TCalculatorDialog class

In unit ExtDlgs

Implements a pop-up calculator dialog used to perform simple calculations and return the value.

Declaration

pascal

TCalculatorDialog = class(TExtCommonDialog)

Inheritance

Description

TCalculatorDialog is a TExtCommonDialog descendant which implements a pop-up calculator dialog used to perform calculations and return the result in the Value property. Value uses the Double type, and can be represented using the number of digits in the Precision property.

TCalculatorDialog uses a TCalculatorForm instance in the DlgForm property which includes separate panels to display the input value, numeric keys, labels, and other buttons on the dialog form. A CalculatorLayout property allows use of a detailed or a simplified view on the form. Properties are provided to set the colors used for components on DlgForm, including:

ColorBtnDigits
ColorBtnMemory
ColorBtnOk
ColorBtnCancel
ColorBtnClear
ColorBtnOthers
ColorDisplayText
ColorDisplayBack

Use the Memory property to store or retrieve a value for the calculator dialog.

Properties

`CalcDisplay`	public	CalcDisplay - the current numeric value in the main calculator display.
`Memory`	public	Memory - the value stored in the calculator's memory.
`BeepOnError`	published	BeepOnError - if True, beeps when there is an entry error or other calculator error.
`CalculatorLayout`	published	CalculatorLayout - whether simple or normal.
`Precision`	published	Precision - the level of precision to be used in calculations; default is set by DefCalcPrecision.
`Title`	published	The Title or Caption displayed for the dialog.
`Value`	published	Value - the numeric value (result) returned by the calculator.
`DialogScale`	published	Scaling percentage applied to the calculator dialog form.
`ColorBtnDigits`	published	Color for the digit buttons displayed in the calculator dialog.
`ColorBtnMemory`	published	Color for the Memory button displayed in the calculator dialog.
`ColorBtnOk`	published	Color for the OK button displayed in the calculator dialog.
`ColorBtnCancel`	published	Color for the Cancel button displayed in the calculator dialog.
`ColorBtnClear`	published	Color for the Clear button displayed in the calculator dialog.
`ColorBtnOthers`	published	Color for other buttons displayed in the calculator dialog.
`ColorDisplayText`	published	Color for text displayed in the calculator dialog.
`ColorDisplayBack`	published	Color for background in the display area for the calculator dialog.

Methods

`WSRegisterClass`	protected	Registers this component class with the current WidgetSet.
`OnDialogClose`	protected	Implements the event handler signalled when the dialog is closed.
`OnDialogShow`	protected
`OnDialogCloseQuery`	protected
`Change`	protected	Change - software emulator for the OnChange event ???
`CalcKey`	protected	Implements the event handler signalled to process keys in the dialog.
`DefaultTitle`	protected	Gets the default value used in the Title property for the calculator dialog.
`DisplayChange`	protected	Implements the event handler signalled when the calculator display has been changed on the dialog form.
`Create`	public	Constructor for the class instance.
`Destroy`	public	Destructor for the class instance.
`Execute`	public	Creates, configures, and displays the form for the calculator dialog.

Events

`OnCalcKey`	published	OnCalcKey - event handler for a key press in the calculator.
`OnChange`	published	OnChange - event handler for any change in the calculator.
`OnDisplayChange`	published	OnDisplayChange - event handler for any change in the calculator display.