0.2.5 initial commit

Makefile incomplete

ui/src/app/guards/deactivate.guard.ts

@@ -0,0 +1,26 @@
+import { Injectable, Directive } from '@angular/core'
+import { CanDeactivate } from '@angular/router'
+import { HostListener } from '@angular/core'
+
+@Directive()
+export abstract class PageCanDeactivate {
+  abstract canDeactivate (): boolean
+
+  @HostListener('window:beforeunload', ['$event'])
+  unloadNotification (e: any) {
+    console.log(e)
+    if (!this.canDeactivate()) {
+      e.returnValue = true
+    }
+  }
+}
+
+@Injectable({
+  providedIn: 'root',
+})
+export class CanDeactivateGuard implements CanDeactivate<PageCanDeactivate> {
+
+  canDeactivate (page: PageCanDeactivate): boolean {
+    return page.canDeactivate() || confirm('You have unsaved changes. Are you sure you want to leave the page?')
+  }
+}