From ef4eb4d5172e0b9154f80906901c60f692a89bdc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=8E=8B=E5=8A=B2=E9=B9=8F?= <jingpeng.wang@outlook.com>
Date: Thu, 1 Sep 2022 10:19:18 +0800
Subject: [PATCH] iOS: update horizontal list beforeDragging & add itemCanDrag

---
 doric-demo/src/HorizontalListDemo.ts          | 14 ++++-
 .../Classes/Shader/DoricHorizontalListNode.m  | 60 +++++++++++++++----
 2 files changed, 60 insertions(+), 14 deletions(-)

diff --git a/doric-demo/src/HorizontalListDemo.ts b/doric-demo/src/HorizontalListDemo.ts
index 48d6006b..8b01d942 100644
--- a/doric-demo/src/HorizontalListDemo.ts
+++ b/doric-demo/src/HorizontalListDemo.ts
@@ -66,11 +66,21 @@ class ListVM extends ViewModel<ListModel, ListVH> {
     onAttached(state: ListModel, vh: ListVH) {
         vh.list.apply({
             canDrag: true,
+            itemCanDrag: (from) => {
+                if (from === 0) {
+                    return false;
+                } else {
+                    return true;
+                }
+            },
+            beforeDragging: (from) => {
+                return [0, 1, 2]
+            },
             onDragging: (from, to) => {
-                log(`onDragging, from: ${from}, to: ${to}`)
+                loge(`onDragging from: ${from}, to: ${to}`)
             },
             onDragged: (from, to) => {
-                log(`onDragged, from: ${from}, to: ${to}`)
+                loge(`onDragged from: ${from}, to: ${to}`)
             },
             renderItem: (index) => {
                 const data = state.data[index]
diff --git a/doric-iOS/Pod/Classes/Shader/DoricHorizontalListNode.m b/doric-iOS/Pod/Classes/Shader/DoricHorizontalListNode.m
index 5f5165f7..2ea74c34 100644
--- a/doric-iOS/Pod/Classes/Shader/DoricHorizontalListNode.m
+++ b/doric-iOS/Pod/Classes/Shader/DoricHorizontalListNode.m
@@ -72,11 +72,12 @@ @interface DoricHorizontalListNode () <UICollectionViewDataSource, UICollectionV
 @property(nonatomic, strong) DoricJSDispatcher *jsDispatcher;
 
 @property(nonatomic, strong) UILongPressGestureRecognizer *longPress;
-@property(nonatomic, strong) NSIndexPath *initialDragIndexPath;
 @property(nonatomic, strong) NSIndexPath *currentDragIndexPath;
+@property(nonatomic, copy) NSString *itemCanDragFuncId;
 @property(nonatomic, copy) NSString *beforeDraggingFuncId;
 @property(nonatomic, copy) NSString *onDraggingFuncId;
 @property(nonatomic, copy) NSString *onDraggedFuncId;
+@property(nonatomic, strong) NSArray *swapDisabled;
 
