static gboolean
nautilus_zoom_control_scroll_event (GtkWidget *widget, GdkEventScroll *event)
{
NautilusZoomControl *zoom_control;
zoom_control = NAUTILUS_ZOOM_CONTROL (widget);
if (event->type != GDK_SCROLL) {
return FALSE;
}
if (event->direction == GDK_SCROLL_DOWN &&
nautilus_zoom_control_can_zoom_out (zoom_control)) {
g_signal_emit (widget, signals[ZOOM_OUT], 0);
} else if (event->direction == GDK_SCROLL_UP &&
nautilus_zoom_control_can_zoom_in (zoom_control)) {
g_signal_emit (widget, signals[ZOOM_IN], 0);
}
/* We don't change our state (to reflect the new zoom) here. The zoomable will
* call back with the new level. Actually, the callback goes to the view-frame
* containing the zoomable which, in turn, emits zoom_level_changed, which
* someone (e.g. nautilus_window) picks up and handles by calling into us -
* nautilus_zoom_control_set_zoom_level.
*/
return TRUE;
}
static void
label_style_set_callback (GtkWidget *label,
GtkStyle *style,
gpointer user_data)
{
set_label_size (NAUTILUS_ZOOM_CONTROL (user_data));
}
static void
zoom_menu_callback (GtkMenuItem *item, gpointer callback_data)
{
NautilusZoomLevel zoom_level;
NautilusZoomControl *zoom_control;
gboolean can_zoom;
zoom_control = NAUTILUS_ZOOM_CONTROL (callback_data);
/* Don't do anything if we're just setting the toggle state of menu items. */
if (zoom_control->details->marking_menu_items) {
return;
}
/* Don't send the signal if the menuitem was toggled off */
if (!gtk_check_menu_item_get_active (GTK_CHECK_MENU_ITEM (item))) {
return;
}
zoom_level = (NautilusZoomLevel) GPOINTER_TO_INT (g_object_get_data (G_OBJECT (item), "zoom_level"));
/* Assume we can zoom and then check whether we're right. */
can_zoom = TRUE;
if (zoom_control->details->has_min_zoom_level &&
zoom_level < zoom_control->details->min_zoom_level)
can_zoom = FALSE; /* no, we're below the minimum zoom level. */
if (zoom_control->details->has_max_zoom_level &&
zoom_level > zoom_control->details->max_zoom_level)
can_zoom = FALSE; /* no, we're beyond the upper zoom level. */
/* if we can zoom */
if (can_zoom) {
g_signal_emit (zoom_control, signals[ZOOM_TO_LEVEL], 0, zoom_level);
}
}
static void
nautilus_zoom_control_finalize (GObject *object)
{
g_list_free (NAUTILUS_ZOOM_CONTROL (object)->details->preferred_zoom_levels);
G_OBJECT_CLASS (nautilus_zoom_control_parent_class)->finalize (object);
}
static void
zoom_changed_callback (NautilusWindow *window,
NautilusZoomLevel zoom_level,
gboolean supports_zooming,
gboolean can_zoom,
gboolean can_zoom_in,
gboolean can_zoom_out,
GtkWidget *zoom_control)
{
if (supports_zooming) {
gtk_widget_set_sensitive (zoom_control, can_zoom);
gtk_widget_show (zoom_control);
if (can_zoom) {
nautilus_zoom_control_set_zoom_level (NAUTILUS_ZOOM_CONTROL (zoom_control),
zoom_level);
}
} else {
gtk_widget_hide (zoom_control);
}
}