path: root/calendar/gui/weekday-picker.c

/* Evolution calendar - Week day picker widget
 *
 * Copyright (C) 2000 Helix Code, Inc.
 *
 * Author: Federico Mena-Quintero <federico@helixcode.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <gtk/gtksignal.h>
#include <libgnomeui/gnome-canvas-rect-ellipse.h>
#include <libgnomeui/gnome-canvas-text.h>
#include <libgnome/gnome-i18n.h>
#include "weekday-picker.h"



#define PADDING 2

/* Private part of the WeekdayPicker structure */
struct _WeekdayPickerPrivate {
    /* Selected days; see weekday_picker_set_days() */
    guint8 day_mask;

    /* Metrics */
    int font_ascent, font_descent;
    int max_letter_width;

    /* Components */
    GnomeCanvasItem *boxes[7];
    GnomeCanvasItem *labels[7];

    /* Whether the week starts on Monday or Sunday */
    guint week_starts_on_monday : 1;
};



/* Signal IDs */
enum {
    CHANGED,
    LAST_SIGNAL
};

static void weekday_picker_class_init (WeekdayPickerClass *class);
static void weekday_picker_init (WeekdayPicker *wp);
static void weekday_picker_finalize (GtkObject *object);

static void weekday_picker_realize (GtkWidget *widget);
static void weekday_picker_size_request (GtkWidget *widget, GtkRequisition *requisition);
static void weekday_picker_size_allocate (GtkWidget *widget, GtkAllocation *allocation);
static void weekday_picker_style_set (GtkWidget *widget, GtkStyle *previous_style);

static GnomeCanvasClass *parent_class;

static guint wp_signals[LAST_SIGNAL];



/**
 * weekday_picker_get_type:
 * 
 * Registers the #WeekdayPicker class if necessary, and returns the type ID
 * associated to it.
 * 
 * Return value: The type ID of the #WeekdayPicker class.
 **/
GtkType
weekday_picker_get_type (void)
{
    static GtkType weekday_picker_type = 0;

    if (!weekday_picker_type) {
        static const GtkTypeInfo weekday_picker_info = {
            "WeekdayPicker",
            sizeof (WeekdayPicker),
            sizeof (WeekdayPickerClass),
            (GtkClassInitFunc) weekday_picker_class_init,
            (GtkObjectInitFunc) weekday_picker_init,
            NULL, /* reserved_1 */
            NULL, /* reserved_2 */
            (GtkClassInitFunc) NULL
        };

        weekday_picker_type = gtk_type_unique (GNOME_TYPE_CANVAS, &weekday_picker_info);
    }

    return weekday_picker_type;
}

/* Class initialization function for the weekday picker */
static void
weekday_picker_class_init (WeekdayPickerClass *class)
{
    GtkObjectClass *object_class;
    GtkWidgetClass *widget_class;

    object_class = (GtkObjectClass *) class;
    widget_class = (GtkWidgetClass *) class;

    parent_class = gtk_type_class (GNOME_TYPE_CANVAS);

    wp_signals[CHANGED] =
        gtk_signal_new ("changed",
                GTK_RUN_FIRST,
                object_class->type,
                GTK_SIGNAL_OFFSET (WeekdayPickerClass, changed),
                gtk_marshal_NONE__NONE,
                GTK_TYPE_NONE, 0);

    gtk_object_class_add_signals (object_class, wp_signals, LAST_SIGNAL);

    object_class->finalize = weekday_picker_finalize;

    widget_class->realize = weekday_picker_realize;
    widget_class->size_request = weekday_picker_size_request;
    widget_class->size_allocate = weekday_picker_size_allocate;
    widget_class->style_set = weekday_picker_style_set;

    class->changed = NULL;
}

/* Event handler for the day items */
static gint
day_event_cb (GnomeCanvasItem *item, GdkEvent *event, gpointer data)
{
    WeekdayPicker *wp;
    WeekdayPickerPrivate *priv;
    int i;
    guint8 day_mask;

    wp = WEEKDAY_PICKER (data);
    priv = wp->priv;

    if (!(event->type == GDK_BUTTON_PRESS && event->button.button == 1))
        return FALSE;

