputRange: [0, Math.max(containerHeight, 1)],
extrapolate: 'clamp',
});
const countdownTranslateX = focusModeAnimation.interpolate({
inputRange: [0, 1],
outputRange: [0, -width * 0.3],
});
const countdownTranslateY = focusModeAnimation.interpolate({
inputRange: [0, 1],
outputRange: [0, -containerHeight * 0.35],
});
const countdownScale = focusModeAnimation.interpolate({
inputRange: [0, 1],
outputRange: [1, 0.55],
});
const startButtonOpacity = buttonAnimation.interpolate({
inputRange: [0, 1],
outputRange: [1, 0],
});
const startButtonTranslateY = buttonAnimation.interpolate({
inputRange: [0, 1],
outputRange: [0, 200],
});
const pickerOpacity = buttonAnimation.interpolate({
inputRange: [0, 1],
outputRange: [1, 0],
});
const taskDetailsOpacity = taskDetailsAnimation.interpolate({
inputRange: [0, 1],
outputRange: [0, 1],
});
const taskDetailsTranslateY = taskDetailsAnimation.interpolate({
inputRange: [0, 1],
outputRange: [20, 0],
});
const clearCountdownInterval = React.useCallback(() => {
if (countdownRef.current) {
clearInterval(countdownRef.current);
countdownRef.current = null;
}
}, []);
const clearCancelHoldTimeouts = React.useCallback(() => {
if (cancelHoldTimeoutRef.current) {
clearTimeout(cancelHoldTimeoutRef.current);
cancelHoldTimeoutRef.current = null;
}
if (cancelHoldAnimationDelayRef.current) {
clearTimeout(cancelHoldAnimationDelayRef.current);
cancelHoldAnimationDelayRef.current = null;
}
}, []);
const stopRunningAnimations = React.useCallback(() => {
runningAnimationRef.current?.stop();
runningAnimationRef.current = null;
progressAnimationRef.current?.stop();
progressAnimationRef.current = null;
cancelOverlayAnimation.stopAnimation();
}, [cancelOverlayAnimation]);
React.useEffect(() => {
return () => {
clearCountdownInterval();
clearCancelHoldTimeouts();
stopRunningAnimations();
};
}, [clearCancelHoldTimeouts, clearCountdownInterval, stopRunningAnimations]);
const animateButtonPress = React.useCallback(
(pressed: boolean) => {
Animated.timing(pressedButtonAnimation, {
toValue: pressed ? 1 : 0,
duration: pressed ? BUTTON_PRESS_IN_MS : BUTTON_PRESS_OUT_MS,
useNativeDriver: true,
}).start();
},
[pressedButtonAnimation]
);
const resetSessionValues = React.useCallback(() => {
sessionStartedAtRef.current = null;
sessionDurationMsRef.current = 0;
cancelHoldActiveRef.current = false;
cancelAccelStartedRef.current = false;
timerAnimation.setValue(containerHeight);
cancelOverlayAnimation.setValue(0);
setTimeRemaining(0);
setIsRunning(false);
}, [cancelOverlayAnimation, containerHeight, timerAnimation]);
const finishTimer = React.useCallback(() => {
clearCountdownInterval();
Animated.parallel([
Animated.timing(countdownAnimation, {
toValue: 0,
duration: 200,
useNativeDriver: true,
}),
Animated.timing(focusModeAnimation, {
toValue: 0,
duration: 250,
useNativeDriver: true,
}),
Animated.timing(taskDetailsAnimation, {
toValue: 0,
duration: 300,
useNativeDriver: true,
}),
]).start(() => {
Animated.parallel([
Animated.timing(buttonAnimation, {
toValue: 0,
duration: 300,
useNativeDriver: true,
}),
Animated.timing(cancelButtonAnimation, {
toValue: 0,
duration: 300,
useNativeDriver: true,
}),
]).start(() => {
setIsRunning(false);
/* TODO
Implement store and send of ellapsed time value in seconds to DB
for total time spent statistic
*/
resetSessionValues();
});
});
}, [
buttonAnimation,
cancelButtonAnimation,
clearCountdownInterval,
countdownAnimation,
focusModeAnimation,
resetSessionValues,
taskDetailsAnimation,
]);
// This picks up the timer overlay animation from the current Y position and
// runs it to the bottom over the remaining session time.
