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AQGridView.m
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AQGridView.m
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/*
* AQGridView.m
* AQGridView
*
* Created by Jim Dovey on 10/2/2010.
* Copyright 2010 Kobo Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Neither the name of the project's author nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#import "AQGridView.h"
#import "AQGridViewUpdateItem.h"
#import "AQGridViewAnimatorItem.h"
#import "AQGridViewData.h"
#import "AQGridViewUpdateInfo.h"
#import "AQGridViewCell+AQGridViewCellPrivate.h"
#import "AQGridView+CellLocationDelegation.h"
#import "NSIndexSet+AQIsSetContiguous.h"
#import "NSIndexSet+AQIndexesOutsideSet.h"
#import <libkern/OSAtomic.h>
// see _basicHitTest:withEvent: below
#import <objc/objc.h>
#import <objc/runtime.h>
NSString * const AQGridViewSelectionDidChangeNotification = @"AQGridViewSelectionDidChangeNotification";
@interface AQGridView (AQCellGridMath)
- (NSUInteger) visibleCellListIndexForItemIndex: (NSUInteger) itemIndex;
@end
@interface AQGridView (AQCellLayout)
- (void) layoutCellsInVisibleCellRange: (NSRange) range;
- (void) layoutAllCells;
- (CGRect) fixCellFrame: (CGRect) cellFrame forGridRect: (CGRect) gridRect;
- (void) updateVisibleGridCellsNow;
//- (void) updateForwardCellsForVisibleIndices: (NSIndexSet *) newVisibleIndices;
- (AQGridViewCell *) createPreparedCellForIndex: (NSUInteger) index;
- (void) insertVisibleCell: (AQGridViewCell *) cell atIndex: (NSUInteger) visibleCellListIndex;
- (void) deleteVisibleCell: (AQGridViewCell *) cell atIndex: (NSUInteger) visibleCellListIndex appendingNewCell: (AQGridViewCell *) newLastCell;
@end
@interface AQGridView ()
@property (nonatomic, copy) NSIndexSet * animatingIndices;
@end
@implementation AQGridView
@synthesize dataSource=_dataSource, backgroundView=_backgroundView, separatorColor=_separatorColor, animatingCells=_animatingCells, animatingIndices=_animatingIndices;
- (void) _sharedGridViewInit
{
_gridData = [[AQGridViewData alloc] initWithGridView: self];
[_gridData setDesiredCellSize: CGSizeMake(96.0, 128.0)];
_visibleBounds = self.bounds;
_visibleCells = [[NSMutableArray alloc] init];
_reusableGridCells = [[NSMutableDictionary alloc] init];
_highlightedIndices = [[NSMutableIndexSet alloc] init];
_updateInfoStack = [[NSMutableArray alloc] init];
self.clipsToBounds = YES;
self.separatorColor = [UIColor colorWithWhite: 0.85 alpha: 1.0];
self.canCancelContentTouches = YES;
_selectedIndex = NSNotFound;
_pendingSelectionIndex = NSNotFound;
_flags.resizesCellWidths = 0;
_flags.numColumns = [_gridData numberOfItemsPerRow];
_flags.separatorStyle = AQGridViewCellSeparatorStyleEmptySpace;
_flags.allowsSelection = 1;
_flags.usesPagedHorizontalScrolling = NO;
_flags.contentSizeFillsBounds = 1;
}
- (id)initWithFrame: (CGRect) frame
{
self = [super initWithFrame:frame];
if ( self == nil )
return ( nil );
[self _sharedGridViewInit];
return ( self );
}
- (id) initWithCoder: (NSCoder *) aDecoder
{
self = [super initWithCoder: aDecoder];
if ( self == nil )
return ( nil );
[self _sharedGridViewInit];
return ( self );
}
/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
// Drawing code
}
*/
- (void)dealloc
{
[_visibleCells release];
[_reusableGridCells release];
