127 lines
4.1 KiB
Objective-C
127 lines
4.1 KiB
Objective-C
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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#import "RCTMapManager.h"
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#import "RCTBridge.h"
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#import "RCTEventDispatcher.h"
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#import "RCTMap.h"
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#import "UIView+ReactKit.h"
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@interface RCTMapManager() <MKMapViewDelegate>
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@end
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@implementation RCTMapManager
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- (UIView *)view
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{
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RCTMap *map = [[RCTMap alloc] init];
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map.delegate = self;
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return map;
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}
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RCT_EXPORT_VIEW_PROPERTY(showsUserLocation);
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RCT_EXPORT_VIEW_PROPERTY(zoomEnabled);
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RCT_EXPORT_VIEW_PROPERTY(rotateEnabled);
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RCT_EXPORT_VIEW_PROPERTY(pitchEnabled);
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RCT_EXPORT_VIEW_PROPERTY(scrollEnabled);
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RCT_EXPORT_VIEW_PROPERTY(maxDelta);
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RCT_EXPORT_VIEW_PROPERTY(minDelta);
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RCT_EXPORT_VIEW_PROPERTY(legalLabelInsets);
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RCT_REMAP_VIEW_PROPERTY(region, JSONRegion)
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#pragma mark MKMapViewDelegate
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- (void)mapView:(RCTMap *)mapView didUpdateUserLocation:(MKUserLocation *)location
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{
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if (mapView.followUserLocation) {
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MKCoordinateRegion region;
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region.span.latitudeDelta = RCTMapDefaultSpan;
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region.span.longitudeDelta = RCTMapDefaultSpan;
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region.center = location.coordinate;
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[mapView setRegion:region animated:YES];
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// Move to user location only for the first time it loads up.
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mapView.followUserLocation = NO;
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}
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}
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- (void)mapView:(RCTMap *)mapView regionWillChangeAnimated:(BOOL)animated
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{
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[self _regionChanged:mapView];
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mapView.regionChangeObserveTimer = [NSTimer timerWithTimeInterval:RCTMapRegionChangeObserveInterval
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target:self
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selector:@selector(_onTick:)
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userInfo:@{ @"mapView": mapView }
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repeats:YES];
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[[NSRunLoop mainRunLoop] addTimer:mapView.regionChangeObserveTimer forMode:NSRunLoopCommonModes];
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}
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- (void)mapView:(RCTMap *)mapView regionDidChangeAnimated:(BOOL)animated
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{
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[mapView.regionChangeObserveTimer invalidate];
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mapView.regionChangeObserveTimer = nil;
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[self _regionChanged:mapView];
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[self _emitRegionChangeEvent:mapView continuous:NO];
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}
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#pragma mark Private
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- (void)_onTick:(NSTimer *)timer
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{
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[self _regionChanged:timer.userInfo[@"mapView"]];
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}
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- (void)_regionChanged:(RCTMap *)mapView
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{
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BOOL needZoom = NO;
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CGFloat newLongitudeDelta = 0.0f;
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MKCoordinateRegion region = mapView.region;
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// On iOS 7, it's possible that we observe invalid locations during initialization of the map.
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// Filter those out.
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if (!CLLocationCoordinate2DIsValid(region.center)) {
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return;
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}
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// Calculation on float is not 100% accurate. If user zoom to max/min and then move, it's likely the map will auto zoom to max/min from time to time.
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// So let's try to make map zoom back to 99% max or 101% min so that there are some buffer that moving the map won't constantly hitting the max/min bound.
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if (mapView.maxDelta > FLT_EPSILON && region.span.longitudeDelta > mapView.maxDelta) {
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needZoom = YES;
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newLongitudeDelta = mapView.maxDelta * (1 - RCTMapZoomBoundBuffer);
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} else if (mapView.minDelta > FLT_EPSILON && region.span.longitudeDelta < mapView.minDelta) {
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needZoom = YES;
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newLongitudeDelta = mapView.minDelta * (1 + RCTMapZoomBoundBuffer);
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}
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if (needZoom) {
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region.span.latitudeDelta = region.span.latitudeDelta / region.span.longitudeDelta * newLongitudeDelta;
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region.span.longitudeDelta = newLongitudeDelta;
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mapView.region = region;
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}
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// Continously observe region changes
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[self _emitRegionChangeEvent:mapView continuous:YES];
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}
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- (void)_emitRegionChangeEvent:(RCTMap *)mapView continuous:(BOOL)continuous
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{
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NSDictionary *region = mapView.JSONRegion;
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if (region) {
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NSDictionary *event = @{
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@"target": [mapView reactTag],
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@"continuous": @(continuous),
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@"region": mapView.JSONRegion,
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};
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[self.bridge.eventDispatcher sendInputEventWithName:@"topChange" body:event];
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}
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}
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@end
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