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Code Issues Releases Wiki Activity

DynaView: refactor checkVisibility for performance and readability

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This commit is contained in:
Jermolene 2018-05-23 14:17:49 +01:00
parent 01bdaff005
commit 4b42173962
1 changed files with 24 additions and 41 deletions
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65
plugins/tiddlywiki/dynaview/dynaview.js
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@ -137,41 +137,11 @@ function setZoomClasses() {
function checkVisibility() {
var elements = document.querySelectorAll(".tc-dynaview-set-tiddler-when-visible");
$tw.utils.each(elements,function(element) {
// Bail if we've already triggered this element
if(element.getAttribute("data-dynaview-has-triggered") === "true") {
if(element.getAttribute("data-dynaview-unset-tiddler") !== undefined && element.getAttribute("data-dynaview-unset-value") !== undefined) {
// Check if the element is visible
var elementRect = element.getBoundingClientRect(),
viewportWidth = window.innerWidth || document.documentElement.clientWidth,
viewportHeight = window.innerHeight || document.documentElement.clientHeight,
viewportRect = {
left: 0,
right: viewportWidth,
top: 0,
bottom: viewportHeight
};
if(element.classList.contains("tc-dynaview-expand-viewport")) {
viewportRect.left -= viewportWidth;
viewportRect.right += viewportWidth;
viewportRect.top -= viewportHeight;
viewportRect.bottom += viewportHeight;
}
if(elementRect.left > viewportRect.right ||
elementRect.right < viewportRect.left ||
elementRect.top > viewportRect.bottom ||
elementRect.bottom < viewportRect.top) {
// Set the tiddler value
var tiddler = element.getAttribute("data-dynaview-unset-tiddler"),
value = element.getAttribute("data-dynaview-unset-value") || "";
if(tiddler && $tw.wiki.getTiddlerText(tiddler) !== value) {
$tw.wiki.addTiddler(new $tw.Tiddler({title: tiddler, text: value}));
}
element.setAttribute("data-dynaview-has-triggered","false");
}
}
// Bail if we've already triggered this element and we're not unsetting a tiddler when this element leaves the viewport
if(element.getAttribute("data-dynaview-has-triggered") === "true" && !element.hasAttribute("data-dynaview-unset-tiddler")) {
return;
}
// Check if the element is visible
// Calculate whether the element is visible
var elementRect = element.getBoundingClientRect(),
viewportWidth = window.innerWidth || document.documentElement.clientWidth,
viewportHeight = window.innerHeight || document.documentElement.clientHeight,
@ -180,20 +150,33 @@ function checkVisibility() {
right: viewportWidth,
top: 0,
bottom: viewportHeight
};
},
tiddler,
value;
if(element.classList.contains("tc-dynaview-expand-viewport")) {
viewportRect.left -= viewportWidth;
viewportRect.right += viewportWidth;
viewportRect.top -= viewportHeight;
viewportRect.bottom += viewportHeight;
}
if(!(elementRect.left > viewportRect.right ||
elementRect.right < viewportRect.left ||
elementRect.top > viewportRect.bottom ||
elementRect.bottom < viewportRect.top)) {
// Set the tiddler value
var tiddler = element.getAttribute("data-dynaview-set-tiddler"),
value = element.getAttribute("data-dynaview-set-value") || "";
if(elementRect.left > viewportRect.right ||
elementRect.right < viewportRect.left ||
elementRect.top > viewportRect.bottom ||
elementRect.bottom < viewportRect.top) {
// Element is not visible
// Set the unset tiddler if required and this element has previously been triggered
if(element.getAttribute("data-dynaview-has-triggered") === "true" && element.hasAttribute("data-dynaview-unset-tiddler")) {
tiddler = element.getAttribute("data-dynaview-unset-tiddler");
value = element.getAttribute("data-dynaview-unset-value") || "";
if(tiddler && $tw.wiki.getTiddlerText(tiddler) !== value) {
$tw.wiki.addTiddler(new $tw.Tiddler({title: tiddler, text: value}));
}
element.setAttribute("data-dynaview-has-triggered","false");
}
} else {
// Element is visible
tiddler = element.getAttribute("data-dynaview-set-tiddler");
value = element.getAttribute("data-dynaview-set-value") || "";
if(tiddler && $tw.wiki.getTiddlerText(tiddler) !== value) {
$tw.wiki.addTiddler(new $tw.Tiddler({title: tiddler, text: value}));
}