feat: add ability to pass touch event thru parent view (#135)

* [WIP] feat: enhance hit-testing support
* refactor(ios): update passthroughParent logic as per reqs
* refactor: move isPassthroughParentEnabled to LayoutBase
* refactor: renames

android/widgets/src/main/java/org/nativescript/widgets/DisableUserInteractionListener.java

@@ -1,15 +0,0 @@
-package org.nativescript.widgets;
-
-import android.view.MotionEvent;
-import android.view.View;
-
-/**
- * Created by hhristov on 2/22/17.
- */
-
-public final class DisableUserInteractionListener extends Object implements View.OnTouchListener {
-    @Override
-    public boolean onTouch(View view, MotionEvent motionEvent) {
-        return true;
-    }
-}

android/widgets/src/main/java/org/nativescript/widgets/LayoutBase.java

@@ -6,6 +6,7 @@ package org.nativescript.widgets;
 import android.content.Context;
 import android.util.AttributeSet;
 import android.view.Gravity;
+import android.view.MotionEvent;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.FrameLayout;
@@ -20,6 +21,11 @@ public abstract class LayoutBase extends ViewGroup {
 		super(context);
 	}
 
+    private boolean passThroughParent;
+
+    public boolean getPassThroughParent() { return this.passThroughParent; }
+    public void setPassThroughParent(boolean value) { this.passThroughParent = value; }
+
     @Override
     protected LayoutParams generateDefaultLayoutParams() {
         return new CommonLayoutParams();
@@ -59,6 +65,18 @@ public abstract class LayoutBase extends ViewGroup {
 	public boolean shouldDelayChildPressedState() {
 		return false;
 	}
+
+    @Override
+    public boolean onTouchEvent(MotionEvent event) {
+        if (!this.passThroughParent) {
+            return super.onTouchEvent(event);
+        }
+
+        // LayoutBase.onTouchEvent(ev) execution means no interactive child view handled
+        // the event so we let the event pass through to parent view of the layout container
+        // because passThroughParent is set to true
+        return false;
+    }
 	
 	protected static int getGravity(View view) {
 		int gravity = -1;

