fix(api): remove circular dependencies

* fxShow and fxHide had 'unused' circular dependencies; which causes issues with the Clojure compiler
* add unit tests to show/hide to test for MatchMediObservable usages in templates

Fixes #88.

Author: ThomasBurleson

src/lib/flexbox/api/hide.spec.ts

@@ -1,9 +1,9 @@
-import {Component, OnInit} from '@angular/core';
+import {Component, OnInit, Inject} from '@angular/core';
 import {CommonModule} from '@angular/common';
 import {ComponentFixture, TestBed } from '@angular/core/testing';
 
 import {MockMatchMedia} from '../../media-query/mock/mock-match-media';
-import {MatchMedia} from '../../media-query/match-media';
+import {MatchMedia, MatchMediaObservable} from '../../media-query/match-media';
 import {BreakPointsProvider} from '../../media-query/providers/break-points-provider';
 import {BreakPointRegistry} from '../../media-query/breakpoints/break-point-registry';
 import {FlexLayoutModule} from '../_module';
@@ -100,6 +100,36 @@ describe('show directive', () => {
         });
 
       });
+
+      it('should support use of the `media` observable in templates ', () => {
+        fixture = createTestComponent(`
+            <div [fxHide]="media.isActive('xs')" >
+              ...content
+            </div>
+        `);
+        expectNativeEl(fixture).toHaveCssStyle({ 'display': 'flex' });
+
+        activateMediaQuery('xs');
+        expectNativeEl(fixture).toHaveCssStyle({ 'display': 'none' });
+
+        activateMediaQuery('lg');
+        expectNativeEl(fixture).toHaveCssStyle({ 'display': 'flex' });
+      });
+
+      it('should support use of the `media` observable in adaptive templates ', () => {
+        fixture = createTestComponent(`
+            <div fxHide="false" [fxHide.md]="media.isActive('xs')" >
+              ...content
+            </div>
+        `);
+        expectNativeEl(fixture).toHaveCssStyle({ 'display': 'flex' });
+
+        activateMediaQuery('xs');
+        expectNativeEl(fixture).toHaveCssStyle({ 'display': 'flex' });
+
+        activateMediaQuery('md');
+        expectNativeEl(fixture).toHaveCssStyle({ 'display': 'flex' });
+      });
 });
 
 
@@ -114,10 +144,12 @@ describe('show directive', () => {
 export class TestHideComponent implements OnInit {
   isVisible = 0;
   menuHidden: boolean = true;
+
+  constructor(@Inject(MatchMediaObservable) private media) { }
+
   toggleMenu() {
       this.menuHidden = !this.menuHidden;
   }
-  constructor() {  }
   ngOnInit() { }
 }
 

src/lib/flexbox/api/hide.ts

@@ -17,7 +17,6 @@ import {BaseFxDirective} from './base';
 import {MediaChange} from '../../media-query/media-change';
 import {MediaMonitor} from '../../media-query/media-monitor';
 
-import {ShowDirective} from "./show";
 import {LayoutDirective} from './layout';
 
 /**
@@ -65,7 +64,6 @@ export class HideDirective extends BaseFxDirective implements OnInit, OnChanges,
   constructor(
       monitor : MediaMonitor,
       @Optional() @Self() private _layout: LayoutDirective,
-      @Optional() @Self() private _showDirective : ShowDirective,
       protected elRef: ElementRef,
       protected renderer: Renderer) {
     super(monitor, elRef, renderer);
@@ -79,12 +77,6 @@ export class HideDirective extends BaseFxDirective implements OnInit, OnChanges,
     }
   }
 
-  /**
-   * Does the current element also use the fxShow API ?
-   */
-  protected get usesShowAPI() {
-    return !!this._showDirective;
-  }
 
   // *********************************************
   // Lifecycle Methods
@@ -134,9 +126,7 @@ export class HideDirective extends BaseFxDirective implements OnInit, OnChanges,
     }
 
     let shouldHide = this._validateTruthy(value);
-    if ( shouldHide || !this.usesShowAPI ) {
-      this._applyStyleToElement(this._buildCSS(shouldHide));
-    }
+    this._applyStyleToElement(this._buildCSS(shouldHide));
   }
 
