path: root/widgets/table/e-table-field-chooser-item.c

/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) version 3.
 *
 * 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 *
 * Authors:
 *      Chris Lahey <clahey@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

#include <config.h>

#include <string.h>

#include <gtk/gtk.h>
#include <libgnomecanvas/libgnomecanvas.h>
#include <gdk-pixbuf/gdk-pixbuf.h>

#include <glib/gi18n.h>
#include "e-util/e-util.h"
#include "e-util/e-xml-utils.h"
#include "misc/e-canvas.h"

#include "e-table-col-dnd.h"
#include "e-table-defines.h"
#include "e-table-field-chooser-item.h"
#include "e-table-header-utils.h"
#include "e-table-header.h"

#define d(x)

#if 0
enum {
    BUTTON_PRESSED,
    LAST_SIGNAL
};

static guint etfci_signals[LAST_SIGNAL] = { 0, };
#endif

/* workaround for avoiding API breakage */
#define etfci_get_type e_table_field_chooser_item_get_type
G_DEFINE_TYPE (ETableFieldChooserItem, etfci, GNOME_TYPE_CANVAS_ITEM)

static void etfci_drop_table_header (ETableFieldChooserItem *etfci);
static void etfci_drop_full_header (ETableFieldChooserItem *etfci);

enum {
    PROP_0,
    PROP_FULL_HEADER,
    PROP_HEADER,
    PROP_DND_CODE,
    PROP_WIDTH,
    PROP_HEIGHT
};

static void
etfci_dispose (GObject *object)
{
    ETableFieldChooserItem *etfci = E_TABLE_FIELD_CHOOSER_ITEM (object);

    etfci_drop_table_header (etfci);
    etfci_drop_full_header (etfci);

    if (etfci->combined_header)
        g_object_unref (etfci->combined_header);
    etfci->combined_header = NULL;

    if (etfci->font_desc)
        pango_font_description_free (etfci->font_desc);
    etfci->font_desc = NULL;

    /* Chain up to parent's dispose() method. */
    G_OBJECT_CLASS (etfci_parent_class)->dispose (object);
}

static gint
etfci_find_button (ETableFieldChooserItem *etfci, gdouble loc)
{
    gint i;
    gint count;
    gdouble height = 0;

    count = e_table_header_count (etfci->combined_header);
    for (i = 0; i < count; i++) {
        ETableCol *ecol;

        ecol = e_table_header_get_column (etfci->combined_header, i);
        if (ecol->disabled)
            continue;
        height += e_table_header_compute_height (
            ecol, GTK_WIDGET (GNOME_CANVAS_ITEM (etfci)->canvas));
        if (height > loc)
            return i;
    }
    return MAX (0, count - 1);
}

static void
etfci_rebuild_combined (ETableFieldChooserItem *etfci)
{
    gint count;
    GHashTable *hash;
    gint i;

    if (etfci->combined_header != NULL)
        g_object_unref (etfci->combined_header);

    etfci->combined_header = e_table_header_new ();

    hash = g_hash_table_new (NULL, NULL);

    count = e_table_header_count (etfci->header);
    for (i = 0; i < count; i++) {
        ETableCol *ecol = e_table_header_get_column (etfci->header, i);
        if (ecol->disabled)
            continue;
        g_hash_table_insert (hash, GINT_TO_POINTER (ecol->col_idx), GINT_TO_POINTER (1));
    }

    count = e_table_header_count (etfci->full_header);
    for (i = 0; i < count; i++) {
        ETableCol *ecol = e_table_header_get_column (etfci->full_header, i);
        if (ecol->disabled)
            continue;
        if (!(GPOINTER_TO_INT (g_hash_table_lookup (hash, GINT_TO_POINTER (ecol->col_idx)))))
            e_table_header_add_column (etfci->combined_header, ecol, -1);
    }

    g_hash_table_destroy (hash);
}

static void
etfci_reflow (GnomeCanvasItem *item, gint flags)
{
    ETableFieldChooserItem *etfci = E_TABLE_FIELD_CHOOSER_ITEM (item);
    gdouble old_height;
    gint i;
    gint count;
    gdouble height = 0;

    etfci_rebuild_combined (etfci);

    old_height = etfci->height;

    count = e_table_header_count (etfci->combined_header);
    for (i = 0; i < count; i++) {
        ETableCol *ecol;

