New widget to pick weekdays.

2000-10-06  Federico Mena Quintero  <federico@helixcode.com>

	* gui/weekday-picker.[ch]: New widget to pick weekdays.

svn path=/trunk/; revision=5774

1 files changed, 536 insertions, 0 deletions

diff --git a/calendar/gui/weekday-picker.c b/calendar/gui/weekday-picker.c
new file mode 100644
index 0000000000..1898ebc2b8
--- /dev/null
+++ b/calendar/gui/weekday-picker.c
@@ -0,0 +1,536 @@
+/* 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;
+};
+
+
+
+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;
+
+
+
+/**
+ * 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);
+
+	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;
+}
+
+/* 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_gc[GTK_WIDGET_STATE (wp)];
+
+	sel_fill = &GTK_WIDGET (wp)->style->bg[GTK_STATE_SELECTED];
+	sel_text_fill = &GTK_WIDGET (wp)->style->fg_gc[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);
+}
+
+/**
+ * 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;
+}