GTK+ Reference Manual
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# GtkCalendar

## Name

GtkCalendar -- display a calendar and/or allow the user to select a date.

## Synopsis

    #include <gtk/gtk.h>

    struct      GtkCalendar;
    enum        GtkCalendarDisplayOptions;
    GtkWidget*  gtk_calendar_new                (void);
    gboolean    gtk_calendar_select_month       (GtkCalendar *calendar,
                                                 guint month,
                                                 guint year);
    void        gtk_calendar_select_day         (GtkCalendar *calendar,
                                                 guint day);
    gboolean    gtk_calendar_mark_day           (GtkCalendar *calendar,
                                                 guint day);
    gboolean    gtk_calendar_unmark_day         (GtkCalendar *calendar,
                                                 guint day);
    void        gtk_calendar_clear_marks        (GtkCalendar *calendar);
    void        gtk_calendar_display_options    (GtkCalendar *calendar,
                                                 GtkCalendarDisplayOptions flags);
    void        gtk_calendar_get_date           (GtkCalendar *calendar,
                                                 guint *year,
                                                 guint *month,
                                                 guint *day);
    void        gtk_calendar_freeze             (GtkCalendar *calendar);
    void        gtk_calendar_thaw               (GtkCalendar *calendar);

## Object Hierarchy

      GObject
       +----GtkObject
             +----GtkWidget
                   +----GtkCalendar

## Signal Prototypes

    "day-selected"
                void        user_function      (GtkCalendar *calendar,
                                                gpointer user_data);
    "day-selected-double-click"
                void        user_function      (GtkCalendar *calendar,
                                                gpointer user_data);
    "month-changed"
                void        user_function      (GtkCalendar *calendar,
                                                gpointer user_data);
    "next-month"
                void        user_function      (GtkCalendar *calendar,
                                                gpointer user_data);
    "next-year" void        user_function      (GtkCalendar *calendar,
                                                gpointer user_data);
    "prev-month"
                void        user_function      (GtkCalendar *calendar,
                                                gpointer user_data);
    "prev-year" void        user_function      (GtkCalendar *calendar,
                                                gpointer user_data);

## Description

GtkCalendar is a widget that displays a calendar, one month at a time. It can be created with gtk_calendar_new().

The month and year currently displayed can be altered with gtk_calendar_select_month(). The exact day can be selected from the displayed month using gtk_calendar_select_day().

To place a visual marker on a particular day, use gtk_calendar_mark_day() and to remove the marker, gtk_calendar_unmark_day(). Alternative, all marks can be cleared with gtk_calendar_clear_marks().

The way in which the calendar itself is displayed can be altered using gtk_calendar_display_options().

The selected date can be retrieved from a GtkCalendar using gtk_calendar_get_date().

If performing many 'mark' operations, the calendar can be frozen to prevent flicker, using gtk_calendar_freeze(), and 'thawed' again using gtk_calendar_thaw().

## Details

### struct GtkCalendar

    struct GtkCalendar;

`num_marked_dates` is an integer containing the number of days that have a mark over them.

`marked_date` is an array containing the day numbers that currently have a mark over them.

`month`, `year`, and `selected_day` contain the currently visible month, year, and selected day respectively.

All of these fields should be considered read only, and everything in this struct should only be modified using the functions provided below.

> Note: Note that `month` is zero-based (i.e it allowed values are 0-11) while `selected_day` is one-based (i.e. allowed values are 1-31).

### enum GtkCalendarDisplayOptions

    typedef enum
    {
      GTK_CALENDAR_SHOW_HEADING		= 1 << 0,
      GTK_CALENDAR_SHOW_DAY_NAMES		= 1 << 1,
      GTK_CALENDAR_NO_MONTH_CHANGE		= 1 << 2,
      GTK_CALENDAR_SHOW_WEEK_NUMBERS	= 1 << 3,
      GTK_CALENDAR_WEEK_START_MONDAY	= 1 << 4
    } GtkCalendarDisplayOptions;

GTK_CALENDAR_SHOW_HEADING | Specifies that the month and year should be displayed.
GTK_CALENDAR_SHOW_DAY_NAMES | Specifies that three letter day descriptions should be present.
GTK_CALENDAR_NO_MONTH_CHANGE | Prevents the user from switching months with the calendar.
GTK_CALENDAR_SHOW_WEEK_NUMBERS | Displays each week numbers of the current year, down the left side of the calendar.
GTK_CALENDAR_WEEK_START_MONDAY | Starts the calendar week on Monday, instead of the default Sunday.

