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{
***************************************************************************
* *
* This source is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This code is distributed in the hope that it will be useful, but *
* WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* General Public License for more details. *
* *
* A copy of the GNU General Public License is available on the World *
* Wide Web at <http://www.gnu.org/copyleft/gpl.html>. You can also *
* obtain it by writing to the Free Software Foundation, *
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
* *
***************************************************************************
author: Alexandru Alexandrov
date: 11.06.2005
}
unit fieldslist;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, LResources, Forms, Controls, Graphics, Dialogs, ComCtrls,
Buttons, DB, StdCtrls, ObjInspStrConsts, ComponentEditors, PropEdits;
type
{ TFieldsListFrm }
TFieldsListFrm = class(TForm)
BitBtnOk: TBitBtn;
BitBtnCancel: TBitBtn;
ListBox1: TListBox;
procedure BitBtnOkClick(Sender: TObject);
private
{ private declarations }
FDesigner: TComponentEditorDesigner;
LinkDataset: TDataset;
procedure RefreshFieldsList;
public
{ public declarations }
constructor Create(AOwner: TComponent; ADataset: TDataset;
ADesigner: TComponentEditorDesigner); reintroduce;
end;
var
FieldsListFrm: TFieldsListFrm;
implementation
{ TFieldsListFrm }
procedure TFieldsListFrm.BitBtnOkClick(Sender: TObject);
var
i: integer;
NewField: TField;
fModified: boolean;
PreActive: boolean;
function CreateFieldName(Owner:TComponent;const AName:string):string;
var
j:integer;
begin
for j:=0 to Owner.ComponentCount - 1 do
begin
if CompareText(Owner.Components[j].Name, AName)=0 then
begin
Result:=FDesigner.CreateUniqueComponentName(LinkDataset.Name + NewField.FieldName);
exit;
end;
end;
Result:=AName;
end;
begin
LinkDataset.DisableControls;
try
PreActive := LinkDataset.Active;
try
LinkDataSet.Active := False;
fModified := False;
for i := 0 to ListBox1.Items.Count - 1 do
begin
if ListBox1.Selected[i] And (LinkDataset.FindField(ListBox1.Items[i]) = Nil) then
begin
NewField := TFieldDef(ListBox1.Items.Objects[i]).CreateField(LinkDataset.Owner);
NewField.Name := CreateFieldName(LinkDataset.Owner, LinkDataset.Name + NewField.FieldName);
FDesigner.PropertyEditorHook.PersistentAdded(NewField, True);
fModified := True;
end;
end;
if fModified then FDesigner.Modified;
Finally
if PreActive then
LinkDataset.Active:=True;
end;
Finally
LinkDataset.EnableControls;
end;
end;
procedure TFieldsListFrm.RefreshFieldsList;
function CheckField(f: TFieldDef): boolean;
begin
Result := Assigned(f) And (LinkDataSet.FindField(f.Name) = Nil);
end;
function FillList: integer;
var
i: integer;
f: TFieldDef;
begin
Result := 0;
with LinkDataset do begin
for i := 0 to FieldDefs.Count - 1 do begin
f := FieldDefs.Items[i];
if CheckField(f) then begin
ListBox1.Items.AddObject(f.Name, f);
inc(Result);
end;
end;
end;
end;
var
i: integer;
PreActive: boolean;
begin
i := 0;
ListBox1.Clear;
BitBtnOk.Enabled := False;
if not Assigned(LinkDataset) then Exit;
// refresh fielddefs
LinkDataset.FieldDefs.Update;
PreActive:=LinkDataset.Active;
LinkDataset.Active := False;
Try
i := FillList;
BitBtnOk.Enabled := i > 0;
Finally
if PreActive then
LinkDataset.Active:=True;
end;
end;
constructor TFieldsListFrm.Create(AOwner: TComponent; ADataset: TDataset;
ADesigner: TComponentEditorDesigner);
begin
inherited Create(AOwner);
LinkDataset := ADataset;
if Not Assigned(LinkDataset) then ShowMessage('LinkDataset = nil!')
else begin
FDesigner := ADesigner;
Caption := fesFlTitle + ' - ' + LinkDataset.Name;
end;
RefreshFieldsList;
end;
initialization
{$I fieldslist.lrs}
end.
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