[macos] fix mouse dragging

common/simple_handler.cc

@@ -105,17 +105,17 @@ void SimpleHandler::OnBeforeClose(CefRefPtr<CefBrowser> browser) {
 }
 
 bool SimpleHandler::OnBeforePopup(CefRefPtr<CefBrowser> browser,
-    CefRefPtr<CefFrame> frame,
-    const CefString& target_url,
-    const CefString& target_frame_name,
-    WindowOpenDisposition target_disposition,
-    bool user_gesture,
-    const CefPopupFeatures& popupFeatures,
-    CefWindowInfo& windowInfo,
-    CefRefPtr<CefClient>& client,
-    CefBrowserSettings& settings,
-    CefRefPtr<CefDictionaryValue>& extra_info,
-    bool* no_javascript_access) {
+                                  CefRefPtr<CefFrame> frame,
+                                  const CefString& target_url,
+                                  const CefString& target_frame_name,
+                                  WindowOpenDisposition target_disposition,
+                                  bool user_gesture,
+                                  const CefPopupFeatures& popupFeatures,
+                                  CefWindowInfo& windowInfo,
+                                  CefRefPtr<CefClient>& client,
+                                  CefBrowserSettings& settings,
+                                  CefRefPtr<CefDictionaryValue>& extra_info,
+                                  bool* no_javascript_access) {
     loadUrl(target_url);
     return true;
 }
@@ -204,13 +204,16 @@ void SimpleHandler::cursorClick(int x, int y, bool up)
     }
 }
 
-void SimpleHandler::cursorMove(int x , int y)
+void SimpleHandler::cursorMove(int x , int y, bool dragging)
 {
     BrowserList::const_iterator it = browser_list_.begin();
     if (it != browser_list_.end()) {
         CefMouseEvent ev;
         ev.x = x;
         ev.y = y;
+        if(dragging) {
+            ev.modifiers = EVENTFLAG_LEFT_MOUSE_BUTTON;
+        }
         (*it)->GetHost()->SendMouseMoveEvent(ev, false);
     }
 }

common/simple_handler.h

@@ -78,7 +78,7 @@ public:
     void sendScrollEvent(int x, int y, int deltaX, int deltaY);
     void changeSize(float a_dpi, int width, int height);
     void cursorClick(int x, int y, bool up);
-    void cursorMove(int x, int y);
+    void cursorMove(int x, int y, bool dragging);
     void sendKeyEvent(CefKeyEvent ev);
     void loadUrl(std::string url);
     void goForward();

lib/src/webview.dart

@@ -88,6 +88,15 @@ class WebViewController extends ValueNotifier<bool> {
         .invokeMethod('cursorMove', [position.dx, position.dy]);
   }
 
+    Future<void> _cursorDragging(Offset position) async {
+    if (_isDisposed) {
+      return;
+    }
+    assert(value);
+    return _pluginChannel
+        .invokeMethod('cursorDragging', [position.dx, position.dy]);
+  }
+
   Future<void> _cursorClickDown(Offset position) async {
     if (_isDisposed) {
       return;
@@ -163,20 +172,16 @@ class WebViewState extends State<WebView> {
         child: SizeChangedLayoutNotifier(
             child: Listener(
           onPointerHover: (ev) {
-            print("move1");
             _controller._cursorMove(ev.localPosition);
           },
           onPointerDown: (ev) {
-            print("down");
             _controller._cursorClickDown(ev.localPosition);
           },
           onPointerUp: (ev) {
-            print("up");
             _controller._cursorClickUp(ev.localPosition);
           },
           onPointerMove: (ev) {
-            print("move2");
-            _controller._cursorMove(ev.localPosition);
+            _controller._cursorDragging(ev.localPosition);
           },
           onPointerSignal: (signal) {
             if (signal is PointerScrollEvent) {

macos/Classes/CefWrapper.h

@@ -23,7 +23,7 @@ extern int64_t textureId;
 
 + (void) cursorClickDown: (int)x y:(int)y;
 
-+ (void) cursorMove: (int)x y:(int)y;
++ (void) cursorMove: (int)x y:(int)y dragging:(bool)dragging;
 
 + (void) sendScrollEvent:(int)x y:(int)y deltaX:(int)deltaX deltaY:(int)deltaY;
 

macos/Classes/CefWrapper.mm

@@ -196,8 +196,8 @@ int64_t textureId;
     handler.get()->cursorClick(x, y, false);
 }
 
-+ (void)cursorMove:(int)x y:(int)y {
-    handler.get()->cursorMove(x, y);
++ (void)cursorMove:(int)x y:(int)y dragging:(bool)dragging {
+    handler.get()->cursorMove(x, y, dragging);
 }
 
 + (void)sizeChanged:(float)dpi width:(int)width height:(int)height {

macos/Classes/WebviewCefPlugin.m

@@ -60,7 +60,14 @@
         NSArray<NSNumber *> *_arg = call.arguments;
         NSNumber *x = [_arg objectAtIndex:0];
         NSNumber *y = [_arg objectAtIndex:1];
-        [CefWrapper cursorMove:[x intValue] y:[y intValue]];
+        [CefWrapper cursorMove:[x intValue] y:[y intValue] dragging: false];
+        result(nil);
+    }
+    else if([@"cursorDragging" isEqualToString:call.method]){
+        NSArray<NSNumber *> *_arg = call.arguments;
+        NSNumber *x = [_arg objectAtIndex:0];
+        NSNumber *y = [_arg objectAtIndex:1];
+        [CefWrapper cursorMove:[x intValue] y:[y intValue] dragging: true];
         result(nil);
     }
     else if([@"setSize" isEqualToString:call.method]){