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Added comments to the relevant sections.

This commit is contained in:
Ján Jockusch 2019-05-03 17:45:19 +02:00
parent 6a63e22a6d
commit a00a08cb8d
1 changed files with 15 additions and 0 deletions
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15
app/ui.js
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@ -1168,10 +1168,15 @@ const UI = {
* ------v------*/ * ------v------*/
toggleFullscreen() { toggleFullscreen() {
// Determine the document using fullscreen. This may either be
// just the "document", but if using the viewer in an iframe, you need
// to use the parent window's "document" instead.
let doc = document; let doc = document;
if (window.self !== window.top) { if (window.self !== window.top) {
doc = window.parent.document; doc = window.parent.document;
} }
// Check the fullscreen status using the correct document as
// a reference. The same document is then used to exit fullscreen.
if (doc.fullscreenElement || // alternative standard method if (doc.fullscreenElement || // alternative standard method
doc.mozFullScreenElement || // currently working methods doc.mozFullScreenElement || // currently working methods
doc.webkitFullscreenElement || doc.webkitFullscreenElement ||
@ -1186,8 +1191,16 @@ const UI = {
doc.msExitFullscreen(); doc.msExitFullscreen();
} }
} else { } else {
// To activate fullscreen, we need to find the correct document
// element, which is usually "document.documentElement". But when
// using the viewer in an iframe, this is actually the iframe
// element itself in the parent document.
let doc_el = document.documentElement; let doc_el = document.documentElement;
if (window.self !== window.top) { if (window.self !== window.top) {
// Seek out the correct iframe from the parent document.
// This will produce errors if the iframe does not come from
// the same origin, so it is advisable to put the viewer in
// iframes only if you are on the same server.
let iframes = window.parent.document let iframes = window.parent.document
.getElementsByTagName('iframe'); .getElementsByTagName('iframe');
for (let i in iframes) { for (let i in iframes) {
@ -1197,6 +1210,8 @@ const UI = {
} }
} }
} }
// Activate fullscreen. All except MS use the document element for
// this. The behaviour of body.msRequestFullscreen is untested.
if (doc_el.requestFullscreen) { if (doc_el.requestFullscreen) {
doc_el.requestFullscreen(); doc_el.requestFullscreen();
} else if (doc_el.mozRequestFullScreen) { } else if (doc_el.mozRequestFullScreen) {