Improve toast panel

@@ -25,5 +25,5 @@
           'info-toast': notification.type === 'info'
      }">
   <div class="toast-text" [innerHTML]="notification.message"></div>
-  <button #actionButton mat-button (click)="action()">{{ 'action.close' | translate }}</button>
+  <button #actionButton type="button" mat-button (click)="action()">{{ 'action.close' | translate }}</button>
 </div>

@@ -16,6 +16,33 @@
 :host {
   display: inline-block;
   pointer-events: all;
+  &.toast-panel {
+    position: absolute;
+    top: 0;
+    bottom: 0;
+    left: 0;
+    right: 0;
+    z-index: 1000;
+    display: flex;
+    &.left {
+      justify-content: flex-start;
+    }
+    &.right {
+      justify-content: flex-end;
+    }
+    &.top {
+      align-items: flex-start;
+    }
+    &.bottom {
+      align-items: flex-end;
+    }
+    &.h-center {
+      justify-content: center;
+    }
+    &.v-center {
+      align-items: center;
+    }
+  }
   .tb-toast {
     box-shadow: 0 3px 5px -1px rgba(0, 0, 0, 0.2), 0 6px 10px 0 rgba(0, 0, 0, 0.14), 0 1px 18px 0 rgba(0, 0, 0, 0.12);
     color: #fff;

@@ -16,9 +16,9 @@
 
 import {
   AfterViewInit, ChangeDetectorRef,
-  Component, ComponentRef,
+  Component, ComponentFactoryResolver, ComponentRef,
   Directive,
-  ElementRef,
+  ElementRef, HostBinding,
   Inject,
   Input,
   NgZone,
@@ -34,8 +34,7 @@ import { BreakpointObserver } from '@angular/cdk/layout';
 import { MediaBreakpoints } from '@shared/models/constants';
 import { MatButton } from '@angular/material/button';
 import Timeout = NodeJS.Timeout;
-import { ConnectedPosition, Overlay, OverlayConfig, OverlayRef } from '@angular/cdk/overlay';
-import { ComponentPortal, PortalInjector } from '@angular/cdk/portal';
+import { PortalInjector } from '@angular/cdk/portal';
 
 @Directive({
   selector: '[tb-toast]'
@@ -49,7 +48,6 @@ export class ToastDirective implements AfterViewInit, OnDestroy {
   private hideNotificationSubscription: Subscription = null;
 
   private snackBarRef: MatSnackBarRef<any> = null;
-  private overlayRef: OverlayRef;
   private toastComponentRef: ComponentRef<TbSnackBarComponent>;
   private currentMessage: NotificationMessage = null;
 
