path: root/shell/e-storage-set-view.c

/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* e-storage-set-view.c
 *
 * Copyright (C) 2000  Helix Code, Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * 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.
 *
 * Author: Ettore Perazzoli
 */

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

#include <gnome.h>

#include "e-util/e-util.h"
#include "e-shell-constants.h"

#include "e-storage-set-view.h"


#define PARENT_TYPE GTK_TYPE_CTREE
static GtkCTreeClass *parent_class = NULL;

struct _EStorageSetViewPrivate {
    EStorageSet *storage_set;

    /* These tables must always be kept in sync, and one cannot exist
           without the other, as they share the dynamically allocated path.  */
    GHashTable *ctree_node_to_path;
    GHashTable *path_to_ctree_node;

    /* Path of the row selected by the latest "tree_select_row" signal.  */
    const char *selected_row_path;

    /* Path of the row currently being dragged.  */
    const char *dragged_row_path;

    /* Path of the row that was selected before the latest click.  */
    const char *selected_row_path_before_click;

    /* Whether we are currently performing a drag from this view.  */
    int in_drag : 1;

    /* Button used for the drag.  This is initialized in the `button_press_event'
           handler.  */
    int drag_button;
};


enum {
    FOLDER_SELECTED,
    LAST_SIGNAL
};

static guint signals[LAST_SIGNAL] = { 0 };


/* DND stuff.  */

enum _DndTargetType {
    DND_TARGET_TYPE_URI_LIST,
    DND_TARGET_TYPE_E_SHORTCUT
};
typedef enum _DndTargetType DndTargetType;

#define URI_LIST_TYPE   "text/uri-list"
#define E_SHORTCUT_TYPE "E-SHORTCUT"

static GtkTargetEntry drag_types [] = {
    { URI_LIST_TYPE, 0, DND_TARGET_TYPE_URI_LIST },
    { E_SHORTCUT_TYPE, 0, DND_TARGET_TYPE_E_SHORTCUT }
};
static const int num_drag_types = sizeof (drag_types) / sizeof (drag_types[0]);

static GtkTargetList *target_list;


/* GtkObject methods.  */

static void
hash_foreach_free_path (gpointer key,
            gpointer value,
            gpointer data)
{
    g_free (value);
}

static void
destroy (GtkObject *object)
{
    EStorageSetView *storage_set_view;
    EStorageSetViewPrivate *priv;

    storage_set_view = E_STORAGE_SET_VIEW (object);
    priv = storage_set_view->priv;

    gtk_object_unref (GTK_OBJECT (priv->storage_set));

    g_hash_table_foreach (priv->ctree_node_to_path, hash_foreach_free_path, NULL);
    g_hash_table_destroy (priv->ctree_node_to_path);
    g_hash_table_destroy (priv->path_to_ctree_node);

    g_free (priv);

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


/* GtkWidget methods.  */

static int
button_press_event (GtkWidget *widget,
            GdkEventButton *event)
{
    EStorageSetView *storage_set_view;
    EStorageSetViewPrivate *priv;

    storage_set_view = E_STORAGE_SET_VIEW (widget);
    priv = storage_set_view->priv;

    priv->selected_row_path_before_click = priv->selected_row_path;

    (* GTK_WIDGET_CLASS (parent_class)->button_press_event) (widget, event);

    if (priv->in_drag)
        return FALSE;

    priv->drag_button = event->button;

    /* KLUDGE ALERT.  So look at this.  We need to grab the pointer now, to check for
           motion events and maybe start a drag operation.  And GtkCTree seems to do it
           already in the `button_press_event'.  *But* for some reason something is very
           broken somewhere and the grab misbehaves when done by GtkCTree's
           `button_press_event'.  So we have to ungrab the pointer and re-grab it our way.
           Weee!  */

    gdk_pointer_ungrab (GDK_CURRENT_TIME);
    gdk_flush ();
    gtk_grab_remove (widget);

    gdk_pointer_grab (GTK_CLIST (widget)->clist_window, FALSE,
              GDK_POINTER_MOTION_MASK | GDK_BUTTON_RELEASE_MASK,
              NULL, NULL, event->time);
    gtk_grab_add (widget);

