java - Event Listeners on Dynamic Buttons -
i've been struggling while, i'm trying build program makes use of mvc pattern, dynamically creates grid of buttons (nxn) based on user input. can't right attach listeners them.
edit: meant wanted handle event inside of controller class conform mvc pattern
view
public class aigameview extends javax.swing.jframe { private aigamemodel model; private jbutton[][] btn_arr; public aigameview(aigamemodel m) { model = m; initcomponents(); } @suppresswarnings("unchecked") // <editor-fold defaultstate="collapsed" desc="generated code"> private void initcomponents() {...} private void startbtnactionperformed(java.awt.event.actionevent evt) { options.setvisible(false); int size = integer.parseint(size_field.gettext()); model.setsize(size); btn_arr = new jbutton[size][size]; gamegui.setlayout(new java.awt.gridlayout(size, size)); for(int y = 0; y < size; y++) { for(int x = 0; x < size; x++) { btn_arr[y][x] = new jbutton(); btn_arr[y][x].setbackground(color.white); gamegui.add(btn_arr[y][x]); btn_arr[y][x].setvisible(true); } } gamegui.setvisible(true); gamegui.revalidate(); gamegui.repaint(); } controller
public class aigamecontroller { private aigameview view; private aigamemodel model; private jbutton[][] buttons; public aigamecontroller(aigamemodel m, aigameview v) { view = v; model = m; } i've tried several things, nothing seems work , end null pointer exception. advice on ?
from code posted far, seems add call
btn_arr[y][x] = new jbutton(); btn_arr[y][x].addactionlistener(createactionlistener(y, x)); ... with method like
private actionlistener createactionlistener(final int y, final int x) { return new actionlistener() { @override public void actionperformed(actionevent e) { system.out.println("clicked "+y+" "+x); // method should called in // response button click: clickedbutton(y,x); } }; } private void clickedbutton(int y, int x) { // whatever has done now... }
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