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-rw-r--r--ext/fg/js/range.js60
1 files changed, 60 insertions, 0 deletions
diff --git a/ext/fg/js/range.js b/ext/fg/js/range.js
new file mode 100644
index 00000000..819bbfd8
--- /dev/null
+++ b/ext/fg/js/range.js
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2016 Alex Yatskov <alex@foosoft.net>
+ * Author: Alex Yatskov <alex@foosoft.net>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+class Range {
+ constructor(range) {
+ this.range = range;
+ }
+
+ text() {
+ return this.range.toString();
+ }
+
+ setLength(length) {
+ const node = this.range.startContainer;
+ const offset = this.range.startOffset;
+
+ length = Math.min(node.length - offset, length);
+ if (length === 0) {
+ return null;
+ }
+
+ range.setEnd(node, offset + length);
+ return length;
+ }
+
+ paddedRect() {
+ const node = this.range.startContainer;
+ const startOffset = this.range.startOffset;
+ const endOffset = this.range.endOffset;
+
+ this.range.setStart(node, Math.max(0, startOffset - 1));
+ this.range.setEnd(node, Math.min(node.length, endOffset + 1));
+ const rect = range.getBoundingClientRect();
+ this.range.setStart(node, startOffset);
+ this.range.setEnd(node, endOffset);
+
+ return rect;
+ }
+
+ static fromPoint(point) {
+ const range = document.caretRangeFromPoint(point.x, point.y);
+ return range === null ? null : new Range(range);
+ }
+}