virtual scroll of organization is implemented

2019-11-15 10:13:18 +09:00 · 2019-11-15 10:13:18 +09:00 · 50c8c2a02d
commit 50c8c2a02d
parent 241fd65d31
11 changed files with 355 additions and 215 deletions
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-side.component.scss
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-side.component.scss
@ -63,7 +63,7 @@
      justify-content: center;
      align-items: center;
      transform: scale(0.9);
-      transition: transform .3s cubic-bezier(.4,0,0,1);
+      transition: transform 0.3s cubic-bezier(0.4, 0, 0, 1);

      svg {
        width: 24px;
@ -82,7 +82,7 @@
    .mat-tab-label-content {
      .icon-item {
        background: #ef4c73;
-        transform: scale(1.0);
+        transform: scale(1);
        /*svg {
          stroke: #ef4c73;
          fill: #ef4c73;
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/group.component.ts
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/group.component.ts
@ -71,7 +71,7 @@ export class GroupComponent implements OnInit, OnDestroy {
    UserInfo | UserInfoSS | UserInfoF | UserInfoDN
  >();

-  @ViewChild('groupExpansionPanel', { static: true })
+  @ViewChild('groupExpansionPanel', { static: false })
  groupExpansionPanel: GroupExpansionPanelComponent;

  @ViewChild('profileContextMenuTrigger', { static: true })
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/organization.component.html
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/organization.component.html
@ -10,7 +10,7 @@
  >
  </ucap-organization-tenant-search>
 </div>
-<div class="oraganization-tab" *ngIf="departmentInfoList$ | async">
+<div class="oraganization-tab">
  <div class="oraganization-tab-tree">
    <ucap-organization-tree
      [oraganizationList]="departmentInfoList$ | async"
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/messages.component.ts
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/messages.component.ts
@ -6,7 +6,7 @@ import {
  ElementRef,
  AfterViewInit,
  Output,
-  EventEmitter,
+  EventEmitter
 } from '@angular/core';
 import {
  ucapAnimations,
@ -20,7 +20,7 @@ import {
  AlertDialogData,
  AlertDialogResult,
  FileUploadQueueComponent,
-  StringUtil,
+  StringUtil
 } from '@ucap-webmessenger/ui';
 import { Store, select } from '@ngrx/store';
 import { NGXLogger } from 'ngx-logger';
@ -33,7 +33,7 @@ import {
  isRecallable,
  InfoResponse,
  EventJson,
-  FileEventJson,
+  FileEventJson
 } from '@ucap-webmessenger/protocol-event';

 import * as AppStore from '@app/store';
@ -47,36 +47,36 @@ import {
  EnvironmentsInfo,
  KEY_ENVIRONMENTS_INFO,
  UserSelectDialogType,
-  RightDrawer,
+  RightDrawer
 } from '@app/types';
 import { RoomInfo, UserInfo, RoomType } from '@ucap-webmessenger/protocol-room';
 import { tap, take, map, catchError } from 'rxjs/operators';
 import {
  FileInfo,
-  FormComponent as UCapUiChatFormComponent,
+  FormComponent as UCapUiChatFormComponent
 } from '@ucap-webmessenger/ui-chat';
 import { KEY_VER_INFO } from '@app/types/ver-info.type';
 import { VersionInfo2Response } from '@ucap-webmessenger/api-public';
 import {
  MatMenuTrigger,
  MatSnackBarRef,
-  SimpleSnackBar,
+  SimpleSnackBar
 } from '@angular/material';
 import {
  CommonApiService,
  FileUploadItem,
  FileTalkSaveRequest,
-  FileTalkSaveResponse,
+  FileTalkSaveResponse
 } from '@ucap-webmessenger/api-common';
 import {
  CreateChatDialogComponent,
  CreateChatDialogData,
-  CreateChatDialogResult,
+  CreateChatDialogResult
 } from '../dialogs/chat/create-chat.dialog.component';
 import {
  FileViewerDialogComponent,
  FileViewerDialogData,
-  FileViewerDialogResult,
+  FileViewerDialogResult
 } from '@app/layouts/common/dialogs/file-viewer.dialog.component';
 import { CONST, FileUtil } from '@ucap-webmessenger/core';
 import { PerfectScrollbarComponent } from 'ngx-perfect-scrollbar';
@ -84,12 +84,12 @@ import { StatusCode } from '@ucap-webmessenger/api';
 import {
  EditChatRoomDialogComponent,
  EditChatRoomDialogResult,
-  EditChatRoomDialogData,
+  EditChatRoomDialogData
 } from '../dialogs/chat/edit-chat-room.dialog.component';
 import {
  SelectGroupDialogComponent,
  SelectGroupDialogResult,
-  SelectGroupDialogData,
+  SelectGroupDialogData
 } from '../dialogs/group/select-group.dialog.component';
 import { GroupDetailData } from '@ucap-webmessenger/protocol-sync';

