[PATCH 6/7] perf ui/gtk: Add GTK info_bar widget to browser window

[Namhyung Kim <namhyung@gmail.com>]

The GtkInfoBar is a modern UI component to display messages
without bothering the main window. It'll be used for showing
a warning message.

As the GtkInfoBar requires 2.18 (or newer) version of GTK+
library, add availability check to Makefile too.

Suggested-by: Sunjin Yang <fan4326@gmail.com>
Signed-off-by: Namhyung Kim <namhyung@gmail.com>
---
 tools/perf/Makefile                 |    3 +++
 tools/perf/config/feature-tests.mak |   13 +++++++++++++
 tools/perf/ui/gtk/browser.c         |   33 +++++++++++++++++++++++++++++++++
 tools/perf/ui/gtk/gtk.h             |   12 ++++++++++++
 4 files changed, 61 insertions(+)

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 7034b3c70d42..14baf7b22647 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -523,6 +523,9 @@ else
 		msg := $(warning GTK2 not found, disables GTK2 support. Please install gtk2-devel or libgtk2.0-dev);
 		BASIC_CFLAGS += -DNO_GTK2_SUPPORT
 	else
+		ifeq ($(call try-cc,$(SOURCE_GTK2_INFOBAR),$(FLAGS_GTK2)),y)
+			BASIC_CFLAGS += -DHAVE_GTK_INFO_BAR
+		endif
 		BASIC_CFLAGS += $(shell pkg-config --cflags gtk+-2.0)
 		EXTLIBS += $(shell pkg-config --libs gtk+-2.0)
 		LIB_OBJS += $(OUTPUT)ui/gtk/browser.o
diff --git a/tools/perf/config/feature-tests.mak b/tools/perf/config/feature-tests.mak
index d9084e03ce56..6c18785a6417 100644
--- a/tools/perf/config/feature-tests.mak
+++ b/tools/perf/config/feature-tests.mak
@@ -78,6 +78,19 @@ int main(int argc, char *argv[])
         return 0;
 }
 endef
+
+define SOURCE_GTK2_INFOBAR
+#pragma GCC diagnostic ignored \"-Wstrict-prototypes\"
+#include <gtk/gtk.h>
+#pragma GCC diagnostic error \"-Wstrict-prototypes\"
+
+int main(void)
+{
+	gtk_info_bar_new();
+
+	return 0;
+}
+endef
 endif
 
 ifndef NO_LIBPERL
diff --git a/tools/perf/ui/gtk/browser.c b/tools/perf/ui/gtk/browser.c
index ece360db8658..fd41e8d10337 100644
--- a/tools/perf/ui/gtk/browser.c
+++ b/tools/perf/ui/gtk/browser.c
@@ -122,6 +122,34 @@ static void perf_gtk__show_hists(GtkWidget *window, struct hists *hists)
 	gtk_container_add(GTK_CONTAINER(window), view);
 }
 
+#ifdef HAVE_GTK_INFO_BAR
+static GtkWidget *perf_gtk__setup_info_bar(void)
+{
+	GtkWidget *info_bar;
+	GtkWidget *label;
+	GtkWidget *content_area;
+
+	info_bar = gtk_info_bar_new();
+	gtk_widget_set_no_show_all(info_bar, TRUE);
+
+	label = gtk_label_new("");
+	gtk_widget_show(label);
+
+	content_area = gtk_info_bar_get_content_area(GTK_INFO_BAR(info_bar));
+	gtk_container_add(GTK_CONTAINER(content_area), label);
+
+	gtk_info_bar_add_button(GTK_INFO_BAR(info_bar), GTK_STOCK_OK,
+				GTK_RESPONSE_OK);
+	g_signal_connect(info_bar, "response",
+			 G_CALLBACK(gtk_widget_hide), NULL);
+
+	pgctx->info_bar = info_bar;
+	pgctx->message_label = label;
+
+	return info_bar;
+}
+#endif
+
 static GtkWidget *perf_gtk__setup_statusbar(void)
 {
 	GtkWidget *stbar;
@@ -145,6 +173,7 @@ int perf_evlist__gtk_browse_hists(struct perf_evlist *evlist,
 	struct perf_evsel *pos;
 	GtkWidget *vbox;
 	GtkWidget *notebook;
+	GtkWidget *info_bar;
 	GtkWidget *statbar;
 	GtkWidget *window;
 
@@ -189,6 +218,10 @@ int perf_evlist__gtk_browse_hists(struct perf_evlist *evlist,
 
 	gtk_box_pack_start(GTK_BOX(vbox), notebook, TRUE, TRUE, 0);
 
+	info_bar = perf_gtk__setup_info_bar();
+	if (info_bar)
+		gtk_box_pack_start(GTK_BOX(vbox), info_bar, FALSE, FALSE, 0);
+
 	statbar = perf_gtk__setup_statusbar();
 	gtk_box_pack_start(GTK_BOX(vbox), statbar, FALSE, FALSE, 0);
 
diff --git a/tools/perf/ui/gtk/gtk.h b/tools/perf/ui/gtk/gtk.h
index 206167868c5f..a4d0f2b4a2dc 100644
--- a/tools/perf/ui/gtk/gtk.h
+++ b/tools/perf/ui/gtk/gtk.h
@@ -10,6 +10,11 @@
 
 struct perf_gtk_context {
 	GtkWidget *main_window;
+
+#ifdef HAVE_GTK_INFO_BAR
+	GtkWidget *info_bar;
+	GtkWidget *message_label;
+#endif
 	GtkWidget *statbar;
 	guint statbar_ctx_id;
 };
@@ -24,4 +29,11 @@ static inline bool perf_gtk__is_active_context(struct perf_gtk_context *ctx)
 struct perf_gtk_context *perf_gtk__activate_context(GtkWidget *window);
 int perf_gtk__deactivate_context(struct perf_gtk_context **ctx);
 
+#ifndef HAVE_GTK_INFO_BAR
+static inline GtkWidget *perf_gtk__setup_info_bar(void)
+{
+	return NULL;
+}
+#endif
+
 #endif /* _PERF_GTK_H_ */
-- 
1.7.9.2