path: root/calendar/gncal-full-day.c

/* Full day widget for gncal
 *
 * Copyright (C) 1998 The Free Software Foundation
 *
 * Author: Federico Mena <federico@nuclecu.unam.mx>
 */

#include <gtk/gtkdrawingarea.h>
#include <gtk/gtktext.h>
#include "gncal-full-day.h"
#include "view-utils.h"


#define TEXT_BORDER 2
#define HANDLE_SIZE 3
#define MIN_WIDTH 200
#define XOR_RECT_WIDTH 2


typedef struct {
    iCalObject *ico;
    GtkWidget  *widget;
    GdkWindow  *window;
    int         lower_row; /* zero is first displayed row */
    int         rows_used;
    int         x;         /* coords of child's window */
    int         y;
    int         width;
    int         height;
} Child;

struct layout_row {
    int  intersections;
    int *slots;
};

struct drag_info {
    Child *child;
    enum {
        DRAG_MOVE,
        DRAG_SIZE
    } drag_mode;
    int new_y;
    int new_height;
};


static void gncal_full_day_class_init     (GncalFullDayClass *class);
static void gncal_full_day_init           (GncalFullDay      *fullday);
static void gncal_full_day_destroy        (GtkObject         *object);
static void gncal_full_day_map            (GtkWidget         *widget);
static void gncal_full_day_unmap          (GtkWidget         *widget);
static void gncal_full_day_realize        (GtkWidget         *widget);
static void gncal_full_day_unrealize      (GtkWidget         *widget);
static void gncal_full_day_draw           (GtkWidget         *widget,
                       GdkRectangle      *area);
static void gncal_full_day_size_request   (GtkWidget         *widget,
                       GtkRequisition    *requisition);
static void gncal_full_day_size_allocate  (GtkWidget         *widget,
                       GtkAllocation     *allocation);
static gint gncal_full_day_button_press   (GtkWidget         *widget,
                       GdkEventButton    *event);
static gint gncal_full_day_button_release (GtkWidget         *widget,
                       GdkEventButton    *event);
static gint gncal_full_day_motion         (GtkWidget         *widget,
                       GdkEventMotion    *event);
static gint gncal_full_day_expose         (GtkWidget         *widget,
                       GdkEventExpose    *event);
static void gncal_full_day_foreach        (GtkContainer      *container,
                       GtkCallback        callback,
                       gpointer           callback_data);


static GtkContainerClass *parent_class;


static void
get_tm_range (GncalFullDay *fullday,
          time_t time_lower, time_t time_upper,
          struct tm *lower, struct tm *upper,
          int *lower_row, int *rows_used)
{
    struct tm tm_lower, tm_upper;
    int lmin, umin;
    int lrow;

    /* Lower */

    tm_lower = *localtime (&time_lower);

    if ((tm_lower.tm_min % fullday->interval) != 0) {
        tm_lower.tm_min -= tm_lower.tm_min % fullday->interval; /* round down */
        mktime (&tm_lower);
    }

    /* Upper */

    tm_upper = *localtime (&time_upper);

    if ((tm_upper.tm_min % fullday->interval) != 0) {
        tm_upper.tm_min += fullday->interval - (tm_upper.tm_min % fullday->interval); /* round up */
        mktime (&tm_upper);
    }

    if (lower)
        *lower = tm_lower;

    if (upper)
        *upper = tm_upper;

    lmin = 60 * tm_lower.tm_hour + tm_lower.tm_min;
    umin = 60 * tm_upper.tm_hour + tm_upper.tm_min;

    if (umin == 0) /* midnight of next day? */
        umin = 60 * 24;

    lrow = lmin / fullday->interval;

    if (lower_row)
        *lower_row = lrow;

    if (rows_used)
        *rows_used = (umin - lmin) / fullday->interval;
}

static void
child_map (GncalFullDay *fullday, Child *child)
{
    gdk_window_show (child->window);

    if (GTK_WIDGET_VISIBLE (child->widget) && !GTK_WIDGET_MAPPED (child->widget))
        gtk_widget_map (child->widget);
}

static void
child_unmap (GncalFullDay *fullday, Child *child)
{
    gdk_window_hide (child->window);