@ -97,7 +97,7 @@ import { GroupDetailData } from '@ucap-webmessenger/protocol-sync';
  selector: 'app-layout-messenger-messages',
  templateUrl: './messages.component.html',
  styleUrls: ['./messages.component.scss'],
-  animations: ucapAnimations,
+  animations: ucapAnimations
 })
 export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
  @Output()
@ -379,7 +379,7 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
          // duration: 3000,
          verticalPosition: 'bottom',
          horizontalPosition: 'center',
-          panelClass: ['chat-snackbar-class'],
+          panelClass: ['chat-snackbar-class']
        });
        this.snackBarPreviewEvent.onAction().subscribe(() => {
          this.setEventMoreInit();
@ -420,7 +420,7 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
        EventStore.info({
          roomSeq: this.roomInfo.roomSeq,
          baseSeq: seq,
-          requestCount: CONST.EVENT_INFO_READ_COUNT,
+          requestCount: CONST.EVENT_INFO_READ_COUNT
        })
      );
    }
@ -438,8 +438,8 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
        width: '360px',
        data: {
          title: 'Alert',
-          message: `대화내용을 입력해주세요.`,
-        },
+          message: `대화내용을 입력해주세요.`
+        }
      });
      return;
    }
@ -453,8 +453,8 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
            roomSeq: this.roomInfo.roomSeq,
            eventType: EventType.MassText,
            // sentMessage: message.replace(/\n/gi, '\r\n')
-            sentMessage: message,
-          },
+            sentMessage: message
+          }
        })
      );
    } else {
@ -464,8 +464,8 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
          req: {
            roomSeq: this.roomInfo.roomSeq,
            eventType: EventType.Character,
-            sentMessage: message,
-          },
+            sentMessage: message
+          }
        })
      );
    }
@ -479,7 +479,7 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
  onMassDetail(value: number) {
    this.store.dispatch(
      ChatStore.selectedMassDetail({
-        massEventSeq: value,
+        massEventSeq: value
      })
    );
  }
@ -491,7 +491,7 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
      FileViewerDialogResult
    >(FileViewerDialogComponent, {
      position: {
-        top: '30px',
+        top: '30px'
      },
      maxWidth: '100vw',
      maxHeight: '100vh',
@ -504,8 +504,8 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
        downloadUrl: this.sessionVerInfo.downloadUrl,
        deviceType: this.environmentsInfo.deviceType,
        token: this.loginRes.tokenString,
-        userSeq: this.loginRes.userSeq,
-      },
+        userSeq: this.loginRes.userSeq
+      }
    });
  }

