Add text selection mixin

This mixin leverages HTML callbacks that can be set by WebView editor to send text selection event to the composer so the composer will receive text selection event necessary to display buttons related to text selection.
2025-12-04 17:00:08 +01:00
parent 2ccb203610
commit 4013973110
2 changed files with 151 additions and 0 deletions
@@ -0,0 +1,77 @@
+import 'package:flutter/material.dart';
+
+class TextSelectionData {
+  final bool hasSelection;
+  final String? selectedText;
+  final TextSelectionCoordinates? coordinates;
+
+  const TextSelectionData({
+    required this.hasSelection,
+    this.selectedText,
+    this.coordinates,
+  });
+
+  factory TextSelectionData.empty() {
+    return const TextSelectionData(hasSelection: false);
+  }
+
+  factory TextSelectionData.fromMap(Map<dynamic, dynamic> data) {
+    try {
+      final hasSelection = data['hasSelection'] as bool? ?? false;
+
+      if (!hasSelection) {
+        return TextSelectionData.empty();
+      }
+
+      final selectedText = data['selectedText'] as String?;
+      final coordinatesData = data['coordinates'];
+
+      if (coordinatesData != null && selectedText != null) {
+        final coordinates = TextSelectionCoordinates.fromMap(coordinatesData);
+        return TextSelectionData(
+          hasSelection: true,
+          selectedText: selectedText,
+          coordinates: coordinates,
+        );
+      }
+
+      return TextSelectionData.empty();
+    } catch (e) {
+      return TextSelectionData.empty();
+    }
+  }
+}
+
+class TextSelectionCoordinates {
+  final double x;
+  final double y;
+  final double width;
+  final double height;
+
+  const TextSelectionCoordinates({
+    required this.x,
+    required this.y,
+    required this.width,
+    required this.height,
+  });
+
+  factory TextSelectionCoordinates.fromMap(Map<dynamic, dynamic> data) {
+    return TextSelectionCoordinates(
+      x: (data['x'] as num?)?.toDouble() ?? 0.0,
+      y: (data['y'] as num?)?.toDouble() ?? 0.0,
+      width: (data['width'] as num?)?.toDouble() ?? 0.0,
+      height: (data['height'] as num?)?.toDouble() ?? 0.0,
+    );
+  }
+
+  Offset get position => Offset(x, y);
+}
+
+mixin TextSelectionMixin<T extends StatefulWidget> on State<T> {
+  void Function(TextSelectionData?)? get onSelectionChanged => null;
+
+  void handleSelectionChange(Map<dynamic, dynamic> data) {
+    final selectionData = TextSelectionData.fromMap(data);
+    onSelectionChanged?.call(selectionData);
+  }
+}