从这里下载了 CCScrollLayer Cocos2D 扩展： https ://github.com/cocos2d/cocos2d-iphone-extensions/tree/master/Extensions/CCScrollLayer
不确定它有多重要，因为我认为这更像是一个 OpenGL 问题，但该层的目的是向 CCLayer 对象添加惯性滚动功能。
我不明白为什么——如果我没有以任何方式修改代码并且很多其他人说它工作正常——我在 Xcode 4.5 中遇到“使用未声明的变量”错误。它抱怨的行在 .m 文件中：
glEnable(GL_POINT_SMOOTH);
GL_POINT_SMOOTH 是无法识别的常量。我不知道我可以用什么作为替代品，也不知道如何为它#define 一个值。任何具有 Cocos2D 或 OpenGL 知识的人都知道我可以做些什么来解决这个问题？这里分别是 .h 和 .m 文件，供任何感兴趣的人使用。我没有在我的项目中包含我正在使用的任何 OpenGL 文件。让我知道你是否需要他们。
。H
/*
* CCScrollLayer
*
* Cocos2D-iPhone-Extensions v0.2.1
* https://github.com/cocos2d/cocos2d-iphone-extensions
*
* Copyright 2010 DK101
* http://dk101.net/2010/11/30/implementing-page-scrolling-in-cocos2d/
*
* Copyright 2010 Giv Parvaneh.
* http://www.givp.org/blog/2010/12/30/scrolling-menus-in-cocos2d/
*
* Copyright 2011-2012 Stepan Generalov
* Copyright 2011 Brian Feller
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
*/
#import <Foundation/Foundation.h>
#import "cocos2d.h"
@class CCScrollLayer;
@protocol CCScrollLayerDelegate
@optional
/** Called when scroll layer begins scrolling.
* Usefull to cancel CCTouchDispatcher standardDelegates.
*/
- (void) scrollLayerScrollingStarted:(CCScrollLayer *) sender;
/** Called at the end of moveToPage:
* Doesn't get called in selectPage:
*/
- (void) scrollLayer: (CCScrollLayer *) sender scrolledToPageNumber: (int) page;
@end
/** Scrolling layer for Menus, like iOS Springboard Screen.
*
* It is a very clean and elegant subclass of CCLayer that lets you pass-in an array
* of layers and it will then create a smooth scroller.
* Complete with the "snapping" effect. You can create screens with anything that can be added to a CCLayer.
*
* @version 0.2.1
*/
@interface CCScrollLayer : CCLayer
{
NSObject <CCScrollLayerDelegate> *delegate_;
// Holds the current page being displayed.
int currentScreen_;
// Number of previous page being displayed.
int prevScreen_;
// The x coord of initial point the user starts their swipe.
CGFloat startSwipe_;
// For what distance user must slide finger to start scrolling menu.
CGFloat minimumTouchLengthToSlide_;
// For what distance user must slide finger to change the page.
CGFloat minimumTouchLengthToChangePage_;
// Whenever show or not gray/white dots under scrolling content.
BOOL showPagesIndicator_;
CGPoint pagesIndicatorPosition_;
ccColor4B pagesIndicatorSelectedColor_;
ccColor4B pagesIndicatorNormalColor_;
// Internal state of scrollLayer (scrolling or idle).
int state_;
BOOL stealTouches_;
#ifdef __IPHONE_OS_VERSION_MAX_ALLOWED
// Holds the touch that started the scroll
UITouch *scrollTouch_;
#endif
// Holds pages.
NSMutableArray *layers_;
// Holds current pages width offset.
CGFloat pagesWidthOffset_;
// Holds current margin offset
CGFloat marginOffset_;
}
@property (readwrite, assign) NSObject <CCScrollLayerDelegate> *delegate;
#pragma mark Scroll Config Properties
/** Calibration property. Minimum moving touch length that is enough
* to cancel menu items and start scrolling a layer.
*/
@property(readwrite, assign) CGFloat minimumTouchLengthToSlide;
/** Calibration property. Minimum moving touch length that is enough to change
* the page, without snapping back to the previous selected page.
*/
@property(readwrite, assign) CGFloat minimumTouchLengthToChangePage;
/** Offset that can be used to let user see empty space over first or last page. */
@property(readwrite, assign) CGFloat marginOffset;
/** If YES - when starting scrolling CCScrollLayer will claim touches, that are
* already claimed by others targetedTouchDelegates by calling CCTouchDispatcher#touchesCancelled
* Usefull to have ability to scroll with touch above menus in pages.
