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MOBILE-2428 core: Wait for imgs to load in format-text

main
Dani Palou 2018-06-19 09:22:52 +02:00
parent 0b6972cbd3
commit 2d23297af3
1 changed files with 134 additions and 45 deletions
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179
src/directives/format-text.ts
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@ -57,6 +57,7 @@ export class CoreFormatTextDirective implements OnChanges {
protected tagsToIgnore = ['AUDIO', 'VIDEO', 'BUTTON', 'INPUT', 'SELECT', 'TEXTAREA', 'A'];
protected element: HTMLElement;
protected clickListener;
constructor(element: ElementRef, private sitesProvider: CoreSitesProvider, private domUtils: CoreDomUtilsProvider,
private textUtils: CoreTextUtilsProvider, private translate: TranslateService, private platform: Platform,
@ -156,6 +157,80 @@ export class CoreFormatTextDirective implements OnChanges {
container.appendChild(anchor);
}
/**
* Calculate the height and check if we need to display show more or not.
*/
protected calculateHeight(): void {
// Height cannot be calculated if the element is not shown while calculating.
// Force shorten if it was previously shortened.
// @todo: Work on calculate this height better.
const height = this.element.style.maxHeight ? 0 : this.getElementHeight(this.element);
// If cannot calculate height, shorten always.
if (!height || height > this.maxHeight) {
if (!this.clickListener) {
this.displayShowMore();
}
} else if (this.clickListener) {
this.hideShowMore();
}
}
/**
* Display the "Show more" in the element.
*/
protected displayShowMore(): void {
const expandInFullview = this.utils.isTrueOrOne(this.fullOnClick) || false,
showMoreDiv = document.createElement('div');
showMoreDiv.classList.add('core-show-more');
showMoreDiv.innerHTML = this.translate.instant('core.showmore');
this.element.appendChild(showMoreDiv);
if (expandInFullview) {
this.element.classList.add('core-expand-in-fullview');
}
this.element.classList.add('core-text-formatted');
this.element.classList.add('core-shortened');
this.element.style.maxHeight = this.maxHeight + 'px';
this.clickListener = this.elementClicked.bind(this, expandInFullview);
this.element.addEventListener('click', this.clickListener);
}
/**
* Listener to call when the element is clicked.
*
* @param {boolean} expandInFullview Whether to expand the text in a new view.
* @param {MouseEvent} e Click event.
*/
protected elementClicked(expandInFullview: boolean, e: MouseEvent): void {
if (e.defaultPrevented) {
// Ignore it if the event was prevented by some other listener.
return;
}
e.preventDefault();
e.stopPropagation();
const target = <HTMLElement> e.target;
if (this.tagsToIgnore.indexOf(target.tagName) === -1 || (target.tagName === 'A' &&
!target.getAttribute('href'))) {
if (!expandInFullview) {
// Change class.
this.element.classList.toggle('core-shortened');
return;
}
}
// Open a new state with the contents.
this.textUtils.expandText(this.fullTitle || this.translate.instant('core.description'), this.text,
this.component, this.componentId);
}
/**
* Finish the rendering, displaying the element again and calling afterRender.
*/
@ -188,53 +263,15 @@ export class CoreFormatTextDirective implements OnChanges {
// Move the children to the current element to be able to calculate the height.
this.domUtils.moveChildren(div, this.element);
// Height cannot be calculated if the element is not shown while calculating.
// Force shorten if it was previously shortened.
// @todo: Work on calculate this height better.
const height = this.element.style.maxHeight ? 0 : this.getElementHeight(this.element);
// Calculate the height now.
this.calculateHeight();
// If cannot calculate height, shorten always.
if (!height || height > this.maxHeight) {
const expandInFullview = this.utils.isTrueOrOne(this.fullOnClick) || false,
showMoreDiv = document.createElement('div');
showMoreDiv.classList.add('core-show-more');
showMoreDiv.innerHTML = this.translate.instant('core.showmore');
this.element.appendChild(showMoreDiv);
if (expandInFullview) {
this.element.classList.add('core-expand-in-fullview');
// Wait for images to load and calculate the height again if needed.
this.waitForImages().then((hasImgToLoad) => {
if (hasImgToLoad) {
this.calculateHeight();
}
this.element.classList.add('core-text-formatted');
this.element.classList.add('core-shortened');
this.element.style.maxHeight = this.maxHeight + 'px';
this.element.addEventListener('click', (e) => {
if (e.defaultPrevented) {
// Ignore it if the event was prevented by some other listener.
return;
}
e.preventDefault();
e.stopPropagation();
const target = <HTMLElement> e.target;
if (this.tagsToIgnore.indexOf(target.tagName) === -1 || (target.tagName === 'A' &&
!target.getAttribute('href'))) {
if (!expandInFullview) {
// Change class.
this.element.classList.toggle('core-shortened');
return;
}
}
// Open a new state with the contents.
this.textUtils.expandText(this.fullTitle || this.translate.instant('core.description'), this.text,
this.component, this.componentId);
});
}
});
} else {
this.domUtils.moveChildren(div, this.element);
}
@ -370,6 +407,25 @@ export class CoreFormatTextDirective implements OnChanges {
return this.domUtils.getElementHeight(element) || 0;
}
/**
* "Hide" the "Show more" in the element if it's shown.
*/
protected hideShowMore(): void {
const showMoreDiv = this.element.querySelector('div.core-show-more');
if (showMoreDiv) {
showMoreDiv.remove();
}
this.element.classList.remove('core-expand-in-fullview');
this.element.classList.remove('core-text-formatted');
this.element.classList.remove('core-shortened');
this.element.style.maxHeight = null;
this.element.removeEventListener('click', this.clickListener);
this.clickListener = null;
}
/**
* Treat video filters. Currently only treating youtube video using video JS.
*
@ -483,6 +539,39 @@ export class CoreFormatTextDirective implements OnChanges {
}
}
/**
* Wait for images to load.
*
* @return {Promise<boolean>} Promise resolved with a boolean: whether there was any image to load.
*/
protected waitForImages(): Promise<boolean> {
const imgs = Array.from(this.element.querySelectorAll('img')),
promises = [];
let hasImgToLoad = false;
imgs.forEach((img) => {
if (img && !img.complete) {
hasImgToLoad = true;
// Wait for image to load or fail.
promises.push(new Promise((resolve, reject): void => {
const imgLoaded = (): void => {
resolve();
img.removeEventListener('loaded', imgLoaded);
img.removeEventListener('error', imgLoaded);
};
img.addEventListener('load', imgLoaded);
img.addEventListener('error', imgLoaded);
}));
}
});
return Promise.all(promises).then(() => {
return hasImgToLoad;
});
}
/**
* Convenience function to extract YouTube Id to translate to embedded video.
* Based on http://stackoverflow.com/questions/3452546/javascript-regex-how-to-get-youtube-video-id-from-url