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FlutterPlatformViews_Internal.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_FRAMEWORK_SOURCE_FLUTTERPLATFORMVIEWS_INTERNAL_H_
6 #define FLUTTER_SHELL_PLATFORM_DARWIN_IOS_FRAMEWORK_SOURCE_FLUTTERPLATFORMVIEWS_INTERNAL_H_
7
8 #include "flutter/flow/embedded_views.h"
9 #include "flutter/fml/platform/darwin/scoped_nsobject.h"
10 #include "flutter/shell/common/shell.h"
11 #import "flutter/shell/platform/darwin/common/framework/Headers/FlutterBinaryMessenger.h"
12 #import "flutter/shell/platform/darwin/common/framework/Headers/FlutterChannels.h"
13 #import "flutter/shell/platform/darwin/ios/framework/Headers/FlutterPlatformViews.h"
14 #import "flutter/shell/platform/darwin/ios/framework/Headers/FlutterPlugin.h"
15 #import "flutter/shell/platform/darwin/ios/framework/Source/SemanticsObject.h"
16 #import "flutter/shell/platform/darwin/ios/ios_context.h"
17
18 @class FlutterTouchInterceptingView;
19
20 // A UIView that acts as a clipping mask for the |ChildClippingView|.
21 //
22 // On the [UIView drawRect:] method, this view performs a series of clipping operations and sets the
23 // alpha channel to the final resulting area to be 1; it also sets the "clipped out" area's alpha
24 // channel to be 0.
25 //
26 // When a UIView sets a |FlutterClippingMaskView| as its `maskView`, the alpha channel of the UIView
27 // is replaced with the alpha channel of the |FlutterClippingMaskView|.
28 @interface FlutterClippingMaskView : UIView
29
30 - (instancetype)initWithFrame:(CGRect)frame screenScale:(CGFloat)screenScale;
31
32 - (void)reset;
33
34 // Adds a clip rect operation to the queue.
35 //
36 // The `clipSkRect` is transformed with the `matrix` before adding to the queue.
37 - (void)clipRect:(const SkRect&)clipSkRect matrix:(const SkMatrix&)matrix;
38
39 // Adds a clip rrect operation to the queue.
40 //
41 // The `clipSkRRect` is transformed with the `matrix` before adding to the queue.
42 - (void)clipRRect:(const SkRRect&)clipSkRRect matrix:(const SkMatrix&)matrix;
43
44 // Adds a clip path operation to the queue.
45 //
46 // The `path` is transformed with the `matrix` before adding to the queue.
47 - (void)clipPath:(const SkPath&)path matrix:(const SkMatrix&)matrix;
48
49 @end
50
51 // A pool that provides |FlutterClippingMaskView|s.
52 //
53 // The pool has a capacity that can be set in the initializer.
54 // When requesting a FlutterClippingMaskView, the pool will first try to reuse an available maskView
55 // in the pool. If there are none available, a new FlutterClippingMaskView is constructed. If the
56 // capacity is reached, the newly constructed FlutterClippingMaskView is not added to the pool.
57 //
58 // Call |insertViewToPoolIfNeeded:| to return a maskView to the pool.
59 @interface FlutterClippingMaskViewPool : NSObject
60
61 // Initialize the pool with `capacity`. When the `capacity` is reached, a FlutterClippingMaskView is
62 // constructed when requested, and it is not added to the pool.
63 - (instancetype)initWithCapacity:(NSInteger)capacity;
64
65 // Reuse a maskView from the pool, or allocate a new one.
66 - (FlutterClippingMaskView*)getMaskViewWithFrame:(CGRect)frame;
67
68 // Insert the `maskView` into the pool.
69 - (void)insertViewToPoolIfNeeded:(FlutterClippingMaskView*)maskView;
70
71 @end
72
73 // An object represents a blur filter.
74 //
75 // This object produces a `backdropFilterView`.
76 // To blur a View, add `backdropFilterView` as a subView of the View.
77 @interface PlatformViewFilter : NSObject
78
79 // Determines the rect of the blur effect in the coordinate system of `backdropFilterView`'s
80 // parentView.
