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-rw-r--r--ext/mixed/js/display-history.js178
1 files changed, 0 insertions, 178 deletions
diff --git a/ext/mixed/js/display-history.js b/ext/mixed/js/display-history.js
deleted file mode 100644
index a6335521..00000000
--- a/ext/mixed/js/display-history.js
+++ /dev/null
@@ -1,178 +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/>.
- */
-
-class DisplayHistory extends EventDispatcher {
- constructor({clearable=true, useBrowserHistory=false}) {
- super();
- this._clearable = clearable;
- this._useBrowserHistory = useBrowserHistory;
- this._historyMap = new Map();
-
- const historyState = history.state;
- const {id, state} = isObject(historyState) ? historyState : {id: null, state: null};
- this._current = this._createHistoryEntry(id, location.href, state, null, null);
- }
-
- get state() {
- return this._current.state;
- }
-
- get content() {
- return this._current.content;
- }
-
- get useBrowserHistory() {
- return this._useBrowserHistory;
- }
-
- set useBrowserHistory(value) {
- this._useBrowserHistory = value;
- }
-
- prepare() {
- window.addEventListener('popstate', this._onPopState.bind(this), false);
- }
-
- hasNext() {
- return this._current.next !== null;
- }
-
- hasPrevious() {
- return this._current.previous !== null;
- }
-
- clear() {
- if (!this._clearable) { return; }
- this._clear();
- }
-
- back() {
- return this._go(false);
- }
-
- forward() {
- return this._go(true);
- }
-
- pushState(state, content, url) {
- if (typeof url === 'undefined') { url = location.href; }
-
- const entry = this._createHistoryEntry(null, url, state, content, this._current);
- this._current.next = entry;
- this._current = entry;
- this._updateHistoryFromCurrent(!this._useBrowserHistory);
- }
-
- replaceState(state, content, url) {
- if (typeof url === 'undefined') { url = location.href; }
-
- this._current.url = url;
- this._current.state = state;
- this._current.content = content;
- this._updateHistoryFromCurrent(true);
- }
-
- _onPopState() {
- this._updateStateFromHistory();
- this._triggerStateChanged(false);
- }
-
- _go(forward) {
- const target = forward ? this._current.next : this._current.previous;
- if (target === null) {
- return false;
- }
-
- if (this._useBrowserHistory) {
- if (forward) {
- history.forward();
- } else {
- history.back();
- }
- } else {
- this._current = target;
- this._updateHistoryFromCurrent(true);
- }
-
- return true;
- }
-
- _triggerStateChanged(synthetic) {
- this.trigger('stateChanged', {history: this, synthetic});
- }
-
- _updateHistoryFromCurrent(replace) {
- const {id, state, url} = this._current;
- if (replace) {
- history.replaceState({id, state}, '', url);
- } else {
- history.pushState({id, state}, '', url);
- }
- this._triggerStateChanged(true);
- }
-
- _updateStateFromHistory() {
- let state = history.state;
- let id = null;
- if (isObject(state)) {
- id = state.id;
- if (typeof id === 'string') {
- const entry = this._historyMap.get(id);
- if (typeof entry !== 'undefined') {
- // Valid
- this._current = entry;
- return;
- }
- }
- // Partial state recovery
- state = state.state;
- } else {
- state = null;
- }
-
- // Fallback
- this._current.id = (typeof id === 'string' ? id : this._generateId());
- this._current.state = state;
- this._current.content = null;
- this._clear();
- }
-
- _createHistoryEntry(id, url, state, content, previous) {
- if (typeof id !== 'string') { id = this._generateId(); }
- const entry = {
- id,
- url,
- next: null,
- previous,
- state,
- content
- };
- this._historyMap.set(id, entry);
- return entry;
- }
-
- _generateId() {
- return generateId(16);
- }
-
- _clear() {
- this._historyMap.clear();
- this._historyMap.set(this._current.id, this._current);
- this._current.next = null;
- this._current.previous = null;
- }
-}