const startProgressAnimation = React.useCallback(
(fromY: number) => {
const elapsedRatio = fromY / containerHeight;
const remainingMs = sessionDurationMsRef.current * (1 - elapsedRatio);
sessionStartedAtRef.current = Date.now() - sessionDurationMsRef.current * elapsedRatio;
timerAnimation.setValue(fromY);
const progressAnimation = Animated.timing(timerAnimation, {
toValue: containerHeight,
duration: remainingMs,
useNativeDriver: true,
});
progressAnimationRef.current = progressAnimation;
progressAnimation.start(({ finished }) => {
progressAnimationRef.current = null;
if (!finished) {
return;
}
finishTimer();
});
},
[containerHeight, finishTimer, timerAnimation]
);
const runStartSequence = React.useCallback(() => {
const runningAnimation = Animated.sequence([
Animated.parallel([
Animated.timing(buttonAnimation, {
toValue: 1,
duration: 300,
useNativeDriver: true,
}),
Animated.timing(cancelButtonAnimation, {
toValue: 1,
duration: 300,
useNativeDriver: true,
}),
Animated.timing(countdownAnimation, {
toValue: 1,
duration: 300,
useNativeDriver: true,
}),
Animated.timing(timerAnimation, {
toValue: 0,
duration: 300,
useNativeDriver: true,
}),
]),
Animated.timing(focusModeAnimation, {
toValue: 1,
duration: 450,
useNativeDriver: true,
}),
Animated.timing(taskDetailsAnimation, {
toValue: 1,
duration: 500,
useNativeDriver: true,
}),
]);
runningAnimationRef.current = runningAnimation;
runningAnimation.start(({ finished }) => {
runningAnimationRef.current = null;
if (!finished) {
return;
}
startProgressAnimation(0);
});
}, [
buttonAnimation,
cancelButtonAnimation,
countdownAnimation,
focusModeAnimation,
startProgressAnimation,
taskDetailsAnimation,
timerAnimation,
]);
const startCountdown = React.useCallback(
(totalSeconds: number) => {
setTimeRemaining(totalSeconds);
clearCountdownInterval();
countdownRef.current = setInterval(() => {
setTimeRemaining((currentTime) => {
if (currentTime <= 1) {
clearCountdownInterval();
return 0;
}
return currentTime - 1;
});
}, 1000);
},
[clearCountdownInterval]
);
const startTimerSession = React.useCallback(() => {
if (timerIsRunning || containerHeight === 0) {
return;
}
Haptics.notificationAsync(Haptics.NotificationFeedbackType.Success);
setIsRunning(true);
taskDetailsAnimation.setValue(0);
countdownAnimation.setValue(0);
cancelOverlayAnimation.setValue(0);
const totalSeconds = duration * TIMER_UNIT_IN_SECONDS;
sessionStartedAtRef.current = Date.now();
sessionDurationMsRef.current = totalSeconds * 1000;
startCountdown(totalSeconds);
runStartSequence();
}, [
cancelOverlayAnimation,
containerHeight,
countdownAnimation,
duration,
runStartSequence,
startCountdown,
taskDetailsAnimation,
timerIsRunning,
]);
const cancelTimer = React.useCallback(() => {
if (!timerIsRunning) {
return;
}
clearCountdownInterval();
clearCancelHoldTimeouts();
stopRunningAnimations();
Animated.parallel([
Animated.timing(cancelButtonAnimation, {
toValue: 0,
duration: 180,
useNativeDriver: true,
}),
Animated.timing(taskDetailsAnimation, {
toValue: 0,
duration: 220,
useNativeDriver: true,
}),
Animated.timing(focusModeAnimation, {
toValue: 0,
duration: 250,
useNativeDriver: true,
}),
Animated.timing(countdownAnimation, {
toValue: 0,
duration: 180,
useNativeDriver: true,
}),
Animated.timing(timerAnimation, {
toValue: containerHeight,
duration: 300,
useNativeDriver: true,
}),
Animated.timing(cancelOverlayAnimation, {
toValue: 0,
duration: 120,
useNativeDriver: true,
}),
]).start(() => {
Animated.timing(buttonAnimation, {
toValue: 0,
duration: 220,
useNativeDriver: true,
}).start(() => {
resetSessionValues();
});
});
}, [
buttonAnimation,
cancelButtonAnimation,
cancelOverlayAnimation,
clearCancelHoldTimeouts,
clearCountdownInterval,
containerHeight,
countdownAnimation,
focusModeAnimation,
resetSessionValues,
stopRunningAnimations,
taskDetailsAnimation,
timerAnimation,
timerIsRunning,
]);
const handleCancelHoldStart = React.useCallback(() => {
animateButtonPress(true);
cancelHoldIdRef.current += 1;
const cancelHoldId = cancelHoldIdRef.current;
cancelHoldActiveRef.current = true;
cancelHoldStartedAtRef.current = Date.now();
cancelAccelStartedRef.current = false;
cancelHoldAnimationDelayRef.current = setTimeout(() => {
cancelHoldAnimationDelayRef.current = null;
if (!cancelHoldActiveRef.current || cancelHoldIdRef.current !== cancelHoldId) {
return;
}
// The hold starts with normal button feedback. After a short delay, we
// begin the accelerated red overlay preview so quick taps do not cause a
// jolt, while long holds still clearly show that cancel is about to fire.