81 @property(assign, nonatomic, readonly) CGRect frame;
82
83 // Determines the blur intensity.
84 //
85 // It is set as the value of `inputRadius` of the `gaussianFilter` that is internally used.
86 @property(assign, nonatomic, readonly) CGFloat blurRadius;
87
88 // This is the view to use to blur the PlatformView.
89 //
90 // It is a modified version of UIKit's `UIVisualEffectView`.
91 // The inputRadius can be customized and it doesn't add any color saturation to the blurred view.
92 @property(nonatomic, retain, readonly) UIVisualEffectView* backdropFilterView;
93
94 // For testing only.
95 + (void)resetPreparation;
96
97 - (instancetype)init NS_UNAVAILABLE;
98
99 // Initialize the filter object.
100 //
101 // The `frame` determines the rect of the blur effect in the coordinate system of
102 // `backdropFilterView`'s parentView. The `blurRadius` determines the blur intensity. It is set as
103 // the value of `inputRadius` of the `gaussianFilter` that is internally used. The
104 // `UIVisualEffectView` is the view that is used to add the blur effects. It is modified to become
105 // `backdropFilterView`, which better supports the need of Flutter.
106 //
107 // Note: if the implementation of UIVisualEffectView changes in a way that affects the
108 // implementation in `PlatformViewFilter`, this method will return nil.
109 - (instancetype)initWithFrame:(CGRect)frame
110 blurRadius:(CGFloat)blurRadius
111 visualEffectView:(UIVisualEffectView*)visualEffectView NS_DESIGNATED_INITIALIZER;
112
113 @end
114
115 // The parent view handles clipping to its subViews.
116 @interface ChildClippingView : UIView
117
118 // Applies blur backdrop filters to the ChildClippingView with blur values from
119 // filters.
120 - (void)applyBlurBackdropFilters:(NSArray<PlatformViewFilter*>*)filters;
121
122 @end
123
124 namespace flutter {
125 // Converts a SkMatrix to CATransform3D.
126 // Certain fields are ignored in CATransform3D since SkMatrix is 3x3 and CATransform3D is 4x4.
127 CATransform3D GetCATransform3DFromSkMatrix(const SkMatrix& matrix);
128
129 // Reset the anchor of `layer` to match the transform operation from flow.
130 // The position of the `layer` should be unchanged after resetting the anchor.
131 void ResetAnchor(CALayer* layer);
132
133 CGRect GetCGRectFromSkRect(const SkRect& clipSkRect);
134 BOOL BlurRadiusEqualToBlurRadius(CGFloat radius1, CGFloat radius2);
135
136 class IOSContextGL;
137 class IOSSurface;
138
139 struct FlutterPlatformViewLayer {
140 FlutterPlatformViewLayer(const fml::scoped_nsobject<UIView>& overlay_view,
141 const fml::scoped_nsobject<UIView>& overlay_view_wrapper,
142 std::unique_ptr<IOSSurface> ios_surface,
143 std::unique_ptr<Surface> surface);
144
145 ~FlutterPlatformViewLayer();
146
147 fml::scoped_nsobject<UIView> overlay_view;
148 fml::scoped_nsobject<UIView> overlay_view_wrapper;
149 std::unique_ptr<IOSSurface> ios_surface;
150 std::unique_ptr<Surface> surface;
151
152 // Whether a frame for this layer was submitted.
153 bool did_submit_last_frame;
154
155 // The GrContext that is currently used by the overlay surfaces.
156 // We track this to know when the GrContext for the Flutter app has changed
157 // so we can update the overlay with the new context.
158 GrDirectContext* gr_context;
159 };
160
161 // This class isn't thread safe.
162 class FlutterPlatformViewLayerPool {
163 public:
164 FlutterPlatformViewLayerPool() = default;
165
166 ~FlutterPlatformViewLayerPool() = default;
167
168 // Gets a layer from the pool if available, or allocates a new one.
169 // Finally, it marks the layer as used. That is, it increments `available_layer_index_`.
