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Code Issues Releases Wiki Activity

Debounce scrollable widget scroll handler

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This commit is contained in:
Jeremy Ruston 2023-11-29 14:45:34 +00:00
parent 6b47cbed32
commit c61c34e9df
1 changed files with 15 additions and 8 deletions
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23
core/modules/widgets/scrollable.js
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@ -176,16 +176,23 @@ ScrollableWidget.prototype.render = function(parent,nextSibling) {
// After a delay for rendering, scroll to the bound position // After a delay for rendering, scroll to the bound position
setTimeout(this.updateScrollPositionFromBoundTiddler.bind(this),50); setTimeout(this.updateScrollPositionFromBoundTiddler.bind(this),50);
// Save scroll position on DOM scroll event // Save scroll position on DOM scroll event
var timeout;
this.outerDomNode.addEventListener("scroll",function(event) { this.outerDomNode.addEventListener("scroll",function(event) {
var existingTiddler = self.wiki.getTiddler(self.scrollableBind), if(timeout) {
newTiddlerFields = { window.cancelAnimationFrame(timeout);
title: self.scrollableBind, timeout = null;
"scroll-left": self.outerDomNode.scrollLeft.toString(),
"scroll-top": self.outerDomNode.scrollTop.toString()
};
if(!existingTiddler || (existingTiddler.fields["title"] !== newTiddlerFields["title"]) || (existingTiddler.fields["scroll-left"] !== newTiddlerFields["scroll-left"] || existingTiddler.fields["scroll-top"] !== newTiddlerFields["scroll-top"])) {
self.wiki.addTiddler(new $tw.Tiddler(existingTiddler,newTiddlerFields));
} }
timeout = window.requestAnimationFrame(function() {
var existingTiddler = self.wiki.getTiddler(self.scrollableBind),
newTiddlerFields = {
title: self.scrollableBind,
"scroll-left": self.outerDomNode.scrollLeft.toString(),
"scroll-top": self.outerDomNode.scrollTop.toString()
};
if(!existingTiddler || (existingTiddler.fields["title"] !== newTiddlerFields["title"]) || (existingTiddler.fields["scroll-left"] !== newTiddlerFields["scroll-left"] || existingTiddler.fields["scroll-top"] !== newTiddlerFields["scroll-top"])) {
self.wiki.addTiddler(new $tw.Tiddler(existingTiddler,newTiddlerFields));
}
});
}); });
} }
}; };