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//
// DTGridView.m
// GridViewTester
//
// Created by Daniel Tull on 05.12.2008.
// Copyright 2008 Daniel Tull. All rights reserved.
//

#import "DTGridView.h"
#import "DTGridViewCellInfoProtocol.h"

NSInteger const DTGridViewInvalid = -1;


@interface DTGridViewCellInfo : NSObject <DTGridViewCellInfoProtocol> {
NSInteger xPosition, yPosition;
CGRect frame;
CGFloat x, y, width, height;
}
@property (nonatomic, assign) CGFloat x, y, width, height;
@end

@implementation DTGridViewCellInfo
@synthesize xPosition, yPosition, x, y, width, height, frame;
- (NSString *)description {
return [NSString stringWithFormat:@"DTGridViewCellInfo: frame=(%i %i; %i %i) x=%i, y=%i", (NSInteger)self.frame.origin.x, (NSInteger)self.frame.origin.y, (NSInteger)self.frame.size.width, (NSInteger)self.frame.size.height, self.xPosition, self.yPosition];
}
@end

@interface DTGridView ()
- (void)dctInternal_setupInternals;
- (void)loadData;
- (void)checkViews;
- (void)initialiseViews;
- (void)fireEdgeScroll;
- (void)checkNewRowStartingWithCellInfo:(NSObject<DTGridViewCellInfoProtocol> *)info goingUp:(BOOL)goingUp;
- (NSObject<DTGridViewCellInfoProtocol> *)cellInfoForRow:(NSInteger)row column:(NSInteger)col;
- (void)checkRow:(NSInteger)row column:(NSInteger)col goingLeft:(BOOL)goingLeft;


- (void)decelerationTimer:(NSTimer *)timer;
- (void)draggingTimer:(NSTimer *)timer;

@property (nonatomic, retain) NSTimer *decelerationTimer, *draggingTimer;
@end

@implementation DTGridView

@dynamic delegate;
@synthesize dataSource, gridCells, numberOfRows, cellOffset, outset;
@synthesize decelerationTimer, draggingTimer;

- (void)dealloc {
super.delegate = nil;
self.dataSource = nil;
[cellsOnScreen release], cellsOnScreen = nil;
[gridRows release], gridRows = nil;
[rowPositions release], rowPositions = nil;
[rowHeights release], rowHeights = nil;
[freeCells release], freeCells = nil;
[cellInfoForCellsOnScreen release], cellInfoForCellsOnScreen = nil;
    [super dealloc];
}

- (void)setGridDelegate:(id <DTGridViewDelegate>)aDelegate {
self.delegate = aDelegate;
}
- (id <DTGridViewDelegate>)gridDelegate {
return self.delegate;
}

NSInteger intSort(id info1, id info2, void *context) {

DTGridViewCellInfo *i1 = (DTGridViewCellInfo *)info1;
DTGridViewCellInfo *i2 = (DTGridViewCellInfo *)info2;

    if (i1.yPosition < i2.yPosition)
        return NSOrderedAscending;
    else if (i1.yPosition > i2.yPosition)
        return NSOrderedDescending;
    else if (i1.xPosition < i2.xPosition)
return NSOrderedAscending;
else if (i1.xPosition > i2.xPosition)
        return NSOrderedDescending;
else
return NSOrderedSame;
}


- (id)initWithFrame:(CGRect)frame {

if (!(self = [super initWithFrame:frame])) return nil;

[self dctInternal_setupInternals];

return self;

}

- (void)awakeFromNib {
[self dctInternal_setupInternals];
}

- (void)dctInternal_setupInternals {
numberOfRows = DTGridViewInvalid;
columnIndexOfSelectedCell = DTGridViewInvalid;
rowIndexOfSelectedCell = DTGridViewInvalid;

gridRows = [[NSMutableArray alloc] init];
rowPositions = [[NSMutableArray alloc] init];
rowHeights = [[NSMutableArray alloc] init];
cellsOnScreen = [[NSMutableArray alloc] init];

freeCells = [[NSMutableArray alloc] init];

cellInfoForCellsOnScreen = [[NSMutableArray alloc] init];
}

- (void)setFrame:(CGRect)aFrame {

CGSize oldSize = self.frame.size;
CGSize newSize = aFrame.size;

if (oldSize.height != newSize.height || oldSize.width != newSize.width) {
hasResized = YES;
}

