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...


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