ios/TNSWidgets/TNSWidgets.xcodeproj/project.pbxproj

@@ -9,6 +9,12 @@
 /* Begin PBXBuildFile section */
 		8B7321CF1D097ECD00884AC6 /* TNSLabel.h in Headers */ = {isa = PBXBuildFile; fileRef = 8B7321CD1D097ECD00884AC6 /* TNSLabel.h */; settings = {ATTRIBUTES = (Public, ); }; };
 		8B7321D01D097ECD00884AC6 /* TNSLabel.m in Sources */ = {isa = PBXBuildFile; fileRef = 8B7321CE1D097ECD00884AC6 /* TNSLabel.m */; };
+		B8E76F52212C2DA2009CFCE2 /* NSObject+Swizzling.h in Headers */ = {isa = PBXBuildFile; fileRef = B8E76F50212C2DA2009CFCE2 /* NSObject+Swizzling.h */; settings = {ATTRIBUTES = (Private, ); }; };
+		B8E76F53212C2DA2009CFCE2 /* NSObject+Swizzling.m in Sources */ = {isa = PBXBuildFile; fileRef = B8E76F51212C2DA2009CFCE2 /* NSObject+Swizzling.m */; };
+		B8E76F5A212C2F4E009CFCE2 /* NSObject+PropertyBag.h in Headers */ = {isa = PBXBuildFile; fileRef = B8E76F58212C2F4E009CFCE2 /* NSObject+PropertyBag.h */; settings = {ATTRIBUTES = (Private, ); }; };
+		B8E76F5B212C2F4E009CFCE2 /* NSObject+PropertyBag.m in Sources */ = {isa = PBXBuildFile; fileRef = B8E76F59212C2F4E009CFCE2 /* NSObject+PropertyBag.m */; };
+		B8E76F5E212C3134009CFCE2 /* UIView+PassThroughParent.h in Headers */ = {isa = PBXBuildFile; fileRef = B8E76F5C212C3134009CFCE2 /* UIView+PassThroughParent.h */; settings = {ATTRIBUTES = (Public, ); }; };
+		B8E76F5F212C3134009CFCE2 /* UIView+PassThroughParent.m in Sources */ = {isa = PBXBuildFile; fileRef = B8E76F5D212C3134009CFCE2 /* UIView+PassThroughParent.m */; };
 		F915D3551EC9EF5E00071914 /* TNSProcess.m in Sources */ = {isa = PBXBuildFile; fileRef = F915D3531EC9EF5E00071914 /* TNSProcess.m */; };
 		F915D3561EC9EF5E00071914 /* TNSProcess.h in Headers */ = {isa = PBXBuildFile; fileRef = F915D3541EC9EF5E00071914 /* TNSProcess.h */; settings = {ATTRIBUTES = (Public, ); }; };
 		F98F5CB31CD0EFEA00978308 /* TNSWidgets.h in Headers */ = {isa = PBXBuildFile; fileRef = F98F5CB21CD0EFEA00978308 /* TNSWidgets.h */; settings = {ATTRIBUTES = (Public, ); }; };
@@ -31,6 +37,12 @@
 /* Begin PBXFileReference section */
 		8B7321CD1D097ECD00884AC6 /* TNSLabel.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = TNSLabel.h; sourceTree = "<group>"; };
 		8B7321CE1D097ECD00884AC6 /* TNSLabel.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = TNSLabel.m; sourceTree = "<group>"; };
+		B8E76F50212C2DA2009CFCE2 /* NSObject+Swizzling.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = "NSObject+Swizzling.h"; sourceTree = "<group>"; };
+		B8E76F51212C2DA2009CFCE2 /* NSObject+Swizzling.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = "NSObject+Swizzling.m"; sourceTree = "<group>"; };
+		B8E76F58212C2F4E009CFCE2 /* NSObject+PropertyBag.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = "NSObject+PropertyBag.h"; sourceTree = "<group>"; };
+		B8E76F59212C2F4E009CFCE2 /* NSObject+PropertyBag.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = "NSObject+PropertyBag.m"; sourceTree = "<group>"; };
+		B8E76F5C212C3134009CFCE2 /* UIView+PassThroughParent.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = "UIView+PassThroughParent.h"; sourceTree = "<group>"; };
+		B8E76F5D212C3134009CFCE2 /* UIView+PassThroughParent.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = "UIView+PassThroughParent.m"; sourceTree = "<group>"; };
 		F915D3531EC9EF5E00071914 /* TNSProcess.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = TNSProcess.m; path = ../TNSProcess.m; sourceTree = "<group>"; };
 		F915D3541EC9EF5E00071914 /* TNSProcess.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = TNSProcess.h; path = ../TNSProcess.h; sourceTree = "<group>"; };
 		F98F5CAF1CD0EFEA00978308 /* TNSWidgets.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = TNSWidgets.framework; sourceTree = BUILT_PRODUCTS_DIR; };
@@ -91,6 +103,12 @@
 				F98F5CC91CD0F09E00978308 /* UIImage+TNSBlocks.h */,
 				F98F5CCA1CD0F09E00978308 /* UIImage+TNSBlocks.m */,
 				F98F5CB41CD0EFEA00978308 /* Info.plist */,
+				B8E76F50212C2DA2009CFCE2 /* NSObject+Swizzling.h */,
+				B8E76F51212C2DA2009CFCE2 /* NSObject+Swizzling.m */,
+				B8E76F58212C2F4E009CFCE2 /* NSObject+PropertyBag.h */,
+				B8E76F59212C2F4E009CFCE2 /* NSObject+PropertyBag.m */,
+				B8E76F5C212C3134009CFCE2 /* UIView+PassThroughParent.h */,
+				B8E76F5D212C3134009CFCE2 /* UIView+PassThroughParent.m */,
 			);
 			path = TNSWidgets;
 			sourceTree = "<group>";
@@ -113,7 +131,10 @@
 			files = (
 				F915D3561EC9EF5E00071914 /* TNSProcess.h in Headers */,
 				F98F5CB31CD0EFEA00978308 /* TNSWidgets.h in Headers */,
+				B8E76F5E212C3134009CFCE2 /* UIView+PassThroughParent.h in Headers */,
 				F98F5CCB1CD0F09E00978308 /* UIImage+TNSBlocks.h in Headers */,
+				B8E76F52212C2DA2009CFCE2 /* NSObject+Swizzling.h in Headers */,
+				B8E76F5A212C2F4E009CFCE2 /* NSObject+PropertyBag.h in Headers */,
 				8B7321CF1D097ECD00884AC6 /* TNSLabel.h in Headers */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
@@ -217,6 +238,9 @@
 				8B7321D01D097ECD00884AC6 /* TNSLabel.m in Sources */,
 				F915D3551EC9EF5E00071914 /* TNSProcess.m in Sources */,
 				F98F5CCC1CD0F09E00978308 /* UIImage+TNSBlocks.m in Sources */,
+				B8E76F53212C2DA2009CFCE2 /* NSObject+Swizzling.m in Sources */,
+				B8E76F5B212C2F4E009CFCE2 /* NSObject+PropertyBag.m in Sources */,
+				B8E76F5F212C3134009CFCE2 /* UIView+PassThroughParent.m in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};

