RCTSurfaceHostingComponentController.mm
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/**
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
#import "RCTSurfaceHostingComponentController.h"
#import <ComponentKit/CKComponentSubclass.h>
#import <React/RCTAssert.h>
#import <React/RCTSurface.h>
#import <React/RCTSurfaceDelegate.h>
#import <React/RCTSurfaceView.h>
#import "RCTSurfaceHostingComponent+Internal.h"
#import "RCTSurfaceHostingComponent.h"
#import "RCTSurfaceHostingComponentState.h"
@interface RCTSurfaceHostingComponentController() <RCTSurfaceDelegate>
@end
@implementation RCTSurfaceHostingComponentController {
RCTSurface *_surface;
}
- (instancetype)initWithComponent:(RCTSurfaceHostingComponent *)component
{
if (self = [super initWithComponent:component]) {
[self updateSurfaceWithComponent:component];
}
return self;
}
#pragma mark - Lifecycle
- (void)didMount
{
[super didMount];
[self mountSurfaceView];
}
- (void)didRemount
{
[super didRemount];
[self mountSurfaceView];
}
- (void)didUpdateComponent
{
[super didUpdateComponent];
[self updateSurfaceWithComponent:(RCTSurfaceHostingComponent *)self.component];
}
- (void)didUnmount
{
[super didUnmount];
[self unmountSurfaceView];
}
#pragma mark - Helpers
- (void)updateSurfaceWithComponent:(RCTSurfaceHostingComponent *)component
{
// Updating `surface`
RCTSurface *const surface = component.surface;
if (surface != _surface) {
if (_surface.delegate == self) {
_surface.delegate = nil;
}
_surface = surface;
_surface.delegate = self;
}
}
- (void)setIntrinsicSize:(CGSize)intrinsicSize
{
[self.component updateState:^(RCTSurfaceHostingComponentState *state) {
return [RCTSurfaceHostingComponentState newWithStage:state.stage
intrinsicSize:intrinsicSize];
} mode:[self suitableStateUpdateMode]];
}
- (void)setStage:(RCTSurfaceStage)stage
{
[self.component updateState:^(RCTSurfaceHostingComponentState *state) {
return [RCTSurfaceHostingComponentState newWithStage:stage
intrinsicSize:state.intrinsicSize];
} mode:[self suitableStateUpdateMode]];
}
- (CKUpdateMode)suitableStateUpdateMode
{
return ((RCTSurfaceHostingComponent *)self.component).options.synchronousStateUpdates && RCTIsMainQueue() ? CKUpdateModeSynchronous : CKUpdateModeAsynchronous;
}
- (void)mountSurfaceView
{
UIView *const surfaceView = _surface.view;
const CKComponentViewContext &context = [[self component] viewContext];
UIView *const superview = context.view;
superview.clipsToBounds = YES;
RCTAssert([superview.subviews count] <= 1, @"Should never have more than a single stateful subview.");
UIView *const existingSurfaceView = [superview.subviews lastObject];
if (existingSurfaceView != surfaceView) {
[existingSurfaceView removeFromSuperview];
surfaceView.frame = superview.bounds;
surfaceView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
[superview addSubview:surfaceView];
}
}
- (void)unmountSurfaceView
{
const CKComponentViewContext &context = [[self component] viewContext];
UIView *const superview = context.view;
RCTAssert([superview.subviews count] <= 1, @"Should never have more than a single stateful subview.");
UIView *const existingSurfaceView = [superview.subviews lastObject];
[existingSurfaceView removeFromSuperview];
}
#pragma mark - RCTSurfaceDelegate
- (void)surface:(RCTSurface *)surface didChangeIntrinsicSize:(CGSize)intrinsicSize
{
[self setIntrinsicSize:intrinsicSize];
}
- (void)surface:(RCTSurface *)surface didChangeStage:(RCTSurfaceStage)stage
{
[self setStage:stage];
}
@end