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Refactor and migrate FlutterUndoManagerPlugin to ARC #52234

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Apr 22, 2024
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Refactor and migrate FlutterUndoManagerPlugin to ARC #52234

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231e00e
Refactor and migrate FlutterUndoManagerPlugin to ARC
jmagman Apr 18, 2024
1dad11d
Rewrite delegate and tests
jmagman Apr 19, 2024
f491d7f
More import cleanup
jmagman Apr 19, 2024
98725b4
Remove undoManager
jmagman Apr 19, 2024
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6 changes: 3 additions & 3 deletions shell/platform/darwin/ios/BUILD.gn
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Original file line number Diff line number Diff line change
Expand Up @@ -84,6 +84,9 @@ source_set("flutter_framework_source_arc") {
"framework/Source/FlutterTextureRegistryRelay.mm",
"framework/Source/FlutterUIPressProxy.h",
"framework/Source/FlutterUIPressProxy.mm",
"framework/Source/FlutterUndoManagerDelegate.h",
"framework/Source/FlutterUndoManagerPlugin.h",
"framework/Source/FlutterUndoManagerPlugin.mm",
"framework/Source/KeyCodeMap.g.mm",
"framework/Source/KeyCodeMap_Internal.h",
"framework/Source/UIViewController+FlutterScreenAndSceneIfLoaded.h",
Expand Down Expand Up @@ -157,9 +160,6 @@ source_set("flutter_framework_source") {
"framework/Source/FlutterPluginAppLifeCycleDelegate.mm",
"framework/Source/FlutterSemanticsScrollView.h",
"framework/Source/FlutterSemanticsScrollView.mm",
"framework/Source/FlutterUndoManagerDelegate.h",
"framework/Source/FlutterUndoManagerPlugin.h",
"framework/Source/FlutterUndoManagerPlugin.mm",
"framework/Source/FlutterView.h",
"framework/Source/FlutterView.mm",
"framework/Source/FlutterViewController.mm",
Expand Down
2 changes: 0 additions & 2 deletions shell/platform/darwin/ios/framework/Source/FlutterEngine.mm
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Original file line number Diff line number Diff line change
Expand Up @@ -430,7 +430,6 @@ - (void)setViewController:(FlutterViewController*)viewController {
[self maybeSetupPlatformViewChannels];
[self updateDisplays];
_textInputPlugin.get().viewController = viewController;
_undoManagerPlugin.get().viewController = viewController;

if (viewController) {
__block FlutterEngine* blockSelf = self;
Expand Down Expand Up @@ -465,7 +464,6 @@ - (void)setFlutterViewControllerWillDeallocObserver:(id<NSObject>)observer {
- (void)notifyViewControllerDeallocated {
[[self lifecycleChannel] sendMessage:@"AppLifecycleState.detached"];
_textInputPlugin.get().viewController = nil;
_undoManagerPlugin.get().viewController = nil;
if (!_allowHeadlessExecution) {
[self destroyContext];
} else if (_shell) {
Expand Down
8 changes: 8 additions & 0 deletions shell/platform/darwin/ios/framework/Source/FlutterUndoManagerDelegate.h
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Expand Up @@ -7,6 +7,8 @@

#import <Foundation/Foundation.h>

#import "flutter/shell/platform/darwin/ios/framework/Source/FlutterTextInputPlugin.h"

NS_ASSUME_NONNULL_BEGIN

typedef NS_ENUM(NSInteger, FlutterUndoRedoDirection) {
Expand All @@ -19,8 +21,14 @@ typedef NS_ENUM(NSInteger, FlutterUndoRedoDirection) {
@class FlutterUndoManagerPlugin;

@protocol FlutterUndoManagerDelegate <NSObject>

@property(nonatomic, weak) UIResponder* viewController;
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@stuartmorgan-g stuartmorgan-g Apr 19, 2024

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Could you add declaration comments to these explaining their role in the delegation? (Per style guide, all declarations should be commented. I know the engine is awful about this, but it would be good to break the cycle in new code.)

