From 8ea84d577642bea4f379cd2d2cff6fe0f207681c Mon Sep 17 00:00:00 2001
From: AleksanderBodurri <alex.bodurri@mail.utoronto.ca>
Date: Fri, 20 Mar 2020 13:24:22 -0400
Subject: [PATCH] feat(devtools): implement input/output/state preview
 functionality with the reworked property explorer

---
 cypress/integration/node-search.e2e.js        |  2 +-
 .../directive-explorer.component.ts           |  3 +-
 .../directive-property-resolver.ts            | 29 ++++++----
 .../property-resolver/property-data-source.ts | 55 ++++++++++++-------
 .../property-view-body.component.ts           | 13 ++++-
 .../property-view-tree.component.css          | 50 +++++++++++++++++
 .../property-view-tree.component.html         | 32 +++++++++++
 .../property-view-tree.component.ts           | 49 +++++++++++++++++
 .../property-view-header.component.css        |  6 +-
 .../property-view-header.component.html       | 13 ++++-
 .../property-view-header.component.ts         |  9 +++
 .../property-view.component.html              |  7 ++-
 .../property-view/property-view.component.ts  | 54 ++++++++++++++++--
 .../property-view/property-view.module.ts     | 12 +++-
 .../property-tab/property-tab.component.ts    |  3 +-
 15 files changed, 289 insertions(+), 48 deletions(-)
 create mode 100644 projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view-body/property-view-tree/property-view-tree.component.css
 create mode 100644 projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view-body/property-view-tree/property-view-tree.component.html
 create mode 100644 projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view-body/property-view-tree/property-view-tree.component.ts

diff --git a/cypress/integration/node-search.e2e.js b/cypress/integration/node-search.e2e.js
index b3fa0ed4dec..145577ffbf6 100644
--- a/cypress/integration/node-search.e2e.js
+++ b/cypress/integration/node-search.e2e.js
@@ -86,7 +86,7 @@ describe('Search items in component tree', () => {
     checkComponentName('app-todos');
 
     // should display correct title for properties panel
-    cy.get('header').should('have.text', ' Properties of app-todos ');
+    cy.get('header span').should('have.text', ' Properties of app-todos ');
 
     // should show correct component properties
     cy.get('ng-property-view').find('mat-tree-node');
diff --git a/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/directive-explorer.component.ts b/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/directive-explorer.component.ts
index 4fbe4303221..cc7dd51b660 100644
--- a/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/directive-explorer.component.ts
+++ b/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/directive-explorer.component.ts
@@ -46,7 +46,6 @@ const sameDirectives = (a: IndexedNode, b: IndexedNode) => {
   ],
 })
 export class DirectiveExplorerComponent implements OnInit {
-  directivesData: DirectivesProperties | null = null;
   currentSelectedElement: IndexedNode | null = null;
   forest: DevToolsNode[];
   highlightIDinTreeFromElement: ElementPosition | null = null;
@@ -189,7 +188,7 @@ export class DirectiveExplorerComponent implements OnInit {
       let data = {};
       const controller = this._propResolver.getDirectiveController(directive);
       if (controller) {
-        data = controller.getDirectiveProperties();
+        data = controller.directiveProperties;
       }
       if (!e.clipboardData) {
         return;
diff --git a/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-resolver/directive-property-resolver.ts b/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-resolver/directive-property-resolver.ts
index 293bfda54cc..6e7c7b10171 100644
--- a/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-resolver/directive-property-resolver.ts
+++ b/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-resolver/directive-property-resolver.ts
@@ -6,6 +6,12 @@ import { getExpandedDirectiveProperties } from './property-expanded-directive-pr
 import { Observable } from 'rxjs';
 import { Property, FlatNode } from './element-property-resolver';
 
+export enum PropertyViewFilterOptions {
+  INPUTS,
+  OUTPUTS,
+  STATE,
+}
+
 const expandable = (prop: Descriptor) => {
   if (!prop) {
     return false;
@@ -60,10 +66,18 @@ export class DirectivePropertyResolver {
     };
   }
 
