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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-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"

#define COLUMN_HEADER_HEIGHT 16
#define TITLE_HEIGHT         16
#define GROUP_INDENT         10

#define PARENT_TYPE gtk_table_get_type ()

static GtkObjectClass *e_table_parent_class;

enum {
    ROW_SELECTION,
    LAST_SIGNAL
};

enum {
    ARG_0,
    ARG_TABLE_DRAW_GRID,
    ARG_TABLE_DRAW_FOCUS
};

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_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);

    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;
    }
    
    (*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->draw_grid = 1;
    e_table->draw_focus = 1;
    e_table->spreadsheet = 1;
    
    e_table->need_rebuild = 0;
    e_table->rebuild_idle_id = 0;
}

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, COLUMN_HEADER_HEIGHT);
}

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

    gtk_object_set (GTK_OBJECT (e_table->group),
            "minimum_width", width,
            NULL);
    gtk_object_set (GTK_OBJECT (e_table->header),
            "width", width,
            NULL);
    
}

static void
table_canvas_reflow (GnomeCanvas *canvas, ETable *e_table)
{
    gdouble height, width;
    GtkAllocation *alloc = &(GTK_WIDGET (canvas)->allocation);

    gtk_object_get (GTK_OBJECT (e_table->group),
            "height", &height,
            "width", &width,
            NULL);
    /* 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, MAX((int)width, alloc->width) - 1, MAX ((int)height, alloc->height) - 1);
}

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);
}

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->table_canvas->root),
                           et->full_header,
                           et->header,
                           et->model,
                           et->sort_info,
                           0);
        gtk_signal_connect (GTK_OBJECT (et->group), "row_selection",
                    GTK_SIGNAL_FUNC (group_row_selection), et);
        e_table_fill_table (et, et->model);
        
        gtk_object_set (GTK_OBJECT (et->group),
                "minimum_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
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), "reflow",
                GTK_SIGNAL_FUNC (table_canvas_reflow), e_table);
                 
    gtk_widget_show (GTK_WIDGET (e_table->table_canvas));
    
    e_table->group = e_table_group_new (
        GNOME_CANVAS_GROUP (e_table->table_canvas->root),
        full_header, header,
        model, e_table->sort_info, 0);

    gtk_signal_connect (GTK_OBJECT (e_table->group), "row_selection",
                GTK_SIGNAL_FUNC(group_row_selection), 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;
    int no_header;
    int row = 0;
    
    GtkWidget *scrolledwindow;

    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->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);

    scrolledwindow = gtk_scrolled_window_new (
        gtk_layout_get_hadjustment (GTK_LAYOUT (e_table->table_canvas)),
        gtk_layout_get_vadjustment (GTK_LAYOUT (e_table->table_canvas)));

    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)));
                   
    
    gtk_scrolled_window_set_policy (
        GTK_SCROLLED_WINDOW (scrolledwindow),
        GTK_POLICY_AUTOMATIC,
        GTK_POLICY_AUTOMATIC);
    
    gtk_container_add (
        GTK_CONTAINER (scrolledwindow),
        GTK_WIDGET (e_table->table_canvas));
    gtk_widget_show (scrolledwindow);
    
    if (!no_header) {
        /*
         * The header
         */
        gtk_table_attach (
                  GTK_TABLE (e_table), GTK_WIDGET (e_table->header_canvas),
                  0, 1, 0, 1,
                  GTK_FILL | GTK_EXPAND,
                  GTK_FILL, 0, 0);
        row ++;
    }
    /*
     * The body
     */
    gtk_table_attach (
        GTK_TABLE (e_table), GTK_WIDGET (scrolledwindow),
        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_select_row (ETable *e_table, int row)
{
    
}

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;
    }
}

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

static void
leaf_bool_change (void *etgl, void *closure)
{
    bool_closure *bc = closure;
    
    gtk_object_set (GTK_OBJECT (etgl), bc->arg, bc->setting, NULL);
}

static void
et_set_arg (GtkObject *o, GtkArg *arg, guint arg_id)
{
    ETable *etable = E_TABLE (o);
    bool_closure bc;
    
    switch (arg_id){
    case ARG_TABLE_DRAW_GRID:
        etable->draw_grid = GTK_VALUE_BOOL (*arg);
        bc.arg = "drawgrid";
        bc.setting = etable->draw_grid;
        e_table_group_apply_to_leafs (etable->group, leaf_bool_change, &bc);
        break;

    case ARG_TABLE_DRAW_FOCUS:
        etable->draw_focus = GTK_VALUE_BOOL (*arg);
        bc.arg = "drawfocus";
        bc.setting = etable->draw_focus;
        e_table_group_apply_to_leafs (etable->group, leaf_bool_change, &bc);
        break;
    }
}
    
static void
e_table_class_init (GtkObjectClass *object_class)
{
    ETableClass *klass = E_TABLE_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;

    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);
    
    gtk_object_class_add_signals (object_class, et_signals, LAST_SIGNAL);

    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);
    
    
}

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