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(function($){
 $.extend($.fn.datagrid.defaults, {
  clickToEdit: true,
  dblclickToEdit: false,
  navHandler: {
   '37': function(e){
    var opts = $(this).datagrid('options');
    return navHandler.call(this, e, opts.isRtl?'right':'left');
   },
   '39': function(e){
    var opts = $(this).datagrid('options');
    return navHandler.call(this, e, opts.isRtl?'left':'right');
   },
   '38': function(e){
    return navHandler.call(this, e, 'up');
   },
   '40': function(e){
    return navHandler.call(this, e, 'down');
   },
   '13': function(e){
    return enterHandler.call(this, e);
   },
   '27': function(e){
    return escHandler.call(this, e);
   },
   '8': function(e){
    return clearHandler.call(this, e);
   },
   '46': function(e){
    return clearHandler.call(this, e);
   },
   'keypress': function(e){
    if (e.metaKey || e.ctrlKey){
     return;
    }
    var dg = $(this);
    var param = dg.datagrid('cell'); // current cell information
    if (!param){return;}
    var input = dg.datagrid('input', param);
    if (!input){
     var tmp = $('<span></span>');
     tmp.html(String.fromCharCode(e.which));
     var c = tmp.text();
     tmp.remove();
     if (c){
      dg.datagrid('editCell', {
       index: param.index,
       field: param.field,
       value: c
      });
      return false;     
     }
    }
   }
  },
  onBeforeCellEdit: function(index, field){},
  onCellEdit: function(index, field, value){
   var input = $(this).datagrid('input', {index:index, field:field});
   if (input){
    if (value != undefined){
     input.val(value);
    }
   }
  },
  onSelectCell: function(index, field){},
  onUnselectCell: function(index, field){}
 });

 function navHandler(e, dir){
  var dg = $(this);
  var param = dg.datagrid('cell');
  var input = dg.datagrid('input', param);
  if (!input){
   dg.datagrid('gotoCell', dir);
   return false;
  }
 }

 function enterHandler(e){
  var dg = $(this);
  var cell = dg.datagrid('cell');
  if (!cell){return;}
  var input = dg.datagrid('input', cell);
  if (input){
   endCellEdit(this, true);
  } else {
   dg.datagrid('editCell', cell);
  }
  return false;
 }

 function escHandler(e){
  endCellEdit(this, false);
  return false;
 }

 function clearHandler(e){
  var dg = $(this);
  var param = dg.datagrid('cell');
  if (!param){return;}
  var input = dg.datagrid('input', param);
  if (!input){
   dg.datagrid('editCell', {
    index: param.index,
    field: param.field,
    value: ''
   });
   return false;
  }  
 }

 function getCurrCell(target){
  var cell = $(target).datagrid('getPanel').find('td.datagrid-row-selected');
  if (cell.length){
   return {
    index: parseInt(cell.closest('tr.datagrid-row').attr('datagrid-row-index')),
    field: cell.attr('field')
   };
  } else {
   return null;
  }
 }

 function unselectCell(target, p){
  var opts = $(target).datagrid('options');
  var cell = opts.finder.getTr(target, p.index).find('td[field="'+p.field+'"]');
  cell.removeClass('datagrid-row-selected');
  opts.onUnselectCell.call(target, p.index, p.field);
 }

 function unselectAllCells(target){
  var panel = $(target).datagrid('getPanel');
  panel.find('td.datagrid-row-selected').removeClass('datagrid-row-selected');
 }

 function selectCell(target, p){
  var opts = $(target).datagrid('options');
  if (opts.singleSelect){
   unselectAllCells(target);
  }
  var cell = opts.finder.getTr(target, p.index).find('td[field="'+p.field+'"]');
  cell.addClass('datagrid-row-selected');
  opts.onSelectCell.call(target, p.index, p.field);
 }

 function getSelectedCells(target){
  var cells = [];
  var panel = $(target).datagrid('getPanel');
  panel.find('td.datagrid-row-selected').each(function(){
   var td = $(this);
   cells.push({
    index: parseInt(td.closest('tr.datagrid-row').attr('datagrid-row-index')),
    field: td.attr('field'),
    value: td.context.outerText
   });
  });
  return cells;
 }

 function gotoCell(target, p){
  var dg = $(target);
  var opts = dg.datagrid('options');
  var panel = dg.datagrid('getPanel').focus();

  var cparam = dg.datagrid('cell');
  if (cparam){
   var input = dg.datagrid('input', cparam);
   if (input){
    input.focus();
    return;
   }
  }

  if (typeof p == 'object'){
   _go(p);
   return;
  }
  var cell = panel.find('td.datagrid-row-selected');
  if (!cell){return;}
  var fields = dg.datagrid('getColumnFields',true).concat(dg.datagrid('getColumnFields'));
  var field = cell.attr('field');
  var tr = cell.closest('tr.datagrid-row');
  var rowIndex = parseInt(tr.attr('datagrid-row-index'));
  var colIndex = $.inArray(field, fields);

  if (p == 'up' && rowIndex > 0){
   rowIndex--;
  } else if (p == 'down'){
   if (opts.finder.getRow(target, rowIndex+1)){
    rowIndex++;
   }
  } else if (p == 'left'){
   var i = colIndex - 1;
   while(i >= 0){
    var col = dg.datagrid('getColumnOption', fields[i]);
    if (!col.hidden){
     colIndex = i;
     break;
    }
    i--;
   }
  } else if (p == 'right'){
   var i = colIndex + 1;
   while(i <= fields.length-1){
    var col = dg.datagrid('getColumnOption', fields[i]);
    if (!col.hidden){
     colIndex = i;
     break;
    }
    i++;
   }
  }

  field = fields[colIndex];