        ecol = e_table_header_get_column (etfci->combined_header, i);
        if (ecol->disabled)
            continue;
        height += e_table_header_compute_height (
            ecol, GTK_WIDGET (GNOME_CANVAS_ITEM (etfci)->canvas));
    }

    etfci->height = height;

    if (old_height != etfci->height)
        e_canvas_item_request_parent_reflow (item);

    gnome_canvas_item_request_update (item);
}

static void
etfci_update (GnomeCanvasItem *item,
              const cairo_matrix_t *i2c,
              gint flags)
{
    ETableFieldChooserItem *etfci = E_TABLE_FIELD_CHOOSER_ITEM (item);
    gdouble x1, y1, x2, y2;

    if (GNOME_CANVAS_ITEM_CLASS (etfci_parent_class)->update)
        GNOME_CANVAS_ITEM_CLASS (etfci_parent_class)->update (
            item, i2c, flags);

    x1 = y1 = 0;
    x2 = etfci->width;
    y2 = etfci->height;

    gnome_canvas_matrix_transform_rect (i2c, &x1, &y1, &x2, &y2);

    if (item->x1 != x1 ||
        item->y1 != y1 ||
        item->x2 != x2 ||
        item->y2 != y2)
        {
            gnome_canvas_request_redraw (
                item->canvas, item->x1,
                item->y1, item->x2, item->y2);
            item->x1 = x1;
            item->y1 = y1;
            item->x2 = x2;
            item->y2 = y2;
/* FIXME: Group Child bounds !? */
#if 0
            gnome_canvas_group_child_bounds (
                GNOME_CANVAS_GROUP (item->parent), item);
#endif
        }
    gnome_canvas_request_redraw (
        item->canvas, item->x1, item->y1, item->x2, item->y2);
}

static void
etfci_font_load (ETableFieldChooserItem *etfci)
{
    GtkWidget *widget;
    GtkStyle *style;

    if (etfci->font_desc)
        pango_font_description_free (etfci->font_desc);

    widget = GTK_WIDGET (GNOME_CANVAS_ITEM (etfci)->canvas);
    style = gtk_widget_get_style (widget);
    etfci->font_desc = pango_font_description_copy (style->font_desc);
}

static void
etfci_drop_full_header (ETableFieldChooserItem *etfci)
{
    GObject *header;

    if (!etfci->full_header)
        return;

    header = G_OBJECT (etfci->full_header);
    if (etfci->full_header_structure_change_id)
        g_signal_handler_disconnect (
            header, etfci->full_header_structure_change_id);
    if (etfci->full_header_dimension_change_id)
        g_signal_handler_disconnect (
            header, etfci->full_header_dimension_change_id);
    etfci->full_header_structure_change_id = 0;
    etfci->full_header_dimension_change_id = 0;

    if (header)
        g_object_unref (header);
    etfci->full_header = NULL;
    etfci->height = 0;
    e_canvas_item_request_reflow (GNOME_CANVAS_ITEM (etfci));
}

static void
full_header_structure_changed (ETableHeader *header,
                               ETableFieldChooserItem *etfci)
{
    e_canvas_item_request_reflow (GNOME_CANVAS_ITEM (etfci));
}

static void
full_header_dimension_changed (ETableHeader *header,
                               gint col,
                               ETableFieldChooserItem *etfci)
{
    e_canvas_item_request_reflow (GNOME_CANVAS_ITEM (etfci));
}

static void
etfci_add_full_header (ETableFieldChooserItem *etfci,
                       ETableHeader *header)
{
    etfci->full_header = header;
    g_object_ref (etfci->full_header);

    etfci->full_header_structure_change_id = g_signal_connect (
        header, "structure_change",
        G_CALLBACK (full_header_structure_changed), etfci);
    etfci->full_header_dimension_change_id = g_signal_connect (
        header, "dimension_change",
        G_CALLBACK (full_header_dimension_changed), etfci);
    e_canvas_item_request_reflow (GNOME_CANVAS_ITEM (etfci));
}

static void
etfci_drop_table_header (ETableFieldChooserItem *etfci)
{
    GObject *header;

    if (!etfci->header)
        return;

    header = G_OBJECT (etfci->header);
    if (etfci->table_header_structure_change_id)
        g_signal_handler_disconnect (header, etfci->table_header_structure_change_id);
    if (etfci->table_header_dimension_change_id)
        g_signal_handler_disconnect (header, etfci->table_header_dimension_change_id);
    etfci->table_header_structure_change_id = 0;
    etfci->table_header_dimension_change_id = 0;

