@ionic/core
Version:
Base components for Ionic
431 lines (430 loc) • 19.4 kB
JavaScript
/*!
* (C) Ionic http://ionicframework.com - MIT License
*/
import { findClosestIonContent, isIonContent } from "../../../utils/content/index";
import { createGesture } from "../../../utils/gesture/index";
import { clamp, getElementRoot, raf } from "../../../utils/helpers";
import { FOCUS_TRAP_DISABLE_CLASS } from "../../../utils/overlays";
import { getBackdropValueForSheet } from "../utils";
import { calculateSpringStep, handleCanDismiss } from "./utils";
export const createSheetGesture = (baseEl, backdropEl, wrapperEl, initialBreakpoint, backdropBreakpoint, animation, breakpoints = [], expandToScroll, getCurrentBreakpoint, onDismiss, onBreakpointChange) => {
// Defaults for the sheet swipe animation
const defaultBackdrop = [
{ offset: 0, opacity: 'var(--backdrop-opacity)' },
{ offset: 1, opacity: 0.01 },
];
const customBackdrop = [
{ offset: 0, opacity: 'var(--backdrop-opacity)' },
{ offset: 1 - backdropBreakpoint, opacity: 0 },
{ offset: 1, opacity: 0 },
];
const SheetDefaults = {
WRAPPER_KEYFRAMES: [
{ offset: 0, transform: 'translateY(0%)' },
{ offset: 1, transform: 'translateY(100%)' },
],
BACKDROP_KEYFRAMES: backdropBreakpoint !== 0 ? customBackdrop : defaultBackdrop,
CONTENT_KEYFRAMES: [
{ offset: 0, maxHeight: '100%' },
{ offset: 1, maxHeight: '0%' },
],
};
const contentEl = baseEl.querySelector('ion-content');
const height = wrapperEl.clientHeight;
let currentBreakpoint = initialBreakpoint;
let offset = 0;
let canDismissBlocksGesture = false;
let cachedScrollEl = null;
const canDismissMaxStep = 0.95;
const maxBreakpoint = breakpoints[breakpoints.length - 1];
const minBreakpoint = breakpoints[0];
const wrapperAnimation = animation.childAnimations.find((ani) => ani.id === 'wrapperAnimation');
const backdropAnimation = animation.childAnimations.find((ani) => ani.id === 'backdropAnimation');
const contentAnimation = animation.childAnimations.find((ani) => ani.id === 'contentAnimation');
const enableBackdrop = () => {
baseEl.style.setProperty('pointer-events', 'auto');
backdropEl.style.setProperty('pointer-events', 'auto');
/**
* When the backdrop is enabled, elements such
* as inputs should not be focusable outside
* the sheet.
*/
baseEl.classList.remove(FOCUS_TRAP_DISABLE_CLASS);
};
const disableBackdrop = () => {
baseEl.style.setProperty('pointer-events', 'none');
backdropEl.style.setProperty('pointer-events', 'none');
/**
* When the backdrop is enabled, elements such
* as inputs should not be focusable outside
* the sheet.
* Adding this class disables focus trapping
* for the sheet temporarily.
*/
baseEl.classList.add(FOCUS_TRAP_DISABLE_CLASS);
};
/**
* Toggles the visible modal footer when `expandToScroll` is disabled.
* @param footer The footer to show.
*/
const swapFooterVisibility = (footer) => {
const originalFooter = baseEl.querySelector('ion-footer');
if (!originalFooter) {
return;
}
const clonedFooter = wrapperEl.nextElementSibling;
const footerToHide = footer === 'original' ? clonedFooter : originalFooter;
const footerToShow = footer === 'original' ? originalFooter : clonedFooter;
footerToShow.style.removeProperty('display');
footerToShow.removeAttribute('aria-hidden');
const page = baseEl.querySelector('.ion-page');
if (footer === 'original') {
page.style.removeProperty('padding-bottom');
}
else {
const pagePadding = footerToShow.clientHeight;
page.style.setProperty('padding-bottom', `${pagePadding}px`);
}
footerToHide.style.setProperty('display', 'none');
footerToHide.setAttribute('aria-hidden', 'true');
};
/**
* After the entering animation completes,
* we need to set the animation to go from
* offset 0 to offset 1 so that users can
* swipe in any direction. We then set the
* animation offset to the current breakpoint
* so there is no flickering.
