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-rw-r--r--ext/fg/js/source.js25
1 files changed, 25 insertions, 0 deletions
diff --git a/ext/fg/js/source.js b/ext/fg/js/source.js
index a360b331..a5421934 100644
--- a/ext/fg/js/source.js
+++ b/ext/fg/js/source.js
@@ -61,6 +61,10 @@ class TextSourceRange {
return this.range.getBoundingClientRect();
}
+ getWritingMode() {
+ return TextSourceRange.getElementWritingMode(TextSourceRange.getParentElement(this.range.startContainer));
+ }
+
getPaddedRect() {
const range = this.range.cloneRange();
const startOffset = range.startOffset;
@@ -204,6 +208,23 @@ class TextSourceRange {
return state.remainder > 0;
}
+
+ static getParentElement(node) {
+ while (node !== null && node.nodeType !== Node.ELEMENT_NODE) {
+ node = node.parentNode;
+ }
+ return node;
+ }
+
+ static getElementWritingMode(element) {
+ if (element === null) {
+ return 'horizontal-tb';
+ }
+
+ const style = window.getComputedStyle(element);
+ const writingMode = style.writingMode;
+ return typeof writingMode === 'string' ? writingMode : 'horizontal-tb';
+ }
}
@@ -267,6 +288,10 @@ class TextSourceElement {
return this.element.getBoundingClientRect();
}
+ getWritingMode() {
+ return 'horizontal-tb';
+ }
+
select() {
// NOP
}