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PODisabling buttons when a certain variable is zero? [solved: Observer Design Pattern]
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copied!<p>i am creating a simple combat game. there are two opposing players whose objective is to eliminate the other; i have created health bars, and the like. to launch an attack against an opponent, the user clicks a certain button "attack". i want this button to be disabled if one player's healthbar has reached zero. </p> <p><a href="http://sstatic.net/stackoverflow/img/Untitled.jpg" rel="nofollow noreferrer">frame http://sstatic.net/stackoverflow/img/Untitled.jpg</a></p> <p>The structure of my program:</p> <p>main class (public class App extends JFrame) //private JButtons, JPanels, etc.</p> <p>public App() //layout of all components and registered listeners</p> <p>main method //frame/s (i have more than one frame in my main method. haha)</p> <p>Listener class/es //if else statements (if (e.getSource == xyz))</p> <p>JPanel class/es that draws health bars</p> <p>----end of structure</p> <p>here's what i've done so far on the panel class(the total source code is an 800-line txt file):</p> <pre><code> class HP2panel extends JPanel { public void damageTake() { if (widthHP <= 0) { damageToMe = 0; } else if (widthRage >= 250) { damageToMe = 175 + (int)(Math.random() * 25); } else if (widthHP > 0 && widthRage < 250) { damageToMe = Math.round(1 + (int)(Math.random() * 15)); } if (widthHP2 <= 0) { damageToMe = 0; } widthHP2 = widthHP2 - damageToMe; logtxt.append("\nYour HP: " + widthHP2); logtxt.append("\nDamage you've taken: " + damageToMe); repaint(); } public void healdamageTake() { if (widthHP2 <= 0) { Heal = 0; } if (widthHP2 >= 250) { Heal = 0; } else { Heal = (int)(Math.random() * 25); } widthHP2 = widthHP2 + Heal; logtxt.append("\n"); logtxt.append("\nHealed HP: " + Heal); repaint(); } public void restartHP2() { widthHP2 = 250; repaint(); } @Override protected void paintComponent(Graphics g) { super.paintComponent(g); g.setColor(Color.green); g.fillRect(0, 0, widthHP2, 16); } } </code></pre> <p>HP2panel is the panel class in which the healthbar(fillRect) of player 2 is drawn. widthHP, widthRage are params from other panel class i've made.</p> <p>i want the attack button disabled once widthHP goes zero or less than. i've worked on if statements but it seemed useless.</p> <p>i don't know whether i'm gonna put it on my Listener class or wherever else in my code.</p>

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