    if (header)
        g_object_unref (header);
    etfci->header = NULL;
    etfci->height = 0;
    e_canvas_item_request_reflow (GNOME_CANVAS_ITEM (etfci));
}

static void
table_header_structure_changed (ETableHeader *header,
                                ETableFieldChooserItem *etfci)
{
    e_canvas_item_request_reflow (GNOME_CANVAS_ITEM (etfci));
}

static void
table_header_dimension_changed (ETableHeader *header,
                                gint col,
                                ETableFieldChooserItem *etfci)
{
    e_canvas_item_request_reflow (GNOME_CANVAS_ITEM (etfci));
}

static void
etfci_add_table_header (ETableFieldChooserItem *etfci,
                        ETableHeader *header)
{
    etfci->header = header;
    g_object_ref (etfci->header);

    etfci->table_header_structure_change_id = g_signal_connect (
        header, "structure_change",
        G_CALLBACK (table_header_structure_changed), etfci);
    etfci->table_header_dimension_change_id = g_signal_connect (
        header, "dimension_change",
        G_CALLBACK (table_header_dimension_changed), etfci);
    e_canvas_item_request_reflow (GNOME_CANVAS_ITEM (etfci));
}

static void
etfci_set_property (GObject *object,
                    guint prop_id,
                    const GValue *value,
                    GParamSpec *pspec)
{
    GnomeCanvasItem *item;
    ETableFieldChooserItem *etfci;

    item = GNOME_CANVAS_ITEM (object);
    etfci = E_TABLE_FIELD_CHOOSER_ITEM (object);

    switch (prop_id) {
    case PROP_FULL_HEADER:
        etfci_drop_full_header (etfci);
        if (g_value_get_object (value))
            etfci_add_full_header (etfci, E_TABLE_HEADER (g_value_get_object (value)));
        break;

    case PROP_HEADER:
        etfci_drop_table_header (etfci);
        if (g_value_get_object (value))
            etfci_add_table_header (etfci, E_TABLE_HEADER (g_value_get_object (value)));
        break;

    case PROP_DND_CODE:
        g_free (etfci->dnd_code);
        etfci->dnd_code = g_strdup (g_value_get_string (value));
        break;

    case PROP_WIDTH:
        etfci->width = g_value_get_double (value);
        gnome_canvas_item_request_update (item);
        break;
    }
}

static void
etfci_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
    ETableFieldChooserItem *etfci;

    etfci = E_TABLE_FIELD_CHOOSER_ITEM (object);

    switch (prop_id) {

    case PROP_DND_CODE:
        g_value_set_string (value, etfci->dnd_code);
        break;
    case PROP_WIDTH:
        g_value_set_double (value, etfci->width);
        break;
    case PROP_HEIGHT:
        g_value_set_double (value, etfci->height);
        break;
    default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
        break;
    }
}

static void
etfci_drag_data_get (GtkWidget          *widget,
             GdkDragContext     *context,
             GtkSelectionData   *selection_data,
             guint               info,
             guint               time,
             ETableFieldChooserItem *etfci)
{
    if (etfci->drag_col != -1) {
        gchar *string = g_strdup_printf("%d", etfci->drag_col);
        gtk_selection_data_set (selection_data,
                       GDK_SELECTION_TYPE_STRING,
                       sizeof (string[0]),
                       (guchar *)string,
                       strlen (string));
        g_free (string);
    }
}

static void
etfci_drag_end (GtkWidget      *canvas,
        GdkDragContext *context,
        ETableFieldChooserItem *etfci)
{
    etfci->drag_col = -1;
}

static void
etfci_realize (GnomeCanvasItem *item)
{
    ETableFieldChooserItem *etfci = E_TABLE_FIELD_CHOOSER_ITEM (item);

    if (GNOME_CANVAS_ITEM_CLASS (etfci_parent_class)-> realize)
        (*GNOME_CANVAS_ITEM_CLASS (etfci_parent_class)->realize)(item);

    if (!etfci->font_desc)
        etfci_font_load (etfci);

    etfci->drag_end_id = g_signal_connect (
        item->canvas, "drag_end",
        G_CALLBACK (etfci_drag_end), etfci);
    etfci->drag_data_get_id = g_signal_connect (
        item->canvas, "drag_data_get",
        G_CALLBACK (etfci_drag_data_get), etfci);
    e_canvas_item_request_reflow (GNOME_CANVAS_ITEM (etfci));
}

