From 684d45c0ccd12cbb0f18336486a8982eeb8029cf Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Thu, 12 Jun 2014 17:21:41 -0400
Subject: [PATCH] restored track height adjustment using alt-scroll on track
 headers

---
 gtk2_ardour/time_axis_view.cc | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/gtk2_ardour/time_axis_view.cc b/gtk2_ardour/time_axis_view.cc
index 059776bd92..a05b144e56 100644
--- a/gtk2_ardour/time_axis_view.cc
+++ b/gtk2_ardour/time_axis_view.cc
@@ -287,6 +287,36 @@ TimeAxisView::show_at (double y, int& nth, VBox *parent)
 bool
 TimeAxisView::controls_ebox_scroll (GdkEventScroll* ev)
 {
+	switch (ev->direction) {
+	case GDK_SCROLL_UP:
+		if (Keyboard::modifier_state_equals (ev->state, Keyboard::ScrollZoomVerticalModifier)) {
+			/* See Editor::_stepping_axis_view for notes on this hack */
+			Editor& e = dynamic_cast<Editor&> (_editor);
+			if (!e.stepping_axis_view ()) {
+				e.set_stepping_axis_view (this);
+			}
+			e.stepping_axis_view()->step_height (false);
+			return true;
+		} 
+		break;
+
+	case GDK_SCROLL_DOWN:
+		if (Keyboard::modifier_state_equals (ev->state, Keyboard::ScrollZoomVerticalModifier)) {
+			/* See Editor::_stepping_axis_view for notes on this hack */
+			Editor& e = dynamic_cast<Editor&> (_editor);
+			if (!e.stepping_axis_view ()) {
+				e.set_stepping_axis_view (this);
+			}
+			e.stepping_axis_view()->step_height (true);
+			return true;
+		} 
+		break;
+
+	default:
+		/* no handling for left/right, yet */
+		break;
+	}
+
 	/* Just forward to the normal canvas scroll method. The coordinate
 	   systems are different but since the canvas is always larger than the
 	   track headers, and aligned with the trackview area, this will work.