    /* Find which box was clicked */

    for (i = 0; i < 7; i++)
        if (priv->boxes[i] == item || priv->labels[i] == item)
            break;

    g_assert (i != 7);

    /* Turn on that day */

    if (priv->week_starts_on_monday) {
        if (i == 6)
            i = 0;
        else
            i++;
    }

    if (priv->day_mask & (0x1 << i))
        day_mask = priv->day_mask & ~(0x1 << i);
    else
        day_mask = priv->day_mask | (0x1 << i);

    weekday_picker_set_days (wp, day_mask);

    return TRUE;
}


/* Creates the canvas items for the weekday picker.  The items are empty until
 * they are configured elsewhere.
 */
static void
create_items (WeekdayPicker *wp)
{
    WeekdayPickerPrivate *priv;
    GnomeCanvasGroup *parent;
    int i;

    priv = wp->priv;

    parent = gnome_canvas_root (GNOME_CANVAS (wp));

    for (i = 0; i < 7; i++) {
        priv->boxes[i] = gnome_canvas_item_new (parent,
                            GNOME_TYPE_CANVAS_RECT,
                            NULL);
        gtk_signal_connect (GTK_OBJECT (priv->boxes[i]), "event",
                    GTK_SIGNAL_FUNC (day_event_cb),
                    wp);

        priv->labels[i] = gnome_canvas_item_new (parent,
                             GNOME_TYPE_CANVAS_TEXT,
                             NULL);
        gtk_signal_connect (GTK_OBJECT (priv->labels[i]), "event",
                    GTK_SIGNAL_FUNC (day_event_cb),
                    wp);
    }
}

/* Object initialization function for the weekday picker */
static void
weekday_picker_init (WeekdayPicker *wp)
{
    WeekdayPickerPrivate *priv;

    priv = g_new0 (WeekdayPickerPrivate, 1);

    wp->priv = priv;

    create_items (wp);
}

/* Finalize handler for the weekday picker */
static void
weekday_picker_finalize (GtkObject *object)
{
    WeekdayPicker *wp;
    WeekdayPickerPrivate *priv;

    g_return_if_fail (object != NULL);
    g_return_if_fail (IS_WEEKDAY_PICKER (object));

    wp = WEEKDAY_PICKER (object);
    priv = wp->priv;

    g_free (priv);
    wp->priv = NULL;

    if (GTK_OBJECT_CLASS (parent_class)->finalize)
        (* GTK_OBJECT_CLASS (parent_class)->finalize) (object);
}

static void
colorize_items (WeekdayPicker *wp)
{
    WeekdayPickerPrivate *priv;
    GdkColor *outline;
    GdkColor *fill, *sel_fill;
    GdkColor *text_fill, *sel_text_fill;
    int i;

    priv = wp->priv;

    outline = &GTK_WIDGET (wp)->style->fg[GTK_WIDGET_STATE (wp)];

    fill = &GTK_WIDGET (wp)->style->base[GTK_WIDGET_STATE (wp)];
    text_fill = &GTK_WIDGET (wp)->style->fg[GTK_WIDGET_STATE (wp)];

    sel_fill = &GTK_WIDGET (wp)->style->bg[GTK_STATE_SELECTED];
    sel_text_fill = &GTK_WIDGET (wp)->style->fg[GTK_STATE_SELECTED];

    if (priv->week_starts_on_monday) {
        GdkColor *f, *t;

        for (i = 1; i < 7; i++) {
            if (priv->day_mask & (0x1 << i)) {
                f = sel_fill;
                t = sel_text_fill;
            } else {
                f = fill;
                t = text_fill;
            }

            gnome_canvas_item_set (priv->boxes[i - 1],
                           "fill_color_gdk", f,
                           "outline_color_gdk", outline,
                           NULL);

