path: root/widgets/table/e-cell-toggle.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* 
 * e-cell-toggle.c - Multi-state image toggle cell object.
 * Copyright 1999, 2000, Ximian, Inc.
 *
 * Authors:
 *   Miguel de Icaza <miguel@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 <gtk/gtkenums.h>
#include <gtk/gtkentry.h>
#include <gtk/gtkwindow.h>
#include <gtk/gtksignal.h>
#include <gdk/gdkkeysyms.h>
#include <libgnomeui/gnome-canvas.h>
#include "e-cell-toggle.h"
#include "gal/util/e-util.h"
#include "e-table-item.h"

#define PARENT_TYPE e_cell_get_type ()

typedef struct {
    ECellView    cell_view;
    GdkGC       *gc;
    GnomeCanvas *canvas;
} ECellToggleView;

static ECellClass *parent_class;

/*
 * ECell::realize method
 */
static ECellView *
etog_new_view (ECell *ecell, ETableModel *table_model, void *e_table_item_view)
{
    ECellToggleView *toggle_view = g_new0 (ECellToggleView, 1);
    ETableItem *eti = E_TABLE_ITEM (e_table_item_view);
    GnomeCanvas *canvas = GNOME_CANVAS_ITEM (eti)->canvas;

    toggle_view->cell_view.ecell = ecell;
    toggle_view->cell_view.e_table_model = table_model;
    toggle_view->cell_view.e_table_item_view = e_table_item_view;
    toggle_view->canvas = canvas;

    return (ECellView *) toggle_view;
}

static void
etog_kill_view (ECellView *ecell_view)
{
    g_free (ecell_view);
}   

static void
etog_realize (ECellView *ecell_view)
{
    ECellToggleView *toggle_view = (ECellToggleView *) ecell_view;

    toggle_view->gc = gdk_gc_new (GTK_WIDGET (toggle_view->canvas)->window);
}

/*
 * ECell::unrealize method
 */
static void
etog_unrealize (ECellView *ecv)
{
    ECellToggleView *toggle_view = (ECellToggleView *) ecv;

    gdk_gc_unref (toggle_view->gc);
    toggle_view->gc = NULL;
}

/*
 * ECell::draw method
 */
static void
etog_draw (ECellView *ecell_view, GdkDrawable *drawable,
      int model_col, int view_col, int row, ECellFlags flags,
      int x1, int y1, int x2, int y2)
{
    ECellToggle *toggle = E_CELL_TOGGLE (ecell_view->ecell);
    gboolean selected;
#if 0
    ECellToggleView *toggle_view = (ECellToggleView *) ecell_view;
#endif
    GdkPixbuf *image;
    int x, y, width, height;
    
    const int value = GPOINTER_TO_INT (
         e_table_model_value_at (ecell_view->e_table_model, model_col, row));
    
    selected = flags & E_CELL_SELECTED;

    if (value >= toggle->n_states){
        g_warning ("Value from the table model is %d, the states we support are [0..%d)\n",
               value, toggle->n_states);
        return;
    }

    image = toggle->images [value];

    if ((x2 - x1) < gdk_pixbuf_get_width (image)){
        x = x1;
        width = x2 - x1;
    } else {
        x = x1 + ((x2 - x1) - gdk_pixbuf_get_width (image)) / 2;
        width = gdk_pixbuf_get_width (image);
    }

    if ((y2 - y1) < gdk_pixbuf_get_height (image)){
        y = y1;
        height = y2 - y1;
    } else {
        y = y1 + ((y2 - y1) - gdk_pixbuf_get_height (image)) / 2;
        height = gdk_pixbuf_get_height (image);
    }

#if 0 /* do alpha */
    if (gdk_pixbuf_get_has_alpha (image)) {
        flat = gdk_pixbuf_composite_color_simple (
            image,
            gdk_pixbuf_get_width (image),
            gdk_pixbuf_get_height (image),
            GDK_INTERP_NEAREST,
            255,
            32,
            0xffffff, 0xffffff);    
        
        gdk_pixbuf_render_to_drawable (flat, drawable,
                           toggle_view->gc,
                           0, 0,
                           x, y,
                           width, height,
                           GDK_RGB_DITHER_NORMAL,
                           0, 0);
        gdk_pixbuf_unref (flat);
    } else {
        gdk_pixbuf_render_to_drawable (image, drawable,
                           toggle_view->gc,
                           0, 0,
                           x, y,
                           width, height,
                           GDK_RGB_DITHER_NORMAL,
                           0, 0);
    }
#else 
    gdk_pixbuf_render_to_drawable_alpha (image, drawable,
                         0, 0,
                         x, y,
                         width, height,
                         GDK_PIXBUF_ALPHA_BILEVEL,
                         128,
                         GDK_RGB_DITHER_NORMAL,
                         x, y);
#endif
}

static void
etog_set_value (ECellToggleView *toggle_view, int model_col, int view_col, int row, int value)
{
    ECell *ecell = toggle_view->cell_view.ecell;
    ECellToggle *toggle = E_CELL_TOGGLE (ecell);

    if (value >= toggle->n_states)
        value = 0;

    e_table_model_set_value_at (toggle_view->cell_view.e_table_model,
                    model_col, row, GINT_TO_POINTER (value));
}

