1 files changed, 56 insertions, 0 deletions

diff --git a/tools/perf/ui/gtk/helpline.c b/tools/perf/ui/gtk/helpline.c
new file mode 100644
index 000000000000..5db4432ff12a
--- /dev/null
+++ b/tools/perf/ui/gtk/helpline.c
@@ -0,0 +1,56 @@
+#include <stdio.h>
+#include <string.h>
+
+#include "gtk.h"
+#include "../ui.h"
+#include "../helpline.h"
+#include "../../util/debug.h"
+
+static void gtk_helpline_pop(void)
+{
+        if (!perf_gtk__is_active_context(pgctx))
+                return;
+
+        gtk_statusbar_pop(GTK_STATUSBAR(pgctx->statbar),
+                          pgctx->statbar_ctx_id);
+}
+
+static void gtk_helpline_push(const char *msg)
+{
+        if (!perf_gtk__is_active_context(pgctx))
+                return;
+
+        gtk_statusbar_push(GTK_STATUSBAR(pgctx->statbar),
+                           pgctx->statbar_ctx_id, msg);
+}
+
+static struct ui_helpline gtk_helpline_fns = {
+        .pop    = gtk_helpline_pop,
+        .push   = gtk_helpline_push,
+};
+
+void perf_gtk__init_helpline(void)
+{
+        helpline_fns = &gtk_helpline_fns;
+}
+
+int perf_gtk__show_helpline(const char *fmt, va_list ap)
+{
+        int ret;
+        char *ptr;
+        static int backlog;
+
+        ret = vscnprintf(ui_helpline__current + backlog,
+                         sizeof(ui_helpline__current) - backlog, fmt, ap);
+        backlog += ret;
+
+        /* only first line can be displayed */
+        ptr = strchr(ui_helpline__current, '\n');
+        if (ptr && (ptr - ui_helpline__current) <= backlog) {
+                *ptr = '\0';
+                ui_helpline__puts(ui_helpline__current);
+                backlog = 0;
+        }
+
+        return ret;
+}