* If NO - scrolling will start, but no touches will be cancelled.
* Default is YES.
*/
@property(readwrite) BOOL stealTouches;
#pragma mark Pages Indicator Properties
/** Whenever show or not white/grey dots under the scroll layer.
* If yes - dots will be rendered in parents transform (rendered after scroller visit).
*/
@property(readwrite, assign) BOOL showPagesIndicator;
/** Position of dots center in parent coordinates.
* (Default value is screenWidth/2, screenHeight/4)
*/
@property(readwrite, assign) CGPoint pagesIndicatorPosition;
/** Color of dot, that represents current selected page(only one dot). */
@property(readwrite, assign) ccColor4B pagesIndicatorSelectedColor;
/** Color of dots, that represents other pages. */
@property(readwrite, assign) ccColor4B pagesIndicatorNormalColor;
#pragma mark Pages Control Properties
/** Total pages available in scrollLayer. */
@property(readonly) int totalScreens;
/** Current page number, that is shown. Belongs to the [0, totalScreen] interval. */
@property(readonly) int currentScreen;
/** Offset, that can be used to let user see next/previous page. */
@property(readwrite) CGFloat pagesWidthOffset;
/** Returns array of pages CCLayer's */
@property(readonly) NSArray *pages;
#pragma mark Init/Creation
/** Creates new scrollLayer with given pages & width offset.
* @param layers NSArray of CCLayers, that will be used as pages.
* @param widthOffset Length in X-coord, that describes length of possible pages
* intersection. */
+(id) nodeWithLayers:(NSArray *)layers widthOffset: (int) widthOffset;
/** Inits scrollLayer with given pages & width offset.
* @param layers NSArray of CCLayers, that will be used as pages.
* @param widthOffset Length in X-coord, that describes length of possible pages
* intersection. */
-(id) initWithLayers:(NSArray *)layers widthOffset: (int) widthOffset;
#pragma mark Updates
/** Updates all pages positions & adds them as children if needed.
* Can be used to update position of pages after screen reshape, or
* for update after dynamic page add/remove.
*/
- (void) updatePages;
#pragma mark Adding/Removing Pages
/** Adds new page and reorders pages trying to set given number for newly added page.
* If number > pages count - adds new page to the right end of the scroll layer.
* If number <= 0 - adds new page to the left end of the scroll layer.
* @attention Designated addPage method.
*/
- (void) addPage: (CCLayer *) aPage withNumber: (int) pageNumber;
/** Adds new page to the right end of the scroll layer. */
- (void) addPage: (CCLayer *) aPage;
/** Removes page if it's one of scroll layers pages (not children)
* Does nothing if page not found.
*/
- (void) removePage: (CCLayer *) aPage;
/** Removes page with given number. Doesn nothing if there's no page for such number. */
- (void) removePageWithNumber: (int) page;
#pragma mark Moving/Selecting Pages
/* Moves scrollLayer to page with given number & invokes delegate
* method scrollLayer:scrolledToPageNumber: at the end of CCMoveTo action.
* Does nothing if number >= totalScreens or < 0.
*/
-(void) moveToPage:(int)page;
/* Immedeatly moves scrollLayer to page with given number without running CCMoveTo.
* Does nothing if number >= totalScreens or < 0.
*/
-(void) selectPage:(int)page;
@end
和 .m 文件：
/*
* CCScrollLayer
*
* Cocos2D-iPhone-Extensions v0.2.1
* https://github.com/cocos2d/cocos2d-iphone-extensions
*
* Copyright 2010 DK101
* http://dk101.net/2010/11/30/implementing-page-scrolling-in-cocos2d/
*
* Copyright 2010 Giv Parvaneh.
