Optimize the code and fix bug

1. Create a new descripition component code
2. Optimize the code to extract a MaaS feature module and a common module.
3. Optimize the service code and create a new maasService.
4.Click the Q&A Assistant menu, the front-end interface does not deliver an application ID.

Issue-ID: USECASEUI-844
Change-Id: If57938f9c57b186691798eb0fb2cdd2fd64ed58a
Signed-off-by: kaixiliu <liukaixi@chinamobile.com>

1 files changed, 79 insertions, 0 deletions

diff --git a/usecaseui-portal/src/app/shared/components/description/description.component.ts b/usecaseui-portal/src/app/shared/components/description/description.component.ts
new file mode 100644
index 00000000..6f3469d9
--- /dev/null
+++ b/usecaseui-portal/src/app/shared/components/description/description.component.ts
@@ -0,0 +1,79 @@
+import { Component, ContentChildren, EventEmitter, Input, OnDestroy, OnInit, QueryList } from '@angular/core';
+import { Subject } from 'rxjs';
+import { DescriptionItemComponent } from './descriptions-item.component';
+import { DescriptionItemRenderProps } from './description.type';
+@Component({
+  selector: 'app-descriptions',
+  templateUrl: './description.component.html',
+  styleUrls: ['./description.component.less'],
+})
+export class DescriptionComponent implements OnInit, OnDestroy {
+  @ContentChildren(DescriptionItemComponent) items: QueryList<DescriptionItemComponent>;
+
+  @Input() nzColumn: number = 3;
+  @Input() nzTitle: string = '';
+  @Input() nzColon: boolean = true;
+
+  itemMatrix: DescriptionItemRenderProps[][] = [];
+  private destroy$ = new Subject<void>();
+  constructor() { }
+
+  ngOnInit() {
+  }
+
+  ngAfterContentInit(): void {
+    this.prepareMatrix();
+  }
+
+
+  ngOnDestroy() {
+    this.destroy$.next();
+    this.destroy$.complete();
+  }
+
+   /**
+   * Prepare the render matrix according to description items' spans.
+   */
+   private prepareMatrix(): void {
+    if (!this.items) {
+      return;
+    }
+
+    let currentRow: DescriptionItemRenderProps[] = [];
+    let width = 0;
+
+    const column = this.nzColumn;
+    const items = this.items.toArray();
+    const length = items.length;
+    const matrix: DescriptionItemRenderProps[][] = [];
+    const flushRow = (): void => {
+      matrix.push(currentRow);
+      currentRow = [];
+      width = 0;
+    };
+
+    for (let i = 0; i < length; i++) {
+      const item = items[i];
+      const { nzTitle: title, content, nzSpan: span } = item;
+
+      width += span;
+
+      if (width >= column) {
+        if (width > column) {
+          console.warn(`"nzColumn" is ${column} but we have row length ${width}`);
+          flushRow();
+        }
+        currentRow.push({ title, content, span });
+        flushRow();
+      } else if (i === length - 1) {
+        currentRow.push({ title, content, span: column - (width - span) });
+        flushRow();
+      } else {
+        currentRow.push({ title, content, span });
+      }
+    }
+
+    this.itemMatrix = matrix;
+  }
+
+}
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