-  getDirectiveProperties(): { [name: string]: Descriptor } {
+  get directiveProperties(): { [name: string]: Descriptor } {
     return this._props.props;
   }
 
+  get directiveInputs(): string[] {
+    return Object.keys(this._props.inputs || {});
+  }
+
+  get directiveOutputs(): string[] {
+    return Object.keys(this._props.outputs || {});
+  }
+
   getExpandedProperties(): NestedProp[] {
     return getExpandedDirectiveProperties(this._dataSource.data);
   }
@@ -91,7 +105,10 @@ export class DirectivePropertyResolver {
 
   private _getChildren(prop: Property): Property[] | undefined {
     const descriptor = prop.descriptor;
-    if (descriptor.type === PropType.Object && !(descriptor.value instanceof Observable)) {
+    if (
+      (descriptor.type === PropType.Object || descriptor.type === PropType.Array) &&
+      !(descriptor.value instanceof Observable)
+    ) {
       return Object.keys(descriptor.value || {}).map(name => {
         return {
           name,
@@ -99,14 +116,6 @@ export class DirectivePropertyResolver {
           parent: prop,
         };
       });
-    } else if (descriptor.type === PropType.Array && !(descriptor.value instanceof Observable)) {
-      return (descriptor.value || []).map((el: Descriptor, idx: number) => {
-        return {
-          name: idx.toString(),
-          descriptor: el,
-          parent: prop,
-        };
-      });
     } else {
       console.error('Unexpected data type', descriptor, 'in property', prop);
     }
diff --git a/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-resolver/property-data-source.ts b/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-resolver/property-data-source.ts
index f22a16c9519..8360062c073 100644
--- a/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-resolver/property-data-source.ts
+++ b/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-resolver/property-data-source.ts
@@ -7,6 +7,20 @@ import { map } from 'rxjs/operators';
 import { DefaultIterableDiffer } from '@angular/core';
 import { diff } from '../../diffing';
 import { FlatNode, Property } from './element-property-resolver';
+import { PropertyViewFilterOptions } from './directive-property-resolver';
+
+const expandable = (prop: Descriptor, messageBus?: MessageBus<Events>) => {
+  if (!prop) {
+    return false;
+  }
+  if (!prop.value && !messageBus) {
+    return false;
+  }
+  if (!prop.expandable) {
+    return false;
+  }
+  return !(prop.type !== PropType.Object && prop.type !== PropType.Array);
+};
 
 const trackBy = (_: number, item: FlatNode) => {
   return `#${item.prop.name}#${item.level}`;
@@ -18,6 +32,8 @@ export class PropertyDataSource extends DataSource<FlatNode> {
   private _expandedData = new BehaviorSubject<FlatNode[]>([]);
   private _differ = new DefaultIterableDiffer(trackBy);
 
+  private readonly _originalData: FlatNode[];
+
   constructor(
     props: { [prop: string]: Descriptor },
     private _treeFlattener: MatTreeFlattener<Property, FlatNode>,
@@ -28,7 +44,8 @@ export class PropertyDataSource extends DataSource<FlatNode> {
     private _onReceivedNestedProperties: () => void
   ) {
     super();
-    this._data.next(this._treeFlattener.flattenNodes(this._arrayify(props)));
+    this._originalData = this._treeFlattener.flattenNodes(this._arrayify(props));
+    this._data.next(this._originalData);
   }
 
   get data(): FlatNode[] {
@@ -110,25 +127,23 @@ export class PropertyDataSource extends DataSource<FlatNode> {
     });
   }
 