* http://www.givp.org/blog/2010/12/30/scrolling-menus-in-cocos2d/
*
* Copyright 2011-2012 Stepan Generalov
* Copyright 2011 Brian Feller
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
*/
#import "CCScrollLayer.h"
#import "CCGL.h"
enum
{
kCCScrollLayerStateIdle,
kCCScrollLayerStateSliding,
};
#ifdef __IPHONE_OS_VERSION_MAX_ALLOWED
@interface CCTouchDispatcher (targetedHandlersGetter)
- (id<NSFastEnumeration>) targetedHandlers;
@end
@implementation CCTouchDispatcher (targetedHandlersGetter)
- (id<NSFastEnumeration>) targetedHandlers
{
return targetedHandlers;
}
@end
#endif
@interface CCScrollLayer ()
- (int) pageNumberForPosition: (CGPoint) position;
@end
@implementation CCScrollLayer
@synthesize delegate = delegate_;
@synthesize minimumTouchLengthToSlide = minimumTouchLengthToSlide_;
@synthesize minimumTouchLengthToChangePage = minimumTouchLengthToChangePage_;
@synthesize marginOffset = marginOffset_;
@synthesize currentScreen = currentScreen_;
@synthesize showPagesIndicator = showPagesIndicator_;
@synthesize pagesIndicatorPosition = pagesIndicatorPosition_;
@synthesize pagesIndicatorNormalColor = pagesIndicatorNormalColor_;
@synthesize pagesIndicatorSelectedColor = pagesIndicatorSelectedColor_;
@synthesize pagesWidthOffset = pagesWidthOffset_;
@synthesize pages = layers_;
@synthesize stealTouches = stealTouches_;
@dynamic totalScreens;
- (int) totalScreens
{
return [layers_ count];
}
+(id) nodeWithLayers:(NSArray *)layers widthOffset: (int) widthOffset
{
return [[[self alloc] initWithLayers: layers widthOffset:widthOffset] autorelease];
}
-(id) initWithLayers:(NSArray *)layers widthOffset: (int) widthOffset
{
if ( (self = [super init]) )
{
NSAssert([layers count], @"CCScrollLayer#initWithLayers:widthOffset: you must provide at least one layer!");
// Enable Touches/Mouse.
#ifdef __IPHONE_OS_VERSION_MAX_ALLOWED
self.isTouchEnabled = YES;
#elif defined(__MAC_OS_X_VERSION_MAX_ALLOWED)
self.isMouseEnabled = YES;
#endif
self.stealTouches = YES;
// Set default minimum touch length to scroll.
self.minimumTouchLengthToSlide = 30.0f;
self.minimumTouchLengthToChangePage = 100.0f;
self.marginOffset = [[CCDirector sharedDirector] winSize].width;
// Show indicator by default.
self.showPagesIndicator = YES;
self.pagesIndicatorPosition = ccp(0.5f * self.contentSize.width, ceilf ( self.contentSize.height / 8.0f ));
self.pagesIndicatorNormalColor = ccc4(0x96,0x96,0x96,0xFF);
self.pagesIndicatorSelectedColor = ccc4(0xFF,0xFF,0xFF,0xFF);
// Set up the starting variables
currentScreen_ = 0;
// Save offset.
self.pagesWidthOffset = widthOffset;
// Save array of layers.
layers_ = [[NSMutableArray alloc] initWithArray:layers copyItems:NO];
[self updatePages];
}
return self;
}
- (void) dealloc
{
self.delegate = nil;
[layers_ release];
layers_ = nil;
[super dealloc];
}
- (void) updatePages
{
// Loop through the array and add the screens if needed.
int i = 0;
for (CCLayer *l in layers_)
{
l.anchorPoint = ccp(0,0);
l.contentSize = [CCDirector sharedDirector].winSize;
l.position = ccp( (i * (self.contentSize.width - self.pagesWidthOffset)), 0 );
if (!l.parent)
[self addChild:l];
i++;
}
}
#pragma mark CCLayer Methods ReImpl
- (void) visit
{
[super visit];//< Will draw after glPopScene.
if (self.showPagesIndicator)
{
int totalScreens = [layers_ count];
// Prepare Points Array
CGFloat n = (CGFloat)totalScreens; //< Total points count in CGFloat.
CGFloat pY = self.pagesIndicatorPosition.y; //< Points y-coord in parent coord sys.
CGFloat d = 16.0f; //< Distance between points.