  _go({index:rowIndex, field:field});

  function _go(p){
   dg.datagrid('scrollTo', p.index);
   unselectAllCells(target);
   selectCell(target, p);
   var td = opts.finder.getTr(target, p.index, 'body', 2).find('td[field="'+p.field+'"]');
   if (td.length){
    var body2 = dg.data('datagrid').dc.body2;
    var left = td.position().left;
    if (left < 0){
     body2._scrollLeft(body2._scrollLeft() + left*(opts.isRtl?-1:1));
    } else if (left+td._outerWidth()>body2.width()){
     body2._scrollLeft(body2._scrollLeft() + (left+td._outerWidth()-body2.width())*(opts.isRtl?-1:1));
    }
   }
  }
 }

 // end the current cell editing
 function endCellEdit(target, accepted){
  var dg = $(target);
  var cell = dg.datagrid('cell');
  if (cell){
   var input = dg.datagrid('input', cell);
   if (input){
    if (accepted){
     if (dg.datagrid('validateRow', cell.index)){
      dg.datagrid('endEdit', cell.index);
      dg.datagrid('gotoCell', cell);
     } else {
      dg.datagrid('gotoCell', cell);
      input.focus();
      return false;
     }
    } else {
     dg.datagrid('cancelEdit', cell.index);
     dg.datagrid('gotoCell', cell);
    }
   }
  }
  return true;
 }

 function editCell(target, param){
  var dg = $(target);
  var opts = dg.datagrid('options');
  var input = dg.datagrid('input', param);
  if (input){
   dg.datagrid('gotoCell', param);
   input.focus();
   return;
  }
  if (!endCellEdit(target, true)){return;}
  if (opts.onBeforeCellEdit.call(target, param.index, param.field) == false){
   return;
  }

  var fields = dg.datagrid('getColumnFields',true).concat(dg.datagrid('getColumnFields'));
  $.map(fields, function(field){
   var col = dg.datagrid('getColumnOption', field);
   col.editor1 = col.editor;
   if (field != param.field){
    col.editor = null;
   }
  });

  var col = dg.datagrid('getColumnOption', param.field);
  if (col.editor){
   dg.datagrid('beginEdit', param.index);
   var input = dg.datagrid('input', param);
   if (input){
    dg.datagrid('gotoCell', param);
    setTimeout(function(){
     input.unbind('.cellediting').bind('keydown.cellediting', function(e){
      if (e.keyCode == 13){
       opts.navHandler['13'].call(target, e);
       return false;
      }
     });
     input.focus();
    }, 0);
    opts.onCellEdit.call(target, param.index, param.field, param.value);
   } else {
    dg.datagrid('cancelEdit', param.index);
    dg.datagrid('gotoCell', param);
   }
  } else {
   dg.datagrid('gotoCell', param);
  }

  $.map(fields, function(field){
   var col = dg.datagrid('getColumnOption', field);
   col.editor = col.editor1;
  });
 }

 function enableCellSelecting(target){
  var dg = $(target);
  var state = dg.data('datagrid');
  var panel = dg.datagrid('getPanel');
  var opts = state.options;
  var dc = state.dc;
  panel.attr('tabindex',1).css('outline-style','none').unbind('.cellediting').bind('keydown.cellediting', function(e){
   var h = opts.navHandler[e.keyCode];
   if (h){
    return h.call(target, e);
   }
  });
  dc.body1.add(dc.body2).unbind('.cellediting').bind('click.cellediting', function(e){
   var tr = $(e.target).closest('.datagrid-row');
   if (tr.length && tr.parent().length){
    var td = $(e.target).closest('td[field]', tr);
    if (td.length){
     var index = parseInt(tr.attr('datagrid-row-index'));
     var field = td.attr('field');
     var p = {
      index: index,
      field: field
     };
     if (opts.singleSelect){
      selectCell(target, p);
     } else {
      if (opts.ctrlSelect){
       if (e.ctrlKey){
        if (td.hasClass('datagrid-row-selected')){
         unselectCell(target, p);
        } else {
         selectCell(target, p);
        }
       } else {
        unselectAllCells(target);
        selectCell(target, p);
       }
      } else {
       if (td.hasClass('datagrid-row-selected')){
        unselectCell(target, p);
       } else {
        selectCell(target, p);
       }
      }
     }
    }
   }
  }).bind('mouseover.cellediting', function(e){
   var td = $(e.target).closest('td[field]');
   if (td.length){
    td.addClass('datagrid-row-over');
    td.closest('tr.datagrid-row').removeClass('datagrid-row-over');
   }
  }).bind('mouseout.cellediting', function(e){
   var td = $(e.target).closest('td[field]');
   td.removeClass('datagrid-row-over');
  });

