Componentes.Terceros.DevExpressVCL/internal/x.44/1/ExpressPrinting System/Sources/dxPSdxDBTVLnk.pas

{*******************************************************************}
{                                                                   }
{       Developer Express Visual Component Library                  }
{       ExpressPrinting System(tm) COMPONENT SUITE                  }
{                                                                   }
{       Copyright (C) 1998-2009 Developer Express Inc.              }
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{   RESTRICTIONS                                                    }
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{   EXECUTABLE PROGRAM ONLY.                                        }
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{*******************************************************************}

unit dxPSdxDBTVLnk;

interface

{$I cxVer.inc}

uses
  DB, dxTree, dxDBTree, dxPSTVLnk;

type
  TdxTreeViewExReportLink = class(TCustomdxTreeViewReportLink)
  private
    function GetdxTreeView: TdxTreeView;
  protected
    procedure InternalRestoreFromOriginal; override;
  public
    property dxTreeView: TdxTreeView read GetdxTreeView;
  published
    property AutoNodesExpand;
    property AutoWidth;
    property Color;
    property ExpandLevel;
    property ExplicitTreeViewExpand;
    property Font;
    property GridLineColor;
    property Options;
    property ScaleFonts;
    property SupportedCustomDraw;
    property Transparent;
    property TreeLineColor;
    property UseVertDelimiters;
    property Width;
    
    property OnCustomDrawNode;
    property OnInitializeNode;
  end;

  TdxDBTreeViewReportLink = class(TdxTreeViewExReportLink)
  private
    FBookmark: TBookmark;
    function GetDBTreeView: TdxDBTreeView;
  protected
    procedure PrepareContruct; override;
    procedure UnprepareContruct; override;
  public
    property DBTreeView: TdxDBTreeView read GetDBTreeView;
  end;

implementation

uses
  dxPSCore;

{ TdxTreeViewExReportLink }

function TdxTreeViewExReportLink.GetdxTreeView: TdxTreeView;
begin
  Result := TdxTreeView(Component);
end;

procedure TdxTreeViewExReportLink.InternalRestoreFromOriginal;
begin
  inherited;
  SupportedCustomDraw := dxTreeView.IsCustomDraw;
end;

{ TdxDBTreeViewReportLink }

function TdxDBTreeViewReportLink.GetDBTreeView: TdxDBTreeView;
begin
  Result := TdxDBTreeView(Component);
end;

procedure TdxDBTreeViewReportLink.PrepareContruct;
var
  DataSet: TDataSet;
begin
  inherited;
  
  if DBTreeView.DataSource <> nil then
    DataSet := DBTreeView.DataSource.DataSet
  else
    DataSet := nil;
  if DataSet <> nil then
  begin
    FBookmark := DataSet.GetBookmark;
    DataSet.DisableControls;
  end;
end;

procedure TdxDBTreeViewReportLink.UnprepareContruct;
var
  DataSet: TDataSet;
begin
  if DBTreeView.DataSource <> nil then
    DataSet := DBTreeView.DataSource.DataSet
  else
    DataSet := nil;

  if DataSet <> nil then
  begin
    if FBookmark <> nil then 
    begin
      DataSet.GotoBookmark(FBookmark);
      DataSet.FreeBookmark(FBookmark);
      FBookmark := nil;
    end;
    DataSet.EnableControls;
  end;
  
  inherited;
end;

initialization
  dxPSRegisterReportLink(TdxTreeViewExReportLink, TdxTreeView, TdxfmTVReportLinkDesignWindow);
  dxPSRegisterReportLink(TdxDBTreeViewReportLink, TdxDBTreeView, TdxfmTVReportLinkDesignWindow);

finalization
  dxPSUnRegisterReportLink(TdxTreeViewReportLink, TdxDBTreeView, TdxfmTVReportLinkDesignWindow);
  dxPSUnRegisterReportLink(TdxTreeViewExReportLink, TdxTreeView, TdxfmTVReportLinkDesignWindow);

end.