    if (GTK_WIDGET_VISIBLE (child->widget) && GTK_WIDGET_MAPPED (child->widget))
        gtk_widget_unmap (child->widget);
}

static void
child_set_text_pos (Child *child)
{
    GtkAllocation allocation;

    allocation.x = 0;
    allocation.y = HANDLE_SIZE;
    allocation.width = child->width;
    allocation.height = child->height - 2 * HANDLE_SIZE;

    gtk_widget_size_request (child->widget, &child->widget->requisition); /* FIXME: is this needed? */
    gtk_widget_size_allocate (child->widget, &allocation);
}

static void
child_realize (GncalFullDay *fullday, Child *child)
{
    GdkWindowAttr attributes;
    gint attributes_mask;
    GtkWidget *widget;

    widget = GTK_WIDGET (fullday);

    attributes.window_type = GDK_WINDOW_CHILD;
    attributes.x = child->x;
    attributes.y = child->y;
    attributes.width = child->width;
    attributes.height = child->height;
    attributes.wclass = GDK_INPUT_OUTPUT;
    attributes.visual = gtk_widget_get_visual (widget);
    attributes.colormap = gtk_widget_get_colormap (widget);
    attributes.cursor = fullday->up_down_cursor;
    attributes.event_mask = (GDK_EXPOSURE_MASK
                 | GDK_BUTTON_PRESS_MASK
                 | GDK_BUTTON_RELEASE_MASK
                 | GDK_BUTTON_MOTION_MASK
                 | GDK_POINTER_MOTION_HINT_MASK);

    attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP | GDK_WA_CURSOR;

    child->window = gdk_window_new (widget->window, &attributes, attributes_mask);
    gdk_window_set_user_data (child->window, widget);

    gtk_style_set_background (widget->style, child->window, GTK_STATE_NORMAL);

    gtk_widget_set_parent_window (child->widget, child->window);

    child_set_text_pos (child);
}

static void
child_unrealize (GncalFullDay *fullday, Child *child)
{
    gdk_window_set_user_data (child->window, NULL);
    gdk_window_destroy (child->window);
    child->window = NULL;
}

static void
child_draw (GncalFullDay *fullday, Child *child, GdkRectangle *area, int draw_child)
{
    GdkRectangle arect, rect, dest;
    gint w, h;

    gdk_window_get_size (child->window, &w, &h);

    if (!area) {
        arect.x = 0;
        arect.y = 0;

        arect.width = w;
        arect.height = h;

        area = &arect;
    }

    /* Top handle */

    rect.x = 0;
    rect.y = 0;
    rect.width = w;
    rect.height = HANDLE_SIZE;

    if (gdk_rectangle_intersect (&rect, area, &dest))
        view_utils_draw_textured_frame (GTK_WIDGET (fullday), child->window, &rect, GTK_SHADOW_OUT);

    /* Bottom handle */

    rect.y = h - HANDLE_SIZE;

    if (gdk_rectangle_intersect (&rect, area, &dest))
        view_utils_draw_textured_frame (GTK_WIDGET (fullday), child->window, &rect, GTK_SHADOW_OUT);

    if (draw_child) {
        area->y -= HANDLE_SIZE;
        gtk_widget_draw (child->widget, area);
    }
}

static void
child_realized_setup (GtkWidget *widget, gpointer data)
{
    Child *child;
    GncalFullDay *fullday;

    child = data;
    fullday = GNCAL_FULL_DAY (widget->parent);

    gdk_window_set_cursor (widget->window, fullday->beam_cursor);

    gtk_text_insert (GTK_TEXT (widget), NULL, NULL, NULL,
             child->ico->summary,
             strlen (child->ico->summary));
}

static gint
child_focus_out (GtkWidget *widget, GdkEventFocus *event, gpointer data)
{
    Child *child;

    child = data;

    if (child->ico->summary)
        g_free (child->ico->summary);

    child->ico->summary = gtk_editable_get_chars (GTK_EDITABLE (widget), 0, -1);

    return FALSE;
}

static Child *
child_new (GncalFullDay *fullday, iCalObject *ico)
{
    Child *child;
    struct tm start, end;
    int lower_row, rows_used;
    int f_lower_row;

    child = g_new (Child, 1);

    child->ico = ico;
    child->widget = gtk_text_new (NULL, NULL);
    child->window = NULL;
    child->x = 0;
    child->y = 0;
    child->width = 0;
    child->height = 0;