    return TRUE;
}

static int
motion_notify_event (GtkWidget *widget,
             GdkEventMotion *event)
{
    EStorageSetView *storage_set_view;
    EStorageSetViewPrivate *priv;

    if (event->window != GTK_CLIST (widget)->clist_window)
        return (* GTK_WIDGET_CLASS (parent_class)->motion_notify_event) (widget, event);

    storage_set_view = E_STORAGE_SET_VIEW (widget);
    priv = storage_set_view->priv;

    if (priv->in_drag || priv->drag_button == 0)
        return FALSE;

    priv->in_drag = TRUE;
    priv->dragged_row_path = priv->selected_row_path;

    gtk_drag_begin (widget, target_list, GDK_ACTION_MOVE,
            priv->drag_button, (GdkEvent *) event);

    return TRUE;
}

static int
button_release_event (GtkWidget *widget,
              GdkEventButton *event)
{
    EStorageSetView *storage_set_view;
    EStorageSetViewPrivate *priv;

    if (event->window != GTK_CLIST (widget)->clist_window)
        return (* GTK_WIDGET_CLASS (parent_class)->button_release_event) (widget, event);

    storage_set_view = E_STORAGE_SET_VIEW (widget);
    priv = storage_set_view->priv;

    if (! priv->in_drag && priv->selected_row_path != NULL) {
        gdk_pointer_ungrab (GDK_CURRENT_TIME);
        gtk_grab_remove (widget);
        gdk_flush ();

        gtk_signal_emit (GTK_OBJECT (widget), signals[FOLDER_SELECTED],
                 priv->selected_row_path);
        priv->selected_row_path = NULL;
    }

    priv->selected_row_path_before_click = NULL;

    return TRUE;
}

static void
drag_end (GtkWidget *widget,
      GdkDragContext *context)
{
    EStorageSetView *storage_set_view;
    EStorageSetViewPrivate *priv;

    storage_set_view = E_STORAGE_SET_VIEW (widget);
    priv = storage_set_view->priv;

    if (priv->dragged_row_path != NULL)
        e_storage_set_view_set_current_folder (storage_set_view,
                               priv->selected_row_path_before_click);

    priv->in_drag = FALSE;
    priv->drag_button = 0;
    priv->dragged_row_path = NULL;
}

static void
set_uri_list_selection (EStorageSetView *storage_set_view,
            GtkSelectionData *selection_data)
{
    EStorageSetViewPrivate *priv;
    char *uri_list;

    priv = storage_set_view->priv;

    /* FIXME: Get `evolution:' from somewhere instead of hardcoding it here.  */
    uri_list = g_strconcat ("evolution:", priv->selected_row_path, "\n", NULL);
    gtk_selection_data_set (selection_data, selection_data->target,
                8, (guchar *) uri_list, strlen (uri_list));
    g_free (uri_list);
}

static void
set_e_shortcut_selection (EStorageSetView *storage_set_view,
              GtkSelectionData *selection_data)
{
    EStorageSetViewPrivate *priv;
    int shortcut_len;
    char *shortcut;
    const char *trailing_slash;
    const char *name;

    priv = storage_set_view->priv;

    trailing_slash = strrchr (priv->selected_row_path, '/');
    if (trailing_slash == NULL)
        name = NULL;
    else
        name = trailing_slash + 1;

    /* FIXME: Get `evolution:' from somewhere instead of hardcoding it here.  */

    if (name != NULL)
        shortcut_len = strlen (name);
    else
        shortcut_len = 0;
    
    shortcut_len ++;    /* Separating zero.  */

    shortcut_len += strlen ("evolution:");
    shortcut_len += strlen (priv->selected_row_path);
    shortcut_len ++;    /* Trailing zero.  */

    shortcut = g_malloc (shortcut_len);

    if (name == NULL)
        sprintf (shortcut, "%cevolution:%s", '\0', priv->selected_row_path);
    else
        sprintf (shortcut, "%s%cevolution:%s", name, '\0', priv->selected_row_path);

    gtk_selection_data_set (selection_data, selection_data->target,
                8, (guchar *) shortcut, shortcut_len);

