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/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* e-summary-title-buttons.c
 *
 * Authors: Iain Holmes <iain@ximian.com>
 *
 * Copyright (C) 2000  Ximian, Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * This program 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
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <libgnomeui/gnome-canvas-rect-ellipse.h>
#include <gal/util/e-util.h>

#include <gdk-pixbuf/gdk-pixbuf.h>

#include "e-summary-title-button.h"

#define PARENT_TYPE (gnome_canvas_rect_get_type ())

enum {
    ARG_0,
    ARG_PIXBUF,
    ARG_X,
    ARG_Y
};

enum {
    CLICKED,
    LAST_SIGNAL
};

static void e_summary_title_button_destroy (GtkObject *object);
static void e_summary_title_button_set_arg (GtkObject *object,
                        GtkArg *arg,
                        guint arg_id);
static void e_summary_title_button_get_arg (GtkObject *object,
                        GtkArg *arg,
                        guint arg_id);
static void e_summary_title_button_class_init (ESummaryTitleButtonClass *estb_class);
static void e_summary_title_button_init (ESummaryTitleButton *estb);
static double e_summary_title_button_point (GnomeCanvasItem *item,
                        double x,
                        double y,
                        int cx,
                        int cy,
                        GnomeCanvasItem **actual_item);
static void e_summary_title_button_update (GnomeCanvasItem *item,
                       double affine[6],
                       ArtSVP *clip_path,
                       gint flags);
static void e_summary_title_button_draw (GnomeCanvasItem *item,
                     GdkDrawable *drawable,
                     int x, int y,
                     int width, int height);
static gint e_summary_title_button_event (GnomeCanvasItem *item,
                      GdkEvent *event);

static GnomeCanvasRectClass *parent_class;
static guint estb_signals[LAST_SIGNAL] = { 0 };

struct _ESummaryTitleButtonPrivate {
    GdkPixbuf *pixbuf;
    double x, y;
    int width, height;

    int in_button : 1;
    int button_down : 1;
};

static void
e_summary_title_button_destroy (GtkObject *object)
{
    ESummaryTitleButton *estb;
    ESummaryTitleButtonPrivate *priv;
    
    estb = E_SUMMARY_TITLE_BUTTON (object);
    priv = estb->private;
    
    if (priv == NULL)
        return;
    
    gdk_pixbuf_unref (priv->pixbuf);
    
    g_free (priv);
    estb->private = NULL;
    
    if (GTK_OBJECT_CLASS (parent_class)->destroy)
        (* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
}

static void
e_summary_title_button_set_arg (GtkObject *object,
                GtkArg *arg,
                guint arg_id)
{
    ESummaryTitleButton *estb;
    ESummaryTitleButtonPrivate *priv;
    gboolean update = FALSE;
    
    estb = E_SUMMARY_TITLE_BUTTON (object);
    priv = estb->private;
    
    switch (arg_id) {
    case ARG_PIXBUF:
        if (priv->pixbuf)
            gdk_pixbuf_unref (priv->pixbuf);
        
        priv->pixbuf = GTK_VALUE_POINTER (*arg);
        gdk_pixbuf_ref (priv->pixbuf);
        
        priv->width = gdk_pixbuf_get_width (priv->pixbuf);
        priv->height = gdk_pixbuf_get_height (priv->pixbuf);
        
        update = TRUE;
        break;
        
    case ARG_X: 
        priv->x = GTK_VALUE_DOUBLE (*arg);
        break;
        
    case ARG_Y:
        priv->y = GTK_VALUE_DOUBLE (*arg);
        break;
        
    default:
        break;
        
    }
    
    if (update)
        gnome_canvas_item_request_update (GNOME_CANVAS_ITEM (estb));
    
