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Remove *unconditional* browser sniffing in web/grab_to_pan.js

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According to https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/buttons#browser_compatibility, and manual testing in an up-to-date version of Google Chrome, the *unconditional* browser sniffing in `web/grab_to_pan.js` is no longer necessary.
In particular, this code is definitely not necessary in MOZCENTRAL-builds.
This commit is contained in:
Jonas Jenwald 2021-03-25 15:51:57 +01:00
parent 3c3cbe78ae
commit 34184a89f9
1 changed files with 18 additions and 14 deletions
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32
web/grab_to_pan.js
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@ -192,15 +192,6 @@ let matchesSelector;
return matchesSelector; // If found, then truthy, and [].some() ends.
});
// Browser sniffing because it's impossible to feature-detect
// whether event.which for onmousemove is reliable
const chrome = window.chrome;
const isChrome15OrOpera15plus = chrome && (chrome.webstore || chrome.app);
// ^ Chrome 15+ ^ Opera 15+
const isSafari6plus =
/Apple/.test(navigator.vendor) &&
/Version\/([6-9]\d*|[1-5]\d+)/.test(navigator.userAgent);
/**
* Whether the left mouse is not pressed.
* @param event {MouseEvent}
@ -211,13 +202,26 @@ function isLeftMouseReleased(event) {
if ("buttons" in event) {
// http://www.w3.org/TR/DOM-Level-3-Events/#events-MouseEvent-buttons
// Firefox 15+
// Chrome 43+
// Safari 11.1+
return !(event.buttons & 1);
}
if (isChrome15OrOpera15plus || isSafari6plus) {
// Chrome 14+
// Opera 15+
// Safari 6.0+
return event.which === 0;
if (typeof PDFJSDev === "undefined" || !PDFJSDev.test("MOZCENTRAL")) {
// Browser sniffing because it's impossible to feature-detect
// whether event.which for onmousemove is reliable.
const chrome = window.chrome;
const isChrome15OrOpera15plus = chrome && (chrome.webstore || chrome.app);
// ^ Chrome 15+ ^ Opera 15+
const isSafari6plus =
/Apple/.test(navigator.vendor) &&
/Version\/([6-9]\d*|[1-5]\d+)/.test(navigator.userAgent);
if (isChrome15OrOpera15plus || isSafari6plus) {
// Chrome 14+
// Opera 15+
// Safari 6.0+
return event.which === 0;
}
}
return false;
}