    g_free (shortcut);
}

static void
drag_data_get (GtkWidget *widget,
           GdkDragContext *context,
           GtkSelectionData *selection_data,
           guint info,
           guint32 time)
{
    EStorageSetView *storage_set_view;

    storage_set_view = E_STORAGE_SET_VIEW (widget);

    switch (info) {
    case DND_TARGET_TYPE_URI_LIST:
        set_uri_list_selection (storage_set_view, selection_data);
        break;
    case DND_TARGET_TYPE_E_SHORTCUT:
        set_e_shortcut_selection (storage_set_view, selection_data);
        break;
    default:
        g_assert_not_reached ();
    }
}


/* GtkCTree methods.  */

static void
tree_select_row (GtkCTree *ctree,
         GtkCTreeNode *row,
         gint column)
{
    EStorageSetView *storage_set_view;
    EStorageSetViewPrivate *priv;
    const char *path;

    (* GTK_CTREE_CLASS (parent_class)->tree_select_row) (ctree, row, column);

    storage_set_view = E_STORAGE_SET_VIEW (ctree);
    priv = storage_set_view->priv;

    path = g_hash_table_lookup (storage_set_view->priv->ctree_node_to_path, row);
    if (path == NULL)
        return;

    priv->selected_row_path = path;
}


static void
class_init (EStorageSetViewClass *klass)
{
    GtkObjectClass *object_class;
    GtkWidgetClass *widget_class;
    GtkCTreeClass *ctree_class;

    parent_class = gtk_type_class (gtk_ctree_get_type ());

    object_class = GTK_OBJECT_CLASS (klass);
    object_class->destroy = destroy;

    widget_class = GTK_WIDGET_CLASS (klass);
    widget_class->button_press_event   = button_press_event;
    widget_class->motion_notify_event  = motion_notify_event;
    widget_class->button_release_event = button_release_event;
    widget_class->drag_end             = drag_end;
    widget_class->drag_data_get        = drag_data_get;

    ctree_class = GTK_CTREE_CLASS (klass);
    ctree_class->tree_select_row = tree_select_row;

    signals[FOLDER_SELECTED]
        = gtk_signal_new ("folder_selected",
                  GTK_RUN_FIRST,
                  object_class->type,
                  GTK_SIGNAL_OFFSET (EStorageSetViewClass, folder_selected),
                  gtk_marshal_NONE__STRING,
                  GTK_TYPE_NONE, 1,
                  GTK_TYPE_STRING);

    gtk_object_class_add_signals (object_class, signals, LAST_SIGNAL);

    /* Set up DND.  */

    target_list = gtk_target_list_new (drag_types, num_drag_types);
    g_assert (target_list != NULL);
}

static void
init (EStorageSetView *storage_set_view)
{
    EStorageSetViewPrivate *priv;

    /* Avoid GtkCTree's broken focusing behavior.  FIXME: Other ways?  */
    GTK_WIDGET_UNSET_FLAGS (storage_set_view, GTK_CAN_FOCUS);

    priv = g_new (EStorageSetViewPrivate, 1);

    priv->storage_set                    = NULL;
    priv->ctree_node_to_path             = g_hash_table_new (g_direct_hash, g_direct_equal);
    priv->path_to_ctree_node             = g_hash_table_new (g_str_hash, g_str_equal);
    priv->selected_row_path              = NULL;
    priv->dragged_row_path               = NULL;
    priv->selected_row_path_before_click = NULL;
    priv->in_drag                        = FALSE;

    storage_set_view->priv = priv;
}


static void
get_pixmap_and_mask_for_folder (EStorageSetView *storage_set_view,
                EFolder *folder,
                GdkPixmap **pixmap_return,
                GdkBitmap **mask_return)
{
    EFolderTypeRegistry *folder_type_registry;
    EStorageSet *storage_set;
    const char *type_name;
    GdkPixbuf *icon_pixbuf;
    GdkPixbuf *scaled_pixbuf;
    GdkVisual *visual;
    GdkGC *gc;

    storage_set = storage_set_view->priv->storage_set;
    folder_type_registry = e_storage_set_get_folder_type_registry (storage_set);

