Show alert boxes when something's wrong with the printer

4 files changed, 400 insertions, 0 deletions

diff --git a/src/Makefile.am b/src/Makefile.am
index 7b66b1b..d355299 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -30,6 +30,8 @@ indicator_printers_service_SOURCES = \
 	indicator-printers-service.h \
 	indicator-printers-menu.c \
 	indicator-printers-menu.h \
+	indicator-printer-state-notifier.c \
+	indicator-printer-state-notifier.h \
 	$(cups_notifier_sources)
 
 indicator_printers_service_CPPFLAGS = $(SERVICE_CFLAGS)
diff --git a/src/indicator-printer-state-notifier.c b/src/indicator-printer-state-notifier.c
new file mode 100644
index 0000000..751137a
--- /dev/null
+++ b/src/indicator-printer-state-notifier.c
@@ -0,0 +1,333 @@
+
+#include "indicator-printer-state-notifier.h"
+
+#include <gtk/gtk.h>
+#include <cups/cups.h>
+#include <string.h>
+#include <stdarg.h>
+
+#include "cups-notifier.h"
+
+
+#define RESPONSE_SHOW_SYSTEM_SETTINGS 1
+
+
+G_DEFINE_TYPE (IndicatorPrinterStateNotifier, indicator_printer_state_notifier, G_TYPE_OBJECT)
+
+
+struct _IndicatorPrinterStateNotifierPrivate
+{
+    CupsNotifier *cups_notifier;
+
+    /* printer states that were already notified about in this session */
+    GHashTable *notified_printer_states;
+
+    /* state-reason -> user visible string with a %s for printer name */
+    GHashTable *printer_alerts;
+};
+
+
+enum {
+    PROP_0,
+    PROP_CUPS_NOTIFIER,
+    NUM_PROPERTIES
+};
+
+GParamSpec *properties[NUM_PROPERTIES];
+
+
+static void
+g_hash_table_insert_many (GHashTable *hash_table,
+                          gpointer key,
+                          ...)
+{
+    va_list args;
+
+    va_start (args, key);
+    while (key) {
+        gpointer value = va_arg (args, gpointer);
+        g_hash_table_insert (hash_table, key, value);
+        key = va_arg (args, gpointer);
+    }
+    va_end (args);
+}
+
+
+static gboolean
+g_strv_contains (gchar **str_array,
+                 gchar *needle)
+{
+    gchar **str;
+
+    if (!str_array)
+        return FALSE;
+
+    for (str = str_array; *str; str++) {
+        if (!strcmp (*str, needle))
+            return TRUE;
+    }
+
+    return FALSE;
+}
+
+
+/* returns a list of strings that are in a but not in b; does not copy the
+ * strings */
+static GList *
+g_strv_diff (gchar **a,
+             gchar **b)
+{
+    GList *result = NULL;
+    gchar **p;
+
+    if (!a)
+        return NULL;
+
+    for (p = a; *p; p++) {
+        if (!g_strv_contains (b, *p))
+            result = g_list_prepend (result, *p);
+    }
+
+    return g_list_reverse (result);
+}
+
+
+void
+show_alert_box (const gchar *printer,
+                const gchar *reason,
+                int njobs)
+{
+    GtkWidget *dialog;
+    GtkWidget *image;
+    gchar *primary_text;
+    gchar *secondary_text;
+    const gchar *fmt;
+
+    image = gtk_image_new_from_icon_name ("printer", GTK_ICON_SIZE_DIALOG);
+    primary_text = g_strdup_printf (reason, printer);
+
+    if (njobs == 1)
+        fmt = "You have %d job queued to print on this printer.";
+    else
+        fmt = "You have %d jobs queued to print on this printer.";
+    secondary_text = g_strdup_printf (fmt, njobs);
+
+    dialog = g_object_new (GTK_TYPE_MESSAGE_DIALOG,
+                           "title", "Printing Problem",
+                           "icon-name", "printer",
+                           "image", image,
+                           "text", primary_text,
+                           "secondary-text", secondary_text,
+                           "urgency-hint", TRUE,
+                           "focus-on-map", FALSE,
+                           "window-position", GTK_WIN_POS_CENTER,
