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 <gdk/gdkkeysyms.h>
#include <gtk/gtk.h>
#include <libgnomecanvas/gnome-canvas.h>

#include "a11y/e-table/gal-a11y-e-cell-toggle.h"
#include "a11y/e-table/gal-a11y-e-cell-registry.h"
#include "e-util/e-util.h"
#include "misc/e-hsv-utils.h"

#include "e-cell-toggle.h"
#include "e-table-item.h"

#define PARENT_TYPE e_cell_get_type ()

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

static ECellClass *parent_class;

#define CACHE_SEQ_COUNT 6

static int
gnome_print_pixbuf (GnomePrintContext *pc, GdkPixbuf *pixbuf)
{
       if (gdk_pixbuf_get_has_alpha (pixbuf))
               return gnome_print_rgbaimage  (pc,
                          gdk_pixbuf_get_pixels    (pixbuf),
                          gdk_pixbuf_get_width     (pixbuf),
                          gdk_pixbuf_get_height    (pixbuf),
                          gdk_pixbuf_get_rowstride (pixbuf));
       else
               return gnome_print_rgbimage  (pc,
                         gdk_pixbuf_get_pixels    (pixbuf),
                         gdk_pixbuf_get_width     (pixbuf),
                         gdk_pixbuf_get_height    (pixbuf),
                         gdk_pixbuf_get_rowstride (pixbuf));
}

/*
 * 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;
    ECellToggle *etog = E_CELL_TOGGLE (ecell);
    int i;

    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;
    toggle_view->pixmap_cache = g_new (GdkPixmap *, etog->n_states * CACHE_SEQ_COUNT);
    for (i = 0; i < etog->n_states * CACHE_SEQ_COUNT; i++)
        toggle_view->pixmap_cache[i] = NULL;

    return (ECellView *) toggle_view;
}

static void
etog_kill_view (ECellView *ecell_view)
{
    ECellToggle *etog = E_CELL_TOGGLE (ecell_view->ecell);
    ECellToggleView *toggle_view = (ECellToggleView *) ecell_view;
    int i;

    for (i = 0; i < etog->n_states * CACHE_SEQ_COUNT; i++)
        if (toggle_view->pixmap_cache[i])
            gdk_pixmap_unref (toggle_view->pixmap_cache[i]);
    g_free (toggle_view->pixmap_cache);
    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;
}

#define PIXMAP_CACHE(toggle_view, cache_seq, image_seq) ((toggle_view)->pixmap_cache[(cache_seq) * E_CELL_TOGGLE (((ECellView *) (toggle_view))->ecell)->n_states + (image_seq)])

#define RGB_COLOR(color) (((color).red & 0xff00) << 8 | \
               ((color).green & 0xff00) | \
               ((color).blue & 0xff00) >> 8)

static void
check_cache (ECellToggleView *toggle_view, int image_seq, int cache_seq)
{
    ECellView *ecell_view = (ECellView *) toggle_view;
    ECellToggle *etog = E_CELL_TOGGLE (ecell_view->ecell);

    if (PIXMAP_CACHE (toggle_view, cache_seq, image_seq) == NULL) {
        GdkPixbuf *image = etog->images[image_seq];
        GdkPixbuf *flat;
        GdkColor  color;
        int width = gdk_pixbuf_get_width (image);
        int height = gdk_pixbuf_get_height (image);

        PIXMAP_CACHE (toggle_view, cache_seq, image_seq) =
            gdk_pixmap_new (toggle_view->canvas->layout.bin_window, width, height,
                    gtk_widget_get_visual (GTK_WIDGET (toggle_view->canvas))->depth);

        
        switch (cache_seq % 3) {
        case 0:
            color = GTK_WIDGET (toggle_view->canvas)->style->bg [GTK_STATE_SELECTED];
            break;
        case 1:
            color = GTK_WIDGET (toggle_view->canvas)->style->bg [GTK_STATE_ACTIVE];
            break;
        case 2:
            color = GTK_WIDGET (toggle_view->canvas)->style->base [GTK_STATE_NORMAL];
            break;
        }

        if (cache_seq >= 3) {
            e_hsv_tweak (&color, 0.0f, 0.0f, -0.07f);
        }

        flat = gdk_pixbuf_composite_color_simple (image,
                              width, height,
                              GDK_INTERP_BILINEAR,
                              255,
                              1,
                              RGB_COLOR (color), RGB_COLOR (color));

        gdk_pixbuf_render_to_drawable (flat, PIXMAP_CACHE (toggle_view, cache_seq, image_seq),
                           toggle_view->gc,
                           0, 0,
                           0, 0,
                           width, height,
                           GDK_RGB_DITHER_NORMAL,
                           0, 0);
        gdk_pixbuf_unref (flat);
    }
}

