1 files changed, 0 insertions, 110 deletions
diff --git a/ext/mixed/js/document-focus-controller.js b/ext/mixed/js/document-focus-controller.js
deleted file mode 100644
index 649b5abe..00000000
--- a/ext/mixed/js/document-focus-controller.js
+++ /dev/null
@@ -1,110 +0,0 @@
-/*
- * Copyright (C) 2020-2021  Yomichan Authors
- *
- * 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 <https://www.gnu.org/licenses/>.
- */
-
-/**
- * This class is used to control the document focus when a non-body element contains the main scrollbar.
- * Web browsers will not automatically focus a custom element with the scrollbar on load, which results in
- * keyboard shortcuts (e.g. arrow keys) not controlling page scroll. Instead, this class will manually
- * focus a dummy element inside the main content, which gives keyboard scroll focus to that element.
- */
-class DocumentFocusController {
-    constructor() {
-        this._contentScrollFocusElement = document.querySelector('#content-scroll-focus');
-    }
-
-    prepare() {
-        window.addEventListener('focus', this._onWindowFocus.bind(this), false);
-        this._updateFocusedElement(false);
-    }
-
-    blurElement(element) {
-        if (document.activeElement !== element) { return; }
-        element.blur();
-        this._updateFocusedElement(false);
-    }
-
-    // Private
-
-    _onWindowFocus() {
-        this._updateFocusedElement(false);
-    }
-
-    _updateFocusedElement(force) {
-        const target = this._contentScrollFocusElement;
-        if (target === null) { return; }
-
-        const {activeElement} = document;
-        if (
-            force ||
-            activeElement === null ||
-            activeElement === document.documentElement ||
-            activeElement === document.body
-        ) {
-            // Get selection
-            const selection = window.getSelection();
-            const selectionRanges1 = this._getSelectionRanges(selection);
-
-            // Note: This function will cause any selected text to be deselected on Firefox.
-            target.focus({preventScroll: true});
-
-            // Restore selection
-            const selectionRanges2 = this._getSelectionRanges(selection);
-            if (!this._areRangesSame(selectionRanges1, selectionRanges2)) {
-                this._setSelectionRanges(selection, selectionRanges1);
-            }
-        }
-    }
-
-    _getSelectionRanges(selection) {
-        const ranges = [];
-        for (let i = 0, ii = selection.rangeCount; i < ii; ++i) {
-            ranges.push(selection.getRangeAt(i));
-        }
-        return ranges;
-    }
-
-    _setSelectionRanges(selection, ranges) {
-        selection.removeAllRanges();
-        for (const range of ranges) {
-            selection.addRange(range);
-        }
-    }
-
-    _areRangesSame(ranges1, ranges2) {
-        const ii = ranges1.length;
-        if (ii !== ranges2.length) {
-            return false;
-        }
-
-        for (let i = 0; i < ii; ++i) {
-            const range1 = ranges1[i];
-            const range2 = ranges2[i];
-            try {
-                if (
-                    range1.compareBoundaryPoints(Range.START_TO_START, range2) !== 0 ||
-                    range1.compareBoundaryPoints(Range.END_TO_END, range2) !== 0
-                ) {
-                    return false;
-                }
-            } catch (e) {
-                return false;
-            }
-        }
-
-        return true;
-    }
-}