*/
if (wrapperAnimation && backdropAnimation) {
wrapperAnimation.keyframes([...SheetDefaults.WRAPPER_KEYFRAMES]);
backdropAnimation.keyframes([...SheetDefaults.BACKDROP_KEYFRAMES]);
contentAnimation === null || contentAnimation === void 0 ? void 0 : contentAnimation.keyframes([...SheetDefaults.CONTENT_KEYFRAMES]);
animation.progressStart(true, 1 - currentBreakpoint);
/**
* If backdrop is not enabled, then content
* behind modal should be clickable. To do this, we need
* to remove pointer-events from ion-modal as a whole.
* ion-backdrop and .modal-wrapper always have pointer-events: auto
* applied, so the modal content can still be interacted with.
*/
const shouldEnableBackdrop = currentBreakpoint > backdropBreakpoint;
if (shouldEnableBackdrop) {
enableBackdrop();
}
else {
disableBackdrop();
}
}
if (contentEl && currentBreakpoint !== maxBreakpoint && expandToScroll) {
contentEl.scrollY = false;
}
const canStart = (detail) => {
/**
* If we are swiping on the content, swiping should only be possible if the content
* is scrolled all the way to the top so that we do not interfere with scrolling.
*
* We cannot assume that the `ion-content` target will remain consistent between swipes.
* For example, when using ion-nav within a modal it is possible to swipe, push a view,
* and then swipe again. The target content will not be the same between swipes.
*/
const contentEl = findClosestIonContent(detail.event.target);
currentBreakpoint = getCurrentBreakpoint();
/**
* If `expandToScroll` is disabled, we should not allow the swipe gesture
* to start if the content is not scrolled to the top.
*/
if (!expandToScroll && contentEl) {
const scrollEl = isIonContent(contentEl) ? getElementRoot(contentEl).querySelector('.inner-scroll') : contentEl;
return scrollEl.scrollTop === 0;
}
if (currentBreakpoint === 1 && contentEl) {
/**
* The modal should never swipe to close on the content with a refresher.
* Note 1: We cannot solve this by making this gesture have a higher priority than
* the refresher gesture as the iOS native refresh gesture uses a scroll listener in
* addition to a gesture.
*
* Note 2: Do not use getScrollElement here because we need this to be a synchronous
* operation, and getScrollElement is asynchronous.
*/
const scrollEl = isIonContent(contentEl) ? getElementRoot(contentEl).querySelector('.inner-scroll') : contentEl;
const hasRefresherInContent = !!contentEl.querySelector('ion-refresher');
return !hasRefresherInContent && scrollEl.scrollTop === 0;
}
return true;
};
const onStart = (detail) => {
/**
* If canDismiss is anything other than `true`
* then users should be able to swipe down
* until a threshold is hit. At that point,
* the card modal should not proceed any further.
*
* canDismiss is never fired via gesture if there is
* no 0 breakpoint. However, it can be fired if the user
* presses Esc or the hardware back button.
* TODO (FW-937)
* Remove undefined check
*/
canDismissBlocksGesture = baseEl.canDismiss !== undefined && baseEl.canDismiss !== true && minBreakpoint === 0;
/**
* Cache the scroll element reference when the gesture starts,
* this allows us to avoid querying the DOM for the target in onMove,
* which would impact performance significantly.
*/
if (!expandToScroll) {
const targetEl = findClosestIonContent(detail.event.target);
cachedScrollEl =
targetEl && isIonContent(targetEl) ? getElementRoot(targetEl).querySelector('.inner-scroll') : targetEl;
}
/**
* If expandToScroll is disabled, we need to swap
* the footer visibility to the original, so if the modal
* is dismissed, the footer dismisses with the modal
* and doesn't stay on the screen after the modal is gone.
*/
if (!expandToScroll) {
swapFooterVisibility('original');
}
/**
* If we are pulling down, then it is possible we are pulling on the content.
