cxgriddbtableview.pas

来自「胜天进销存源码,国产优秀的进销存」· PAS 代码 · 共 290 行

{********************************************************************}
{                                                                    }
{       Developer Express Visual Component Library                   }
{       ExpressQuantumGrid                                           }
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unit cxGridDBTableView;

{$I cxVer.inc}

interface

uses
  Classes, cxGridCustomTableView, cxGridTableView, cxGridDBDataDefinitions,
  cxStorage, cxCustomData, cxDBData;

type
  TcxGridDBTableView = class;

  TcxGridDBColumn = class(TcxGridColumn)
  private
    function GetDataBinding: TcxGridItemDBDataBinding;
    procedure SetDataBinding(Value: TcxGridItemDBDataBinding);
  published
    property DataBinding: TcxGridItemDBDataBinding read GetDataBinding write SetDataBinding;
  end;

  TcxGridDBTableSummaryItem = class(TcxDBDataSummaryItem,
    {$IFNDEF DELPHI6}IUnknown,{$ENDIF} IcxStoredObject, IcxGridSummaryItem)
  private
    FDisplayText: string;
    FVisibleForCustomization: Boolean;
    function GetColumn: TcxGridColumn;
    function GetGridView: TcxGridTableView;
    procedure SetColumn(Value: TcxGridColumn);
    procedure SetDisplayText(const Value: string);
    procedure SetVisibleForCustomization(Value: Boolean);
  protected
    // IInterface
    function QueryInterface(const IID: TGUID; out Obj): HResult; stdcall;
    function _AddRef: Integer; stdcall;
    function _Release: Integer; stdcall;
    // IcxStoredObject
    function GetObjectName: string;
    function GetProperties(AProperties: TStrings): Boolean;
    procedure GetPropertyValue(const AName: string; var AValue: Variant);
    procedure SetPropertyValue(const AName: string; const AValue: Variant);
    // IcxGridSummaryItem
    function GetDisplayText: string;
    function GetVisibleForCustomization: Boolean;

    property GridView: TcxGridTableView read GetGridView;
  public
    constructor Create(Collection: TCollection); override;
    procedure Assign(Source: TPersistent); override;
  published
    property Column: TcxGridColumn read GetColumn write SetColumn;
    property DisplayText: string read FDisplayText write SetDisplayText;  
    property Sorted;
    property VisibleForCustomization: Boolean read FVisibleForCustomization
      write SetVisibleForCustomization default True;
  end;

  TcxGridDBTableView = class(TcxGridTableView)
  private
    function GetColumn(Index: Integer): TcxGridDBColumn;
    function GetDataController: TcxGridDBDataController;
    procedure SetColumn(Index: Integer; Value: TcxGridDBColumn);
    procedure SetDataController(Value: TcxGridDBDataController);
  protected
    function GetDataControllerClass: TcxCustomDataControllerClass; override;
    function GetItemClass: TcxCustomGridTableItemClass; override;
    function GetSummaryItemClass: TcxDataSummaryItemClass; override;
  public
    function CreateColumn: TcxGridDBColumn;
    function GetColumnByFieldName(const AFieldName: string): TcxGridDBColumn;
    property Columns[Index: Integer]: TcxGridDBColumn read GetColumn write SetColumn;
  published
    property DataController: TcxGridDBDataController read GetDataController write SetDataController;
  end;

implementation

uses
  cxGridCustomView;

{ TcxGridDBColumn }

function TcxGridDBColumn.GetDataBinding: TcxGridItemDBDataBinding;
begin
  Result := TcxGridItemDBDataBinding(inherited DataBinding);
end;

procedure TcxGridDBColumn.SetDataBinding(Value: TcxGridItemDBDataBinding);
begin
  inherited DataBinding := Value;
end;

