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114 lines
3.9 KiB
ObjectPascal
114 lines
3.9 KiB
ObjectPascal
{
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Double Commander
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-------------------------------------------------------------------------
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Compute signature of a form, frame, etc. based on current options set
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Copyright (C) 2015 Alexander Koblov (alexx2000@mail.ru)
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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}
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unit uComponentsSignature;
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{$mode objfpc}{$H+}
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interface
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uses
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Classes, EditBtn;
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function ComputeSignatureBasedOnComponent(aComponent: TComponent; seed: dword): dword;
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implementation
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uses
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Graphics, ComCtrls, ColorBox, ExtCtrls, Spin, StdCtrls, Math, Dialogs,
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SysUtils, crc;
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const
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SAMPLEBYTES: array[0..1] of byte = ($23, $35);
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function ComputeSignatureBasedOnComponent(aComponent: TComponent; seed: dword): dword;
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var
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iComponent: integer;
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SampleValue: dword;
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iSampleValue: integer;
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ColorSampleValue: TColor;
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begin
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Result := seed;
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for iComponent := 0 to pred(aComponent.ComponentCount) do
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begin
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if aComponent.Components[iComponent].ComponentCount > 0 then
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Result := ComputeSignatureBasedOnComponent(aComponent.Components[iComponent], Result);
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case aComponent.Components[iComponent].ClassName of
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'TCheckBox':
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Result := crc32(Result, @SAMPLEBYTES[ifthen(TCheckBox(aComponent.Components[iComponent]).Checked, 1, 0)], 1);
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'TRadioButton':
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Result := crc32(Result, @SAMPLEBYTES[ifthen(TRadioButton(aComponent.Components[iComponent]).Checked, 1, 0)], 1);
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'TEdit':
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if length(TEdit(aComponent.Components[iComponent]).Text) > 0 then
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Result := crc32(Result, @TEdit(aComponent.Components[iComponent]).Text[1], length(TEdit(aComponent.Components[iComponent]).Text));
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'TLabeledEdit':
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begin
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if length(TLabeledEdit(aComponent.Components[iComponent]).Text) > 0 then
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Result := crc32(Result, @TLabeledEdit(aComponent.Components[iComponent]).Text[1], length(TLabeledEdit(aComponent.Components[iComponent]).Text));
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end;
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'TFileNameEdit':
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if length(TFileNameEdit(aComponent.Components[iComponent]).FileName) > 0 then
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Result := crc32(Result, @TFileNameEdit(aComponent.Components[iComponent]).FileName[1], length(TFileNameEdit(aComponent.Components[iComponent]).FileName));
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'TComboBox':
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begin
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SampleValue := TComboBox(aComponent.Components[iComponent]).ItemIndex;
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Result := crc32(Result, @SampleValue, sizeof(SampleValue));
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if length(TComboBox(aComponent.Components[iComponent]).Text) > 0 then
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Result := crc32(Result, @TComboBox(aComponent.Components[iComponent]).Text[1], length(TComboBox(aComponent.Components[iComponent]).Text));
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end;
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'TSpinEdit':
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begin
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SampleValue := TSpinEdit(aComponent.Components[iComponent]).Value;
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Result := crc32(Result, @SampleValue, sizeof(SampleValue));
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end;
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'TColorBox':
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begin
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ColorSampleValue := TColorBox(aComponent.Components[iComponent]).Selected;
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Result := crc32(Result, @ColorSampleValue, 4);
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end;
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'TTrackBar':
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begin
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iSampleValue := TTrackBar(aComponent.Components[iComponent]).Position;
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Result := crc32(Result, @iSampleValue, 4);
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end;
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end;
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end;
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end;
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end.
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