static void
etfci_unrealize (GnomeCanvasItem *item)
{
    ETableFieldChooserItem *etfci = E_TABLE_FIELD_CHOOSER_ITEM (item);

    if (etfci->font_desc)
        pango_font_description_free (etfci->font_desc);
    etfci->font_desc = NULL;

    g_signal_handler_disconnect (item->canvas, etfci->drag_end_id);
    etfci->drag_end_id = 0;
    g_signal_handler_disconnect (item->canvas, etfci->drag_data_get_id);
    etfci->drag_data_get_id = 0;

    if (GNOME_CANVAS_ITEM_CLASS (etfci_parent_class)->unrealize)
        (*GNOME_CANVAS_ITEM_CLASS (etfci_parent_class)->unrealize)(item);
}

static void
etfci_draw (GnomeCanvasItem *item,
            cairo_t *cr,
            gint x,
            gint y,
            gint width,
            gint height)
{
    ETableFieldChooserItem *etfci = E_TABLE_FIELD_CHOOSER_ITEM (item);
    GnomeCanvas *canvas = item->canvas;
    gint rows;
    gint y1, y2;
    gint row;
    GtkStyle *style;
    GtkStateType state;

    if (etfci->combined_header == NULL)
        return;

    rows = e_table_header_count (etfci->combined_header);

    style = gtk_widget_get_style (GTK_WIDGET (canvas));
    state = gtk_widget_get_state (GTK_WIDGET (canvas));

    y1 = y2 = 0;
    for (row = 0; row < rows; row++, y1 = y2) {
        ETableCol *ecol;

        ecol = e_table_header_get_column (etfci->combined_header, row);

        if (ecol->disabled)
            continue;

        y2 += e_table_header_compute_height (ecol, GTK_WIDGET (canvas));

        if (y1 > (y + height))
            break;

        if (y2 < y)
            continue;

        cairo_save (cr);

        e_table_header_draw_button (cr, ecol,
                        style, state,
                        GTK_WIDGET (canvas),
                        -x, y1 - y,
                        width, height,
                        etfci->width, y2 - y1,
                        E_TABLE_COL_ARROW_NONE);

        cairo_restore (cr);
    }
}

static GnomeCanvasItem *
etfci_point (GnomeCanvasItem *item, gdouble x, gdouble y, gint cx, gint cy)
{
    return item;
}

static gboolean
etfci_maybe_start_drag (ETableFieldChooserItem *etfci, gint x, gint y)
{
    if (!etfci->maybe_drag)
        return FALSE;

    if (MAX (abs (etfci->click_x - x),
         abs (etfci->click_y - y)) <= 3)
        return FALSE;

    return TRUE;
}

static void
etfci_start_drag (ETableFieldChooserItem *etfci, GdkEvent *event, gdouble x, gdouble y)
{
    GtkWidget *widget = GTK_WIDGET (GNOME_CANVAS_ITEM (etfci)->canvas);
    GtkTargetList *list;
    GdkDragContext *context;
    GdkWindow *window;
    GtkStyle *style;
    GtkStateType state;
    ETableCol *ecol;
    cairo_surface_t *cs;
    cairo_t *cr;
    gint drag_col;
    gint button_height;
    GdkPixbuf *pixbuf;

    GtkTargetEntry  etfci_drag_types[] = {
        { (gchar *) TARGET_ETABLE_COL_TYPE, 0, TARGET_ETABLE_COL_HEADER },
    };

    if (etfci->combined_header == NULL)
        return;

    drag_col = etfci_find_button (etfci, y);

    if (drag_col < 0 || drag_col > e_table_header_count (etfci->combined_header))
        return;

    ecol = e_table_header_get_column (etfci->combined_header, drag_col);

    if (ecol->disabled)
        return;

    etfci->drag_col = ecol->col_idx;

    etfci_drag_types[0].target = g_strdup_printf (
        "%s-%s", etfci_drag_types[0].target, etfci->dnd_code);
    d(g_print ("etfci - %s\n", etfci_drag_types[0].target));
    list = gtk_target_list_new (etfci_drag_types, G_N_ELEMENTS (etfci_drag_types));
    context = gtk_drag_begin (widget, list, GDK_ACTION_MOVE, 1, event);
    g_free ((gpointer) etfci_drag_types[0].target);

    button_height = e_table_header_compute_height (ecol, widget);
    window = gtk_widget_get_window (widget);
    cs = gdk_window_create_similar_surface (
        window, CAIRO_CONTENT_COLOR, etfci->width, button_height);

