[ios][secure_paste]show menu item based on info sent from framework (flutter#161103)

This is moved from flutter/engine#56362

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Author: hellohuanlin

engine/src/flutter/shell/platform/darwin/ios/framework/Source/FlutterEngine.mm

@@ -1050,6 +1050,21 @@ - (void)flutterTextInputView:(FlutterTextInputView*)textInputView
                            arguments:@[ @(client) ]];
 }
 
+- (void)flutterTextInputView:(FlutterTextInputView*)textInputView
+           shareSelectedText:(NSString*)selectedText {
+  [self.platformPlugin showShareViewController:selectedText];
+}
+
+- (void)flutterTextInputView:(FlutterTextInputView*)textInputView
+    searchWebWithSelectedText:(NSString*)selectedText {
+  [self.platformPlugin searchWeb:selectedText];
+}
+
+- (void)flutterTextInputView:(FlutterTextInputView*)textInputView
+          lookUpSelectedText:(NSString*)selectedText {
+  [self.platformPlugin showLookUpViewController:selectedText];
+}
+
 #pragma mark - FlutterViewEngineDelegate
 
 - (void)flutterTextInputView:(FlutterTextInputView*)textInputView showToolbar:(int)client {

engine/src/flutter/shell/platform/darwin/ios/framework/Source/FlutterPlatformPlugin.h

@@ -14,6 +14,9 @@
 - (instancetype)initWithEngine:(FlutterEngine*)engine NS_DESIGNATED_INITIALIZER;
 - (void)handleMethodCall:(FlutterMethodCall*)call result:(FlutterResult)result;
 
+- (void)showShareViewController:(NSString*)content;
+- (void)searchWeb:(NSString*)searchTerm;
+- (void)showLookUpViewController:(NSString*)term;
 @end
 
 namespace flutter {

engine/src/flutter/shell/platform/darwin/ios/framework/Source/FlutterTextInputDelegate.h

@@ -67,6 +67,12 @@ typedef NS_ENUM(NSInteger, FlutterFloatingCursorDragState) {
     didResignFirstResponderWithTextInputClient:(int)client;
 - (void)flutterTextInputView:(FlutterTextInputView*)textInputView
     willDismissEditMenuWithTextInputClient:(int)client;
+- (void)flutterTextInputView:(FlutterTextInputView*)textInputView
+           shareSelectedText:(NSString*)selectedText;
+- (void)flutterTextInputView:(FlutterTextInputView*)textInputView
+    searchWebWithSelectedText:(NSString*)selectedText;
+- (void)flutterTextInputView:(FlutterTextInputView*)textInputView
+          lookUpSelectedText:(NSString*)selectedText;
 @end
 
 #endif  // FLUTTER_SHELL_PLATFORM_DARWIN_IOS_FRAMEWORK_SOURCE_FLUTTERTEXTINPUTDELEGATE_H_

engine/src/flutter/shell/platform/darwin/ios/framework/Source/FlutterTextInputPlugin.mm

@@ -802,6 +802,7 @@ @interface FlutterTextInputView ()
 // etc)
 @property(nonatomic, copy) NSString* temporarilyDeletedComposedCharacter;
 @property(nonatomic, assign) CGRect editMenuTargetRect;
+@property(nonatomic, strong) NSArray<NSDictionary*>* editMenuItems;
 
 - (void)setEditableTransform:(NSArray*)matrix;
 @end
@@ -875,10 +876,123 @@ - (instancetype)initWithOwner:(FlutterTextInputPlugin*)textInputPlugin {
   return self;
 }
 
