path: root/widgets/misc/e-image-chooser.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* e-image-chooser.c
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 * Author: Chris Toshok <toshok@ximian.com>
 *
 * This library 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 library; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#include <config.h>

#include <stdio.h>
#include <string.h>

#include <glib/gi18n.h>

#include "e-image-chooser.h"
#include "e-util/e-util-marshal.h"
#include "e-util/e-icon-factory.h"
#include "e-util/e-util.h"

struct _EImageChooserPrivate {

    GtkWidget *frame;
    GtkWidget *image;
    GtkWidget *browse_button;

    char *image_buf;
    int   image_buf_size;
    int   image_width;
    int   image_height;

    gboolean editable;
};

enum {
    CHANGED,
    LAST_SIGNAL
};


static gint image_chooser_signals [LAST_SIGNAL] = { 0 };

static void e_image_chooser_init     (EImageChooser      *chooser);
static void e_image_chooser_class_init   (EImageChooserClass     *klass);
#if 0
static void e_image_chooser_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
static void e_image_chooser_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
#endif
static void e_image_chooser_dispose      (GObject *object);

static gboolean image_drag_motion_cb (GtkWidget *widget,
                      GdkDragContext *context,
                      gint x, gint y, guint time, EImageChooser *chooser);
static void image_drag_leave_cb (GtkWidget *widget,
                 GdkDragContext *context,
                 guint time, EImageChooser *chooser);
static gboolean image_drag_drop_cb (GtkWidget *widget,
                    GdkDragContext *context,
                    gint x, gint y, guint time, EImageChooser *chooser);
static void image_drag_data_received_cb (GtkWidget *widget,
                     GdkDragContext *context,
                     gint x, gint y,
                     GtkSelectionData *selection_data,
                     guint info, guint time, EImageChooser *chooser);

static GtkObjectClass *parent_class = NULL;
#define PARENT_TYPE GTK_TYPE_VBOX

enum DndTargetType {
    DND_TARGET_TYPE_URI_LIST
};
#define URI_LIST_TYPE "text/uri-list"

static GtkTargetEntry image_drag_types[] = {
    { URI_LIST_TYPE, 0, DND_TARGET_TYPE_URI_LIST },
};
static const int num_image_drag_types = sizeof (image_drag_types) / sizeof (image_drag_types[0]);

GtkWidget *
e_image_chooser_new (void)
{
    return g_object_new (E_TYPE_IMAGE_CHOOSER, NULL);
}

GType
e_image_chooser_get_type (void)
{
    static GType eic_type = 0;

    if (!eic_type) {
        static const GTypeInfo eic_info =  {
            sizeof (EImageChooserClass),
            NULL,           /* base_init */
            NULL,           /* base_finalize */
            (GClassInitFunc) e_image_chooser_class_init,
            NULL,           /* class_finalize */
            NULL,           /* class_data */
            sizeof (EImageChooser),
            0,             /* n_preallocs */
            (GInstanceInitFunc) e_image_chooser_init,
        };

        eic_type = g_type_register_static (PARENT_TYPE, "EImageChooser", &eic_info, 0);
    }

    return eic_type;
}


static void
e_image_chooser_class_init (EImageChooserClass *klass)
{
    GObjectClass *object_class = G_OBJECT_CLASS (klass);

    parent_class = g_type_class_ref (PARENT_TYPE);

    image_chooser_signals [CHANGED] =
        g_signal_new ("changed",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_FIRST,
                  G_STRUCT_OFFSET (EImageChooserClass, changed),
                  NULL, NULL,
                  g_cclosure_marshal_VOID__VOID,
                  G_TYPE_NONE, 0);

    /*
    object_class->set_property = e_image_chooser_set_property;
    object_class->get_property = e_image_chooser_get_property;
    */
    object_class->dispose = e_image_chooser_dispose;
}

#ifdef UI_CHANGE_OK
static void
browse_for_image_cb (GtkWidget *button, gpointer data)
{
}
#endif

static void
e_image_chooser_init (EImageChooser *chooser)
{
    EImageChooserPrivate *priv;
    GtkWidget *alignment;

    priv = chooser->priv = g_new0 (EImageChooserPrivate, 1);

    alignment = gtk_alignment_new (0, 0, 0, 0);
    priv->frame = gtk_frame_new ("");
    priv->image = gtk_image_new ();

    gtk_container_add (GTK_CONTAINER (alignment), priv->image);

