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path: root/widgets/e-table/e-table.c
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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * E-table.c: A graphical view of a Table.
 *
 * Author:
 *   Miguel de Icaza (miguel@helixcode.com)
 *   Chris Lahey (clahey@helixcode.com)
 *
 * Copyright 1999, Helix Code, Inc
 */
#include <config.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#ifdef HAVE_ALLOCA_H
#include <alloca.h>
#endif
#include <stdio.h>
#include <libgnomeui/gnome-canvas.h>
#include <gtk/gtksignal.h>
#include <gnome-xml/parser.h>
#include <gnome-xml/xmlmemory.h>

#include "e-util/e-util.h"
#include "e-util/e-xml-utils.h"
#include "e-util/e-canvas.h"
#include "e-util/e-canvas-vbox.h"
#include "e-table.h"
#include "e-table-header-item.h"
#include "e-table-subset.h"
#include "e-table-item.h"
#include "e-table-group.h"
#include "e-table-group-leaf.h"
#include "e-table-click-to-add.h"

#define COLUMN_HEADER_HEIGHT 16

#define PARENT_TYPE gtk_table_get_type ()

static GtkObjectClass *e_table_parent_class;

enum {
    ROW_SELECTION,
    CURSOR_CHANGE,
    DOUBLE_CLICK,
    RIGHT_CLICK,
    KEY_PRESS,

    TABLE_DRAG_BEGIN,
    TABLE_DRAG_END,
    TABLE_DRAG_DATA_GET,
    TABLE_DRAG_DATA_DELETE,

    TABLE_DRAG_LEAVE,
    TABLE_DRAG_MOTION,
    TABLE_DRAG_DROP,
    TABLE_DRAG_DATA_RECEIVED,

    LAST_SIGNAL
};

enum {
    ARG_0,
    ARG_TABLE_DRAW_GRID,
    ARG_TABLE_DRAW_FOCUS,
    ARG_CURSOR_MODE,
    ARG_LENGTH_THRESHOLD,
    ARG_CLICK_TO_ADD_MESSAGE,
};

static gint et_signals [LAST_SIGNAL] = { 0, };

static void e_table_fill_table (ETable *e_table, ETableModel *model);
static gboolean changed_idle (gpointer data);

static void et_drag_begin (GtkWidget *widget,
               GdkDragContext *context,
               ETable *et);
static void et_drag_end (GtkWidget *widget,
             GdkDragContext *context,
             ETable *et);
static void et_drag_data_get(GtkWidget *widget,
                 GdkDragContext *context,
                 GtkSelectionData *selection_data,
                 guint info,
                 guint time,
                 ETable *et);
static void et_drag_data_delete(GtkWidget *widget,
                GdkDragContext *context,
                ETable *et);

static void et_drag_leave(GtkWidget *widget,
              GdkDragContext *context,
              guint time,
              ETable *et);
static gboolean et_drag_motion(GtkWidget *widget,
                   GdkDragContext *context,
                   gint x,
                   gint y,
                   guint time,
                   ETable *et);
static gboolean et_drag_drop(GtkWidget *widget,
                 GdkDragContext *context,
                 gint x,
                 gint y,
                 guint time,
                 ETable *et);
static void et_drag_data_received(GtkWidget *widget,
                  GdkDragContext *context,
                  gint x,
                  gint y,
                  GtkSelectionData *selection_data,
                  guint info,
                  guint time,
                  ETable *et);

static void
et_destroy (GtkObject *object)
{
    ETable *et = E_TABLE (object);
    

    gtk_signal_disconnect (GTK_OBJECT (et->model),
                   et->table_model_change_id);
    gtk_signal_disconnect (GTK_OBJECT (et->model),
                   et->table_row_change_id);
    gtk_signal_disconnect (GTK_OBJECT (et->model),
                   et->table_cell_change_id);
    gtk_signal_disconnect (GTK_OBJECT (et->model),
                   et->table_row_inserted_id);
    gtk_signal_disconnect (GTK_OBJECT (et->model),
                   et->table_row_deleted_id);
    if (et->group_info_change_id)
        gtk_signal_disconnect (GTK_OBJECT (et->sort_info),
                       et->group_info_change_id);

    if (et->reflow_idle_id)
        g_source_remove(et->reflow_idle_id);
    et->reflow_idle_id = 0;

    gtk_object_unref (GTK_OBJECT (et->model));
    gtk_object_unref (GTK_OBJECT (et->full_header));
    gtk_object_unref (GTK_OBJECT (et->header));
    gtk_object_unref (GTK_OBJECT (et->sort_info));
    gtk_widget_destroy (GTK_WIDGET (et->header_canvas));
    gtk_widget_destroy (GTK_WIDGET (et->table_canvas));

    if (et->rebuild_idle_id) {
        g_source_remove (et->rebuild_idle_id);
        et->rebuild_idle_id = 0;
    }
    
    g_free(et->click_to_add_message);
    