    style = gtk_widget_get_style (widget);
    state = gtk_widget_get_state (widget);

    cr = cairo_create (cs);
    e_table_header_draw_button (
        cr, ecol, style,
        state, widget, 0, 0,
        etfci->width, button_height,
        etfci->width, button_height,
        E_TABLE_COL_ARROW_NONE);

    pixbuf = gdk_pixbuf_get_from_window (window, 0, 0, etfci->width, button_height);
    gtk_drag_set_icon_pixbuf (
        context,
        pixbuf,
        etfci->width / 2,
        button_height / 2);
    g_object_unref (pixbuf);

    cairo_surface_destroy (cs);
    cairo_destroy (cr);
    etfci->maybe_drag = FALSE;
}

/*
 * Handles the events on the ETableFieldChooserItem
 */
static gint
etfci_event (GnomeCanvasItem *item, GdkEvent *e)
{
    ETableFieldChooserItem *etfci = E_TABLE_FIELD_CHOOSER_ITEM (item);
    GnomeCanvas *canvas = item->canvas;
    gint x, y;

    switch (e->type) {
    case GDK_MOTION_NOTIFY:
        gnome_canvas_w2c (canvas, e->motion.x, e->motion.y, &x, &y);

        if (etfci_maybe_start_drag (etfci, x, y))
            etfci_start_drag (etfci, e, x, y);
        break;

    case GDK_BUTTON_PRESS:
        gnome_canvas_w2c (canvas, e->button.x, e->button.y, &x, &y);

        if (e->button.button == 1) {
            etfci->click_x = x;
            etfci->click_y = y;
            etfci->maybe_drag = TRUE;
        }
        break;

    case GDK_BUTTON_RELEASE: {
        etfci->maybe_drag = FALSE;
        break;
    }

    default:
        return FALSE;
    }
    return TRUE;
}

static void
etfci_class_init (ETableFieldChooserItemClass *class)
{
    GnomeCanvasItemClass *item_class = GNOME_CANVAS_ITEM_CLASS (class);
    GObjectClass *object_class = G_OBJECT_CLASS (class);

    object_class->dispose = etfci_dispose;
    object_class->set_property = etfci_set_property;
    object_class->get_property = etfci_get_property;

    item_class->update      = etfci_update;
    item_class->realize     = etfci_realize;
    item_class->unrealize   = etfci_unrealize;
    item_class->draw        = etfci_draw;
    item_class->point       = etfci_point;
    item_class->event       = etfci_event;

    g_object_class_install_property (object_class, PROP_DND_CODE,
                     g_param_spec_string ("dnd_code",
                                  "DnD code",
                                  NULL,
                                  NULL,
                                  G_PARAM_READWRITE));

    g_object_class_install_property (object_class, PROP_FULL_HEADER,
                     g_param_spec_object ("full_header",
                                  "Full Header",
                                  NULL,
                                  E_TYPE_TABLE_HEADER,
                                  G_PARAM_READWRITE));

    g_object_class_install_property (object_class, PROP_HEADER,
                     g_param_spec_object ("header",
                                  "Header",
                                  NULL,
                                  E_TYPE_TABLE_HEADER,
                                  G_PARAM_READWRITE));

    g_object_class_install_property (object_class, PROP_WIDTH,
                     g_param_spec_double ("width",
                                  "Width",
                                  NULL,
                                  0, G_MAXDOUBLE, 0,
                                  G_PARAM_READWRITE));

    g_object_class_install_property (object_class, PROP_HEIGHT,
                     g_param_spec_double ("height",
                                  "Height",
                                  NULL,
                                  0, G_MAXDOUBLE, 0,
                                  G_PARAM_READABLE));
}

static void
etfci_init (ETableFieldChooserItem *etfci)
{
    etfci->full_header = NULL;
    etfci->header = NULL;
    etfci->combined_header = NULL;

    etfci->height = etfci->width = 0;

    etfci->font_desc = NULL;

    etfci->full_header_structure_change_id = 0;
    etfci->full_header_dimension_change_id = 0;
    etfci->table_header_structure_change_id = 0;
    etfci->table_header_dimension_change_id = 0;

    etfci->dnd_code = NULL;

    etfci->maybe_drag = 0;
    etfci->drag_end_id = 0;

    e_canvas_item_set_reflow_callback (GNOME_CANVAS_ITEM (etfci), etfci_reflow);
}