* We do not want scrolling to happen at the same time as the gesture.
*/
if (detail.deltaY > 0 && contentEl) {
contentEl.scrollY = false;
}
raf(() => {
/**
* Dismisses the open keyboard when the sheet drag gesture is started.
* Sets the focus onto the modal element.
*/
baseEl.focus();
});
animation.progressStart(true, 1 - currentBreakpoint);
};
const onMove = (detail) => {
/**
* If `expandToScroll` is disabled, and an upwards swipe gesture is done within
* the scrollable content, we should not allow the swipe gesture to continue.
*/
if (!expandToScroll && detail.deltaY <= 0 && cachedScrollEl) {
return;
}
/**
* If we are pulling down, then it is possible we are pulling on the content.
* We do not want scrolling to happen at the same time as the gesture.
* This accounts for when the user scrolls down, scrolls all the way up, and then
* pulls down again such that the modal should start to move.
*/
if (detail.deltaY > 0 && contentEl) {
contentEl.scrollY = false;
}
/**
* Given the change in gesture position on the Y axis,
* compute where the offset of the animation should be
* relative to where the user dragged.
*/
const initialStep = 1 - currentBreakpoint;
const secondToLastBreakpoint = breakpoints.length > 1 ? 1 - breakpoints[1] : undefined;
const step = initialStep + detail.deltaY / height;
const isAttemptingDismissWithCanDismiss = secondToLastBreakpoint !== undefined && step >= secondToLastBreakpoint && canDismissBlocksGesture;
/**
* If we are blocking the gesture from dismissing,
* set the max step value so that the sheet cannot be
* completely hidden.
*/
const maxStep = isAttemptingDismissWithCanDismiss ? canDismissMaxStep : 0.9999;
/**
* If we are blocking the gesture from
* dismissing, calculate the spring modifier value
* this will be added to the starting breakpoint
* value to give the gesture a spring-like feeling.
* Note that when isAttemptingDismissWithCanDismiss is true,
* the modifier is always added to the breakpoint that
* appears right after the 0 breakpoint.
*
* Note that this modifier is essentially the progression
* between secondToLastBreakpoint and maxStep which is
* why we subtract secondToLastBreakpoint. This lets us get
* the result as a value from 0 to 1.
*/
const processedStep = isAttemptingDismissWithCanDismiss && secondToLastBreakpoint !== undefined
? secondToLastBreakpoint +
calculateSpringStep((step - secondToLastBreakpoint) / (maxStep - secondToLastBreakpoint))
: step;
offset = clamp(0.0001, processedStep, maxStep);
animation.progressStep(offset);
};
const onEnd = (detail) => {
/**
* If expandToScroll is disabled, we should not allow the moveSheetToBreakpoint
* function to be called if the user is trying to swipe content upwards and the content
* is not scrolled to the top.
*/
if (!expandToScroll && detail.deltaY <= 0 && cachedScrollEl && cachedScrollEl.scrollTop > 0) {
return;
}
/**
* When the gesture releases, we need to determine
* the closest breakpoint to snap to.
*/
const velocity = detail.velocityY;
const threshold = (detail.deltaY + velocity * 350) / height;
const diff = currentBreakpoint - threshold;
const closest = breakpoints.reduce((a, b) => {
return Math.abs(b - diff) < Math.abs(a - diff) ? b : a;
});
moveSheetToBreakpoint({
breakpoint: closest,
breakpointOffset: offset,
canDismiss: canDismissBlocksGesture,
/**
* The swipe is user-driven, so we should
* always animate when the gesture ends.
*/
animated: true,
});
};
const moveSheetToBreakpoint = (options) => {
const { breakpoint, canDismiss, breakpointOffset, animated } = options;
/**
* canDismiss should only prevent snapping
* when users are trying to dismiss. If canDismiss
* is present but the user is trying to swipe upwards,
* we should allow that to happen,
*/
const shouldPreventDismiss = canDismiss && breakpoint === 0;
const snapToBreakpoint = shouldPreventDismiss ? currentBreakpoint : breakpoint;
const shouldRemainOpen = snapToBreakpoint !== 0;
currentBreakpoint = 0;
/**
* Update the animation so that it plays from
* the last offset to the closest snap point.