[super setFrame:aFrame];

if (hasResized) {
[self setNeedsLayout];
}
}

- (void)reloadData {
[self loadData];
[self setNeedsDisplay];
[self setNeedsLayout];
}

- (void)drawRect:(CGRect)rect {

oldContentOffset = CGPointMake(0.0, 0.0);

//hasLoadedData = NO;

//if (!hasLoadedData)

[self loadData];

for (UIView *v in self.subviews)
[v removeFromSuperview];

[self initialiseViews];

[self didLoad];
}

- (void)didLoad {
if ([self.delegate respondsToSelector:@selector(gridViewDidLoad:)])
[self.delegate gridViewDidLoad:self];
}

- (void)didEndDragging {}
- (void)didEndDecelerating {}
- (void)didEndMoving {}

- (void)layoutSubviews {
[super layoutSubviews];
[self checkViews];
[self fireEdgeScroll];

if (!self.draggingTimer && !self.decelerationTimer && self.dragging)
self.draggingTimer = [NSTimer scheduledTimerWithTimeInterval:0.0 target:self selector:@selector(draggingTimer:) userInfo:nil repeats:NO];

if (!self.decelerationTimer && self.decelerating) {
self.decelerationTimer = [NSTimer scheduledTimerWithTimeInterval:0.0 target:self selector:@selector(decelerationTimer:) userInfo:nil repeats:NO];
[self.draggingTimer invalidate];
self.draggingTimer = nil;
}
}

- (void)decelerationTimer:(NSTimer *)timer {
self.decelerationTimer = nil;
[self didEndDecelerating];
[self didEndMoving];
}

- (void)draggingTimer:(NSTimer *)timer {
self.draggingTimer = nil;
[self didEndDragging];
[self didEndMoving];
}

#pragma mark Adding and Removing Cells

- (void)addCellWithInfo:(NSObject<DTGridViewCellInfoProtocol> *)info {

if (![info isMemberOfClass:[DTGridViewCellInfo class]]) return;

[cellInfoForCellsOnScreen addObject:info];

[cellInfoForCellsOnScreen sortUsingFunction:intSort context:NULL];

DTGridViewCell *cell = [[self findViewForRow:info.yPosition column:info.xPosition] retain];
[cell setNeedsDisplay];
cell.xPosition = info.xPosition;
cell.yPosition = info.yPosition;
cell.delegate = self;
cell.frame = info.frame;

if (cell.xPosition == columnIndexOfSelectedCell && cell.yPosition == rowIndexOfSelectedCell)
cell.selected = YES;
else
cell.selected = NO;

[[gridCells objectAtIndex:info.yPosition] replaceObjectAtIndex:info.xPosition withObject:cell];

[self insertSubview:cell atIndex:0];

// remove any existing view at this frame
for (UIView *v in self.subviews) {
if ([v isKindOfClass:[DTGridViewCell class]] &&
v.frame.origin.x == cell.frame.origin.x &&
v.frame.origin.y == cell.frame.origin.y &&
v != cell) {

[v removeFromSuperview];
break;
}
}

[cell release];

}

- (void)removeCellWithInfo:(DTGridViewCellInfo *)info {



if (info.yPosition > [gridCells count]) return;

NSMutableArray *row = [gridCells objectAtIndex:info.yPosition];

if (info.xPosition > [row count]) return;

DTGridViewCell *cell = [row objectAtIndex:info.xPosition];

if (![cell isKindOfClass:[DTGridViewCell class]]) return;

