From 29f60441801d3dbef9d2f4fc0db04a9f883261c2 Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Sat, 15 Oct 2016 23:16:09 +0200
Subject: [PATCH] Mixer strip list: click to move strip into view

---
 gtk2_ardour/mixer_ui.cc | 48 +++++++++++++++++++++++++++++++++++++++++
 gtk2_ardour/mixer_ui.h  |  2 ++
 2 files changed, 50 insertions(+)

diff --git a/gtk2_ardour/mixer_ui.cc b/gtk2_ardour/mixer_ui.cc
index 978e6500e2..de530340a2 100644
--- a/gtk2_ardour/mixer_ui.cc
+++ b/gtk2_ardour/mixer_ui.cc
@@ -1480,10 +1480,58 @@ Mixer_UI::track_display_button_press (GdkEventButton* ev)
 		show_track_list_menu ();
 		return true;
 	}
+	if ((ev->type == GDK_BUTTON_PRESS) && (ev->button == 1)) {
+		TreeModel::Path path;
+		TreeViewColumn* column;
+		int cellx, celly;
+		if (track_display.get_path_at_pos ((int)ev->x, (int)ev->y, path, column, cellx, celly)) {
+			TreeIter iter = track_model->get_iter (path);
+			if ((*iter)[stripable_columns.visible]) {
+				boost::shared_ptr<ARDOUR::Stripable> s = (*iter)[stripable_columns.stripable];
+				move_stripable_into_view (s);
+			}
+		}
+	}
 
 	return false;
 }
 
+void
+Mixer_UI::move_stripable_into_view (boost::shared_ptr<ARDOUR::Stripable> s)
+{
+	if (!scroller.get_hscrollbar()) {
+		return;
+	}
+	bool found = false;
+	int x0 = 0;
+	int x1 = 0;
+	for (list<MixerStrip *>::const_iterator i = strips.begin(); i != strips.end(); ++i) {
+		if ((*i)->route() == s) {
+			int y;
+			found = true;
+			(*i)->translate_coordinates (strip_packer, 0, 0, x0, y);
+			x1 = x0 + (*i)->get_width ();
+			break;
+		}
+	}
+	if (!found) {
+		return;
+	}
+
+	Adjustment* adj = scroller.get_hscrollbar()->get_adjustment();
+	int sl = adj->get_value();
+	int sr = sl + scroller.get_width();
+
+	if (x0 < sl) {
+		scroller.get_hscrollbar()->set_value (max (adj->get_lower(), min (adj->get_upper(), x0 - 1.0)));
+	}
+	else if (x1 > sr) {
+		// TODO: align left side of left most track, if possible
+		double re = x1 - scroller.get_width();
+		scroller.get_hscrollbar()->set_value (max (adj->get_lower(), min (adj->get_upper(), re)));
+	}
+}
+
 void
 Mixer_UI::build_track_menu ()
 {
diff --git a/gtk2_ardour/mixer_ui.h b/gtk2_ardour/mixer_ui.h
index a85006af5a..fb0ba57496 100644
--- a/gtk2_ardour/mixer_ui.h
+++ b/gtk2_ardour/mixer_ui.h
@@ -176,6 +176,8 @@ class Mixer_UI : public Gtkmm2ext::Tabbable, public PBD::ScopedConnectionList, p
 	void scroll_right ();
         void toggle_midi_input_active (bool flip_others);
 
+	void move_stripable_into_view (boost::shared_ptr<ARDOUR::Stripable>);
+
 	void add_stripables (ARDOUR::StripableList&);
 
 	void add_routes (ARDOUR::RouteList&);