    /* Calc display range for event */

    get_tm_range (fullday, child->ico->dtstart, child->ico->dtend, &start, &end, &lower_row, &rows_used);
    get_tm_range (fullday, fullday->lower, fullday->upper, NULL, NULL, &f_lower_row, NULL);

    child->lower_row = lower_row - f_lower_row;
    child->rows_used = rows_used;

    /* We set the i-beam cursor and the initial summary text upon realization */

    gtk_signal_connect (GTK_OBJECT (child->widget), "realize",
                (GtkSignalFunc) child_realized_setup,
                child);

    /* Update the iCalObject summary when the text widget loses focus */

    gtk_signal_connect (GTK_OBJECT (child->widget), "focus_out_event",
                (GtkSignalFunc) child_focus_out,
                child);

    /* Finish setup */

    gtk_text_set_editable (GTK_TEXT (child->widget), TRUE);
    gtk_text_set_word_wrap (GTK_TEXT (child->widget), TRUE);

    gtk_widget_set_parent (child->widget, GTK_WIDGET (fullday));
    gtk_widget_show (child->widget);

    return child;
}

static void
child_destroy (GncalFullDay *fullday, Child *child)
{
    /* FIXME */
}

static void
child_set_pos (GncalFullDay *fullday, Child *child, int x, int y, int width, int height)
{
    child->x = x;
    child->y = y;
    child->width = width;
    child->height = height;

    if (!GTK_WIDGET_REALIZED (fullday))
        return;

    child_set_text_pos (child);
    gdk_window_move_resize (child->window, x, y, width, height);
}

static struct layout_row *
layout_get_rows (GncalFullDay *fullday)
{
    struct layout_row *rows;
    int max_i;
    int f_rows;
    GList *children;
    Child *child;
    int i, n;

    get_tm_range (fullday, fullday->lower, fullday->upper, NULL, NULL, NULL, &f_rows);

    rows = g_new0 (struct layout_row, f_rows);
    max_i = 0;

    for (children = fullday->children; children; children = children->next) {
        child = children->data;

        for (i = 0; i < child->rows_used; i++) {
            n = child->lower_row + i;

            rows[n].intersections++;
            
            if (rows[n].intersections > max_i)
                max_i = rows[n].intersections;
        }
    }

    for (i = 0; i < f_rows; i++)
        rows[i].slots = g_new0 (int, max_i);

    return rows;
}

static void
layout_get_child_intersections (Child *child, struct layout_row *rows, int *min, int *max)
{
    int i, n;
    int imin, imax;

    imax = 0;

    for (i = 0; i < child->rows_used; i++) {
        n = child->lower_row + i;

        if (rows[n].intersections > imax)
            imax = rows[n].intersections;
    }

    imin = imax;

    for (i = 0; i < child->rows_used; i++) {
        n = child->lower_row + i;

        if (rows[n].intersections < imin)
            imin = rows[n].intersections;
    }

    if (min)
        *min = imin;

    if (max)
        *max = imax;
}

static int
calc_labels_width (GncalFullDay *fullday)
{
    struct tm cur, upper;
    time_t tim, time_upper;
    int width, max_w;
    char buf[256];

    get_tm_range (fullday, fullday->lower, fullday->upper, &cur, &upper, NULL, NULL);

    max_w = 0;

    tim = mktime (&cur);
    time_upper = mktime (&upper);

    while (tim < time_upper) {
        strftime (buf, 256, "%X", &cur);

        width = gdk_string_width (GTK_WIDGET (fullday)->style->font, buf);

        if (width > max_w)
            max_w = width;

        cur.tm_min += fullday->interval;
        tim = mktime (&cur);
    }

    return max_w;
}

static void
layout_child (GncalFullDay *fullday, Child *child, struct layout_row *rows)
{
    int c_x, c_y, c_width, c_height;
    GtkWidget *widget;
    int labels_width;
    int height, f_rows;
    int row_height;