 

src/lib/flexbox/api/show.spec.ts

@@ -1,9 +1,9 @@
-import {Component, OnInit} from '@angular/core';
+import {Component, OnInit, Inject} from '@angular/core';
 import {CommonModule} from '@angular/common';
 import {ComponentFixture, TestBed } from '@angular/core/testing';
 
 import {MockMatchMedia} from '../../media-query/mock/mock-match-media';
-import {MatchMedia} from '../../media-query/match-media';
+import {MatchMedia, MatchMediaObservable} from '../../media-query/match-media';
 import {BreakPointsProvider} from '../../media-query/providers/break-points-provider';
 import {BreakPointRegistry} from '../../media-query/breakpoints/break-point-registry';
 import {FlexLayoutModule} from '../_module';
@@ -66,6 +66,9 @@ describe('show directive', () => {
         </div>  
       `);
       expectNativeEl(fixture).toHaveCssStyle({ 'display': 'none' });
+
+      fixture.componentInstance.isVisible = true;
+      expectNativeEl(fixture).toHaveCssStyle({ 'display': 'flex' });
     });
 
     it('should update styles with binding changes', () => {
@@ -105,6 +108,21 @@ describe('show directive', () => {
         expectNativeEl(fixture).toHaveCssStyle({ 'display': 'none' });
       });
 
+      it('should support use of the `media` observable in templates ', () => {
+        fixture = createTestComponent(`
+            <div [fxShow]="media.isActive('xs')" >
+              ...content
+            </div>
+        `);
+        expectNativeEl(fixture).toHaveCssStyle({ 'display': 'none' });
+
+        activateMediaQuery('xs', true);
+        expectNativeEl(fixture).toHaveCssStyle({ 'display': 'flex' });
+
+        activateMediaQuery('gt-md', true);
+        expectNativeEl(fixture).toHaveCssStyle({ 'display': 'none' });
+      });
+
     });
 });
 
@@ -120,10 +138,12 @@ describe('show directive', () => {
 export class TestShowComponent implements OnInit {
   isVisible = 0;
   menuOpen: boolean = true;
+
+  constructor(@Inject(MatchMediaObservable) private media) { }
+
   toggleMenu() {
       this.menuOpen = !this.menuOpen;
   }
-  constructor() {  }
   ngOnInit() { }
 }
 

src/lib/flexbox/api/show.ts

@@ -8,9 +8,7 @@ import {
   Renderer,
   SimpleChanges,
   Self,
-  Optional,
-  Inject,
-  forwardRef
+  Optional
 } from '@angular/core';
 
 import {Subscription} from 'rxjs/Subscription';
@@ -19,7 +17,6 @@ import {BaseFxDirective} from './base';
 import {MediaChange} from '../../media-query/media-change';
 import {MediaMonitor} from '../../media-query/media-monitor';
 
-import {HideDirective} from "./hide";
 import {LayoutDirective} from './layout';
 
 
@@ -70,7 +67,6 @@ export class ShowDirective extends BaseFxDirective implements OnInit, OnChanges,
   constructor(
       monitor : MediaMonitor,
       @Optional() @Self() private _layout: LayoutDirective,
-      @Inject(forwardRef(() => HideDirective)) @Optional() @Self() private _hideDirective,
       protected elRef: ElementRef,
       protected renderer: Renderer)
   {
@@ -85,14 +81,6 @@ export class ShowDirective extends BaseFxDirective implements OnInit, OnChanges,
     }
   }
 
-  /**
-    * Does the current element also use the fxShow API ?
-    */
-   protected get usesHideAPI() {
-     return !!this._hideDirective;
-   }
-
-
   // *********************************************
   // Lifecycle Methods
   // *********************************************
@@ -138,9 +126,7 @@ export class ShowDirective extends BaseFxDirective implements OnInit, OnChanges,
     }
 
     let shouldShow = this._validateTruthy(value);
-    if ( shouldShow || !this.usesHideAPI ) {
-      this._applyStyleToElement(this._buildCSS(shouldShow));
-    }
+    this._applyStyleToElement(this._buildCSS(shouldShow));
   }