java - KeyListener wont focus -


i'm new java please forgive me asking help, after 4 hours of searching solution i'm getting desperate.

i'm setting game , want implement key controls. tried via keylistener , keyeventdispatcher can't work. keylistener won't react. think method supposed use has focus.

here's code:

public class sins extends jframe implements keyeventdispatcher  {   public boolean dispatchkeyevent(keyevent e) {      if (e.getid() == keyevent.key_pressed ) {          if(keyevent.vk_up == e.getid()){              system.exit(0);           }       } else if (e.getid() == keyevent.key_released) {            if(keyevent.vk_up == e.getid()){              system.exit(0);             }      } else if (e.getid() == keyevent.key_typed) {            if(keyevent.vk_up == e.getid()){              system.exit(0);             }      }      return false;  }

and here method supposed working at:

  public void run() {     setfocusable(true);      backgroundgraphics = (graphics2d) background.getgraphics();   long fpswait = (long) (1.0 / 30 * 1000);    requestfocusinwindow();  main: while (isrunning==true) {     long renderstart = system.nanotime();      keyboardfocusmanager manager = keyboardfocusmanager.getcurrentkeyboardfocusmanager();     manager.addkeyeventdispatcher(this);      x++;     requestfocusinwindow();      // update graphics     {         graphics2d bg = getbuffer();          if (isrunning == false) {             break main;         }         rendergame(backgroundgraphics); // calls draw method          if (scale != 1) {             bg.drawimage(background, 0, 0, width * scale, height                     * scale, 0, 0, width, height, null);         } else {             bg.drawimage(background, 0, 0, null);         }         bg.dispose();          requestfocusinwindow();           this.requestfocus();          if(x ==5000){             isrunning=false;         }      } while (!updatescreen());      // better fps limiting here     long rendertime = (system.nanotime() - renderstart) / 10000;     try {         thread.sleep(math.max(0, fpswait - rendertime));     } catch (interruptedexception e) {         thread.interrupted();         break;     }       rendertime = (system.nanotime() - renderstart) / 10000;     }     this.dispose();    system.exit(0); }

the program closing after counting 5000. test purposes i'm trying close via button won't close way. appreciate help, said i'm new java.

the first problem facing keylistener know , documented (here on especially). keylistener on respond if component attached focusable , has keyboard focus. think of text field, when doesn't have focus, won't update.

your second problem using keyboardfocusmanager, overkill problem.

instead, should make use of [key bindings] api, simpler having monitor keyboardfocusmanager , more robust keylisteners


Comments

Post a Comment

Popular posts from this blog

c# - DetailsView in ASP.Net - How to add another column on the side/add a control in each row? -

i have detailsview control on page used edit various fields of record, works in respect. i looking way add 1 column (and if works, why not more) right, absolutely read-only, show same fields of record comparison purposes. i aware there no obvious way such thing out of box detailsview . have looked other controls (transposed gridview , recommended formview , listview ), nothing satisfies. have special data binding setup using detailsview , can't out of without losing features. anyone on how "hack in" additional columns (for display only) on detailsview ? the solution have now, use second detailsview , visible set false in aspx. in code, make sure databind hidden detailsview hosts data third column first, initial detailsview named itemdetails . and in item created event, pass third column html rendering of hidden controls (in last code block) : protected void itemdetails_itemcreated(object sender, eventargs e) { if (dataite
Read more

javascript - firefox memory leak -

i have following script (i use raphaeljs also) draws circle, waits 1 second, draws circle again, etc (you can copy paste - functional, need include raphael raphaeljs.com): <div id="holder"> </div> <script src="raphael.js" type="text/javascript"></script> <script> var paper = raphael(10, 50, 320, 200); var rad = math.pi / 180; var finangle = 0; function sector(cx, cy, r, startangle, endangle, params) { var x1 = cx + r * math.cos(-startangle * rad), x2 = cx + r * math.cos(-endangle * rad), y1 = cy + r * math.sin(-startangle * rad), y2 = cy + r * math.sin(-endangle * rad); return ["m", cx, cy, "l", x1, y1, "a", r, r, 0, +(endangle - startangle > 180), 0, x2, y2]; } var path = sector(100,100,50,0,180); var arc = paper.path(path); function draw() { path = sector(100,100,50,0,finangle);
Read more

Trying to import CSV file to a SQL Server database using asp.net and c# - can't find what I'm missing -

i student , quite new programming, , given task using asp.net , c#, without being taught either. plan learn teach ourselves. the task stuck on making website import csv file sql server database of last year's room bookings around campus. the table has following columns: request_id; priority; module_id; day; start_time; length; park; students; room_code; status; semester_id; linked_request; week_1; week_2; week_3; week_4; week_5; week_6; week_7; week_8; week_9; week_10; week_11; week_12; week_13; week_14; week_15; ) in code, try make work 3 columns (request_id,priority,module) starters. when press import button, want read .csv file (with fixed name @ fixed directory) eg "1,2,3" - comma separating fields [delimiter] - , import sql server datab
Read more