[_highlightedIndices release];
[_backgroundView release];
[_separatorColor release];
[_gridData release];
[_updateInfoStack release];
[_animatingCells release];
[_headerView release];
[_footerView release];
[super dealloc];
}
#pragma mark -
#pragma mark Properties
- (void) setDelegate: (id<AQGridViewDelegate>) obj
{
if ( (obj != nil) && ([obj conformsToProtocol: @protocol(AQGridViewDelegate)] == NO ))
[NSException raise: NSInvalidArgumentException format: @"Argument to -setDelegate must conform to the AQGridViewDelegate protocol"];
[super setDelegate: obj];
_flags.delegateWillDisplayCell = [obj respondsToSelector: @selector(gridView:willDisplayCell:forItemAtIndex:)];
_flags.delegateWillSelectItem = [obj respondsToSelector: @selector(gridView:willSelectItemAtIndex:)];
_flags.delegateWillDeselectItem = [obj respondsToSelector: @selector(gridView:willDeselectItemAtIndex:)];
_flags.delegateDidSelectItem = [obj respondsToSelector: @selector(gridView:didSelectItemAtIndex:)];
_flags.delegateDidDeselectItem = [obj respondsToSelector: @selector(gridView:didDeselectItemAtIndex:)];
_flags.delegateGestureRecognizerActivated = [obj respondsToSelector: @selector(gridView:gestureRecognizer:activatedForItemAtIndex:)];
_flags.delegateAdjustGridCellFrame = [obj respondsToSelector: @selector(gridView:adjustCellFrame:withinGridCellFrame:)];
}
- (id<AQGridViewDelegate>) delegate
{
id obj = [super delegate];
if ( [obj conformsToProtocol: @protocol(AQGridViewDelegate)] == NO )
return ( nil );
return ( obj );
}
- (void) setDataSource: (id<AQGridViewDataSource>) obj
{
if ((obj != nil) && ([obj conformsToProtocol: @protocol(AQGridViewDataSource)] == NO ))
[NSException raise: NSInvalidArgumentException format: @"Argument to -setDataSource must conform to the AQGridViewDataSource protocol"];
_dataSource = obj;
_flags.dataSourceGridCellSize = [obj respondsToSelector: @selector(portraitGridCellSizeForGridView:)];
}
- (AQGridViewLayoutDirection) layoutDirection
{
return ( _gridData.layoutDirection );
}
- (void) setLayoutDirection: (AQGridViewLayoutDirection) direction
{
_gridData.layoutDirection = direction;
}
- (NSUInteger) numberOfItems
{
return ( _gridData.numberOfItems );
}
- (NSUInteger) numberOfColumns
{
if ( _flags.numColumns == 0 )
_flags.numColumns = 1;
return ( _flags.numColumns );
}
- (NSUInteger) numberOfRows
{
return ( _gridData.numberOfItems / _flags.numColumns );
}
- (BOOL) allowsSelection
{
return ( _flags.allowsSelection );
}
- (void) setAllowsSelection: (BOOL) value
{
_flags.allowsSelection = (value ? 1 : 0);
}
- (BOOL) backgroundViewExtendsDown
{
return ( _flags.backgroundViewExtendsDown);
}
- (void) setBackgroundViewExtendsDown: (BOOL) value
{
_flags.backgroundViewExtendsDown = (value ? 1 : 0);
}
- (BOOL) backgroundViewExtendsUp
{
return ( _flags.backgroundViewExtendsUp);
}
- (void) setBackgroundViewExtendsUp: (BOOL) value
{
_flags.backgroundViewExtendsUp = (value ? 1 : 0);
}
- (BOOL) requiresSelection
{
return ( _flags.requiresSelection );
}
- (void) setRequiresSelection: (BOOL) value
{
_flags.requiresSelection = (value ? 1 : 0);
}
- (BOOL) resizesCellWidthToFit
{
return ( _flags.resizesCellWidths );
}
- (void) setResizesCellWidthToFit: (BOOL) value
{
int i = (value ? 1 : 0);
if ( _flags.resizesCellWidths == i )
return;
_flags.resizesCellWidths = i;