    (*e_table_parent_class->destroy)(object);
}

static void
e_table_init (GtkObject *object)
{
    ETable *e_table = E_TABLE (object);
    GtkTable *gtk_table = GTK_TABLE (object);

    gtk_table->homogeneous = FALSE;
    
    e_table->sort_info = NULL;
    e_table->group_info_change_id = 0;
    e_table->reflow_idle_id = 0;

    e_table->draw_grid = 1;
    e_table->draw_focus = 1;
    e_table->cursor_mode = E_TABLE_CURSOR_SIMPLE;
    e_table->length_threshold = 200;
    
    e_table->need_rebuild = 0;
    e_table->rebuild_idle_id = 0;
    
    e_table->click_to_add_message = NULL;

    e_table->drag_get_data_row = -1;
    e_table->drag_get_data_col = -1;
    e_table->drag_row = -1;
    e_table->drag_col = -1;
    e_table->drop_row = -1;
    e_table->drop_col = -1;
}

static void
header_canvas_size_allocate (GtkWidget *widget, GtkAllocation *alloc, ETable *e_table)
{
    gnome_canvas_set_scroll_region (
        GNOME_CANVAS (e_table->header_canvas),
        0, 0, alloc->width - 1, COLUMN_HEADER_HEIGHT - 1);
}

static void
sort_info_changed (ETableSortInfo *info, ETable *et)
{
    et->need_rebuild = TRUE;
    if (!et->rebuild_idle_id)
        et->rebuild_idle_id = g_idle_add_full (20, changed_idle, et, NULL);
}

static void
e_table_setup_header (ETable *e_table)
{
    e_table->header_canvas = GNOME_CANVAS (e_canvas_new ());
    
    gtk_widget_show (GTK_WIDGET (e_table->header_canvas));

    e_table->header_item = gnome_canvas_item_new (
        gnome_canvas_root (e_table->header_canvas),
        e_table_header_item_get_type (),
        "ETableHeader", e_table->header,
        "full_header", e_table->full_header,
        "sort_info", e_table->sort_info,
        "dnd_code", "(unset)",
        NULL);

    gtk_signal_connect (
        GTK_OBJECT (e_table->header_canvas), "size_allocate",
        GTK_SIGNAL_FUNC (header_canvas_size_allocate), e_table);

    gtk_widget_set_usize (GTK_WIDGET (e_table->header_canvas), -1, COLUMN_HEADER_HEIGHT);
}

static gboolean
table_canvas_reflow_idle (ETable *e_table)
{
    gdouble height, width;
    GtkAllocation *alloc = &(GTK_WIDGET (e_table->table_canvas)->allocation);

    gtk_object_get (GTK_OBJECT (e_table->canvas_vbox),
            "height", &height,
            "width", &width,
            NULL);
    height = MAX ((int)height, alloc->height);
    width = MAX((int)width, alloc->width);
    /* I have no idea why this needs to be -1, but it works. */
    gnome_canvas_set_scroll_region (
        GNOME_CANVAS (e_table->table_canvas),
        0, 0, width - 1, height - 1);
    e_table->reflow_idle_id = 0;
    return FALSE;
}

static void
table_canvas_size_allocate (GtkWidget *widget, GtkAllocation *alloc,
                ETable *e_table)
{
    gdouble width;
    width = alloc->width;

    gtk_object_set (GTK_OBJECT (e_table->canvas_vbox),
            "width", width,
            NULL);
    gtk_object_set (GTK_OBJECT (e_table->header),
            "width", width,
            NULL);
    if (e_table->reflow_idle_id)
        g_source_remove(e_table->reflow_idle_id);
    table_canvas_reflow_idle(e_table);
}

static void
table_canvas_reflow (GnomeCanvas *canvas, ETable *e_table)
{
    if (!e_table->reflow_idle_id)
        e_table->reflow_idle_id = g_idle_add_full (400, (GSourceFunc) table_canvas_reflow_idle, e_table, NULL);
}

static void
group_row_selection (ETableGroup *etg, int row, gboolean selected, ETable *et)
{
    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [ROW_SELECTION],
             row, selected);
    if (et->row_selection_active && selected) {
        e_table_click_to_add_commit (E_TABLE_CLICK_TO_ADD(et->click_to_add));
        et->row_selection_active = FALSE;
    }
}

static void
group_cursor_change (ETableGroup *etg, int row, ETable *et)
{
    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [CURSOR_CHANGE],
             row);
}

static void
group_double_click (ETableGroup *etg, int row, ETable *et)
{
    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [DOUBLE_CLICK],
             row);
}

static gint
group_right_click (ETableGroup *etg, int row, int col, GdkEvent *event, ETable *et)
{
    int return_val;
    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [RIGHT_CLICK],
             row, col, event, &return_val);
    return return_val;
}

static gint
group_key_press (ETableGroup *etg, int row, int col, GdkEvent *event, ETable *et)
{
    int return_val;
    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [KEY_PRESS],
             row, col, event, &return_val);
    return return_val;
}

static gboolean
changed_idle (gpointer data)
{
    ETable *et = E_TABLE (data);

    if (et->need_rebuild) {
        gtk_object_destroy (GTK_OBJECT (et->group));
        et->group = e_table_group_new (GNOME_CANVAS_GROUP (et->canvas_vbox),
                           et->full_header,
                           et->header,
                           et->model,
                           et->sort_info,
                           0);
        e_canvas_vbox_add_item(E_CANVAS_VBOX(et->canvas_vbox), GNOME_CANVAS_ITEM(et->group));
        gnome_canvas_item_set(GNOME_CANVAS_ITEM(et->group),
                      "drawgrid", et->draw_grid,
                      "drawfocus", et->draw_focus,
                      "cursor_mode", et->cursor_mode,
                      "length_threshold", et->length_threshold,
                      NULL);
        gtk_signal_connect (GTK_OBJECT (et->group), "row_selection",
                    GTK_SIGNAL_FUNC (group_row_selection), et);
        gtk_signal_connect (GTK_OBJECT (et->group), "cursor_change",
                    GTK_SIGNAL_FUNC (group_cursor_change), et);
        gtk_signal_connect (GTK_OBJECT (et->group), "double_click",
                    GTK_SIGNAL_FUNC (group_double_click), et);
        gtk_signal_connect (GTK_OBJECT (et->group), "right_click",
                    GTK_SIGNAL_FUNC (group_right_click), et);
        gtk_signal_connect (GTK_OBJECT (et->group), "key_press",
                    GTK_SIGNAL_FUNC (group_key_press), et);
        e_table_fill_table (et, et->model);
        
