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AsyncDisplayKit/AsyncDisplayKit/ASTableView.mm at master · yangbogithub/AsyncDisplayKit · GitHub
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/*
Copyright (c) 2014-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
#
import
"
ASTableView.h
"
#
import
"
ASAssert.h
"
#
import
"
ASDataController.h
"
#
import
"
ASFlowLayoutController.h
"
#
import
"
ASLayoutController.h
"
#
import
"
ASRangeController.h
"
#
import
"
ASDisplayNodeInternal.h
"
#
pragma mark
-
#
pragma mark
Proxying.
/*
*
* ASTableView intercepts and/or overrides a few of UITableView's critical data source and delegate methods.
*
* Any selector included in this function *MUST* be implemented by ASTableView.
*/
static
BOOL
_isInterceptedSelector
(
SEL
sel)
{
return
(
//
handled by ASTableView node<->cell machinery
sel ==
@selector
(
tableView:cellForRowAtIndexPath:
) ||
sel ==
@selector
(
tableView:heightForRowAtIndexPath:
) ||
//
handled by ASRangeController
sel ==
@selector
(
numberOfSectionsInTableView:
) ||
sel ==
@selector
(
tableView:numberOfRowsInSection:
) ||
//
used for ASRangeController visibility updates
sel ==
@selector
(
tableView:willDisplayCell:forRowAtIndexPath:
) ||
sel ==
@selector
(
tableView:didEndDisplayingCell:forRowAtIndexPath:
)
);
}
/*
*
* Stand-in for UITableViewDataSource and UITableViewDelegate. Any method calls we intercept are routed to ASTableView;
* everything else leaves AsyncDisplayKit safely and arrives at the original intended data source and delegate.
*/
@interface
_ASTableViewProxy
:
NSProxy
- (
instancetype
)
initWithTarget
:
(
id
<
NSObject
>)
target
interceptor
:
(ASTableView *)
interceptor
;
@end
@implementation
_ASTableViewProxy
{
id
<
NSObject
> __weak _target;
ASTableView * __weak _interceptor;
}
- (
instancetype
)
initWithTarget
:
(
id
<
NSObject
>)
target
interceptor
:
(ASTableView *)
interceptor
{
//
-[NSProxy init] is undefined
if
(!self) {
return
nil
;
}
ASDisplayNodeAssert
(target,
@"
target must not be nil
"
);
ASDisplayNodeAssert
(interceptor,
@"
interceptor must not be nil
"
);
_target = target;
_interceptor = interceptor;
return
self;
}
- (
BOOL
)
respondsToSelector
:
(
SEL
)
aSelector
{
return
(
_isInterceptedSelector
(aSelector) || [_target
respondsToSelector:
aSelector]);
}
- (
id
)
forwardingTargetForSelector
:
(
SEL
)
aSelector
{
if
(
_isInterceptedSelector
(aSelector)) {
return
_interceptor;
}
return
[_target
respondsToSelector:
aSelector] ? _target :
nil
;
}
@end
#
pragma mark
-
#
pragma mark
ASCellNode<->UITableViewCell bridging.
@interface
_ASTableViewCell
:
UITableViewCell
@end
@implementation
_ASTableViewCell
//
TODO add assertions to prevent use of view-backed UITableViewCell properties (eg .textLabel)
@end
#
pragma mark
-
#
pragma mark
ASTableView.
@interface
ASTableView
() <ASRangeControllerDelegate, ASDataControllerSource> {
_ASTableViewProxy *_proxyDataSource;
_ASTableViewProxy *_proxyDelegate;
ASDataController *_dataController;
ASFlowLayoutController *_layoutController;
ASRangeController *_rangeController;
}
@end
@implementation
ASTableView
#
pragma mark
-
#
pragma mark
Lifecycle.