[self setNeedsLayout];
}
- (BOOL) clipsContentWidthToBounds
{
return ( self.layoutDirection == AQGridViewLayoutDirectionVertical );
}
- (void) setClipsContentWidthToBounds: (BOOL) value
{
self.layoutDirection = (value ? AQGridViewLayoutDirectionVertical : AQGridViewLayoutDirectionHorizontal);
}
- (BOOL) usesPagedHorizontalScrolling
{
return ( _flags.usesPagedHorizontalScrolling );
}
- (void) setUsesPagedHorizontalScrolling: (BOOL) value
{
int i = (value ? 1 : 0);
if ( _flags.usesPagedHorizontalScrolling == i )
return;
_flags.usesPagedHorizontalScrolling = i;
[self setNeedsLayout];
}
- (AQGridViewCellSeparatorStyle) separatorStyle
{
return ( _flags.separatorStyle );
}
- (void) setSeparatorStyle: (AQGridViewCellSeparatorStyle) style
{
if ( style == _flags.separatorStyle )
return;
_flags.separatorStyle = style;
for ( AQGridViewCell * cell in _visibleCells )
{
cell.separatorStyle = style;
}
[self setNeedsLayout];
}
- (CGFloat) leftContentInset
{
return ( _gridData.leftPadding );
}
- (void) setLeftContentInset: (CGFloat) inset
{
_gridData.leftPadding = inset;
}
- (CGFloat) rightContentInset
{
return ( _gridData.rightPadding );
}
- (void) setRightContentInset: (CGFloat) inset
{
_gridData.rightPadding = inset;
}
- (CGSize) gridCellSize
{
return ( [_gridData cellSize] );
}
- (UIView *) gridHeaderView
{
return ( [[_headerView retain] autorelease] );
}
- (void) setGridHeaderView: (UIView *) newHeaderView
{
if ( newHeaderView == _headerView )
return;
[_headerView removeFromSuperview];
[_headerView release];
_headerView = [newHeaderView retain];
if ( _headerView == nil )
{
_gridData.topPadding = 0.0;
}
else
{
[self addSubview: _headerView];
_gridData.topPadding = _headerView.frame.size.height;
}
[self setNeedsLayout];
}
- (UIView *) gridFooterView
{
return ( [[_footerView retain] autorelease] );
}
- (void) setGridFooterView: (UIView *) newFooterView
{
if ( newFooterView == _footerView )
return;
[_footerView removeFromSuperview];
[_footerView release];
_footerView = [newFooterView retain];
if ( _footerView == nil )
{
_gridData.bottomPadding = 0.0;
}
else
{
[self addSubview: _footerView];
_gridData.bottomPadding = _footerView.frame.size.height;
}
[self setNeedsLayout];
}
- (BOOL) contentSizeGrowsToFillBounds
{
return ( _flags.contentSizeFillsBounds == 1 );
}
- (void) setContentSizeGrowsToFillBounds: (BOOL) value
{
_flags.contentSizeFillsBounds = (value ? 1 : 0);
}
- (void) setAnimatingCells: (NSSet *) set
{
[set retain];
[_animatingCells release];
_animatingCells = set;
NSMutableIndexSet * indices = [[NSMutableIndexSet alloc] init];
for ( AQGridViewAnimatorItem * item in set )
{
if ( item.index != NSNotFound )
[indices addIndex: item.index];
}
self.animatingIndices = indices;
[indices release];
}
- (BOOL) isAnimatingUpdates
{
return ( _animationCount > 0 );
}
- (void) updateContentRectWithOldMaxLocation: (CGPoint) oldMaxLocation gridSize: (CGSize) gridSize
{
// The following line prevents an update leading to unneccessary auto-scrolling
// Before this fix, AQGridView animation always caused scrolling to the most bottom line
if (CGSizeEqualToSize(self.contentSize, gridSize)) return;
// update content size
self.contentSize = gridSize;
// fix content offset if applicable
CGPoint offset = self.contentOffset;
CGPoint oldOffset = offset;
