1 files changed, 188 insertions, 0 deletions

diff --git a/src/State/BooleanState.js b/src/State/BooleanState.js
new file mode 100644
index 0000000..3181fff
--- /dev/null
+++ b/src/State/BooleanState.js
@@ -0,0 +1,188 @@
+export default class BooleanState {
+
+    get value() {
+        return this.get();
+    }
+
+    set value(value) {
+        this.set(value);
+    }
+
+    constructor(value) {
+        this._value = value === true;
+        this._true = {
+            promise: null,
+            resolve: null
+        };
+        this._false = {
+            promise: null,
+            resolve: null
+        };
+        this._change = {
+            promise: null,
+            resolve: null
+        };
+        this._onTrue = [];
+        this._onFalse = [];
+        this._onChange = [];
+    }
+
+    get() {
+        return this._value;
+    }
+
+    set(value) {
+        this._value = value === true;
+        this._notify();
+    }
+
+    /**
+     *
+     * @returns {Promise<boolean>}
+     */
+    async awaitTrue() {
+        if(this._value) {
+            return new Promise((resolve) => resolve(true));
+        }
+
+        if(this._true.promise === null) {
+            this._true.promise = new Promise((resolve) => {
+                this._true.resolve = resolve;
+            });
+        }
+
+        return this._true.promise;
+    }
+
+    /**
+     *
+     * @returns {Promise<boolean>}
+     */
+    async awaitFalse() {
+        if(!this._value) {
+            return new Promise((resolve) => resolve(false));
+        }
+
+        if(this._false.promise === null) {
+            this._false.promise = new Promise((resolve) => {
+                this._false.resolve = resolve;
+            });
+        }
+
+        return this._false.promise;
+    }
+
+    /**
+     *
+     * @returns {Promise<boolean>}
+     */
+    async awaitChange() {
+        if(this._change.promise === null) {
+            this._change.promise = new Promise((resolve) => {
+                this._change.resolve = resolve;
+            });
+        }
+
+        return this._change.promise;
+    }
+
+    /**
+     *
+     * @param {Function} callback
+     */
+    onTrue(callback) {
+        this._onTrue.push(callback);
+    }
+
+    /**
+     *
+     * @param {Function} callback
+     */
+    offTrue(callback) {
+        this._off('_onTrue', callback);
+    }
+
+    /**
+     *
+     * @param {Function} callback
+     */
+    onFalse(callback) {
+        this._onFalse.push(callback);
+    }
+
+    /**
+     *
+     * @param {Function} callback
+     */
+    offFalse(callback) {
+        this._off('_onFalse', callback);
+    }
+
+    /**
+     *
+     * @param {Function} callback
+     */
+    onChange(callback) {
+        this._onChange.push(callback);
+    }
+
+    /**
+     *
+     * @param {Function} callback
+     */
+    offChange(callback) {
+        this._off('_onChange', callback);
+    }
+
+    /**
+     *
+     * @returns {Boolean}
+     */
+    toJSON() {
+        return this._value;
+    }
+
+    /**
+     *
+     * @private
+     */
+    _notify() {
+        if(this._value) {
+            if(this._true.promise !== null) this._true.resolve(this);
+            this._true.promise = null;
+            this._notifyEvents('_onTrue');
+        } else {
+            if(this._false.promise !== null) this._false.resolve(this);
+            this._false.promise = null;
+            this._notifyEvents('_onFalse');
+        }
+
+        if(this._change.promise !== null) this._change.resolve(this, this._value);
+        this._change.promise = null;
+        this._notifyEvents('_onChange');
+    }
+
+    /**
+     *
+     * @param {String} event
+     * @private
+     */
+    _notifyEvents(event) {
+        for(let callback of this[event]) {
+            callback(this, this._value);
+        }
+    }
+
+    /**
+     *
+     * @param {String} event
+     * @param {Function} callback
+     * @private
+     */
+    _off(event, callback) {
+        let index = this[event].indexOf(callback);
+        if(index !== -1) {
+            this[event].splice(index, 1);
+        }
+    }
+}
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