@ -531,7 +531,7 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {

    const info = {
      senderSeq: this.loginRes.userSeq,
-      roomSeq: this.roomInfo.roomSeq,
+      roomSeq: this.roomInfo.roomSeq
    };

    const allObservables: Observable<FileTalkSaveResponse>[] = [];
@ -552,7 +552,7 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
          'rv',
          'ts',
          'webm',
-          'wmv',
+          'wmv'
        ].indexOf(FileUtil.getExtension(fileUploadItem.file.name))
      ) {
        thumbnail = await FileUtil.thumbnail(fileUploadItem.file);
@ -567,7 +567,7 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
        file: fileUploadItem.file,
        fileName: fileUploadItem.file.name,
        thumb: thumbnail,
-        fileUploadItem,
+        fileUploadItem
      };

      allObservables.push(
@ -599,8 +599,8 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
                req: {
                  roomSeq: info.roomSeq,
                  eventType: EventType.File,
-                  sentMessage: res.returnJson,
-                },
+                  sentMessage: res.returnJson
+                }
              })
            );
          }
@ -626,7 +626,7 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
    this.messageContextMenuTrigger.menu.focusFirstItem('mouse');
    this.messageContextMenuTrigger.menuData = {
      message: params.message,
-      loginRes: this.loginRes,
+      loginRes: this.loginRes
    };
    this.messageContextMenuTrigger.openMenu();
  }
@ -646,7 +646,7 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
                  this.snackBarService.open('클립보드에 복사되었습니다.', '', {
                    duration: 3000,
                    verticalPosition: 'top',
-                    horizontalPosition: 'center',
+                    horizontalPosition: 'center'
                  });
                }
              }
@ -658,7 +658,7 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
                    userSeq: this.loginRes.userSeq,
                    deviceType: this.environmentsInfo.deviceType,
                    token: this.loginRes.tokenString,
-                    eventMassSeq: message.seq,
+                    eventMassSeq: message.seq
                  })
                  .pipe(take(1))
                  .subscribe(res => {
@ -669,7 +669,7 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
                        {
                          duration: 3000,
                          verticalPosition: 'top',
-                          horizontalPosition: 'center',
+                          horizontalPosition: 'center'
                        }
                      );
                    }
@ -693,8 +693,8 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
            data: {
              type: UserSelectDialogType.MessageForward,
              title: 'MessageForward',
-              ignoreRoom: [this.roomInfo],
-            },
+              ignoreRoom: [this.roomInfo]
+            }
          });

          if (!!result && !!result.choice && result.choice) {
@ -718,10 +718,10 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
                  req: {
                    roomSeq: '-999',
                    eventType: message.type,
-                    sentMessage: message.sentMessage,
+                    sentMessage: message.sentMessage
                  },
                  trgtUserSeqs: userSeqs,
-                  trgtRoomSeq: roomSeq,
+                  trgtRoomSeq: roomSeq
                })
              );
            }
@ -737,9 +737,9 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
                req: {
                  roomSeq: '-999',
                  eventType: message.type,
-                  sentMessage: message.sentMessage,
+                  sentMessage: message.sentMessage
                },
-                trgtUserSeqs: [this.loginRes.talkWithMeBotSeq],
+                trgtUserSeqs: [this.loginRes.talkWithMeBotSeq]
              })
            );
          }
@ -755,15 +755,15 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
            width: '220px',
            data: {
              title: 'Delete',
-              html: `선택한 메시지를 삭제하시겠습니까?<br/>삭제된 메시지는 내 대화방에서만 적용되며 상대방의 대화방에서는 삭제되지 않습니다.`,
-            },
+              html: `선택한 메시지를 삭제하시겠습니까?<br/>삭제된 메시지는 내 대화방에서만 적용되며 상대방의 대화방에서는 삭제되지 않습니다.`
+            }
          });

          if (!!result && !!result.choice && result.choice) {
            this.store.dispatch(
              EventStore.del({
                roomSeq: this.roomInfo.roomSeq,
-                eventSeq: message.seq,
+                eventSeq: message.seq
              })
            );
          }
@ -779,8 +779,8 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
            width: '220px',
            data: {
              title: 'ReCall',
-              html: `해당 대화를 회수하시겠습니까?<br/>상대방 대화창에서도 회수됩니다.`,
-            },
+              html: `해당 대화를 회수하시겠습니까?<br/>상대방 대화창에서도 회수됩니다.`
+            }
          });