if ( offset.y + self.bounds.size.height > gridSize.height )
{
offset.y = MAX(0.0, self.contentSize.height - self.bounds.size.height);
}
else if ( !CGPointEqualToPoint(oldOffset, CGPointZero) ) // stick-to-top takes precedence
{
if ( [_gridData pointIsInLastRow: oldMaxLocation] )
{
// we were scrolled to the bottom-- stay there as our height decreases
if ( self.layoutDirection == AQGridViewLayoutDirectionVertical )
offset.y = MAX(0.0, self.contentSize.height - self.bounds.size.height);
else
offset.x = MAX(0.0, self.contentSize.width - self.bounds.size.width);
}
}
//NSLog( @"Resetting offset from %@ to %@", NSStringFromCGPoint(oldOffset), NSStringFromCGPoint(offset) );
self.contentOffset = offset;
}
- (void) handleGridViewBoundsChanged: (CGRect) oldBounds toNewBounds: (CGRect) bounds
{
CGSize oldGridSize = [_gridData sizeForEntireGrid];
BOOL wasAtBottom = ((oldGridSize.height != 0.0) && (CGRectGetMaxY(oldBounds) == oldGridSize.height));
[_gridData gridViewDidChangeBoundsSize: bounds.size];
_flags.numColumns = [_gridData numberOfItemsPerRow];
CGSize newGridSize = [_gridData sizeForEntireGrid];
CGPoint oldMaxLocation = CGPointMake(CGRectGetMaxX(oldBounds), CGRectGetMaxY(oldBounds));
[self updateContentRectWithOldMaxLocation: oldMaxLocation gridSize: newGridSize];
if ( (wasAtBottom) && (!CGPointEqualToPoint(oldBounds.origin, CGPointZero)) && (newGridSize.height > oldGridSize.height) )
{
CGRect contentRect = self.bounds;
if ( CGRectGetMaxY(contentRect) < newGridSize.height )
{
contentRect.origin.y += (newGridSize.height - oldGridSize.height);
self.contentOffset = contentRect.origin;
}
}
[self updateVisibleGridCellsNow];
_flags.allCellsNeedLayout = 1;
}
- (void) setContentOffset:(CGPoint) offset
{
[super setContentOffset: offset];
}
- (void)setContentOffset: (CGPoint) contentOffset animated: (BOOL) animate
{
// Call our super duper method
[super setContentOffset: contentOffset animated: animate];
// for long grids, ensure there are visible cells when scrolled to
if (!animate)
{
[self updateVisibleGridCellsNow];
/*if (![_visibleCells count])
{
NSIndexSet * newIndices = [_gridData indicesOfCellsInRect: [self gridViewVisibleBounds]];
[self updateForwardCellsForVisibleIndices: newIndices];
}*/
}
}
- (void) setContentSize: (CGSize) newSize
{
if ( (_flags.contentSizeFillsBounds == 1) && (newSize.height < self.bounds.size.height) )
newSize.height = self.bounds.size.height;
if (self.gridFooterView)
{
// In-call status bar influences footer position
CGFloat statusHeight = CGRectGetHeight([UIApplication sharedApplication].statusBarFrame) - 20;
CGFloat footerHeight = CGRectGetHeight(self.gridFooterView.bounds);
CGFloat minimumHeight = statusHeight + CGRectGetHeight(self.bounds) + footerHeight;
if (newSize.height < footerHeight + minimumHeight)
newSize.height = minimumHeight;
}
CGSize oldSize = self.contentSize;
[super setContentSize: newSize];
if ( oldSize.width != newSize.width )
[_gridData gridViewDidChangeBoundsSize: newSize];
if ( CGRectGetMaxY(self.bounds) > newSize.height )
{
CGRect b = self.bounds;
CGFloat diff = CGRectGetMaxY(b) - newSize.height;
b.origin.y = MAX(0.0, b.origin.y - diff);
self.bounds = b;
}
}
- (void) setFrame: (CGRect) newFrame
{
CGRect oldBounds = self.bounds;
[super setFrame: newFrame];
CGRect newBounds = self.bounds;
if ( newBounds.size.width != oldBounds.size.width )