[cell retain];

[cell removeFromSuperview];

[row replaceObjectAtIndex:info.xPosition withObject:info];

[cellInfoForCellsOnScreen removeObject:info];

// TODO: Should this be set?
//cell.frame = CGRectZero;

[freeCells addObject:cell];

[cell release];
}

- (BOOL)cellInfoShouldBeOnShow:(NSObject<DTGridViewCellInfoProtocol> *)info {

if (!info || ![info isMemberOfClass:[DTGridViewCellInfo class]]) return NO;

return (!(info.frame.origin.x + info.frame.size.width < self.contentOffset.x
|| info.frame.origin.y + info.frame.size.height < self.contentOffset.y
|| info.frame.origin.x > self.contentOffset.x + self.frame.size.width
|| info.frame.origin.y > self.contentOffset.y + self.frame.size.height));
}

#pragma mark -
#pragma mark Finding Infomation from DataSource

- (CGFloat)findWidthForRow:(NSInteger)row column:(NSInteger)column {
return [self.dataSource gridView:self widthForCellAtRow:row column:column];
}

- (NSInteger)findNumberOfRows {
return [self.dataSource numberOfRowsInGridView:self];
}

- (NSInteger)findNumberOfColumnsForRow:(NSInteger)row {
return [self.dataSource numberOfColumnsInGridView:self forRowWithIndex:row];
}

- (CGFloat)findHeightForRow:(NSInteger)row {
return [self.dataSource gridView:self heightForRow:row];
}

- (DTGridViewCell *)findViewForRow:(NSInteger)row column:(NSInteger)column {
return [self.dataSource gridView:self viewForRow:row column:column];
}
#pragma mark -

- (void)loadData {

hasLoadedData = YES;

if (![self.dataSource respondsToSelector:@selector(numberOfRowsInGridView:)])
return;

self.numberOfRows = [self findNumberOfRows];

if (!self.numberOfRows)
return;

[gridRows removeAllObjects];
[rowHeights removeAllObjects];
[rowPositions removeAllObjects];

NSMutableArray *cellInfoArrayRows = [[NSMutableArray alloc] init];

CGFloat maxHeight = 0;
CGFloat maxWidth = 0;


for (NSInteger i = 0; i < self.numberOfRows; i++) {

NSInteger numberOfCols = [self findNumberOfColumnsForRow:i];

NSMutableArray *cellInfoArrayCols = [[NSMutableArray alloc] init];

for (NSInteger j = 0; j < numberOfCols; j++) {


DTGridViewCellInfo *info = [[DTGridViewCellInfo alloc] init];

info.xPosition = j;
info.yPosition = i;


CGFloat height = [self findHeightForRow:i];
CGFloat width = [self findWidthForRow:i column:j];

//info.frame.size.height = [dataSource gridView:self heightForRow:i];
//info.frame.size.width = [dataSource gridView:self widthForCellAtRow:i column:j];
CGFloat y;
CGFloat x;

if (i == 0) {
y = 0.0;
//info.frame.origin.y = 0.0;
} else {
DTGridViewCellInfo *previousCellRow = [[cellInfoArrayRows objectAtIndex:i-1] objectAtIndex:0];
y = previousCellRow.frame.origin.y + previousCellRow.frame.size.height;

if (cellOffset.y != 0)
y += cellOffset.y;
}

if (j == 0) {
x = 0.0;
} else {
DTGridViewCellInfo *previousCellRow = [cellInfoArrayCols objectAtIndex:j-1];
x = previousCellRow.frame.origin.x + previousCellRow.frame.size.width;
if (cellOffset.x != 0)
x += cellOffset.x;
}

if (maxHeight < y + height)
maxHeight = y + height;

if (maxWidth < x + width)
maxWidth = x + width;

info.frame = CGRectMake(x,y,width,height);

[cellInfoArrayCols addObject:info];

