feat(module:modal): support customized modal config (current "autoBod…

…yPadding")

close NG-ZORRO#1720

components/modal/doc/index.en-US.md

@@ -16,6 +16,17 @@ and so on.
 
 It is recommended to use the `Component` way to pop up the Modal, so that the component logic of the popup layer can be completely isolated from the outer component, and can be reused at any time. In the popup layer component, you can obtain Modal's component instance by injecting `NzModalRef` to control the behavior of the modal box.
 
+## How To Use
+
+If you want to modify the global default configuration, you can modify the value of provider `NZ_MODAL_CONFIG`.
+(eg, add `{ provide: NZ_MODAL_CONFIG, useValue: { autoBodyPadding: false }}` to `providers` of your module, `NZ_MODAL_CONFIG` can be imported from `ng-zorro-antd`)
+
+The default global configuration is:
+```js
+{
+  autoBodyPadding: true, // Whether to automatically add "padding" and "overflow" the body to hide the scroll bar
+}
+```
 
 ## API
 

components/modal/doc/index.zh-CN.md

@@ -17,6 +17,18 @@ title: Modal
 
 在弹出层Component中可以通过依赖注入`NzModalRef`方式直接获取模态框的组件实例，用于控制在弹出层组件中控制模态框行为。
 
+## 如何使用
+
+如果要修改全局默认配置，你可以设置提供商 `NZ_MODAL_CONFIG` 的值来修改。
+（如：在你的模块的`providers`中加入 `{ provide: NZ_MODAL_CONFIG, useValue: { autoBodyPadding: false }}`，`NZ_MODAL_CONFIG` 可以从 `ng-zorro-antd` 中导入）
+
+默认全局配置为：
+```js
+{
+  autoBodyPadding: true, // 是否自动给body加上padding及overflow来隐藏滚动条
+}
+```
+
 ## API
 
 ### NzModalService

components/modal/nz-modal-config.ts

@@ -0,0 +1,16 @@
+import { InjectionToken } from '@angular/core';
+
+export const NZ_MODAL_DEFAULT_CONFIG: NzModalConfig = {
+  autoBodyPadding: true
+};
+
+export const NZ_MODAL_CONFIG = new InjectionToken<NzModalConfig>('NzModalConfig', {
+  providedIn: 'root',
+  factory: () => NZ_MODAL_DEFAULT_CONFIG // Default config
+});
+
+////////////
+
+export interface NzModalConfig {
+  autoBodyPadding: boolean; // Whether add the padding-right and overflow to body automatically to play smoothly
+}

components/modal/nz-modal.component.ts

@@ -31,6 +31,7 @@ import { InputBoolean } from '../core/util/convert';
 import { NzI18nService } from '../i18n/nz-i18n.service';
 
 import ModalUtil from './modal-util';
+import { NzModalConfig, NZ_MODAL_CONFIG, NZ_MODAL_DEFAULT_CONFIG } from './nz-modal-config';
 import { NzModalControlService } from './nz-modal-control.service';
 import { NzModalRef } from './nz-modal-ref.class';
 import { ModalButtonOptions, ModalOptions, ModalType, OnClickCallback } from './nz-modal.type';
@@ -128,9 +129,12 @@ export class NzModalComponent<T = any, R = any> extends NzModalRef<T, R> impleme
     private viewContainer: ViewContainerRef,
     private nzMeasureScrollbarService: NzMeasureScrollbarService,
     private modalControl: NzModalControlService,
+    @Inject(NZ_MODAL_CONFIG) private config: NzModalConfig,
     @Inject(DOCUMENT) private document: any) { // tslint:disable-line:no-any
 
     super();
+
+    this.config = this.mergeDefaultConfig(this.config);
   }
 
   ngOnInit(): void {
@@ -411,16 +415,22 @@ export class NzModalComponent<T = any, R = any> extends NzModalRef<T, R> impleme
    * @param plusNum The number that the openModals.length will increase soon
    */
   private changeBodyOverflow(plusNum: number = 0): void {
-    const openModals = this.modalControl.openModals;
+    if (this.config.autoBodyPadding) {
+      const openModals = this.modalControl.openModals;
 
-    if (openModals.length + plusNum > 0) {
-      this.renderer.setStyle(this.document.body, 'padding-right', `${this.nzMeasureScrollbarService.scrollBarWidth}px`);
-      this.renderer.setStyle(this.document.body, 'overflow', 'hidden');
-    } else {
-      this.renderer.removeStyle(this.document.body, 'padding-right');
-      this.renderer.removeStyle(this.document.body, 'overflow');
+      if (openModals.length + plusNum > 0) {
+        this.renderer.setStyle(this.document.body, 'padding-right', `${this.nzMeasureScrollbarService.scrollBarWidth}px`);
+        this.renderer.setStyle(this.document.body, 'overflow', 'hidden');
+      } else {
+        this.renderer.removeStyle(this.document.body, 'padding-right');
+        this.renderer.removeStyle(this.document.body, 'overflow');
+      }
     }
   }
+
+  private mergeDefaultConfig(config: NzModalConfig): NzModalConfig {
+    return { ...NZ_MODAL_DEFAULT_CONFIG, ...config };
+  }
 }
 
 ////////////

components/modal/nz-modal.spec.ts

@@ -13,6 +13,7 @@ import { NzMeasureScrollbarService } from '../core/services/nz-measure-scrollbar
 import en_US from '../i18n/languages/en_US';
 import { NzI18nService } from '../i18n/nz-i18n.service';
 import { CssUnitPipe } from './css-unit.pipe';
+import { NZ_MODAL_CONFIG } from './nz-modal-config';
 import { NzModalControlService } from './nz-modal-control.service';
 import { NzModalRef } from './nz-modal-ref.class';
 import { MODAL_ANIMATE_DURATION, NzModalComponent } from './nz-modal.component';
@@ -476,6 +477,39 @@ describe('NzModal', () => {
   });
 });
 
+describe('NzModal with config settled', () => {
+  let modalService: NzModalService;
+
+  beforeEach(fakeAsync(() => {
+    TestBed.configureTestingModule({
+      imports: [ NzModalModule ],
+      providers: [{
+        provide: NZ_MODAL_CONFIG,
+        useValue: {
+          autoBodyPadding: false // Disable body padding
+        }
+      }]
+    }).compileComponents();
+  }));
+
+  beforeEach(inject([ NzModalService ], (ms: NzModalService) => {
+    modalService = ms;
+  }));
+
+  it('should disable body padding', () => {
+    const modalInstance = modalService.create().getInstance();
+    // Both style operating should not be called
+    // tslint:disable-next-line:no-string-literal
+    const setStyle = spyOn(modalInstance['renderer'], 'setStyle');
+    // tslint:disable-next-line:no-string-literal
+    const removeStyle = spyOn(modalInstance['renderer'], 'removeStyle');
+    // tslint:disable-next-line:no-string-literal
+    modalInstance['changeBodyOverflow']();
+    expect(setStyle).not.toHaveBeenCalled();
+    expect(removeStyle).not.toHaveBeenCalled();
+  });
+});
+
 // -------------------------------------------
 // | Testing Components
 // -------------------------------------------

components/modal/public-api.ts

@@ -2,4 +2,5 @@ export { NzModalComponent } from './nz-modal.component';
 export { NzModalRef } from './nz-modal-ref.class';
 export { NzModalModule } from './nz-modal.module';
 export { NzModalService } from './nz-modal.service';
+export { NZ_MODAL_CONFIG, NzModalConfig } from './nz-modal-config';
 export * from './nz-modal.type';