SlideShowCase.apxc

/*
 * @Author: Durval Slompo Junior
 * Controller to show SlideShow of images from Case object
 */
public class SlideShowCase {    
    public String tmp {get; set;}
    
    private final Case caso;
    private Integer posicao = 0;
    private List<ContentVersion> idContentVersions;
    
    public Integer getPosicao(){
        return posicao + 1;
    }
    
    public Integer getSize(){
        return idContentVersions.size();
    }
    
    public SlideShowCase(ApexPages.StandardController stdController) {
        this.caso = (Case)stdController.getRecord();
    	init();
    }
    
    public void init(){
        List<ContentDocumentLink> docs = 
                [SELECT Id, LinkedEntityId, ContentDocumentId, Visibility, IsDeleted, ShareType,
                ContentDocument.Title, ContentDocument.createdDate, ContentDocument.FileType
                FROM ContentDocumentLink WHERE LinkedEntityId = :caso.Id]; 
        
        List<String> idContentDocuments = new List<String>();
        for(ContentDocumentLink cdl : docs){
            System.debug(cdl.ContentDocumentId);
            idContentDocuments.add(cdl.ContentDocumentId);
        }
        idContentVersions = [select Id from ContentVersion where ContentDocumentId in :idContentDocuments
                             and FileExtension IN ('png', 'jpg', 'jpeg', 'bmp')];
        if(idContentVersions.size()>0){
            ContentVersion cv = idContentVersions.get(0);
            tmp = '../sfc/servlet.shepherd/version/download/' + cv.Id;
        }
    }
    
    public void prev()
    {
        if(posicao != 0){
            posicao = posicao - 1;
            ContentVersion cv = idContentVersions.get(posicao);
            tmp = '../sfc/servlet.shepherd/version/download/' + cv.Id;
        }
    }   

    public void nxt()
    {  
        if(posicao != (idContentVersions.size()-1))
        {
            posicao = posicao + 1;
            ContentVersion cv = idContentVersions.get(posicao);
            tmp = '../sfc/servlet.shepherd/version/download/' + cv.Id;
        } 
    }
}