[info release];
}

[cellInfoArrayRows addObject:cellInfoArrayCols];
[cellInfoArrayCols release];
}


self.contentSize = CGSizeMake(maxWidth, maxHeight);

self.gridCells = cellInfoArrayRows;
[cellInfoArrayRows release];

if ([self.subviews count] > [self.gridCells count]) {
// the underlying data must have reduced, time to iterate
NSSet *gridCellsSet = [NSSet setWithArray:self.gridCells];
NSArray *subviewsCopy = [self.subviews copy];

for (DTGridViewCell *cell in subviewsCopy) {
if (![gridCellsSet member:cell])
[cell removeFromSuperview];
}

[subviewsCopy release];
}
}

- (void)checkViews {

if ([cellInfoForCellsOnScreen count] == 0) {
[self initialiseViews];
return;
}

NSMutableDictionary *leftRightCells = [[NSMutableDictionary alloc] init];

NSArray *orderedCells = [cellInfoForCellsOnScreen copy];

BOOL isGoingUp = NO;
BOOL isGoingDown = NO;
BOOL isGoingLeft = NO;
BOOL isGoingRight = NO;

if (self.contentOffset.y < oldContentOffset.y && self.contentOffset.y >= 0)
isGoingUp = YES;
else if (self.contentOffset.y > oldContentOffset.y && self.contentOffset.y + self.frame.size.height < self.contentSize.height)
isGoingDown = YES;
else if (hasResized)
isGoingUp = YES;

if (self.contentOffset.x < oldContentOffset.x && self.contentOffset.x >= 0)
isGoingLeft = YES;
else if (self.contentOffset.x > oldContentOffset.x && self.contentOffset.x + self.frame.size.width < self.contentSize.width)
isGoingRight = YES;
else if (hasResized)
isGoingRight = YES;

hasResized = NO;
oldContentOffset = self.contentOffset;

for (DTGridViewCellInfo *info in orderedCells) {

if (isGoingLeft){
if (info.xPosition > 0 && info.frame.origin.x > self.contentOffset.x)
if (![leftRightCells objectForKey:[NSString stringWithFormat:@"%i", info.yPosition]])
[leftRightCells setObject:info forKey:[NSString stringWithFormat:@"%i", info.yPosition]];
else if ([[leftRightCells objectForKey:[NSString stringWithFormat:@"%i", info.yPosition]] xPosition] > info.xPosition)
[leftRightCells setObject:info forKey:[NSString stringWithFormat:@"%i", info.yPosition]];

} else if (isGoingRight) {
if ([[self.gridCells objectAtIndex:info.yPosition] count] - 1 > info.xPosition && info.frame.origin.x + info.frame.size.width < self.contentOffset.x + self.frame.size.width)
if (![leftRightCells objectForKey:[NSString stringWithFormat:@"%i", info.yPosition]])
[leftRightCells setObject:info forKey:[NSString stringWithFormat:@"%i", info.yPosition]];
else if ([[leftRightCells objectForKey:[NSString stringWithFormat:@"%i", info.yPosition]] xPosition] < info.xPosition)
[leftRightCells setObject:info forKey:[NSString stringWithFormat:@"%i", info.yPosition]];
}

if (![self cellInfoShouldBeOnShow:info])
[self removeCellWithInfo:info];

}

if (isGoingLeft) {
for (NSString *yPos in [leftRightCells allKeys]) {
DTGridViewCellInfo *info = [leftRightCells objectForKey:yPos];
[self checkRow:info.yPosition column:info.xPosition goingLeft:YES];
}

} else if (isGoingRight) {
for (NSString *yPos in [leftRightCells allKeys]) {
DTGridViewCellInfo *info = [leftRightCells objectForKey:yPos];
[self checkRow:info.yPosition column:info.xPosition goingLeft:NO];
}
}

if (isGoingUp)
[self checkNewRowStartingWithCellInfo:[orderedCells objectAtIndex:0] goingUp:YES];
else if (isGoingDown)
[self checkNewRowStartingWithCellInfo:[orderedCells lastObject] goingUp:NO];