-  private _getChildren(prop: Property): Property[] {
-    const descriptor = prop.descriptor;
-    if (descriptor.type === PropType.Object && !(descriptor.value instanceof Observable)) {
-      return Object.keys(descriptor.value || {}).map(name => {
-        return {
-          name,
-          descriptor: descriptor.value ? descriptor.value[name] : null,
-          parent: prop,
-        };
-      });
-    } else if (descriptor.type === PropType.Array && !(descriptor.value instanceof Observable)) {
-      return (descriptor.value || []).map((el: Descriptor, idx: number) => {
-        return {
-          name: idx.toString(),
-          descriptor: el,
-          parent: prop,
-        };
-      });
+  filterDataSource(filter: string[] | null): void {
+    if (filter === null) {
+      return;
     }
-    throw new Error('Unexpected data type');
+    let pushFlag = false;
+    const filteredData: FlatNode[] = [];
+
+    // tslint:disable-next-line:prefer-for-of
+    for (let i = 0; i < this._originalData.length; i++) {
+      const node = this._originalData[i];
+      if (node.level === 0) {
+        pushFlag = filter.includes(node.prop.name);
+      }
+      if (pushFlag) {
+        filteredData.push(node);
+      }
+    }
+    this._data.next(filteredData);
   }
 }
diff --git a/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view-body/property-view-body.component.ts b/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view-body/property-view-body.component.ts
index 032a6cc0455..040d3a7a460 100644
--- a/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view-body/property-view-body.component.ts
+++ b/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view-body/property-view-body.component.ts
@@ -1,4 +1,4 @@
-import { Component, Input } from '@angular/core';
+import { Component, Input, OnChanges, OnInit } from '@angular/core';
 import { FlatTreeControl } from '@angular/cdk/tree';
 import { PropertyDataSource } from '../../../../property-resolver/property-data-source';
 import { FlatNode } from '../../../../property-resolver/element-property-resolver';
@@ -9,13 +9,22 @@ import { DirectivePropertyResolver } from '../../../../property-resolver/directi
   templateUrl: './property-view-body.component.html',
   styleUrls: ['./property-view-body.component.css'],
 })
-export class PropertyViewBodyComponent {
+export class PropertyViewBodyComponent implements OnChanges {
   @Input() dataSource: PropertyDataSource;
   @Input() treeControl: FlatTreeControl<FlatNode>;
   @Input() controller: DirectivePropertyResolver;
+  @Input() filterList: string[] | null = null;
 
   hasChild = (_: number, node: FlatNode): boolean => node.expandable;
 
