passing template ref

angular.json

@@ -7,7 +7,7 @@
       "root": "",
       "sourceRoot": "src",
       "projectType": "application",
-      "prefix": "app",
+      "prefix": "c3",
       "schematics": {
         "@schematics/angular:component": {
           "style": "sass"
@@ -137,4 +137,4 @@
     }
   },
   "defaultProject": "angular-tooltip-html"
-}
+}

src/app/app.component.html

@@ -1,20 +1,4 @@
-<!--The content below is only a placeholder and can be replaced.-->
-<div style="text-align:center">
-  <h1>
-    Welcome to {{ title }}!
-  </h1>
-  <img width="300" alt="Angular Logo" src="data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAyNTAgMjUwIj4KICAgIDxwYXRoIGZpbGw9IiNERDAwMzEiIGQ9Ik0xMjUgMzBMMzEuOSA2My4ybDE0LjIgMTIzLjFMMTI1IDIzMGw3OC45LTQzLjcgMTQuMi0xMjMuMXoiIC8+CiAgICA8cGF0aCBmaWxsPSIjQzMwMDJGIiBkPSJNMTI1IDMwdjIyLjItLjFWMjMwbDc4LjktNDMuNyAxNC4yLTEyMy4xTDEyNSAzMHoiIC8+CiAgICA8cGF0aCAgZmlsbD0iI0ZGRkZGRiIgZD0iTTEyNSA1Mi4xTDY2LjggMTgyLjZoMjEuN2wxMS43LTI5LjJoNDkuNGwxMS43IDI5LjJIMTgzTDEyNSA1Mi4xem0xNyA4My4zaC0zNGwxNy00MC45IDE3IDQwLjl6IiAvPgogIDwvc3ZnPg==">
-</div>
-<h2>Here are some links to help you start: </h2>
-<ul>
-  <li>
-    <h2><a target="_blank" rel="noopener" href="https://angular.io/tutorial">Tour of Heroes</a></h2>
-  </li>
-  <li>
-    <h2><a target="_blank" rel="noopener" href="https://angular.io/cli">CLI Documentation</a></h2>
-  </li>
-  <li>
-    <h2><a target="_blank" rel="noopener" href="https://blog.angular.io/">Angular blog</a></h2>
-  </li>
-</ul>
-
+<app-componentWithContentOrNot>
+	<button [c3Tooltip]="content"></button>
+	<c3-tooltip #content="c3Tooltip" ></c3-tooltip>
+</app-componentWithContentOrNot>

src/app/app.module.ts

@@ -2,15 +2,23 @@ import { BrowserModule } from '@angular/platform-browser';
 import { NgModule } from '@angular/core';
 
 import { AppComponent } from './app.component';
+import { ComponentWithContentOrNotComponent } from './componentWithContentOrNot/componentWithContentOrNot.component';
+import { HasContentComponent } from './hasContent/hasContent.component';
+import { C3TooltipModule } from './c3-tooltip/c3-tooltip.module';
 
 @NgModule({
-  declarations: [
-    AppComponent
-  ],
-  imports: [
-    BrowserModule
-  ],
-  providers: [],
-  bootstrap: [AppComponent]
+   declarations: [
+      AppComponent,
+      ComponentWithContentOrNotComponent,
+      HasContentComponent
+   ],
+   imports: [
+			BrowserModule,
+			C3TooltipModule
+   ],
+   providers: [],
+   bootstrap: [
+      AppComponent
+   ]
 })
 export class AppModule { }

src/app/c3-tooltip/c3-tooltip.component.html

@@ -0,0 +1,5 @@
+<ng-template>	
+	<p>
+		c3-tooltip works!
+	</p>
+</ng-template>

src/app/c3-tooltip/c3-tooltip.component.ts

@@ -0,0 +1,17 @@
+import { Component, OnInit, ViewChild, TemplateRef } from '@angular/core';
+
+@Component({
+	selector: 'c3-tooltip',
+	templateUrl: './c3-tooltip.component.html',
+	styleUrls: ['./c3-tooltip.component.css'],
+	exportAs: 'c3Tooltip'
+})
+export class C3Tooltip implements OnInit {
+	@ViewChild(TemplateRef, { read: false }) template: TemplateRef<any>;
+
+	constructor() { }
+
+	ngOnInit() {
+	}
+
+}

src/app/c3-tooltip/c3-tooltip.module.ts

@@ -0,0 +1,19 @@
+import { NgModule } from '@angular/core';
+import { CommonModule } from '@angular/common';
+import { C3Tooltip } from './c3-tooltip.component';
+import { C3TooltipTrigger } from './c3-tooltipTrigger.directive';
+
+@NgModule({
+   imports: [
+		CommonModule
+   ],
+   declarations: [
+		C3Tooltip,
+		C3TooltipTrigger
+	 ],
+	 exports: [
+		C3Tooltip,
+		C3TooltipTrigger
+	 ]
+})
+export class C3TooltipModule { }

