java - Dealing with a DragGestureRecognizer when it is no longer needed -


how deal draggesturerecognizer when no longer needed?

i'm using dragsource.getdefaultdragsource().createdefaultdraggesturerecognizer() make sure custom draggesturelistener receives drag , drop events on jtable:

draggesturelistener dgl = new defaultdragtoreordertablegesturelistener(getview().gettrackstable()); draggesturerecognizer dgr = dragsource.getdefaultdragsource().createdefaultdraggesturerecognizer(getview().gettrackstable(), dndconstants.action_move, dgl);

this works well. however, need remove draggesturelistener @ point revert dnd behaviour default. assume question of unregistering draggesturelistener draggesturerecognizer.

but; do draggesturerecognizer? still registered system, can't find way unregister it? how deal draggesturerecognizer?

package com.tracker.workspace.ui.views.test;  import java.awt.dnd.dndconstants; import java.awt.dnd.draggestureevent; import java.awt.dnd.draggesturelistener; import java.awt.dnd.draggesturerecognizer; import java.awt.dnd.dragsource; import java.awt.event.actionevent; import javax.swing.abstractaction; import javax.swing.dropmode; import javax.swing.jbutton; import javax.swing.listselectionmodel; import javax.swing.transferhandler; import javax.swing.uimanager; import javax.swing.table.defaulttablemodel;  public class testframe extends javax.swing.jframe {      private boolean ordering = false;      /** creates new form testframe */     public testframe() {         initcomponents();          this.button.setaction(new orderaction(ordering));          this.table.setmodel(new defaulttablemodel() {              @override             public int getrowcount() {                 return 5;             }              @override             public int getcolumncount() {                 return 1;             }              @override             public object getvalueat(int r, int c) {                 return r;             }            });     }      /** method called within constructor      * initialize form.      * warning: not modify code. content of method      * regenerated form editor.      */     @suppresswarnings("unchecked")     // <editor-fold defaultstate="collapsed" desc="generated code">                               private void initcomponents() {          scrollpane = new javax.swing.jscrollpane();         table = new javax.swing.jtable();         button = new javax.swing.jbutton();          setdefaultcloseoperation(javax.swing.windowconstants.exit_on_close);          table.setmodel(new javax.swing.table.defaulttablemodel(             new object [][] {                 {null, null, null, null},                 {null, null, null, null},                 {null, null, null, null},                 {null, null, null, null}             },             new string [] {                 "title 1", "title 2", "title 3", "title 4"             }         ));         scrollpane.setviewportview(table);          button.settext("jbutton1");          javax.swing.grouplayout layout = new javax.swing.grouplayout(getcontentpane());         getcontentpane().setlayout(layout);         layout.sethorizontalgroup(             layout.createparallelgroup(javax.swing.grouplayout.alignment.leading)             .addgroup(layout.createsequentialgroup()                 .addcontainergap()                 .addgroup(layout.createparallelgroup(javax.swing.grouplayout.alignment.leading)                     .addcomponent(scrollpane, javax.swing.grouplayout.default_size, 634, short.max_value)                     .addcomponent(button, javax.swing.grouplayout.preferred_size, 125, javax.swing.grouplayout.preferred_size))                 .addcontainergap())         );         layout.setverticalgroup(             layout.createparallelgroup(javax.swing.grouplayout.alignment.leading)             .addgroup(layout.createsequentialgroup()                 .addcontainergap()                 .addcomponent(button)                 .addpreferredgap(javax.swing.layoutstyle.componentplacement.related)                 .addcomponent(scrollpane, javax.swing.grouplayout.default_size, 478, short.max_value)                 .addcontainergap())         );          pack();     }// </editor-fold>                              /**     * @param args command line arguments     */     public static void main(string args[]) {         java.awt.eventqueue.invokelater(new runnable() {             public void run() {                  // start application.                 try {                     uimanager.setlookandfeel(uimanager.getsystemlookandfeelclassname());                     new testframe().setvisible(true);                  } catch (exception e) {                     e.printstacktrace();                 }               }         });     }      // variables declaration - not modify                          private javax.swing.jbutton button;     private javax.swing.jscrollpane scrollpane;     private javax.swing.jtable table;     // end of variables declaration                         public class orderaction extends abstractaction {          private draggesturerecognizer dgr;         private draggesturelistener dgl;          public orderaction(boolean ordering) {             super(ordering ? "ordering" : "not ordering");         }          public void actionperformed(actionevent ae) {             ordering = !ordering;              jbutton b = (jbutton) ae.getsource();             b.settext(ordering ? "ordering" : "not ordering");               if (ordering) {                  dgl = new draggesturelistener() {                     public void draggesturerecognized(draggestureevent dge) {                         // implementation og gesture listener goes here.                     }                 };                  dgr = dragsource.getdefaultdragsource().createdefaultdraggesturerecognizer(table, dndconstants.action_move, dgl);                  table.setselectionmode(listselectionmodel.single_selection);                 table.setdragenabled(true);                 table.setdropmode(dropmode.insert_rows);                 table.settransferhandler(new transferhandler() {                     // implementation of transferhandler goes here.                 });              } else {                 dgr.removedraggesturelistener(dgl);                  // assume draggesturelistener still, somehow, registered                 // system. how remove "traces" of it?                 system.out.println("the draggesturelistener still around...")              }         }      }  }

you start unregistering it's listeners

dgr.removedraggesturelistener(dgl)

and try dgr.setcomponent(null). automatically unregister associated listeners...


Comments

Post a Comment

Popular posts from this blog

php - cannot display multiple markers in google maps v3 from traceroute result -

i'm newbie in php mysql , google maps v3. have problems in google maps v3. made traceroute web based , map traceroute's result in google maps v3 final project of college education. have try many tutorials didn't work. have tried tutorials in forum nothing worked. problem cannot display multiple markers got location data database. maybe because i'm newbie , not know how do. confuse looping show markers. here code <?php error_reporting(e_all ^ (e_notice)); ini_set('max_execution_time', 360); $enable_log_user = false; global $ip, $host_name, $host_ip; $host = @$_post['host']; $trace = @$_post['trace']; $self = $_server['php_self']; include("phpsqlajax_dbinfo.php"); $connection = mysql_connect ('127.0.0.1', $username, $password); if (!$connection) { die('not connected : ' . mysql_error());} $db_selected = mysql_select_db($database, $connection); if (!$db_selected) { die ('can\'t use db : ...
Read more

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