CGPoint points[totalScreens];
for (int i=0; i < totalScreens; ++i)
{
CGFloat pX = self.pagesIndicatorPosition.x + d * ( (CGFloat)i - 0.5f*(n-1.0f) );
points[i] = ccp (pX, pY);
}
// Set GL Values
#if COCOS2D_VERSION >= 0x00020000
ccGLEnable(CC_GL_BLEND);
ccPointSize( 6.0 * CC_CONTENT_SCALE_FACTOR() );
#define DRAW_4B_FUNC ccDrawColor4B
#else
glEnable(GL_POINT_SMOOTH);
GLboolean blendWasEnabled = glIsEnabled( GL_BLEND );
glEnable(GL_BLEND);
// save the old blending functions
int blend_src = 0;
int blend_dst = 0;
glGetIntegerv( GL_BLEND_SRC, &blend_src );
glGetIntegerv( GL_BLEND_DST, &blend_dst );
glPointSize( 6.0 * CC_CONTENT_SCALE_FACTOR() );
#define DRAW_4B_FUNC glColor4ub
#endif
glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
// Draw Gray Points
DRAW_4B_FUNC(pagesIndicatorNormalColor_.r,
pagesIndicatorNormalColor_.g,
pagesIndicatorNormalColor_.b,
pagesIndicatorNormalColor_.a);
ccDrawPoints( points, totalScreens );
// Draw White Point for Selected Page
DRAW_4B_FUNC(pagesIndicatorSelectedColor_.r,
pagesIndicatorSelectedColor_.g,
pagesIndicatorSelectedColor_.b,
pagesIndicatorSelectedColor_.a);
ccDrawPoint(points[currentScreen_]);
// Restore GL Values
#if COCOS2D_VERSION >= 0x00020000
ccPointSize(1.0f);
#else
glPointSize(1.0f);
glDisable(GL_POINT_SMOOTH);
if (! blendWasEnabled)
glDisable(GL_BLEND);
// always restore the blending functions too
glBlendFunc( blend_src, blend_dst );
#endif
}
}
#pragma mark Moving To / Selecting Pages
- (void) moveToPageEnded
{
if (prevScreen_ != currentScreen_)
{
if ([self.delegate respondsToSelector:@selector(scrollLayer:scrolledToPageNumber:)])
[self.delegate scrollLayer: self scrolledToPageNumber: currentScreen_];
}
prevScreen_ = currentScreen_ = [self pageNumberForPosition:self.position];
}
- (int) pageNumberForPosition: (CGPoint) position
{
CGFloat pageFloat = - self.position.x / (self.contentSize.width - self.pagesWidthOffset);
int pageNumber = ceilf(pageFloat);
if ( (CGFloat)pageNumber - pageFloat >= 0.5f)
pageNumber--;
pageNumber = MAX(0, pageNumber);
pageNumber = MIN([layers_ count] - 1, pageNumber);
return pageNumber;
}
- (CGPoint) positionForPageWithNumber: (int) pageNumber
{
return ccp( - pageNumber * (self.contentSize.width - self.pagesWidthOffset), 0.0f );
}
-(void) moveToPage:(int)page
{
if (page < 0 || page >= [layers_ count]) {
CCLOGERROR(@"CCScrollLayer#moveToPage: %d - wrong page number, out of bounds. ", page);
return;
}
id changePage = [CCMoveTo actionWithDuration:0.3 position: [self positionForPageWithNumber: page]];
changePage = [CCSequence actions: changePage,[CCCallFunc actionWithTarget:self selector:@selector(moveToPageEnded)], nil];
[self runAction:changePage];
currentScreen_ = page;
}
-(void) selectPage:(int)page
{
if (page < 0 || page >= [layers_ count]) {
CCLOGERROR(@"CCScrollLayer#selectPage: %d - wrong page number, out of bounds. ", page);
return;
}
self.position = [self positionForPageWithNumber: page];
prevScreen_ = currentScreen_;
currentScreen_ = page;
}
#pragma mark Dynamic Pages Control
- (void) addPage: (CCLayer *) aPage
{
[self addPage: aPage withNumber: [layers_ count]];
}
- (void) addPage: (CCLayer *) aPage withNumber: (int) pageNumber
{
pageNumber = MIN(pageNumber, [layers_ count]);
pageNumber = MAX(pageNumber, 0);
[layers_ insertObject: aPage atIndex: pageNumber];
[self updatePages];
[self moveToPage: currentScreen_];
}
- (void) removePage: (CCLayer *) aPage
{
[layers_ removeObject: aPage];
[self removeChild: aPage cleanup: YES];
[self updatePages];
prevScreen_ = currentScreen_;
currentScreen_ = MIN(currentScreen_, [layers_ count] - 1);
[self moveToPage: currentScreen_];
}
- (void) removePageWithNumber: (int) page
{
if (page >= 0 && page < [layers_ count])
[self removePage:[layers_ objectAtIndex: page]];
}
#pragma mark Touches
#ifdef __IPHONE_OS_VERSION_MAX_ALLOWED
/** Register with more priority than CCMenu's but don't swallow touches. */
-(void) registerWithTouchDispatcher
{
#if COCOS2D_VERSION >= 0x00020000
CCTouchDispatcher *dispatcher = [[CCDirector sharedDirector] touchDispatcher];
int priority = kCCMenuHandlerPriority - 1;
#else
CCTouchDispatcher *dispatcher = [CCTouchDispatcher sharedDispatcher];
int priority = kCCMenuTouchPriority - 1;
#endif
[dispatcher addTargetedDelegate:self priority: priority swallowsTouches:NO];
}
/** Hackish stuff - stole touches from other CCTouchDispatcher targeted delegates.