          if (!!result && !!result.choice && result.choice) {
@ -788,7 +788,7 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
              EventStore.cancel({
                roomSeq: this.roomInfo.roomSeq,
                eventSeq: message.seq,
-                deviceType: this.environmentsInfo.deviceType,
+                deviceType: this.environmentsInfo.deviceType
              })
            );
          }
@ -805,7 +805,7 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
        {
          this.store.dispatch(
            ChatStore.selectedRightDrawer({
-              req: RightDrawer.AlbumBox,
+              req: RightDrawer.AlbumBox
            })
          );
        }
@ -814,7 +814,7 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
        {
          this.store.dispatch(
            ChatStore.selectedRightDrawer({
-              req: RightDrawer.FileBox,
+              req: RightDrawer.FileBox
            })
          );
        }
@ -823,7 +823,7 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
        {
          this.store.dispatch(
            ChatStore.selectedRightDrawer({
-              req: RightDrawer.RoomUser,
+              req: RightDrawer.RoomUser
            })
          );
        }
@ -841,8 +841,8 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
              title: 'Edit Chat Member',
              curRoomUser: this.userInfoList.filter(
                user => user.seq !== this.loginRes.userSeq
-              ),
-            },
+              )
+            }
          });

          if (!!result && !!result.choice && result.choice) {
@ -864,8 +864,8 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
                RoomStore.inviteOrOpen({
                  req: {
                    divCd: 'Invite',
-                    userSeqs,
-                  },
+                    userSeqs
+                  }
                })
              );
            }
@ -881,8 +881,8 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
          >(SelectGroupDialogComponent, {
            width: '600px',
            data: {
-              title: 'Group Select',
-            },
+              title: 'Group Select'
+            }
          });

          if (!!result && !!result.choice && result.choice) {
@ -899,7 +899,7 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
              this.store.dispatch(
                SyncStore.updateGroupMember({
                  oldGroup,
-                  trgtUserSeq,
+                  trgtUserSeq
                })
              );
            }
@ -916,8 +916,8 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
            width: '600px',
            data: {
              title: 'Edit Chat Room',
-              roomInfo: this.roomInfo,
-            },
+              roomInfo: this.roomInfo
+            }
          });

          if (!!result && !!result.choice && result.choice) {
@ -934,8 +934,8 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
                  roomName,
                  receiveAlarm: roomInfo.receiveAlarm,
                  syncAll:
-                    roomNameChangeTarget.toUpperCase() === 'ALL' ? true : false,
-                },
+                    roomNameChangeTarget.toUpperCase() === 'ALL' ? true : false
+                }
              })
            );