[self handleGridViewBoundsChanged: oldBounds toNewBounds: newBounds];
}
- (void) setBounds: (CGRect) bounds
{
CGRect oldBounds = self.bounds;
[super setBounds: bounds];
bounds = self.bounds; // in case it was modified
if ( !CGSizeEqualToSize(bounds.size, oldBounds.size) )
[self handleGridViewBoundsChanged: oldBounds toNewBounds: bounds];
}
- (BOOL) isEditing
{
return ( _flags.isEditing == 1 );
}
- (void) setEditing: (BOOL) value
{
[self setEditing:value animated:NO];
}
#pragma mark -
#pragma mark Data Management
- (AQGridViewCell *) dequeueReusableCellWithIdentifier: (NSString *) reuseIdentifier
{
NSMutableSet * cells = [_reusableGridCells objectForKey: reuseIdentifier];
AQGridViewCell * cell = [[cells anyObject] retain];
if ( cell == nil )
return ( nil );
[cell prepareForReuse];
[cells removeObject: cell];
return ( [cell autorelease] );
}
- (void) enqueueReusableCells: (NSArray *) reusableCells
{
for ( AQGridViewCell * cell in reusableCells )
{
NSMutableSet * reuseSet = [_reusableGridCells objectForKey: cell.reuseIdentifier];
if ( reuseSet == nil )
{
reuseSet = [[NSMutableSet alloc] initWithCapacity: 32];
[_reusableGridCells setObject: reuseSet forKey: cell.reuseIdentifier];
[reuseSet release];
}
else if ( [reuseSet member: cell] == cell )
{
NSLog( @"Warning: tried to add duplicate gridview cell" );
continue;
}
[reuseSet addObject: cell];
}
}
- (CGRect) gridViewVisibleBounds
{
CGRect result = CGRectZero;
result.origin = self.contentOffset;
result.size = self.bounds.size;
return ( result );
}
- (void) reloadData
{
if ( _reloadingSuspendedCount != 0 )
return;
if ( _flags.dataSourceGridCellSize == 1 )
{
[_gridData setDesiredCellSize: [_dataSource portraitGridCellSizeForGridView: self]];
_flags.numColumns = [_gridData numberOfItemsPerRow];
}
_gridData.numberOfItems = [_dataSource numberOfItemsInGridView: self];
// update our content size as appropriate
self.contentSize = [_gridData sizeForEntireGrid];
// fix up the visible index list
NSUInteger cutoff = MAX(0, _gridData.numberOfItems-_visibleIndices.length);
_visibleIndices.location = MIN(_visibleIndices.location, cutoff);
_visibleIndices.length = 0;
// remove all existing cells
[_visibleCells makeObjectsPerformSelector: @selector(removeFromSuperview)];
[self enqueueReusableCells: _visibleCells];
[_visibleCells removeAllObjects];
// -layoutSubviews will update the visible cell list
// layout -- no animation
[self setNeedsLayout];
_flags.allCellsNeedLayout = 1;
}
#define MAX_BOUNCE_DISTANCE (500.0f)
- (void) layoutSubviews
{
if ( (_flags.needsReload == 1) && (_animationCount == 0) && (_reloadingSuspendedCount == 0) )
[self reloadData];
if ( (_reloadingSuspendedCount == 0) && (!CGRectIsEmpty([self gridViewVisibleBounds])) )
{
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
[self updateVisibleGridCellsNow];
[pool release];
}
if ( _flags.allCellsNeedLayout == 1 )
{
_flags.allCellsNeedLayout = 0;
if ( _visibleIndices.length != 0 )
[self layoutAllCells];
}
CGRect rect = CGRectZero;
rect.size.width = self.bounds.size.width;
rect.size.height = self.contentSize.height - (_gridData.topPadding + _gridData.bottomPadding);
rect.origin.y += _gridData.topPadding;
// Make sure background is an integral number of rows tall. That way, it draws patterned colours correctly on all OSes.