Used to claim touch without receiving ccTouchBegan. */
- (void) claimTouch: (UITouch *) aTouch
{
#if COCOS2D_VERSION >= 0x00020000
CCTouchDispatcher *dispatcher = [[CCDirector sharedDirector] touchDispatcher];
#else
CCTouchDispatcher *dispatcher = [CCTouchDispatcher sharedDispatcher];
#endif
// Enumerate through all targeted handlers.
for ( CCTargetedTouchHandler *handler in [dispatcher targetedHandlers] )
{
// Only our handler should claim the touch.
if (handler.delegate == self)
{
if (![handler.claimedTouches containsObject: aTouch])
{
[handler.claimedTouches addObject: aTouch];
}
}
else
{
// Steal touch from other targeted delegates, if they claimed it.
if ([handler.claimedTouches containsObject: aTouch])
{
if ([handler.delegate respondsToSelector:@selector(ccTouchCancelled:withEvent:)])
{
[handler.delegate ccTouchCancelled: aTouch withEvent: nil];
}
[handler.claimedTouches removeObject: aTouch];
}
}
}
}
-(void)ccTouchCancelled:(UITouch *)touch withEvent:(UIEvent *)event
{
if( scrollTouch_ == touch ) {
scrollTouch_ = nil;
[self selectPage: currentScreen_];
}
}
-(BOOL) ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event
{
if( scrollTouch_ == nil ) {
scrollTouch_ = touch;
} else {
return NO;
}
CGPoint touchPoint = [touch locationInView:[touch view]];
touchPoint = [[CCDirector sharedDirector] convertToGL:touchPoint];
startSwipe_ = touchPoint.x;
state_ = kCCScrollLayerStateIdle;
return YES;
}
- (void)ccTouchMoved:(UITouch *)touch withEvent:(UIEvent *)event
{
if( scrollTouch_ != touch ) {
return;
}
CGPoint touchPoint = [touch locationInView:[touch view]];
touchPoint = [[CCDirector sharedDirector] convertToGL:touchPoint];
// If finger is dragged for more distance then minimum - start sliding and cancel pressed buttons.
// Of course only if we not already in sliding mode
if ( (state_ != kCCScrollLayerStateSliding)
&& (fabsf(touchPoint.x-startSwipe_) >= self.minimumTouchLengthToSlide) )
{
state_ = kCCScrollLayerStateSliding;
// Avoid jerk after state change.