    type_name = e_folder_get_type_string (folder);
    icon_pixbuf = e_folder_type_registry_get_icon_for_type (folder_type_registry,
                                type_name, TRUE);

    if (icon_pixbuf == NULL) {
        *pixmap_return = NULL;
        *mask_return = NULL;
        return;
    }

    scaled_pixbuf = gdk_pixbuf_new (gdk_pixbuf_get_colorspace (icon_pixbuf),
                    gdk_pixbuf_get_has_alpha (icon_pixbuf),
                    gdk_pixbuf_get_bits_per_sample (icon_pixbuf),
                    E_SHELL_MINI_ICON_SIZE, E_SHELL_MINI_ICON_SIZE);

    gdk_pixbuf_scale (icon_pixbuf, scaled_pixbuf,
              0, 0, E_SHELL_MINI_ICON_SIZE, E_SHELL_MINI_ICON_SIZE,
              0.0, 0.0,
              (double) E_SHELL_MINI_ICON_SIZE / gdk_pixbuf_get_width (icon_pixbuf),
              (double) E_SHELL_MINI_ICON_SIZE / gdk_pixbuf_get_height (icon_pixbuf),
              GDK_INTERP_HYPER);

    visual = gdk_rgb_get_visual ();
    *pixmap_return = gdk_pixmap_new (NULL,
                     E_SHELL_MINI_ICON_SIZE, E_SHELL_MINI_ICON_SIZE,
                     visual->depth);

    gc = gdk_gc_new (*pixmap_return);
    gdk_pixbuf_render_to_drawable (scaled_pixbuf, *pixmap_return, gc, 0, 0, 0, 0,
                       E_SHELL_MINI_ICON_SIZE, E_SHELL_MINI_ICON_SIZE,
                       GDK_RGB_DITHER_NORMAL, 0, 0);
    gdk_gc_unref (gc);

    *mask_return = gdk_pixmap_new (NULL, E_SHELL_MINI_ICON_SIZE, E_SHELL_MINI_ICON_SIZE, 1);
    gdk_pixbuf_render_threshold_alpha (scaled_pixbuf, *mask_return,
                       0, 0, 0, 0,
                       E_SHELL_MINI_ICON_SIZE, E_SHELL_MINI_ICON_SIZE,
                       0x7f);

    gdk_pixbuf_unref (scaled_pixbuf);
}

static int
folder_compare_cb (gconstpointer a, gconstpointer b)
{
    EFolder *folder_a;
    EFolder *folder_b;
    const char *name_a;
    const char *name_b;

    folder_a = E_FOLDER (a);
    folder_b = E_FOLDER (b);

    name_a = e_folder_get_name (folder_a);
    name_b = e_folder_get_name (folder_b);

    return strcmp (name_a, name_b);
}

static void
insert_folders (EStorageSetView *storage_set_view,
        GtkCTreeNode *parent,
        EStorage *storage,
        const char *path,
        int level)
{
    EStorageSetViewPrivate *priv;
    GtkCTree *ctree;
    GtkCTreeNode *node;
    GList *folder_list;
    GList *p;
    const char *storage_name;

    ctree = GTK_CTREE (storage_set_view);
    priv = storage_set_view->priv;

    storage_name = e_storage_get_name (storage);

    folder_list = e_storage_list_folders (storage, path);
    if (folder_list == NULL)
        return;

    folder_list = g_list_sort (folder_list, folder_compare_cb);

    for (p = folder_list; p != NULL; p = p->next) {
        EFolder *folder;
        const char *folder_name;
        char *text[2];
        char *subpath;
        char *full_path;
        GdkPixmap *pixmap;
        GdkBitmap *mask;

        folder = E_FOLDER (p->data);
        folder_name = e_folder_get_name (folder);

        text[0] = (char *) folder_name; /* Yuck.  */
        text[1] = NULL;

        get_pixmap_and_mask_for_folder (storage_set_view, folder, &pixmap, &mask);

        node = gtk_ctree_insert_node (ctree, parent, NULL,
                          text, 3,
                          pixmap, mask, pixmap, mask,
                          FALSE, TRUE);

        subpath = g_concat_dir_and_file (path, folder_name);
        insert_folders (storage_set_view, node, storage, subpath, level + 1);

