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-rw-r--r--ext/mixed/js/display-context.js55
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diff --git a/ext/mixed/js/display-context.js b/ext/mixed/js/display-context.js
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+/*
+ * Copyright (C) 2019 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 DisplayContext {
+ constructor(type, definitions, context) {
+ this.type = type;
+ this.definitions = definitions;
+ this.context = context;
+ }
+
+ get(key) {
+ return this.context[key];
+ }
+
+ set(key, value) {
+ this.context[key] = value;
+ }
+
+ update(data) {
+ Object.assign(this.context, data);
+ }
+
+ get previous() {
+ return this.context.previous;
+ }
+
+ get next() {
+ return this.context.next;
+ }
+
+ static push(self, type, definitions, context) {
+ const newContext = new DisplayContext(type, definitions, context);
+ if (self !== null) {
+ newContext.update({previous: self});
+ self.update({next: newContext});
+ }
+ return newContext;
+ }
+}