startSwipe_ = touchPoint.x;
if (self.stealTouches)
{
[self claimTouch: touch];
}
if ([self.delegate respondsToSelector:@selector(scrollLayerScrollingStarted:)])
{
[self.delegate scrollLayerScrollingStarted: self];
}
}
if (state_ == kCCScrollLayerStateSliding)
{
CGFloat desiredX = (- currentScreen_ * (self.contentSize.width - self.pagesWidthOffset)) + touchPoint.x - startSwipe_;
int page = [self pageNumberForPosition:ccp(desiredX, 0)];
CGFloat offset = desiredX - [self positionForPageWithNumber:page].x;
if ((page == 0 && offset > 0) || (page == [layers_ count] - 1 && offset < 0))
offset -= marginOffset_ * offset / [[CCDirector sharedDirector] winSize].width;
else
offset = 0;
self.position = ccp(desiredX - offset, 0);
}
}
- (void)ccTouchEnded:(UITouch *)touch withEvent:(UIEvent *)event
{
if( scrollTouch_ != touch )
return;
scrollTouch_ = nil;
CGPoint touchPoint = [touch locationInView:[touch view]];
touchPoint = [[CCDirector sharedDirector] convertToGL:touchPoint];
int selectedPage = currentScreen_;
CGFloat delta = touchPoint.x - startSwipe_;
if (fabsf(delta) >= self.minimumTouchLengthToChangePage)
{
selectedPage = [self pageNumberForPosition:self.position];
if (selectedPage == currentScreen_)
{
if (delta < 0.f && selectedPage < [layers_ count] - 1)
selectedPage++;
else if (delta > 0.f && selectedPage > 0)
selectedPage--;
}
}
[self moveToPage:selectedPage];
}
#endif
#pragma mark Mouse
#ifdef __MAC_OS_X_VERSION_MAX_ALLOWED
- (NSInteger) mouseDelegatePriority
{
#if COCOS2D_VERSION >= 0x00020000
return kCCMenuHandlerPriority - 1;
#else
return kCCMenuMousePriority - 1;
#endif
}
-(BOOL) ccMouseDown:(NSEvent*)event
{
CGPoint touchPoint = [[CCDirector sharedDirector] convertEventToGL: event];
startSwipe_ = touchPoint.x;
state_ = kCCScrollLayerStateIdle;
return NO;
}
-(BOOL) ccMouseDragged:(NSEvent*)event
{
CGPoint touchPoint = [[CCDirector sharedDirector] convertEventToGL:event];
// If mouse is dragged for more distance then minimum - start sliding.
if ( (state_ != kCCScrollLayerStateSliding)
&& (fabsf(touchPoint.x-startSwipe_) >= self.minimumTouchLengthToSlide) )
{
state_ = kCCScrollLayerStateSliding;
// Avoid jerk after state change.
startSwipe_ = touchPoint.x;
if ([self.delegate respondsToSelector:@selector(scrollLayerScrollingStarted:)])
{
[self.delegate scrollLayerScrollingStarted: self];
}
}
if (state_ == kCCScrollLayerStateSliding)
{
CGFloat desiredX = (- currentScreen_ * (self.contentSize.width - self.pagesWidthOffset)) + touchPoint.x - startSwipe_;
int page = [self pageNumberForPosition:ccp(desiredX, 0)];
CGFloat offset = desiredX - [self positionForPageWithNumber:page].x;
if ((page == 0 && offset > 0) || (page == [layers_ count] - 1 && offset < 0))
offset -= marginOffset_ * offset / [[CCDirector sharedDirector] winSize].width;
else
offset = 0;
self.position = ccp(desiredX - offset, 0);
}
return NO;
}
- (BOOL)ccMouseUp:(NSEvent *)event
{
CGPoint touchPoint = [[CCDirector sharedDirector] convertEventToGL:event];
int selectedPage = currentScreen_;
CGFloat delta = touchPoint.x - startSwipe_;
if (fabsf(delta) >= self.minimumTouchLengthToChangePage)
{
selectedPage = [self pageNumberForPosition:self.position];
if (selectedPage == currentScreen_)
{
if (delta < 0.f && selectedPage < [layers_ count] - 1)
selectedPage++;
else if (delta > 0.f && selectedPage > 0)
selectedPage--;
}
}
[self moveToPage:selectedPage];
return NO;
}
- (BOOL)ccScrollWheel:(NSEvent *)theEvent
{
CGFloat deltaX = [theEvent deltaX];
CGPoint newPos = ccpAdd( self.position, ccp(deltaX, 0.0f) );
newPos.x = MIN(newPos.x, [self positionForPageWithNumber: 0].x);
newPos.x = MAX(newPos.x, [self positionForPageWithNumber: [layers_ count] - 1].x);
self.position = newPos;
prevScreen_ = currentScreen_;
currentScreen_ = [self pageNumberForPosition:self.position];
// Inform delegate about new currentScreen.
if (prevScreen_ != currentScreen_)
{
if ([self.delegate respondsToSelector:@selector(scrollLayer:scrolledToPageNumber:)])
[self.delegate scrollLayer: self scrolledToPageNumber: currentScreen_];
}
prevScreen_ = currentScreen_;
return NO;
}
#endif
@end