{ TcxGridDBTableSummaryItem }

constructor TcxGridDBTableSummaryItem.Create(Collection: TCollection);
begin
  inherited;
  FVisibleForCustomization := True;
end;

function TcxGridDBTableSummaryItem.GetColumn: TcxGridColumn;
begin
  Result := TcxGridColumn(ItemLink);
end;

function TcxGridDBTableSummaryItem.GetGridView: TcxGridTableView;
begin
  Result := TcxGridTableView(TcxGridDBDataController(DataController).GridView);
end;

procedure TcxGridDBTableSummaryItem.SetColumn(Value: TcxGridColumn);
begin
  ItemLink := Value;
end;

procedure TcxGridDBTableSummaryItem.SetDisplayText(const Value: string);
begin
  if FDisplayText <> Value then
  begin
    FDisplayText := Value;
    GridView.Changed(vcProperty);
  end;
end;

procedure TcxGridDBTableSummaryItem.SetVisibleForCustomization(Value: Boolean);
begin
  if FVisibleForCustomization <> Value then
  begin
    FVisibleForCustomization := Value;
    GridView.Changed(vcProperty);
  end;
end;

function TcxGridDBTableSummaryItem.QueryInterface(const IID: TGUID; out Obj): HResult;
const
  E_NOINTERFACE = HResult($80004002);
begin
  if GetInterface(IID, Obj) then
    Result := 0
  else
    Result := E_NOINTERFACE;
end;

function TcxGridDBTableSummaryItem._AddRef: Integer;
begin
  Result := -1;
end;

function TcxGridDBTableSummaryItem._Release: Integer;
begin
  Result := -1;
end;

function TcxGridDBTableSummaryItem.GetObjectName: string;
begin
  Result := '';
end;

function TcxGridDBTableSummaryItem.GetProperties(AProperties: TStrings): Boolean;
begin
  AProperties.Add('Column');
  Result := False;
end;

procedure TcxGridDBTableSummaryItem.GetPropertyValue(const AName: string; var AValue: Variant);
begin
  if AName = 'Column' then
    if Column <> nil then
      AValue := (Column as IcxStoredObject).GetObjectName
    else
      AValue := '';
end;

procedure TcxGridDBTableSummaryItem.SetPropertyValue(const AName: string; const AValue: Variant);
begin
  if AName = 'Column' then
    Column := TcxGridColumn(TcxCustomGridTableViewAccess.FindItemByObjectName(GridView, AValue));
end;

function TcxGridDBTableSummaryItem.GetDisplayText: string;
begin
  Result := DisplayText;
end;

function TcxGridDBTableSummaryItem.GetVisibleForCustomization: Boolean;
begin
  Result := VisibleForCustomization;
end;

procedure TcxGridDBTableSummaryItem.Assign(Source: TPersistent);
begin
  inherited;
  if Source is TcxGridDBTableSummaryItem then
    with TcxGridDBTableSummaryItem(Source) do
    begin
      Self.DisplayText := DisplayText;
      Self.VisibleForCustomization := VisibleForCustomization;
    end;
end;

{ TcxGridDBTableView }

function TcxGridDBTableView.GetColumn(Index: Integer): TcxGridDBColumn;
begin
  Result := TcxGridDBColumn(inherited Columns[Index]);
end;

function TcxGridDBTableView.GetDataController: TcxGridDBDataController;
begin
  Result := TcxGridDBDataController(FDataController);
end;

procedure TcxGridDBTableView.SetColumn(Index: Integer; Value: TcxGridDBColumn);
begin
  inherited Columns[Index] := Value;
end;

procedure TcxGridDBTableView.SetDataController(Value: TcxGridDBDataController);
begin
  FDataController.Assign(Value);
end;

function TcxGridDBTableView.GetDataControllerClass: TcxCustomDataControllerClass;
begin
  Result := TcxGridDBDataController;
end;

function TcxGridDBTableView.GetItemClass: TcxCustomGridTableItemClass;
begin
  Result := TcxGridDBColumn;
end;

function TcxGridDBTableView.GetSummaryItemClass: TcxDataSummaryItemClass;
begin
  Result := TcxGridDBTableSummaryItem;
end;

function TcxGridDBTableView.CreateColumn: TcxGridDBColumn;
begin
  Result := TcxGridDBColumn(inherited CreateColumn);
end;

function TcxGridDBTableView.GetColumnByFieldName(const AFieldName: string): TcxGridDBColumn;
begin
  Result := TcxGridDBColumn(DataController.GetItemByFieldName(AFieldName));
end;

initialization
  cxGridRegisteredViews.Register(TcxGridDBTableView, 'DB Table');
  Classes.RegisterClass(TcxGridDBColumn);

finalization
  cxGridRegisteredViews.Unregister(TcxGridDBTableView);

end.