CGRect backgroundRect = rect;
if ([self backgroundViewExtendsUp]) {
backgroundRect.origin.y = backgroundRect.origin.y - MAX_BOUNCE_DISTANCE;
backgroundRect.size.height += MAX_BOUNCE_DISTANCE; // don't just move it, grow it
}
if ([self backgroundViewExtendsDown]) {
backgroundRect.size.height = backgroundRect.size.height + MAX_BOUNCE_DISTANCE;
}
CGFloat minimumHeight = rect.size.height;
CGFloat actualHeight = [_gridData cellSize].height * ([_gridData numberOfItems] / [_gridData numberOfItemsPerRow] + 1);
for (; actualHeight < minimumHeight; actualHeight += [_gridData cellSize].height) {
}
backgroundRect.size.height = actualHeight;
self.backgroundView.frame = backgroundRect;
if ( _headerView != nil )
{
rect = _headerView.frame;
rect.origin = CGPointZero;
rect.size.width = self.bounds.size.width;
_headerView.frame = rect;
}
if ( _footerView != nil )
{
rect = _footerView.frame;
rect.origin.x = 0.0;
rect.origin.y = self.contentSize.height - rect.size.height;
rect.size.width = self.bounds.size.width;
_footerView.frame = rect;
[self bringSubviewToFront:_footerView];
}
}
- (CGRect) rectForItemAtIndex: (NSUInteger) index
{
// simple case -- there's a cell already, we can just ask for its frame
if ( NSLocationInRange(index, _visibleIndices) )
return ( [[_visibleCells objectAtIndex: [self visibleCellListIndexForItemIndex: index]] frame] );
// complex case-- compute the frame manually
return ( [self fixCellFrame: CGRectZero forGridRect: [_gridData cellRectAtIndex: index]] );
}
- (AQGridViewCell *) cellForItemAtIndex: (NSUInteger) index
{
//if ( NSLocationInRange(index, _visibleIndices) == NO )
// return ( nil );
// we don't clip to visible range-- when animating edits the visible cell list can contain extra items
NSUInteger visibleCellListIndex = [self visibleCellListIndexForItemIndex: index];
if ( visibleCellListIndex < [_visibleCells count] )
return ( [_visibleCells objectAtIndex: visibleCellListIndex] );
return ( nil );
}
- (NSUInteger) indexForItemAtPoint: (CGPoint) point
{
return ( [_gridData itemIndexForPoint: point] );
}
- (NSUInteger) indexForCell: (AQGridViewCell *) cell
{
NSUInteger index = [_visibleCells indexOfObject:cell];
if (index == NSNotFound)
return NSNotFound;
return _visibleIndices.location + index;
}
- (AQGridViewCell *) cellForItemAtPoint: (CGPoint) point
{
return ( [self cellForItemAtIndex: [_gridData itemIndexForPoint: point]] );
}
- (NSArray *) visibleCells
{
return ( [[_visibleCells copy] autorelease] );
}
- (NSIndexSet *) visibleCellIndices
{
return ( [NSIndexSet indexSetWithIndexesInRange: _visibleIndices] );
}
- (void) scrollToItemAtIndex: (NSUInteger) index atScrollPosition: (AQGridViewScrollPosition) scrollPosition
animated: (BOOL) animated
{
CGRect gridRect = [_gridData cellRectAtIndex: index];
CGRect targetRect = self.bounds;
switch ( scrollPosition )
{
case AQGridViewScrollPositionNone:
default:
targetRect = gridRect; // no special coordinate handling
break;
case AQGridViewScrollPositionTop:
targetRect.origin.y = gridRect.origin.y; // set target y origin to cell's y origin
break;
case AQGridViewScrollPositionMiddle:
targetRect.origin.y = MAX(gridRect.origin.y - (CGFloat)ceilf((targetRect.size.height - gridRect.size.height) * 0.5), 0.0);
break;
case AQGridViewScrollPositionBottom:
targetRect.origin.y = MAX((CGFloat)floorf(gridRect.origin.y - (targetRect.size.height - gridRect.size.height)), 0.0);
break;
}
[self scrollRectToVisible: targetRect animated: animated];
