{******************************************}
{                                          }
{             FastReport VCL               }
{              Aliases editor              }
{                                          }
{         Copyright (c) 1998-2021          }
{            by Fast Reports Inc.          }
{                                          }
{******************************************}

unit frxEditAliases;

interface

{$I frx.inc}

uses
  {$IFNDEF FPC}
  Windows, Messages,
  {$ENDIF}
  SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, ComCtrls, frxClass, frxBaseForm
  {$IFDEF FPC}
  , LResources, LCLType
  {$ENDIF}
{$IFDEF Delphi6}
, Variants
{$ENDIF};
  

type
  TfrxAliasesEditorForm = class(TfrxBaseForm)
    AliasesLV: TListView;
    OkB: TButton;
    CancelB: TButton;
    ResetB: TButton;
    HintL: TLabel;
    DSAliasL: TLabel;
    DSAliasE: TEdit;
    FieldAliasesL: TLabel;
    UpdateB: TButton;
    procedure FormHide(Sender: TObject);
    procedure FormShow(Sender: TObject);
    procedure ResetBClick(Sender: TObject);
    procedure AliasesLVKeyPress(Sender: TObject; var Key: Char);
    procedure FormCreate(Sender: TObject);
    procedure UpdateBClick(Sender: TObject);
    procedure FormKeyDown(Sender: TObject; var Key: Word;
      Shift: TShiftState);
    procedure AliasesLVEdited(Sender: TObject; Item: TListItem;
      var S: String);
  private
    FDataSet: TfrxCustomDBDataset;
    procedure BuildAliasList(List: TStrings);
  public
    procedure UpdateResouces; override;
    property DataSet: TfrxCustomDBDataset read FDataSet write FDataSet;
  end;


implementation

{$IFNDEF FPC}
{$R *.DFM}
{$ELSE}
{$R *.lfm}
{$ENDIF}

uses frxRes;


procedure TfrxAliasesEditorForm.BuildAliasList(List: TStrings);
var
  i: Integer;
  Item: TListItem;
  s: String;
begin
  AliasesLV.Items.Clear;
  for i := 0 to List.Count - 1 do
  begin
    s := List.Names[i];
    Item := AliasesLV.Items.Add;
    Item.Caption := List.Values[s];
    if s[1] = '-' then   { field is disabled }
      s := Copy(s, 2, 255) else
      Item.Checked := True;
    Item.SubItems.Add(s);
  end;
  if AliasesLV.Items.Count <> 0 then
    AliasesLV.Selected := AliasesLV.Items[0];
end;

procedure TfrxAliasesEditorForm.FormShow(Sender: TObject);
begin
  DSAliasE.Text := FDataSet.UserName;
  BuildAliasList(FDataSet.FieldAliases);
  if FDataSet.FieldAliases.Count = 0 then
    ResetBClick(nil);
end;

procedure TfrxAliasesEditorForm.FormHide(Sender: TObject);
var
  i: Integer;
  s: String;
begin
  if ModalResult = mrOk then
  begin
    FDataSet.UserName := DSAliasE.Text;
    FDataSet.FieldAliases.Clear;
    for i := 0 to AliasesLV.Items.Count - 1 do
    begin
      s := AliasesLV.Items[i].SubItems[0];
      if not AliasesLV.Items[i].Checked then { disable the field }
        s := '-' + s;
      FDataSet.FieldAliases.Add(s + '=' + AliasesLV.Items[i].Caption);
    end;
  end;
end;

procedure TfrxAliasesEditorForm.ResetBClick(Sender: TObject);
var
  i: Integer;
  l1, l2: TStrings;
begin
  l1 := TStringList.Create;
  l2 := TStringList.Create;
  l1.Assign(FDataSet.FieldAliases);
  { clear aliases to get real field names }
  FDataSet.FieldAliases.Clear;
  FDataSet.GetFieldList(l2);
  { set aliases back }
  FDataSet.FieldAliases.Assign(l1);
  l1.Free;

  for i := 0 to l2.Count - 1 do
    l2[i] := l2[i] + '=' + l2[i];

  BuildAliasList(l2);
  l2.Free;
end;

procedure TfrxAliasesEditorForm.UpdateBClick(Sender: TObject);
var
  i: Integer;
  l1, l2: TStrings;
begin
  l1 := TStringList.Create;
  l2 := TStringList.Create;
  l1.Assign(FDataSet.FieldAliases);
  try
    { clear aliases to get real field names }
    FDataSet.FieldAliases.Clear;
    FDataSet.GetFieldList(l2);
  finally
    { set aliases back }
    FDataSet.FieldAliases.Assign(l1);
  end;

  for i := 0 to l2.Count - 1 do
    if l1.IndexOfName(l2[i]) = -1 then
      l2[i] := l2[i] + '=' + l2[i]
    else
      l2[i] := l2[i] + '=' + l1.Values[l2[i]];

  BuildAliasList(l2);
  l1.Free;
  l2.Free;
end;

procedure TfrxAliasesEditorForm.UpdateResouces;
begin
  inherited;
  Caption := frxGet(3600);
  HintL.Caption := frxGet(3601);
  DSAliasL.Caption := frxGet(3602);
  FieldAliasesL.Caption := frxGet(3603);
  OkB.Caption := frxGet(1);
  CancelB.Caption := frxGet(2);
  ResetB.Caption := frxGet(3604);
  UpdateB.Caption := frxGet(3605);
  AliasesLV.Columns[0].Caption := frxResources.Get('alUserName');
  AliasesLV.Columns[1].Caption := frxResources.Get('alOriginal');
end;

procedure TfrxAliasesEditorForm.AliasesLVKeyPress(Sender: TObject;
  var Key: Char);
begin
  {$IFNDEF FPC}
  if (Key = #13) and (AliasesLV.Selected <> nil) then
    AliasesLV.Selected.EditCaption;
  {$ENDIF}
end;

procedure TfrxAliasesEditorForm.FormCreate(Sender: TObject);
begin
  if UseRightToLeftAlignment then
    FlipChildren(True);
end;

procedure TfrxAliasesEditorForm.FormKeyDown(Sender: TObject; var Key: Word;
  Shift: TShiftState);
begin
  if Key = VK_F1 then
    frxResources.Help(Self);
  {$IFNDEF FPC}
  if Key = VK_F2 then
    AliasesLV.Selected.EditCaption;
  {$ENDIF}
  if Key = VK_F5 then
    UpdateBClick(nil);
end;

procedure TfrxAliasesEditorForm.AliasesLVEdited(Sender: TObject;
  Item: TListItem; var S: String);
begin
  if s = '' then
    s := AliasesLV.Selected.SubItems[0];
end;

end.