From b758572e4465e172fd8011d0781047fcbefa67ef Mon Sep 17 00:00:00 2001
From: Edoardo Luppi <lp.edoardo@gmail.com>
Date: Sun, 28 Jul 2019 18:20:15 +0200
Subject: [PATCH] fix(module:dropdown): hide backdrop when disabled and restore
 escape (#3831)

close #3835
---
 .../dropdown/nz-dropdown.directive.spec.ts    | 68 +++++++++++++++++--
 components/dropdown/nz-dropdown.directive.ts  | 12 +++-
 2 files changed, 71 insertions(+), 9 deletions(-)

diff --git a/components/dropdown/nz-dropdown.directive.spec.ts b/components/dropdown/nz-dropdown.directive.spec.ts
index 519ce595b74..d76d612f637 100644
--- a/components/dropdown/nz-dropdown.directive.spec.ts
+++ b/components/dropdown/nz-dropdown.directive.spec.ts
@@ -1,9 +1,10 @@
+import { ESCAPE } from '@angular/cdk/keycodes';
 import { OverlayContainer } from '@angular/cdk/overlay';
 import { Component, Provider, Type } from '@angular/core';
 import { fakeAsync, inject, tick, ComponentFixture, TestBed } from '@angular/core/testing';
 import { By } from '@angular/platform-browser';
 import { NoopAnimationsModule } from '@angular/platform-browser/animations';
-import { dispatchFakeEvent } from '../core/testing';
+import { dispatchFakeEvent, dispatchKeyboardEvent } from '../core/testing';
 import { NzMenuModule } from '../menu/nz-menu.module';
 import { NzDropDownDirective } from './nz-dropdown.directive';
 import { NzDropDownModule } from './nz-dropdown.module';
@@ -95,21 +96,76 @@ describe('dropdown', () => {
       );
     }).not.toThrowError();
   }));
-  it('should backdrop be disabled', fakeAsync(() => {
+
+  describe('when nzBackdrop=false', () => {
+    let fixture: ComponentFixture<NzTestDropdownComponent>;
+
+    beforeEach(() => {
+      fixture = createComponent(NzTestDropdownComponent, [], []);
+      fixture.componentInstance.backdrop = false;
+    });
+
+    it('backdrop should be invisible if nzTrigger=click', fakeAsync(() => {
+      fixture.componentInstance.trigger = 'click';
+      fixture.detectChanges();
+
+      expect(() => {
+        const dropdownElement = fixture.debugElement.query(By.directive(NzDropDownDirective)).nativeElement;
+        dispatchFakeEvent(dropdownElement, 'click');
+
+        tick(1000);
+        fixture.detectChanges();
+
+        const backdrop = overlayContainerElement.querySelector('.nz-overlay-transparent-backdrop');
+        expect(backdrop).not.toBeNull();
+      }).not.toThrowError();
+    }));
+
+    it('should disappear if invisible backdrop clicked if nzTrigger=click', fakeAsync(() => {
+      fixture.componentInstance.trigger = 'click';
+      fixture.detectChanges();
+
+      expect(() => {
+        const dropdownElement = fixture.debugElement.query(By.directive(NzDropDownDirective)).nativeElement;
+        dispatchFakeEvent(dropdownElement, 'click');
+
+        tick(1000);
+        fixture.detectChanges();
+
+        const backdrop = overlayContainerElement.querySelector('.nz-overlay-transparent-backdrop');
+        expect(backdrop).not.toBeNull();
+
+        dispatchFakeEvent(backdrop as Element, 'click');
+        tick(1000);
+        fixture.detectChanges();
+
+        const nullBackdrop = overlayContainerElement.querySelector('.cdk-overlay-backdrop');
+        expect(nullBackdrop).toBeNull();
+      }).not.toThrowError();
+    }));
+  });
+
+  it('should disappear if Escape pressed', fakeAsync(() => {
     const fixture = createComponent(NzTestDropdownComponent, [], []);
     fixture.componentInstance.trigger = 'click';
-    fixture.componentInstance.backdrop = false;
     fixture.detectChanges();
 
     expect(() => {
       const dropdownElement = fixture.debugElement.query(By.directive(NzDropDownDirective)).nativeElement;
-      dispatchFakeEvent(dropdownElement, 'mouseenter');
-      fixture.detectChanges();
+
+      dispatchFakeEvent(dropdownElement, 'click');
       tick(1000);
       fixture.detectChanges();
 
       const backdrop = overlayContainerElement.querySelector('.cdk-overlay-backdrop');
-      expect(backdrop).toBeNull();
+      expect(backdrop).not.toBeNull();
+
+      dispatchKeyboardEvent(document.body, 'keydown', ESCAPE);
+      tick(1000);
+      fixture.detectChanges();
+
+      const nullBackdrop = overlayContainerElement.querySelector('.cdk-overlay-backdrop');
+      expect(nullBackdrop).toBeNull();
     }).not.toThrowError();
   }));
   it('should nzOverlayClassName and nzOverlayStyle work', fakeAsync(() => {
diff --git a/components/dropdown/nz-dropdown.directive.ts b/components/dropdown/nz-dropdown.directive.ts
index 9cf2603a3a2..4dab88be598 100644
--- a/components/dropdown/nz-dropdown.directive.ts
+++ b/components/dropdown/nz-dropdown.directive.ts
@@ -6,6 +6,7 @@
  * found in the LICENSE file at https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/LICENSE
  */
 
+import { hasModifierKey, ESCAPE } from '@angular/cdk/keycodes';
 import {
   ConnectedPosition,
   ConnectionPositionPair,
@@ -31,7 +32,7 @@ import {
 } from '@angular/core';
 import { DEFAULT_DROPDOWN_POSITIONS, InputBoolean, POSITION_MAP } from 'ng-zorro-antd/core';
 import { combineLatest, fromEvent, merge, EMPTY, Observable, Subject, Subscription } from 'rxjs';
-import { debounceTime, distinctUntilChanged, map, mapTo, takeUntil, tap } from 'rxjs/operators';
+import { debounceTime, distinctUntilChanged, filter, map, mapTo, takeUntil, tap } from 'rxjs/operators';
 import { NzDropdownMenuComponent, NzPlacementType } from './nz-dropdown-menu.component';
 
 @Directive({
@@ -90,7 +91,8 @@ export class NzDropDownDirective implements AfterViewInit, OnDestroy, OnChanges
         .flexibleConnectedTo(this.el)
         .withLockedPosition(),
       minWidth: this.triggerWidth,
-      hasBackdrop: this.nzBackdrop && this.nzTrigger === 'click',
+      hasBackdrop: this.nzTrigger === 'click',
+      backdropClass: this.nzBackdrop ? undefined : 'nz-overlay-transparent-backdrop',
       scrollStrategy: this.overlay.scrollStrategies.reposition()
     });
   }
@@ -133,7 +135,11 @@ export class NzDropDownDirective implements AfterViewInit, OnDestroy, OnChanges
 
   private subscribeOverlayEvent(overlayRef: OverlayRef): void {
     this.overlaySubscription.unsubscribe();
-    this.overlaySubscription = merge(overlayRef.backdropClick(), overlayRef.detachments())
+    this.overlaySubscription = merge(
+      overlayRef.backdropClick(),
+      overlayRef.detachments(),
+      overlayRef.keydownEvents().pipe(filter(e => e.keyCode === ESCAPE && !hasModifierKey(e)))
+    )
       .pipe(takeUntil(this.destroy$))
       .subscribe(() => {
         this.nzDropdownMenu.setVisibleStateWhen(false);