@@ -58,7 +56,7 @@ export class ToastDirective implements AfterViewInit, OnDestroy {
   constructor(private elementRef: ElementRef,
               private viewContainerRef: ViewContainerRef,
               private notificationService: NotificationService,
-              private overlay: Overlay,
+              private componentFactoryResolver: ComponentFactoryResolver,
               private snackBar: MatSnackBar,
               private ngZone: NgZone,
               private breakpointObserver: BreakpointObserver,
@@ -104,9 +102,11 @@ export class ToastDirective implements AfterViewInit, OnDestroy {
       if (this.snackBarRef) {
         this.snackBarRef.dismiss();
       }
-
-      const position = this.overlay.position();
-      let panelClass = ['tb-toast-panel'];
+      if (this.toastComponentRef) {
+        this.viewContainerRef.detach(0);
+        this.toastComponentRef.destroy();
+      }
+      let panelClass = ['tb-toast-panel', 'toast-panel'];
       if (notificationMessage.panelClass) {
         if (typeof notificationMessage.panelClass === 'string') {
           panelClass.push(notificationMessage.panelClass);
@@ -114,46 +114,35 @@ export class ToastDirective implements AfterViewInit, OnDestroy {
           panelClass = panelClass.concat(notificationMessage.panelClass);
         }
       }
-      const overlayConfig = new OverlayConfig({
-        panelClass,
-        backdropClass: 'cdk-overlay-transparent-backdrop',
-        hasBackdrop: false,
-        disposeOnNavigation: true
-      });
-      let originX;
-      let originY;
       const horizontalPosition = notificationMessage.horizontalPosition || 'left';
       const verticalPosition = notificationMessage.verticalPosition || 'top';
       if (horizontalPosition === 'start' || horizontalPosition === 'left') {
-        originX = 'start';
+        panelClass.push('left');
       } else if (horizontalPosition === 'end' || horizontalPosition === 'right') {
-        originX = 'end';
+        panelClass.push('right');
       } else {
-        originX = 'center';
+        panelClass.push('h-center');
       }
       if (verticalPosition === 'top') {
-        originY = 'top';
+        panelClass.push('top');
       } else {
-        originY = 'bottom';
+        panelClass.push('bottom');
       }
-      const connectedPosition: ConnectedPosition = {
-        originX,
-        originY,
-        overlayX: originX,
-        overlayY: originY
-      };
-      overlayConfig.positionStrategy = position.flexibleConnectedTo(this.elementRef)
-        .withPositions([connectedPosition]);
-      this.overlayRef = this.overlay.create(overlayConfig);
+
+      const componentFactory = this.componentFactoryResolver.resolveComponentFactory(TbSnackBarComponent);
       const data: ToastPanelData = {
-        notification: notificationMessage
+        notification: notificationMessage,
+        panelClass,
+        destroyToastComponent: () => {
+          this.viewContainerRef.detach(0);
+          this.toastComponentRef.destroy();
+        }
       };
       const injectionTokens = new WeakMap<any, any>([
-        [MAT_SNACK_BAR_DATA, data],
-        [OverlayRef, this.overlayRef]
+        [MAT_SNACK_BAR_DATA, data]
       ]);
       const injector = new PortalInjector(this.viewContainerRef.injector, injectionTokens);
-      this.toastComponentRef = this.overlayRef.attach(new ComponentPortal(TbSnackBarComponent, this.viewContainerRef, injector));
+      this.toastComponentRef = this.viewContainerRef.createComponent(componentFactory, 0, injector);
       this.cd.detectChanges();
 
       if (notificationMessage.duration && notificationMessage.duration > 0) {
@@ -173,7 +162,6 @@ export class ToastDirective implements AfterViewInit, OnDestroy {
           clearTimeout(this.dismissTimeout);
           this.dismissTimeout = null;
         }
-        this.overlayRef = null;
         this.toastComponentRef = null;
         this.currentMessage = null;
       });
@@ -181,43 +169,45 @@ export class ToastDirective implements AfterViewInit, OnDestroy {
   }
 
   private showSnackBar(notificationMessage: NotificationMessage, isGtSm: boolean) {
-    const data: ToastPanelData = {
-      notification: notificationMessage,
-      parent: this.elementRef
-    };
-    const config: MatSnackBarConfig = {
-      horizontalPosition: notificationMessage.horizontalPosition || 'left',
-      verticalPosition: !isGtSm ? 'bottom' : (notificationMessage.verticalPosition || 'top'),
-      viewContainerRef: this.viewContainerRef,
-      duration: notificationMessage.duration,
-      panelClass: notificationMessage.panelClass,
-      data
-    };
     this.ngZone.run(() => {
       if (this.snackBarRef) {
         this.snackBarRef.dismiss();
       }
+      const data: ToastPanelData = {
+        notification: notificationMessage,
+        parent: this.elementRef,
+        panelClass: [],
+        destroyToastComponent: () => {}
+      };
+      const config: MatSnackBarConfig = {
+        horizontalPosition: notificationMessage.horizontalPosition || 'left',
+        verticalPosition: !isGtSm ? 'bottom' : (notificationMessage.verticalPosition || 'top'),
+        viewContainerRef: this.viewContainerRef,
+        duration: notificationMessage.duration,
+        panelClass: notificationMessage.panelClass,
+        data
+      };
       this.snackBarRef = this.snackBar.openFromComponent(TbSnackBarComponent, config);
-    });
-    if (notificationMessage.duration && notificationMessage.duration > 0 && notificationMessage.forceDismiss) {
-      if (this.dismissTimeout !== null) {
-        clearTimeout(this.dismissTimeout);
-        this.dismissTimeout = null;
-      }
-      this.dismissTimeout = setTimeout(() => {
-        if (this.snackBarRef) {
-          this.snackBarRef.instance.actionButton._elementRef.nativeElement.click();
+      if (notificationMessage.duration && notificationMessage.duration > 0 && notificationMessage.forceDismiss) {
+        if (this.dismissTimeout !== null) {
+          clearTimeout(this.dismissTimeout);
+          this.dismissTimeout = null;
         }
-        this.dismissTimeout = null;
-      }, notificationMessage.duration);
-    }
-    this.snackBarRef.afterDismissed().subscribe(() => {
-      if (this.dismissTimeout !== null) {
-        clearTimeout(this.dismissTimeout);
-        this.dismissTimeout = null;
+        this.dismissTimeout = setTimeout(() => {
+          if (this.snackBarRef) {
+            this.snackBarRef.instance.actionButton._elementRef.nativeElement.click();
+          }
+          this.dismissTimeout = null;
+        }, notificationMessage.duration);
       }
-      this.snackBarRef = null;
-      this.currentMessage = null;
+      this.snackBarRef.afterDismissed().subscribe(() => {
+        if (this.dismissTimeout !== null) {
+          clearTimeout(this.dismissTimeout);
+          this.dismissTimeout = null;
+        }
+        this.snackBarRef = null;
+        this.currentMessage = null;
+      });
     });
   }
 