170 std::shared_ptr<FlutterPlatformViewLayer> GetLayer(
171 GrDirectContext* gr_context,
172 const std::shared_ptr<IOSContext>& ios_context);
173
174 // Gets the layers in the pool that aren't currently used.
175 // This method doesn't mark the layers as unused.
176 std::vector<std::shared_ptr<FlutterPlatformViewLayer>> GetUnusedLayers();
177
178 // Marks the layers in the pool as available for reuse.
179 void RecycleLayers();
180
181 private:
182 // The index of the entry in the layers_ vector that determines the beginning of the unused
183 // layers. For example, consider the following vector:
184 // _____
185 // | 0 |
186 /// |---|
187 /// | 1 | <-- available_layer_index_
188 /// |---|
189 /// | 2 |
190 /// |---|
191 ///
192 /// This indicates that entries starting from 1 can be reused meanwhile the entry at position 0
193 /// cannot be reused.
194 size_t available_layer_index_ = 0;
195 std::vector<std::shared_ptr<FlutterPlatformViewLayer>> layers_;
196
197 FML_DISALLOW_COPY_AND_ASSIGN(FlutterPlatformViewLayerPool);
198 };
199
200 class FlutterPlatformViewsController {
201 public:
202 FlutterPlatformViewsController();
203
204 ~FlutterPlatformViewsController();
205
206 fml::WeakPtr<flutter::FlutterPlatformViewsController> GetWeakPtr();
207
208 void SetFlutterView(UIView* flutter_view);
209
210 void SetFlutterViewController(UIViewController* flutter_view_controller);
211
212 UIViewController* getFlutterViewController();
213
214 void RegisterViewFactory(
215 NSObject<FlutterPlatformViewFactory>* factory,
216 NSString* factoryId,
217 FlutterPlatformViewGestureRecognizersBlockingPolicy gestureRecognizerBlockingPolicy);
218
219 // Called at the beginning of each frame.
220 void BeginFrame(SkISize frame_size);
221
222 // Indicates that we don't compisite any platform views or overlays during this frame.
223 // Also reverts the composition_order_ to its original state at the beginning of the frame.
224 void CancelFrame();
225
226 void PrerollCompositeEmbeddedView(int64_t view_id,
227 std::unique_ptr<flutter::EmbeddedViewParams> params);
228
229 size_t EmbeddedViewCount();
230
231 // Returns the `FlutterPlatformView`'s `view` object associated with the view_id.
232 //
233 // If the `FlutterPlatformViewsController` does not contain any `FlutterPlatformView` object or
234 // a `FlutterPlatformView` object associated with the view_id cannot be found, the method
235 // returns nil.
236 UIView* GetPlatformViewByID(int64_t view_id);
237
238 // Returns the `FlutterTouchInterceptingView` with the view_id.
239 //
240 // If the `FlutterPlatformViewsController` does not contain any `FlutterPlatformView` object or
241 // a `FlutterPlatformView` object associated with the view_id cannot be found, the method
242 // returns nil.
243 FlutterTouchInterceptingView* GetFlutterTouchInterceptingViewByID(int64_t view_id);
244
245 PostPrerollResult PostPrerollAction(
246 const fml::RefPtr<fml::RasterThreadMerger>& raster_thread_merger);
247
248 void EndFrame(bool should_resubmit_frame,
249 const fml::RefPtr<fml::RasterThreadMerger>& raster_thread_merger);
250
251 DlCanvas* CompositeEmbeddedView(int64_t view_id);
252
253 // The rect of the platform view at index view_id. This rect has been translated into the
254 // host view coordinate system. Units are device screen pixels.
255 SkRect GetPlatformViewRect(int64_t view_id);
256
257 // Discards all platform views instances and auxiliary resources.
258 void Reset();
259
260 bool SubmitFrame(GrDirectContext* gr_context,
261 const std::shared_ptr<IOSContext>& ios_context,
262 std::unique_ptr<SurfaceFrame> frame);
263
264 void OnMethodCall(FlutterMethodCall* call, FlutterResult& result);
265
266 // Returns the platform view id if the platform view (or any of its descendant view) is the first
267 // responder. Returns -1 if no such platform view is found.