cancelAccelStartedRef.current = true;
cancelOverlayAnimation.setValue(0);
const elapsedHoldMs = Date.now() - cancelHoldStartedAtRef.current;
const remainingHoldMs = Math.max(1, HOLD_TO_CANCEL_MS - elapsedHoldMs);
const sessionStartedAt = sessionStartedAtRef.current ?? Date.now();
const elapsedAtCancelMs = Date.now() + remainingHoldMs - sessionStartedAt;
const expectedProgress = elapsedAtCancelMs / sessionDurationMsRef.current;
const clampedProgress = Math.max(0, Math.min(expectedProgress, 1));
const expectedYAtCancel = containerHeight * clampedProgress;
const cancelOffset = Math.max(0, containerHeight - expectedYAtCancel);
Animated.timing(cancelOverlayAnimation, {
toValue: cancelOffset,
duration: remainingHoldMs,
easing: Easing.in(Easing.quad),
useNativeDriver: true,
}).start();
}, CANCEL_ANIMATION_DELAY_MS);
cancelHoldTimeoutRef.current = setTimeout(() => {
cancelHoldActiveRef.current = false;
cancelHoldIdRef.current += 1;
cancelAccelStartedRef.current = false;
Haptics.notificationAsync(Haptics.NotificationFeedbackType.Warning);
cancelTimer();
cancelHoldTimeoutRef.current = null;
}, HOLD_TO_CANCEL_MS);
}, [animateButtonPress, cancelOverlayAnimation, cancelTimer, containerHeight]);
const handleCancelHoldEnd = React.useCallback(() => {
animateButtonPress(false);
cancelHoldActiveRef.current = false;
cancelHoldIdRef.current += 1;
clearCancelHoldTimeouts();
if (!cancelAccelStartedRef.current) {
return;
}
cancelAccelStartedRef.current = false;
cancelOverlayAnimation.stopAnimation((currentOffset) => {
cancelOverlayAnimation.setValue(currentOffset);
Animated.timing(cancelOverlayAnimation, {
toValue: 0,
duration: 750,
easing: Easing.in(Easing.bounce),
useNativeDriver: true,
}).start();
});
}, [animateButtonPress, cancelOverlayAnimation, clearCancelHoldTimeouts]);
const handleTimerPickerMomentumEnd = React.useCallback(
(event: { nativeEvent: { contentOffset: { x: number } } }) => {
if (timerIsRunning) {
return;
}
const index = Math.round(event.nativeEvent.contentOffset.x / ITEM_SIZE);
const clampedIndex = Math.max(0, Math.min(index, TIMER_OPTIONS.length - 1));
setDuration(TIMER_OPTIONS[clampedIndex]);
},
[timerIsRunning]
);
const renderTimerItem = React.useCallback(
({ item, index }: { item: number; index: number }) => {
const inputRange = [
(index - 1) * ITEM_SIZE,
index * ITEM_SIZE,
(index + 1) * ITEM_SIZE,
];
const baseOpacity = scrollX.interpolate({
inputRange,
outputRange: [0.4, 1, 0.4],
});
const opacity = Animated.multiply(baseOpacity, pickerOpacity);
const scale = scrollX.interpolate({
inputRange,
outputRange: [0.7, 1, 0.7],
});
return (
<View style={styles.timerOptionItem}>
<Animated.Text
style={[
styles.text,
{
opacity,
transform: [{ scale }],
},
]}
>
{item}
</Animated.Text>
</View>
);
},
[pickerOpacity, scrollX]
);
return (
<View
style={styles.container}
onLayout={(event) => {
setContainerHeight(event.nativeEvent.layout.height);
}}
>
<StatusBar hidden />
<Animated.View
style={[
StyleSheet.absoluteFillObject,
styles.timerOverlay,
{
height: containerHeight,
width,
transform: [{ translateY: timerOverlayTranslateY }],
},
]}
/>
<Animated.View
style={[
StyleSheet.absoluteFillObject,
styles.startButtonContainer,
{
opacity: startButtonOpacity,
transform: [{ translateY: startButtonTranslateY }],
},
]}
>
<TouchableOpacity
disabled={timerIsRunning}
onPress={startTimerSession}
onPressIn={() => animateButtonPress(true)}
onPressOut={() => animateButtonPress(false)}
>
<Animated.View
style={[
styles.roundButton,
{
transform: [{ scale: pressedButtonScale }],
},
]}
>
