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torben |
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(* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is TurboPower SysTools
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*
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* The Initial Developer of the Original Code is
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* TurboPower Software
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*
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* Portions created by the Initial Developer are Copyright (C) 1996-2002
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* ***** END LICENSE BLOCK ***** *)
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unit ExExprU;
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interface
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uses
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Windows, Messages, SysUtils, Classes, Graphics, Controls,
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Forms, Dialogs, ExtCtrls, Buttons, StdCtrls,
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StBase, StConst, StExpr;
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type
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TStDlg = class(TForm)
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Label1: TLabel;
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ResultEdit: TEdit;
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Label2: TLabel;
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EvaluateBtn: TBitBtn;
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ClearBtn: TBitBtn;
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Panel1: TPanel;
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Panel2: TPanel;
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ExprEdit: TStExpressionEdit;
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DivBtn: TBitBtn;
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MulBtn: TBitBtn;
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MinusBtn: TBitBtn;
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PlusBtn: TBitBtn;
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EBtn: TBitBtn;
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Nr3Btn: TBitBtn;
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Nr6Btn: TBitBtn;
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Nr9Btn: TBitBtn;
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DotBtn: TBitBtn;
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Nr2Btn: TBitBtn;
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Nr5Btn: TBitBtn;
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Nr8Btn: TBitBtn;
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Nr0Btn: TBitBtn;
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Nr1Btn: TBitBtn;
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Nr4Btn: TBitBtn;
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Nr7Btn: TBitBtn;
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SqrtBtn: TBitBtn;
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PiBtn: TBitBtn;
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ExpBtn: TBitBtn;
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PowerBtn: TBitBtn;
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CommaBtn: TBitBtn;
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CosBtn: TBitBtn;
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LnBtn: TBitBtn;
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SqrBtn: TBitBtn;
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RParBtn: TBitBtn;
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ArctanBtn: TBitBtn;
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IntBtn: TBitBtn;
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SinBtn: TBitBtn;
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LParBtn: TBitBtn;
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AbsBtn: TBitBtn;
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FracBtn: TBitBtn;
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RoundBtn: TBitBtn;
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BSBtn: TBitBtn;
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procedure LParBtnClick(Sender: TObject);
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procedure RParBtnClick(Sender: TObject);
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procedure CommaBtnClick(Sender: TObject);
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procedure PowerBtnClick(Sender: TObject);
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procedure AbsBtnClick(Sender: TObject);
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procedure ArctanBtnClick(Sender: TObject);
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procedure CosBtnClick(Sender: TObject);
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procedure ExpBtnClick(Sender: TObject);
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procedure FracBtnClick(Sender: TObject);
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procedure IntBtnClick(Sender: TObject);
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procedure LnBtnClick(Sender: TObject);
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procedure PiBtnClick(Sender: TObject);
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procedure RoundBtnClick(Sender: TObject);
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procedure SinBtnClick(Sender: TObject);
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procedure SqrBtnClick(Sender: TObject);
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procedure SqrtBtnClick(Sender: TObject);
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procedure Nr0BtnClick(Sender: TObject);
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procedure Nr1BtnClick(Sender: TObject);
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procedure Nr2BtnClick(Sender: TObject);
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procedure Nr3BtnClick(Sender: TObject);
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procedure Nr4BtnClick(Sender: TObject);
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procedure Nr5BtnClick(Sender: TObject);
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procedure Nr6BtnClick(Sender: TObject);
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procedure Nr7BtnClick(Sender: TObject);
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procedure Nr8BtnClick(Sender: TObject);
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procedure Nr9BtnClick(Sender: TObject);
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procedure DotBtnClick(Sender: TObject);
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procedure EBtnClick(Sender: TObject);
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procedure PlusBtnClick(Sender: TObject);
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procedure MinusBtnClick(Sender: TObject);
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procedure MulBtnClick(Sender: TObject);
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procedure DivBtnClick(Sender: TObject);
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procedure EvaluateBtnClick(Sender: TObject);
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procedure ClearBtnClick(Sender: TObject);
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procedure ExprEditError(Sender: TObject; ErrorNumber: Longint;
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const ErrorStr: String);
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procedure BSBtnClick(Sender: TObject);
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private
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procedure AddExpr(Add : string; Parens : Boolean);
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end;
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var
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StDlg: TStDlg;
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implementation
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{$R *.DFM}
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procedure TStDlg.AddExpr(add : string; parens : boolean);
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var
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position, sellen : integer;
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temp : string;
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begin
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position := ExprEdit.SelStart+1;
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sellen := ExprEdit.SelLength;
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temp := ExprEdit.Text;
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if (parens) then begin
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add := add+'(';
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if (sellen > 0) then
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{surround the selection with the parentheses}
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insert(')', temp, position+sellen)
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else
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add := add+')';
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end;
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insert(add, temp, position);
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ExprEdit.Text := temp;
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ExprEdit.SetFocus;
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if (parens) then begin
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if (sellen > 0) then
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{position after the add}
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ExprEdit.SelStart := position+sellen+length(add)
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else
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{position before last parenthesis}
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ExprEdit.SelStart := position+length(add)-2;
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end else
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{position after the add}
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ExprEdit.SelStart := position+length(add)-1;
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ExprEdit.SelLength := 0;
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end;
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procedure TStDlg.LParBtnClick(Sender: TObject);
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begin
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AddExpr('(', False);
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end;
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procedure TStDlg.RParBtnClick(Sender: TObject);
