OnSysRead is pure virtual

[wxWidgets.git] / interface / wx / datectrl.h

/////////////////////////////////////////////////////////////////////////////
// Name:        datectrl.h
// Purpose:     interface of wxDatePickerCtrl
// Author:      wxWidgets team
// RCS-ID:      $Id$
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

/**
    @class wxDatePickerCtrl

    This control allows the user to select a date. Unlike wxCalendarCtrl, which
    is a relatively big control, wxDatePickerCtrl is implemented as a small
    window showing the currently selected date. The control can be edited using
    the keyboard, and can also display a popup window for more user-friendly
    date selection, depending on the styles used and the platform, except
    PalmOS where date is selected using native dialog.

    It is only available if @c wxUSE_DATEPICKCTRL is set to 1.

    @beginStyleTable
    @style{wxDP_SPIN}
           Creates a control without a month calendar drop down but with
           spin-control-like arrows to change individual date components. This
           style is not supported by the generic version.
    @style{wxDP_DROPDOWN}
           Creates a control with a month calendar drop-down part from which
           the user can select a date.
    @style{wxDP_DEFAULT}
           Creates a control with the style that is best supported for the
           current platform (currently wxDP_SPIN under Windows and
           wxDP_DROPDOWN elsewhere).
    @style{wxDP_ALLOWNONE}
           With this style, the control allows the user to not enter any valid
           date at all. Without it - the default - the control always has some
           valid date.
    @style{wxDP_SHOWCENTURY}
           Forces display of the century in the default date format. Without
           this style the century could be displayed, or not, depending on the
           default date representation in the system.
    @endStyleTable

    @beginEventEmissionTable{wxDateEvent}
    @event{EVT_DATE_CHANGED(id, func)}
           This event fires when the user changes the current selection in the
           control.
    @endEventTable

    @library{wxadv}
    @category{pickers}
    @appearance{datepickerctrl.png}

    @see wxCalendarCtrl, wxDateEvent
*/
class wxDatePickerCtrl : public wxControl
{
public:
    /**
        Initializes the object and calls Create() with all the parameters.
    */
    wxDatePickerCtrl(wxWindow* parent, wxWindowID id,
                     const wxDateTime& dt = wxDefaultDateTime,
                     const wxPoint& pos = wxDefaultPosition,
                     const wxSize& size = wxDefaultSize,
                     long style = wxDP_DEFAULT | wxDP_SHOWCENTURY,
                     const wxValidator& validator = wxDefaultValidator,
                     const wxString& name = "datectrl");

    /**
        Create the control window.

        This method should only be used for objects created using default
        constructor.

        @param parent
            Parent window, must not be non-@NULL.
        @param id
            The identifier for the control.
        @param dt
            The initial value of the control, if an invalid date (such as the
            default value) is used, the control is set to today.
        @param pos
            Initial position.
        @param size
            Initial size. If left at default value, the control chooses its own
            best size by using the height approximately equal to a text control
            and width large enough to show the date string fully.
        @param style
            The window style, see the description of the styles in the class
            documentation.
        @param validator
            Validator which can be used for additional date checks.
        @param name
            Control name.

        @return @true if the control was successfully created or @false if
                 creation failed.
    */
    bool Create(wxWindow* parent, wxWindowID id,
                const wxDateTime& dt = wxDefaultDateTime,
                const wxPoint& pos = wxDefaultPosition,
                const wxSize& size = wxDefaultSize,
                long style = wxDP_DEFAULT | wxDP_SHOWCENTURY,
                const wxValidator& validator = wxDefaultValidator,
                const wxString& name = "datectrl");

    /**
        If the control had been previously limited to a range of dates using
        SetRange(), returns the lower and upper bounds of this range. If no
        range is set (or only one of the bounds is set), @a dt1 and/or @a dt2
        are set to be invalid.

        Notice that when using a native MSW implementation of this control the
        lower range is always set, even if SetRange() hadn't been called
        explicitly, as the native control only supports dates later than year
        1601.

        @param dt1
            Pointer to the object which receives the lower range limit or
            becomes invalid if it is not set. May be @NULL if the caller is not
            interested in lower limit.
        @param dt2
            Same as above but for the upper limit.

        @return @false if no range limits are currently set, @true if at least
                 one bound is set.
    */
    virtual bool GetRange(wxDateTime* dt1, wxDateTime* dt2) const = 0;

    /**
        Returns the currently entered date.

        For a control with @c wxDP_ALLOWNONE style the returned value may be
        invalid if no date is entered, otherwise it is always valid.
    */
    virtual wxDateTime GetValue() const = 0;

    /**
        Sets the valid range for the date selection. If @a dt1 is valid, it
        becomes the earliest date (inclusive) accepted by the control. If
        @a dt2 is valid, it becomes the latest possible date.

        @remarks If the current value of the control is outside of the newly
                 set range bounds, the behaviour is undefined.
    */
    virtual void SetRange(const wxDateTime& dt1, const wxDateTime& dt2) = 0;

    /**
        Changes the current value of the control.

        The date should be valid unless the control was created with @c
        wxDP_ALLOWNONE style and included in the currently selected range, if
        any.

        Calling this method does not result in a date change event.
    */
    virtual void SetValue(const wxDateTime& dt) = 0;
};