[leftRightCells release];
[orderedCells release];
}

- (void)initialiseViews {

for (NSInteger i = 0; i < [cellInfoForCellsOnScreen count]; i++) {

DTGridViewCellInfo *info = [cellInfoForCellsOnScreen objectAtIndex:i];

if (![self cellInfoShouldBeOnShow:info])
[self removeCellWithInfo:info];

}

for (NSInteger i = 0; i < [gridCells count]; i++) {

NSMutableArray *row = [gridCells objectAtIndex:i];

for (NSInteger j = 0; j < [row count]; j++) {

id object = [row objectAtIndex:j];

if ([object isMemberOfClass:[DTGridViewCellInfo class]]) {

DTGridViewCellInfo *info = (DTGridViewCellInfo *)object;

if ([self cellInfoShouldBeOnShow:info])
[self addCellWithInfo:info];

}
}
}
}

- (void)checkRow:(NSInteger)row column:(NSInteger)col goingLeft:(BOOL)goingLeft {

NSObject<DTGridViewCellInfoProtocol> *info = [self cellInfoForRow:row column:col];

if (!info) return;

if ([self cellInfoShouldBeOnShow:info])
[self addCellWithInfo:info];

if (goingLeft) {
if (info.frame.origin.x > self.contentOffset.x)
[self checkRow:row column:(col - 1) goingLeft:goingLeft];
} else {
if (info.frame.origin.x + info.frame.size.width < self.contentOffset.x + self.frame.size.width)
[self checkRow:row column:(col + 1) goingLeft:goingLeft];
}
}

- (NSObject<DTGridViewCellInfoProtocol> *)cellInfoForRow:(NSInteger)row column:(NSInteger)col {

if (row < 0 || col < 0) return nil;

if ([self.gridCells count] <= row) return nil;

NSArray *rowArray = [self.gridCells objectAtIndex:row];

if ([rowArray count] <= col) return nil;

return (NSObject<DTGridViewCellInfoProtocol> *)[rowArray objectAtIndex:col];
}

- (void)checkNewRowStartingWithCellInfo:(NSObject<DTGridViewCellInfoProtocol> *)info goingUp:(BOOL)goingUp {

if (!info) return;

if (!(info.frame.origin.y + info.frame.size.height >= self.contentOffset.y && info.frame.origin.y <= self.contentOffset.y + self.frame.size.height)) return;

NSObject<DTGridViewCellInfoProtocol> *infoToCheck = info;

NSInteger row = info.yPosition;
NSInteger total = [[self.gridCells objectAtIndex:row] count];
NSInteger goingRightPosition = info.xPosition;
NSInteger goingLeftPosition = info.xPosition;
BOOL goingLeft = NO;

while (![self cellInfoShouldBeOnShow:infoToCheck]) {

goingLeft = !goingLeft;

if (goingLeft)
infoToCheck = [self cellInfoForRow:row column:--goingLeftPosition];
else
infoToCheck = [self cellInfoForRow:row column:++goingRightPosition];

if (goingRightPosition > total)
return;
}

if ([infoToCheck isEqual:info]) {
[self checkRow:infoToCheck.yPosition column:infoToCheck.xPosition goingLeft:YES];
[self checkRow:infoToCheck.yPosition column:infoToCheck.xPosition goingLeft:NO];
} else {
[self checkRow:infoToCheck.yPosition column:infoToCheck.xPosition goingLeft:goingLeft];
}