        gtk_object_set (GTK_OBJECT (et->canvas_vbox),
                "width", (double) GTK_WIDGET (et->table_canvas)->allocation.width,
                NULL);
    }

    et->need_rebuild = 0;
    et->rebuild_idle_id = 0;

    return FALSE;
}

static void
et_table_model_changed (ETableModel *model, ETable *et)
{
    et->need_rebuild = TRUE;
    if (!et->rebuild_idle_id)
        et->rebuild_idle_id = g_idle_add_full (20, changed_idle, et, NULL);
}

static void
et_table_row_changed (ETableModel *table_model, int row, ETable *et)
{
    if (!et->need_rebuild) {
        if (e_table_group_remove (et->group, row))
            e_table_group_add (et->group, row);
    }
}

static void
et_table_cell_changed (ETableModel *table_model, int view_col, int row, ETable *et)
{
    et_table_row_changed (table_model, row, et);
}

static void
et_table_row_inserted (ETableModel *table_model, int row, ETable *et)
{
    if (!et->need_rebuild) {
        e_table_group_add (et->group, row);
    }
}

static void
et_table_row_deleted (ETableModel *table_model, int row, ETable *et)
{
    if (!et->need_rebuild) {
        e_table_group_remove (et->group, row);
    }
}

static void
click_to_add_row_selection (ETableClickToAdd *etcta, int row, gboolean selected, ETable *et)
{
    if ((!et->row_selection_active) && selected) {
        et->row_selection_active = TRUE;
    }
}

static void
e_table_setup_table (ETable *e_table, ETableHeader *full_header, ETableHeader *header,
             ETableModel *model)
{
    e_table->table_canvas = GNOME_CANVAS (e_canvas_new ());
    gtk_signal_connect (
        GTK_OBJECT (e_table->table_canvas), "size_allocate",
        GTK_SIGNAL_FUNC (table_canvas_size_allocate), e_table);

    gtk_signal_connect (
        GTK_OBJECT (e_table->table_canvas), "drag_begin",
        GTK_SIGNAL_FUNC (et_drag_begin), e_table);
    gtk_signal_connect (
        GTK_OBJECT (e_table->table_canvas), "drag_end",
        GTK_SIGNAL_FUNC (et_drag_end), e_table);
    gtk_signal_connect (
        GTK_OBJECT (e_table->table_canvas), "drag_data_get",
        GTK_SIGNAL_FUNC (et_drag_data_get), e_table);
    gtk_signal_connect (
        GTK_OBJECT (e_table->table_canvas), "drag_data_delete",
        GTK_SIGNAL_FUNC (et_drag_data_delete), e_table);
    gtk_signal_connect (
        GTK_OBJECT (e_table->table_canvas), "drag_motion",
        GTK_SIGNAL_FUNC (et_drag_motion), e_table);
    gtk_signal_connect (
        GTK_OBJECT (e_table->table_canvas), "drag_leave",
        GTK_SIGNAL_FUNC (et_drag_leave), e_table);
    gtk_signal_connect (
        GTK_OBJECT (e_table->table_canvas), "drag_drop",
        GTK_SIGNAL_FUNC (et_drag_drop), e_table);
    gtk_signal_connect (
        GTK_OBJECT (e_table->table_canvas), "drag_data_received",
        GTK_SIGNAL_FUNC (et_drag_data_received), e_table);
    
    gtk_signal_connect (GTK_OBJECT(e_table->table_canvas), "reflow",
                GTK_SIGNAL_FUNC (table_canvas_reflow), e_table);
                 
    gtk_widget_show (GTK_WIDGET (e_table->table_canvas));


    e_table->canvas_vbox = gnome_canvas_item_new(gnome_canvas_root(e_table->table_canvas),
                             e_canvas_vbox_get_type(),
                             "spacing", 10.0,
                             NULL);

    if (e_table->use_click_to_add) {
        e_table->click_to_add = gnome_canvas_item_new (GNOME_CANVAS_GROUP(e_table->canvas_vbox),
                                   e_table_click_to_add_get_type (),
                                   "header", e_table->header,
                                   "model", e_table->model,
                                   "message", e_table->click_to_add_message,
                                   NULL);
        
        gtk_signal_connect(GTK_OBJECT(e_table->click_to_add), "row_selection",
                   GTK_SIGNAL_FUNC(click_to_add_row_selection), e_table);                  
        
        e_canvas_vbox_add_item(E_CANVAS_VBOX(e_table->canvas_vbox), e_table->click_to_add);
    }

    e_table->group = e_table_group_new (
        GNOME_CANVAS_GROUP (e_table->canvas_vbox),
        full_header, header,
        model, e_table->sort_info, 0);
    e_canvas_vbox_add_item(E_CANVAS_VBOX(e_table->canvas_vbox), GNOME_CANVAS_ITEM(e_table->group));

    gnome_canvas_item_set(GNOME_CANVAS_ITEM(e_table->group),
                  "drawgrid", e_table->draw_grid,
                  "drawfocus", e_table->draw_focus,
                  "cursor_mode", e_table->cursor_mode,
                  "length_threshold", e_table->length_threshold,
                  NULL);

    gtk_signal_connect (GTK_OBJECT (e_table->group), "row_selection",
                GTK_SIGNAL_FUNC(group_row_selection), e_table);
    gtk_signal_connect (GTK_OBJECT (e_table->group), "cursor_change",
                GTK_SIGNAL_FUNC(group_cursor_change), e_table);
    gtk_signal_connect (GTK_OBJECT (e_table->group), "double_click",
                GTK_SIGNAL_FUNC(group_double_click), e_table);
    gtk_signal_connect (GTK_OBJECT (e_table->group), "right_click",
                GTK_SIGNAL_FUNC(group_right_click), e_table);
    gtk_signal_connect (GTK_OBJECT (e_table->group), "key_press",
                GTK_SIGNAL_FUNC(group_key_press), e_table);
    