+  ngOnChanges(): void {
+    this.filterTreeNodes();
+  }
+
+  filterTreeNodes(): void {
+    this.dataSource.filterDataSource(this.filterList);
+  }
+
   toggle(node: FlatNode): void {
     if (this.treeControl.isExpanded(node)) {
       this.treeControl.collapse(node);
diff --git a/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view-body/property-view-tree/property-view-tree.component.css b/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view-body/property-view-tree/property-view-tree.component.css
new file mode 100644
index 00000000000..cf79f806120
--- /dev/null
+++ b/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view-body/property-view-tree/property-view-tree.component.css
@@ -0,0 +1,50 @@
+:host {
+  width: 325px;
+  display: block;
+  overflow: auto;
+  height: calc(100% - 24px);
+}
+:host mat-tree {
+  display: table;
+}
+.name {
+  margin-left: -9px;
+}
+.non-expandable {
+  margin-left: 13px;
+}
+.property-list {
+  margin: 5px;
+  margin-left: 15px;
+}
+.property-list mat-tree-node .name {
+  color: #b82519;
+}
+.property-list mat-tree-node.disabled .name,
+.disabled {
+  color: #333;
+}
+
+.arrow {
+  font-family: monospace;
+  font-size: 7px;
+  color: #6e6e6e;
+}
+
+:host /deep/ .mat-tree-node .mat-icon {
+  font-size: 12px;
+  width: 16px;
+  height: 16px;
+}
+
+:host /deep/ .mat-tree-node {
+  min-height: 20px !important;
+  cursor: default;
+  font-family: Menlo, monospace;
+  border-radius: 5px;
+}
+
+:host /deep/ .mat-tree-node,
+.mat-nested-tree-node {
+  font-size: 11px;
+}
diff --git a/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view-body/property-view-tree/property-view-tree.component.html b/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view-body/property-view-tree/property-view-tree.component.html
new file mode 100644
index 00000000000..a530ef1ac51
--- /dev/null
+++ b/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view-body/property-view-tree/property-view-tree.component.html
@@ -0,0 +1,32 @@
+<mat-tree *ngIf="_treeControl" class="property-list" [dataSource]="_dataSource" [treeControl]="_treeControl">
+  <mat-tree-node matTreeNodePaddingIndent="14" *matTreeNodeDef="let node" matTreeNodePadding>
+    <span class="name non-expandable"> {{ node.prop.name }} </span>:&nbsp;
+    <ng-container *ngIf="!node.prop.descriptor.editable; else editable">
+      <span class="value">
+        {{ node.prop.descriptor.preview }}
+      </span>
+    </ng-container>
+    <ng-template #editable>
+      <ng-property-editor
+        [key]="node.prop.name"
+        [initialValue]="node.prop.descriptor.value || node.prop.descriptor.preview"
+        (updateValue)="handleUpdate(node, $event)"
+      >
+      </ng-property-editor>
+    </ng-template>
+  </mat-tree-node>
+
+  <mat-tree-node matTreeNodePaddingIndent="14" *matTreeNodeDef="let node; when: hasChild" matTreeNodePadding>
+    LOL
+    <div (click)="toggle(node)">
+      <span class="arrow">
+        {{ _treeControl.isExpanded(node) ? '▼' : '►' }}
+      </span>
+      &nbsp;
+      <span class="name"> {{ node.prop.name }} </span>:&nbsp;
+      <span class="value">
+        {{ _treeControl.isExpanded(node) ? '' : node.prop.descriptor.preview }}
+      </span>
+    </div>
+  </mat-tree-node>
+</mat-tree>
diff --git a/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view-body/property-view-tree/property-view-tree.component.ts b/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view-body/property-view-tree/property-view-tree.component.ts
new file mode 100644
index 00000000000..7135b5b754b
--- /dev/null
+++ b/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view-body/property-view-tree/property-view-tree.component.ts
@@ -0,0 +1,49 @@
+import { Component, EventEmitter, Input, Output } from '@angular/core';
+import { PropertyDataSource } from '../../../../../property-resolver/property-data-source';
+import { FlatNode } from '../../../../../property-resolver/element-property-resolver';
+import { UpdateEvent } from '../property-view-body.component';
+import { FlatTreeControl } from '@angular/cdk/tree';
+
+@Component({
+  selector: 'ng-property-view-tree',
+  templateUrl: './property-view-tree.component.html',
+  styleUrls: ['./property-view-tree.component.css'],
+})
+export class PropertyViewTreeComponent {
+  @Input() set dataSource(dataSource: PropertyDataSource) {
+    this._dataSource = dataSource;
+    this._treeControl = dataSource.getTreeControl();
+  }
+  @Output() updateValue = new EventEmitter<UpdateEvent>();
+
+  _dataSource: PropertyDataSource;
+  _treeControl: FlatTreeControl<FlatNode>;
+
+  hasChild = (_: number, node: FlatNode): boolean => {
+    debugger;
+    return node.expandable;
+  };
+
+  toggle(node: FlatNode): void {
+    if (this._treeControl.isExpanded(node)) {
+      this._treeControl.collapse(node);
+      return;
+    }
+    this.expand(node);
+  }
+
+  expand(node: FlatNode): void {
+    const { prop } = node;
+    if (!prop.descriptor.expandable) {
+      return;
+    }
+    this._treeControl.expand(node);
+  }
+
+  handleUpdate(node: FlatNode, updatedValue: any): void {
+    this.updateValue.emit({
+      node,
+      updatedValue,
+    });
+  }
+}
diff --git a/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view-header/property-view-header.component.css b/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view-header/property-view-header.component.css
index 0ca72dc5263..4434ea78467 100644
--- a/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view-header/property-view-header.component.css
+++ b/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view-header/property-view-header.component.css
@@ -1,4 +1,4 @@
-.explorer-panel header {
+header {
   background-color: #eee;
   padding-left: 9px;
   border-top: 1px solid #ccc;
@@ -22,3 +22,7 @@
   line-height: 15px;
   margin-right: 7px;
 }
+
+:host /deep/ .mat-button-toggle-appearance-standard .mat-button-toggle-label-content {
+  line-height: 25px;
+}
diff --git a/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view-header/property-view-header.component.html b/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view-header/property-view-header.component.html
index 83e2ef22f40..01e6d991f0b 100644
--- a/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view-header/property-view-header.component.html
+++ b/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view-header/property-view-header.component.html
@@ -1,5 +1,16 @@
 <header>
-  Properties of {{ directive }}
+  <span> Properties of {{ directive }} </span>
+  <mat-button-toggle-group [multiple]="true" (change)="filterProperties($event)">
+    <mat-button-toggle [value]="cmpFilterOptions.INPUTS" [checked]="true">
+      Inputs
+    </mat-button-toggle>
+    <mat-button-toggle [value]="cmpFilterOptions.OUTPUTS" [checked]="true">
+      Outputs
+    </mat-button-toggle>
+    <mat-button-toggle [value]="cmpFilterOptions.STATE" [checked]="true">
+      State
+    </mat-button-toggle>
+  </mat-button-toggle-group>
   <button mat-icon-button (click)="copyPropData.emit(directive)">
     <svg
       xmlns="http://www.w3.org/2000/svg"
diff --git a/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view-header/property-view-header.component.ts b/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view-header/property-view-header.component.ts
index 37d20809005..c32fbc12d45 100644
--- a/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view-header/property-view-header.component.ts
+++ b/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view-header/property-view-header.component.ts
@@ -1,4 +1,6 @@
 import { Component, EventEmitter, Input, Output } from '@angular/core';
+import { MatButtonToggleChange } from '@angular/material/button-toggle';
+import { PropertyViewFilterOptions } from '../../../../property-resolver/directive-property-resolver';
 