*/
if (wrapperAnimation && backdropAnimation) {
wrapperAnimation.keyframes([
{ offset: 0, transform: `translateY(${breakpointOffset * 100}%)` },
{ offset: 1, transform: `translateY(${(1 - snapToBreakpoint) * 100}%)` },
]);
backdropAnimation.keyframes([
{
offset: 0,
opacity: `calc(var(--backdrop-opacity) * ${getBackdropValueForSheet(1 - breakpointOffset, backdropBreakpoint)})`,
},
{
offset: 1,
opacity: `calc(var(--backdrop-opacity) * ${getBackdropValueForSheet(snapToBreakpoint, backdropBreakpoint)})`,
},
]);
if (contentAnimation) {
/**
* The modal content should scroll at any breakpoint when expandToScroll
* is disabled. In order to do this, the content needs to be completely
* viewable so scrolling can access everything. Otherwise, the default
* behavior would show the content off the screen and only allow
* scrolling when the sheet is fully expanded.
*/
contentAnimation.keyframes([
{ offset: 0, maxHeight: `${(1 - breakpointOffset) * 100}%` },
{ offset: 1, maxHeight: `${snapToBreakpoint * 100}%` },
]);
}
animation.progressStep(0);
}
/**
* Gesture should remain disabled until the
* snapping animation completes.
*/
gesture.enable(false);
/**
* If expandToScroll is disabled, we need to swap
* the footer visibility to the cloned one so the footer
* doesn't flicker when the sheet's height is animated.
*/
if (!expandToScroll && shouldRemainOpen) {
swapFooterVisibility('cloned');
}
if (shouldPreventDismiss) {
handleCanDismiss(baseEl, animation);
}
else if (!shouldRemainOpen) {
onDismiss();
}
/**
* Enables scrolling immediately if the sheet is about to fully expand
* or if it allows scrolling at any breakpoint. Without this, there would
* be a ~500ms delay while the modal animation completes, causing a
* noticeable lag. Native iOS allows scrolling as soon as the gesture is
* released, so we align with that behavior.
*/
if (contentEl && (snapToBreakpoint === breakpoints[breakpoints.length - 1] || !expandToScroll)) {
contentEl.scrollY = true;
}
return new Promise((resolve) => {
animation
.onFinish(() => {
if (shouldRemainOpen) {
/**
* Once the snapping animation completes,
* we need to reset the animation to go
* from 0 to 1 so users can swipe in any direction.
* We then set the animation offset to the current
* breakpoint so that it starts at the snapped position.
*/
if (wrapperAnimation && backdropAnimation) {
raf(() => {
wrapperAnimation.keyframes([...SheetDefaults.WRAPPER_KEYFRAMES]);
backdropAnimation.keyframes([...SheetDefaults.BACKDROP_KEYFRAMES]);
contentAnimation === null || contentAnimation === void 0 ? void 0 : contentAnimation.keyframes([...SheetDefaults.CONTENT_KEYFRAMES]);
animation.progressStart(true, 1 - snapToBreakpoint);
currentBreakpoint = snapToBreakpoint;
onBreakpointChange(currentBreakpoint);
/**
* Backdrop should become enabled
* after the backdropBreakpoint value
*/
const shouldEnableBackdrop = currentBreakpoint > backdropBreakpoint;
if (shouldEnableBackdrop) {
enableBackdrop();
}
else {
disableBackdrop();
}
gesture.enable(true);
resolve();
});
}
else {
gesture.enable(true);
resolve();
}
}
else {
resolve();
}
/**
* This must be a one time callback
* otherwise a new callback will
* be added every time onEnd runs.
*/
}, { oneTimeCallback: true })
.progressEnd(1, 0, animated ? 500 : 0);
});
};
const gesture = createGesture({
el: wrapperEl,
gestureName: 'modalSheet',
gesturePriority: 40,
direction: 'y',
threshold: 10,
canStart,
onStart,
onMove,
onEnd,
});
return {
gesture,
moveSheetToBreakpoint,
};
};