@ -947,7 +947,7 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
              this.store.dispatch(
                RoomStore.updateTimeRoomInterval({
                  roomSeq: roomInfo.roomSeq,
-                  timerInterval: timeRoomInterval,
+                  timerInterval: timeRoomInterval
                })
              );
            }
--- a/projects/ucap-webmessenger-ui-chat/src/lib/components/messages.component.html
+++ b/projects/ucap-webmessenger-ui-chat/src/lib/components/messages.component.html
@ -1,4 +1,4 @@
-<div class="chat-messages">
+<div class="chat-messages" #scrollMe>
  <!-- <div class="message-row" *ngIf="eventRemain">
    <button mat-button (click)="onClickMore($event)">이전 대화 보기</button>
  </div> -->
--- a/projects/ucap-webmessenger-ui-organization/src/lib/components/tree.component.html
+++ b/projects/ucap-webmessenger-ui-organization/src/lib/components/tree.component.html
@ -1,17 +1,27 @@
+<cdk-virtual-scroll-viewport #cvsvOrganization itemSize="48" fxFlexFill>
+  <ng-container
+    *cdkVirtualFor="let node of dataSource.expandedData$"
+  ></ng-container>
  <mat-tree
    #orgranizationTree
    [dataSource]="dataSource"
    [treeControl]="treeControl"
    class="organization-tree"
  >
-  <mat-nested-tree-node *matTreeNodeDef="let node">
+    <!-- This is the tree node template for leaf nodes -->
+    <mat-tree-node *matTreeNodeDef="let node" matTreeNodePadding>
      <li>
        <div class="mat-tree-node" (click)="onClickNode(node)">
-        {{ node.title }}
+          {{ node.name }}
        </div>
      </li>
-  </mat-nested-tree-node>
-  <mat-nested-tree-node *matTreeNodeDef="let node; when: hasChildren" class="tree-node-frame">
+    </mat-tree-node>
+    <!-- This is the tree node template for expandable nodes -->
+    <mat-tree-node
+      *matTreeNodeDef="let node; when: hasChild"
+      matTreeNodePadding
+      class="tree-node-frame"
+    >
      <li>
        <div class="mat-tree-node" (click)="onClickNode(node)" class="path">
          <span class="horizontal-line"></span>
@ -26,10 +36,12 @@
              {{ treeControl.isExpanded(node) ? 'remove' : 'add' }}
            </mat-icon>
          </button>
-        <span class="dept-name">{{ node.title }}</span>
+          <span class="dept-name">{{ node.name }}</span>
        </div>
        <ul
-        [class.organization-tree-node-invisible]="!treeControl.isExpanded(node)"
+          [class.organization-tree-node-invisible]="
+            !treeControl.isExpanded(node)
+          "
        >
          <div *ngIf="treeControl.isExpanded(node)" class="boxnone">
            <div class="vertical-line"></div>
@ -37,5 +49,6 @@
          </div>
        </ul>
      </li>
-  </mat-nested-tree-node>
+    </mat-tree-node>
  </mat-tree>
+</cdk-virtual-scroll-viewport>
--- a/projects/ucap-webmessenger-ui-organization/src/lib/components/tree.component.scss
+++ b/projects/ucap-webmessenger-ui-organization/src/lib/components/tree.component.scss
@ -42,14 +42,14 @@ ul .tree-node-frame li .path > .horizontal-line{
 .boxnone {
  position: relative;
  .vertical-line {
-    background: rgba(189,189,189,.4);
+    background: rgba(189, 189, 189, 0.4);
    bottom: 6px;
    display: block;
    position: absolute;
    top: 0px;
    width: 2px;
  }
-  .mat-nested-tree-node:last-child{
+  .mat-tree-node:last-child {
    padding-bottom: 10px;
  }
 }
--- a/projects/ucap-webmessenger-ui-organization/src/lib/components/tree.component.ts
+++ b/projects/ucap-webmessenger-ui-organization/src/lib/components/tree.component.ts
@ -8,39 +8,26 @@ import {
  EventEmitter,
  AfterViewInit
 } from '@angular/core';
-import { MatTreeNestedDataSource, MatTree } from '@angular/material';
-import { NestedTreeControl } from '@angular/cdk/tree';
-import { BehaviorSubject } from 'rxjs';
+import { MatTreeFlattener, MatTree } from '@angular/material';
 import { NGXLogger } from 'ngx-logger';

 import { DeptInfo } from '@ucap-webmessenger/protocol-query';
 import { LoginResponse } from '@ucap-webmessenger/protocol-authentication';
+import { FlatTreeControl } from '@angular/cdk/tree';
+import { CdkVirtualScrollViewport } from '@angular/cdk/scrolling';
+import { VirtualScrollTreeFlatDataSource } from '@ucap-webmessenger/ui';

-export class OraganizationNode {
-  private childNodeBehaviorSubject: BehaviorSubject<OraganizationNode[]>;
-  private childNodeList: OraganizationNode[];
-
-  get title(): string {
-    return this.deptInfo.name;
+interface OrganizationNode {
+  deptInfo: DeptInfo;
+  name: string;
+  children?: OrganizationNode[];
 }

