feat(scrollbar): add isScrollEnabled property (#6640)

tns-core-modules/ui/core/view/view.android.ts

@@ -31,7 +31,6 @@ const androidBackPressedEvent = "androidBackPressed";
 const modalMap = new Map<number, DialogOptions>();
 
 let TouchListener: TouchListener;
-let disableUserInteractionListener: org.nativescript.widgets.DisableUserInteractionListener;
 let DialogFragment: DialogFragment;
 
 interface DialogOptions {
@@ -50,14 +49,6 @@ interface DialogFragment {
     new(): android.support.v4.app.DialogFragment;
 }
 
-function initializeDisabledListener(): void {
-    if (disableUserInteractionListener) {
-        return;
-    }
-
-    disableUserInteractionListener = new org.nativescript.widgets.DisableUserInteractionListener();
-}
-
 function initializeTouchListener(): void {
     if (TouchListener) {
         return;
@@ -649,9 +640,8 @@ export class View extends ViewCommon {
     }
 
     [isUserInteractionEnabledProperty.setNative](value: boolean) {
-        if (this.nativeViewProtected.setClickable) {
+        this.nativeViewProtected.setClickable(value);
-            this.nativeViewProtected.setClickable(value);
+        this.nativeViewProtected.setFocusable(value);
-        }
     }
 
     [visibilityProperty.getDefault](): Visibility {

tns-core-modules/ui/scroll-view/scroll-view-common.ts

@@ -11,6 +11,7 @@ export abstract class ScrollViewBase extends ContentView implements ScrollViewDe
 
     public orientation: Orientation;
     public scrollBarIndicatorVisible: boolean;
+    public isScrollEnabled: boolean;
 
     public addEventListener(arg: string, callback: any, thisArg?: any) {
         super.addEventListener(arg, callback, thisArg);
@@ -103,3 +104,9 @@ export const scrollBarIndicatorVisibleProperty = new Property<ScrollViewBase, bo
     valueConverter: booleanConverter
 });
 scrollBarIndicatorVisibleProperty.register(ScrollViewBase);
+
+export const isScrollEnabledProperty = new Property<ScrollViewBase, boolean>({
+    name: "isScrollEnabled", defaultValue: true,
+    valueConverter: booleanConverter
+});
+isScrollEnabledProperty.register(ScrollViewBase);

tns-core-modules/ui/scroll-view/scroll-view.android.ts

@@ -1,5 +1,8 @@
 import { ScrollEventData } from ".";
-import { ScrollViewBase, layout, scrollBarIndicatorVisibleProperty } from "./scroll-view-common";
+import { 
+    ScrollViewBase, layout, scrollBarIndicatorVisibleProperty,
+    isUserInteractionEnabledProperty, isScrollEnabledProperty 
+} from "./scroll-view-common";
 
 export * from "./scroll-view-common";
 
@@ -44,6 +47,21 @@ export class ScrollView extends ScrollViewBase {
         return nativeView.getScrollableLength() / layout.getDisplayDensity();
     }
 
+    [isUserInteractionEnabledProperty.setNative](value: boolean) {
+        // NOTE: different behavior on iOS & Android: 
+        // iOS disables user interaction recursively for all subviews as well
+        this.nativeViewProtected.setClickable(value);
+        this.nativeViewProtected.setFocusable(value);
+        this.nativeViewProtected.setScrollEnabled(value);
+    }
+
+    [isScrollEnabledProperty.getDefault](): boolean {
+        return this.nativeViewProtected.getScrollEnabled();
+    }
+    [isScrollEnabledProperty.setNative](value: boolean) {
+        this.nativeViewProtected.setScrollEnabled(value);
+    }
+
     [scrollBarIndicatorVisibleProperty.getDefault](): boolean {
         return true;
     }
@@ -57,7 +75,7 @@ export class ScrollView extends ScrollViewBase {
 