### gtk_calendar_new ()

    GtkWidget*  gtk_calendar_new                (void);

Creates a new calendar, with the current date being selected.

Returns : | a GtkCalendar.

### gtk_calendar_select_month ()

    gboolean    gtk_calendar_select_month       (GtkCalendar *calendar,
                                                 guint month,
                                                 guint year);

Shifts the calendar to a different month.

`calendar` : | a GtkCalendar.
`month` : | a month number between 0 and 11.
`year` : | the year the month is in.
Returns : | `TRUE`.

### gtk_calendar_select_day ()

    void        gtk_calendar_select_day         (GtkCalendar *calendar,
                                                 guint day);

Selects a day from the current month.

`calendar` : | a GtkCalendar.
`day` : | the day number between 1 and 31, or 0 to unselect the currently selected day.

### gtk_calendar_mark_day ()

    gboolean    gtk_calendar_mark_day           (GtkCalendar *calendar,
                                                 guint day);

Places a visual marker on a particular day.

`calendar` : | a GtkCalendar.
`day` : | the day number to mark between 1 and 31.
Returns : | `TRUE`.

### gtk_calendar_unmark_day ()

    gboolean    gtk_calendar_unmark_day         (GtkCalendar *calendar,
                                                 guint day);

Removes the visual marker from a particular day.

`calendar` : | a GtkCalendar.
`day` : | the day number to unmark between 1 and 31.
Returns : | `TRUE`.

### gtk_calendar_clear_marks ()

    void        gtk_calendar_clear_marks        (GtkCalendar *calendar);

Remove all visual markers.

`calendar` : | a GtkCalendar.

### gtk_calendar_display_options ()

    void        gtk_calendar_display_options    (GtkCalendar *calendar,
                                                 GtkCalendarDisplayOptions flags);

Sets display options (whether to display the heading and the month headings).

`calendar` : | a GtkCalendar.
`flags` : | the display options to set.

### gtk_calendar_get_date ()

    void        gtk_calendar_get_date           (GtkCalendar *calendar,
                                                 guint *year,
                                                 guint *month,
                                                 guint *day);

Obtains the selected date from a GtkCalendar.

`calendar` : | a GtkCalendar.
`year` : | location to store the year number.
`month` : | location to store the month number.
`day` : | location to store the day number.

### gtk_calendar_freeze ()

    void        gtk_calendar_freeze             (GtkCalendar *calendar);

Locks the display of the calendar until it is thawed with gtk_calendar_thaw().

`calendar` : | a GtkCalendar.

### gtk_calendar_thaw ()

    void        gtk_calendar_thaw               (GtkCalendar *calendar);

Defrosts a calendar; all the changes made since the last gtk_calendar_freeze() are displayed.

`calendar` : | a GtkCalendar.

## Signals

### The "day-selected" signal

    void        user_function                  (GtkCalendar *calendar,
                                                gpointer user_data);

Emitted when the user selects a day.

`calendar` : | the object which received the signal.
`user_data` : | user data set when the signal handler was connected.

### The "day-selected-double-click" signal

    void        user_function                  (GtkCalendar *calendar,
                                                gpointer user_data);

`calendar` : | the object which received the signal.
`user_data` : | user data set when the signal handler was connected.

### The "month-changed" signal

    void        user_function                  (GtkCalendar *calendar,
                                                gpointer user_data);

Emitted when the user clicks a button to change the selected month on a calendar.

`calendar` : | the object which received the signal.
`user_data` : | user data set when the signal handler was connected.

### The "next-month" signal

    void        user_function                  (GtkCalendar *calendar,
                                                gpointer user_data);

`calendar` : | the object which received the signal.
`user_data` : | user data set when the signal handler was connected.

### The "next-year" signal

    void        user_function                  (GtkCalendar *calendar,
                                                gpointer user_data);

`calendar` : | the object which received the signal.
`user_data` : | user data set when the signal handler was connected.

### The "prev-month" signal

    void        user_function                  (GtkCalendar *calendar,
                                                gpointer user_data);

`calendar` : | the object which received the signal.
`user_data` : | user data set when the signal handler was connected.

### The "prev-year" signal

    void        user_function                  (GtkCalendar *calendar,
                                                gpointer user_data);

`calendar` : | the object which received the signal.
`user_data` : | user data set when the signal handler was connected.

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