public with sharing class TrainingCasefilter {
    
    public id accRecId;
    private integer totalRecs = 0;
    private integer OffsetSize = 0;
    private integer LimitSize= 10;
    
    public TrainingCasefilter(ApexPages.StandardController controller) {
        
        accRecId = [select id from account where id = :ApexPages.currentPage().getParameters().get('id')].id;
        totalRecs = [select count() from case where accountID= :accRecId];
        
    }
    
    List<case> trainingCases;
    
    public List<case> getTrainingCases() {
        if(accRecId != null) {
            trainingCases= [SELECT Id, Contact.name, recordtype.id, casenumber, subject, priority, createddate, status, createdbyid
                            FROM Case
                            WHERE RecordType.Name ='Training' AND account.id=:accRecId LIMIT :LimitSize OFFSET :OffsetSize];
        }
        return trainingCases;
    }    
    
    public void FirstPage()
    {
        OffsetSize = 0;
    }
    public void previous()
    {
        OffsetSize = OffsetSize - LimitSize;
    }public void next()
    {
        OffsetSize = OffsetSize + LimitSize;
    }public void LastPage()
    {
        OffsetSize = totalrecs - math.mod(totalRecs,LimitSize);
    }
    public boolean getprev()
    {
        if(OffsetSize == 0)
            return true;
        else
            return false;
    }
    public boolean getnxt()
    {
        if((OffsetSize + LimitSize) > totalRecs)
            return true;
        else
            return false;
    }
}