@jmagman jmagman Apr 19, 2024

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Documenting how this delegate works led me to rewrite it.

  1. The -flutterUndoManagerPlugin:handleUndoWithDirection: engine implementation doesn't use the undoManagerPlugin, so there's no need to pass it back through.

  2. I realized we were exposing the view controller just to get the undo manager, and exposing the text input plugin just to get the active text input view, which was a message chain code smell. I changed the delegate to just require the objects the undo manager plugin actually needs, and updated FlutterEngine's implementation of this protocol. This also allowed me to reduce the mocking in the tests.


- (FlutterTextInputPlugin*)textInputPlugin;
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- (void)flutterUndoManagerPlugin:(FlutterUndoManagerPlugin*)undoManagerPlugin
handleUndoWithDirection:(FlutterUndoRedoDirection)direction;

@end
NS_ASSUME_NONNULL_END

Expand Down
4 changes: 0 additions & 4 deletions shell/platform/darwin/ios/framework/Source/FlutterUndoManagerPlugin.h
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Expand Up @@ -7,15 +7,11 @@

#import <UIKit/UIKit.h>

#import "flutter/fml/memory/weak_ptr.h"
#import "flutter/shell/platform/darwin/common/framework/Headers/FlutterChannels.h"
#import "flutter/shell/platform/darwin/ios/framework/Headers/FlutterViewController.h"
#import "flutter/shell/platform/darwin/ios/framework/Source/FlutterUndoManagerDelegate.h"

@interface FlutterUndoManagerPlugin : NSObject

@property(nonatomic, assign) FlutterViewController* viewController;

- (instancetype)init NS_UNAVAILABLE;
+ (instancetype)new NS_UNAVAILABLE;

Expand Down
79 changes: 38 additions & 41 deletions shell/platform/darwin/ios/framework/Source/FlutterUndoManagerPlugin.mm
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Expand Up @@ -3,12 +3,8 @@
// found in the LICENSE file.

#import "flutter/shell/platform/darwin/ios/framework/Source/FlutterUndoManagerPlugin.h"
#import "flutter/shell/platform/darwin/ios/framework/Source/FlutterEngine_Internal.h"

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>

#include "flutter/fml/logging.h"
#import "flutter/shell/platform/darwin/ios/framework/Source/FlutterTextInputPlugin.h"

#pragma mark - UndoManager channel method names.
static NSString* const kSetUndoStateMethod = @"UndoManager.setUndoState";
Expand All @@ -17,15 +13,16 @@
static NSString* const kCanUndo = @"canUndo";
static NSString* const kCanRedo = @"canRedo";

@implementation FlutterUndoManagerPlugin {
id<FlutterUndoManagerDelegate> _undoManagerDelegate;
}
@interface FlutterUndoManagerPlugin ()
@property(nonatomic, weak, readonly) id<FlutterUndoManagerDelegate> undoManagerDelegate;

@jmagman jmagman Apr 18, 2024

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From below:

// `_undoManagerDelegate` is a weak reference because it should retain FlutterUndoManagerPlugin.

@stuartmorgan-g stuartmorgan-g Apr 19, 2024

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This should also have a declaration comment (maybe a short summary of what kinds of things are delegated).

@end

@implementation FlutterUndoManagerPlugin

- (instancetype)initWithDelegate:(id<FlutterUndoManagerDelegate>)undoManagerDelegate {
self = [super init];

if (self) {
// `_undoManagerDelegate` is a weak reference because it should retain FlutterUndoManagerPlugin.
_undoManagerDelegate = undoManagerDelegate;
}

Expand All @@ -34,7 +31,6 @@ - (instancetype)initWithDelegate:(id<FlutterUndoManagerDelegate>)undoManagerDele

- (void)dealloc {
[self resetUndoManager];

@stuartmorgan-g stuartmorgan-g Apr 19, 2024

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Optional since it's pre-existing: it would be good to inline the chain of calls (which is still only one line) to use _undoManagerDelegate directly instead of calling a self method in dealloc in violation of style guide/best practices.

