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authortoasted-nutbread <toasted-nutbread@users.noreply.github.com>2019-08-10 13:33:00 -0400
committertoasted-nutbread <toasted-nutbread@users.noreply.github.com>2019-08-16 17:44:16 -0400
commit2edd4183a0f5061999af2a4e84bea87b6e70834b (patch)
treee9e5a8f521617d51048a1230488eb9ef7d6a53fb /ext/fg/js
parente23d4b9a82581f3cf1118e31d077fc9cdaff7573 (diff)
Clean up docRangeFromPoint
Use a cached value for checking if the browser is Firefox. Only validate and set up document.caretRangeFromPoint once. Use switch for multiple comparisons on the same value.
Diffstat (limited to 'ext/fg/js')
-rw-r--r--ext/fg/js/document.js74
1 files changed, 43 insertions, 31 deletions
diff --git a/ext/fg/js/document.js b/ext/fg/js/document.js
index f58a64fc..86396a8a 100644
--- a/ext/fg/js/document.js
+++ b/ext/fg/js/document.js
@@ -17,6 +17,8 @@
*/
+const IS_FIREFOX = /Firefox/.test(navigator.userAgent);
+
function docOffsetCalc(element) {
const scrollTop = window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop;
const scrollLeft = window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft;
@@ -69,43 +71,23 @@ function docRangeFromPoint(point) {
const element = document.elementFromPoint(point.x, point.y);
let imposter = null;
if (element) {
- if (element.nodeName === 'IMG' || element.nodeName === 'BUTTON') {
- return new TextSourceElement(element);
- } else if (element.nodeName === 'INPUT' || element.nodeName === 'TEXTAREA') {
- imposter = docImposterCreate(element);
+ switch (element.nodeName) {
+ case 'IMG':
+ case 'BUTTON':
+ return new TextSourceElement(element);
+ case 'INPUT':
+ case 'TEXTAREA':
+ imposter = docImposterCreate(element);
+ break;
}
}
- if (!document.caretRangeFromPoint) {
- document.caretRangeFromPoint = (x, y) => {
- const position = document.caretPositionFromPoint(x,y);
- if (position && position.offsetNode && position.offsetNode.nodeType === Node.TEXT_NODE) {
- const range = document.createRange();
- range.setStart(position.offsetNode, position.offset);
- range.setEnd(position.offsetNode, position.offset);
- return range;
- }
- return null;
- };
- }
-
const range = document.caretRangeFromPoint(point.x, point.y);
- if (range === null) {
- return;
+ if (imposter !== null) {
+ imposter.style.zIndex = -2147483646;
}
- if(imposter !== null) imposter.style.zIndex = -2147483646;
-
- const rects = range.getClientRects();
- for (const rect of rects) {
- if (point.y <= rect.bottom + 2) {
- return new TextSourceRange(range);
- }
- }
-
- if (navigator.userAgent.match(/Firefox/)) {
- return new TextSourceRange(range);
- }
+ return range !== null && isPointInRange(point, range) ? new TextSourceRange(range) : null;
}
function docSentenceExtract(source, extent) {
@@ -178,3 +160,33 @@ function docSentenceExtract(source, extent) {
offset: position - startPos - padding
};
}
+
+function isPointInRange(point, range) {
+ if (IS_FIREFOX) {
+ // Always return true on Firefox due to an issue where range.getClientRects()
+ // does not return a correct set of rects for characters at the beginning of a line.
+ return true;
+ }
+
+ const y = point.y - 2;
+ for (const rect of range.getClientRects()) {
+ if (y <= rect.bottom) {
+ return true;
+ }
+ }
+
+ return false;
+}
+
+if (typeof document.caretRangeFromPoint !== 'function') {
+ document.caretRangeFromPoint = (x, y) => {
+ const position = document.caretPositionFromPoint(x, y);
+ if (position && position.offsetNode && position.offsetNode.nodeType === Node.TEXT_NODE) {
+ const range = document.createRange();
+ range.setStart(position.offsetNode, position.offset);
+ range.setEnd(position.offsetNode, position.offset);
+ return range;
+ }
+ return null;
+ };
+}