opt context menu

Signed-off-by: dom <githubaccount56556@proton.me>

lib/utils/extension/selectable_region_ext.dart

@@ -1,32 +1,52 @@
 import 'package:PiliPlus/utils/extension/iterable_ext.dart';
 import 'package:PiliPlus/utils/page_utils.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter/rendering.dart' show Selectable;
 
 extension SelectableRegionStateExt on SelectableRegionState {
   void addLaunchMenuIfNeeded(
     List<ContextMenuButtonItem> buttonItems, {
     required int index,
   }) {
-    try {
-      if (selectionEndpoints.first != selectionEndpoints[1]) {
-        buttonItems.insertOrAdd(
-          index,
-          ContextMenuButtonItem(
-            label: '打开',
-            onPressed: () {
-              final text = (this as dynamic).selectable
-                  ?.getSelectedContent()
-                  ?.plainText
-                  .trim();
-              hideToolbar();
-              clearSelection();
-              if (text != null && text.isNotEmpty) {
-                PageUtils.launchURL(text);
-              }
-            },
-          ),
-        );
-      }
-    } catch (_) {}
+    if (isUncollapsed) {
+      buttonItems.insertOrAdd(
+        index,
+        ContextMenuButtonItem(
+          label: '打开',
+          onPressed: () {
+            onMenuPressed(
+              PageUtils.launchURL,
+              content: () => selectedText?.trim(),
+            );
+          },
+        ),
+      );
+    }
+  }
+
+  String? get selectedText => ((this as dynamic).selectable as Selectable?)
+      ?.getSelectedContent()
+      ?.plainText;
+
+  bool get isUncollapsed =>
+      ((this as dynamic).selectionDelegate as StaticSelectionContainerDelegate)
+          .value
+          .status ==
+      .uncollapsed;
+
+  void onMenuPressed(
+    ValueChanged<String> callback, {
+    ValueGetter<String?>? content,
+  }) {
+    final text = content?.call() ?? selectedText;
+    hideAndClear();
+    if (text != null && text.isNotEmpty) {
+      callback(text);
+    }
+  }
+
+  void hideAndClear() {
+    hideToolbar();
+    clearSelection();
   }
 }