+- (void)handleSearchWebAction {
+  [self.textInputDelegate flutterTextInputView:self
+                     searchWebWithSelectedText:[self textInRange:_selectedTextRange]];
+}
+
+- (void)handleLookUpAction {
+  [self.textInputDelegate flutterTextInputView:self
+                            lookUpSelectedText:[self textInRange:_selectedTextRange]];
+}
+
+- (void)handleShareAction {
+  [self.textInputDelegate flutterTextInputView:self
+                             shareSelectedText:[self textInRange:_selectedTextRange]];
+}
+
+// DFS algorithm to search a UICommand from the menu tree.
+- (UICommand*)searchCommandWithSelector:(SEL)selector
+                                element:(UIMenuElement*)element API_AVAILABLE(ios(16.0)) {
+  if ([element isKindOfClass:UICommand.class]) {
+    UICommand* command = (UICommand*)element;
+    return command.action == selector ? command : nil;
+  } else if ([element isKindOfClass:UIMenu.class]) {
+    NSArray<UIMenuElement*>* children = ((UIMenu*)element).children;
+    for (UIMenuElement* child in children) {
+      UICommand* result = [self searchCommandWithSelector:selector element:child];
+      if (result) {
+        return result;
+      }
+    }
+    return nil;
+  } else {
+    return nil;
+  }
+}
+
+- (void)addBasicEditingCommandToItems:(NSMutableArray*)items
+                                 type:(NSString*)type
+                             selector:(SEL)selector
+                        suggestedMenu:(UIMenu*)suggestedMenu {
+  UICommand* command = [self searchCommandWithSelector:selector element:suggestedMenu];
+  if (command) {
+    [items addObject:command];
+  } else {
+    FML_LOG(ERROR) << "Cannot find context menu item of type \"" << type.UTF8String << "\".";
+  }
+}
+
+- (void)addAdditionalBasicCommandToItems:(NSMutableArray*)items
+                                    type:(NSString*)type
+                                selector:(SEL)selector
+                             encodedItem:(NSDictionary<NSString*, id>*)encodedItem {
+  NSString* title = encodedItem[@"title"];
+  if (title) {
+    UICommand* command = [UICommand commandWithTitle:title
+                                               image:nil
+                                              action:selector
+                                        propertyList:nil];
+    [items addObject:command];
+  } else {
+    FML_LOG(ERROR) << "Missing title for context menu item of type \"" << type.UTF8String << "\".";
+  }
+}
+
 - (UIMenu*)editMenuInteraction:(UIEditMenuInteraction*)interaction
           menuForConfiguration:(UIEditMenuConfiguration*)configuration
               suggestedActions:(NSArray<UIMenuElement*>*)suggestedActions API_AVAILABLE(ios(16.0)) {
-  return [UIMenu menuWithChildren:suggestedActions];
+  UIMenu* suggestedMenu = [UIMenu menuWithChildren:suggestedActions];
+  if (!_editMenuItems) {
+    return suggestedMenu;
+  }
+
+  NSMutableArray* items = [NSMutableArray array];
+  for (NSDictionary<NSString*, id>* encodedItem in _editMenuItems) {
+    NSString* type = encodedItem[@"type"];
+    if ([type isEqualToString:@"copy"]) {
+      [self addBasicEditingCommandToItems:items
+                                     type:type
+                                 selector:@selector(copy:)
+                            suggestedMenu:suggestedMenu];
+    } else if ([type isEqualToString:@"paste"]) {
+      [self addBasicEditingCommandToItems:items
+                                     type:type
+                                 selector:@selector(paste:)
+                            suggestedMenu:suggestedMenu];
+    } else if ([type isEqualToString:@"cut"]) {
+      [self addBasicEditingCommandToItems:items
+                                     type:type
+                                 selector:@selector(cut:)
+                            suggestedMenu:suggestedMenu];
+    } else if ([type isEqualToString:@"delete"]) {
+      [self addBasicEditingCommandToItems:items
+                                     type:type
+                                 selector:@selector(delete:)
+                            suggestedMenu:suggestedMenu];
+    } else if ([type isEqualToString:@"selectAll"]) {
+      [self addBasicEditingCommandToItems:items
+                                     type:type
+                                 selector:@selector(selectAll:)
+                            suggestedMenu:suggestedMenu];
+    } else if ([type isEqualToString:@"searchWeb"]) {
+      [self addAdditionalBasicCommandToItems:items
+                                        type:type
+                                    selector:@selector(handleSearchWebAction)
+                                 encodedItem:encodedItem];
+    } else if ([type isEqualToString:@"share"]) {
+      [self addAdditionalBasicCommandToItems:items
+                                        type:type
+                                    selector:@selector(handleShareAction)
+                                 encodedItem:encodedItem];
+    } else if ([type isEqualToString:@"lookUp"]) {
+      [self addAdditionalBasicCommandToItems:items
+                                        type:type
+                                    selector:@selector(handleLookUpAction)
+                                 encodedItem:encodedItem];
+    }
+  }
+  return [UIMenu menuWithChildren:items];
 }
 
 - (void)editMenuInteraction:(UIEditMenuInteraction*)interaction
@@ -894,8 +1008,10 @@ - (CGRect)editMenuInteraction:(UIEditMenuInteraction*)interaction
   return _editMenuTargetRect;
 }
 
-- (void)showEditMenuWithTargetRect:(CGRect)targetRect API_AVAILABLE(ios(16.0)) {
+- (void)showEditMenuWithTargetRect:(CGRect)targetRect
+                             items:(NSArray<NSDictionary*>*)items API_AVAILABLE(ios(16.0)) {
   _editMenuTargetRect = targetRect;
+  _editMenuItems = items;
   UIEditMenuConfiguration* config =
       [UIEditMenuConfiguration configurationWithIdentifier:nil sourcePoint:CGPointZero];
   [self.editMenuInteraction presentEditMenuWithConfiguration:config];
@@ -2574,7 +2690,7 @@ - (BOOL)showEditMenu:(NSDictionary*)args API_AVAILABLE(ios(16.0)) {
       [encodedTargetRect[@"x"] doubleValue], [encodedTargetRect[@"y"] doubleValue],
       [encodedTargetRect[@"width"] doubleValue], [encodedTargetRect[@"height"] doubleValue]);
   CGRect localTargetRect = [self.hostView convertRect:globalTargetRect toView:self.activeView];
-  [self.activeView showEditMenuWithTargetRect:localTargetRect];
+  [self.activeView showEditMenuWithTargetRect:localTargetRect items:args[@"items"]];
   return YES;
 }