fix selection link

packages/zefyr/lib/src/widgets/rich_text.dart

@@ -115,6 +115,13 @@ class RenderZefyrParagraph extends RenderParagraph
     return super.getPositionForOffset(offset);
   }
 
+  TextRange getRenderBoxWordBoundary(int length) {
+    return TextRange(
+      start: node.documentOffset + node.length - length - 1,
+      end: node.documentOffset + node.length - 1,
+    );
+  }
+
   @override
   TextRange getWordBoundary(TextPosition position) {
     final localPosition = TextPosition(

packages/zefyr/lib/src/widgets/selection.dart

@@ -266,11 +266,11 @@ class _ZefyrSelectionOverlayState extends State<ZefyrSelectionOverlay>
       RenderZefyrParagraph paragraph = box.child;
       if (_scope.controller.getStyleForSelection(selection).contains(NotusAttribute.link)) {
         // 当前点击的是link
-        var position = paragraph.getRenderBoxPositionForOffset(localPoint);
-        // 第一个字符和最后一个字符将不触发onTap
+        var spanPosition = paragraph.getRenderBoxPositionForOffset(localPoint);
+        // // 第一个字符和最后一个字符将不触发onTap
         final TextSpan span = paragraph.text.getSpanForPosition(TextPosition(
-          offset: position.offset == 0 ? position.offset - 1 : position.offset + 1,
-          affinity: position.affinity,
+          offset: spanPosition.offset == 0 ? spanPosition.offset - 1 : spanPosition.offset + 1,
+          affinity: spanPosition.affinity,
         ));
         final recognizer = (span?.recognizer as TapGestureRecognizer);
         if (recognizer != null) {
@@ -310,13 +310,32 @@ class _ZefyrSelectionOverlayState extends State<ZefyrSelectionOverlay>
     _longPressPosition = null;
     HitTestResult result = HitTestResult();
     WidgetsBinding.instance.hitTest(result, globalPoint);
-    final box = _getEditableBox(result);
+    RenderEditableProxyBox box = _getEditableBox(result);
     if (box == null) {
       return;
     }
     final localPoint = box.globalToLocal(globalPoint);
     final position = box.getPositionForOffset(localPoint);
-    final word = box.getWordBoundary(position);
+    var word = box.getWordBoundary(position);
+    
+    if (box?.child is RenderZefyrParagraph) {
+      RenderZefyrParagraph paragraph = box.child;
+      if (_scope.controller.getStyleForSelection(TextSelection.collapsed(
+          offset: position.offset,
+          affinity: position.affinity,
+        )).contains(NotusAttribute.link)) {
+        // 当前点击的是link
+        var spanPosition = paragraph.getRenderBoxPositionForOffset(localPoint);
+        // // 第一个字符和最后一个字符将不触发onTap
+        final TextSpan span = paragraph.text.getSpanForPosition(TextPosition(
+          offset: spanPosition.offset == 0 ? spanPosition.offset - 1 : spanPosition.offset + 1,
+          affinity: spanPosition.affinity,
+        ));
+        if (span != null) {
+          word = paragraph.getRenderBoxWordBoundary(span.text.length);
+        }
+      }
+    }
     final selection = TextSelection(
       baseOffset: word.start,
       extentOffset: word.end,
@@ -489,16 +508,22 @@ class _SelectionHandleDriverState extends State<SelectionHandleDriver>
         alignment: Alignment.topLeft,
         width: interactiveRect.width,
         height: interactiveRect.height,
-        child: RawGestureDetector(
+        child: 
+        //  RawGestureDetector(
+        //   behavior: HitTestBehavior.translucent,
+        //   gestures: <Type, GestureRecognizerFactory>{
+        //     CustomPanGestureRecognizer: GestureRecognizerFactoryWithHandlers<
+        //         CustomPanGestureRecognizer>(
+        //       () => CustomPanGestureRecognizer(
+        //           onPanDown: _handleDragStart, onPanUpdate: _handleDragUpdate),
+        //       (CustomPanGestureRecognizer instance) {},
+        //     ),
+        //   },
+        GestureDetector(
           behavior: HitTestBehavior.translucent,
-          gestures: <Type, GestureRecognizerFactory>{
-            CustomPanGestureRecognizer: GestureRecognizerFactoryWithHandlers<
-                CustomPanGestureRecognizer>(
-              () => CustomPanGestureRecognizer(
-                  onPanDown: _handleDragStart, onPanUpdate: _handleDragUpdate),
-              (CustomPanGestureRecognizer instance) {},
-            ),
-          },
+          dragStartBehavior: DragStartBehavior.start,
+          onPanStart: _handleDragStart,
+          onPanUpdate: _handleDragUpdate,
           child: Padding(
             padding: EdgeInsets.only(
               left: padding.left,
@@ -548,13 +573,13 @@ class _SelectionHandleDriverState extends State<SelectionHandleDriver>
     }
   }
 
-  bool _handleDragStart(Offset details) {
-    _dragPosition = Offset(details.dx, details.dy);
+  bool _handleDragStart(DragStartDetails details) {
+    _dragPosition = details.globalPosition;
     return true;
   }
 
-  void _handleDragUpdate(Offset details) {
-    _dragPosition = Offset(details.dx, details.dy);
+  void _handleDragUpdate(DragUpdateDetails details) {
+    _dragPosition += details.delta;
     final globalPoint = _dragPosition;
     final paragraph = _scope.renderContext.boxForGlobalPoint(globalPoint);
     if (paragraph == null) {