-  get children(): BehaviorSubject<OraganizationNode[]> {
-    if (!this.childNodeBehaviorSubject) {
-      this.childNodeBehaviorSubject = new BehaviorSubject(
-        undefined === this.childNodeList ? [] : this.childNodeList
-      );
-    }
-    return this.childNodeBehaviorSubject;
-  }
-
-  constructor(public deptInfo: DeptInfo) {}
-
-  addChild(childNode: OraganizationNode) {
-    if (!this.childNodeList) {
-      this.childNodeList = [];
-    }
-    this.childNodeList.push(childNode);
-  }
+/** Flat node with expandable and level information */
+interface FlatNode {
+  expandable: boolean;
+  name: string;
+  level: number;
 }

@Component({
@ -55,87 +42,96 @@ export class TreeComponent implements OnInit, AfterViewInit {
  @Input()
  loginRes: LoginResponse;
  @Input()
-  set oraganizationList(deptInfo: DeptInfo[]) {
-    const nodeMap = new Map<number, OraganizationNode>();
-    const rootNodeList: OraganizationNode[] = [];
-    const remainChildNodeList: OraganizationNode[] = [];
-    let myNode: OraganizationNode;
-
-    deptInfo.forEach(value => {
-      const node = new OraganizationNode(value);
-      if (nodeMap.has(value.seq)) {
-        this.logger.warn('duplicate seq', value.seq);
+  set oraganizationList(deptInfoList: DeptInfo[]) {
+    if (!deptInfoList || 0 === deptInfoList.length) {
      return;
    }
-      nodeMap.set(value.seq, node);
+    const nodeMap = new Map<number, OrganizationNode>();
+    const rootNodeList: OrganizationNode[] = [];
+    const remainChildNodeList: OrganizationNode[] = [];
+    let myNode: OrganizationNode;

-      if (value.seq === this.loginRes.departmentCode) {
+    deptInfoList.forEach(deptInfo => {
+      const node: OrganizationNode = {
+        deptInfo,
+        name: deptInfo.name,
+        children: []
+      };
+      if (nodeMap.has(deptInfo.seq)) {
+        this.logger.warn('duplicate seq', deptInfo.seq);
+        return;
+      }
+      nodeMap.set(deptInfo.seq, node);
+
+      if (deptInfo.seq === this.loginRes.departmentCode) {
        myNode = node;
      }

-      if (0 === value.parentSeq) {
+      if (0 === deptInfo.parentSeq) {
        rootNodeList.push(node);
        return;
      }

-      if (nodeMap.has(value.parentSeq)) {
-        nodeMap.get(value.parentSeq).addChild(node);
+      if (nodeMap.has(deptInfo.parentSeq)) {
+        nodeMap.get(deptInfo.parentSeq).children.push(node);
      } else {
        remainChildNodeList.push(node);
      }
    });

-    remainChildNodeList.forEach(value => {
-      if (nodeMap.has(value.deptInfo.parentSeq)) {
-        nodeMap.get(value.deptInfo.parentSeq).addChild(value);
+    remainChildNodeList.forEach(node => {
+      if (nodeMap.has(node.deptInfo.parentSeq)) {
+        nodeMap.get(node.deptInfo.parentSeq).children.push(node);
      }
    });
-
    this.dataSource.data = rootNodeList;
-    // console.log('myNode', myNode);
-    // console.log('this.dataSource.data', this.dataSource.data[0]);
-    // this.treeControl.expandDescendants(this.dataSource.data[2]);
-    // console.log('this.dataSource', this.dataSource);
-    // console.log('this.dataSource.data', this.dataSource.data);
-    // console.log('this.treeControl', this.treeControl);
-    // console.log('this.treeControl.dataNodes', this.treeControl.dataNodes);
-
-    // const myNode = this.treeControl.dataNodes.filter(
-    //   node => node.deptInfo.seq === this.loginRes.departmentCode
-    // );
-    // if (!!myNode && myNode.length > 0) {
-    //   this.treeControl.expand(myNode[0]);
-    // }
  }

-  @ViewChild('orgranizationTree', { static: true })
-  orgranizationTree: MatTree<OraganizationNode>;
+  @ViewChild('cvsvOrganization', { static: false })
+  cvsvOrganization: CdkVirtualScrollViewport;