NSObject<DTGridViewCellInfoProtocol> *nextInfo = nil;

if (goingUp)
nextInfo = [self cellInfoForRow:info.yPosition - 1 column:info.xPosition];
else
nextInfo = [self cellInfoForRow:info.yPosition + 1 column:info.xPosition];

if (nextInfo)
[self checkNewRowStartingWithCellInfo:nextInfo goingUp:goingUp];
}

#pragma mark Public methods

- (DTGridViewCell *)dequeueReusableCellWithIdentifier:(NSString *)identifier {

for (DTGridViewCell *c in freeCells) {
if ([c.identifier isEqualToString:identifier]) {
[c retain];
[freeCells removeObject:c];
[c prepareForReuse];
return [c autorelease];
}
}

return nil;
}

- (DTGridViewCell *)cellForRow:(NSInteger)rowIndex column:(NSInteger)columnIndex {

for (UIView *v in self.subviews) {
if ([v isKindOfClass:[DTGridViewCell class]]) {
DTGridViewCell *c = (DTGridViewCell *)v;
if (c.xPosition == columnIndex && c.yPosition == rowIndex)
return c;
}
}

return nil;
}

- (void)scrollViewToRow:(NSInteger)rowIndex column:(NSInteger)columnIndex scrollPosition:(DTGridViewScrollPosition)position animated:(BOOL)animated {

CGFloat xPos = 0, yPos = 0;

CGRect cellFrame = [[[self.gridCells objectAtIndex:rowIndex] objectAtIndex:columnIndex] frame];

// working out x co-ord

if (position == DTGridViewScrollPositionTopLeft || position == DTGridViewScrollPositionMiddleLeft || position == DTGridViewScrollPositionBottomLeft)
xPos = cellFrame.origin.x;

else if (position == DTGridViewScrollPositionTopRight || position == DTGridViewScrollPositionMiddleRight || position == DTGridViewScrollPositionBottomRight)
xPos = cellFrame.origin.x + cellFrame.size.width - self.frame.size.width;

else if (position == DTGridViewScrollPositionTopCenter || position == DTGridViewScrollPositionMiddleCenter || position == DTGridViewScrollPositionBottomCenter)
xPos = (cellFrame.origin.x + (cellFrame.size.width / 2)) - (self.frame.size.width / 2);

else if (position == DTGridViewScrollPositionNone) {

BOOL isBig = NO;

if (cellFrame.size.width > self.frame.size.width)
isBig = YES;

if ((cellFrame.origin.x < self.contentOffset.x)
&& ((cellFrame.origin.x + cellFrame.size.width) > (self.contentOffset.x + self.frame.size.width)))
xPos = self.contentOffset.x;

else if (cellFrame.origin.x < self.contentOffset.x)
if (isBig)
xPos = (cellFrame.origin.x + cellFrame.size.width) - self.frame.size.width;
else
xPos = cellFrame.origin.x;

else if ((cellFrame.origin.x + cellFrame.size.width) > (self.contentOffset.x + self.frame.size.width))
if (isBig)
xPos = cellFrame.origin.x;
else
xPos = (cellFrame.origin.x + cellFrame.size.width) - self.frame.size.width;
else
xPos = self.contentOffset.x;
}

// working out y co-ord

if (position == DTGridViewScrollPositionTopLeft || position == DTGridViewScrollPositionTopCenter || position == DTGridViewScrollPositionTopRight) {
yPos = cellFrame.origin.y;

} else if (position == DTGridViewScrollPositionBottomLeft || position == DTGridViewScrollPositionBottomCenter || position == DTGridViewScrollPositionBottomRight) {
yPos = cellFrame.origin.y + cellFrame.size.height - self.frame.size.height;

} else if (position == DTGridViewScrollPositionMiddleLeft || position == DTGridViewScrollPositionMiddleCenter || position == DTGridViewScrollPositionMiddleRight) {
yPos = (cellFrame.origin.y + (cellFrame.size.height / 2)) - (self.frame.size.height / 2);