268 long FindFirstResponderPlatformViewId();
269
270 // Pushes backdrop filter mutation to the mutator stack of each visited platform view.
271 void PushFilterToVisitedPlatformViews(const std::shared_ptr<const DlImageFilter>& filter,
272 const SkRect& filter_rect);
273
274 // Pushes the view id of a visted platform view to the list of visied platform views.
275 void PushVisitedPlatformView(int64_t view_id) { visited_platform_views_.push_back(view_id); }
276
277 private:
278 static const size_t kMaxLayerAllocations = 2;
279
280 using LayersMap = std::map<int64_t, std::vector<std::shared_ptr<FlutterPlatformViewLayer>>>;
281
282 void OnCreate(FlutterMethodCall* call, FlutterResult& result);
283 void OnDispose(FlutterMethodCall* call, FlutterResult& result);
284 void OnAcceptGesture(FlutterMethodCall* call, FlutterResult& result);
285 void OnRejectGesture(FlutterMethodCall* call, FlutterResult& result);
286 // Dispose the views in `views_to_dispose_`.
287 void DisposeViews();
288
289 // Returns true if there are embedded views in the scene at current frame
290 // Or there will be embedded views in the next frame.
291 // TODO(cyanglaz): https://github.com/flutter/flutter/issues/56474
292 // Make this method check if there are pending view operations instead.
293 // Also rename it to `HasPendingViewOperations`.
294 bool HasPlatformViewThisOrNextFrame();
295
296 // Traverse the `mutators_stack` and return the number of clip operations.
297 int CountClips(const MutatorsStack& mutators_stack);
298
299 void ClipViewSetMaskView(UIView* clipView);
300
301 // Applies the mutators in the mutators_stack to the UIView chain that was constructed by
302 // `ReconstructClipViewsChain`
303 //
304 // Clips are applied to the `embedded_view`'s super view(|ChildClippingView|) using a
305 // |FlutterClippingMaskView|. Transforms are applied to `embedded_view`
306 //
307 // The `bounding_rect` is the final bounding rect of the PlatformView
308 // (EmbeddedViewParams::finalBoundingRect). If a clip mutator's rect contains the final bounding
309 // rect of the PlatformView, the clip mutator is not applied for performance optimization.
310 void ApplyMutators(const MutatorsStack& mutators_stack,
311 UIView* embedded_view,
312 const SkRect& bounding_rect);
313
314 void CompositeWithParams(int64_t view_id, const EmbeddedViewParams& params);
315
316 // Allocates a new FlutterPlatformViewLayer if needed, draws the pixels within the rect from
317 // the picture on the layer's canvas.
318 std::shared_ptr<FlutterPlatformViewLayer> GetLayer(GrDirectContext* gr_context,
319 const std::shared_ptr<IOSContext>& ios_context,
320 EmbedderViewSlice* slice,
321 SkRect rect,
322 int64_t view_id,
323 int64_t overlay_id);
324 // Removes overlay views and platform views that aren't needed in the current frame.
325 // Must run on the platform thread.
326 void RemoveUnusedLayers();
327 // Appends the overlay views and platform view and sets their z index based on the composition
328 // order.
329 void BringLayersIntoView(LayersMap layer_map);
330
331 // Begin a CATransaction.
332 // This transaction needs to be balanced with |CommitCATransactionIfNeeded|.
333 void BeginCATransaction();
334
335 // Commit a CATransaction if |BeginCATransaction| has been called during the frame.
336 void CommitCATransactionIfNeeded();
337
338 // Resets the state of the frame.
339 void ResetFrameState();
340
341 // The pool of reusable view layers. The pool allows to recycle layer in each frame.
342 std::unique_ptr<FlutterPlatformViewLayerPool> layer_pool_;
343
344 // The platform view's |EmbedderViewSlice| keyed off the view id, which contains any subsequent
345 // operation until the next platform view or the end of the last leaf node in the layer tree.
346 //
347 // The Slices are deleted by the FlutterPlatformViewsController.reset().