     public scrollToVerticalOffset(value: number, animated: boolean) {
         const nativeView = this.nativeViewProtected;
-        if (nativeView && this.orientation === "vertical") {
+        if (nativeView && this.orientation === "vertical" && this.isScrollEnabled) {
             value *= layout.getDisplayDensity();
 
             if (animated) {
@@ -70,7 +88,7 @@ export class ScrollView extends ScrollViewBase {
 
     public scrollToHorizontalOffset(value: number, animated: boolean) {
         const nativeView = this.nativeViewProtected;
-        if (nativeView && this.orientation === "horizontal") {
+        if (nativeView && this.orientation === "horizontal" && this.isScrollEnabled) {
             value *= layout.getDisplayDensity();
 
             if (animated) {

tns-core-modules/ui/scroll-view/scroll-view.d.ts

@@ -14,6 +14,11 @@ export class ScrollView extends ContentView {
      */
     public static scrollEvent: string;
 
+    /**
+     * Gets or sets a value indicating whether scroll is enabled.
+     */
+    isScrollEnabled: boolean;
+
     /**
      * Gets a value that contains the vertical offset of the scrolled content.
      */

tns-core-modules/ui/scroll-view/scroll-view.ios.ts

@@ -1,5 +1,7 @@
 import { ScrollEventData } from ".";
-import { View, layout, ScrollViewBase, scrollBarIndicatorVisibleProperty } from "./scroll-view-common";
+import {
+    View, layout, ScrollViewBase, scrollBarIndicatorVisibleProperty, isScrollEnabledProperty
+} from "./scroll-view-common";
 import { ios as iosUtils } from "../../utils/utils";
 // HACK: Webpack. Use a fully-qualified import to allow resolve.extensions(.ios.js) to
 // kick in. `../utils` doesn't seem to trigger the webpack extensions mechanism.
@@ -99,6 +101,13 @@ export class ScrollView extends ScrollViewBase {
         return Math.max(0, this.nativeViewProtected.contentSize.height - this.nativeViewProtected.bounds.size.height);
     }
 
+    [isScrollEnabledProperty.getDefault](): boolean {
+        return this.nativeViewProtected.scrollEnabled;
+    }
+    [isScrollEnabledProperty.setNative](value: boolean) {
+        this.nativeViewProtected.scrollEnabled = value;
+    }
+
     [scrollBarIndicatorVisibleProperty.getDefault](): boolean {
         return true;
     }
@@ -107,14 +116,14 @@ export class ScrollView extends ScrollViewBase {
     }
 
     public scrollToVerticalOffset(value: number, animated: boolean) {
-        if (this.nativeViewProtected  && this.orientation === "vertical") {
+        if (this.nativeViewProtected && this.orientation === "vertical" && this.isScrollEnabled) {
             const bounds = this.nativeViewProtected.bounds.size;
             this.nativeViewProtected.scrollRectToVisibleAnimated(CGRectMake(0, value, bounds.width, bounds.height), animated);
         }
     }
 
     public scrollToHorizontalOffset(value: number, animated: boolean) {
-        if (this.nativeViewProtected  && this.orientation === "horizontal") {
+        if (this.nativeViewProtected && this.orientation === "horizontal" && this.isScrollEnabled) {
             const bounds = this.nativeViewProtected.bounds.size;
             this.nativeViewProtected.scrollRectToVisibleAnimated(CGRectMake(value, 0, bounds.width, bounds.height), animated);
         }

tns-platform-declarations/android/org.nativescript.widgets.d.ts

@@ -342,11 +342,15 @@
             export class VerticalScrollView extends android.widget.ScrollView {
                 constructor(context: android.content.Context);
                 public getScrollableLength(): number;
+                public getScrollEnabled(): boolean;
+                public setScrollEnabled(value: boolean): void;
             }
 
             export class HorizontalScrollView extends android.widget.HorizontalScrollView {
                 constructor(context: android.content.Context);
                 public getScrollableLength(): number;
+                public getScrollEnabled(): boolean;
+                public setScrollEnabled(value: boolean): void;
             }
 
             export class ImageView extends android.widget.ImageView {