| Flutter iOS Embedder |

platform_view_ios.h
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1 // Copyright 2013 The Flutter Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #ifndef FLUTTER_SHELL_PLATFORM_DARWIN_IOS_PLATFORM_VIEW_IOS_H_
6 #define FLUTTER_SHELL_PLATFORM_DARWIN_IOS_PLATFORM_VIEW_IOS_H_
7
8 #include <memory>
9
10 #include "flutter/fml/closure.h"
11 #include "flutter/fml/macros.h"
12 #include "flutter/shell/common/platform_view.h"
13 #import "flutter/shell/platform/darwin/common/framework/Headers/FlutterTexture.h"
14 #import "flutter/shell/platform/darwin/ios/framework/Headers/FlutterViewController.h"
15 #import "flutter/shell/platform/darwin/ios/framework/Source/FlutterView.h"
16 #import "flutter/shell/platform/darwin/ios/framework/Source/accessibility_bridge.h"
17 #import "flutter/shell/platform/darwin/ios/ios_context.h"
18 #import "flutter/shell/platform/darwin/ios/ios_external_view_embedder.h"
19 #import "flutter/shell/platform/darwin/ios/ios_surface.h"
20 #import "flutter/shell/platform/darwin/ios/platform_message_handler_ios.h"
21 #import "flutter/shell/platform/darwin/ios/rendering_api_selection.h"
22
23 @class FlutterViewController;
24
25 namespace flutter {
26
27 /**
28 * A bridge connecting the platform agnostic shell and the iOS embedding.
29 *
30 * The shell provides and requests for UI related data and this PlatformView subclass fulfills
31 * it with iOS specific capabilities. As an example, the iOS embedding (the `FlutterEngine` and the
32 * `FlutterViewController`) sends pointer data to the shell and receives the shell's request for a
33 * Impeller AiksContext and supplies it.
34 *
35 * Despite the name "view", this class is unrelated to UIViews on iOS and doesn't have the same
36 * lifecycle. It's a long lived bridge owned by the `FlutterEngine` and can be attached and
37 * detached sequentially to multiple `FlutterViewController`s and `FlutterView`s.
38 */
39 class PlatformViewIOS final : public PlatformView {
40 public:
41 PlatformViewIOS(PlatformView::Delegate& delegate,
42 const std::shared_ptr<IOSContext>& context,
43 __weak FlutterPlatformViewsController* platform_views_controller,
44 const flutter::TaskRunners& task_runners);
45
46 explicit PlatformViewIOS(
47 PlatformView::Delegate& delegate,
48 IOSRenderingAPI rendering_api,
49 __weak FlutterPlatformViewsController* platform_views_controller,
50 const flutter::TaskRunners& task_runners,
51 const std::shared_ptr<fml::ConcurrentTaskRunner>& worker_task_runner,
52 const std::shared_ptr<const fml::SyncSwitch>& is_gpu_disabled_sync_switch);
53
54 ~PlatformViewIOS() override;
55
56 /**
57 * Returns the `FlutterViewController` currently attached to the `FlutterEngine` owning
58 * this PlatformViewIOS.
59 */
60 FlutterViewController* GetOwnerViewController() const __attribute__((cf_audited_transfer));
61
62 /**
63 * Updates the `FlutterViewController` currently attached to the `FlutterEngine` owning
64 * this PlatformViewIOS. This should be updated when the `FlutterEngine`
65 * is given a new `FlutterViewController`.
66 */
67 void SetOwnerViewController(__weak FlutterViewController* owner_controller);
68
69 /**
70 * Called one time per `FlutterViewController` when the `FlutterViewController`'s
71 * UIView is first loaded.
72 *
73 * Can be used to perform late initialization after `FlutterViewController`'s
74 * init.
75 */
76 void attachView();
77
78 /**
79 * Called through when an external texture such as video or camera is
80 * given to the `FlutterEngine` or `FlutterViewController`.