-  levels = new Map<OraganizationNode, number>();
-  treeControl: NestedTreeControl<OraganizationNode>;
+  @ViewChild('orgranizationTree', { static: false })
+  orgranizationTree: MatTree<OrganizationNode>;

-  dataSource: MatTreeNestedDataSource<OraganizationNode>;
+  treeControl: FlatTreeControl<FlatNode>;
+  treeFlattener: MatTreeFlattener<OrganizationNode, FlatNode>;
+  dataSource: VirtualScrollTreeFlatDataSource<OrganizationNode, FlatNode>;

  constructor(
    private changeDetectorRef: ChangeDetectorRef,
    private logger: NGXLogger
  ) {
-    this.treeControl = new NestedTreeControl<OraganizationNode>(
-      this.getChildren
+    this.treeControl = new FlatTreeControl<FlatNode>(
+      node => node.level,
+      node => node.expandable
    );
-    this.dataSource = new MatTreeNestedDataSource();
+    this.treeFlattener = new MatTreeFlattener<OrganizationNode, FlatNode>(
+      (node: OrganizationNode, level: number) => {
+        return {
+          expandable: !!node.children && node.children.length > 0,
+          name: node.name,
+          level
+        };
+      },
+      node => node.level,
+      node => node.expandable,
+      node => node.children
+    );
+    this.dataSource = new VirtualScrollTreeFlatDataSource<
+      OrganizationNode,
+      FlatNode
+    >(this.treeControl, this.treeFlattener);
  }

  ngOnInit() {}

-  ngAfterViewInit(): void {}
+  ngAfterViewInit(): void {
+    this.dataSource.cdkVirtualScrollViewport = this.cvsvOrganization;
+  }

-  getChildren = (node: OraganizationNode) => node.children;
+  hasChild = (_: number, node: FlatNode) => node.expandable;

-  hasChildren = (index: number, node: OraganizationNode) =>
-    0 < node.children.value.length;
-
-  onClickNode(node: OraganizationNode) {
+  onClickNode(node: OrganizationNode) {
    this.selected.emit(node.deptInfo);
  }
 }
--- a/projects/ucap-webmessenger-ui-organization/src/lib/ucap-ui-organization.module.ts
+++ b/projects/ucap-webmessenger-ui-organization/src/lib/ucap-ui-organization.module.ts
@ -2,6 +2,8 @@ import { NgModule, ModuleWithProviders } from '@angular/core';
 import { CommonModule } from '@angular/common';
 import { ReactiveFormsModule } from '@angular/forms';

+import { FlexLayoutModule } from '@angular/flex-layout';
+
 import { ScrollingModule } from '@angular/cdk/scrolling';

 import { MatButtonModule } from '@angular/material/button';
@ -21,6 +23,7 @@ const SERVICES = [];
    CommonModule,
    ReactiveFormsModule,