 @property(nonatomic, assign) NSUInteger rowCount;
 @property(nonatomic, assign) BOOL needReload;
@@ -124,29 +125,29 @@ - (void)longPressAction:(UILongPressGestureRecognizer *)sender {
     NSIndexPath *indexPath = [self.view indexPathForItemAtPoint:locationInView];
     if (sender.state == UIGestureRecognizerStateBegan) {
         if (indexPath != nil) {
-            self.initialDragIndexPath = indexPath;
+            [self.view beginInteractiveMovementForItemAtIndexPath:indexPath];
+            
             self.currentDragIndexPath = indexPath;
             if (self.beforeDraggingFuncId != nil) {
-                [self callJSResponse:self.beforeDraggingFuncId, @(indexPath.row), nil];
+                DoricAsyncResult *asyncResult = [self callJSResponse:self.beforeDraggingFuncId, @(indexPath.row), nil];
+                JSValue *model = [asyncResult waitUntilResult];
+                if (model.isArray) {
+                    self.swapDisabled = [model toArray];
+                }
             }
         }
     } else if (sender.state == UIGestureRecognizerStateChanged) {
+        [self.view updateInteractiveMovementTargetPosition:[sender locationInView:self.view]];
         if ((indexPath != nil) && (indexPath != self.currentDragIndexPath)) {
-            NSString *fromValue = self.itemViewIds[@(self.currentDragIndexPath.row)];
-            NSString *toValue = self.itemViewIds[@(indexPath.row)];
-            self.itemViewIds[@(self.currentDragIndexPath.row)] = toValue;
-            self.itemViewIds[@(indexPath.row)] = fromValue;
-
-            [self.view moveItemAtIndexPath:self.currentDragIndexPath toIndexPath:indexPath];
             if (self.onDraggingFuncId != nil) {
                 [self callJSResponse:self.onDraggingFuncId, @(self.currentDragIndexPath.row), @(indexPath.row), nil];
             }
             self.currentDragIndexPath = indexPath;
         }
     } else if (sender.state == UIGestureRecognizerStateEnded) {
-        if (self.onDraggedFuncId != nil) {
-            [self callJSResponse:self.onDraggedFuncId, @(self.initialDragIndexPath.row), @(self.currentDragIndexPath.row), nil];
-        }
+        [self.view endInteractiveMovement];
+    } else {
+        [self.view cancelInteractiveMovement];
     }
 }
 
@@ -194,6 +195,8 @@ - (void)blendView:(UICollectionView *)view forPropName:(NSString *)name propValu
     } else if ([@"canDrag" isEqualToString:name]) {
         bool canDrag = [prop boolValue];
         [self.longPress setEnabled:canDrag];
+    } else if ([@"itemCanDrag" isEqualToString:name]) {
+        self.itemCanDragFuncId = prop;
     } else if ([@"beforeDragging" isEqualToString:name]) {
         self.beforeDraggingFuncId = prop;
     } else if ([@"onDragging" isEqualToString:name]) {
@@ -493,6 +496,38 @@ - (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL
     }
 }
 
+- (NSIndexPath *)collectionView:(UICollectionView *)collectionView targetIndexPathForMoveFromItemAtIndexPath:(NSIndexPath *)currentIndexPath toProposedIndexPath:(NSIndexPath *)proposedIndexPath {
+    if (self.swapDisabled != nil) {
+        for (int i = 0; i != self.swapDisabled.count; i++) {
+            if (proposedIndexPath.row == [self.swapDisabled[i] intValue]) {
+                return currentIndexPath;
+            }
+        }
+    }
+    return proposedIndexPath;
+}
+
+- (BOOL)collectionView:(UICollectionView *)collectionView canMoveItemAtIndexPath:(NSIndexPath *)indexPath {
+    if (self.itemCanDragFuncId != nil) {
+        DoricAsyncResult *asyncResult = [self callJSResponse:self.itemCanDragFuncId, @(indexPath.row), nil];
+        JSValue *model = [asyncResult waitUntilResult];
+        if (model.isBoolean) {
+            return [model toBool];
+        }
+    }
+    return true;
+}
+
+- (void)collectionView:(UICollectionView *)collectionView moveItemAtIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath *)destinationIndexPath {
+    NSString *fromValue = self.itemViewIds[@(sourceIndexPath.row)];
+    NSString *toValue = self.itemViewIds[@(destinationIndexPath.row)];
+    self.itemViewIds[@(sourceIndexPath.row)] = toValue;
+    self.itemViewIds[@(destinationIndexPath.row)] = fromValue;
+    if (self.onDraggedFuncId != nil) {
+        [self callJSResponse:self.onDraggedFuncId, @(sourceIndexPath.row), @(destinationIndexPath.row), nil];
+    }
+}
+
 - (NSMutableSet<DoricDidScrollBlock> *)didScrollBlocks {
     if (!_didScrollBlocks) {
         _didScrollBlocks = [NSMutableSet new];
@@ -549,6 +584,7 @@ - (void)reset {
     self.loadMoreViewId = nil;
     self.onScrollFuncId = nil;
     self.onScrollEndFuncId = nil;
+    self.itemCanDragFuncId = nil;
     self.beforeDraggingFuncId = nil;
     self.onDraggingFuncId = nil;
     self.onDraggedFuncId = nil;