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nautilus-floating-bar.c

/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */

/* Nautilus - Floating status bar.
 *
 * Copyright (C) 2011 Red Hat Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * 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.
 *
 * Authors: Cosimo Cecchi <cosimoc@redhat.com>
 *
 */

#include <config.h>

#include "nautilus-floating-bar.h"

00030 struct _NautilusFloatingBarDetails {
      gchar *label;

      GtkWidget *label_widget;
      GtkWidget *spinner;
      gboolean show_spinner;

      guint escaping_distance;
      GtkAllocation initial_allocation;
      GdkRectangle escaping_area;
};

enum {
      PROP_LABEL = 1,
      PROP_SHOW_SPINNER,
      PROP_ESCAPING_DISTANCE,
      NUM_PROPERTIES
};

enum {
      ACTION,
      NUM_SIGNALS
};

#define NAUTILUS_FLOATING_BAR_ESCAPING_DISTANCE 20

static GParamSpec *properties[NUM_PROPERTIES] = { NULL, };
static guint signals[NUM_SIGNALS] = { 0, };

G_DEFINE_TYPE (NautilusFloatingBar, nautilus_floating_bar,
               GTK_TYPE_BOX);

static void
action_button_clicked_cb (GtkButton *button,
                    NautilusFloatingBar *self)
{
      gint action_id;

      action_id = GPOINTER_TO_INT
            (g_object_get_data (G_OBJECT (button), "action-id"));
      
      g_signal_emit (self, signals[ACTION], 0, action_id);
}

static void
nautilus_floating_bar_finalize (GObject *obj)
{
      NautilusFloatingBar *self = NAUTILUS_FLOATING_BAR (obj);

      g_free (self->priv->label);

      G_OBJECT_CLASS (nautilus_floating_bar_parent_class)->finalize (obj);
}

static void
nautilus_floating_bar_get_property (GObject *object,
                            guint property_id,
                            GValue *value,
                            GParamSpec *pspec)
{
      NautilusFloatingBar *self = NAUTILUS_FLOATING_BAR (object);

      switch (property_id) {
      case PROP_LABEL:
            g_value_set_string (value, self->priv->label);
            break;
      case PROP_SHOW_SPINNER:
            g_value_set_boolean (value, self->priv->show_spinner);
            break;
      case PROP_ESCAPING_DISTANCE:
            g_value_set_uint (value, self->priv->escaping_distance);
            break;
      default:
            G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
            break;
      }
}

static void
nautilus_floating_bar_set_property (GObject *object,
                            guint property_id,
                            const GValue *value,
                            GParamSpec *pspec)
{
      NautilusFloatingBar *self = NAUTILUS_FLOATING_BAR (object);

      switch (property_id) {
      case PROP_LABEL:
            nautilus_floating_bar_set_label (self, g_value_get_string (value));
            break;
      case PROP_SHOW_SPINNER:
            nautilus_floating_bar_set_show_spinner (self, g_value_get_boolean (value));
            break;
      case PROP_ESCAPING_DISTANCE:
            self->priv->escaping_distance = g_value_get_uint (value);
            break;
      default:
            G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
            break;
      }
}

static void
update_label (NautilusFloatingBar *self)
{
      gtk_label_set_text (GTK_LABEL (self->priv->label_widget), self->priv->label);
}

static gboolean
overlay_enter_notify_cb (GtkWidget        *parent,
                   GdkEventCrossing *event,
                   gpointer          user_data)
{
      GtkWidget *widget = user_data;

      if (event->window != gtk_widget_get_window (widget)) {
            return FALSE;
      }

      if (gtk_widget_get_halign (widget) == GTK_ALIGN_START) {
            gtk_widget_set_halign (widget, GTK_ALIGN_END);
      } else {
            gtk_widget_set_halign (widget, GTK_ALIGN_START);
      }

      gtk_widget_queue_resize (widget);