81 */
82 void RegisterExternalTexture(int64_t id, NSObject<FlutterTexture>* texture);
83
84 // |PlatformView|
85 PointerDataDispatcherMaker GetDispatcherMaker() override;
86
87 // |PlatformView|
88 void SetSemanticsEnabled(bool enabled) override;
89
90 // |PlatformView|
91 void HandlePlatformMessage(std::unique_ptr<flutter::PlatformMessage> message) override;
92
93 // |PlatformView|
94 std::unique_ptr<Surface> CreateRenderingSurface() override;
95
96 // |PlatformView|
97 std::shared_ptr<ExternalViewEmbedder> CreateExternalViewEmbedder() override;
98
99 // |PlatformView|
100 std::shared_ptr<impeller::Context> GetImpellerContext() const override;
101
102 // |PlatformView|
103 void SetAccessibilityFeatures(int32_t flags) override;
104
105 // |PlatformView|
106 void UpdateSemantics(int64_t view_id,
107 flutter::SemanticsNodeUpdates update,
108 flutter::CustomAccessibilityActionUpdates actions) override;
109
110 // |PlatformView|
111 std::unique_ptr<VsyncWaiter> CreateVSyncWaiter() override;
112
113 // |PlatformView|
114 void OnPreEngineRestart() const override;
115
116 // |PlatformView|
117 std::unique_ptr<std::vector<std::string>> ComputePlatformResolvedLocales(
118 const std::vector<std::string>& supported_locale_data) override;
119
120 /** Accessor for the `IOSContext` associated with the platform view. */
121 const std::shared_ptr<IOSContext>& GetIosContext() { return ios_context_; }
122
123 std::shared_ptr<PlatformMessageHandlerIos> GetPlatformMessageHandlerIos() const {
124 return platform_message_handler_;
125 }
126
127 std::shared_ptr<PlatformMessageHandler> GetPlatformMessageHandler() const override {
128 return platform_message_handler_;
129 }
130
131 private:
132 /// Smart pointer for use with objective-c observers.
133 /// This guarantees we remove the observer.
134 class ScopedObserver {
135 public:
136 ScopedObserver();
137 ~ScopedObserver();
138 void reset(id<NSObject> observer);
139 ScopedObserver(const ScopedObserver&) = delete;
140 ScopedObserver& operator=(const ScopedObserver&) = delete;
141
142 private:
143 id<NSObject> observer_ = nil;
144 };
145
146 /// Wrapper that guarantees we communicate clearing Accessibility
147 /// information to Dart.
148 class AccessibilityBridgeManager {
149 public:
150 explicit AccessibilityBridgeManager(const std::function<void(bool)>& set_semantics_enabled);
151 AccessibilityBridgeManager(const std::function<void(bool)>& set_semantics_enabled,
152 AccessibilityBridge* bridge);
153 explicit operator bool() const noexcept { return static_cast<bool>(accessibility_bridge_); }
154 AccessibilityBridge* get() const noexcept { return accessibility_bridge_.get(); }
155 void Set(std::unique_ptr<AccessibilityBridge> bridge);
156 void Clear();
157
158 private:
159 FML_DISALLOW_COPY_AND_ASSIGN(AccessibilityBridgeManager);
160 std::unique_ptr<AccessibilityBridge> accessibility_bridge_;
161 std::function<void(bool)> set_semantics_enabled_;
162 };
163
164 __weak FlutterViewController* owner_controller_;
165 // Since the `ios_surface_` is created on the platform thread but
166 // used on the raster thread we need to protect it with a mutex.
167 std::mutex ios_surface_mutex_;
168 std::unique_ptr<IOSSurface> ios_surface_;
169 std::shared_ptr<IOSContext> ios_context_;
170 __weak FlutterPlatformViewsController* platform_views_controller_;
171 AccessibilityBridgeManager accessibility_bridge_;
172 ScopedObserver dealloc_view_controller_observer_;
173 std::vector<std::string> platform_resolved_locale_;
174 std::shared_ptr<PlatformMessageHandlerIos> platform_message_handler_;
175
176 FML_DISALLOW_COPY_AND_ASSIGN(PlatformViewIOS);
177 };
178
179 } // namespace flutter
180
181 #endif // FLUTTER_SHELL_PLATFORM_DARWIN_IOS_PLATFORM_VIEW_IOS_H_
FlutterTexture.h
FlutterView.h
FlutterViewController.h
flutter::IOSContext
Manages the lifetime of the on-screen and off-screen rendering contexts on iOS. On-screen contexts ar...
