@huluvu424242/honey-slideshow
Version:
Text to Speech component wich is reading texts from DOM elements.
267 lines (266 loc) • 12.8 kB
JavaScript
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __generator = (this && this.__generator) || function (thisArg, body) {
var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
function verb(n) { return function (v) { return step([n, v]); }; }
function step(op) {
if (f) throw new TypeError("Generator is already executing.");
while (_) try {
if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
if (y = 0, t) op = [op[0] & 2, t.value];
switch (op[0]) {
case 0: case 1: t = op; break;
case 4: _.label++; return { value: op[1], done: false };
case 5: _.label++; y = op[1]; op = [0]; continue;
case 7: op = _.ops.pop(); _.trys.pop(); continue;
default:
if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
if (t[2]) _.ops.pop();
_.trys.pop(); continue;
}
op = body.call(thisArg, _);
} catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
}
};
import { r as registerInstance, c as createEvent, j as writeTask, i as readTask, h, g as getElement, H as Host } from './index-a2883912.js';
import { g as getIonMode } from './ionic-global-c170bb31.js';
var infiniteScrollCss = "ion-infinite-scroll{display:none;width:100%}.infinite-scroll-enabled{display:block}";
var InfiniteScroll = /** @class */ (function () {
function class_1(hostRef) {
var _this = this;
registerInstance(this, hostRef);
this.ionInfinite = createEvent(this, "ionInfinite", 7);
this.thrPx = 0;
this.thrPc = 0;
this.didFire = false;
this.isBusy = false;
this.isLoading = false;
/**
* The threshold distance from the bottom
* of the content to call the `infinite` output event when scrolled.
* The threshold value can be either a percent, or
* in pixels. For example, use the value of `10%` for the `infinite`
* output event to get called when the user has scrolled 10%
* from the bottom of the page. Use the value `100px` when the
* scroll is within 100 pixels from the bottom of the page.
*/
this.threshold = '15%';
/**
* If `true`, the infinite scroll will be hidden and scroll event listeners
* will be removed.
*
* Set this to true to disable the infinite scroll from actively
* trying to receive new data while scrolling. This is useful
* when it is known that there is no more data that can be added, and
* the infinite scroll is no longer needed.
*/
this.disabled = false;
/**
* The position of the infinite scroll element.
* The value can be either `top` or `bottom`.
*/
this.position = 'bottom';
this.onScroll = function () {
var scrollEl = _this.scrollEl;
if (!scrollEl || !_this.canStart()) {
return 1;
}
var infiniteHeight = _this.el.offsetHeight;
if (infiniteHeight === 0) {
// if there is no height of this element then do nothing
return 2;
}
var scrollTop = scrollEl.scrollTop;
var scrollHeight = scrollEl.scrollHeight;
var height = scrollEl.offsetHeight;
var threshold = _this.thrPc !== 0 ? (height * _this.thrPc) : _this.thrPx;
var distanceFromInfinite = (_this.position === 'bottom')
? scrollHeight - infiniteHeight - scrollTop - threshold - height
: scrollTop - infiniteHeight - threshold;
if (distanceFromInfinite < 0) {
if (!_this.didFire) {
_this.isLoading = true;
_this.didFire = true;
_this.ionInfinite.emit();
return 3;
}
}
else {
_this.didFire = false;
}
return 4;
};
}
class_1.prototype.thresholdChanged = function () {
var val = this.threshold;
if (val.lastIndexOf('%') > -1) {
this.thrPx = 0;
this.thrPc = (parseFloat(val) / 100);
}
else {
this.thrPx = parseFloat(val);
this.thrPc = 0;
}
};
class_1.prototype.disabledChanged = function () {
var disabled = this.disabled;
if (disabled) {
this.isLoading = false;
this.isBusy = false;
}
this.enableScrollEvents(!disabled);
};
class_1.prototype.connectedCallback = function () {
return __awaiter(this, void 0, void 0, function () {
var contentEl, _a;
var _this = this;
return __generator(this, function (_b) {
switch (_b.label) {
case 0:
contentEl = this.el.closest('ion-content');
if (!contentEl) {
console.error('<ion-infinite-scroll> must be used inside an <ion-content>');
return [2 /*return*/];
}
_a = this;
return [4 /*yield*/, contentEl.getScrollElement()];
case 1:
_a.scrollEl = _b.sent();
this.thresholdChanged();
this.disabledChanged();
if (this.position === 'top') {
writeTask(function () {
if (_this.scrollEl) {
_this.scrollEl.scrollTop = _this.scrollEl.scrollHeight - _this.scrollEl.clientHeight;
}
});
}
return [2 /*return*/];
}
});
});
};
class_1.prototype.disconnectedCallback = function () {
this.enableScrollEvents(false);
this.scrollEl = undefined;
};
/**
* Call `complete()` within the `ionInfinite` output event handler when
* your async operation has completed. For example, the `loading`
* state is while the app is performing an asynchronous operation,
* such as receiving more data from an AJAX request to add more items
* to a data list. Once the data has been received and UI updated, you
* then call this method to signify that the loading has completed.