/*
 * ECell::event method
 */
static gint
etog_event (ECellView *ecell_view, GdkEvent *event, int model_col, int view_col, int row, ECellFlags flags, ECellActions *actions)
{
    ECellToggleView *toggle_view = (ECellToggleView *) ecell_view;
    void *_value = e_table_model_value_at (ecell_view->e_table_model, model_col, row);
    const int value = GPOINTER_TO_INT (_value);

#if 0
    if (!(flags & E_CELL_EDITING))
        return FALSE;
#endif

    switch (event->type){
    case GDK_KEY_PRESS:
        if (event->key.keyval != GDK_space)
            return FALSE;
        /* Fall through */
    case GDK_BUTTON_PRESS:
        if (!e_table_model_is_cell_editable(ecell_view->e_table_model, model_col, row))
            return FALSE;
        
        etog_set_value (toggle_view, model_col, view_col, row, value + 1);
        return TRUE;

    default:
        return FALSE;
    }
    return TRUE;
}

/*
 * ECell::height method
 */
static int
etog_height (ECellView *ecell_view, int model_col, int view_col, int row)
{
    ECellToggle *toggle = E_CELL_TOGGLE (ecell_view->ecell);

    return toggle->height;
}

/*
 * ECell::max_width method
 */
static int
etog_max_width (ECellView *ecell_view, int model_col, int view_col)
{
    ECellToggle *toggle = E_CELL_TOGGLE (ecell_view->ecell);
    int max_width = 0;
    int number_of_rows;
    int row;

    number_of_rows = e_table_model_row_count (ecell_view->e_table_model);
    for (row = 0; row < number_of_rows; row++) {
        void *value = e_table_model_value_at (ecell_view->e_table_model,
                              model_col, row);
        max_width = MAX (max_width, gdk_pixbuf_get_width (toggle->images[GPOINTER_TO_INT (value)]));
    }

    return max_width;
}

static void
etog_destroy (GtkObject *object)
{
    ECellToggle *etog = E_CELL_TOGGLE (object);
    int i;
    
    for (i = 0; i < etog->n_states; i++)
        gdk_pixbuf_unref (etog->images [i]);

    g_free (etog->images);

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

static void
e_cell_toggle_class_init (GtkObjectClass *object_class)
{
    ECellClass *ecc = (ECellClass *) object_class;

    object_class->destroy = etog_destroy;

    ecc->new_view   = etog_new_view;
    ecc->kill_view  = etog_kill_view;
    ecc->realize    = etog_realize;
    ecc->unrealize  = etog_unrealize;
    ecc->draw       = etog_draw;
    ecc->event      = etog_event;
    ecc->height     = etog_height;
    ecc->max_width  = etog_max_width;

    parent_class = gtk_type_class (PARENT_TYPE);
}

E_MAKE_TYPE(e_cell_toggle, "ECellToggle", ECellToggle, e_cell_toggle_class_init, NULL, PARENT_TYPE);

/**
 * e_cell_toggle_construct:
 * @etog: a fresh ECellToggle object
 * @border: number of pixels used as a border
 * @n_states: number of states the toggle will have
 * @images: a collection of @n_states images, one for each state.
 *
 * Constructs the @etog object with the @border, @n_staes, and @images
 * arguments.
 */
void
e_cell_toggle_construct (ECellToggle *etog, int border, int n_states, GdkPixbuf **images)
{
    int max_height =  0;
    int i;
    
    etog->border = border;
    etog->n_states = n_states;

    etog->images = g_new (GdkPixbuf *, n_states);

    for (i = 0; i < n_states; i++){
        etog->images [i] = images [i];
        gdk_pixbuf_ref (images [i]);

        if (gdk_pixbuf_get_height (images [i]) > max_height)
          max_height = gdk_pixbuf_get_height (images [i]);
    }

    etog->height = max_height;
}

/**
 * e_cell_checkbox_new:
 * @border: number of pixels used as a border
 * @n_states: number of states the toggle will have
 * @images: a collection of @n_states images, one for each state.
 *
 * Creates a new ECell renderer that can be used to render toggle
 * buttons with the images specified in @images.  The value returned 
 * by ETableModel::get_value is typecase into an integer and clamped
 * to the [0..n_states) range.  That will select the image rendered.
 * 
 * Returns: an ECell object that can be used to render multi-state
 * toggle cells.
 */
ECell *
e_cell_toggle_new (int border, int n_states, GdkPixbuf **images)
{
    ECellToggle *etog = gtk_type_new (e_cell_toggle_get_type ());

    e_cell_toggle_construct (etog, border, n_states, images);

    return (ECell *) etog;
}