}

static void
e_summary_title_button_get_arg (GtkObject *object,
                GtkArg *arg,
                guint arg_id)
{
    ESummaryTitleButton *estb;
    ESummaryTitleButtonPrivate *priv;
    
    estb = E_SUMMARY_TITLE_BUTTON (object);
    priv = estb->private;
    
    switch (arg_id) {
    case ARG_PIXBUF:
        GTK_VALUE_POINTER (*arg) = priv->pixbuf;
        break;
        
    case ARG_X:
        GTK_VALUE_DOUBLE (*arg) = priv->x;
        break;
        
    case ARG_Y:
        GTK_VALUE_DOUBLE (*arg) = priv->y;
        break;
        
    default:
        arg->type = GTK_TYPE_INVALID;
        break;
        
    }
}

static void
e_summary_title_button_init (ESummaryTitleButton *estb)
{
    estb->private = g_new0 (ESummaryTitleButtonPrivate, 1);
}

static void
e_summary_title_button_class_init (ESummaryTitleButtonClass *estb_class)
{
    GtkObjectClass *object_class;
    GnomeCanvasItemClass *item_class;
    
    object_class = (GtkObjectClass *) estb_class;
    item_class = (GnomeCanvasItemClass *) estb_class;
    
    object_class->destroy = e_summary_title_button_destroy;
    object_class->set_arg = e_summary_title_button_set_arg;
    object_class->get_arg = e_summary_title_button_get_arg;
    
    item_class->draw = e_summary_title_button_draw;
    item_class->point = e_summary_title_button_point;
    item_class->update = e_summary_title_button_update;
    item_class->event = e_summary_title_button_event;
    
    gtk_object_add_arg_type ("ESummaryTitleButton::pixbuf",
                 GTK_TYPE_POINTER,
                 GTK_ARG_READWRITE,
                 ARG_PIXBUF);
    gtk_object_add_arg_type ("ESummaryTitleButton::x",
                 GTK_TYPE_DOUBLE,
                 GTK_ARG_READWRITE,
                 ARG_X);
    gtk_object_add_arg_type ("ESummaryTitleButton::y",
                 GTK_TYPE_DOUBLE,
                 GTK_ARG_READWRITE,
                 ARG_Y);
    estb_signals[CLICKED] = gtk_signal_new ("clicked", GTK_RUN_LAST,
                        object_class->type,
                        GTK_SIGNAL_OFFSET (ESummaryTitleButtonClass,
                                   clicked),
                        gtk_marshal_NONE__NONE,
                        GTK_TYPE_NONE, 0);
    gtk_object_class_add_signals (object_class, estb_signals, LAST_SIGNAL);
    
    parent_class = gtk_type_class (PARENT_TYPE);
}

E_MAKE_TYPE (e_summary_title_button, "ESummaryTitleButton", 
         ESummaryTitleButton, e_summary_title_button_class_init,
         e_summary_title_button_init, PARENT_TYPE);

static double
e_summary_title_button_point (GnomeCanvasItem *item,
                  double x,
                  double y,
                  int cx,
                  int cy,
                  GnomeCanvasItem **actual_item)
{
    ESummaryTitleButton *estb;
    ESummaryTitleButtonPrivate *priv;
    double d = 1.0;
    
    estb = E_SUMMARY_TITLE_BUTTON (item);
    priv = estb->private;
    
    if (x >= priv->x && x <= priv->x + gdk_pixbuf_get_width (priv->pixbuf)
        && y >= priv->y && y <= priv->y + gdk_pixbuf_get_height (priv->pixbuf)) {
        d = 0.0;
        *actual_item = item;
    }

    return d;
}

static void
get_bounds (ESummaryTitleButton *estb,
        double *px1, double *py1,
        double *px2, double *py2)
{
    GnomeCanvasItem *item;
    ESummaryTitleButtonPrivate *priv;
    double x1, y1, x2, y2;
    int cx1, cy1, cx2, cy2;
    
    item = GNOME_CANVAS_ITEM (estb);
    priv = estb->private;
    
    x1 = priv->x;
    y1 = priv->y;
    x2 = x1 + priv->width;
    y2 = y1 + priv->height;
    
    gnome_canvas_item_i2w (item, &x1, &y1);
    gnome_canvas_item_i2w (item, &x2, &x2);
    gnome_canvas_w2c (item->canvas, x1, y1, &cx1, &cy1);
    gnome_canvas_w2c (item->canvas, x2, y2, &cx2, &cy2);
    
