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

/*
 * e-cell-toggle.c: Multi-state image toggle cell object.
 *
 * Author:
 *   Miguel de Icaza (miguel@kernel.org)
 *
 * (C) 1999 Helix Code, Inc
 */
#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 "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;

static void
etog_queue_redraw (ECellToggleView *text_view, int view_col, int view_row)
{
    e_table_item_redraw_range (
        text_view->cell_view.e_table_item_view,
        view_col, view_row, view_col, view_row);
}

/*
 * 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, gboolean selected,
      int x1, int y1, int x2, int y2)
{
    ECellToggle *toggle = E_CELL_TOGGLE (ecell_view->ecell);
    ECellToggleView *toggle_view = (ECellToggleView *) ecell_view;
    GdkPixbuf *image;
    ArtPixBuf *art;
    int x, y, width, height;
    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;
    }

    /*
     * Paint the background
     */
    gdk_draw_rectangle (drawable, GTK_WIDGET (toggle_view->canvas)->style->white_gc, TRUE, x1, y1, x2 - x1, y2 - y1);
                
    image = toggle->images [value];
    art = image->art_pixbuf;

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

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

    width = y2 - y1;

    if (image->art_pixbuf->has_alpha){
        GdkColor background;
        guchar *buffer;
        int alpha, ix, iy;

        buffer = g_malloc (art->rowstride * art->height * 3);

        background.red = 255;
        background.green = 255;
        background.blue = 255;
        
        for (iy = 0; iy < art->height; iy++){
            unsigned char *dest;
            unsigned char *src;
        
            dest = buffer + (iy * art->rowstride);
            src = art->pixels + (iy * art->rowstride);

            for (ix = 0; ix < art->width; ix++){
                alpha = src [3];
                if (alpha == 0){
                    *dest++ = background.red;
                    *dest++ = background.green;
                    *dest++ = background.blue;
                    src += 3;
                } else if (alpha == 255){
                    *dest++ = *src++;
                    *dest++ = *src++;
                    *dest++ = *src++;
                } else {
                    *dest++ = (background.red +   ((*src++ - background.red) * alpha + 0x80)) >> 8;
                    *dest++ = (background.green + ((*src++ - background.green) * alpha + 0x80)) >> 8;
                    *dest++ = (background.blue +  ((*src++ - background.blue) * alpha + 0x80)) >> 8;
                }
                src++;
            }
        }
        
        gdk_draw_rgb_image_dithalign (
            drawable, toggle_view->gc, x, y, width, height,
            GDK_RGB_DITHER_NORMAL, buffer, art->rowstride, 0, 0);

        g_free (buffer);
    } else
        gdk_draw_rgb_image_dithalign (
            drawable, toggle_view->gc, x, y, width, height,
            GDK_RGB_DITHER_NORMAL, art->pixels, art->rowstride, 0, 0);
}

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));
    etog_queue_redraw (toggle_view, view_col, row);
}

/*
 * ECell::event method
 */
static gint
etog_event (ECellView *ecell_view, GdkEvent *event, int model_col, int view_col, int row)
{
    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);
    
    switch (event->type){
    case GDK_BUTTON_RELEASE:
        etog_set_value (toggle_view, model_col, view_col, row, value + 1);
        return TRUE;

    case GDK_KEY_PRESS:
        if (event->key.keyval == GDK_space){
            etog_set_value (toggle_view, model_col, view_col, row, value + 1);
            return TRUE;
        }
        return FALSE;
        
    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;
}

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;

    parent_class = gtk_type_class (PARENT_TYPE);
}

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

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 (images [i]->art_pixbuf->height > max_height)
            max_height = images [i]->art_pixbuf->height;
    }

    etog->height = max_height;
}

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;
}