[mutter] core: Add meta_close_dialog_is_visible() property

[Carlos Garnacho <carlosg src gnome org>]

commit aa47374d0e39550908cf3e1c815bef4a535bf786
Author: Carlos Garnacho <carlosg gnome org>
Date:   Fri Jul 14 16:42:58 2017 +0200

    core: Add meta_close_dialog_is_visible() property
    
    Since the last show/hide call should be effective, implement
    it without requiring an extra interface property.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=762083

 src/core/meta-close-dialog.c |   20 ++++++++++++++++++++
 src/meta/meta-close-dialog.h |    1 +
 2 files changed, 21 insertions(+), 0 deletions(-)
---
diff --git a/src/core/meta-close-dialog.c b/src/core/meta-close-dialog.c
index 9bb708f..bdec804 100644
--- a/src/core/meta-close-dialog.c
+++ b/src/core/meta-close-dialog.c
@@ -31,6 +31,8 @@ enum {
 
 guint dialog_signals[N_SIGNALS] = { 0 };
 
+static GQuark quark_visible = 0;
+
 G_DEFINE_INTERFACE (MetaCloseDialog, meta_close_dialog, G_TYPE_OBJECT)
 
 static void
@@ -50,6 +52,8 @@ meta_close_dialog_default_init (MetaCloseDialogInterface *iface)
                   0,
                   NULL, NULL, NULL,
                   G_TYPE_NONE, 1, META_TYPE_CLOSE_DIALOG_RESPONSE);
+
+  quark_visible = g_quark_from_static_string ("meta-close-dialog-visible");
 }
 
 /**
@@ -67,6 +71,7 @@ meta_close_dialog_show (MetaCloseDialog *dialog)
 
   iface = META_CLOSE_DIALOG_GET_IFACE (dialog);
   iface->show (dialog);
+  g_object_set_qdata (G_OBJECT (dialog), quark_visible, GINT_TO_POINTER (TRUE));
 }
 
 /**
@@ -84,6 +89,7 @@ meta_close_dialog_hide (MetaCloseDialog *dialog)
 
   iface = META_CLOSE_DIALOG_GET_IFACE (dialog);
   iface->hide (dialog);
+  g_object_steal_qdata (G_OBJECT (dialog), quark_visible);
 }
 
 /**
@@ -101,3 +107,17 @@ meta_close_dialog_response (MetaCloseDialog         *dialog,
   g_signal_emit (dialog, dialog_signals[RESPONSE], 0, response);
   meta_close_dialog_hide (dialog);
 }
+
+/**
+ * meta_close_dialog_is_visible:
+ * @dialog: a #MetaCloseDialog
+ *
+ * Returns whether @dialog is currently visible.
+ *
+ * Returns: #TRUE if @dialog is visible.
+ **/
+gboolean
+meta_close_dialog_is_visible (MetaCloseDialog *dialog)
+{
+  return GPOINTER_TO_INT (g_object_get_qdata (G_OBJECT (dialog), quark_visible));
+}
diff --git a/src/meta/meta-close-dialog.h b/src/meta/meta-close-dialog.h
index d9a5fa5..77d2252 100644
--- a/src/meta/meta-close-dialog.h
+++ b/src/meta/meta-close-dialog.h
@@ -46,6 +46,7 @@ struct _MetaCloseDialogInterface
 
 void              meta_close_dialog_show (MetaCloseDialog *dialog);
 void              meta_close_dialog_hide (MetaCloseDialog *dialog);
+gboolean          meta_close_dialog_is_visible (MetaCloseDialog *dialog);
 
 void              meta_close_dialog_response (MetaCloseDialog         *dialog,
                                               MetaCloseDialogResponse  response);