    /* Calculate child position */

    widget = GTK_WIDGET (fullday);

    labels_width = calc_labels_width (fullday); /* FIXME: this is expensive to do for each child */

    get_tm_range (fullday, fullday->lower, fullday->upper, NULL, NULL, NULL, &f_rows);

    height = widget->allocation.height - 2 * widget->style->klass->ythickness;
    row_height = height / f_rows;

    c_x = 2 * (widget->style->klass->xthickness + TEXT_BORDER) + labels_width;
    c_y = widget->style->klass->ythickness;

    /* FIXME: for now, the children overlap.  Make it layout them nicely. */

    c_width = widget->allocation.width - (widget->style->klass->xthickness + c_x);

    c_y += child->lower_row * row_height;
    c_height = child->rows_used * row_height;

    /* Position child */

    child_set_pos (fullday, child, c_x, c_y, c_width, c_height);
}

static void
layout_children (GncalFullDay *fullday)
{
    struct layout_row *rows;
    GList *children;

    rows = layout_get_rows (fullday);

    for (children = fullday->children; children; children = children->next)
        layout_child (fullday, children->data, rows);

    g_free (rows);
}

guint
gncal_full_day_get_type (void)
{
    static guint full_day_type = 0;

    if (!full_day_type) {
        GtkTypeInfo full_day_info = {
            "GncalFullDay",
            sizeof (GncalFullDay),
            sizeof (GncalFullDayClass),
            (GtkClassInitFunc) gncal_full_day_class_init,
            (GtkObjectInitFunc) gncal_full_day_init,
            (GtkArgSetFunc) NULL,
            (GtkArgGetFunc) NULL
        };

        full_day_type = gtk_type_unique (gtk_container_get_type (), &full_day_info);
    }

    return full_day_type;
}

static void
gncal_full_day_class_init (GncalFullDayClass *class)
{
    GtkObjectClass    *object_class;
    GtkWidgetClass    *widget_class;
    GtkContainerClass *container_class;

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

    parent_class = gtk_type_class (gtk_container_get_type ());

    object_class->destroy = gncal_full_day_destroy;

    widget_class->map = gncal_full_day_map;
    widget_class->unmap = gncal_full_day_unmap;
    widget_class->realize = gncal_full_day_realize;
    widget_class->unrealize = gncal_full_day_unrealize;
    widget_class->draw = gncal_full_day_draw;
    widget_class->size_request = gncal_full_day_size_request;
    widget_class->size_allocate = gncal_full_day_size_allocate;
    widget_class->button_press_event = gncal_full_day_button_press;
    widget_class->button_release_event = gncal_full_day_button_release;
    widget_class->motion_notify_event = gncal_full_day_motion;
    widget_class->expose_event = gncal_full_day_expose;

    container_class->foreach = gncal_full_day_foreach;
}

static void
gncal_full_day_init (GncalFullDay *fullday)
{
    GTK_WIDGET_UNSET_FLAGS (fullday, GTK_NO_WINDOW);

    fullday->calendar = NULL;

    fullday->lower = 0;
    fullday->upper = 0;
    fullday->interval = 30; /* 30 minutes by default */

    fullday->children = NULL;
    fullday->drag_info = g_new (struct drag_info, 1);

    fullday->up_down_cursor = NULL;
    fullday->beam_cursor = NULL;
}

static void
gncal_full_day_destroy (GtkObject *object)
{
    GncalFullDay *fullday;

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

    fullday = GNCAL_FULL_DAY (object);

    g_list_free (fullday->children);
    g_free (fullday->drag_info);

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

GtkWidget *
gncal_full_day_new (GnomeCalendar *calendar, time_t lower, time_t upper)
{
    GncalFullDay *fullday;

    g_return_val_if_fail (calendar != NULL, NULL);

    fullday = gtk_type_new (gncal_full_day_get_type ());

    fullday->calendar = calendar;

    gncal_full_day_set_bounds (fullday, lower, upper);

    return GTK_WIDGET (fullday);
}

static void
gncal_full_day_map (GtkWidget *widget)
{
    GncalFullDay *fullday;
    GList *children;

    g_return_if_fail (widget != NULL);
    g_return_if_fail (GNCAL_IS_FULL_DAY (widget));

    GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);

    fullday = GNCAL_FULL_DAY (widget);

    gdk_window_show (widget->window);

    for (children = fullday->children; children; children = children->next)
        child_map (fullday, children->data);
}

static void
gncal_full_day_unmap (GtkWidget *widget)
{
    GncalFullDay *fullday;
    GList *children;

    g_return_if_fail (widget != NULL);
    g_return_if_fail (GNCAL_IS_FULL_DAY (widget));

