feat(RenderWindowInteractor): preventDefault api

Adds support for toggling calls to preventDefault on pointerdown and
pointerup.

stopPropagation is removed, since it is unnecessary.

Author: floryst

Sources/Rendering/Core/RenderWindowInteractor/index.d.ts

@@ -57,6 +57,8 @@ export interface IRenderWindowInteractorInitialValues {
 	lastFrameTime?: number;
 	wheelTimeoutID?: number;
 	moveTimeoutID?: number;
+	preventDefaultOnPointerDown?: boolean;
+	preventDefaultOnPointerUp?: boolean;
 }
 
 interface IPosition {
@@ -151,6 +153,16 @@ export interface vtkRenderWindowInteractor extends vtkObject {
 	 */
 	getStillUpdateRate(): number;
 
+	/**
+	 * @default false
+	 */
+	getPreventDefaultOnPointerDown(): boolean;
+
+	/**
+	 * @default false
+	 */
+	getPreventDefaultOnPointerUp(): boolean;
+
 	/**
 	 * 
 	 * @param {IRenderWindowInteractorEvent} callData 
@@ -821,6 +833,22 @@ export interface vtkRenderWindowInteractor extends vtkObject {
 	setPicker(picker: any): boolean;
 
 	/**
+	 * Set whether preventDefault is called on pointer down.
+	 * @param {Boolean} preventDefault
+	 */
+	setPreventDefaultOnPointerDown(preventDefault: boolean): boolean;
+
+	/**
+	 * Set whether preventDefault is called on pointer up.
+	 *
+	 * If pointerup occurs without a preceeding pointerdown, then
+	 * this does nothing.
+	 *
+	 * @param {Boolean} preventDefault
+	 */
+	setPreventDefaultOnPointerUp(preventDefault: boolean): boolean;
+
+   /**
 	 *
 	 * @param recognizeGestures
 	 */

Sources/Rendering/Core/RenderWindowInteractor/index.js

@@ -68,11 +68,8 @@ const handledEvents = [
 
 function preventDefault(event) {
   if (event.cancelable) {
-    event.stopPropagation();
     event.preventDefault();
   }
-
-  return false;
 }
 
 function pointerCacheToPositions(cache) {
@@ -211,7 +208,6 @@ function vtkRenderWindowInteractor(publicAPI, model) {
   publicAPI.bindEvents = (container) => {
     model.container = container;
     container.addEventListener('contextmenu', preventDefault);
-    // container.addEventListener('click', preventDefault); // Avoid stopping event propagation
     container.addEventListener('wheel', publicAPI.handleWheel);
     container.addEventListener('DOMMouseScroll', publicAPI.handleWheel);
     container.addEventListener('pointerenter', publicAPI.handlePointerEnter);
@@ -244,7 +240,6 @@ function vtkRenderWindowInteractor(publicAPI, model) {
   publicAPI.unbindEvents = () => {
     const { container } = model;
     container.removeEventListener('contextmenu', preventDefault);
-    // model.container.removeEventListener('click', preventDefault); // Avoid stopping event propagation
     container.removeEventListener('wheel', publicAPI.handleWheel);
     container.removeEventListener('DOMMouseScroll', publicAPI.handleWheel);
     container.removeEventListener('pointerenter', publicAPI.handlePointerEnter);
@@ -315,7 +310,9 @@ function vtkRenderWindowInteractor(publicAPI, model) {
       // ignore events from extra mouse buttons such as `back` and `forward`
       return;
     }
-    preventDefault(event);
+    if (model.preventDefaultOnPointerDown) {
+      preventDefault(event);
+    }
 
     if (event.target.hasPointerCapture(event.pointerId)) {
       event.target.releasePointerCapture(event.pointerId);
@@ -345,7 +342,9 @@ function vtkRenderWindowInteractor(publicAPI, model) {
 
   publicAPI.handlePointerUp = (event) => {
     if (pointerCache.has(event.pointerId)) {
-      preventDefault(event);
+      if (model.preventDefaultOnPointerUp) {
+        preventDefault(event);
+      }
 
       pointerCache.delete(event.pointerId);
       model.container.releasePointerCapture(event.pointerId);
@@ -1140,6 +1139,8 @@ const DEFAULT_VALUES = {
   wheelTimeoutID: 0,
   moveTimeoutID: 0,
   lastGamepadValues: {},
+  preventDefaultOnPointerDown: false,
+  preventDefaultOnPointerUp: false,
 };
 
 // ----------------------------------------------------------------------------
@@ -1177,6 +1178,8 @@ export function extend(publicAPI, model, initialValues = {}) {
     'desiredUpdateRate',
     'stillUpdateRate',
     'picker',
+    'preventDefaultOnPointerDown',
+    'preventDefaultOnPointerUp',
   ]);
   macro.moveToProtected(publicAPI, model, ['view']);