java - How to create a JTable cell with scrollable content -

i'd use jtable display data. data can little larger, neccessary able scroll inside cells of jtable.

i try accomplish code below. table created looks fine, unfortunatly doesn't work. scrollbar doens't seem respond mouse clicks.

how can without scrollbars "freezing" ?

thanks,

thorsten

package main;  import java.awt.borderlayout;  import javax.swing.jframe; import javax.swing.jpanel; import javax.swing.jscrollpane; import javax.swing.jtable;  public class scrollablecelltabletest extends jpanel {      jtable table;     string val = "this totally cool test data. ";       public scrollablecelltabletest() {          setlayout(new borderlayout());          (int t=0; t<10; t++)             val+=val;          table = new jtable(new string[][]{{val}}, new string[]{"colname"}) {             public boolean iscelleditable(int row, int column) {                 return false;             }         };          table.getcolumnmodel().getcolumn(0)                 .setcellrenderer(new scrollablecellrenderer());          add(new jscrollpane(table), borderlayout.center);      }      public static void main(string[] args) {         jframe frame = new jframe();         scrollablecelltabletest scrollablecelltable = new scrollablecelltabletest();         frame.getcontentpane().setlayout(new borderlayout());         frame.getcontentpane().add(scrollablecelltable, borderlayout.center);         frame.pack();         frame.setlocation(500, 300);         frame.setdefaultcloseoperation(jframe.exit_on_close);         frame.setvisible(true);     }  } 

the cell renderer class:

package main;  import java.awt.borderlayout; import java.awt.component; import java.awt.dimension; import java.util.arraylist; import java.util.list;  import javax.swing.jpanel; import javax.swing.jscrollpane; import javax.swing.jtable; import javax.swing.jtextarea; import javax.swing.table.tablecellrenderer;  /**  * scrollable cell renderer.  */ public class scrollablecellrenderer extends jpanel implements         tablecellrenderer {     private list rowcolheight = new arraylist();     jscrollpane jscrollpane;     jtextarea textarea = new jtextarea();      public scrollablecellrenderer() {         textarea.setlinewrap(true);         textarea.setwrapstyleword(true);          setlayout(new borderlayout());         add(textarea, borderlayout.center);         jscrollpane = new jscrollpane(this);     }      public component gettablecellrenderercomponent(jtable table, object value,             boolean isselected, boolean hasfocus, int row, int column) {          textarea.settext(value.tostring());          adjustrowheight(table, row, column);          return new jscrollpane(this);     }      /**      * calculate new preferred height given row, , sets height      * on table.      */     private void adjustrowheight(jtable table, int row, int column) {          int cwidth = table.gettableheader().getcolumnmodel().getcolumn(column)                 .getwidth();         setsize(new dimension(cwidth, 1000));         int prefh = getpreferredsize().height;          // limit height, scrollbars become neccessary         prefh = math.min(prefh, 100);           while (rowcolheight.size() <= row) {             rowcolheight.add(new arraylist(column));         }         list colheights = (list) rowcolheight.get(row);         while (colheights.size() <= column) {             colheights.add(new integer(0));         }         colheights.set(column, new integer(prefh));         int maxh = prefh;         (int t = 0; t < colheights.size(); t++) {             int colheight = ((integer) colheights.get(t)).intvalue();             if (colheight > maxh)                 maxh = colheight;         }         if (table.getrowheight(row) != maxh) {             table.setrowheight(row, maxh);         }      } } 

your approach never work because renderer used render cell content. no interaction renderer possible. can provide interaction cell content using editor. unfortunately can have 1 editor @ same time. way provide scrolling in actual cell install mouse listener makes pointed cell editable (probably little delay). in listener must monitor following events: moving (make cell @ point editable), entering (same moving) , exiting (remove current editor if exists). approach work without listener: interface celleditor defines method iscelleditable(eventobject anevent). here should try check whether event mouse event , id entering, moving or exiting. , don't forget define appropriate cells editable in table model!