ios/TNSWidgets/TNSWidgets/NSObject+PropertyBag.h

@@ -0,0 +1,17 @@
+//
+//  NSObject+PropertyBag.h
+//  TNSWidgets
+//
+//  Created by Manol Donev on 21.08.18.
+//  Copyright © 2018 Telerik A D. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+
+@interface NSObject (PropertyBag)
+
+- (id) propertyValueForKey:(NSString*) key;
+- (void) setPropertyValue:(id) value forKey:(NSString*) key;
+
+@end

ios/TNSWidgets/TNSWidgets/NSObject+PropertyBag.m

@@ -0,0 +1,62 @@
+//
+//  NSObject+PropertyBag.m
+//  TNSWidgets
+//
+//  Created by Manol Donev on 21.08.18.
+//  Copyright © 2018 Telerik A D. All rights reserved.
+//
+
+#import "NSObject+PropertyBag.h"
+#import "NSObject+Swizzling.h"
+
+
+@implementation NSObject (PropertyBag)
+
++ (void) load{
+    [self loadPropertyBag];
+}
+
++ (void) loadPropertyBag{
+    @autoreleasepool {
+        static dispatch_once_t onceToken;
+        dispatch_once(&onceToken, ^{
+            const SEL deallocSelector  = NSSelectorFromString(@"dealloc"); //ARC forbids use of 'dealloc' in a @selector
+            [self swizzleInstanceMethodWithOriginalSelector:deallocSelector fromClass:self.class withSwizzlingSelector:@selector(propertyBag_dealloc)];
+        });
+    }
+}
+
+__strong NSMutableDictionary *_propertyBagHolder; // Properties for every class will go in this property bag
+- (id) propertyValueForKey:(NSString*) key {
+    return [[self propertyBag] valueForKey:key];
+}
+
+- (void) setPropertyValue:(id) value forKey:(NSString*) key {
+    [[self propertyBag] setValue:value forKey:key];
+}
+
+- (NSMutableDictionary*) propertyBag {
+    if (_propertyBagHolder == nil) _propertyBagHolder = [[NSMutableDictionary alloc] initWithCapacity:100];
+    NSMutableDictionary *propBag = [_propertyBagHolder valueForKey:[[NSString alloc] initWithFormat:@"%p", self]];
+    if (propBag == nil) {
+        propBag = [NSMutableDictionary dictionary];
+        [self setPropertyBag:propBag];
+    }
+    
+    return propBag;
+}
+
+- (void) setPropertyBag:(NSDictionary*) propertyBag {
+    if (_propertyBagHolder == nil) {
+        _propertyBagHolder = [[NSMutableDictionary alloc] initWithCapacity:100];
+    }
+    
+    [_propertyBagHolder setValue:propertyBag forKey:[[NSString alloc] initWithFormat:@"%p", self]];
+}
+
+- (void)propertyBag_dealloc {
+    [self setPropertyBag:nil];
+    [self propertyBag_dealloc]; // swizzled
+}
+
+@end

ios/TNSWidgets/TNSWidgets/NSObject+Swizzling.h

@@ -0,0 +1,17 @@
+//
+//  NSObject+Swizzling.h
+//  TNSWidgets
+//
+//  Created by Manol Donev on 21.08.18.
+//  Copyright © 2018 Telerik A D. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+#import <objc/runtime.h>
+
+
+@interface NSObject (Swizzling)
+
++ (void)swizzleInstanceMethodWithOriginalSelector:(SEL)originalSelector fromClass:(Class)classContainigOriginalSel withSwizzlingSelector:(SEL)swizzlingSelector;
+
+@end