* This method will change the infinite scroll's state from `loading`
* to `enabled`.
*/
class_1.prototype.complete = function () {
return __awaiter(this, void 0, void 0, function () {
var scrollEl, prev_1;
var _this = this;
return __generator(this, function (_a) {
scrollEl = this.scrollEl;
if (!this.isLoading || !scrollEl) {
return [2 /*return*/];
}
this.isLoading = false;
if (this.position === 'top') {
/**
* New content is being added at the top, but the scrollTop position stays the same,
* which causes a scroll jump visually. This algorithm makes sure to prevent this.
* (Frame 1)
* - complete() is called, but the UI hasn't had time to update yet.
* - Save the current content dimensions.
* - Wait for the next frame using _dom.read, so the UI will be updated.
* (Frame 2)
* - Read the new content dimensions.
* - Calculate the height difference and the new scroll position.
* - Delay the scroll position change until other possible dom reads are done using _dom.write to be performant.
* (Still frame 2, if I'm correct)
* - Change the scroll position (= visually maintain the scroll position).
* - Change the state to re-enable the InfiniteScroll.
* - This should be after changing the scroll position, or it could
* cause the InfiniteScroll to be triggered again immediately.
* (Frame 3)
* Done.
*/
this.isBusy = true;
prev_1 = scrollEl.scrollHeight - scrollEl.scrollTop;
// ******** DOM READ ****************
requestAnimationFrame(function () {
readTask(function () {
// UI has updated, save the new content dimensions
var scrollHeight = scrollEl.scrollHeight;
// New content was added on top, so the scroll position should be changed immediately to prevent it from jumping around
var newScrollTop = scrollHeight - prev_1;
// ******** DOM WRITE ****************
requestAnimationFrame(function () {
writeTask(function () {
scrollEl.scrollTop = newScrollTop;
_this.isBusy = false;
});
});
});
});
}
return [2 /*return*/];
});
});
};
class_1.prototype.canStart = function () {
return (!this.disabled &&
!this.isBusy &&
!!this.scrollEl &&
!this.isLoading);
};
class_1.prototype.enableScrollEvents = function (shouldListen) {
if (this.scrollEl) {
if (shouldListen) {
this.scrollEl.addEventListener('scroll', this.onScroll);
}
else {
this.scrollEl.removeEventListener('scroll', this.onScroll);
}
}
};
class_1.prototype.render = function () {
var _a;
var mode = getIonMode(this);
var disabled = this.disabled;
return (h(Host, { class: (_a = {},
_a[mode] = true,
_a['infinite-scroll-loading'] = this.isLoading,
_a['infinite-scroll-enabled'] = !disabled,
_a) }));
};
Object.defineProperty(class_1.prototype, "el", {
get: function () { return getElement(this); },
enumerable: false,
configurable: true
});
Object.defineProperty(class_1, "watchers", {
get: function () {
return {
"threshold": ["thresholdChanged"],
"disabled": ["disabledChanged"]
};
},
enumerable: false,
configurable: true
});
return class_1;
}());
InfiniteScroll.style = infiniteScrollCss;
export { InfiniteScroll as ion_infinite_scroll };