 @Component({
   selector: 'ng-property-view-header',
@@ -7,5 +9,12 @@ import { Component, EventEmitter, Input, Output } from '@angular/core';
 })
 export class PropertyViewHeaderComponent {
   @Input() directive: string;
+  @Output() filter = new EventEmitter<PropertyViewFilterOptions[]>();
   @Output() copyPropData = new EventEmitter<string>();
+
+  cmpFilterOptions = PropertyViewFilterOptions;
+
+  filterProperties(event: MatButtonToggleChange): void {
+    this.filter.emit(event.value);
+  }
 }
diff --git a/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view.component.html b/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view.component.html
index 8494d8499a2..19b4ebbc987 100644
--- a/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view.component.html
+++ b/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view.component.html
@@ -1,6 +1,11 @@
-<ng-property-view-header [directive]="directive" (copyPropData)="copyPropData.emit($event)"></ng-property-view-header>
+<ng-property-view-header
+  [directive]="directive"
+  (copyPropData)="copyPropData.emit($event)"
+  (filter)="filter($event)"
+></ng-property-view-header>
 <ng-property-view-body
   [controller]="controller"
   [dataSource]="dataSource"
+  [filterList]="allowedList"
   [treeControl]="treeControl"
 ></ng-property-view-body>
diff --git a/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view.component.ts b/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view.component.ts
index a1cf45b8ea1..6c8f49c3e03 100644
--- a/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view.component.ts
+++ b/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view.component.ts
@@ -1,8 +1,11 @@
 import { Component, EventEmitter, Input, Output } from '@angular/core';
-import { DirectivePropertyResolver } from '../../../property-resolver/directive-property-resolver';
-import { FlatNode, PropertyDataSource } from '../../../property-resolver/property-data-source';
+import {
+  DirectivePropertyResolver,
+  PropertyViewFilterOptions,
+} from '../../../property-resolver/directive-property-resolver';
+import { PropertyDataSource } from '../../../property-resolver/property-data-source';
 import { TreeControl } from '@angular/cdk/tree';
-import { ElementPropertyResolver } from '../../../property-resolver/element-property-resolver';
+import { ElementPropertyResolver, FlatNode } from '../../../property-resolver/element-property-resolver';
 
 @Component({
   selector: 'ng-property-view',
@@ -13,17 +16,56 @@ export class PropertyViewComponent {
   @Input() directive: string;
   @Output() copyPropData = new EventEmitter<string>();
 