    e_table->table_model_change_id = gtk_signal_connect (
        GTK_OBJECT (model), "model_changed",
        GTK_SIGNAL_FUNC (et_table_model_changed), e_table);

    e_table->table_row_change_id = gtk_signal_connect (
        GTK_OBJECT (model), "model_row_changed",
        GTK_SIGNAL_FUNC (et_table_row_changed), e_table);

    e_table->table_cell_change_id = gtk_signal_connect (
        GTK_OBJECT (model), "model_cell_changed",
        GTK_SIGNAL_FUNC (et_table_cell_changed), e_table);
    
    e_table->table_row_inserted_id = gtk_signal_connect (
        GTK_OBJECT (model), "model_row_inserted",
        GTK_SIGNAL_FUNC (et_table_row_inserted), e_table);
    
    e_table->table_row_deleted_id = gtk_signal_connect (
        GTK_OBJECT (model), "model_row_deleted",
        GTK_SIGNAL_FUNC (et_table_row_deleted), e_table);

}

static void
e_table_fill_table (ETable *e_table, ETableModel *model)
{
    e_table_group_add_all (e_table->group);
}

static ETableHeader *
et_xml_to_header (ETable *e_table, ETableHeader *full_header, xmlNode *xmlColumns)
{
    ETableHeader *nh;
    xmlNode *column;
    const int max_cols = e_table_header_count (full_header);

    g_return_val_if_fail (e_table, NULL);
    g_return_val_if_fail (full_header, NULL);
    g_return_val_if_fail (xmlColumns, NULL);
    
    nh = e_table_header_new ();

    for (column = xmlColumns->childs; column; column = column->next) {
        gchar *content;
        int col;

        content = xmlNodeListGetString (column->doc, column->childs, 1);
        col = atoi (content);
        xmlFree (content);

        if (col >= max_cols)
            continue;

        e_table_header_add_column (nh, e_table_header_get_column (full_header, col), -1);
    }

    return nh;
}

static void
et_grouping_xml_to_sort_info (ETable *table, xmlNode *grouping)
{
    int i;

    g_return_if_fail (table!=NULL);
    g_return_if_fail (grouping!=NULL);  
    
    table->sort_info = e_table_sort_info_new ();
    
    gtk_object_ref (GTK_OBJECT (table->sort_info));
    gtk_object_sink (GTK_OBJECT (table->sort_info));

    i = 0;
    for (grouping = grouping->childs; grouping && !strcmp (grouping->name, "group"); grouping = grouping->childs) {
        ETableSortColumn column;
        column.column = e_xml_get_integer_prop_by_name (grouping, "column");
        column.ascending = e_xml_get_integer_prop_by_name (grouping, "ascending");
        e_table_sort_info_grouping_set_nth(table->sort_info, i++, column);
    }
    i = 0;
    for (; grouping && !strcmp (grouping->name, "leaf"); grouping = grouping->childs) {
        ETableSortColumn column;
        column.column = e_xml_get_integer_prop_by_name (grouping, "column");
        column.ascending = e_xml_get_integer_prop_by_name (grouping, "ascending");
        e_table_sort_info_sorting_set_nth(table->sort_info, i++, column);
    }

    table->group_info_change_id = 
        gtk_signal_connect (GTK_OBJECT (table->sort_info), "group_info_changed", 
                    GTK_SIGNAL_FUNC (sort_info_changed), table);
}

static ETable *
et_real_construct (ETable *e_table, ETableHeader *full_header, ETableModel *etm,
           xmlDoc *xmlSpec)
{
    xmlNode *xmlRoot;
    xmlNode *xmlColumns;
    xmlNode *xmlGrouping;
    gboolean no_header;
    int row = 0;

    xmlRoot = xmlDocGetRootElement (xmlSpec);
    xmlColumns = e_xml_get_child_by_name (xmlRoot, "columns-shown");
    xmlGrouping = e_xml_get_child_by_name (xmlRoot, "grouping");

    if ((xmlColumns == NULL) || (xmlGrouping == NULL))
        return NULL;

    no_header = e_xml_get_integer_prop_by_name(xmlRoot, "no-header");
    e_table->use_click_to_add = e_xml_get_integer_prop_by_name(xmlRoot, "click-to-add");

    
    e_table->full_header = full_header;
    gtk_object_ref (GTK_OBJECT (full_header));

    e_table->model = etm;
    gtk_object_ref (GTK_OBJECT (etm));

    gtk_widget_push_visual (gdk_rgb_get_visual ());
    gtk_widget_push_colormap (gdk_rgb_get_cmap ());

    e_table->header = et_xml_to_header (e_table, full_header, xmlColumns);
    et_grouping_xml_to_sort_info (e_table, xmlGrouping);
    
    gtk_object_set(GTK_OBJECT(e_table->header),
               "sort_info", e_table->sort_info,
               NULL);

    if (!no_header) {
        e_table_setup_header (e_table);
    }
    e_table_setup_table (e_table, full_header, e_table->header, etm);
    e_table_fill_table (e_table, etm);

    gtk_layout_get_vadjustment (GTK_LAYOUT (e_table->table_canvas))->step_increment = 20;
    gtk_adjustment_changed(gtk_layout_get_vadjustment (GTK_LAYOUT (e_table->table_canvas)));