    GTK_WIDGET_UNSET_FLAGS (widget, GTK_MAPPED);

    fullday = GNCAL_FULL_DAY (widget);

    gdk_window_hide (widget->window);

    for (children = fullday->children; children; children = children->next)
        child_unmap (fullday, children->data);
}

static void
gncal_full_day_realize (GtkWidget *widget)
{
    GncalFullDay *fullday;
    GdkWindowAttr attributes;
    gint attributes_mask;
    GList *children;

    g_return_if_fail (widget != NULL);
    g_return_if_fail (GNCAL_IS_FULL_DAY (widget));

    GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);

    fullday = GNCAL_FULL_DAY (widget);

    attributes.window_type = GDK_WINDOW_CHILD;
    attributes.x = widget->allocation.x;
    attributes.y = widget->allocation.y;
    attributes.width = widget->allocation.width;
    attributes.height = widget->allocation.height;
    attributes.wclass = GDK_INPUT_OUTPUT;
    attributes.visual = gtk_widget_get_visual (widget);
    attributes.colormap = gtk_widget_get_colormap (widget);
    attributes.event_mask = (gtk_widget_get_events (widget)
                 | GDK_EXPOSURE_MASK);

    attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;

    widget->window = gdk_window_new (gtk_widget_get_parent_window (widget), &attributes, attributes_mask);
    gdk_window_set_user_data (widget->window, widget);

    widget->style = gtk_style_attach (widget->style, widget->window);
    gdk_window_set_background (widget->window, &widget->style->bg[GTK_STATE_PRELIGHT]);

    fullday->up_down_cursor = gdk_cursor_new (GDK_DOUBLE_ARROW);
    fullday->beam_cursor = gdk_cursor_new (GDK_XTERM);

    for (children = fullday->children; children; children = children->next)
        child_realize (fullday, children->data);
}

static void
gncal_full_day_unrealize (GtkWidget *widget)
{
    GncalFullDay *fullday;
    GList *children;

    g_return_if_fail (widget != NULL);
    g_return_if_fail (GNCAL_IS_FULL_DAY (widget));

    fullday = GNCAL_FULL_DAY (widget);

    for (children = fullday->children; children; children = children->next)
        child_unrealize (fullday, children->data);

    gdk_cursor_destroy (fullday->up_down_cursor);
    fullday->up_down_cursor = NULL;

    gdk_cursor_destroy (fullday->beam_cursor);
    fullday->beam_cursor = NULL;

    if (GTK_WIDGET_CLASS (parent_class)->unrealize)
        (* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
}

static void
gncal_full_day_draw (GtkWidget *widget, GdkRectangle *area)
{
    GncalFullDay *fullday;

    g_return_if_fail (widget != NULL);
    g_return_if_fail (GNCAL_IS_FULL_DAY (widget));
    g_return_if_fail (area != NULL);

    if (!GTK_WIDGET_DRAWABLE (widget))
        return;

    fullday = GNCAL_FULL_DAY (widget);

    /* FIXME */
}

static void
gncal_full_day_size_request (GtkWidget *widget, GtkRequisition *requisition)
{
    GncalFullDay *fullday;
    int labels_width;
    int rows;

    g_return_if_fail (widget != NULL);
    g_return_if_fail (GNCAL_IS_FULL_DAY (widget));
    g_return_if_fail (requisition != NULL);

    fullday = GNCAL_FULL_DAY (widget);

    /* Border and min width */

    labels_width = calc_labels_width (fullday);

    requisition->width = 2 * widget->style->klass->xthickness + 4 * TEXT_BORDER + labels_width + MIN_WIDTH;
    requisition->height = 2 * widget->style->klass->ythickness;