ios/TNSWidgets/TNSWidgets/NSObject+Swizzling.m

@@ -0,0 +1,68 @@
+//
+//  NSObject+Swizzling.m
+//  TNSWidgets
+//
+//  Created by Manol Donev on 21.08.18.
+//  Copyright © 2018 Telerik A D. All rights reserved.
+//
+
+#import "NSObject+Swizzling.h"
+
+@implementation NSObject (Swizzling)
+
+#pragma mark - Method Swizzling
+
++ (void)swizzleInstanceMethodWithOriginalSelector:(SEL)originalSelector
+                                        fromClass:(Class)classContainigOriginalSel
+                            withSwizzlingSelector:(SEL)swizzlingSelector {
+    Method originalMethod = class_getInstanceMethod(classContainigOriginalSel, originalSelector);
+    Method swizzlingMethod = class_getInstanceMethod(self.class, swizzlingSelector);
+    [self swizzleMethodWithOriginalSelector:originalSelector
+                             originalMethod:originalMethod
+                                  fromClass:classContainigOriginalSel
+                      withSwizzlingSelector:swizzlingSelector
+                            swizzlingMethod:swizzlingMethod];
+}
+
+//MARK: Utilities
+
++ (void)swizzleMethodWithOriginalSelector:(SEL)originalSelector
+                           originalMethod:(Method)originalMethod
+                                fromClass:(Class)classContainigOriginalSel
+                    withSwizzlingSelector:(SEL)swizzlingSelector
+                          swizzlingMethod:(Method)swizzlingMethod {
+    if (self == classContainigOriginalSel) {
+        BOOL didAddMethod = class_addMethod(classContainigOriginalSel,
+                                            originalSelector,
+                                            method_getImplementation(swizzlingMethod),
+                                            method_getTypeEncoding(swizzlingMethod));
+        
+        if (didAddMethod) {
+            class_replaceMethod(self.class,
+                                swizzlingSelector,
+                                method_getImplementation(originalMethod),
+                                method_getTypeEncoding(originalMethod));
+        } else {
+            method_exchangeImplementations(originalMethod, swizzlingMethod);
+        }
+        
+        return;
+    }
+    
+    class_addMethod(classContainigOriginalSel,
+                    swizzlingSelector,
+                    method_getImplementation(originalMethod),
+                    method_getTypeEncoding(originalMethod));
+    
+    class_replaceMethod(classContainigOriginalSel,
+                        originalSelector,
+                        method_getImplementation(swizzlingMethod),
+                        method_getTypeEncoding(swizzlingMethod));
+    
+    class_replaceMethod(self,
+                        swizzlingSelector,
+                        method_getImplementation(originalMethod),
+                        method_getTypeEncoding(originalMethod));
+}
+
+@end

ios/TNSWidgets/TNSWidgets/TNSWidgets.h

@@ -17,5 +17,6 @@ FOUNDATION_EXPORT const unsigned char TNSWidgetsVersionString[];
 // In this header, you should import all the public headers of your framework using statements like #import <TNSWidgets/PublicHeader.h>
 
 #import "UIImage+TNSBlocks.h"
+#import "UIView+PassThroughParent.h"
 #import "TNSLabel.h"
 #import "TNSProcess.h"

ios/TNSWidgets/TNSWidgets/UIView+PassthroughParent.h

@@ -0,0 +1,17 @@
+//
+//  UIView+PassThroughParent.h
+//  TNSWidgets
+//
+//  Created by Manol Donev on 21.08.18.
+//  Copyright © 2018 Telerik A D. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+
+@interface UIView (PassThroughParent)
+
+- (BOOL) passThroughParent;
+- (void) setPassThroughParent:(BOOL) passThroughParent;
+
+@end

ios/TNSWidgets/TNSWidgets/UIView+PassthroughParent.m

@@ -0,0 +1,53 @@
+//
+//  UIView+PassThroughParent.m
+//  TNSWidgets
+//
+//  Created by Manol Donev on 21.08.18.
+//  Copyright © 2018 Telerik A D. All rights reserved.
+//
+
+#import "UIView+PassThroughParent.h"
+#import "NSObject+Swizzling.h"
+#import "NSObject+PropertyBag.h"
+
+
+NSString * const TLKPassThroughParentKey = @"passThroughParent";
+
+@implementation UIView (PassThroughParent)
+
++ (void) load {
+    [self loadHitTest];
+}
+
++ (void) loadHitTest {
+    @autoreleasepool {
+        static dispatch_once_t onceToken;
+        dispatch_once(&onceToken, ^{
+            [self swizzleInstanceMethodWithOriginalSelector:@selector(hitTest:withEvent:) fromClass:self.class withSwizzlingSelector:@selector(passThrough_hitTest:withEvent:)];
+        });
+    }
+}
+
+- (BOOL)passThroughParent {
+    NSNumber *passthrough = [self propertyValueForKey:TLKPassThroughParentKey];
+    if (passthrough) {
+        return passthrough.boolValue;
+    };
+
+    return NO;
+}
+
+- (void)setPassThroughParent:(BOOL)passThroughParent {
+    [self setPropertyValue:[NSNumber numberWithBool:passThroughParent] forKey:TLKPassThroughParentKey];
+}
+
+- (UIView *)passThrough_hitTest:(CGPoint)point withEvent:(UIEvent *)event {
+    UIView *hitTestView = [self passThrough_hitTest:point withEvent:event]; // swizzled
+    if (hitTestView == self && self.passThroughParent) {
+        hitTestView = nil;
+    }
+
+    return hitTestView;
+}
+
+@end