1. Introdução aos Applets Vitor Brandi Junior Baseado na lição “Escrevendo Applets” do Java Tutorial
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6. Exemplo Simples import java.awt.Graphics; import java.applet.*; public class TestApplet0 extends Applet { public void paint(Graphics g) { g.drawString("Oi mundo", 5, 50); } }
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11. Exemplo: import java.applet.Applet; import java.awt.Graphics; public class Ciclo extends Applet { public void init() { System.out.println("inicio!"); } public void start() { System.out.println("inicializacao!"); } public void stop() { System.out.println("interrupcao!"); } public void destroy() { System.out.println("destruicao!"); } public void paint(Graphics g) { System.out.println("pintura!"); } }
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16. Exemplo mais completo import java.applet.*; import java.awt.*; public class AnimacaoSimples extends Applet implements Runnable { private Thread animacao; private Image imagens[]; private int frames = 5; private int conta = 0; public void init() { imagens = new Image[frames]; for (int i = 0; i < frames; i++) imagens[i] = getImage(getDocumentBase(), "F5" + i + "AULA3.jpg"); } public void paint(Graphics g) { g.drawImage(imagens[conta++], 1, 1, this); if (conta == frames) conta = 0; }
17. Exemplo mais completo public void start() { if (animacao == null) { animacao = new Thread(this); animacao.start(); } } public void stop() { if (animacao != null){ animacao.stop(); animacao = null; } } public void run() { while (isActive()) { try { repaint(); Thread.sleep(500); } catch (InterruptedException e) {} animacao = null; } } }
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19. Exemplo import java.awt.*; import java.applet.*; public class Circ extends Applet { int xOrig, yOrig; int primVez = 0; public boolean handleEvent(Event e) { if (e.id == Event.MOUSE_DOWN) { Graphics g = getGraphics(); if (primVez == 0) { primVez = 1; xOrig = e.x; yOrig = e.y; } else g.drawLine(xOrig, yOrig, e.x, e.y); xOrig = e.x; yOrig = e.y; return true; } return false; } }
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21. Exemplo de interface import java.awt.*; import java.applet.*; public class GUI extends Applet { Frame janela; public void init() { add(new Button("Abre Janela")); add(new Button("Fecha Janela")); janela = new Frame("Uma Janela PopUp"); janela.resize(250,150); janela.show(); } public boolean action(Event evt, Object arg) { if (evt.target instanceof Button) { String label = (String)arg; if (label.equals("Abre Janela")) { if (!janela.isShowing()) janela.show(); } else if (label.equals("Fecha Janela")) { if (janela.isShowing()) janela.hide(); } } return true; } // metodo action } // classe GUI
22. Outro exemplo de interface import java.awt.*; import java.applet.*; public class d extends Applet { Panel p1,p2,p3,p0; Choice c1,c2; Button b1,b2,b3; TextField t1; public void init() { p1 = new myPanel(new Color(0).red,new FlowLayout(),100,100); Choice c1 = new Choice(); c1.addItem("Option 1"); c1.addItem("Option 2"); p1.add(c1); p2 = new myPanel(new Color(0).blue,new FlowLayout(),100, 100); c2 = new Choice(); c2.addItem("Option A"); c2.addItem("Option B"); c2.addItem("Option C"); p2.add(c2); p3 = new myPanel(new Color(0).black,new FlowLayout(),100, 100); t1 = new TextField(8); t1.setBackground(new Color(0).white); p3.add(t1); p0 = new myPanel(new Color(0).white,new CardLayout(0,0),100,100); setLayout(new FlowLayout()); add(p0); p0.add("First card", p1); p0.add("2nd card", p2); p0.add("3rd card", p3); add(b1 = new Button("card 1")); add(b2 = new Button("card 2")); add(b3 = new Button("card 3")); }
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34. Mais exemplos <APPLET CODE="Animator.class" WIDTH=460 HEIGHT=160 ALT=”Se você rodasse essse applet, estaria vendo uma animação <PARAM NAME="imageSource" VALUE="images/Beans"> <PARAM NAME="backgroundColor" VALUE="0xc0c0c0"> <PARAM NAME="endImage" VALUE=10> <PARAM NAME="soundSource" VALUE="audio"> <PARAM NAME="soundtrack" VALUE="spacemusic.au"> <PARAM NAME="pause" VALUE=200> Seu browser não consegiue entender a tag <APPLET> </APPLET> <HTML> <HEAD> <TITLE>Oi!</TITLE> </HEAD> <BODY> <P> <APPLET CODE="TestApplet3.class" WIDTH=300 HEIGHT=200> <PARAM NAME=nome VALUE="UNIMEP"> Alo para voce !!! </APPLET> </BODY> </HTML>
35. Recuperando parâmetros import java.awt.Graphics; import java.awt.Font; import java.awt.Color; public class TestApplet3 extends java.applet.Applet { Font f = new Font("TimesRoman",Font.BOLD,36); String nome; public void init() { this.nome = getParameter("nome"); if (this.nome == null) this.nome = "Vitor"; this.nome = "Oi " + nome + "!"; } public void paint(Graphics g) { g.setFont(f); g.setColor(Color.red); g.drawString(this.nome, 5, 50); } }
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