    /* Rows */

    get_tm_range (fullday, fullday->lower, fullday->upper, NULL, NULL, NULL, &rows);

    requisition->height += (rows * (2 * TEXT_BORDER + widget->style->font->ascent + widget->style->font->descent)
                + (rows - 1)); /* division lines */
}

static void
gncal_full_day_size_allocate (GtkWidget *widget, GtkAllocation *allocation)
{
    GncalFullDay *fullday;

    g_return_if_fail (widget != NULL);
    g_return_if_fail (GNCAL_IS_FULL_DAY (widget));
    g_return_if_fail (allocation != NULL);

    widget->allocation = *allocation;

    fullday = GNCAL_FULL_DAY (widget);

    if (GTK_WIDGET_REALIZED (widget))
        gdk_window_move_resize (widget->window,
                    allocation->x, allocation->y,
                    allocation->width, allocation->height);

    layout_children (fullday);
}

static Child *
find_child_by_window (GncalFullDay *fullday, GdkWindow *window)
{
    GList *children;
    Child *child;

    for (children = fullday->children; children; children = children->next) {
        child = children->data;

        if (child->window == window)
            return child;
    }

    return NULL;
}

static void
draw_xor_rect (GncalFullDay *fullday)
{
    GtkWidget *widget;
    struct drag_info *di;
    int i;

    widget = GTK_WIDGET (fullday);

    gdk_gc_set_function (widget->style->white_gc, GDK_INVERT);
    gdk_gc_set_subwindow (widget->style->white_gc, GDK_INCLUDE_INFERIORS);

    di = fullday->drag_info;

    for (i = 0; i < XOR_RECT_WIDTH; i++)
        gdk_draw_rectangle (widget->window,
                    widget->style->white_gc,
                    FALSE,
                    di->child->x + i,
                    di->new_y + i,
                    di->child->width - 2 * i - 1,
                    di->new_height - 2 * i - 2);

    gdk_gc_set_function (widget->style->white_gc, GDK_COPY);
    gdk_gc_set_subwindow (widget->style->white_gc, GDK_CLIP_BY_CHILDREN);
}

static gint
gncal_full_day_button_press (GtkWidget *widget, GdkEventButton *event)
{
    GncalFullDay *fullday;
    Child *child;
    struct drag_info *di;
    gint y;

    g_return_val_if_fail (widget != NULL, FALSE);
    g_return_val_if_fail (GNCAL_IS_FULL_DAY (widget), FALSE);
    g_return_val_if_fail (event != NULL, FALSE);

    fullday = GNCAL_FULL_DAY (widget);

    if (event->window == widget->window)
        return FALSE; /* FIXME: do range selection thing */
    else {
        child = find_child_by_window (fullday, event->window);

        if (!child)
            return FALSE;

        di = fullday->drag_info;

        di->child = child;

        gtk_widget_get_pointer (widget, NULL, &y);

        if (event->y < HANDLE_SIZE)
            di->drag_mode = DRAG_MOVE;
        else
            di->drag_mode = DRAG_SIZE;

        di->new_y = child->y;
        di->new_height = child->height;

        gdk_pointer_grab (child->window, FALSE,
                  (GDK_BUTTON_MOTION_MASK
                   | GDK_POINTER_MOTION_HINT_MASK
                   | GDK_BUTTON_RELEASE_MASK),
                  NULL,
                  NULL,
                  event->time);

        draw_xor_rect (fullday);
    }

    return FALSE;
}

static void
recompute_motion (GncalFullDay *fullday, int y)
{
    GtkWidget *widget;
    struct drag_info *di;
    int rows, row_height;
    int ythickness;

    widget = GTK_WIDGET (fullday);

    get_tm_range (fullday, fullday->lower, fullday->upper, NULL, NULL, NULL, &rows);

    ythickness = widget->style->klass->ythickness;

    row_height = (widget->allocation.height - 2 * ythickness) / rows;

    y -= ythickness;
    y = (y + row_height / 2) / row_height; /* round to nearest bound */
    y = y * row_height + ythickness;

    di = fullday->drag_info;

    switch (di->drag_mode) {
    case DRAG_MOVE:
        if (y < ythickness)
            y = ythickness;
        else if (y >= (ythickness + rows * row_height - di->new_height))
            y = ythickness + rows * row_height - di->new_height;

        di->new_y = y;

        break;
        
    case DRAG_SIZE:
        if (y <= di->child->y)
            y = di->child->y + row_height;
        else if (y >= (ythickness + rows * row_height))
            y = ythickness + rows * row_height;

        di->new_height = y - di->new_y;

        break;

