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metadata.js
File metadata and controls
144 lines (136 loc) · 4.66 KB
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import $ from 'jquery';
function addMetadataFunctions(AblePlayer) {
AblePlayer.prototype.updateMeta = function (time) {
if (this.hasMeta) {
if (this.metaType === "text") {
this.$metaDiv.show();
this.showMeta(time || this.elapsed);
} else {
this.showMeta(time || this.elapsed);
}
}
};
AblePlayer.prototype.showMeta = function (now) {
var tempSelectors,
m,
thisMeta,
cues,
cueText,
cueLines,
i,
line,
showDuration,
focusTarget;
tempSelectors = [];
if (this.meta.length >= 1) {
cues = this.meta;
} else {
cues = [];
}
for (m = 0; m < cues.length; m++) {
if (cues[m].start <= now && cues[m].end > now) {
thisMeta = m;
break;
}
}
if (typeof thisMeta !== "undefined") {
if (this.currentMeta !== thisMeta) {
if (this.metaType === "text") {
// it's time to load the new metadata cue into the container div
this.$metaDiv.html(
this.flattenCueForMeta(cues[thisMeta]).replace(/\n/g, "<br>")
);
} else if (this.metaType === "selector") {
// it's time to show content referenced by the designated selector(s)
cueText = this.flattenCueForMeta(cues[thisMeta]);
cueLines = cueText.split("\n");
for (i = 0; i < cueLines.length; i++) {
line = cueLines[i].trim();
if (line.toLowerCase().trim() === "pause") {
// don't show big play button when pausing via metadata
this.hideBigPlayButton = true;
this.pauseMedia();
} else if (line.toLowerCase().substring(0, 6) == "focus:") {
focusTarget = line.substring(6).trim();
if ($(focusTarget).length) {
$(focusTarget).trigger('focus');
}
} else {
if ($(line).length) {
// selector exists
this.currentMeta = thisMeta;
showDuration = parseInt($(line).attr("data-duration"));
if (
typeof showDuration !== "undefined" &&
!isNaN(showDuration)
) {
$(line).show();
const delay = (ms) => new Promise(resolve => setTimeout(resolve, ms));
delay(showDuration).then(() => {
$(line).hide();
});
} else {
// no duration specified. Just show the element until end time specified in VTT file
$(line).show();
}
// add to array of visible selectors so it can be hidden at end time
this.visibleSelectors.push(line);
tempSelectors.push(line);
}
}
}
// now step through this.visibleSelectors and remove anything that's stale
if (this.visibleSelectors && this.visibleSelectors.length) {
if (this.visibleSelectors.length !== tempSelectors.length) {
for (i = this.visibleSelectors.length - 1; i >= 0; i--) {
if ($.inArray(this.visibleSelectors[i], tempSelectors) == -1) {
$(this.visibleSelectors[i]).hide();
this.visibleSelectors.splice(i, 1);
}
}
}
}
}
}
} else {
// there is currently no metadata. Empty stale content
if (typeof this.$metaDiv !== "undefined") {
this.$metaDiv.html("");
}
if (this.visibleSelectors && this.visibleSelectors.length) {
for (i = 0; i < this.visibleSelectors.length; i++) {
$(this.visibleSelectors[i]).hide();
}
// reset array
this.visibleSelectors = [];
}
this.currentMeta = -1;
}
};
// Takes a cue and returns the metadata text to display for it.
AblePlayer.prototype.flattenCueForMeta = function (cue) {
var result = [];
var flattenComponent = function (component) {
var result = [],
ii;
if (component.type === "string") {
result.push(component.value);
} else if (component.type === "v") {
result.push("[" + component.value + "]");
for (ii = 0; ii < component.children.length; ii++) {
result.push(flattenComponent(component.children[ii]));
}
} else {
for (ii = 0; ii < component.children.length; ii++) {
result.push(flattenComponent(component.children[ii]));
}
}
return result.join("");
};
for (var ii = 0; ii < cue.components.children.length; ii++) {
result.push(flattenComponent(cue.components.children[ii]));
}
return result.join("");
};
}
export default addMetadataFunctions;