// for long grids, ensure there are visible cells when scrolled to
if (!animated) {
[self updateVisibleGridCellsNow];
/*if (![_visibleCells count]) {
NSIndexSet * newIndices = [_gridData indicesOfCellsInRect: [self gridViewVisibleBounds]];
[self updateForwardCellsForVisibleIndices: newIndices];
}*/
}
}
#pragma mark -
#pragma mark Cell Updates
- (BOOL) isRectVisible: (CGRect) frameRect
{
return ( CGRectIntersectsRect(frameRect, self.bounds) );
}
- (void) fixCellsFromAnimation
{
// the visible cell list might contain hidden cells-- make them visible now
for ( AQGridViewCell * cell in _visibleCells )
{
if ( cell.hiddenForAnimation )
{
cell.hiddenForAnimation = NO;
if ( _flags.delegateWillDisplayCell == 1 )
[self delegateWillDisplayCell: cell atIndex: cell.displayIndex];
cell.hidden = NO;
}
}
// update the visible item list appropriately
NSIndexSet * indices = [_gridData indicesOfCellsInRect: self.bounds];
if ( [indices count] == 0 )
{
_visibleIndices.location = 0;
_visibleIndices.length = 0;
[_visibleCells makeObjectsPerformSelector: @selector(removeFromSuperview)];
[self enqueueReusableCells: _visibleCells];
[_visibleCells removeAllObjects];
// update the content size/offset based on the new grid data
CGPoint oldMaxLocation = CGPointMake(CGRectGetMaxX(self.bounds), CGRectGetMaxY(self.bounds));
[self updateContentRectWithOldMaxLocation: oldMaxLocation gridSize: [_gridData sizeForEntireGrid]];
return;
}
_visibleIndices.location = [indices firstIndex];
_visibleIndices.length = [indices count];
NSMutableArray * newVisibleCells = [[NSMutableArray alloc] initWithCapacity: _visibleIndices.length];
for ( AQGridViewAnimatorItem * item in self.animatingCells )
{
if ( [item.animatingView isKindOfClass: [AQGridViewCell class]] == NO )
{
[item.animatingView removeFromSuperview];
continue;
}
if ( [self isRectVisible: [_gridData cellRectForPoint: item.animatingView.center]] == NO )
{
[item.animatingView removeFromSuperview];
continue;
}
[newVisibleCells addObject: item.animatingView];
}
//NSAssert([newVisibleCells count] == _visibleIndices.length, @"visible cell count after animation doesn't match visible indices");
[newVisibleCells sortUsingSelector: @selector(compareOriginAgainstCell:)];
[_visibleCells removeObjectsInArray: newVisibleCells];
[_visibleCells makeObjectsPerformSelector: @selector(removeFromSuperview)];
[_visibleCells setArray: newVisibleCells];
[newVisibleCells release];
self.animatingCells = nil;
NSMutableSet * removals = [[NSMutableSet alloc] init];
for ( UIView * view in self.subviews )
{
if ( [view isKindOfClass: [AQGridViewCell class]] == NO )
continue;
if ( [_visibleCells containsObject: view] == NO )
[removals addObject: view];
}
[removals makeObjectsPerformSelector: @selector(removeFromSuperview)];
[removals release];
// update the content size/offset based on the new grid data
CGPoint oldMaxLocation = CGPointMake(CGRectGetMaxX(self.bounds), CGRectGetMaxY(self.bounds));
[self updateContentRectWithOldMaxLocation: oldMaxLocation gridSize: [_gridData sizeForEntireGrid]];
}
- (void) setupUpdateAnimations
{
_reloadingSuspendedCount++;
AQGridViewUpdateInfo * info = [[AQGridViewUpdateInfo alloc] initWithOldGridData: _gridData forGridView: self];
[_updateInfoStack addObject: info];
[info release];
}
- (void) endUpdateAnimations
{
NSAssert([_updateInfoStack lastObject] != nil, @"_updateInfoStack should not be empty at this point" );
AQGridViewUpdateInfo * info = [_updateInfoStack lastObject];