@jmagman jmagman Apr 19, 2024 •
edited
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Done, and my refactor of the delegate reduced the chaining. It still calls self since that's what being passed into -removeAllActionsWithTarget but at least it isn't calling its own properties.

[_undoManagerDelegate.undoManager removeAllActionsWithTarget:self];

[super dealloc];
}

- (void)handleMethodCall:(FlutterMethodCall*)call result:(FlutterResult)result {
Expand All @@ -49,45 +45,47 @@ - (void)handleMethodCall:(FlutterMethodCall*)call result:(FlutterResult)result {
}

- (NSUndoManager*)undoManager {
return _viewController.undoManager;
return self.undoManagerDelegate.viewController.undoManager;
}

- (void)resetUndoManager API_AVAILABLE(ios(9.0)) {

@jmagman jmagman Apr 19, 2024

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Removed API_AVAILABLE(ios(9.0)) since the min is iOS 12. Must have missed that in a cleanup.

[[self undoManager] removeAllActionsWithTarget:self];
}

- (void)registerUndoWithDirection:(FlutterUndoRedoDirection)direction API_AVAILABLE(ios(9.0)) {
[[self undoManager] beginUndoGrouping];
[[self undoManager] registerUndoWithTarget:self
handler:^(id target) {
// Register undo with opposite direction.
FlutterUndoRedoDirection newDirection =
(direction == FlutterUndoRedoDirectionRedo)
? FlutterUndoRedoDirectionUndo
: FlutterUndoRedoDirectionRedo;
[target registerUndoWithDirection:newDirection];
// Invoke method on delegate.
[_undoManagerDelegate flutterUndoManagerPlugin:self
handleUndoWithDirection:direction];
}];
[[self undoManager] endUndoGrouping];
NSUndoManager* undoManager = [self undoManager];

@stuartmorgan-g stuartmorgan-g Apr 19, 2024

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Optional nit: self.undoManager

@jmagman jmagman Apr 19, 2024

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Right now it's a method, but I can add the readonly property. I was trying to limit the number of changes to this file, but I've touched everything at this point.

@jmagman jmagman Apr 19, 2024

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Scratch that. I since removed the -undoManager method and changed the callsites to self.undoManagerDelegate.undoManager.

[undoManager beginUndoGrouping];
[undoManager registerUndoWithTarget:self
handler:^(FlutterUndoManagerPlugin* target) {
// Register undo with opposite direction.
FlutterUndoRedoDirection newDirection =
(direction == FlutterUndoRedoDirectionRedo)
? FlutterUndoRedoDirectionUndo
: FlutterUndoRedoDirectionRedo;
[target registerUndoWithDirection:newDirection];
// Invoke method on delegate.
[target.undoManagerDelegate flutterUndoManagerPlugin:target

@jmagman jmagman Apr 18, 2024 •
edited
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Changed _undoManagerDelegate to target.undoManagerDelegate and passed target into flutterUndoManagerPlugin so self isn't retained in this block.

handleUndoWithDirection:direction];
}];
[undoManager endUndoGrouping];
}

- (void)registerRedo API_AVAILABLE(ios(9.0)) {
[[self undoManager] beginUndoGrouping];
[[self undoManager]
registerUndoWithTarget:self
handler:^(id target) {
// Register undo with opposite direction.
[target registerUndoWithDirection:FlutterUndoRedoDirectionRedo];
}];
[[self undoManager] endUndoGrouping];
[[self undoManager] undo];
NSUndoManager* undoManager = [self undoManager];
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[undoManager beginUndoGrouping];
[undoManager registerUndoWithTarget:self
handler:^(id target) {
// Register undo with opposite direction.
[target registerUndoWithDirection:FlutterUndoRedoDirectionRedo];
}];
[undoManager endUndoGrouping];
[undoManager undo];
}