    if (!no_header) {
        /*
         * The header
         */
        gtk_table_attach (GTK_TABLE (e_table), GTK_WIDGET (e_table->header_canvas),
                  0, 1, 0 + row, 1 + row,
                  GTK_FILL | GTK_EXPAND,
                  GTK_FILL, 0, 0);
        row ++;
    }
    gtk_table_attach (GTK_TABLE (e_table), GTK_WIDGET (e_table->table_canvas),
              0, 1, 0 + row, 1 + row,
              GTK_FILL | GTK_EXPAND,
              GTK_FILL | GTK_EXPAND,
              0, 0);
    
    gtk_widget_pop_colormap ();
    gtk_widget_pop_visual ();

    return e_table;
}

ETable *
e_table_construct (ETable *e_table, ETableHeader *full_header,
           ETableModel *etm, const char *spec)
{
    xmlDoc *xmlSpec;
    char *copy;
    copy = g_strdup (spec);

    xmlSpec = xmlParseMemory (copy, strlen(copy));
    e_table = et_real_construct (e_table, full_header, etm, xmlSpec);
    xmlFreeDoc (xmlSpec);
    g_free (copy);

    return e_table;
}

ETable *
e_table_construct_from_spec_file (ETable *e_table, ETableHeader *full_header, ETableModel *etm,
                  const char *filename)
{
    xmlDoc *xmlSpec;

    xmlSpec = xmlParseFile (filename);
    e_table = et_real_construct (e_table, full_header, etm, xmlSpec);
    xmlFreeDoc (xmlSpec);

    return e_table;
}

GtkWidget *
e_table_new (ETableHeader *full_header, ETableModel *etm, const char *spec)
{
    ETable *e_table;

    e_table = gtk_type_new (e_table_get_type ());

    e_table = e_table_construct (e_table, full_header, etm, spec);
        
    return GTK_WIDGET (e_table);
}

GtkWidget *
e_table_new_from_spec_file (ETableHeader *full_header, ETableModel *etm, const char *filename)
{
    ETable *e_table;

    e_table = gtk_type_new (e_table_get_type ());

    e_table = e_table_construct_from_spec_file (e_table, full_header, etm, filename);
        
    return (GtkWidget *) e_table;
}

static xmlNode *
et_build_column_spec (ETable *e_table)
{
    xmlNode *columns_shown;
    gint i;
    gint col_count;

    columns_shown = xmlNewNode (NULL, "columns-shown");

    col_count = e_table_header_count (e_table->header);
    for (i = 0; i < col_count; i++){
        gchar *text = g_strdup_printf ("%d", e_table_header_index(e_table->header, i));
        xmlNewChild (columns_shown, NULL, "column", text);
        g_free (text);
    }

    return columns_shown;
}

static xmlNode *
et_build_grouping_spec (ETable *e_table)
{
    xmlNode *node;
    xmlNode *grouping;
    int i;
    const int sort_count = e_table_sort_info_sorting_get_count (e_table->sort_info);
    const int group_count = e_table_sort_info_grouping_get_count (e_table->sort_info);
    
    grouping = xmlNewNode (NULL, "grouping");
    node = grouping;

    for (i = 0; i < group_count; i++) {
        ETableSortColumn column = e_table_sort_info_grouping_get_nth(e_table->sort_info, i);
        xmlNode *new_node = xmlNewChild(node, NULL, "group", NULL);

        e_xml_set_integer_prop_by_name (new_node, "column", column.column);
        e_xml_set_integer_prop_by_name (new_node, "ascending", column.ascending);
        node = new_node;
    }

    for (i = 0; i < sort_count; i++) {
        ETableSortColumn column = e_table_sort_info_sorting_get_nth(e_table->sort_info, i);
        xmlNode *new_node = xmlNewChild(node, NULL, "leaf", NULL);
        
        e_xml_set_integer_prop_by_name (new_node, "column", column.column);
        e_xml_set_integer_prop_by_name (new_node, "ascending", column.ascending);
        node = new_node;
    }

    return grouping;
}

static xmlDoc *
et_build_tree (ETable *e_table)
{
    xmlDoc *doc;
    xmlNode *root;

    doc = xmlNewDoc ("1.0");
    if (doc == NULL)
        return NULL;
    
    root = xmlNewDocNode (doc, NULL, "ETableSpecification", NULL);
    xmlDocSetRootElement (doc, root);
    xmlAddChild (root, et_build_column_spec (e_table));
    xmlAddChild (root, et_build_grouping_spec (e_table));

    return doc;
}

gchar *
e_table_get_specification (ETable *e_table)
{
    xmlDoc *doc;
    xmlChar *buffer;
    gint size;

    doc = et_build_tree (e_table);
    xmlDocDumpMemory (doc, &buffer, &size);
    xmlFreeDoc (doc);

    return buffer;
}

void
e_table_save_specification (ETable *e_table, gchar *filename)
{
    xmlDoc *doc = et_build_tree (e_table);

    xmlSaveFile (filename, doc);
    xmlFreeDoc (doc);
}

void
e_table_set_cursor_row (ETable *e_table, int row)
{
    e_table_group_set_cursor_row(e_table->group, row);
}

int
e_table_get_cursor_row (ETable *e_table)
{
    return e_table_group_get_cursor_row(e_table->group);
}

void
e_table_selected_row_foreach     (ETable *e_table,
                  ETableForeachFunc callback,
                  gpointer closure)
{
    e_table_group_selected_row_foreach(e_table->group,
                       callback,
                       closure);
}


