1 files changed, 87 insertions, 0 deletions
diff --git a/extensions/46/middleclickclose/src/settingsWatch.js b/extensions/46/middleclickclose/src/settingsWatch.js
new file mode 100644
index 0000000..fd8b8bd
--- /dev/null
+++ b/extensions/46/middleclickclose/src/settingsWatch.js
@@ -0,0 +1,87 @@
+export class SettingsWatch {
+    #settings;
+    #key_data = new Map();
+
+    constructor(settings, ...opts) {
+        this.#settings = settings;
+
+        for (const opt of opts) {
+            if (typeof opt == 'string') {
+                this.#addSetting(opt, {});
+            } else {
+                for (const [prop_name, opts] of Object.entries(opt)) {
+                    this.#addSetting(prop_name, opts)
+                }
+            }
+        }
+    }
+
+    #addSetting(prop_name, opts) {
+        let key;
+        if (typeof opts == 'string') {
+            key = opts;
+            opts = {};
+        } else {
+            key = opts.key ?? prop_name.replace('_', '-');
+        }
+
+        const settings = this.#settings;
+        const raw_getter = opts.get_raw ?? this.#defaultRawGetter(settings, key);
+        const getter = opts.get ?? (x => x);
+
+        const update_cb = () => {
+            let value = getter(raw_getter(settings.get_value(key)));
+            this.#key_data.get(prop_name).value = value;
+
+            return value;
+        };
+
+        this.#key_data.set(prop_name, {});
+        Object.defineProperty(this, prop_name, {
+            enumerable: true,
+            configurable: true,
+            get() {
+                let data = this.#key_data.get(prop_name);
+                if (data.value === undefined) {
+                    data.handler_id = settings.connect('changed::' + key, update_cb);
+                    data.value = update_cb();
+                }
+
+                return data.value;
+            }
+        });
+    }
+
+    #defaultRawGetter(settings, key) {
+        const schema = settings.settings_schema.get_key(key);
+        const [range_ty, _range] = schema.get_range().recursiveUnpack();
+
+        if (range_ty == "enum") {
+            return value => {
+                return {
+                    nick: value.unpack(),
+
+                    // FIXME: remove unnecessary lookup if/when g_settings_schema_key_to_enum()
+                    // becomes available. But for now, an extra lookup will have to do.
+                    value: settings.get_enum(key),
+                };
+            };
+        }
+
+        return value => value.recursiveUnpack();
+    }
+
+    clear() {
+        for (const [key, data] of this.#key_data.entries()) {
+            if (data.handler_id !== undefined)
+                this.#settings.disconnect(data.handler_id);
+
+            delete this[key];
+        }
+
+        this.#key_data.clear();
+    }
+}
+
+// Allow calling clear as a static function.
+SettingsWatch.clear = obj => SettingsWatch.prototype.clear.apply(obj);