+                           "skip-taskbar-hint", FALSE,
+                           "deletable", FALSE,
+                           NULL);
+
+    g_free (primary_text);
+    g_free (secondary_text);
+
+    gtk_dialog_add_buttons (GTK_DIALOG (dialog),
+                            "_Settings…", RESPONSE_SHOW_SYSTEM_SETTINGS,
+                            GTK_STOCK_OK, GTK_RESPONSE_OK,
+                            NULL);
+    gtk_dialog_set_default_response (GTK_DIALOG (dialog),
+                                     GTK_RESPONSE_OK);
+    gtk_widget_show_all (dialog);
+
+    gtk_dialog_run (GTK_DIALOG (dialog));
+
+    gtk_widget_destroy (dialog);
+}
+
+
+static void
+on_printer_state_changed (CupsNotifier *object,
+                          const gchar *text,
+                          const gchar *printer_uri,
+                          const gchar *printer,
+                          guint printer_state,
+                          const gchar *printer_state_reasons,
+                          gboolean printer_is_accepting_jobs,
+                          gpointer user_data)
+{
+    IndicatorPrinterStateNotifierPrivate *priv = INDICATOR_PRINTER_STATE_NOTIFIER (user_data)->priv;
+    int njobs;
+    cups_job_t *jobs;
+    gchar **state_reasons, **already_notified;
+    GList *new_state_reasons, *it;
+
+    njobs = cupsGetJobs (&jobs, printer, 1, CUPS_WHICHJOBS_ACTIVE);
+    cupsFreeJobs (njobs, jobs);
+
+    /* don't show any events if the current user does not have jobs queued on
+     * that printer */
+    if (njobs == 0)
+        return;
+
+    state_reasons = g_strsplit (printer_state_reasons, " ", 0);
+    already_notified = g_hash_table_lookup (priv->notified_printer_states,
+                                            printer);
+
+    new_state_reasons = g_strv_diff (state_reasons, already_notified);
+
+    for (it = new_state_reasons; it; it = g_list_next (new_state_reasons)) {
+        const gchar *reason_text = g_hash_table_lookup (priv->printer_alerts,
+                                                        it->data);
+        if (reason_text)
+            show_alert_box (printer, reason_text, njobs);
+    }
+
+    g_list_free (new_state_reasons);
+
+    g_hash_table_replace (priv->notified_printer_states,
+                          g_strdup (printer),
+                          state_reasons);
+}
+
+
+static void
+get_property (GObject    *object,
+              guint       property_id,
+              GValue     *value,
+              GParamSpec *pspec)
+{
+    IndicatorPrinterStateNotifier *self = INDICATOR_PRINTER_STATE_NOTIFIER (object);
+
+    switch (property_id)
+    {
+        case PROP_CUPS_NOTIFIER:
+            g_value_set_object (value,
+                                indicator_printer_state_notifier_get_cups_notifier (self));
+            break;
+
+        default:
+            G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+    }
+}
+
+
+static void
+set_property (GObject      *object,
+              guint         property_id,
+              const GValue *value,
+              GParamSpec   *pspec)
+{
+    IndicatorPrinterStateNotifier *self = INDICATOR_PRINTER_STATE_NOTIFIER (object);
+
+    switch (property_id)
+    {
+        case PROP_CUPS_NOTIFIER:
+            indicator_printer_state_notifier_set_cups_notifier (self,
+                                                                g_value_get_object (value));
+            break;
+
+        default:
+            G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+    }
+}
+
+
+static void
+dispose (GObject *object)
+{
+    IndicatorPrinterStateNotifier *self = INDICATOR_PRINTER_STATE_NOTIFIER (object);
