O assunto de hoje é sobre a classe MovieClipLoader, falaremos sobre a sua utilidade e suas vantagens sobre a função loadMovie, e também faremos alguns exemplos, que creio eu, interessam a muitos usuários.
Bom, sinta-se à vontade para abrir o Flash e criar um novo filme (Ctrl+N), e em seguida abra o painel de ações (F9).
MovieClipLoader, é uma classe do MX 2004 usada para carregar filmes Flash (SWF) e imagens JPG não-progressivas¹. Não confunda MovieClipLoader com loadMovie(), que apesar de terem a mesma finalidade, são coisas bem distintas. loadMovie() é uma função enquanto MovieClipLoader é uma classe que contém ouvintes (listeners) que lhe informam o status do carregamento da imagem.
Voltando ao Flash, no painel de ações por favor, escreva o seguinte:
Acabamos de criar o objeto MovieClipLoader, salve seu filme com o nome que desejar. Criado o nosso objeto, agora podemos carregar uma imagem. Eu vou utilizar uma imagem que tenho aqui, com tamanho de 25kb. Você pode utilizar a mesma imagem se desejar.
Na mesma pasta que se encontra o seu filme Flash, crie uma nova pasta de nome imagens e dentro dela coloque a imagem firefox.jpg.
Continuando o código no Flash:
Como você pode ver, criamos um MovieClip vazio no _root com o nome de “imagem_mc” e nesse novo MovieClip carregamos nossa imagem através do método loadClip();
“Tá, mas qual a diferença entre isso e o loadMovie()? Até agora só escrevi mais!”
A grande diferença vem agora. Digamos que você queira saber quando a imagem foi carregada, ou quando ela terminou de carregar, ou qual o status de carregamento dela, quanto já foi carregado, se ocorreu algum erro com ela. Para ter isso em mãos antes, era preciso diversas linhas, onde você criava funções, para saber o status do carregamento, etc…
A partir de agora, conheceremos e usaremos os ouvintes (listeners) da classe. Um aviso, a classe contém alguns bugs, sendo assim, alguns eventos da classe não funcionam como deveriam e o comportamento do ouvinte fica desregulado quando você testa o filme no Flash Player. Para ver o filme funcionando corretamente você deve testá-lo em um Browser.
Continuando o código: (o que se encontra em cinza escuro já fazia parte do código, apenas altera a posição de acordo)
Para visualizar o filme, exporte-o e visualize ele no browser.
Acabamos de adicionar o objeto meuListener, e seu papel será ficar de olho no objeto MovieClipLoader meuMVL. Exemplificando, quando a imagem começar a carregar, o ouvinte irá executar a função que foi designada à ele, no caso, ele define o texto em stat_txt para “Start…”.
Creio que agora você já tenha uma idéia do processo todo. Então vamos adicionar mais coisas, começando pelo evento onLoadProgress. Adicione logo abaixo do evento onLoadStart:
Os parâmetros da função são opcionais, “alvo” se refere ao target do método loadClip(“url”, target); portanto, o target no caso é o MovieClip “imagem_mc”. “bLoad” e “bTotal” se referem ao número de bytes carregados e bytes totais em “alvo”.
Existem outros eventos para o ouvinte da classe, mas para esses eu apenas darei uma explicação superficial:
Bom, acho que estão todos por dentro do assunto, então vamos à prática!
Crie um novo filme no Flash (ou use o mesmo de antes, apenas apague as ações contidas nele), e arraste 3 componentes Button para a base do palco, dê a eles nome de instância de “bt1″, “bt2″ e “bt3″ respectivamente. Salve o filme com o nome que desejar, e em seguida crie 3 filmes cada um com um belo e imenso quadrado colorido (ou uma bela e imensa imagem, você escolhe) e salve-os com nomes de “quad1″, “quad2″ e “quad3″, não esqueça de exportar os filmes no Flash Player (Ctrl+Enter) para gerar o arquivo .swf.
Agora, no filme principal (é, lá onde tem os 3 Buttons) abra o painel de ações (F9) e em uma frame vazia digite o seguinte:
Esse é um pequeno exemplo de como carregar arquivos externos (SWF e JPG) no Flash.
Espero que este artigo tenha acrescentado algo a mais em seu conhecimento, e se tiverem qualquer sugestão ou crítica, podem falar que será bem vinda.
Agradeço a atenção e até a próxima!
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