Add find visible items for list and flowlayout

doric-iOS/Pod/Classes/Shader/DoricFlowLayoutItemNode.m

@@ -31,4 +31,11 @@ - (void)initWithSuperNode:(DoricSuperNode *)superNode {
     [super initWithSuperNode:superNode];
     self.reusable = YES;
 }
+
+- (void)blendView:(UIView *)view forPropName:(NSString *)name propValue:(id)prop {
+    if ([@"identifier" isEqualToString:name] || [@"fullSpan" isEqualToString:name]) {
+    } else {
+        [super blendView:view forPropName:name propValue:prop];
+    }
+}
 @end

doric-iOS/Pod/Classes/Shader/DoricFlowLayoutNode.m

@@ -483,4 +483,37 @@ - (void)addDidScrollBlock:(__nonnull DoricDidScrollBlock)didScrollListener {
 - (void)removeDidScrollBlock:(__nonnull DoricDidScrollBlock)didScrollListener {
     [self.didScrollBlocks removeObject:didScrollListener];
 }
+
+- (NSArray *)findVisibleItems {
+    return [[self.view.indexPathsForVisibleItems map:^id(NSIndexPath *obj) {
+        return @(obj.row);
+    }] sortedArrayUsingComparator:^NSComparisonResult(NSNumber *obj1, NSNumber *obj2) {
+        if (obj1.unsignedIntegerValue > obj2.unsignedIntegerValue) {
+            return NSOrderedDescending;
+        } else if (obj1.unsignedIntegerValue < obj2.unsignedIntegerValue) {
+            return NSOrderedAscending;
+        } else {
+            return NSOrderedSame;
+        }
+
+    }];
+}
+
+- (NSArray *)findCompletelyVisibleItems {
+    NSArray<__kindof UICollectionViewCell *> *items = [self.view.visibleCells filter:^BOOL(__kindof UICollectionViewCell *obj) {
+        return CGRectContainsRect(self.view.bounds, obj.frame);
+    }];
+    return [[items map:^id(__kindof UICollectionViewCell *obj) {
+        return @([self.view indexPathForCell:obj].row);
+    }] sortedArrayUsingComparator:^NSComparisonResult(NSNumber *obj1, NSNumber *obj2) {
+        if (obj1.unsignedIntegerValue > obj2.unsignedIntegerValue) {
+            return NSOrderedDescending;
+        } else if (obj1.unsignedIntegerValue < obj2.unsignedIntegerValue) {
+            return NSOrderedAscending;
+        } else {
+            return NSOrderedSame;
+        }
+
+    }];
+}
 @end

doric-iOS/Pod/Classes/Shader/DoricListNode.m

@@ -448,4 +448,18 @@ - (void)scrollToItem:(NSDictionary *)params {
     }
 }
 
+- (NSArray *)findVisibleItems {
+    return [self.view.indexPathsForVisibleRows map:^id(NSIndexPath *obj) {
+        return @(obj.row);
+    }];
+}
+
+- (NSArray *)findCompletelyVisibleItems {
+    NSArray<__kindof UITableViewCell *> *items = [self.view.visibleCells filter:^BOOL(__kindof UITableViewCell *obj) {
+        return CGRectContainsRect(self.view.bounds, obj.frame);
+    }];
+    return [items map:^id(__kindof UITableViewCell *obj) {
+        return @([self.view indexPathForCell:obj].row);
+    }];
+}
 @end