+
+    if (self->priv->notified_printer_states) {
+        g_hash_table_unref (self->priv->notified_printer_states);
+        self->priv->notified_printer_states = NULL;
+    }
+    if (self->priv->printer_alerts) {
+        g_hash_table_unref (self->priv->printer_alerts);
+        self->priv->printer_alerts = NULL;
+    }
+    g_clear_object (&self->priv->cups_notifier);
+
+    G_OBJECT_CLASS (indicator_printer_state_notifier_parent_class)->dispose (object);
+}
+
+
+static void
+finalize (GObject *object)
+{
+    G_OBJECT_CLASS (indicator_printer_state_notifier_parent_class)->finalize (object);
+}
+
+
+static void
+indicator_printer_state_notifier_class_init (IndicatorPrinterStateNotifierClass *klass)
+{
+    GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+    g_type_class_add_private (klass, sizeof (IndicatorPrinterStateNotifierPrivate));
+
+    object_class->get_property = get_property;
+    object_class->set_property = set_property;
+    object_class->dispose = dispose;
+    object_class->finalize = finalize;
+
+    properties[PROP_CUPS_NOTIFIER] = g_param_spec_object ("cups-notifier",
+                                                          "Cups Notifier",
+                                                          "A cups notifier object",
+                                                          CUPS_TYPE_NOTIFIER,
+                                                          G_PARAM_READWRITE);
+
+    g_object_class_install_properties (object_class, NUM_PROPERTIES, properties);
+}
+
+
+static void
+indicator_printer_state_notifier_init (IndicatorPrinterStateNotifier *self)
+{
+    IndicatorPrinterStateNotifierPrivate *priv;
+
+    priv = G_TYPE_INSTANCE_GET_PRIVATE (self,
+                                        INDICATOR_TYPE_PRINTER_STATE_NOTIFIER,
+                                        IndicatorPrinterStateNotifierPrivate);
+    self->priv = priv;
+
+    priv->notified_printer_states = g_hash_table_new_full (g_str_hash,
+                                                           g_str_equal,
+                                                           g_free,
+                                                           (GDestroyNotify)g_strfreev);
+
+    priv->printer_alerts = g_hash_table_new (g_str_hash, g_str_equal);
+    g_hash_table_insert_many ( priv->printer_alerts,
+                               "media-low", "The printer “%s” is low on paper.",
+                               "media-empty", "The printer “%s” is out of paper.",
+                               "toner-low", "The printer “%s” is low on toner.",
+                               "toner-empty", "The printer “%s” is out of toner.",
+                               "cover-open", "A cover is open on the printer “%s”.",
+                               "door-open", "A door is open on the printer “%s”.",
+                               "cups-missing-filter", "The printer “%s” can’t be used, because required software is missing.",
+                               "offline", "The printer “%s” is currently off-line.",
+                               NULL);
+}
+
+
+CupsNotifier *
+indicator_printer_state_notifier_get_cups_notifier (IndicatorPrinterStateNotifier *self)
+{
+    return self->priv->cups_notifier;
+}
+
+
+void
+indicator_printer_state_notifier_set_cups_notifier (IndicatorPrinterStateNotifier *self,
+                                                    CupsNotifier *cups_notifier)
+{
+    if (self->priv->cups_notifier) {
+        g_signal_handlers_disconnect_by_func (self->priv->cups_notifier,
+                                              on_printer_state_changed,
+                                              self);