EPrintable *
e_table_get_printable (ETable *e_table)
{
    return e_table_group_get_printable(e_table->group);
}

static void
et_get_arg (GtkObject *o, GtkArg *arg, guint arg_id)
{
    ETable *etable = E_TABLE (o);

    switch (arg_id){
    case ARG_TABLE_DRAW_GRID:
        GTK_VALUE_BOOL (*arg) = etable->draw_grid;
        break;

    case ARG_TABLE_DRAW_FOCUS:
        GTK_VALUE_BOOL (*arg) = etable->draw_focus;
        break;

    case ARG_CLICK_TO_ADD_MESSAGE:
        GTK_VALUE_STRING (*arg) = g_strdup (etable->click_to_add_message);
        break;
    }
}

typedef struct {
    char     *arg;
    gboolean  setting;
} bool_closure;

static void
et_set_arg (GtkObject *o, GtkArg *arg, guint arg_id)
{
    ETable *etable = E_TABLE (o);
    
    switch (arg_id){
    case ARG_LENGTH_THRESHOLD:
        etable->length_threshold = GTK_VALUE_INT (*arg);
        if (etable->group) {
            gnome_canvas_item_set (GNOME_CANVAS_ITEM(etable->group),
                           "length_threshold", GTK_VALUE_INT (*arg),
                           NULL);
        }
        break;
        
    case ARG_TABLE_DRAW_GRID:
        etable->draw_grid = GTK_VALUE_BOOL (*arg);
        if (etable->group) {
            gnome_canvas_item_set (GNOME_CANVAS_ITEM(etable->group),
                           "drawgrid", GTK_VALUE_BOOL (*arg),
                           NULL);
        }
        break;

    case ARG_TABLE_DRAW_FOCUS:
        etable->draw_focus = GTK_VALUE_BOOL (*arg);
        if (etable->group) {
            gnome_canvas_item_set (GNOME_CANVAS_ITEM(etable->group),
                    "drawfocus", GTK_VALUE_BOOL (*arg),
                    NULL);
        }
        break;

    case ARG_CURSOR_MODE:
        etable->cursor_mode = GTK_VALUE_INT (*arg);
        if (etable->group) {
            gnome_canvas_item_set (GNOME_CANVAS_ITEM(etable->group),
                    "cursor_mode", GTK_VALUE_INT (*arg),
                    NULL);
        }
        break;
    case ARG_CLICK_TO_ADD_MESSAGE:
        if (etable->click_to_add_message)
            g_free(etable->click_to_add_message);
        etable->click_to_add_message = g_strdup(GTK_VALUE_STRING (*arg));
        if (etable->click_to_add)
            gnome_canvas_item_set(etable->click_to_add,
                          "message", etable->click_to_add_message,
                          NULL);
        break;
    }
}
    
static void
set_scroll_adjustments   (ETable *table,
              GtkAdjustment *hadjustment,
              GtkAdjustment *vadjustment)
{
    if (vadjustment != NULL) {
        vadjustment->step_increment = 20;
        gtk_adjustment_changed(vadjustment);
    }

    gtk_layout_set_hadjustment (GTK_LAYOUT(table->table_canvas),
                    hadjustment);
    gtk_layout_set_vadjustment (GTK_LAYOUT(table->table_canvas),
                    vadjustment);
    gtk_layout_set_hadjustment (GTK_LAYOUT(table->header_canvas),
                    hadjustment);
}

/* Drag & drop stuff. */
/* Target */
void e_table_drag_get_data (ETable         *table,
                int             row,
                int             col,
                GdkDragContext *context,
                GdkAtom         target,
                guint32         time)
{
    table->drag_get_data_row = row;
    table->drag_get_data_col = col;
    gtk_drag_get_data(GTK_WIDGET(table),
              context,
              target,
              time);
    
}

void e_table_drag_highlight   (ETable     *table,
                   int         row,
                   int         col) /* col == -1 to highlight entire row. */
{
}

void e_table_drag_unhighlight (ETable     *table)
{
}

void e_table_drag_dest_set   (ETable               *table,
                  GtkDestDefaults       flags,
                  const GtkTargetEntry *targets,
                  gint                  n_targets,
                  GdkDragAction         actions)
{
    gtk_drag_dest_set(GTK_WIDGET(table),
              flags,
              targets,
              n_targets,
              actions);
}

void e_table_drag_dest_set_proxy (ETable         *table,
                  GdkWindow      *proxy_window,
                  GdkDragProtocol protocol,
                  gboolean        use_coordinates)
{
    gtk_drag_dest_set_proxy(GTK_WIDGET(table),
                proxy_window,
                protocol,
                use_coordinates);
}

/* There probably should be functions for setting the targets
 * as a GtkTargetList
 */

void e_table_drag_dest_unset (GtkWidget          *widget)
{
    gtk_drag_dest_unset(widget);
}

/* Source side */

void e_table_drag_source_set  (ETable               *table,
                   GdkModifierType       start_button_mask,
                   const GtkTargetEntry *targets,
                   gint                  n_targets,
                   GdkDragAction         actions)
{
    gtk_drag_source_set(GTK_WIDGET(table),
                start_button_mask,
                targets,
                n_targets,
                actions);
}

void e_table_drag_source_unset (ETable        *table)
{
    gtk_drag_source_unset(GTK_WIDGET(table));
}

/* There probably should be functions for setting the targets
 * as a GtkTargetList
 */

