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show hints for elements in viewport

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This commit is contained in:
Shin'ya Ueoka 2017-09-17 19:48:49 +09:00
parent 324cf32c5b
commit 1880df95f6
1 changed files with 13 additions and 1 deletions
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14
src/content/follow.js
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@ -124,13 +124,25 @@ export default class Follow {
return chars;
}
static inWindow(window, element) {
let {
top, left, bottom, right
} = element.getBoundingClientRect();
return (
top >= 0 && left >= 0 &&
bottom <= (window.innerHeight || document.documentElement.clientHeight) &&
right <= (window.innerWidth || document.documentElement.clientWidth)
);
}
static getTargetElements(doc) {
let all = doc.querySelectorAll('a,button,input,textarea');
let filtered = Array.prototype.filter.call(all, (element) => {
let style = window.getComputedStyle(element);
return style.display !== 'none' &&
style.visibility !== 'hidden' &&
element.type !== 'hidden';
element.type !== 'hidden' &&
Follow.inWindow(window, element);
});
return filtered;
}