TCalendarDialog.Execute function

Declaration

function Execute: Boolean; override

Function result

Description

Execute is an overridden method in TCalendarDialog. It creates and configures a new TForm instance displayed for the dialog component. The dialog form includes controls needed to select a date value, and to accept or reject the selected value. This includes:

• TCalendar
• TButton instances for the OK and Cancel buttons.

Values from properties in the class instance are used to configure the dialog form, including:

Title

Used as the Caption for the dialog form.

DialogPosition

Sets the Position property in the form instance at run-time. At design-time, the dialog is centered on the screen.

DisplaySettings

Sets the display settings used for the TCalendar instance on the dialog form.

Date

Sets the initial value for DateTime in the TCalendar instance on the dialog form.

Methods in the class instance are assigned to the event handlers for the dialog form and its controls, including:

DialogShow

Assigned to the OnShow event handler in the dialog form.

DialogClose

Assigned to the OnClose event handler in the dialog form.

DialogCloseQuery

Assigned to the OnCloseQuery event handler in the dialog form.

CalendarDayChanged

Assigned to the OnDayChanged event handler in the TCalendar instance on the form.

CalendarMonthChanged

Assigned to the OnMonthChanged event handler in the TCalendar instance on the form.

CalendarYearChanged

Assigned to the OnYearChanged event handler in the TCalendar instance on the form.

CalendarChange

Assigned to the OnChange event handler in the TCalendar instance on the form.

CalendarDblClick

Assigned to the OnDblClick event handler in the TCalendar instance on the form.

The ShowModal method for the dialog form is called to display the form and capture the return value. The return value is True if the ModalResult value is mrOK (when the OK button was clicked). The return value is False if the Cancel button was clicked or the form was closed using the window decoration.

The date selected using the calendar control is stored when the CalendarChange routine is executed (via TCalendar.OnChange). This causes the OnChange event handler in the class instance to be signalled to store the updated value.

The form is freed prior to exiting from the method.

See also

• TCommonDialog.Execute