            gnome_canvas_item_set (priv->labels[i - 1],
                           "fill_color_gdk", t,
                           NULL);
        }

        if (priv->day_mask & (0x1 << 0)) {
            f = sel_fill;
            t = sel_text_fill;
        } else {
            f = fill;
            t = text_fill;
        }
        
        gnome_canvas_item_set (priv->boxes[6],
                       "fill_color_gdk", f,
                       "outline_color_gdk", outline,
                       NULL);

        gnome_canvas_item_set (priv->labels[6],
                       "fill_color_gdk", t,
                       NULL);
    } else {
        GdkColor *f, *t;

        for (i = 0; i < 7; i++) {
            if (priv->day_mask & (0x1 << i)) {
                f = sel_fill;
                t = sel_text_fill;
            } else {
                f = fill;
                t = text_fill;
            }

            gnome_canvas_item_set (priv->boxes[i],
                           "fill_color_gdk", f,
                           "outline_color_gdk", outline,
                           NULL);

            gnome_canvas_item_set (priv->labels[i],
                           "fill_color_gdk", t,
                           NULL);
        }
    }
}

/* Configures the items in the weekday picker by setting their attributes. */
static void
configure_items (WeekdayPicker *wp)
{
    WeekdayPickerPrivate *priv;
    int width, height;
    int box_width;
    const char *str;
    int i;

    priv = wp->priv;

    width = GTK_WIDGET (wp)->allocation.width;
    height = GTK_WIDGET (wp)->allocation.height;

    box_width = (width - 1) / 7;

    if (priv->week_starts_on_monday)
        str = _("MTWTFSS");
    else
        str = _("SMTWTFS");

    for (i = 0; i < 7; i++) {
        char *c;

        gnome_canvas_item_set (priv->boxes[i],
                       "x1", (double) (i * box_width),
                       "y1", (double) 0,
                       "x2", (double) ((i + 1) * box_width),
                       "y2", (double) (height - 1),
                       "width_pixels", 0,
                       NULL);

        c = g_strndup (str + i, 1);
        gnome_canvas_item_set (priv->labels[i],
                       "text", c,
                       "font_gdk", GTK_WIDGET (wp)->style->font,
                       "x", (double) (i * box_width) + box_width / 2.0,
                       "y", (double) (1 + PADDING),
                       "anchor", GTK_ANCHOR_N,
                       NULL);
        g_free (c);
    }

    colorize_items (wp);
}

/* Realize handler for the weekday picker */
static void
weekday_picker_realize (GtkWidget *widget)
{
    WeekdayPicker *wp;

    wp = WEEKDAY_PICKER (widget);

    if (GTK_WIDGET_CLASS (parent_class)->realize)
        (* GTK_WIDGET_CLASS (parent_class)->realize) (widget);

    configure_items (wp);
}

/* Size_request handler for the weekday picker */
static void
weekday_picker_size_request (GtkWidget *widget, GtkRequisition *requisition)
{
    WeekdayPicker *wp;
    WeekdayPickerPrivate *priv;

    wp = WEEKDAY_PICKER (widget);
    priv = wp->priv;

    requisition->width = (priv->max_letter_width + 2 * PADDING + 1) * 7 + 1;
    requisition->height = (priv->font_ascent + priv->font_descent + 2 * PADDING + 2);
}