348 std::map<int64_t, std::unique_ptr<EmbedderViewSlice>> slices_;
349
350 fml::scoped_nsobject<FlutterMethodChannel> channel_;
351 fml::scoped_nsobject<UIView> flutter_view_;
352 fml::scoped_nsobject<UIViewController> flutter_view_controller_;
353 fml::scoped_nsobject<FlutterClippingMaskViewPool> mask_view_pool_;
354 std::map<std::string, fml::scoped_nsobject<NSObject<FlutterPlatformViewFactory>>> factories_;
355 std::map<int64_t, fml::scoped_nsobject<NSObject<FlutterPlatformView>>> views_;
356 std::map<int64_t, fml::scoped_nsobject<FlutterTouchInterceptingView>> touch_interceptors_;
357 // Mapping a platform view ID to the top most parent view (root_view) of a platform view. In
358 // |SubmitFrame|, root_views_ are added to flutter_view_ as child views.
359 //
360 // The platform view with the view ID is a child of the root view; If the platform view is not
361 // clipped, and no clipping view is added, the root view will be the intercepting view.
362 std::map<int64_t, fml::scoped_nsobject<UIView>> root_views_;
363 // Mapping a platform view ID to its latest composition params.
364 std::map<int64_t, EmbeddedViewParams> current_composition_params_;
365 // Mapping a platform view ID to the count of the clipping operations that were applied to the
366 // platform view last time it was composited.
367 std::map<int64_t, int64_t> clip_count_;
368 SkISize frame_size_;
369
370 // The number of frames the rasterizer task runner will continue
371 // to run on the platform thread after no platform view is rendered.
372 //
373 // Note: this is an arbitrary number that attempts to account for cases
374 // where the platform view might be momentarily off the screen.
375 static const int kDefaultMergedLeaseDuration = 10;
376
377 // Method channel `OnDispose` calls adds the views to be disposed to this set to be disposed on
378 // the next frame.
379 std::unordered_set<int64_t> views_to_dispose_;
380
381 // A vector of embedded view IDs according to their composition order.
382 // The last ID in this vector belond to the that is composited on top of all others.
383 std::vector<int64_t> composition_order_;
384
385 // A vector of visited platform view IDs.
386 std::vector<int64_t> visited_platform_views_;
387
388 // The latest composition order that was presented in Present().
389 std::vector<int64_t> active_composition_order_;
390
391 // Only compoiste platform views in this set.
392 std::unordered_set<int64_t> views_to_recomposite_;
393
394 // The FlutterPlatformViewGestureRecognizersBlockingPolicy for each type of platform view.
395 std::map<std::string, FlutterPlatformViewGestureRecognizersBlockingPolicy>
396 gesture_recognizers_blocking_policies;
397
398 bool catransaction_added_ = false;
399
400 // WeakPtrFactory must be the last member.
401 std::unique_ptr<fml::WeakPtrFactory<FlutterPlatformViewsController>> weak_factory_;
402
403 #if FLUTTER_RUNTIME_MODE == FLUTTER_RUNTIME_MODE_DEBUG
404 // A set to keep track of embedded views that does not have (0, 0) origin.
405 // An insertion triggers a warning message about non-zero origin logged on the debug console.
406 // See https://github.com/flutter/flutter/issues/109700 for details.
407 std::unordered_set<int64_t> non_zero_origin_views_;
408 #endif
409
410 FML_DISALLOW_COPY_AND_ASSIGN(FlutterPlatformViewsController);
411 };
412
413 } // namespace flutter
414
415 // A UIView that is used as the parent for embedded UIViews.
416 //
417 // This view has 2 roles:
418 // 1. Delay or prevent touch events from arriving the embedded view.
419 // 2. Dispatching all events that are hittested to the embedded view to the FlutterView.
420 @interface FlutterTouchInterceptingView : UIView
421 - (instancetype)initWithEmbeddedView:(UIView*)embeddedView
422 platformViewsController:
423 (fml::WeakPtr<flutter::FlutterPlatformViewsController>)platformViewsController
424 gestureRecognizersBlockingPolicy:
425 (FlutterPlatformViewGestureRecognizersBlockingPolicy)blockingPolicy;
426
427 // Stop delaying any active touch sequence (and let it arrive the embedded view).