<Text className="text-text-main text-xl">Start</Text>
<Text className="text-text-main text-xl">Sprint</Text>
</Animated.View>
</TouchableOpacity>
</Animated.View>
<Animated.View
pointerEvents={timerIsRunning ? 'auto' : 'none'}
style={[
styles.cancelButtonContainer,
{
opacity: cancelButtonAnimation,
transform: [{ translateY: cancelButtonTranslateY }],
},
]}
>
<TouchableOpacity onPressIn={handleCancelHoldStart} onPressOut={handleCancelHoldEnd}>
<Animated.View
style={[
styles.cancelButton,
{
transform: [{ scale: pressedButtonScale }],
},
]}
>
<Text className="text-text-main text-xl">Hold to end sprint</Text>
</Animated.View>
</TouchableOpacity>
</Animated.View>
<Animated.View
pointerEvents="none"
style={[
styles.countdownOverlay,
{
opacity: countdownAnimation,
transform: [
{ translateX: countdownTranslateX },
{ translateY: countdownTranslateY },
{ scale: countdownScale },
],
},
]}
>
<Text style={styles.countdownText}>{formatTime(timeRemaining)}</Text>
</Animated.View>
<View
style={[
styles.timerPickerWrapper,
{
top: containerHeight / 3,
},
]}
>
<Animated.FlatList
data={TIMER_OPTIONS}
scrollEnabled={!timerIsRunning}
keyExtractor={(item) => item.toString()}
horizontal
bounces={false}
onScroll={Animated.event([{ nativeEvent: { contentOffset: { x: scrollX } } }], {
useNativeDriver: true,
})}
showsHorizontalScrollIndicator={false}
onMomentumScrollEnd={handleTimerPickerMomentumEnd}
snapToInterval={ITEM_SIZE}
decelerationRate="fast"
style={styles.timerPickerList}
contentContainerStyle={styles.timerPickerContent}
renderItem={renderTimerItem}
/>
</View>
<Animated.View
pointerEvents="none"
style={[
styles.taskDetails,
{
opacity: taskDetailsOpacity,
transform: [{ translateY: taskDetailsTranslateY }],
},
]}
>
<Text style={styles.taskName}>{placeholderTask.name}</Text>
<Text style={styles.taskDescription}>{placeholderTask.description}</Text>
</Animated.View>
</View>
);
}
const styles = StyleSheet.create({
container: {
flex: 1,
backgroundColor: colors.black,
},
timerOverlay: {
backgroundColor: colors.red,
},
startButtonContainer: {
justifyContent: 'flex-end',
alignItems: 'center',
paddingBottom: 100,
},
roundButton: {
width: 80,
height: 80,
borderRadius: 80,
backgroundColor: '#beb9a7',
alignItems: 'center',
justifyContent: 'center',
},
timerPickerWrapper: {
position: 'absolute',
left: 0,
right: 0,
flex: 1,
},
timerPickerList: {
flexGrow: 0,
},
timerPickerContent: {
paddingHorizontal: ITEM_SPACING,
},
timerOptionItem: {
width: ITEM_SIZE,
justifyContent: 'center',
alignItems: 'center',
},
text: {
fontSize: ITEM_SIZE * 0.8,
fontFamily: 'Menlo',
color: colors.text,
fontWeight: '900',
},
taskDetails: {
position: 'absolute',
top: height * 0.34,
left: 32,
right: 32,
alignItems: 'center',
},
taskName: {
color: colors.text,
fontSize: 32,
fontWeight: '800',
textAlign: 'center',
},
taskDescription: {
color: colors.text,
fontSize: 24,
lineHeight: 32,
marginTop: 20,
textAlign: 'center',
},
countdownText: {
fontSize: ITEM_SIZE * 0.32,
fontFamily: 'Menlo',
color: colors.text,
fontWeight: '900',
textAlign: 'center',
},
cancelButtonContainer: {
position: 'absolute',
left: 0,
right: 0,
bottom: 44,
alignItems: 'center',
zIndex: 2,
},
cancelButton: {
minWidth: 112,
height: 44,
borderRadius: 22,
borderWidth: 1,
borderColor: 'rgba(155, 155, 155, 0.35)',
backgroundColor: '#beb9a7',
alignItems: 'center',
justifyContent: 'center',
paddingHorizontal: 22,
position: 'relative',
overflow: 'hidden',
},
countdownOverlay: {
position: 'absolute',
top: height / 3,
left: 0,
right: 0,
alignItems: 'center',
},
});