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Integrate new layout nodes to the framework.

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- Introduce ASLayoutNode and its subclasses.
- ASDisplayNode measures its ASLayoutNode and cache the result (ASLayout). Calculated size and position of each subnode can be retrieved from the calculated layout.
- Custom nodes need to override -layoutNodeThatFits:(CGSize) instead of -calculateSizeThatFits:(CGSize).
- Custom nodes do not need to layout its subnodes (in -layout:) anymore. ASDisplayNode can handle the job most of the time, by walking through its layout tree.
- ASCompositeNode is used to embed (display) subnodes to a node's layout. That way, each subnode will also be measured while the parent node is measuring. And the parent node knows where its subnodes are within its layout.
This commit is contained in:
Huy Nguyen
2015-05-28 20:36:55 +03:00
parent f8531f467d
commit abe98d5b09
13 changed files with 315 additions and 119 deletions
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15
AsyncDisplayKit/ASTextNode.mm
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@@ -19,6 +19,8 @@
#import "ASTextNodeRenderer.h"
#import "ASTextNodeShadower.h"
#import "ASLayoutNode.h"
static const NSTimeInterval ASTextNodeHighlightFadeOutDuration = 0.15;
static const NSTimeInterval ASTextNodeHighlightFadeInDuration = 0.1;
static const CGFloat ASTextNodeHighlightLightOpacity = 0.11;
@@ -184,7 +186,7 @@ ASDISPLAYNODE_INLINE CGFloat ceilPixelValue(CGFloat f)
#pragma mark - ASDisplayNode
- (CGSize)calculateSizeThatFits:(CGSize)constrainedSize
- (ASLayout *)calculateLayoutThatFits:(CGSize)constrainedSize
{
ASDisplayNodeAssert(constrainedSize.width >= 0, @"Constrained width for text (%f) is too narrow", constrainedSize.width);
ASDisplayNodeAssert(constrainedSize.height >= 0, @"Constrained height for text (%f) is too short", constrainedSize.height);
@@ -210,8 +212,9 @@ ASDISPLAYNODE_INLINE CGFloat ceilPixelValue(CGFloat f)
ASDisplayNodeAssert(renderSizePlusShadowPadding.width >= 0, @"Calculated width for text with shadow padding (%f) is too narrow", constrainedSizeForText.width);
ASDisplayNodeAssert(renderSizePlusShadowPadding.height >= 0, @"Calculated height for text with shadow padding (%f) is too short", constrainedSizeForText.height);
return CGSizeMake(MIN(ceilPixelValue(renderSizePlusShadowPadding.width), constrainedSize.width),
MIN(ceilPixelValue(renderSizePlusShadowPadding.height), constrainedSize.height));
CGSize finalSize = CGSizeMake(MIN(ceilPixelValue(renderSizePlusShadowPadding.width), constrainedSize.width),
MIN(ceilPixelValue(renderSizePlusShadowPadding.height), constrainedSize.height));
return [ASLayout newWithNode:[ASLayoutNode new] size:finalSize];
}
- (void)displayDidFinish
@@ -337,8 +340,8 @@ ASDISPLAYNODE_INLINE CGFloat ceilPixelValue(CGFloat f)
// We need an entirely new renderer
[self _invalidateRenderer];
// Tell the display node superclasses that the cached sizes are incorrect now
[self invalidateCalculatedSize];
// Tell the display node superclasses that the cached layout is incorrect now
[self invalidateCalculatedLayout];
[self setNeedsDisplay];
@@ -359,7 +362,7 @@ ASDISPLAYNODE_INLINE CGFloat ceilPixelValue(CGFloat f)
if ((_exclusionPaths == nil && exclusionPaths != nil) || (![_exclusionPaths isEqualToArray:exclusionPaths])) {
_exclusionPaths = exclusionPaths;
[self _invalidateRenderer];
[self invalidateCalculatedSize];
[self invalidateCalculatedLayout];
[self setNeedsDisplay];
}
}