    default:
        g_assert_not_reached ();
    }
}

static void
update_from_drag_info (GncalFullDay *fullday)
{
    struct drag_info *di;
    GtkWidget *widget;
    struct tm tm;
    int f_rows;
    int row_height;
    int start_row, used_rows;

    di = fullday->drag_info;

    widget = GTK_WIDGET (fullday);

    get_tm_range (fullday, fullday->lower, fullday->upper, &tm, NULL, NULL, &f_rows);

    row_height = (widget->allocation.height - 2 * widget->style->klass->ythickness) / f_rows;

    start_row = (di->new_y - widget->style->klass->ythickness) / row_height;
    used_rows = di->new_height / row_height;

    tm.tm_min += fullday->interval * start_row;
    di->child->ico->dtstart = mktime (&tm);

    tm.tm_min += fullday->interval * used_rows;
    di->child->ico->dtend = mktime (&tm);

    /* FIXME: notify calendar of change */

    /* FIXME: re-layout or let notification do it? */

    layout_children (fullday);
}

static gint
gncal_full_day_button_release (GtkWidget *widget, GdkEventButton *event)
{
    GncalFullDay *fullday;
    struct drag_info *di;
    gint y;

    g_return_val_if_fail (widget != NULL, FALSE);
    g_return_val_if_fail (GNCAL_IS_FULL_DAY (widget), FALSE);
    g_return_val_if_fail (event != NULL, FALSE);

    fullday = GNCAL_FULL_DAY (widget);

    di = fullday->drag_info;

    if (!di->child || (event->window != di->child->window))
        return FALSE;

    gtk_widget_get_pointer (widget, NULL, &y);

    draw_xor_rect (fullday);
    recompute_motion (fullday, y);
    gdk_pointer_ungrab (event->time);

    update_from_drag_info (fullday);

    di->child = NULL;

    return FALSE;
}

static gint
gncal_full_day_motion (GtkWidget *widget, GdkEventMotion *event)
{
    GncalFullDay *fullday;
    struct drag_info *di;
    gint y;

    g_return_val_if_fail (widget != NULL, FALSE);
    g_return_val_if_fail (GNCAL_IS_FULL_DAY (widget), FALSE);
    g_return_val_if_fail (event != NULL, FALSE);

    fullday = GNCAL_FULL_DAY (widget);
    di = fullday->drag_info;

    if (!di->child || (event->window != di->child->window))
        return FALSE;

    gtk_widget_get_pointer (widget, NULL, &y);
    
    draw_xor_rect (fullday);
    recompute_motion (fullday, y);
    draw_xor_rect (fullday);

    return FALSE;
}

static void
paint_back (GncalFullDay *fullday, GdkRectangle *area)
{
    GtkWidget *widget;
    GdkRectangle rect, dest;
    int x1, y1, width, height;
    int labels_width, division_x;
    int rows, row_height;
    int i, y;
    struct tm tm;
    char buf[256];

    widget = GTK_WIDGET (fullday);

    x1 = widget->style->klass->xthickness;
    y1 = widget->style->klass->ythickness;
    width = widget->allocation.width - 2 * x1;
    height = widget->allocation.height - 2 * y1;

    /* Clear and paint frame shadow */

    gdk_window_clear_area (widget->window, area->x, area->y, area->width, area->height);

    gtk_draw_shadow (widget->style, widget->window,
             GTK_STATE_NORMAL, GTK_SHADOW_ETCHED_IN,
             0, 0,
             widget->allocation.width,
             widget->allocation.height);

    /* Clear space for labels */

    labels_width = calc_labels_width (fullday);

    rect.x = x1;
    rect.y = y1;
    rect.width = 2 * TEXT_BORDER + labels_width;
    rect.height = height;

    if (gdk_rectangle_intersect (&rect, area, &dest))
        gdk_draw_rectangle (widget->window,
                    widget->style->bg_gc[GTK_STATE_NORMAL],
                    TRUE,
                    dest.x, dest.y,
                    dest.width, dest.height);

    /* Vertical division */

    division_x = x1 + 2 * TEXT_BORDER + labels_width;

    gtk_draw_vline (widget->style, widget->window,
            GTK_STATE_NORMAL,
            y1,
            y1 + height - 1,
            division_x);