/*
 * 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);
    ECellToggleView *toggle_view = (ECellToggleView *) ecell_view;
    GdkPixmap *pixmap;
    GdkPixbuf *image;
    int x, y, width, height;
    int cache_seq;
    
    const int value = GPOINTER_TO_INT (
         e_table_model_value_at (ecell_view->e_table_model, model_col, row));
    
    if (value < 0 || 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;
    }

    if (flags & E_CELL_SELECTED) {
        if (GTK_WIDGET_HAS_FOCUS (toggle_view->canvas))
            cache_seq = 0;
        else
            cache_seq = 1;
    } else
        cache_seq = 2;

    if (E_TABLE_ITEM (ecell_view->e_table_item_view)->alternating_row_colors && (row % 2) == 0)
        cache_seq += 3;

    check_cache (toggle_view, value, cache_seq);

    pixmap = PIXMAP_CACHE (toggle_view, cache_seq, value);
    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);
    }

    gdk_draw_pixmap  (drawable, toggle_view->gc,
              pixmap,
              0, 0,
              x, y,
              width, height);
}

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;
    }
}

/*
 * 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::print method
 */
static void
etog_print (ECellView *ecell_view, GnomePrintContext *context, 
        int model_col, int view_col, int row,
        double width, double height)
{
    ECellToggle *toggle = E_CELL_TOGGLE(ecell_view->ecell);
    GdkPixbuf *image;
    const int value = GPOINTER_TO_INT (
        e_table_model_value_at (ecell_view->e_table_model, model_col, row));

    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;
    }

    gnome_print_gsave(context);

    image = toggle->images[value];

    gnome_print_translate (context, 0, (height - toggle->height) / 2);
    gnome_print_scale (context, toggle->height, toggle->height);
    gnome_print_pixbuf (context, image);
    
    gnome_print_grestore(context);
}

static gdouble
etog_print_height (ECellView *ecell_view, GnomePrintContext *context, 
           int model_col, int view_col, int row,
           double width)
{
    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_style_set (ECellView *ecell_view, GtkStyle *previous_style)
{
    ECellToggle *toggle = E_CELL_TOGGLE (ecell_view->ecell);
    ECellToggleView *toggle_view = (ECellToggleView *) ecell_view;
    int i;

    for (i = 0; i < toggle->n_states * CACHE_SEQ_COUNT; i++) {
        if (toggle_view->pixmap_cache[i]) {
            gdk_pixmap_unref (toggle_view->pixmap_cache[i]);
            toggle_view->pixmap_cache[i] = NULL;
        }
    }
}

static void
etog_finalize (GObject *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);

    etog->images = NULL;
    etog->n_states = 0;

    G_OBJECT_CLASS (parent_class)->finalize (object);
}

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

    G_OBJECT_CLASS (object_class)->finalize = etog_finalize;

    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->print      = etog_print;
    ecc->print_height = etog_print_height;
    ecc->max_width  = etog_max_width;
    ecc->style_set  = etog_style_set;

    parent_class = g_type_class_ref (PARENT_TYPE);
    gal_a11y_e_cell_registry_add_cell_type (NULL,
                                                E_CELL_TOGGLE_TYPE,
                                                gal_a11y_e_cell_toggle_new);
}

static void
e_cell_toggle_init (GtkObject *object)
{
    ECellToggle *etog = (ECellToggle *) object;

    etog->images = NULL;
    etog->n_states = 0;
}

E_MAKE_TYPE(e_cell_toggle, "ECellToggle", ECellToggle, e_cell_toggle_class_init, e_cell_toggle_init, 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 = g_object_new (E_CELL_TOGGLE_TYPE, NULL);

    e_cell_toggle_construct (etog, border, n_states, images);

    return (ECell *) etog;
}