        full_path = g_strconcat("/", storage_name, subpath, NULL);
        g_hash_table_insert (priv->ctree_node_to_path, node, full_path);
        g_hash_table_insert (priv->path_to_ctree_node, full_path, node);

        g_free (subpath);
    }

    e_free_object_list (folder_list);
}

void
e_storage_set_view_construct (EStorageSetView *storage_set_view,
                  EStorageSet *storage_set)
{
    EStorageSetViewPrivate *priv;
    GtkCTreeNode *parent;
    GtkCTree *ctree;
    EStorage *storage;
    GList *storage_list;
    GList *p;
    const char *name;
    char *text[2];
    char *path;

    g_return_if_fail (storage_set_view != NULL);
    g_return_if_fail (E_IS_STORAGE_SET_VIEW (storage_set_view));
    g_return_if_fail (storage_set != NULL);
    g_return_if_fail (E_IS_STORAGE_SET (storage_set));

    ctree = GTK_CTREE (storage_set_view);

    /* Set up GtkCTree/GtkCList parameters.  */
    gtk_ctree_construct (ctree, 1, 0, NULL);
    /* This looks ugly with Helix GNOME unless we do this. */
    gtk_ctree_set_line_style (ctree, GTK_CTREE_LINES_NONE);
    gtk_ctree_set_expander_style (ctree, GTK_CTREE_EXPANDER_TRIANGLE);
    gtk_clist_set_selection_mode (GTK_CLIST (ctree), GTK_SELECTION_BROWSE);
    gtk_clist_set_row_height (GTK_CLIST (ctree), E_SHELL_MINI_ICON_SIZE);
    
    priv = storage_set_view->priv;

    gtk_object_ref (GTK_OBJECT (storage_set));
    priv->storage_set = storage_set;
    
    storage_list = e_storage_set_get_storage_list (storage_set);

    text[1] = NULL;

    for (p = storage_list; p != NULL; p = p->next) {
        storage = E_STORAGE (p->data);

        name = e_storage_get_name (storage);
        text[0] = (char *) name; /* Yuck.  */

        parent = gtk_ctree_insert_node (ctree, NULL, NULL,
                        text, 3,
                        NULL, NULL, NULL, NULL,
                        FALSE, TRUE);

        path = g_strconcat ("/", name, NULL);
        g_hash_table_insert (priv->ctree_node_to_path, parent, path);
        g_hash_table_insert (priv->path_to_ctree_node, parent, path);

        insert_folders (storage_set_view, parent, storage, "/", 1);
    }

    e_free_object_list (storage_list);
}

GtkWidget *
e_storage_set_view_new (EStorageSet *storage_set)
{
    GtkWidget *new;

    g_return_val_if_fail (storage_set != NULL, NULL);
    g_return_val_if_fail (E_IS_STORAGE_SET (storage_set), NULL);

    new = gtk_type_new (e_storage_set_view_get_type ());
    e_storage_set_view_construct (E_STORAGE_SET_VIEW (new), storage_set);

    return new;
}


void
e_storage_set_view_set_current_folder (EStorageSetView *storage_set_view,
                       const char *path)
{
    EStorageSetViewPrivate *priv;
    GtkCTreeNode *node;

    g_return_if_fail (storage_set_view != NULL);
    g_return_if_fail (E_IS_STORAGE_SET_VIEW (storage_set_view));
    g_return_if_fail (path == NULL || g_path_is_absolute (path));

    priv = storage_set_view->priv;

    if (path == NULL) {
        gtk_clist_unselect_all (GTK_CLIST (storage_set_view));
        return;
    }

    node = g_hash_table_lookup (priv->path_to_ctree_node, path);
    if (node == NULL) {
        gtk_clist_unselect_all (GTK_CLIST (storage_set_view));
        return;
    }

    gtk_ctree_select (GTK_CTREE (storage_set_view), node);

    gtk_signal_emit (GTK_OBJECT (storage_set_view), signals[FOLDER_SELECTED], path);
}


E_MAKE_TYPE (e_storage_set_view, "EStorageSetView", EStorageSetView, class_init, init, PARENT_TYPE)