68 lines
1.4 KiB
ObjectPascal
68 lines
1.4 KiB
ObjectPascal
unit ExprEvalExampleMain;
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interface
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uses
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Windows, SysUtils, Classes, Graphics, Controls, Forms, StdCtrls,
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JclExprEval;
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type
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TForm1 = class(TForm)
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ExpressionInput: TEdit;
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Memo1: TMemo;
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Label1: TLabel;
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EnterButton: TButton;
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FuncList: TComboBox;
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Label2: TLabel;
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procedure FormCreate(Sender: TObject);
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procedure FormDestroy(Sender: TObject);
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procedure EnterButtonClick(Sender: TObject);
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procedure FuncListClick(Sender: TObject);
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private
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{ Private declarations }
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FEvaluator: TEasyEvaluator;
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FX: Extended;
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FY: Extended;
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FZ: Extended;
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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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Form1: TForm1;
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implementation
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{$R *.DFM}
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uses
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ExprEvalExampleLogic;
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procedure TForm1.FormCreate(Sender: TObject);
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begin
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FEvaluator := TEvaluator.Create;
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FEvaluator.AddVar('X', FX);
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FEvaluator.AddVar('Y', FY);
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FEvaluator.AddVar('Z', FZ);
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Init(FEvaluator, FuncList.Items);
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end;
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procedure TForm1.FormDestroy(Sender: TObject);
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begin
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FEvaluator.Free;
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end;
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procedure TForm1.EnterButtonClick(Sender: TObject);
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begin
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Memo1.Lines.Add(ResultAsText(FEvaluator as TEvaluator, ExpressionInput.Text));
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end;
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procedure TForm1.FuncListClick(Sender: TObject);
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begin
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ExpressionInput.Text := ExpressionInput.Text + FuncList.Text;
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ActiveControl := ExpressionInput;
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ExpressionInput.SelStart := Length(ExpressionInput.Text);
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end;
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end.
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