+        g_clear_object (&self->priv->cups_notifier);
+    }
+
+    if (cups_notifier) {
+        self->priv->cups_notifier = g_object_ref (cups_notifier);
+        g_signal_connect (cups_notifier, "printer-state-changed",
+                          G_CALLBACK (on_printer_state_changed), self);
+    }
+}
+
diff --git a/src/indicator-printer-state-notifier.h b/src/indicator-printer-state-notifier.h
new file mode 100644
index 0000000..f7d53b9
--- /dev/null
+++ b/src/indicator-printer-state-notifier.h
@@ -0,0 +1,58 @@
+
+#ifndef INDICATOR_PRINTER_STATE_NOTIFIER_H
+#define INDICATOR_PRINTER_STATE_NOTIFIER_H
+
+#include <glib-object.h>
+#include "cups-notifier.h"
+
+G_BEGIN_DECLS
+
+#define INDICATOR_TYPE_PRINTER_STATE_NOTIFIER indicator_printer_state_notifier_get_type()
+
+#define INDICATOR_PRINTER_STATE_NOTIFIER(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST ((obj), \
+  INDICATOR_TYPE_PRINTER_STATE_NOTIFIER, IndicatorPrinterStateNotifier))
+
+#define INDICATOR_PRINTER_STATE_NOTIFIER_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST ((klass), \
+  INDICATOR_TYPE_PRINTER_STATE_NOTIFIER, IndicatorPrinterStateNotifierClass))
+
+#define INDICATOR_IS_PRINTER_STATE_NOTIFIER(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE ((obj), \
+  INDICATOR_TYPE_PRINTER_STATE_NOTIFIER))
+
+#define INDICATOR_IS_PRINTER_STATE_NOTIFIER_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE ((klass), \
+  INDICATOR_TYPE_PRINTER_STATE_NOTIFIER))
+
+#define INDICATOR_PRINTER_STATE_NOTIFIER_GET_CLASS(obj) \
+  (G_TYPE_INSTANCE_GET_CLASS ((obj), \
+  INDICATOR_TYPE_PRINTER_STATE_NOTIFIER, IndicatorPrinterStateNotifierClass))
+
+typedef struct _IndicatorPrinterStateNotifier IndicatorPrinterStateNotifier;
+typedef struct _IndicatorPrinterStateNotifierClass IndicatorPrinterStateNotifierClass;
+typedef struct _IndicatorPrinterStateNotifierPrivate IndicatorPrinterStateNotifierPrivate;
+
+struct _IndicatorPrinterStateNotifier
+{
+  GObject parent;
+
+  IndicatorPrinterStateNotifierPrivate *priv;
+};
+
+struct _IndicatorPrinterStateNotifierClass
+{
+  GObjectClass parent_class;
+};
+
+GType indicator_printer_state_notifier_get_type (void) G_GNUC_CONST;
+
+CupsNotifier * indicator_printer_state_notifier_get_cups_notifier (IndicatorPrinterStateNotifier *self);
+void indicator_printer_state_notifier_set_cups_notifier (IndicatorPrinterStateNotifier *self,
+                                                         CupsNotifier *cups_notifier);
+
+
+G_END_DECLS
+
+#endif
+
diff --git a/src/indicator-printers-service.c b/src/indicator-printers-service.c
index ce89dd0..58644ab 100644
--- a/src/indicator-printers-service.c
+++ b/src/indicator-printers-service.c
@@ -23,6 +23,7 @@
 
 #include "cups-notifier.h"
 #include "indicator-printers-menu.h"
+#include "indicator-printer-state-notifier.h"
 
 
 static void
@@ -39,6 +40,7 @@ int main (int argc, char *argv[])
     DbusmenuServer *menuserver;
     CupsNotifier *cups_notifier;
     IndicatorPrintersMenu *menu;
+    IndicatorPrinterStateNotifier *state_notifier;
     GError *error = NULL;
 
     gtk_init (&argc, &argv);
@@ -71,10 +73,15 @@ int main (int argc, char *argv[])
     dbusmenu_server_set_root (menuserver,
                               indicator_printers_menu_get_root (menu));
 
+    state_notifier = g_object_new (INDICATOR_TYPE_PRINTER_STATE_NOTIFIER,
+                                   "cups-notifier", cups_notifier,
+                                   NULL);
+
     gtk_main ();
 
     g_object_unref (menu);
     g_object_unref (menuserver);
+    g_object_unref (state_notifier);
     g_object_unref (cups_notifier);
     g_object_unref (service);
     return 0;