GdkDragContext *
e_table_drag_begin (ETable            *table,
            int                row,
            int                col,
            GtkTargetList     *targets,
            GdkDragAction      actions,
            gint               button,
            GdkEvent          *event)
{
    table->drag_row = row;
    table->drag_col = col;

    return gtk_drag_begin(GTK_WIDGET(table),
                  targets,
                  actions,
                  button,
                  event);
}

static void
e_table_compute_location(ETable *table,
             GtkWidget *widget,
             int x,
             int y,
             int *row,
             int *col)
{
    if (!(row || col))
        return;
    if (row)
        *row = 0;
    if (col)
        *col = 0;
}

static void
et_drag_begin (GtkWidget *widget,
           GdkDragContext *context,
           ETable *et)
{
    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [TABLE_DRAG_BEGIN],
             et->drag_row,
             et->drag_col,
             context);
}

static void
et_drag_end (GtkWidget *widget,
         GdkDragContext *context,
         ETable *et)
{
    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [TABLE_DRAG_END],
             et->drag_row,
             et->drag_col,
             context);
}

static void 
et_drag_data_get(GtkWidget *widget,
         GdkDragContext *context,
         GtkSelectionData *selection_data,
         guint info,
         guint time,
         ETable *et)
{
    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [TABLE_DRAG_DATA_GET],
             et->drag_row,
             et->drag_col,
             context,
             selection_data,
             info,
             time);
}

static void 
et_drag_data_delete(GtkWidget *widget,
            GdkDragContext *context,
            ETable *et)
{
    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [TABLE_DRAG_DATA_DELETE],
             et->drag_row,
             et->drag_col,
             context);
}

static void 
et_drag_leave(GtkWidget *widget,
          GdkDragContext *context,
          guint time,
          ETable *et)
{
    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [TABLE_DRAG_LEAVE],
             et->drop_row,
             et->drop_col,
             context,
             time);
    et->drop_row = -1;
    et->drop_col = -1;
}

static gboolean
et_drag_motion(GtkWidget *widget,
           GdkDragContext *context,
           gint x,
           gint y,
           guint time,
           ETable *et)
{
    gboolean ret_val;
    int row, col;
    e_table_compute_location(et,
                 widget,
                 x,
                 y,
                 &row,
                 &col);
    if (et->drop_row >= 0 && et->drop_col >= 0 &&
        row != et->drop_row && col != et->drop_row) {
        gtk_signal_emit (GTK_OBJECT (et),
                 et_signals [TABLE_DRAG_LEAVE],
                 et->drop_row,
                 et->drop_col,
                 context,
                 time);
    }
    et->drop_row = row;
    et->drop_col = col;
    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [TABLE_DRAG_MOTION],
             et->drop_row,
             et->drop_col,
             context,
             x,
             y,
             time,
             &ret_val);
    return ret_val;
}

static gboolean
et_drag_drop(GtkWidget *widget,
         GdkDragContext *context,
         gint x,
         gint y,
         guint time,
         ETable *et)
{
    gboolean ret_val;
    int row, col;
    e_table_compute_location(et,
                 widget,
                 x,
                 y,
                 &row,
                 &col);
    if (et->drop_row >= 0 && et->drop_col >= 0 &&
        row != et->drop_row && col != et->drop_row) {
        gtk_signal_emit (GTK_OBJECT (et),
                 et_signals [TABLE_DRAG_LEAVE],
                 et->drop_row,
                 et->drop_col,
                 context,
                 time);
        gtk_signal_emit (GTK_OBJECT (et),
                 et_signals [TABLE_DRAG_MOTION],
                 row,
                 col,
                 context,
                 x,
                 y,
                 time,
                 &ret_val);
    }
    et->drop_row = row;
    et->drop_col = col;
    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [TABLE_DRAG_DROP],
             et->drop_row,
             et->drop_col,
             context,
             x,
             y,
             time,
             &ret_val);
    et->drop_row = -1;
    et->drop_col = -1;
    return ret_val;
}

static void
et_drag_data_received(GtkWidget *widget,
              GdkDragContext *context,
              gint x,
              gint y,
              GtkSelectionData *selection_data,
              guint info,
              guint time,
              ETable *et)
{
    int row, col;
    e_table_compute_location(et,
                 widget,
                 x,
                 y,
                 &row,
                 &col);
    gtk_signal_emit (GTK_OBJECT (et),
             et_signals [TABLE_DRAG_MOTION],
             row,
             col,
             context,
             x,
             y,
             selection_data,
             info,
             time);
}

static void
e_table_class_init (GtkObjectClass *object_class)
{
    ETableClass *klass = E_TABLE_CLASS(object_class);
    GtkWidgetClass *widget_class = GTK_WIDGET_CLASS(object_class);

    e_table_parent_class = gtk_type_class (PARENT_TYPE);

    object_class->destroy        = et_destroy;
    object_class->set_arg        = et_set_arg;
    object_class->get_arg        = et_get_arg;

    klass->row_selection         = NULL;
    klass->cursor_change         = NULL;
    klass->double_click          = NULL;
    klass->right_click           = NULL;
    klass->key_press             = NULL;

    klass->table_drag_begin              = NULL;
    klass->table_drag_end                = NULL;
    klass->table_drag_data_get           = NULL;
    klass->table_drag_data_delete        = NULL;

    klass->table_drag_leave                = NULL;
    klass->table_drag_motion               = NULL;
    klass->table_drag_drop                 = NULL;
    klass->table_drag_data_received        = NULL;

    et_signals [ROW_SELECTION] =
        gtk_signal_new ("row_selection",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableClass, row_selection),
                gtk_marshal_NONE__INT_INT,
                GTK_TYPE_NONE, 2, GTK_TYPE_INT, GTK_TYPE_INT);

    et_signals [CURSOR_CHANGE] =
        gtk_signal_new ("cursor_change",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableClass, cursor_change),
                gtk_marshal_NONE__INT,
                GTK_TYPE_NONE, 1, GTK_TYPE_INT);

    et_signals [DOUBLE_CLICK] =
        gtk_signal_new ("double_click",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableClass, double_click),
                gtk_marshal_NONE__INT,
                GTK_TYPE_NONE, 1, GTK_TYPE_INT);

    et_signals [RIGHT_CLICK] =
        gtk_signal_new ("right_click",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableClass, right_click),
                e_marshal_INT__INT_INT_POINTER,
                GTK_TYPE_INT, 3, GTK_TYPE_INT, GTK_TYPE_INT, GTK_TYPE_POINTER);

