cocos2d Custom Controls

对cocos2d的API不熟，写几个控件，略感吃力>_<
咱们现炒现卖，边打基础，边建高楼=。=

CCButton


CCTable
http://www.cnblogs.com/eagley/archive/2011/12/16/2289991.html

CCScrollView
http://www.cocos2d-iphone.org/?s=CCScrollView
http://www.cocos2d-iphone.org/forum/tags/cctableview

-(void)beforeDraw {
        glEnable(GL_SCISSOR_TEST);
        const CGFloat s = [[CCDirector sharedDirector] contentScaleFactor];
        glScissor(self.position.x, self.position.y, viewSize_.width*s, viewSize_.height*s);
}
/**
 * retract what's done in beforeDraw so that there's no side effect to
 * other nodes.
 */
-(void)afterDraw {
        glDisable(GL_SCISSOR_TEST);
}
-(void) visit
{
	// quick return if not visible
	if (!visible_)
		return;
	
	glPushMatrix();
	
	if ( grid_ && grid_.active) {
		[grid_ beforeDraw];
		[self transformAncestors];
	}
	[self transform];
    [self beforeDraw];
	if(children_) {
		ccArray *arrayData = children_->data;
		NSUInteger i=0;
		
		// draw children zOrder < 0
		for( ; i < arrayData->num; i++ ) {
			CCNode *child =  arrayData->arr[i];
			if ( [child zOrder] < 0 ) {
				[child visit];
			} else
				break;
		}
		
		// self draw
		[self draw];
		
		// draw children zOrder >= 0
		for( ; i < arrayData->num; i++ ) {
			CCNode *child =  arrayData->arr[i];
			[child visit];
		}
        
	} else
		[self draw];
	
    [self afterDraw];
	if ( grid_ && grid_.active)
		[grid_ afterDraw:self];
	
	glPopMatrix();
}