reconstruct ccTUI, add Button component

src/lib/ccTUI/Signal.ts

@@ -0,0 +1,28 @@
+/**
+ * Signal and Slot system similar to Qt
+ * Allows components to communicate with each other
+ */
+export class Signal<T = void> {
+  private slots: ((data?: T) => void)[] = [];
+
+  connect(slot: (data?: T) => void): void {
+    this.slots.push(slot);
+  }
+
+  disconnect(slot: (data?: T) => void): void {
+    const index = this.slots.indexOf(slot);
+    if (index !== -1) {
+      this.slots.splice(index, 1);
+    }
+  }
+
+  emit(data?: T): void {
+    for (const slot of this.slots) {
+      try {
+        slot(data);
+      } catch (e) {
+        printError(e);
+      }
+    }
+  }
+}