#ifdef UI_CHANGE_OK
    priv->browse_button = gtk_button_new_with_label (_("Choose Image"));
#endif

    gtk_frame_set_shadow_type (GTK_FRAME (priv->frame), GTK_SHADOW_NONE);

    gtk_container_add (GTK_CONTAINER (priv->frame), alignment);
    gtk_box_set_homogeneous (GTK_BOX (chooser), FALSE);
    gtk_box_pack_start (GTK_BOX (chooser), priv->frame, TRUE, TRUE, 0);
#ifdef UI_CHANGE_OK
    gtk_box_pack_start (GTK_BOX (chooser), priv->browse_button, FALSE, FALSE, 0);

    g_signal_connect (priv->browse_button, "clicked", G_CALLBACK (browse_for_image_cb), NULL);
#endif

    gtk_drag_dest_set (priv->image, 0, image_drag_types, num_image_drag_types, GDK_ACTION_COPY);
    g_signal_connect (priv->image,
              "drag_motion", G_CALLBACK (image_drag_motion_cb), chooser);
    g_signal_connect (priv->image,
              "drag_leave", G_CALLBACK (image_drag_leave_cb), chooser);
    g_signal_connect (priv->image,
              "drag_drop", G_CALLBACK (image_drag_drop_cb), chooser);
    g_signal_connect (priv->image,
              "drag_data_received", G_CALLBACK (image_drag_data_received_cb), chooser);

    gtk_widget_show_all (priv->frame);
#ifdef UI_CHANGE_OK
    gtk_widget_show (priv->browse_button);
#endif

    /* we default to being editable */
    priv->editable = TRUE;
}

static void
e_image_chooser_dispose (GObject *object)
{
    EImageChooser *eic = E_IMAGE_CHOOSER (object);

    if (eic->priv) {
        EImageChooserPrivate *priv = eic->priv;

        if (priv->image_buf) {
            g_free (priv->image_buf);
            priv->image_buf = NULL;
        }

        g_free (eic->priv);
        eic->priv = NULL;
    }

    if (G_OBJECT_CLASS (parent_class)->dispose)
        (* G_OBJECT_CLASS (parent_class)->dispose) (object);
}


static gboolean
set_image_from_data (EImageChooser *chooser,
             char *data, int length)
{
    gboolean rv = FALSE;
    GdkPixbufLoader *loader = gdk_pixbuf_loader_new ();
    GdkPixbuf *pixbuf;

    gdk_pixbuf_loader_write (loader, (unsigned char *)data, length, NULL);
    gdk_pixbuf_loader_close (loader, NULL);

    pixbuf = gdk_pixbuf_loader_get_pixbuf (loader);
    if (pixbuf)
        g_object_ref (pixbuf);

    g_object_unref (loader);

    if (pixbuf) {
        GdkPixbuf *scaled;
        GdkPixbuf *composite;

        float scale;
        int new_height, new_width;

        new_height = gdk_pixbuf_get_height (pixbuf);
        new_width = gdk_pixbuf_get_width (pixbuf);

        printf ("new dimensions = (%d,%d)\n", new_width, new_height);

        if (chooser->priv->image_height == 0
            && chooser->priv->image_width == 0) {
            printf ("initial setting of an image.  no scaling\n");
            scale = 1.0;
        }
        else if (chooser->priv->image_height < new_height
             || chooser->priv->image_width < new_width) {
            /* we need to scale down */
            printf ("we need to scale down\n");
            if (new_height > new_width)
                scale = (float)chooser->priv->image_height / new_height;
            else
                scale = (float)chooser->priv->image_width / new_width;
        }
        else {
            /* we need to scale up */
            printf ("we need to scale up\n");
            if (new_height > new_width)
                scale = (float)new_height / chooser->priv->image_height;
            else
                scale = (float)new_width / chooser->priv->image_width;
        }

        printf ("scale = %g\n", scale);

        if (scale == 1.0) {
            gtk_image_set_from_pixbuf (GTK_IMAGE (chooser->priv->image), pixbuf);

            chooser->priv->image_width = new_width;
            chooser->priv->image_height = new_height;
        }
        else {
            new_width *= scale;
            new_height *= scale;
            new_width = MIN (new_width, chooser->priv->image_width);
            new_height = MIN (new_height, chooser->priv->image_height);

            printf ("new scaled dimensions = (%d,%d)\n", new_width, new_height);

            scaled = e_icon_factory_pixbuf_scale (pixbuf, new_width, new_height);

            composite = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, gdk_pixbuf_get_bits_per_sample (pixbuf),
                            chooser->priv->image_width, chooser->priv->image_height);

            gdk_pixbuf_fill (composite, 0x00000000);

            gdk_pixbuf_copy_area (scaled, 0, 0, new_width, new_height,
                          composite,
                          chooser->priv->image_width / 2 - new_width / 2,
                          chooser->priv->image_height / 2 - new_height / 2);

            gtk_image_set_from_pixbuf (GTK_IMAGE (chooser->priv->image), composite);
            g_object_unref (scaled);
            g_object_unref (composite);
        }

        g_object_unref (pixbuf);

        g_free (chooser->priv->image_buf);
        chooser->priv->image_buf = data;
        chooser->priv->image_buf_size = length;

        g_signal_emit (chooser,
                   image_chooser_signals [CHANGED], 0);

        rv = TRUE;
    }

    return rv;
}

static gboolean
image_drag_motion_cb (GtkWidget *widget,
              GdkDragContext *context,
              gint x, gint y, guint time, EImageChooser *chooser)
{
    GList *p;

    if (!chooser->priv->editable)
        return FALSE;

    for (p = context->targets; p != NULL; p = p->next) {
        char *possible_type;

