plugin_framework, flutter event handlers

Signed-off-by: fufesou <shuanglongchen@yeah.net>

flutter/lib/plugin/model.dart

@@ -0,0 +1,76 @@
+import 'package:flutter/material.dart';
+import './common.dart';
+import './desc.dart';
+
+final Map<String, LocationModel> locationModels = {};
+final Map<String, KvModel> kvModels = {};
+
+class KvModel with ChangeNotifier {
+  final Map<String, String> kv = {};
+
+  String? get(String key) => kv.remove(key);
+
+  void set(String key, String value) {
+    kv[key] = value;
+    notifyListeners();
+  }
+}
+
+class PluginModel with ChangeNotifier {
+  final List<UiType> uiList = [];
+  final Map<String, String> opts = {};
+
+  void add(UiType ui) {
+    uiList.add(ui);
+    notifyListeners();
+  }
+
+  String? getOpt(String key) => opts.remove(key);
+
+  bool get isEmpty => uiList.isEmpty;
+}
+
+class LocationModel with ChangeNotifier {
+  final Map<PluginId, PluginModel> pluginModels = {};
+
+  void add(PluginId id, UiType ui) {
+    if (pluginModels[id] != null) {
+      pluginModels[id]!.add(ui);
+    } else {
+      var model = PluginModel();
+      model.add(ui);
+      pluginModels[id] = model;
+      notifyListeners();
+    }
+  }
+
+  bool get isEmpty => pluginModels.isEmpty;
+}
+
+void addLocationUi(String location, PluginId id, UiType ui) {
+  locationModels[location]?.add(id, ui);
+}
+
+LocationModel addLocation(String location) {
+  if (locationModels[location] == null) {
+    locationModels[location] = LocationModel();
+  }
+  return locationModels[location]!;
+}
+
+String makeKvModelInstance(String location, PluginId id, String peer) =>
+    '$location|$id|$peer';
+
+KvModel addKvModel(String location, PluginId pluginId, String peer) {
+  final instance = makeKvModelInstance(location, pluginId, peer);
+  if (kvModels[instance] == null) {
+    kvModels[instance] = KvModel();
+  }
+  return kvModels[instance]!;
+}
+
+void updateOption(
+    String location, PluginId id, String peer, String key, String value) {
+  final instance = makeKvModelInstance(location, id, peer);
+  kvModels[instance]?.set(key, value);
+}