  opts.isRtl = dg.datagrid('getPanel').css('direction').toLowerCase()=='rtl';
  opts.OldOnBeforeSelect = opts.onBeforeSelect;
  opts.onBeforeSelect = function(){
   return false;
  };
  dg.datagrid('clearSelections');
 }

 function disableCellSelecting(target){
  var dg = $(target);
  var state = dg.data('datagrid');
  var panel = dg.datagrid('getPanel');
  var opts = state.options;
  opts.onBeforeSelect = opts.OldOnBeforeSelect || opts.onBeforeSelect;
  panel.unbind('.cellediting').find('td.datagrid-row-selected').removeClass('datagrid-row-selected');
  var dc = state.dc;
  dc.body1.add(dc.body2).unbind('cellediting');
 }

 function enableCellEditing(target){
  var dg = $(target);
  var opts = dg.datagrid('options');
  var panel = dg.datagrid('getPanel');
  panel.attr('tabindex',1).css('outline-style','none').unbind('.cellediting').bind('keydown.cellediting', function(e){
   var h = opts.navHandler[e.keyCode];
   if (h){
    return h.call(target, e);
   }
  }).bind('keypress.cellediting', function(e){
   return opts.navHandler['keypress'].call(target, e);
  });
  panel.panel('panel').unbind('.cellediting').bind('keydown.cellediting', function(e){
   e.stopPropagation();
  }).bind('keypress.cellediting', function(e){
   e.stopPropagation();
  }).bind('mouseover.cellediting', function(e){
   var td = $(e.target).closest('td[field]');
   if (td.length){
    td.addClass('datagrid-row-over');
    td.closest('tr.datagrid-row').removeClass('datagrid-row-over');
   }
  }).bind('mouseout.cellediting', function(e){
   var td = $(e.target).closest('td[field]');
   td.removeClass('datagrid-row-over');
  });

  opts.isRtl = dg.datagrid('getPanel').css('direction').toLowerCase()=='rtl';
  opts.oldOnClickCell = opts.onClickCell;
  opts.oldOnDblClickCell = opts.onDblClickCell;
  opts.onClickCell = function(index, field, value){
   if (opts.clickToEdit){
    $(this).datagrid('editCell', {index:index,field:field});
   } else {
    if (endCellEdit(this, true)){
     $(this).datagrid('gotoCell', {
      index: index,
      field: field
     });
    }
   }
   opts.oldOnClickCell.call(this, index, field, value);
  }
  if (opts.dblclickToEdit){
   opts.onDblClickCell = function(index, field, value){
    $(this).datagrid('editCell', {index:index,field:field});
    opts.oldOnDblClickCell.call(this, index, field, value);
   }
  }
  opts.OldOnBeforeSelect = opts.onBeforeSelect;
  opts.onBeforeSelect = function(){
   return false;
  };
  dg.datagrid('clearSelections')
 }

 function disableCellEditing(target){
  var dg = $(target);
  var panel = dg.datagrid('getPanel');
  var opts = dg.datagrid('options');
  opts.onClickCell = opts.oldOnClickCell || opts.onClickCell;
  opts.onDblClickCell = opts.oldOnDblClickCell || opts.onDblClickCell;
  opts.onBeforeSelect = opts.OldOnBeforeSelect || opts.onBeforeSelect;
  panel.unbind('.cellediting').find('td.datagrid-row-selected').removeClass('datagrid-row-selected');
  panel.panel('panel').unbind('.cellediting');
 }

 $.extend($.fn.datagrid.methods, {
  editCell: function(jq, param){
   return jq.each(function(){
    editCell(this, param);
   });
  },
  isEditing: function(jq, index){
   var opts = $.data(jq[0], 'datagrid').options;
   var tr = opts.finder.getTr(jq[0], index);
   return tr.length && tr.hasClass('datagrid-row-editing');
  },
  gotoCell: function(jq, param){
   return jq.each(function(){
    gotoCell(this, param);
   });
  },
  enableCellEditing: function(jq){
   return jq.each(function(){
    enableCellEditing(this);
   });
  },
  disableCellEditing: function(jq){
   return jq.each(function(){
    disableCellEditing(this);
   });
  },
  enableCellSelecting: function(jq){
   return jq.each(function(){
    enableCellSelecting(this);
   });
  },
  disableCellSelecting: function(jq){
   return jq.each(function(){
    disableCellSelecting(this);
   });
  },
  input: function(jq, param){
   if (!param){return null;}
   var ed = jq.datagrid('getEditor', param);
   if (ed){
    var t = $(ed.target);
    if (t.hasClass('textbox-f')){
     t = t.textbox('textbox');
    }
    return t;
   } else {
    return null;
   }
  },
  cell: function(jq){  // get current cell info {index,field}
   return getCurrCell(jq[0]);
  },
  getSelectedCells: function(jq){
   return getSelectedCells(jq[0]);
  }
 });

})(jQuery);