        possible_type = gdk_atom_name (GDK_POINTER_TO_ATOM (p->data));
        if (!strcmp (possible_type, URI_LIST_TYPE)) {
            g_free (possible_type);
            gdk_drag_status (context, GDK_ACTION_COPY, time);
            gtk_frame_set_shadow_type (GTK_FRAME (chooser->priv->frame), GTK_SHADOW_IN);
            return TRUE;
        }

        g_free (possible_type);
    }

    gtk_frame_set_shadow_type (GTK_FRAME (chooser->priv->frame), GTK_SHADOW_NONE);
    return FALSE;
}

static void
image_drag_leave_cb (GtkWidget *widget,
             GdkDragContext *context,
             guint time, EImageChooser *chooser)
{
    gtk_frame_set_shadow_type (GTK_FRAME (chooser->priv->frame), GTK_SHADOW_NONE);
}

static gboolean
image_drag_drop_cb (GtkWidget *widget,
            GdkDragContext *context,
            gint x, gint y, guint time, EImageChooser *chooser)
{
    GList *p;

    if (!chooser->priv->editable)
        return FALSE;

    if (context->targets == NULL) {
        gtk_frame_set_shadow_type (GTK_FRAME (chooser->priv->frame), GTK_SHADOW_NONE);
        return FALSE;
    }

    for (p = context->targets; p != NULL; p = p->next) {
        char *possible_type;

        possible_type = gdk_atom_name (GDK_POINTER_TO_ATOM (p->data));
        if (!strcmp (possible_type, URI_LIST_TYPE)) {
            g_free (possible_type);
            gtk_drag_get_data (widget, context,
                       GDK_POINTER_TO_ATOM (p->data),
                       time);
            gtk_frame_set_shadow_type (GTK_FRAME (chooser->priv->frame), GTK_SHADOW_NONE);
            return TRUE;
        }

        g_free (possible_type);
    }

    gtk_frame_set_shadow_type (GTK_FRAME (chooser->priv->frame), GTK_SHADOW_NONE);
    return FALSE;
}

static void
image_drag_data_received_cb (GtkWidget *widget,
                 GdkDragContext *context,
                 gint x, gint y,
                 GtkSelectionData *selection_data,
                 guint info, guint time, EImageChooser *chooser)
{
    char *target_type;
    gboolean handled = FALSE;

    target_type = gdk_atom_name (selection_data->target);

    if (!strcmp (target_type, URI_LIST_TYPE)) {
        GError *error = NULL;
        char *uri;
        char *nl = strstr ((char *)selection_data->data, "\r\n");
        char *buf = NULL;
        gsize read = 0;

        if (nl)
            uri = g_strndup ((char *)selection_data->data, nl - (char*)selection_data->data);
        else
            uri = g_strdup ((char *)selection_data->data);

        if (e_util_read_file (uri, TRUE, &buf, &read, &error) && read > 0 && buf) {
            if (set_image_from_data (chooser, buf, read)) {
                handled = TRUE;
            }
        }

        g_free (buf);
        g_free (uri);

        if (error) {
            g_warning ("%s", error->message);
            g_error_free (error);
        }
    }

    gtk_drag_finish (context, handled, FALSE, time);
}



gboolean
e_image_chooser_set_from_file (EImageChooser *chooser, const char *filename)
{
    gchar *data;
    gsize data_length;

    g_return_val_if_fail (E_IS_IMAGE_CHOOSER (chooser), FALSE);
    g_return_val_if_fail (filename, FALSE);

    if (!g_file_get_contents (filename, &data, &data_length, NULL)) {
        return FALSE;
    }

    if (!set_image_from_data (chooser, data, data_length))
        g_free (data);

    return TRUE;
}

void
e_image_chooser_set_editable (EImageChooser *chooser, gboolean editable)
{
    g_return_if_fail (E_IS_IMAGE_CHOOSER (chooser));

    chooser->priv->editable = editable;

    gtk_widget_set_sensitive (chooser->priv->browse_button, editable);
}

gboolean
e_image_chooser_get_image_data (EImageChooser *chooser, char **data, gsize *data_length)
{
    g_return_val_if_fail (E_IS_IMAGE_CHOOSER (chooser), FALSE);
    g_return_val_if_fail (data != NULL, FALSE);
    g_return_val_if_fail (data_length != NULL, FALSE);

    *data_length = chooser->priv->image_buf_size;
    *data = g_malloc (*data_length);
    memcpy (*data, chooser->priv->image_buf, *data_length);

    return TRUE;
}

gboolean
e_image_chooser_set_image_data (EImageChooser *chooser, char *data, gsize data_length)
{
    char *buf;

    g_return_val_if_fail (E_IS_IMAGE_CHOOSER (chooser), FALSE);
    g_return_val_if_fail (data != NULL, FALSE);

    /* yuck, a copy... */
    buf = g_malloc (data_length);
    memcpy (buf, data, data_length);

    if (!set_image_from_data (chooser, buf, data_length)) {
        g_free (buf);
        return FALSE;
    }

    return TRUE;
}