[PATCH 14/16] perf ui browser: Optional horizontal scrolling key binding

[Arnaldo Carvalho de Melo <acme@kernel.org>]

From: Arnaldo Carvalho de Melo <acme@redhat.com>

If the classes derived from ui_browser want to do some sort of
horizontal scrolling, they have just to set ui_browser->columns to
the number of columns available.

Those columns can be the number of characters on the screen, if what is
desired is to scroll character by character, or the number of columns in
a spreadsheet like table.

This is what the hist_browser will do, skipping ui_browser->horiz_scroll
columns when rendering each of its lines.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-q6a22bpmpgcr1awgzrmd4jrs@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/ui/browser.c | 14 ++++++++++++++
 tools/perf/ui/browser.h |  2 +-
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/tools/perf/ui/browser.c b/tools/perf/ui/browser.c
index c6c7e5189214..e9703c0829f1 100644
--- a/tools/perf/ui/browser.c
+++ b/tools/perf/ui/browser.c
@@ -393,6 +393,7 @@ int ui_browser__run(struct ui_browser *browser, int delay_secs)
 
 		if (browser->use_navkeypressed && !browser->navkeypressed) {
 			if (key == K_DOWN || key == K_UP ||
+			    (browser->columns && (key == K_LEFT || key == K_RIGHT)) ||
 			    key == K_PGDN || key == K_PGUP ||
 			    key == K_HOME || key == K_END ||
 			    key == ' ') {
@@ -421,6 +422,18 @@ int ui_browser__run(struct ui_browser *browser, int delay_secs)
 				browser->seek(browser, -1, SEEK_CUR);
 			}
 			break;
+		case K_RIGHT:
+			if (!browser->columns)
+				goto out;
+			if (browser->horiz_scroll < browser->columns - 1)
+				++browser->horiz_scroll;
+			break;
+		case K_LEFT:
+			if (!browser->columns)
+				goto out;
+			if (browser->horiz_scroll != 0)
+				--browser->horiz_scroll;
+			break;
 		case K_PGDN:
 		case ' ':
 			if (browser->top_idx + browser->rows > browser->nr_entries - 1)
@@ -459,6 +472,7 @@ int ui_browser__run(struct ui_browser *browser, int delay_secs)
 			browser->seek(browser, -offset, SEEK_END);
 			break;
 		default:
+		out:
 			return key;
 		}
 	}
diff --git a/tools/perf/ui/browser.h b/tools/perf/ui/browser.h
index f3cef564de02..01781de59532 100644
--- a/tools/perf/ui/browser.h
+++ b/tools/perf/ui/browser.h
@@ -14,7 +14,7 @@
 struct ui_browser {
 	u64	      index, top_idx;
 	void	      *top, *entries;
-	u16	      y, x, width, height, rows;
+	u16	      y, x, width, height, rows, columns, horiz_scroll;
 	int	      current_color;
 	void	      *priv;
 	const char    *title;
-- 
2.1.0