      return FALSE;
}

static void
nautilus_floating_bar_parent_set (GtkWidget *widget,
                          GtkWidget *old_parent)
{
      GtkWidget *parent;

      parent = gtk_widget_get_parent (widget);

      if (old_parent != NULL) {
            g_signal_handlers_disconnect_by_func (old_parent,
                                          overlay_enter_notify_cb, widget);
      }

      if (parent != NULL) {
            g_signal_connect (parent, "enter-notify-event",
                          G_CALLBACK (overlay_enter_notify_cb), widget);
      }
}

static void
nautilus_floating_bar_show (GtkWidget *widget)
{
      NautilusFloatingBar *self = NAUTILUS_FLOATING_BAR (widget);

      GTK_WIDGET_CLASS (nautilus_floating_bar_parent_class)->show (widget);

      if (self->priv->show_spinner) {
            gtk_spinner_start (GTK_SPINNER (self->priv->spinner));
      }
}

static void
nautilus_floating_bar_hide (GtkWidget *widget)
{
      NautilusFloatingBar *self = NAUTILUS_FLOATING_BAR (widget);

      GTK_WIDGET_CLASS (nautilus_floating_bar_parent_class)->hide (widget);

      gtk_spinner_stop (GTK_SPINNER (self->priv->spinner));
}

static gboolean
nautilus_floating_bar_draw (GtkWidget *widget,
                      cairo_t *cr)
{
        GtkStyleContext *context;

        context = gtk_widget_get_style_context (widget);

        gtk_style_context_save (context);
        gtk_style_context_set_state (context, gtk_widget_get_state_flags (widget));

        gtk_render_background (context, cr, 0, 0,
                         gtk_widget_get_allocated_width (widget),
                         gtk_widget_get_allocated_height (widget));

        gtk_render_frame (context, cr, 0, 0,
                      gtk_widget_get_allocated_width (widget),
                      gtk_widget_get_allocated_height (widget));

        gtk_style_context_restore (context);

        return GTK_WIDGET_CLASS (nautilus_floating_bar_parent_class)->draw (widget, cr);;
}

static void
nautilus_floating_bar_constructed (GObject *obj)
{
      NautilusFloatingBar *self = NAUTILUS_FLOATING_BAR (obj);
      GtkWidget *w, *box;

      G_OBJECT_CLASS (nautilus_floating_bar_parent_class)->constructed (obj);

      box = GTK_WIDGET (obj);

      w = gtk_spinner_new ();
      gtk_box_pack_start (GTK_BOX (box), w, FALSE, FALSE, 0);
      gtk_widget_set_visible (w, self->priv->show_spinner);
      self->priv->spinner = w;

      gtk_widget_set_size_request (w, 16, 16);
      gtk_widget_set_margin_left (w, 8);

      w = gtk_label_new (NULL);
      gtk_label_set_ellipsize (GTK_LABEL (w), PANGO_ELLIPSIZE_END);
      gtk_box_pack_start (GTK_BOX (box), w, FALSE, FALSE, 0);
      g_object_set (w,
                  "margin-top", 2,
                  "margin-bottom", 2,
                  "margin-left", 12,
                  "margin-right", 12,
                  NULL);
      self->priv->label_widget = w;
      gtk_widget_show (w);
}

static void
nautilus_floating_bar_init (NautilusFloatingBar *self)
{
      self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self, NAUTILUS_TYPE_FLOATING_BAR,
                                      NautilusFloatingBarDetails);
}

static void
nautilus_floating_bar_class_init (NautilusFloatingBarClass *klass)
{
      GObjectClass *oclass = G_OBJECT_CLASS (klass);
      GtkWidgetClass *wclass = GTK_WIDGET_CLASS (klass);

      oclass->constructed = nautilus_floating_bar_constructed;
      oclass->set_property = nautilus_floating_bar_set_property;
      oclass->get_property = nautilus_floating_bar_get_property;
      oclass->finalize = nautilus_floating_bar_finalize;

