cxgridfilterhelpers.pas

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{       ExpressQuantumGrid                                           }
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unit cxGridFilterHelpers;

{$I cxVer.inc}

interface

uses
  cxGridCustomTableView, cxDataStorage, cxEdit, cxDropDownEdit, cxFilterControlUtils;

type
  { TcxFilterExtLookupComboBoxHelper }

  TcxFilterExtLookupComboBoxHelper = class(TcxFilterComboBoxHelper)
  public
    class function GetFilterEditClass: TcxCustomEditClass; override;
    class function GetSupportedFilterOperators(
      AProperties: TcxCustomEditProperties;
      AValueTypeClass: TcxValueTypeClass;
      AExtendedSet: Boolean = False): TcxFilterControlOperators; override;
    class procedure InitializeProperties(AProperties,
      AEditProperties: TcxCustomEditProperties; AHasButtons: Boolean); override;
  end;

implementation

uses
  cxDBLookupComboBox, cxDBExtLookupComboBox, cxGridDBDataDefinitions,
  cxDBLookupEdit, cxDBData;

{ TcxFilterExtLookupComboBoxHelper }

class function TcxFilterExtLookupComboBoxHelper.GetFilterEditClass: TcxCustomEditClass;
begin
  Result := TcxLookupComboBox;
end;

class function TcxFilterExtLookupComboBoxHelper.GetSupportedFilterOperators(
  AProperties: TcxCustomEditProperties; AValueTypeClass: TcxValueTypeClass;
  AExtendedSet: Boolean = False): TcxFilterControlOperators;
begin
  Result := [fcoEqual, fcoNotEqual, fcoBlanks, fcoNonBlanks];
end;

class procedure TcxFilterExtLookupComboBoxHelper.InitializeProperties(AProperties,
  AEditProperties: TcxCustomEditProperties; AHasButtons: Boolean);
var
  AView: TcxCustomGridTableView;
begin
  inherited InitializeProperties(AProperties, AEditProperties, AHasButtons);
  with TcxLookupComboBoxProperties(AProperties) do
  begin
    DropDownAutoSize := False;
    DropDownListStyle := lsFixedList;
    AView := TcxExtLookupComboBoxProperties(AEditProperties).View;
    if (AView <> nil) and (TcxExtLookupComboBoxProperties(AEditProperties).ListFieldItem <> nil) then
    begin
      ListSource := TcxDBDataController(AView.DataController).DataSource;
      KeyFieldNames := TcxExtLookupComboBoxProperties(AEditProperties).KeyFieldNames;
      ListFieldNames := TcxGridItemDBDataBinding(TcxExtLookupComboBoxProperties(AEditProperties).ListFieldItem.DataBinding).FieldName;
      DropDownSizeable := True;
      IncrementalFiltering := True;
    end;
  end;
end;

initialization
  FilterEditsController.Register(TcxExtLookupComboBoxProperties,
    TcxFilterExtLookupComboBoxHelper);

finalization
  FilterEditsController.Unregister(TcxExtLookupComboBoxProperties,
    TcxFilterExtLookupComboBoxHelper);

end.