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git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@7886 8e941d3f-bd1b-0410-a28a-d453659cc2b4
91 lines
1.9 KiB
ObjectPascal
91 lines
1.9 KiB
ObjectPascal
unit SLDUnit;
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{$mode objfpc}{$H+}
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interface
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uses
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Classes, SysUtils, FileUtil, LResources, Forms, Controls, Graphics, Dialogs,
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StdCtrls, contexthelpunit;
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type
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{ TSLDepFrm }
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TSLDepFrm = class(TForm)
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HelpBtn: TButton;
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ResetBtn: TButton;
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ComputeBtn: TButton;
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ReturnBtn: TButton;
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CostEdit: TEdit;
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SalvageEdit: TEdit;
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PeriodsEdit: TEdit;
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DepreciationEdit: TEdit;
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Label1: TLabel;
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Label2: TLabel;
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Label3: TLabel;
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Label4: TLabel;
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procedure ComputeBtnClick(Sender: TObject);
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procedure FormShow(Sender: TObject);
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procedure HelpBtnClick(Sender: TObject);
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procedure ResetBtnClick(Sender: TObject);
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function SLNDepreciation(Cost, Salvage: Extended; Life: Integer): Extended;
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private
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{ private declarations }
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public
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{ public declarations }
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end;
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var
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SLDepFrm: TSLDepFrm;
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implementation
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{ TSLDepFrm }
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procedure TSLDepFrm.ResetBtnClick(Sender: TObject);
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begin
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CostEdit.Text := '';
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SalvageEdit.Text := '';
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PeriodsEdit.Text := '';
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DepreciationEdit.Text := '';
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end;
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procedure TSLDepFrm.FormShow(Sender: TObject);
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begin
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ResetBtnClick(self);
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end;
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procedure TSLDepFrm.HelpBtnClick(Sender: TObject);
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begin
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ContextHelpForm.HelpMessage((Sender as TButton).tag);
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end;
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procedure TSLDepFrm.ComputeBtnClick(Sender: TObject);
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VAR
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Cost, Depr, Salvage : Extended;
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Life : integer;
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begin
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// Obtain results
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Cost := StrToFloat(CostEdit.Text);
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Salvage := StrToFloat(SalvageEdit.Text);
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Life := StrToInt(PeriodsEdit.Text);
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Depr := SLNDepreciation(Cost, Salvage, Life);
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DepreciationEdit.Text := FloatToStr(Depr);
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end;
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function TSLDepFrm.SLNDepreciation(Cost, Salvage: Extended; Life: Integer): Extended;
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{ Spreads depreciation linearly over life. }
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begin
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if Life < 1 then ShowMessage('ERROR in SLNDepreciation - Life < 1');
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Result := (Cost - Salvage) / Life
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end;
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initialization
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{$I sldunit.lrs}
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end.
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