- (
instancetype
)
initWithFrame
:
(CGRect)
frame
style
:
(UITableViewStyle)
style
{
if
(!(self = [
super
initWithFrame:
frame
style:
style]))
return
nil
;
_layoutController = [[ASFlowLayoutController
alloc
]
initWithScrollOption:
ASFlowLayoutDirectionVertical];
_rangeController = [[ASRangeController
alloc
]
init
];
_rangeController.
layoutController
= _layoutController;
_rangeController.
delegate
= self;
_dataController = [[ASDataController
alloc
]
init
];
_dataController.
dataSource
= self;
_dataController.
delegate
= _rangeController;
return
self;
}
#
pragma mark
-
#
pragma mark
Overrides.
- (
void
)
setDataSource
:
(
id
<UITableViewDataSource>)
dataSource
{
ASDisplayNodeAssert
(
NO
,
@"
ASTableView uses asyncDataSource, not UITableView's dataSource property.
"
);
}
- (
void
)
setDelegate
:
(
id
<UITableViewDelegate>)
delegate
{
//
Our UIScrollView superclass sets its delegate to nil on dealloc. Only assert if we get a non-nil value here.
ASDisplayNodeAssert
(delegate ==
nil
,
@"
ASTableView uses asyncDelegate, not UITableView's delegate property.
"
);
}
- (
void
)
setAsyncDataSource
:
(
id
<ASTableViewDataSource>)
asyncDataSource
{
if
(_asyncDataSource == asyncDataSource)
return
;
if
(asyncDataSource ==
nil
) {
_asyncDataSource =
nil
;
_proxyDataSource =
nil
;
super.
dataSource
=
nil
;
}
else
{
_asyncDataSource = asyncDataSource;
_proxyDataSource = [[_ASTableViewProxy
alloc
]
initWithTarget:
_asyncDataSource
interceptor:
self
];
super.
dataSource
= (
id
<UITableViewDataSource>)_proxyDataSource;
}
}
- (
void
)
setAsyncDelegate
:
(
id
<ASTableViewDelegate>)
asyncDelegate
{
if
(_asyncDelegate == asyncDelegate)
return
;
if
(asyncDelegate ==
nil
) {
_asyncDelegate =
nil
;
_proxyDelegate =
nil
;
super.
delegate
=
nil
;
}
else
{
_asyncDelegate = asyncDelegate;
_proxyDelegate = [[_ASTableViewProxy
alloc
]
initWithTarget:
_asyncDelegate
interceptor:
self
];
super.
delegate
= (
id
<UITableViewDelegate>)_proxyDelegate;
}
}
- (
void
)
reloadData
{
ASDisplayNodePerformBlockOnMainThread
(^{
[
super
reloadData
];
});
[_dataController
reloadData
];
}
- (ASRangeTuningParameters)
rangeTuningParameters
{
return
_layoutController.
tuningParameters
;
}
- (
void
)
setRangeTuningParameters
:
(ASRangeTuningParameters)
tuningParameters
{
_layoutController.
tuningParameters
= tuningParameters;
}
#
pragma mark
Assertions.
- (
void
)
throwUnimplementedException
{
[[
NSException
exceptionWithName:
@"
UnimplementedException
"
reason:
@"
ASTableView's grouped updates aren't currently supported yet, please call the insert/delete function directly.
