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path: root/widgets/table/e-table-field-chooser-item.c
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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * e-table-field-chooser-item.c
 * Copyright 2000, 2001, Ximian, Inc.
 *
 * Authors:
 *   Chris Lahey <clahey@ximian.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License, version 2, as published by the Free Software Foundation.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 */

#include <config.h>

#include <string.h>

#include <gtk/gtk.h>
#include <libgnomecanvas/gnome-canvas.h>
#include <libgnomecanvas/gnome-canvas-util.h>
#include <libgnomecanvas/gnome-canvas-polygon.h>
#include <libgnomecanvas/gnome-canvas-rect-ellipse.h>
#include <gdk-pixbuf/gdk-pixbuf.h>

#include "e-util/e-i18n.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

#define PARENT_OBJECT_TYPE gnome_canvas_item_get_type ()

#define ELEMENTS(x) (sizeof (x) / sizeof (x[0]))

static GnomeCanvasItemClass *etfci_parent_class;

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)
        gdk_font_unref(etfci->font);
    etfci->font = NULL;

    if (G_OBJECT_CLASS (etfci_parent_class)->dispose)
        (*G_OBJECT_CLASS (etfci_parent_class)->dispose) (object);
}

static gint
etfci_find_button (ETableFieldChooserItem *etfci, double loc)
{
    int i;
    int count;
    double 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)
{
    int count;
    GHashTable *hash;
    int 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);
    double old_height;
    int i;
    int count;
    double 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, double *affine, ArtSVP *clip_path, int flags)
{
    ETableFieldChooserItem *etfci = E_TABLE_FIELD_CHOOSER_ITEM (item);
    double   i2c [6];
    ArtPoint c1, c2, i1, i2;
    
    if (GNOME_CANVAS_ITEM_CLASS (etfci_parent_class)->update)
        (*GNOME_CANVAS_ITEM_CLASS (etfci_parent_class)->update)(item, affine, clip_path, flags);

    i1.x = i1.y = 0;
    i2.x = etfci->width;
    i2.y = etfci->height;

    gnome_canvas_item_i2c_affine (item, i2c);
    art_affine_point (&c1, &i1, i2c);
    art_affine_point (&c2, &i2, i2c);

    if (item->x1 != c1.x ||
         item->y1 != c1.y ||
         item->x2 != c2.x ||
         item->y2 != c2.y)
        {
            gnome_canvas_request_redraw (item->canvas, item->x1, item->y1, item->x2, item->y2);
            item->x1 = c1.x;
            item->y1 = c1.y;
            item->x2 = c2.x;
            item->y2 = c2.y;
#ifndef NO_WARNINGS
#warning Group Child bounds !?
#endif
#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)
{
    if (etfci->font)
        gdk_font_unref (etfci->font);

    etfci->font = gtk_style_get_font (GTK_WIDGET(GNOME_CANVAS_ITEM(etfci)->canvas)->style);
    gdk_font_ref(etfci->font);
}

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, int 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, int 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, g_strdup (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]),
                       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)
        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)
        gdk_font_unref (etfci->font);
    etfci->font = 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, GdkDrawable *drawable, int x, int y, int width, int height)
{
    ETableFieldChooserItem *etfci = E_TABLE_FIELD_CHOOSER_ITEM (item);
    GnomeCanvas *canvas = item->canvas;
    int rows;
    int y1, y2;
    int row;
    GtkStyle *style;
    GtkStateType state;

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

    rows = e_table_header_count (etfci->combined_header);

    style = GTK_WIDGET (canvas)->style;
    state = GTK_WIDGET_STATE (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;

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

static double
etfci_point (GnomeCanvasItem *item, double x, double y, int cx, int cy,
        GnomeCanvasItem **actual_item)
{
    *actual_item = item;
    return 0.0;
}

static gboolean
etfci_maybe_start_drag (ETableFieldChooserItem *etfci, int x, int 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, double x, double y)
{
    GtkWidget *widget = GTK_WIDGET (GNOME_CANVAS_ITEM (etfci)->canvas);
    GtkTargetList *list;
    GdkDragContext *context;
    ETableCol *ecol;
    GdkPixmap *pixmap;
    int drag_col;
    int button_height;

    GtkTargetEntry  etfci_drag_types [] = {
        { 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, ELEMENTS (etfci_drag_types));
    context = gtk_drag_begin (widget, list, GDK_ACTION_MOVE, 1, event);
    g_free(etfci_drag_types[0].target);

    button_height = e_table_header_compute_height (ecol, widget);
    pixmap = gdk_pixmap_new (widget->window, etfci->width, button_height, -1);

    e_table_header_draw_button (pixmap, ecol,
                    widget->style, GTK_WIDGET_STATE (widget),
                    widget,
                    0, 0,
                    etfci->width, button_height,
                    etfci->width, button_height,
                    E_TABLE_COL_ARROW_NONE);

    gtk_drag_set_icon_pixmap        (context,
                     gdk_window_get_colormap (widget->window),
                     pixmap,
                     NULL,
                     etfci->width / 2,
                     button_height / 2);
    gdk_pixmap_unref (pixmap);
    etfci->maybe_drag = FALSE;
}

/*
 * Handles the events on the ETableFieldChooserItem
 */
static int
etfci_event (GnomeCanvasItem *item, GdkEvent *e)
{
    ETableFieldChooserItem *etfci = E_TABLE_FIELD_CHOOSER_ITEM (item);
    GnomeCanvas *canvas = item->canvas;
    int 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 (GObjectClass *object_class)
{
    GnomeCanvasItemClass *item_class = (GnomeCanvasItemClass *) object_class;

    etfci_parent_class = g_type_class_ref (PARENT_OBJECT_TYPE);
    
    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"),
                                  /*_( */"XXX blurb" /*)*/,
                                  NULL,
                                  G_PARAM_READWRITE));

    g_object_class_install_property (object_class, PROP_FULL_HEADER,
                     g_param_spec_object ("full_header",
                                  _("Full Header"),
                                  /*_( */"XXX blurb" /*)*/,
                                  E_TABLE_HEADER_TYPE,
                                  G_PARAM_READWRITE));

    g_object_class_install_property (object_class, PROP_HEADER,
                     g_param_spec_object ("header",
                                  _("Header"),
                                  /*_( */"XXX blurb" /*)*/,
                                  E_TABLE_HEADER_TYPE,
                                  G_PARAM_READWRITE));

    g_object_class_install_property (object_class, PROP_WIDTH,
                     g_param_spec_double ("width",
                                  _("Width"),
                                  /*_( */"XXX blurb" /*)*/,
                                  0, G_MAXDOUBLE, 0,
                                  G_PARAM_READWRITE));

    g_object_class_install_property (object_class, PROP_HEIGHT,
                     g_param_spec_double ("height",
                                  _("Height"),
                                  /*_( */"XXX blurb" /*)*/,
                                  0, G_MAXDOUBLE, 0,
                                  G_PARAM_READABLE));
}

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

    etfci->full_header = NULL;
    etfci->header = NULL;
    etfci->combined_header = NULL;
    
    etfci->height = etfci->width = 0;

    etfci->font = 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(item, etfci_reflow);
}

E_MAKE_TYPE (e_table_field_chooser_item,
         "ETableFieldChooserItem",
         ETableFieldChooserItem,
         etfci_class_init,
         etfci_init,
         PARENT_OBJECT_TYPE)