Definition: ios_context.h:39
flutter::PlatformViewIOS
Definition: platform_view_ios.h:39
flutter::PlatformViewIOS::attachView
void attachView()
Definition: platform_view_ios.mm:115
flutter::PlatformViewIOS::CreateRenderingSurface
std::unique_ptr< Surface > CreateRenderingSurface() override
Definition: platform_view_ios.mm:142
flutter::PlatformViewIOS::GetPlatformMessageHandler
std::shared_ptr< PlatformMessageHandler > GetPlatformMessageHandler() const override
Definition: platform_view_ios.h:127
flutter::PlatformViewIOS::GetDispatcherMaker
PointerDataDispatcherMaker GetDispatcherMaker() override
Definition: platform_view_ios.mm:130
flutter::PlatformViewIOS::GetIosContext
const std::shared_ptr< IOSContext > & GetIosContext()
Definition: platform_view_ios.h:121
flutter::PlatformViewIOS::GetImpellerContext
std::shared_ptr< impeller::Context > GetImpellerContext() const override
Definition: platform_view_ios.mm:159
flutter::PlatformViewIOS::SetAccessibilityFeatures
void SetAccessibilityFeatures(int32_t flags) override
Definition: platform_view_ios.mm:181
flutter::PlatformViewIOS::UpdateSemantics
void UpdateSemantics(int64_t view_id, flutter::SemanticsNodeUpdates update, flutter::CustomAccessibilityActionUpdates actions) override
Definition: platform_view_ios.mm:186
flutter::PlatformViewIOS::CreateVSyncWaiter
std::unique_ptr< VsyncWaiter > CreateVSyncWaiter() override
Definition: platform_view_ios.mm:198
flutter::PlatformViewIOS::CreateExternalViewEmbedder
std::shared_ptr< ExternalViewEmbedder > CreateExternalViewEmbedder() override
Definition: platform_view_ios.mm:154
flutter::PlatformViewIOS::SetSemanticsEnabled
void SetSemanticsEnabled(bool enabled) override
Definition: platform_view_ios.mm:164
flutter::PlatformViewIOS::HandlePlatformMessage
void HandlePlatformMessage(std::unique_ptr< flutter::PlatformMessage > message) override
Definition: platform_view_ios.mm:76
flutter::PlatformViewIOS::PlatformViewIOS
PlatformViewIOS(PlatformView::Delegate &delegate, const std::shared_ptr< IOSContext > &context, __weak FlutterPlatformViewsController *platform_views_controller, const flutter::TaskRunners &task_runners)
Definition: platform_view_ios.mm:45
flutter::PlatformViewIOS::GetPlatformMessageHandlerIos
std::shared_ptr< PlatformMessageHandlerIos > GetPlatformMessageHandlerIos() const
Definition: platform_view_ios.h:123
flutter::PlatformViewIOS::GetOwnerViewController
FlutterViewController * GetOwnerViewController() const __attribute__((cf_audited_transfer))
Definition: platform_view_ios.mm:80
flutter::PlatformViewIOS::OnPreEngineRestart
void OnPreEngineRestart() const override
Definition: platform_view_ios.mm:202
flutter::PlatformViewIOS::SetOwnerViewController
void SetOwnerViewController(__weak FlutterViewController *owner_controller)
Definition: platform_view_ios.mm:84
flutter::PlatformViewIOS::RegisterExternalTexture
void RegisterExternalTexture(int64_t id, NSObject< FlutterTexture > *texture)
Definition: platform_view_ios.mm:136
flutter::PlatformViewIOS::~PlatformViewIOS
~PlatformViewIOS() override
flutter::PlatformViewIOS::ComputePlatformResolvedLocales
std::unique_ptr< std::vector< std::string > > ComputePlatformResolvedLocales(const std::vector< std::string > &supported_locale_data) override
Definition: platform_view_ios.mm:214
accessibility_bridge.h
FlutterPlatformViewsController
Definition: FlutterPlatformViewsController.h:31
FlutterTexture
Definition: FlutterMetalLayer.mm:61
FlutterViewController
Definition: FlutterViewController.h:57
ios_context.h
ios_external_view_embedder.h
ios_surface.h
flutter
Definition: accessibility_bridge.h:26
flutter::IOSRenderingAPI
IOSRenderingAPI
Definition: rendering_api_selection.h:14
impeller
Definition: ios_context.h:20
platform_message_handler_ios.h
rendering_api_selection.h