"
userInfo:
nil
]
raise
];
}
- (
void
)
beginUpdates
{
[
self
throwUnimplementedException
];
}
- (
void
)
endUpdates
{
[
self
throwUnimplementedException
];
}
- (
void
)
insertSections
:
(
NSIndexSet
*)
sections
withRowAnimation
:
(UITableViewRowAnimation)
animation
{
[_dataController
insertSections:
sections];
}
- (
void
)
deleteSections
:
(
NSIndexSet
*)
sections
withRowAnimation
:
(UITableViewRowAnimation)
animation
{
[_dataController
deleteSections:
sections];
}
- (
void
)
reloadSections
:
(
NSIndexSet
*)
sections
withRowAnimation
:
(UITableViewRowAnimation)
animation
{
[_dataController
reloadSections:
sections];
}
- (
void
)
moveSection
:
(
NSInteger
)
section
toSection
:
(
NSInteger
)
newSection
{
[_dataController
moveSection:
section
toSection:
newSection];
}
- (
void
)
insertRowsAtIndexPaths
:
(
NSArray
*)
indexPaths
withRowAnimation
:
(UITableViewRowAnimation)
animation
{
[_dataController
insertRowsAtIndexPaths:
indexPaths];
}
- (
void
)
deleteRowsAtIndexPaths
:
(
NSArray
*)
indexPaths
withRowAnimation
:
(UITableViewRowAnimation)
animation
{
[_dataController
deleteRowsAtIndexPaths:
indexPaths];
}
- (
void
)
reloadRowsAtIndexPaths
:
(
NSArray
*)
indexPaths
withRowAnimation
:
(UITableViewRowAnimation)
animation
{
[_dataController
reloadRowsAtIndexPaths:
indexPaths];
}
- (
void
)
moveRowAtIndexPath
:
(
NSIndexPath
*)
indexPath
toIndexPath
:
(
NSIndexPath
*)
newIndexPath
{
[_dataController
moveRowAtIndexPath:
indexPath
toIndexPath:
newIndexPath];
}
#
pragma mark
-
#
pragma mark
Intercepted selectors.
- (UITableViewCell *)
tableView
:
(UITableView *)
tableView
cellForRowAtIndexPath
:
(
NSIndexPath
*)
indexPath
{
static
NSString
*reuseIdentifier =
@"
_ASTableViewCell
"
;
_ASTableViewCell *cell = [
self
dequeueReusableCellWithIdentifier:
reuseIdentifier];
if
(!cell) {
cell = [[_ASTableViewCell
alloc
]
initWithStyle:
UITableViewCellStyleDefault
reuseIdentifier:
reuseIdentifier];
}
ASCellNode *node = [_dataController
nodeAtIndexPath:
indexPath];
[_rangeController
configureContentView:
cell.contentView
forCellNode:
node];
cell.
backgroundColor
= node.
backgroundColor
;
cell.
selectionStyle
= node.
selectionStyle
;
return
cell;
}
- (CGFloat)
tableView
:
(UITableView *)
tableView
heightForRowAtIndexPath
:
(
NSIndexPath
*)
indexPath
{
ASCellNode *node = [_dataController
nodeAtIndexPath:
indexPath];
return
node.
calculatedSize
.
height
;
}
- (
NSInteger
)
numberOfSectionsInTableView
:
(UITableView *)
tableView
{
return
[_dataController
numberOfSections
];
}
- (
NSInteger
)
tableView
:
(UITableView *)
tableView
numberOfRowsInSection
:
(
NSInteger
)
section
{
return
[_dataController
numberOfRowsInSection:
section];
}
- (ASScrollDirection)
scrollDirection
{
CGPoint scrollVelocity = [
self
.panGestureRecognizer
velocityInView:
self
.superview];
ASScrollDirection direction = ASScrollDirectionNone;
if
(_layoutController.
layoutDirection
== ASFlowLayoutDirectionHorizontal) {
if
(scrollVelocity.
x
>
0
) {
direction = ASScrollDirectionRight;
}
else
if
(scrollVelocity.
x
<
0
) {
direction = ASScrollDirectionLeft;
}
}
else
{
if
(scrollVelocity.
y
>
0
) {
direction = ASScrollDirectionDown;
}
else
{
direction = ASScrollDirectionUp;
}
}
return
direction;
}
- (
void
)
tableView
:
(UITableView *)
tableView
willDisplayCell
:
(UITableViewCell *)
cell
forRowAtIndexPath
:
(
NSIndexPath
*)
indexPath
{
[_rangeController
visibleNodeIndexPathsDidChangeWithScrollDirection:
self
.scrollDirection];
if
([_asyncDelegate
respondsToSelector:
@selector
(
tableView:willDisplayNodeForRowAtIndexPath:
)]) {
[_asyncDelegate
tableView:
self
willDisplayNodeForRowAtIndexPath:
indexPath];
}
}
- (
void
)
tableView
:
(UITableView *)
tableView
didEndDisplayingCell
:
(UITableViewCell *)
cell
forRowAtIndexPath
:
(
NSIndexPath
*)
indexPath
{
[_rangeController
visibleNodeIndexPathsDidChangeWithScrollDirection:
self
.scrollDirection];
if
([_asyncDelegate
respondsToSelector:
@selector
(
tableView:didEndDisplayingNodeForRowAtIndexPath:
)]) {
[_asyncDelegate
tableView:
self
didEndDisplayingNodeForRowAtIndexPath:
indexPath];
}
}
#
pragma mark
-
#
pragma mark
ASRangeControllerDelegate.
