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[ASViewController] Allow VC to conform to range updating protocol, log message if impossible to update

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This commit is contained in:
Adlai Holler
2016-07-14 10:56:52 -07:00
parent 6c8292470b
commit 3591f7a7c1
2 changed files with 26 additions and 6 deletions
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25
AsyncDisplayKit/ASViewController.mm
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@@ -27,6 +27,9 @@
BOOL _automaticallyAdjustRangeModeBasedOnViewEvents;
BOOL _parentManagesVisibilityDepth;
NSInteger _visibilityDepth;
BOOL _selfConformsToRangeModeProtocol;
BOOL _nodeConformsToRangeModeProtocol;
BOOL _didCheckRangeModeProtocolConformance;
}
- (instancetype)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
@@ -172,17 +175,29 @@ ASVisibilityDepthImplementation;
- (void)setAutomaticallyAdjustRangeModeBasedOnViewEvents:(BOOL)automaticallyAdjustRangeModeBasedOnViewEvents
{
_automaticallyAdjustRangeModeBasedOnViewEvents = automaticallyAdjustRangeModeBasedOnViewEvents;
if (automaticallyAdjustRangeModeBasedOnViewEvents && !_didCheckRangeModeProtocolConformance) {
_selfConformsToRangeModeProtocol = [self conformsToProtocol:@protocol(ASRangeControllerUpdateRangeProtocol)];
_nodeConformsToRangeModeProtocol = [_node conformsToProtocol:@protocol(ASRangeControllerUpdateRangeProtocol)];
_didCheckRangeModeProtocolConformance = YES;
if (!_selfConformsToRangeModeProtocol && !_nodeConformsToRangeModeProtocol) {
NSLog(@"Warning: automaticallyAdjustRangeModeBasedOnViewEvents set to YES in %@, but range mode updating is not possible because neither view controller nor node %@ conform to ASRangeControllerUpdateRangeProtocol.", self, _node);
}
}
}
- (void)updateCurrentRangeModeWithModeIfPossible:(ASLayoutRangeMode)rangeMode
{
if (!_automaticallyAdjustRangeModeBasedOnViewEvents) { return; }
if (![_node conformsToProtocol:@protocol(ASRangeControllerUpdateRangeProtocol)]) {
return;
if (_selfConformsToRangeModeProtocol) {
id<ASRangeControllerUpdateRangeProtocol> rangeUpdater = (id<ASRangeControllerUpdateRangeProtocol>)self;
[rangeUpdater updateCurrentRangeWithMode:rangeMode];
}
if (_nodeConformsToRangeModeProtocol) {
id<ASRangeControllerUpdateRangeProtocol> rangeUpdater = (id<ASRangeControllerUpdateRangeProtocol>)_node;
[rangeUpdater updateCurrentRangeWithMode:rangeMode];
}
id<ASRangeControllerUpdateRangeProtocol> updateRangeNode = (id<ASRangeControllerUpdateRangeProtocol>)_node;
[updateRangeNode updateCurrentRangeWithMode:rangeMode];
}
#pragma mark - Layout Helpers