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Alexander Koblov 2015-05-31 17:41:35 +00:00
commit 2a4307d3de
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src/frames/ucomponentssignature.pas Normal file
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{
Double Commander
-------------------------------------------------------------------------
Compute signature of a form, frame, etc. based on current options set
Copyright (C) 2015 Alexander Koblov (alexx2000@mail.ru)
This program 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 program 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.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
}
unit uComponentsSignature;
{$mode objfpc}{$H+}
interface
uses
Classes, EditBtn;
function ComputeSignatureBasedOnComponent(aComponent: TComponent; seed: dword): dword;
implementation
uses
Graphics, ComCtrls, ColorBox, ExtCtrls, Spin, StdCtrls, Math, Dialogs,
SysUtils, crc;
const
SAMPLEBYTES: array[0..1] of byte = ($23, $35);
function ComputeSignatureBasedOnComponent(aComponent: TComponent; seed: dword): dword;
var
iComponent: integer;
SampleValue: dword;
iSampleValue: integer;
ColorSampleValue: TColor;
begin
Result := seed;
for iComponent := 0 to pred(aComponent.ComponentCount) do
begin
if aComponent.Components[iComponent].ComponentCount > 0 then
Result := ComputeSignatureBasedOnComponent(aComponent.Components[iComponent], Result);
case aComponent.Components[iComponent].ClassName of
'TCheckBox':
Result := crc32(Result, @SAMPLEBYTES[ifthen(TCheckBox(aComponent.Components[iComponent]).Checked, 1, 0)], 1);
'TRadioButton':
Result := crc32(Result, @SAMPLEBYTES[ifthen(TRadioButton(aComponent.Components[iComponent]).Checked, 1, 0)], 1);
'TEdit':
if length(TEdit(aComponent.Components[iComponent]).Text) > 0 then
Result := crc32(Result, @TEdit(aComponent.Components[iComponent]).Text[1], length(TEdit(aComponent.Components[iComponent]).Text));
'TLabeledEdit':
begin
if length(TLabeledEdit(aComponent.Components[iComponent]).Text) > 0 then
Result := crc32(Result, @TLabeledEdit(aComponent.Components[iComponent]).Text[1], length(TLabeledEdit(aComponent.Components[iComponent]).Text));
end;
'TFileNameEdit':
if length(TFileNameEdit(aComponent.Components[iComponent]).FileName) > 0 then
Result := crc32(Result, @TFileNameEdit(aComponent.Components[iComponent]).FileName[1], length(TFileNameEdit(aComponent.Components[iComponent]).FileName));
'TComboBox':
begin
SampleValue := TComboBox(aComponent.Components[iComponent]).ItemIndex;
Result := crc32(Result, @SampleValue, sizeof(SampleValue));
if length(TComboBox(aComponent.Components[iComponent]).Text) > 0 then
Result := crc32(Result, @TComboBox(aComponent.Components[iComponent]).Text[1], length(TComboBox(aComponent.Components[iComponent]).Text));
end;
'TSpinEdit':
begin
SampleValue := TSpinEdit(aComponent.Components[iComponent]).Value;
Result := crc32(Result, @SampleValue, sizeof(SampleValue));
end;
'TColorBox':
begin
ColorSampleValue := TColorBox(aComponent.Components[iComponent]).Selected;
Result := crc32(Result, @ColorSampleValue, 4);
end;
'TTrackBar':
begin
iSampleValue := TTrackBar(aComponent.Components[iComponent]).Position;
Result := crc32(Result, @iSampleValue, 4);
end;
end;
end;
end;
end.