    et_signals [KEY_PRESS] =
        gtk_signal_new ("key_press",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableClass, key_press),
                e_marshal_INT__INT_INT_POINTER,
                GTK_TYPE_INT, 3, GTK_TYPE_INT, GTK_TYPE_INT, GTK_TYPE_POINTER);

    et_signals[TABLE_DRAG_BEGIN] =
        gtk_signal_new ("table_drag_begin",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableClass, table_drag_begin),
                gtk_marshal_NONE__INT_INT_POINTER,
                GTK_TYPE_NONE, 3,
                GTK_TYPE_INT,
                GTK_TYPE_INT,
                GTK_TYPE_GDK_DRAG_CONTEXT);
    et_signals[TABLE_DRAG_END] =
        gtk_signal_new ("table_drag_end",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableClass, table_drag_end),
                gtk_marshal_NONE__INT_INT_POINTER,
                GTK_TYPE_NONE, 3,
                GTK_TYPE_INT,
                GTK_TYPE_INT,
                GTK_TYPE_GDK_DRAG_CONTEXT);
    et_signals[TABLE_DRAG_DATA_GET] =
        gtk_signal_new ("table_drag_data_get",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableClass, table_drag_data_get),
                e_marshal_NONE__INT_INT_POINTER_POINTER_UINT_UINT,
                GTK_TYPE_NONE, 6,
                GTK_TYPE_INT,
                GTK_TYPE_INT,
                GTK_TYPE_GDK_DRAG_CONTEXT,
                GTK_TYPE_SELECTION_DATA,
                GTK_TYPE_UINT,
                GTK_TYPE_UINT);
    et_signals[TABLE_DRAG_DATA_DELETE] =
        gtk_signal_new ("table_drag_data_delete",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableClass, table_drag_data_delete),
                gtk_marshal_NONE__INT_INT_POINTER,
                GTK_TYPE_NONE, 3,
                GTK_TYPE_INT,
                GTK_TYPE_INT,
                GTK_TYPE_GDK_DRAG_CONTEXT);

    et_signals[TABLE_DRAG_LEAVE] =
        gtk_signal_new ("table_drag_leave",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableClass, table_drag_leave),
                e_marshal_NONE__INT_INT_POINTER_UINT,
                GTK_TYPE_NONE, 4,
                GTK_TYPE_INT,
                GTK_TYPE_INT,
                GTK_TYPE_GDK_DRAG_CONTEXT,
                GTK_TYPE_UINT);
    et_signals[TABLE_DRAG_MOTION] =
        gtk_signal_new ("table_drag_motion",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableClass, table_drag_motion),
                e_marshal_BOOL__INT_INT_POINTER_INT_INT_UINT,
                GTK_TYPE_BOOL, 6,
                GTK_TYPE_INT,
                GTK_TYPE_INT,
                GTK_TYPE_GDK_DRAG_CONTEXT,
                GTK_TYPE_INT,
                GTK_TYPE_INT,
                GTK_TYPE_UINT);
    et_signals[TABLE_DRAG_DROP] =
        gtk_signal_new ("table_drag_drop",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableClass, table_drag_drop),
                e_marshal_BOOL__INT_INT_POINTER_INT_INT_UINT,
                GTK_TYPE_BOOL, 6,
                GTK_TYPE_INT,
                GTK_TYPE_INT,
                GTK_TYPE_GDK_DRAG_CONTEXT,
                GTK_TYPE_INT,
                GTK_TYPE_INT,
                GTK_TYPE_UINT);
    et_signals[TABLE_DRAG_DATA_RECEIVED] =
        gtk_signal_new ("table_drag_data_received",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableClass, table_drag_data_received),
                e_marshal_NONE__INT_INT_POINTER_INT_INT_POINTER_UINT_UINT,
                GTK_TYPE_NONE, 8,
                GTK_TYPE_INT,
                GTK_TYPE_INT,
                GTK_TYPE_GDK_DRAG_CONTEXT,
                GTK_TYPE_INT,
                GTK_TYPE_INT,
                GTK_TYPE_SELECTION_DATA,
                GTK_TYPE_UINT,
                GTK_TYPE_UINT);
    
    gtk_object_class_add_signals (object_class, et_signals, LAST_SIGNAL);

    klass->set_scroll_adjustments = set_scroll_adjustments;
    
    widget_class->set_scroll_adjustments_signal =
        gtk_signal_new ("set_scroll_adjustments",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableClass, set_scroll_adjustments),
                gtk_marshal_NONE__POINTER_POINTER,
                GTK_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);
    
    gtk_object_add_arg_type ("ETable::drawgrid", GTK_TYPE_BOOL,
                 GTK_ARG_READWRITE, ARG_TABLE_DRAW_GRID);
    gtk_object_add_arg_type ("ETable::drawfocus", GTK_TYPE_BOOL,
                 GTK_ARG_READWRITE, ARG_TABLE_DRAW_FOCUS);
    gtk_object_add_arg_type ("ETable::cursor_mode", GTK_TYPE_INT,
                 GTK_ARG_WRITABLE, ARG_CURSOR_MODE);
    gtk_object_add_arg_type ("ETable::length_threshold", GTK_TYPE_INT,
                 GTK_ARG_WRITABLE, ARG_LENGTH_THRESHOLD);
    gtk_object_add_arg_type ("ETable::click_to_add_message", GTK_TYPE_STRING,
                 GTK_ARG_READWRITE, ARG_CLICK_TO_ADD_MESSAGE);
}

E_MAKE_TYPE(e_table, "ETable", ETable, e_table_class_init, e_table_init, PARENT_TYPE);