    /* Horizontal divisions */

    get_tm_range (fullday, fullday->lower, fullday->upper, &tm, NULL, NULL, &rows);

    row_height = height / rows; /* includes division line at bottom of row */

    y = y1 + row_height - 1;

    for (i = 1; i < rows; i++) {
        gdk_draw_line (widget->window,
                   widget->style->black_gc,
                   x1, y,
                   x1 + width - 1, y);

        y += row_height;
    }

    /* Labels */

    y = y1 + ((row_height - 1) - (widget->style->font->ascent + widget->style->font->descent)) / 2;

    rect.height = row_height - 1;

    for (i = 0; i < rows; i++) {
        mktime (&tm);

        if (gdk_rectangle_intersect (&rect, area, &dest)) {
            strftime (buf, 256, "%X", &tm);

            gdk_draw_string (widget->window,
                     widget->style->font,
                     widget->style->fg_gc[GTK_STATE_NORMAL],
                     x1 + TEXT_BORDER,
                     y + widget->style->font->ascent,
                     buf);
        }

        rect.y += row_height;
        y += row_height;

        tm.tm_min += fullday->interval;
    }
}

static gint
gncal_full_day_expose (GtkWidget *widget, GdkEventExpose *event)
{
    GncalFullDay *fullday;
    GList *children;
    Child *child;

    g_return_val_if_fail (widget != NULL, FALSE);
    g_return_val_if_fail (GNCAL_IS_FULL_DAY (widget), FALSE);
    g_return_val_if_fail (event != NULL, FALSE);

    if (!GTK_WIDGET_DRAWABLE (widget))
        return FALSE;

    fullday = GNCAL_FULL_DAY (widget);

    if (event->window == widget->window)
        paint_back (fullday, &event->area);
    else
        for (children = fullday->children; children; children = children->next) {
            child = children->data;

            if (event->window == child->window) {
                child_draw (fullday, child, &event->area, FALSE);
                break;
            }
        }

    return FALSE;
}

static void
gncal_full_day_foreach (GtkContainer *container, GtkCallback callback, gpointer callback_data)
{
    GncalFullDay *fullday;
    GList *children;
    Child *child;

    g_return_if_fail (container != NULL);
    g_return_if_fail (GNCAL_IS_FULL_DAY (container));
    g_return_if_fail (callback != NULL);

    fullday = GNCAL_FULL_DAY (container);

    for (children = fullday->children; children; children = children->next) {
        child = children->data;

        (*callback) (child->widget, callback_data);
    }
}

void
gncal_full_day_update (GncalFullDay *fullday)
{
    GList *children;
    GList *l_events, *events;
    Child *child;

    g_return_if_fail (fullday != NULL);
    g_return_if_fail (GNCAL_IS_FULL_DAY (fullday));

    if (!fullday->calendar->cal)
        return;

    l_events = calendar_get_events_in_range (fullday->calendar->cal,
                         fullday->lower,
                         fullday->upper,
                         calendar_compare_by_dtstart);

    /* FIXME: this is expensive and looks ugly -- use some form of cache? */

    for (children = fullday->children; children; children = children->next)
        child_destroy (fullday, children->data);

    g_list_free (fullday->children);

    children = NULL;

    for (events = l_events; events; events = events->next) {
        child = child_new (fullday, events->data);
        children = g_list_append (children, child);
    }

    g_list_free (l_events);

    fullday->children = g_list_first (children);

    layout_children (fullday);

    /* Realize and map children */

    for (children = fullday->children; children; children = children->next) {
        if (GTK_WIDGET_REALIZED (fullday))
            child_realize (fullday, children->data);

        if (GTK_WIDGET_MAPPED (fullday))
            child_map (fullday, children->data);
    }

    /* FIXME: paint or something */

    gtk_widget_draw (GTK_WIDGET (fullday), NULL);
}

void
gncal_full_day_set_bounds (GncalFullDay *fullday, time_t lower, time_t upper)
{
    g_return_if_fail (fullday != NULL);
    g_return_if_fail (GNCAL_IS_FULL_DAY (fullday));

    if ((lower != fullday->lower) || (upper != fullday->upper)) {
        fullday->lower = lower;
        fullday->upper = upper;

        gncal_full_day_update (fullday);
    }
}