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Hover: only update styles of changed elements (#8185)

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Jukka Kurkela 2020-12-17 22:18:02 +02:00 committed by GitHub
parent b55b361f97
commit b10d994017
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1 changed files with 7 additions and 6 deletions
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13
src/core/core.controller.js
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@ -994,15 +994,16 @@ class Chart {
const me = this;
const options = me.options || {};
const hoverOptions = options.hover;
const diff = (a, b) => a.filter(x => !b.some(y => x.datasetIndex === y.datasetIndex && x.index === y.index));
const deactivated = diff(lastActive, active);
const activated = diff(active, lastActive);
// Remove styling for last active (even if it may still be active)
if (lastActive.length) {
me.updateHoverStyle(lastActive, hoverOptions.mode, false);
if (deactivated.length) {
me.updateHoverStyle(deactivated, hoverOptions.mode, false);
}
// Built-in hover styling
if (active.length && hoverOptions.mode) {
me.updateHoverStyle(active, hoverOptions.mode, true);
if (activated.length && hoverOptions.mode) {
me.updateHoverStyle(activated, hoverOptions.mode, true);
}
}