books

packages/idraw/lib/p14/touch_info.dart

@@ -0,0 +1,45 @@
+import 'package:flutter/material.dart';
+
+/// create by 张风捷特烈 on 2020/11/4
+/// contact me by email 1981462002@qq.com
+/// 说明:
+
+class TouchInfo extends ChangeNotifier {
+  List<Offset> _points = [];
+  int _selectIndex = -1;
+
+  void setPoints(List<Offset> points) {
+    _points = points;
+  }
+
+
+  int get selectIndex => _selectIndex;
+
+  List<Offset> get points => _points;
+
+  set selectIndex(int value) {
+    assert(value != null);
+    if (_selectIndex == value) return;
+
+    _selectIndex = value;
+    notifyListeners();
+  }
+
+  void addPoint(Offset point) {
+    points.add(point);
+    notifyListeners();
+  }
+
+  void updatePoint(int index, Offset point) {
+    points[index] = point;
+    notifyListeners();
+  }
+
+  void reset() {
+    _points.clear();
+    _selectIndex = -1;
+    notifyListeners();
+  }
+
+  Offset? get selectPoint => _selectIndex == -1 ? null : _points[_selectIndex];
+}