if ( info.numberOfUpdates == 0 )
{
[_updateInfoStack removeObject: info];
_reloadingSuspendedCount--;
return;
}
NSUInteger expectedItemCount = [info numberOfItemsAfterUpdates];
NSUInteger actualItemCount = [_dataSource numberOfItemsInGridView: self];
if ( expectedItemCount != actualItemCount )
{
NSUInteger numAdded = [[info sortedInsertItems] count];
NSUInteger numDeleted = [[info sortedDeleteItems] count];
[_updateInfoStack removeObject: info];
_reloadingSuspendedCount--;
[NSException raise: NSInternalInconsistencyException format: @"Invalid number of items in AQGridView: Started with %u, added %u, deleted %u. Expected %u items after changes, but got %u", (unsigned)_gridData.numberOfItems, (unsigned)numAdded, (unsigned)numDeleted, (unsigned)expectedItemCount, (unsigned)actualItemCount];
}
// there's a race condition with the info's removal from the stack if there are no animations taking place,
// where -cellUpdateAnimationStopped:finished:context: is called immediately, before we've finished with the
// object. Therefore we retain it while we want to use it, just in case
[info retain];
[info cleanupUpdateItems];
_animationCount++;
//NSAssert(_animationCount == 1, @"Stacked animations occurring!!");
[UIView beginAnimations: @"CellUpdates" context: info];
[UIView setAnimationDelegate: self];
[UIView setAnimationDidStopSelector: @selector(cellUpdateAnimationStopped:finished:context:)];
[UIView setAnimationCurve: UIViewAnimationCurveEaseInOut];
[UIView setAnimationDuration: 0.3];
self.animatingCells = [info animateCellUpdatesUsingVisibleContentRect: [self gridViewVisibleBounds]];
[_gridData release];
_gridData = [[info newGridViewData] retain];
if ( _selectedIndex != NSNotFound )
_selectedIndex = [info newIndexForOldIndex: _selectedIndex];
[info release];
_reloadingSuspendedCount--;
[UIView commitAnimations];
}
- (void) cellUpdateAnimationStopped: (NSString *) animationID finished: (BOOL) finished context: (void *) context
{
AQGridViewUpdateInfo * info = (AQGridViewUpdateInfo *)context;
// if nothing was animated, we don't have to do anything at all
// if ( self.animatingCells.count != 0 )
[self fixCellsFromAnimation];
// NB: info becomes invalid at this point
[_updateInfoStack removeObject: info];
_animationCount--;
//_reloadingSuspendedCount--;
}
- (void) beginUpdates
{
if ( _updateCount++ == 0 )
[self setupUpdateAnimations];
}
- (void) endUpdates
{
if ( --_updateCount == 0 )
[self endUpdateAnimations];
}
- (void) _updateItemsAtIndices: (NSIndexSet *) indices updateAction: (AQGridViewUpdateAction) action withAnimation: (AQGridViewItemAnimation) animation
{
BOOL needsAnimationSetup = ([_updateInfoStack count] <= _animationCount);
// not in the middle of an update loop -- start animations here
if ( needsAnimationSetup )
[self setupUpdateAnimations];
[[_updateInfoStack lastObject] updateItemsAtIndices: indices updateAction: action withAnimation: animation];
// not in the middle of an update loop -- commit animations here
if ( needsAnimationSetup )
[self endUpdateAnimations];
}
- (void) insertItemsAtIndices: (NSIndexSet *) indices withAnimation: (AQGridViewItemAnimation) animation
{
[self _updateItemsAtIndices: indices updateAction: AQGridViewUpdateActionInsert withAnimation: animation];
}
- (void) deleteItemsAtIndices: (NSIndexSet *) indices withAnimation: (AQGridViewItemAnimation) animation
{
[self _updateItemsAtIndices: indices updateAction: AQGridViewUpdateActionDelete withAnimation: animation];