chore: refactor to allow interaction with root gesture ahnderl

Author: farfromrefug

plugin/platforms/android/java/com/nativescript/gesturehandler/PageLayout.java

@@ -15,14 +15,17 @@
 import com.swmansion.gesturehandler.GestureHandler;
 import com.swmansion.gesturehandler.ViewConfigurationHelper;
 
+import java.util.ArrayList;
+
 public class PageLayout extends org.nativescript.widgets.GridLayout {
-    public PageLayout(Context context) {
+    public PageLayout(Context context, int rootGestureTag) {
         super(context);
+        mRootGestureTag = rootGestureTag;
         addRow(new ItemSpec(1, GridUnitType.auto));
         addRow(new ItemSpec(1, GridUnitType.star));
     }
-    private final static int GESTURE_HANDLER_TAG = -12345;
 
+    private int mRootGestureTag;
     private GestureHandlerOrchestrator mOrchestrator;
     private GestureHandlerRegistryImpl mRegistry;
     private ViewConfigurationHelper configurationHelper;
@@ -31,6 +34,7 @@ public PageLayout(Context context) {
     private boolean mShouldIntercept = false;
     private boolean mPassingTouch = false;
     private boolean mDispatchToOrchestra = true;
+    private boolean mShouldAddRootGesture = true;
 
     public void setShouldIntercept(boolean value) {
         if (GestureHandler.debug) {
@@ -42,6 +46,13 @@ public void setShouldIntercept(boolean value) {
     public void setPassingTouch(boolean value) {
         this.mPassingTouch = value;
     }
+    public void setShouldAddRootGesture(boolean value) {
+        this.mShouldAddRootGesture = value;
+    }
+
+    public int getRootGestureTag() {
+        return mRootGestureTag;
+    }
 
     public void setDispatchToOrchestra(boolean value) {
         if (GestureHandler.debug) {
@@ -71,12 +82,21 @@ public void tryCancelAllHandlers() {
         if (GestureHandler.debug) {
             Log.d("JS", "PageLayout tryCancelAllHandlers ");
         }
-        // In order to cancel handlers we activate handler that is hooked to the root view
-        if (this.rootGestureHandler != null && this.rootGestureHandler.getState() == com.swmansion.gesturehandler.GestureHandler.STATE_BEGAN) {
-            // Try activate main JS handler
-            this.rootGestureHandler.activate();
-            this.rootGestureHandler.end();
+        ArrayList<GestureHandler> handlers = this.mRegistry.getAllHandlers();
+        if (handlers != null) {
+            for(int i = 0; i < handlers.size(); i++) {
+                GestureHandler handler = handlers.get(i);
+                if (handler != this.rootGestureHandler) {
+                    handler.cancel();
+                }
+            }
         }
+        // In order to cancel handlers we activate handler that is hooked to the root view
+        // if (this.rootGestureHandler != null && this.rootGestureHandler.getState() == com.swmansion.gesturehandler.GestureHandler.STATE_BEGAN) {
+        //     // Try activate main JS handler
+        //     this.rootGestureHandler.activate();
+        //     this.rootGestureHandler.end();
+        // }
     }
 
     public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) {
@@ -156,9 +176,9 @@ public View getChildInDrawingOrderAtIndex(ViewGroup parent, int index) {
         this.mOrchestrator.setMinimumAlphaForTraversal(0.01f);
 
         this.rootGestureHandler = new RootViewGestureHandler();
-        this.rootGestureHandler.setTag(GESTURE_HANDLER_TAG);
+        this.rootGestureHandler.setTag(mRootGestureTag);
         this.mRegistry.registerHandler(this.rootGestureHandler);
-        this.mRegistry.attachHandlerToView(GESTURE_HANDLER_TAG, this);
+        this.mRegistry.attachHandlerToView(mRootGestureTag, this);
     }
 
     public void tearDown() {

plugin/platforms/android/java/com/swmansion/gesturehandler/GestureHandlerRegistry.java

@@ -7,4 +7,6 @@
 
 public interface GestureHandlerRegistry {
   ArrayList<GestureHandler> getHandlersForView(View view);
+  ArrayList<GestureHandler> getAllHandlers();
+  
 }

plugin/platforms/android/java/com/swmansion/gesturehandler/GestureHandlerRegistryImpl.java

@@ -7,6 +7,7 @@
 import com.swmansion.gesturehandler.GestureHandlerRegistry;
 
 import java.util.ArrayList;
+import java.util.List;
 import java.util.WeakHashMap;
 
 import androidx.annotation.Nullable;
@@ -27,6 +28,16 @@ public synchronized void registerHandler(GestureHandler handler) {
     return mHandlers.get(handlerTag);
   }
 
+  public synchronized ArrayList<GestureHandler> getAllHandlers() {
+    if (mHandlers == null)
+      return null;
+    ArrayList<GestureHandler> arrayList = new ArrayList<GestureHandler>(mHandlers.size());
+    for (int i = 0; i < mHandlers.size(); i++) {
+      arrayList.add(mHandlers.valueAt(i));
+    }
+    return arrayList;
+  }
+
   public synchronized boolean attachHandlerToView(int handlerTag, android.view.View view) {
     GestureHandler handler = mHandlers.get(handlerTag);
     if (handler != null) {

src/gesturehandler.android.ts

@@ -27,6 +27,7 @@ import {
     applyMixins,
     install as installBase,
     nativeProperty,
+    ROOT_GESTURE_HANDLER_TAG,
 } from './gesturehandler.common';
 import { observe as gestureObserve } from './gestures_override';
 
@@ -47,6 +48,7 @@ class PageGestureExtended extends Page {
 }
 let installed = false;
 let installedOverrides = false;
+
 export function install(overrideNGestures = false) {
     if (!installed) {
         installed = true;
@@ -56,7 +58,7 @@ export function install(overrideNGestures = false) {
             if (!PageLayout) {
                 PageLayout = com.nativescript.gesturehandler.PageLayout;
             }
-            const layout = new PageLayout(this._context);
+            const layout = new PageLayout(this._context, ROOT_GESTURE_HANDLER_TAG);
             this.gestureRegistry = layout.registry;
             return layout;
         };

src/gesturehandler.common.ts

@@ -30,6 +30,7 @@ import {
 
 export const GestureHandlerStateEvent = 'GestureHandlerStateEvent';
 export const GestureHandlerTouchEvent = 'GestureHandlerTouchEvent';
+export const ROOT_GESTURE_HANDLER_TAG = -12345;
 
 export enum HandlerType {
     PAN = 'pan',