+  currentFilter: PropertyViewFilterOptions[] = [
+    PropertyViewFilterOptions.INPUTS,
+    PropertyViewFilterOptions.OUTPUTS,
+    PropertyViewFilterOptions.STATE,
+  ];
+  allowedList: string[] | null = null;
+
   constructor(private _nestedProps: ElementPropertyResolver) {}
 
-  get controller(): DirectivePropertyResolver {
+  get controller(): DirectivePropertyResolver | undefined {
     return this._nestedProps.getDirectiveController(this.directive);
   }
 
-  get dataSource(): PropertyDataSource {
+  get dataSource(): PropertyDataSource | void {
+    if (!this.controller) {
+      return;
+    }
     return this.controller.getDirectiveControls().dataSource;
   }
 
-  get treeControl(): TreeControl<FlatNode> {
+  get treeControl(): TreeControl<FlatNode> | void {
+    if (!this.controller) {
+      return;
+    }
     return this.controller.getDirectiveControls().treeControl;
   }
+
+  filter(evt: PropertyViewFilterOptions[]): void {
+    this.currentFilter = evt;
+    this.computeAllowedList();
+  }
+
+  computeAllowedList(): void {
+    if (!this.controller || !this.controller.directiveProperties) {
+      return;
+    }
+    const inputList = this.controller.directiveInputs;
+    const outputList = this.controller.directiveOutputs;
+    const stateList = Object.keys(this.controller.directiveProperties).filter(
+      prop => !inputList.includes(prop) && !outputList.includes(prop)
+    );
+    const propList = {
+      [PropertyViewFilterOptions.INPUTS]: inputList,
+      [PropertyViewFilterOptions.OUTPUTS]: outputList,
+      [PropertyViewFilterOptions.STATE]: stateList,
+    };
+
+    this.allowedList = [].concat.apply(
+      [],
+      this.currentFilter.map(filterOption => propList[filterOption])
+    );
+  }
 }
diff --git a/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view.module.ts b/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view.module.ts
index 1605c3a8376..a7b4321286c 100644
--- a/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view.module.ts
+++ b/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab-body/property-view/property-view.module.ts
@@ -5,10 +5,18 @@ import { MatTreeModule } from '@angular/material/tree';
 import { PropertyEditorModule } from './property-view-body/property-editor/property-editor.module';
 import { PropertyViewHeaderComponent } from './property-view-header/property-view-header.component';
 import { PropertyViewComponent } from './property-view.component';
+import { MatButtonModule } from '@angular/material/button';
+import { MatButtonToggleModule } from '@angular/material/button-toggle';
+import { PropertyViewTreeComponent } from './property-view-body/property-view-tree/property-view-tree.component';
 
 @NgModule({
-  declarations: [PropertyViewBodyComponent, PropertyViewHeaderComponent, PropertyViewComponent],
-  imports: [MatTreeModule, CommonModule, PropertyEditorModule],
+  declarations: [
+    PropertyViewBodyComponent,
+    PropertyViewHeaderComponent,
+    PropertyViewComponent,
+    PropertyViewTreeComponent,
+  ],
+  imports: [MatTreeModule, CommonModule, PropertyEditorModule, MatButtonModule, MatButtonToggleModule],
   exports: [PropertyViewBodyComponent, PropertyViewHeaderComponent, PropertyViewComponent],
 })
 export class PropertyViewModule {}
diff --git a/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab.component.ts b/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab.component.ts
index e6ab26abef1..eebb72075a8 100644
--- a/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab.component.ts
+++ b/projects/ng-devtools/src/lib/devtools-tabs/directive-explorer/property-tab/property-tab.component.ts
@@ -1,6 +1,5 @@
-import { ChangeDetectionStrategy, Component, EventEmitter, Input, Output, ViewChild } from '@angular/core';
+import { Component, EventEmitter, Input, Output, ViewChild } from '@angular/core';
 import { IndexedNode } from '../directive-forest/index-forest';
-import { Descriptor, DirectivesProperties, Events, MessageBus } from 'protocol';
 import { PropertyTabBodyComponent } from './property-tab-body/property-tab-body.component';
 
 @Component({