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begin
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AddExpr(')', False);
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end;
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procedure TStDlg.CommaBtnClick(Sender: TObject);
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begin
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AddExpr(ListSeparator, False);
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end;
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procedure TStDlg.PowerBtnClick(Sender: TObject);
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begin
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AddExpr('^', False);
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end;
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procedure TStDlg.AbsBtnClick(Sender: TObject);
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begin
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AddExpr('abs', True);
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end;
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procedure TStDlg.ArctanBtnClick(Sender: TObject);
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begin
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AddExpr('arctan', True);
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end;
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procedure TStDlg.CosBtnClick(Sender: TObject);
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begin
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AddExpr('cos', True);
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end;
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procedure TStDlg.ExpBtnClick(Sender: TObject);
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begin
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AddExpr('exp', True);
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end;
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procedure TStDlg.FracBtnClick(Sender: TObject);
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begin
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AddExpr('frac', True);
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end;
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procedure TStDlg.IntBtnClick(Sender: TObject);
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begin
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AddExpr('int', True);
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end;
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procedure TStDlg.LnBtnClick(Sender: TObject);
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begin
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AddExpr('ln', True);
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end;
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procedure TStDlg.PiBtnClick(Sender: TObject);
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begin
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AddExpr('pi', False);
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end;
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procedure TStDlg.RoundBtnClick(Sender: TObject);
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begin
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AddExpr('round', True);
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end;
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procedure TStDlg.SinBtnClick(Sender: TObject);
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begin
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AddExpr('sin', True);
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end;
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procedure TStDlg.SqrBtnClick(Sender: TObject);
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begin
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AddExpr('sqr', True);
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end;
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procedure TStDlg.SqrtBtnClick(Sender: TObject);
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begin
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AddExpr('sqrt', True);
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end;
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procedure TStDlg.Nr0BtnClick(Sender: TObject);
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begin
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AddExpr('0', False);
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end;
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procedure TStDlg.Nr1BtnClick(Sender: TObject);
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begin
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AddExpr('1', False);
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end;
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procedure TStDlg.Nr2BtnClick(Sender: TObject);
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begin
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AddExpr('2', False);
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end;
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procedure TStDlg.Nr3BtnClick(Sender: TObject);
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begin
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AddExpr('3', False);
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end;
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procedure TStDlg.Nr4BtnClick(Sender: TObject);
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begin
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AddExpr('4', False);
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end;
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procedure TStDlg.Nr5BtnClick(Sender: TObject);
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begin
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AddExpr('5', False);
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end;
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procedure TStDlg.Nr6BtnClick(Sender: TObject);
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begin
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AddExpr('6', False);
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end;
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procedure TStDlg.Nr7BtnClick(Sender: TObject);
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begin
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AddExpr('7', False);
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end;
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procedure TStDlg.Nr8BtnClick(Sender: TObject);
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begin
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AddExpr('8', False);
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end;
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procedure TStDlg.Nr9BtnClick(Sender: TObject);
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begin
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AddExpr('9', False);
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end;
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procedure TStDlg.DotBtnClick(Sender: TObject);
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begin
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AddExpr(DecimalSeparator, False);
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end;
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procedure TStDlg.EBtnClick(Sender: TObject);
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begin
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AddExpr('E', False);
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end;
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procedure TStDlg.PlusBtnClick(Sender: TObject);
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begin
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AddExpr('+', False);
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end;
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procedure TStDlg.MinusBtnClick(Sender: TObject);
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begin
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AddExpr('-', False);
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end;
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procedure TStDlg.MulBtnClick(Sender: TObject);
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begin
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AddExpr('*', False);
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end;
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procedure TStDlg.DivBtnClick(Sender: TObject);
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begin
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AddExpr('/', False);
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end;
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procedure TStDlg.EvaluateBtnClick(Sender: TObject);
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var
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res : double;
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begin
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res := ExprEdit.Evaluate;
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if ExprEdit.Expr.LastError = 0 then
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ResultEdit.Text := FloatToStr(res);
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ExprEdit.SetFocus;
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end;
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procedure TStDlg.ClearBtnClick(Sender: TObject);
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begin
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ExprEdit.Text := '';
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ResultEdit.Text := '';
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ExprEdit.SetFocus;
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end;
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procedure TStDlg.ExprEditError(Sender: TObject; ErrorNumber: Longint;
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const ErrorStr: String);
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begin
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ResultEdit.Text := 'Error ' + IntToStr(ErrorNumber) + ': ' + ErrorStr;
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end;
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procedure TStDlg.BSBtnClick(Sender: TObject);
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begin
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ExprEdit.Perform(WM_CHAR, VK_BACK, 0);
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end;
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end.
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