      wclass->draw = nautilus_floating_bar_draw;
      wclass->show = nautilus_floating_bar_show;
      wclass->hide = nautilus_floating_bar_hide;
      wclass->parent_set = nautilus_floating_bar_parent_set;

      properties[PROP_LABEL] =
            g_param_spec_string ("label",
                             "Bar's label",
                             "Label displayed by the bar",
                             NULL,
                             G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS);
      properties[PROP_SHOW_SPINNER] =
            g_param_spec_boolean ("show-spinner",
                              "Show spinner",
                              "Whether a spinner should be shown in the floating bar",
                              FALSE,
                              G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
      properties[PROP_ESCAPING_DISTANCE] =
            g_param_spec_uint ("escaping-distance",
                           "Escaping distance",
                           "Maximum distance between the mouse pointer and the widget",
                           0,
                           G_MAXUINT,
                           NAUTILUS_FLOATING_BAR_ESCAPING_DISTANCE,
                           G_PARAM_CONSTRUCT_ONLY |
                           G_PARAM_READWRITE |
                           G_PARAM_STATIC_STRINGS);

      signals[ACTION] =
            g_signal_new ("action",
                        G_TYPE_FROM_CLASS (klass),
                        G_SIGNAL_RUN_LAST,
                        0, NULL, NULL,
                        g_cclosure_marshal_VOID__INT,
                        G_TYPE_NONE, 1,
                        G_TYPE_INT);

      g_type_class_add_private (klass, sizeof (NautilusFloatingBarDetails));
      g_object_class_install_properties (oclass, NUM_PROPERTIES, properties);
}

void
nautilus_floating_bar_set_label (NautilusFloatingBar *self,
                         const gchar *label)
{
      if (g_strcmp0 (self->priv->label, label) != 0) {
            g_free (self->priv->label);
            self->priv->label = g_strdup (label);

            g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_LABEL]);

            update_label (self);
      }
}

void
nautilus_floating_bar_set_show_spinner (NautilusFloatingBar *self,
                              gboolean show_spinner)
{
      if (self->priv->show_spinner != show_spinner) {
            self->priv->show_spinner = show_spinner;
            gtk_widget_set_visible (self->priv->spinner,
                              show_spinner);

            g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_SHOW_SPINNER]);
      }
}

GtkWidget *
nautilus_floating_bar_new (const gchar *label,
                     gboolean show_spinner)
{
      return g_object_new (NAUTILUS_TYPE_FLOATING_BAR,
                       "label", label,
                       "show-spinner", show_spinner,
                       "orientation", GTK_ORIENTATION_HORIZONTAL,
                       "spacing", 8,
                       NULL);
}

void
nautilus_floating_bar_add_action (NautilusFloatingBar *self,
                          const gchar *stock_id,
                          gint action_id)
{
      GtkWidget *w, *button;

      w = gtk_image_new_from_stock (stock_id, GTK_ICON_SIZE_MENU);
      gtk_widget_show (w);

      button = gtk_button_new ();
      gtk_button_set_image (GTK_BUTTON (button), w);
      gtk_box_pack_end (GTK_BOX (self), button, FALSE, FALSE, 0);
      gtk_widget_show (button);

      g_object_set_data (G_OBJECT (button), "action-id",
                     GINT_TO_POINTER (action_id));

      g_signal_connect (button, "clicked",
                    G_CALLBACK (action_button_clicked_cb), self);
}

void
nautilus_floating_bar_cleanup_actions (NautilusFloatingBar *self)
{
      GtkWidget *widget;
      GList *children, *l;
      gpointer data;

      children = gtk_container_get_children (GTK_CONTAINER (self));
      l = children;

      while (l != NULL) {
            widget = l->data;
            data = g_object_get_data (G_OBJECT (widget), "action-id");
            l = l->next;

            if (data != NULL) {
                  /* destroy this */
                  gtk_widget_destroy (widget);
            }
      }

      g_list_free (children);
}

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