    *px1 = cx1;
    *py1 = cy1;
    *px2 = cx2;
    *py2 = cy2;
}

static void
e_summary_title_button_update (GnomeCanvasItem *item,
                   double affine[6],
                   ArtSVP *clip_path,
                   gint flags)
{
    ESummaryTitleButton *estb;
    ESummaryTitleButtonPrivate *priv;
    double x1, y1, x2, y2;
    
    estb = E_SUMMARY_TITLE_BUTTON (item);
    priv = estb->private;
    
    get_bounds (estb, &x1, &y1, &x2, &y2);
    gnome_canvas_update_bbox (item, (int) x1, (int) y1, (int) x2, (int) y2);
}

static void
e_summary_title_button_draw (GnomeCanvasItem *item,
                 GdkDrawable *drawable,
                 int x, int y,
                 int width, int height)
{
    ESummaryTitleButton *estb;
    ESummaryTitleButtonPrivate *priv;
    double i2w[6], w2c[6], i2c[6];
    int x1, x2, y1, y2;
    ArtPoint i1, i2;
    ArtPoint c1, c2;
    GdkGC *gc;
    
    estb = E_SUMMARY_TITLE_BUTTON (item);
    priv = estb->private;
    
    if (GNOME_CANVAS_ITEM_CLASS (parent_class)->draw)
        (* GNOME_CANVAS_ITEM_CLASS (parent_class)->draw) (item, drawable, x, y, width, height);
    
    gnome_canvas_item_i2w_affine (item, i2w);
    gnome_canvas_w2c_affine (item->canvas, w2c);
    art_affine_multiply (i2c, i2w, w2c);
    
    i1.x = priv->x;
    i1.y = priv->y;
    i2.x = i1.x + priv->width + 4;
    i2.y = i1.y + priv->height + 4;
    art_affine_point (&c1, &i1, i2c);
    art_affine_point (&c2, &i2, i2c);
    x1 = c1.x;
    y1 = c1.y;
    x2 = c2.x;
    y2 = c2.y;
    
    gc = gdk_gc_new (item->canvas->layout.bin_window);
    gdk_draw_rectangle (drawable, gc,
                FALSE, x1 - x,
                y1 - y,
                x2 - x1,
                y2 - y1);
    gdk_gc_unref (gc);
    
    gdk_pixbuf_render_to_drawable_alpha (priv->pixbuf,
                         drawable,
                         0, 0,
                         x1 + 2, y1 + 2,
                         priv->width, priv->height,
                         GDK_PIXBUF_ALPHA_BILEVEL,
                         127,
                         GDK_RGB_DITHER_NORMAL,
                         0, 0);
}

static gint
e_summary_title_button_event (GnomeCanvasItem *item,
                  GdkEvent *event)
{
    ESummaryTitleButton *estb;
    ESummaryTitleButtonPrivate *priv;

    estb = E_SUMMARY_TITLE_BUTTON (item);
    priv = estb->private;

    switch (event->type) {
    case GDK_ENTER_NOTIFY:
        priv->in_button = TRUE;
        break;

    case GDK_LEAVE_NOTIFY:
        priv->in_button = FALSE;
        break;

    case GDK_BUTTON_PRESS:
        if (priv->in_button) {
            priv->button_down = TRUE;
            gnome_canvas_item_grab (item,
                        GDK_LEAVE_NOTIFY_MASK |
                        GDK_ENTER_NOTIFY_MASK |
                        GDK_POINTER_MOTION_MASK |
                        GDK_BUTTON_RELEASE_MASK,
                        NULL, event->button.time);
        }
        break;
    
    case GDK_BUTTON_RELEASE:
        priv->button_down = FALSE;
        gnome_canvas_item_ungrab (item, event->button.time);

        if (priv->in_button) {
            gtk_signal_emit (GTK_OBJECT (estb), estb_signals[CLICKED]);
        }
        break;
        
    default:
        return TRUE;
    }

    return FALSE;
}