- (void)setUndoState:(NSDictionary*)dictionary API_AVAILABLE(ios(9.0)) {
BOOL groupsByEvent = [self undoManager].groupsByEvent;
[self undoManager].groupsByEvent = NO;
NSUndoManager* undoManager = [self undoManager];
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BOOL groupsByEvent = undoManager.groupsByEvent;
undoManager.groupsByEvent = NO;
BOOL canUndo = [dictionary[kCanUndo] boolValue];
BOOL canRedo = [dictionary[kCanRedo] boolValue];

Expand All @@ -99,16 +97,15 @@ - (void)setUndoState:(NSDictionary*)dictionary API_AVAILABLE(ios(9.0)) {
if (canRedo) {
[self registerRedo];
}

if (_viewController.engine.textInputPlugin.textInputView != nil) {
UIView<UITextInput>* textInputView = [self.undoManagerDelegate.textInputPlugin textInputView];

@stuartmorgan-g stuartmorgan-g Apr 19, 2024

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Is textInputView not declared as a property?

@jmagman jmagman Apr 19, 2024

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No:
https://github.com/flutter/engine/blob/1363b52813e351414240aef7f15f849bf97f4ca7/shell/platform/darwin/ios/framework/Source/FlutterTextInputPlugin.h#L55

At the moment I don't want to tackle changing that in a public header.

if (textInputView != nil) {
// This is needed to notify the iPadOS keyboard that it needs to update the
// state of the UIBarButtons. Otherwise, the state changes to NSUndoManager
// will not show up until the next keystroke (or other trigger).
UITextInputAssistantItem* assistantItem =
_viewController.engine.textInputPlugin.textInputView.inputAssistantItem;
UITextInputAssistantItem* assistantItem = textInputView.inputAssistantItem;
assistantItem.leadingBarButtonGroups = assistantItem.leadingBarButtonGroups;
}
[self undoManager].groupsByEvent = groupsByEvent;
undoManager.groupsByEvent = groupsByEvent;
}

@end
55 changes: 24 additions & 31 deletions shell/platform/darwin/ios/framework/Source/FlutterUndoManagerPluginTest.mm
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Expand Up @@ -8,51 +8,48 @@
#import <XCTest/XCTest.h>

#import "flutter/shell/platform/darwin/common/framework/Headers/FlutterMacros.h"
#import "flutter/shell/platform/darwin/ios/framework/Headers/FlutterEngine.h"
#import "flutter/shell/platform/darwin/ios/framework/Headers/FlutterViewController.h"
#import "flutter/shell/platform/darwin/ios/framework/Source/FlutterTextInputPlugin.h"

FLUTTER_ASSERT_ARC

@interface FlutterEngine ()
- (nonnull FlutterUndoManagerPlugin*)undoManagerPlugin;
- (nonnull FlutterTextInputPlugin*)textInputPlugin;
@interface FlutterUndoManagerDelegateForTest : NSObject <FlutterUndoManagerDelegate>
@property(nonatomic, weak) UIResponder* viewController;
@property(nonatomic) FlutterTextInputPlugin* textInputPlugin;
@end

@interface FlutterUndoManagerPluginForTest : FlutterUndoManagerPlugin
@property(nonatomic, assign) NSUndoManager* undoManager;
@end
@implementation FlutterUndoManagerDelegateForTest

@implementation FlutterUndoManagerPluginForTest {
- (void)flutterUndoManagerPlugin:(FlutterUndoManagerPlugin*)undoManagerPlugin
handleUndoWithDirection:(FlutterUndoRedoDirection)direction {
}
@end