- (
NSArray
*)
rangeControllerVisibleNodeIndexPaths
:
(ASRangeController *)
rangeController
{
ASDisplayNodeAssertMainThread
();
return
[
self
indexPathsForVisibleRows
];
}
- (
NSArray
*)
rangeController
:
(ASRangeController *)
rangeController
nodesAtIndexPaths
:
(
NSArray
*)
indexPaths
{
return
[_dataController
nodesAtIndexPaths:
indexPaths];
}
- (CGSize)
rangeControllerViewportSize
:
(ASRangeController *)
rangeController
{
ASDisplayNodeAssertMainThread
();
return
self.
bounds
.
size
;
}
- (
void
)
rangeController
:
(ASRangeController *)
rangeController
didInsertNodesAtIndexPaths
:
(
NSArray
*)
indexPaths
{
ASDisplayNodeAssertMainThread
();
[UIView
performWithoutAnimation:
^{
[
super
insertRowsAtIndexPaths:
indexPaths
withRowAnimation:
UITableViewRowAnimationNone];
}];
}
- (
void
)
rangeController
:
(ASRangeController *)
rangeController
didDeleteNodesAtIndexPaths
:
(
NSArray
*)
indexPaths
{
ASDisplayNodeAssertMainThread
();
[UIView
performWithoutAnimation:
^{
[
super
deleteRowsAtIndexPaths:
indexPaths
withRowAnimation:
UITableViewRowAnimationNone];
}];
}
- (
void
)
rangeController
:
(ASRangeController *)
rangeController
didInsertSectionsAtIndexSet
:
(
NSIndexSet
*)
indexSet
{
ASDisplayNodeAssertMainThread
();
[UIView
performWithoutAnimation:
^{
[
super
insertSections:
indexSet
withRowAnimation:
UITableViewRowAnimationNone];
}];
}
- (
void
)
rangeController
:
(ASRangeController *)
rangeController
didDeleteSectionsAtIndexSet
:
(
NSIndexSet
*)
indexSet
{
ASDisplayNodeAssertMainThread
();
[UIView
performWithoutAnimation:
^{
[
super
deleteSections:
indexSet
withRowAnimation:
UITableViewRowAnimationNone];
}];
}
#
pragma mark
- ASDataControllerDelegate
- (ASCellNode *)
dataController
:
(ASDataController *)
dataController
nodeAtIndexPath
:
(
NSIndexPath
*)
indexPath
{
ASCellNode *node = [_asyncDataSource
tableView:
self
nodeForRowAtIndexPath:
indexPath];
ASDisplayNodeAssert
([node
isKindOfClass:
ASCellNode.
class
],
@"
invalid node class, expected ASCellNode
"
);
return
node;
}
- (CGSize)
dataController
:
(ASDataController *)
dataController
constrainedSizeForNodeAtIndexPath
:
(
NSIndexPath
*)
indexPath
{
return
CGSizeMake
(self.
bounds
.
size
.
width
,
FLT_MAX
);
}
- (
NSUInteger
)
dataController
:
(ASDataController *)
dataControllre
rowsInSection
:
(
NSUInteger
)
section
{
return
[_asyncDataSource
tableView:
self
numberOfRowsInSection:
section];
}
- (
NSUInteger
)
dataControllerNumberOfSections
:
(ASDataController *)
dataController
{
if
([_asyncDataSource
respondsToSelector:
@selector
(
numberOfSectionsInTableView:
)]) {
return
[_asyncDataSource
numberOfSectionsInTableView:
self
];
}
else
{
return
1
;
//
default section number
}
}
@end
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