/* Size_allocate handler for the weekday picker */
static void
weekday_picker_size_allocate (GtkWidget *widget, GtkAllocation *allocation)
{
    WeekdayPicker *wp;

    wp = WEEKDAY_PICKER (widget);

    if (GTK_WIDGET_CLASS (parent_class)->size_allocate)
        (* GTK_WIDGET_CLASS (parent_class)->size_allocate) (widget, allocation);

    gnome_canvas_set_scroll_region (GNOME_CANVAS (wp),
                    0, 0, allocation->width, allocation->height);

    configure_items (wp);
}

/* Style_set handler for the weekday picker */
static void
weekday_picker_style_set (GtkWidget *widget, GtkStyle *previous_style)
{
    WeekdayPicker *wp;
    WeekdayPickerPrivate *priv;
    int max_width;
    const char *str;
    int i, len;

    wp = WEEKDAY_PICKER (widget);
    priv = wp->priv;

    priv->font_ascent = widget->style->font->ascent;
    priv->font_descent = widget->style->font->descent;

    max_width = 0;

    str = _("SMTWTFS");
    len = strlen (str);

    for (i = 0; i < len; i++) {
        int w;

        w = gdk_char_measure (widget->style->font, str[i]);
        if (w > max_width)
            max_width = w;
    }

    priv->max_letter_width = max_width;

    configure_items (wp);

    if (GTK_WIDGET_CLASS (parent_class)->style_set)
        (* GTK_WIDGET_CLASS (parent_class)->style_set) (widget, previous_style);
}



/**
 * weekday_picker_new:
 * @void: 
 * 
 * Creates a new weekday picker widget.
 * 
 * Return value: A newly-created weekday picker.
 **/
GtkWidget *
weekday_picker_new (void)
{
    return gtk_type_new (TYPE_WEEKDAY_PICKER);
}

/**
 * weekday_picker_set_days:
 * @wp: A weekday picker.
 * @day_mask: Bitmask with the days to be selected.
 * 
 * Sets the days that are selected in a weekday picker.  In the @day_mask,
 * Sunday is bit 0, Monday is bit 1, etc.
 **/
void
weekday_picker_set_days (WeekdayPicker *wp, guint8 day_mask)
{
    WeekdayPickerPrivate *priv;

    g_return_if_fail (wp != NULL);
    g_return_if_fail (IS_WEEKDAY_PICKER (wp));

    priv = wp->priv;

    priv->day_mask = day_mask;
    colorize_items (wp);

    gtk_signal_emit (GTK_OBJECT (wp), wp_signals[CHANGED]);
}

/**
 * weekday_picker_get_days:
 * @wp: A weekday picker.
 * 
 * Queries the days that are selected in a weekday picker.
 * 
 * Return value: Bit mask of selected days.  Sunday is bit 0, Monday is bit 1,
 * etc.
 **/
guint8
weekday_picker_get_days (WeekdayPicker *wp)
{
    WeekdayPickerPrivate *priv;

    g_return_val_if_fail (wp != NULL, 0);
    g_return_val_if_fail (IS_WEEKDAY_PICKER (wp), 0);

    priv = wp->priv;
    return priv->day_mask;
}

/**
 * weekday_picker_set_week_starts_on_monday:
 * @wp: A weekday picker.
 * @on_monday: Whether weeks start on Monday.
 * 
 * Sets whether a weekday picker should display weeks as starting on monday.
 * The default setting is to make Sunday the first day of the week.
 **/
void
weekday_picker_set_week_starts_on_monday (WeekdayPicker *wp, gboolean on_monday)
{
    WeekdayPickerPrivate *priv;

    g_return_if_fail (wp != NULL);
    g_return_if_fail (IS_WEEKDAY_PICKER (wp));

    priv = wp->priv;
    priv->week_starts_on_monday = on_monday ? TRUE : FALSE;

    configure_items (wp);
}

/**
 * weekday_picker_get_week_starts_on_monday:
 * @wp: A weekday picker.
 * 
 * Queries whether a weekday picker is set to show weeks as starting on Monday.
 * 
 * Return value: TRUE if weeks start on monday, FALSE if on Sunday.
 **/
gboolean
weekday_picker_get_week_starts_on_monday (WeekdayPicker *wp)
{
    WeekdayPickerPrivate *priv;

    g_return_val_if_fail (wp != NULL, FALSE);
    g_return_val_if_fail (IS_WEEKDAY_PICKER (wp), FALSE);

    priv = wp->priv;
    return priv->week_starts_on_monday;
}