src/app/c3-tooltip/c3-tooltipTrigger.directive.ts

@@ -0,0 +1,28 @@
+import { Directive, forwardRef, Input, AfterViewInit, ElementRef, ViewContainerRef } from '@angular/core';
+import { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms';
+import { C3Tooltip } from './c3-tooltip.component';
+
+export const MAT_AUTOCOMPLETE_VALUE_ACCESSOR: any = {
+	provide: NG_VALUE_ACCESSOR,
+	useExisting: forwardRef(() => C3TooltipTrigger),
+	multi: true
+};
+
+@Directive({
+	selector: 'button[c3Tooltip]',
+	exportAs: 'c3TooltipTrigger',
+	providers: [MAT_AUTOCOMPLETE_VALUE_ACCESSOR]
+})
+export class C3TooltipTrigger implements AfterViewInit {
+	@Input('c3Tooltip') tooltip: C3Tooltip;
+
+	constructor(
+		private _element: ElementRef<HTMLInputElement>,
+		// private _overlay: Overlay,
+		private _viewContainerRef: ViewContainerRef) {
+	}
+
+	ngAfterViewInit() {
+		console.log(this.tooltip.template)
+	}
+}

src/app/componentWithContentOrNot/componentWithContentOrNot.component.html

@@ -0,0 +1,11 @@
+<div *ngIf="hasChild">J'ai un enfant !</div>
+<ng-container *ngIf="hasChild; else elseTemplate">
+	J'ai un enfant !
+</ng-container>
+<ng-template #elseTemplate>
+	Je n'ai pas d'enfant !
+</ng-template>
+
+<app-content [(hasChild)]="hasChild" (hasChildChange)="hasChildChange($event)">
+	<ng-content></ng-content>
+</app-content>

src/app/componentWithContentOrNot/componentWithContentOrNot.component.spec.ts

@@ -0,0 +1,28 @@
+/* tslint:disable:no-unused-variable */
+import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+import { By } from '@angular/platform-browser';
+import { DebugElement } from '@angular/core';
+
+import { ComponentWithContentOrNotComponent } from './componentWithContentOrNot.component';
+
+describe('ComponentWithContentOrNotComponent', () => {
+  let component: ComponentWithContentOrNotComponent;
+  let fixture: ComponentFixture<ComponentWithContentOrNotComponent>;
+
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      declarations: [ ComponentWithContentOrNotComponent ]
+    })
+    .compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(ComponentWithContentOrNotComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

src/app/componentWithContentOrNot/componentWithContentOrNot.component.ts

@@ -0,0 +1,21 @@
+import { Component, OnInit, ElementRef, ViewChild, ChangeDetectorRef } from '@angular/core';
+
+@Component({
+  selector: 'app-componentWithContentOrNot',
+  templateUrl: './componentWithContentOrNot.component.html',
+  styleUrls: ['./componentWithContentOrNot.component.css']
+})
+export class ComponentWithContentOrNotComponent implements OnInit {
+	// @ViewChild('content') content: ElementRef;
+
+  constructor(
+		private changeDetector: ChangeDetectorRef
+	) {}
+
+  ngOnInit() {
+	}
+	
+	hasChildChange(event) {
+		this.changeDetector.detectChanges()
+	}
+}

src/app/hasContent/hasContent.component.html

@@ -0,0 +1,3 @@
+<div #content>
+	<ng-content ></ng-content>
+</div>

src/app/hasContent/hasContent.component.spec.ts

@@ -0,0 +1,28 @@
+/* tslint:disable:no-unused-variable */
+import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+import { By } from '@angular/platform-browser';
+import { DebugElement } from '@angular/core';
+
+import { HasContentComponent } from './hasContent.component';
+
+describe('HasContentComponent', () => {
+  let component: HasContentComponent;
+  let fixture: ComponentFixture<HasContentComponent>;
+
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      declarations: [ HasContentComponent ]
+    })
+    .compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(HasContentComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

src/app/hasContent/hasContent.component.ts

@@ -0,0 +1,20 @@
+import { Component, OnInit, ViewChild, ElementRef, AfterViewInit, Output, EventEmitter, Input } from '@angular/core';
+import { Content } from '@angular/compiler/src/render3/r3_ast';
+
+@Component({
+  selector: 'app-content',
+  templateUrl: './hasContent.component.html',
+  styleUrls: ['./hasContent.component.css']
+})
+export class HasContentComponent implements AfterViewInit {
+	@ViewChild('content') content: ElementRef;
+	@Input() hasChild: Boolean = false;
+	@Output() hasChildChange : EventEmitter<Boolean> = new EventEmitter<Boolean>()
+
+  constructor() { }
+
+	ngAfterViewInit(){
+		this.hasChildChange.emit(!!this.content.nativeElement.childNodes.length);
+	}
+
+}