@@ -235,8 +225,9 @@ export class ToastDirective implements AfterViewInit, OnDestroy {
   }
 
   ngOnDestroy(): void {
-    if (this.overlayRef) {
-      this.overlayRef.dispose();
+    if (this.toastComponentRef) {
+      this.viewContainerRef.detach(0);
+      this.toastComponentRef.destroy();
     }
     if (this.notificationSubscription) {
       this.notificationSubscription.unsubscribe();
@@ -250,6 +241,8 @@ export class ToastDirective implements AfterViewInit, OnDestroy {
 interface ToastPanelData {
   notification: NotificationMessage;
   parent?: ElementRef;
+  panelClass: string[];
+  destroyToastComponent: () => void;
 }
 
 import {
@@ -288,6 +281,11 @@ export class TbSnackBarComponent implements AfterViewInit, OnDestroy {
 
   @ViewChild('actionButton', {static: true}) actionButton: MatButton;
 
+  @HostBinding('class')
+  get panelClass(): string[] {
+    return this.data.panelClass;
+  }
+
   private parentEl: HTMLElement;
   private snackBarContainerEl: HTMLElement;
   private parentScrollSubscription: Subscription = null;
@@ -305,9 +303,7 @@ export class TbSnackBarComponent implements AfterViewInit, OnDestroy {
               private data: ToastPanelData,
               private elementRef: ElementRef,
               @Optional()
-              private snackBarRef: MatSnackBarRef<TbSnackBarComponent>,
-              @Optional()
-              private overlayRef: OverlayRef) {
+              private snackBarRef: MatSnackBarRef<TbSnackBarComponent>) {
     this.animationState = !!this.snackBarRef ? 'default' : 'opened';
     this.notification = data.notification;
   }
@@ -319,9 +315,8 @@ export class TbSnackBarComponent implements AfterViewInit, OnDestroy {
       this.snackBarContainerEl.style.position = 'absolute';
       this.updateContainerRect();
       this.updatePosition(this.snackBarRef.containerInstance.snackBarConfig);
-      const snackBarComponent = this;
       this.parentScrollSubscription = onParentScrollOrWindowResize(this.parentEl).subscribe(() => {
-        snackBarComponent.updateContainerRect();
+        this.updateContainerRect();
       });
     }
   }
@@ -373,7 +368,7 @@ export class TbSnackBarComponent implements AfterViewInit, OnDestroy {
     const isFadeOut = (toState as ToastAnimationState) === 'closing';
     const itFinished = this.animationState === 'closing';
     if (isFadeOut && itFinished) {
-      this.overlayRef.dispose();
+      this.data.destroyToastComponent();
     }
   }
 }