428 - (void)releaseGesture;
429
430 // Prevent the touch sequence from ever arriving to the embedded view.
431 - (void)blockGesture;
432
433 // Get embedded view
434 - (UIView*)embeddedView;
435
436 // Sets flutterAccessibilityContainer as this view's accessibilityContainer.
437 - (void)setFlutterAccessibilityContainer:(NSObject*)flutterAccessibilityContainer;
438 @end
439
440 @interface UIView (FirstResponder)
441 // Returns YES if a view or any of its descendant view is the first responder. Returns NO otherwise.
442 @property(nonatomic, readonly) BOOL flt_hasFirstResponderInViewHierarchySubtree;
443 @end
444
445 #endif // FLUTTER_SHELL_PLATFORM_DARWIN_IOS_FRAMEWORK_SOURCE_FLUTTERPLATFORMVIEWS_INTERNAL_H_
UIView(FirstResponder)::flt_hasFirstResponderInViewHierarchySubtree
BOOL flt_hasFirstResponderInViewHierarchySubtree
Definition: FlutterPlatformViews_Internal.h:442
FlutterPlatformViews.h
flutter::FlutterPlatformViewLayer::ios_surface
std::unique_ptr< IOSSurface > ios_surface
Definition: FlutterPlatformViews_Internal.h:149
-[FlutterTouchInterceptingView blockGesture]
void blockGesture()
Definition: FlutterPlatformViews.mm:1008
-[FlutterTouchInterceptingView releaseGesture]
void releaseGesture()
Definition: FlutterPlatformViews.mm:1004
PlatformViewFilter::frame
CGRect frame
Definition: FlutterPlatformViews_Internal.h:81
flutter::FlutterPlatformViewLayer::did_submit_last_frame
bool did_submit_last_frame
Definition: FlutterPlatformViews_Internal.h:153
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BOOL BlurRadiusEqualToBlurRadius(CGFloat radius1, CGFloat radius2)
Definition: FlutterPlatformViews_Internal.mm:67
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-[FlutterTouchInterceptingView embeddedView]
UIView * embeddedView()
Definition: FlutterPlatformViews.mm:1000
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fml::scoped_nsobject< UIView > overlay_view_wrapper
Definition: FlutterPlatformViews_Internal.h:148
initWithFrame
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Definition: FlutterTextInputPlugin.h:164
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Definition: FlutterPlatformViews_Internal.h:158
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Definition: FlutterPlatformViews_Internal.mm:56
FlutterPlugin.h
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CGFloat blurRadius
Definition: FlutterPlatformViews_Internal.h:86
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Definition: FlutterPlatformViews_Internal.h:162
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Definition: FlutterPlatformViews_Internal.h:147
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instancetype NS_UNAVAILABLE()
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-[FlutterClippingMaskView reset]
void reset()
Definition: FlutterPlatformViews_Internal.mm:278
PlatformViewFilter::backdropFilterView
UIVisualEffectView * backdropFilterView
Definition: FlutterPlatformViews_Internal.h:92
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Definition: FlutterPlatformViews_Internal.h:139
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void(^ FlutterResult)(id _Nullable result)
Definition: FlutterChannels.h:196
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Definition: FlutterPlatformViews_Internal.h:150
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Definition: FlutterPlatformViews.mm:20
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Definition: FlutterPlatformViews_Internal.h:116
-[flutter::FlutterPlatformViewsController PushVisitedPlatformView]
void PushVisitedPlatformView(int64_t view_id)
Definition: FlutterPlatformViews_Internal.h:275
SemanticsObject.h
+[PlatformViewFilter resetPreparation]
void resetPreparation()
Definition: FlutterPlatformViews_Internal.mm:114
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Definition: FlutterPlatformViews.mm:961
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CATransform3D GetCATransform3DFromSkMatrix(const SkMatrix &matrix)
Definition: FlutterPlatformViews_Internal.mm:41
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Definition: FlutterPlatformViews_Internal.h:28