+    FlexLayoutModule,
    ScrollingModule,

    MatButtonModule,
--- a/projects/ucap-webmessenger-ui/src/lib/data-source/virtual-scroll-tree-flat.data-source.ts
+++ b/projects/ucap-webmessenger-ui/src/lib/data-source/virtual-scroll-tree-flat.data-source.ts
@ -0,0 +1,126 @@
+import { CollectionViewer, DataSource } from '@angular/cdk/collections';
+import { FlatTreeControl } from '@angular/cdk/tree';
+import {
+  BehaviorSubject,
+  merge,
+  Observable,
+  Subject,
+  Subscription
+} from 'rxjs';
+import { map, share } from 'rxjs/operators';
+import { MatTreeFlattener } from '@angular/material';
+import { CdkVirtualScrollViewport } from '@angular/cdk/scrolling';
+
+export class VirtualScrollTreeFlatDataSource<T, F> extends DataSource<F> {
+  private flattenedDataSubject = new BehaviorSubject<F[]>([]);
+
+  private expandedDataSubject = new BehaviorSubject<F[]>([]);
+  expandedData$: Observable<F[]>;
+
+  private connectSubject: Subject<F[]>;
+  private dataChangeSubscription: Subscription;
+  private rangeChangeSubscription: Subscription;
+
+  private rangeSubject: BehaviorSubject<{
+    start: number;
+    end: number;
+  }>;
+
+  // tslint:disable-next-line: variable-name
+  private _cdkVirtualScrollViewport: CdkVirtualScrollViewport;
+  set cdkVirtualScrollViewport(
+    cdkVirtualScrollViewport: CdkVirtualScrollViewport
+  ) {
+    if (!cdkVirtualScrollViewport) {
+      return;
+    }
+    this._cdkVirtualScrollViewport = cdkVirtualScrollViewport;
+    this.rangeSubject = new BehaviorSubject<{ start: number; end: number }>({
+      start: 0,
+      end: 1
+    });
+
+    this.rangeChangeSubscription = cdkVirtualScrollViewport.renderedRangeStream.subscribe(
+      range => {
+        this.rangeSubject.next({
+          start: range.start,
+          end: range.end
+        });
+        if (!!this.connectSubject) {
+          this.connectSubject.next(
+            this.expandedDataSubject.value.slice(
+              this.rangeSubject.value.start,
+              this.rangeSubject.value.end
+            )
+          );
+        }
+      }
+    );
+  }
+
+  // tslint:disable-next-line: variable-name
+  private _data: BehaviorSubject<T[]>;
+  get data() {
+    return this._data.value;
+  }
+  set data(value: T[]) {
+    this._data.next(value);
+    this.flattenedDataSubject.next(this.treeFlattener.flattenNodes(this.data));
+    this.treeControl.dataNodes = this.flattenedDataSubject.value;
+  }
+
+  constructor(
+    private treeControl: FlatTreeControl<F>,
+    private treeFlattener: MatTreeFlattener<T, F>,
+    initialData: T[] = []
+  ) {
+    super();
+    this._data = new BehaviorSubject<T[]>(initialData);
+    this.expandedData$ = this.expandedDataSubject.asObservable().pipe(share());
+  }
+
+  connect(collectionViewer: CollectionViewer): Observable<F[]> {
+    this.connectSubject = new Subject<F[]>();
+
+    this.dataChangeSubscription = merge(
+      collectionViewer.viewChange,
+      this.treeControl.expansionModel.changed,
+      this.flattenedDataSubject
+    )
+      .pipe(
+        map(() => {
+          this.expandedDataSubject.next(
+            this.treeFlattener.expandFlattenedNodes(
+              this.flattenedDataSubject.value,
+              this.treeControl
+            )
+          );
+
+          return !this.rangeSubject
+            ? this.expandedDataSubject.value
+            : this.expandedDataSubject.value.slice(
+                this.rangeSubject.value.start,
+                this.rangeSubject.value.end
+              );
+        })
+      )
+      .subscribe(datas => {
+        this.connectSubject.next(datas);
+        if (!!this._cdkVirtualScrollViewport) {
+          this._cdkVirtualScrollViewport.checkViewportSize();
+        }
+      });
+
+    return this.connectSubject.asObservable();
+  }
+
+  disconnect() {
+    if (!!this.dataChangeSubscription) {
+      this.dataChangeSubscription.unsubscribe();
+    }
+
+    if (!!this.rangeChangeSubscription) {
+      this.rangeChangeSubscription.unsubscribe();
+    }
+  }
+}
--- a/projects/ucap-webmessenger-ui/src/public-api.ts
+++ b/projects/ucap-webmessenger-ui/src/public-api.ts
@ -13,6 +13,8 @@ export * from './lib/components/file-upload-queue.component';
 export * from './lib/components/file-viewer.component';
 export * from './lib/components/float-action-button.component';

+export * from './lib/data-source/virtual-scroll-tree-flat.data-source';
+
 export * from './lib/dialogs/alert.dialog.component';
 export * from './lib/dialogs/confirm.dialog.component';