@interface FlutterUndoManagerPluginTest : XCTestCase
@property(nonatomic, strong) id engine;
@property(nonatomic, strong) FlutterUndoManagerPluginForTest* undoManagerPlugin;
@property(nonatomic, strong) FlutterViewController* viewController;
@property(nonatomic, strong) NSUndoManager* undoManager;
@property(nonatomic) id undoManagerDelegate;
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@property(nonatomic) FlutterUndoManagerPlugin* undoManagerPlugin;
@property(nonatomic) UIResponder* viewController;
@property(nonatomic) NSUndoManager* undoManager;
@end

@implementation FlutterUndoManagerPluginTest {
}
@implementation FlutterUndoManagerPluginTest

- (void)setUp {
[super setUp];
self.engine = OCMClassMock([FlutterEngine class]);

self.undoManagerPlugin = [[FlutterUndoManagerPluginForTest alloc] initWithDelegate:self.engine];
self.undoManagerDelegate = OCMClassMock([FlutterUndoManagerDelegateForTest class]);

self.viewController = [[FlutterViewController alloc] init];
self.undoManagerPlugin.viewController = self.viewController;
self.undoManagerPlugin =
[[FlutterUndoManagerPlugin alloc] initWithDelegate:self.undoManagerDelegate];
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self.undoManager = OCMClassMock([NSUndoManager class]);
self.undoManagerPlugin.undoManager = self.undoManager;

self.viewController = OCMClassMock([UIResponder class]);
OCMStub([self.viewController undoManager]).andReturn(self.undoManager);
OCMStub([self.undoManagerDelegate viewController]).andReturn(self.viewController);
}

- (void)tearDown {
[self.undoManager removeAllActionsWithTarget:self.undoManagerPlugin];

@jmagman jmagman Apr 19, 2024

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This was only class mocked, I don't think this would do anything.

self.engine = nil;
self.undoManagerDelegate = nil;
self.viewController = nil;
self.undoManager = nil;
[super tearDown];
Expand All @@ -75,14 +72,14 @@ - (void)testSetUndoState {
removeAllActionsCount++;
});
__block int delegateUndoCount = 0;

@jmagman jmagman Apr 19, 2024

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This is now tracked in the FakeFlutterUndoManagerDelegate test object, which is not mocked anywhere.

OCMStub([self.engine flutterUndoManagerPlugin:[OCMArg any]
handleUndoWithDirection:FlutterUndoRedoDirectionUndo])
OCMStub([self.undoManagerDelegate flutterUndoManagerPlugin:[OCMArg any]
handleUndoWithDirection:FlutterUndoRedoDirectionUndo])
.andDo(^(NSInvocation* invocation) {
delegateUndoCount++;
});
__block int delegateRedoCount = 0;
OCMStub([self.engine flutterUndoManagerPlugin:[OCMArg any]
handleUndoWithDirection:FlutterUndoRedoDirectionRedo])
OCMStub([self.undoManagerDelegate flutterUndoManagerPlugin:[OCMArg any]
handleUndoWithDirection:FlutterUndoRedoDirectionRedo])
.andDo(^(NSInvocation* invocation) {
delegateRedoCount++;
});
Expand Down Expand Up @@ -143,14 +140,10 @@ - (void)testSetUndoState {

- (void)testSetUndoStateDoesInteractWithInputDelegate {
// Regression test for https://github.com/flutter/flutter/issues/133424
FlutterViewController* viewController = OCMPartialMock(self.viewController);
self.undoManagerPlugin.viewController = self.viewController;

FlutterTextInputPlugin* textInputPlugin = OCMClassMock([FlutterTextInputPlugin class]);
FlutterTextInputView* textInputView = OCMClassMock([FlutterTextInputView class]);

OCMStub([viewController engine]).andReturn(self.engine);
OCMStub([self.engine textInputPlugin]).andReturn(textInputPlugin);
OCMStub([self.undoManagerDelegate textInputPlugin]).andReturn(textInputPlugin);
OCMStub([textInputPlugin textInputView]).andReturn(textInputView);

FlutterMethodCall* setUndoStateCall =
Expand Down