} else if (position == DTGridViewScrollPositionNone) {
BOOL isBig = NO;

if (cellFrame.size.height > self.frame.size.height)
isBig = YES;

if ((cellFrame.origin.y < self.contentOffset.y)
&& ((cellFrame.origin.y + cellFrame.size.height) > (self.contentOffset.y + self.frame.size.height)))
yPos = self.contentOffset.y;

else if (cellFrame.origin.y < self.contentOffset.y)
if (isBig)
yPos = (cellFrame.origin.y + cellFrame.size.height) - self.frame.size.height;
else
yPos = cellFrame.origin.y;
else if ((cellFrame.origin.y + cellFrame.size.height) > (self.contentOffset.y + self.frame.size.height))
if (isBig)
yPos = cellFrame.origin.y;
else
yPos = (cellFrame.origin.y + cellFrame.size.height) - self.frame.size.height;
else
yPos = self.contentOffset.y;
}

if (xPos == self.contentOffset.x && yPos == self.contentOffset.y)
return;

if (xPos > self.contentSize.width - self.frame.size.width)
xPos = self.contentSize.width - self.frame.size.width;
else if (xPos < 0)
xPos = 0.0;

if (yPos > self.contentSize.height - self.frame.size.height)
yPos = self.contentSize.height - self.frame.size.height;
else if (yPos < 0)
yPos = 0.0;

[self scrollRectToVisible:CGRectMake(xPos, yPos, self.frame.size.width, self.frame.size.height) animated:animated];

if (!animated)
[self checkViews];

if ([self.delegate respondsToSelector:@selector(gridView:didProgrammaticallyScrollToRow:column:)])
[self.delegate gridView:self didProgrammaticallyScrollToRow:rowIndex column:columnIndex];


}

- (void)selectRow:(NSInteger)rowIndex column:(NSInteger)columnIndex scrollPosition:(DTGridViewScrollPosition)position animated:(BOOL)animated {

for (UIView *v in self.subviews) {
if ([v isKindOfClass:[DTGridViewCell class]]) {
DTGridViewCell *c = (DTGridViewCell *)v;
if (c.xPosition == columnIndex && c.yPosition == rowIndex)
c.selected = YES;
else if (c.xPosition == columnIndexOfSelectedCell && c.yPosition == rowIndexOfSelectedCell)
c.selected = NO;
}
}
rowIndexOfSelectedCell = rowIndex;
columnIndexOfSelectedCell = columnIndex;

[self scrollViewToRow:rowIndex column:columnIndex scrollPosition:position animated:animated];
}

- (void)positionCheck {}

- (void)fireEdgeScroll {

if (self.pagingEnabled)
if ([self.delegate respondsToSelector:@selector(pagedGridView:didScrollToRow:column:)])
[self.delegate pagedGridView:self didScrollToRow:((NSInteger)(self.contentOffset.y / self.frame.size.height)) column:((NSInteger)(self.contentOffset.x / self.frame.size.width))];

if ([self.delegate respondsToSelector:@selector(gridView:scrolledToEdge:)]) {

if (self.contentOffset.x <= 0)
[self.delegate gridView:self scrolledToEdge:DTGridViewEdgeLeft];

if (self.contentOffset.x >= self.contentSize.width - self.frame.size.width)
[self.delegate gridView:self scrolledToEdge:DTGridViewEdgeRight];

if (self.contentOffset.y <= 0)
[self.delegate gridView:self scrolledToEdge:DTGridViewEdgeTop];

if (self.contentOffset.y >= self.contentSize.height - self.frame.size.height)
[self.delegate gridView:self scrolledToEdge:DTGridViewEdgeBottom];
}
}

- (void)gridViewCellWasTouched:(DTGridViewCell *)cell {

[self bringSubviewToFront:cell];

if ([self.delegate respondsToSelector:@selector(gridView:selectionMadeAtRow:column:)])
[self.delegate gridView:self selectionMadeAtRow:cell.yPosition column:cell.xPosition];
}


#pragma mark -
#pragma mark Accessors

- (NSInteger)numberOfRows {
if (numberOfRows == DTGridViewInvalid) {
numberOfRows = [self.dataSource numberOfRowsInGridView:self];
}

return numberOfRows;
}

@end
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