From 5ef4f8973f72a9f1832b8a8b2279c296e42b3086 Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Mon, 25 Nov 2024 17:54:05 -0700
Subject: [PATCH] somewhat sort of working clip start drag (GUI edition)

---
 gtk2_ardour/editor_drag.cc     | 37 ++++++++++++++++++++++++++--------
 gtk2_ardour/editor_drag.h      |  7 +++++--
 gtk2_ardour/midi_cue_editor.cc |  8 +++++++-
 gtk2_ardour/midi_cue_editor.h  |  5 +++++
 4 files changed, 46 insertions(+), 11 deletions(-)

diff --git a/gtk2_ardour/editor_drag.cc b/gtk2_ardour/editor_drag.cc
index e14207b750..69012a0b5f 100644
--- a/gtk2_ardour/editor_drag.cc
+++ b/gtk2_ardour/editor_drag.cc
@@ -70,6 +70,7 @@
 #include "gui_thread.h"
 #include "keyboard.h"
 #include "mergeable_line.h"
+#include "midi_cue_editor.h"
 #include "midi_region_view.h"
 #include "midi_selection.h"
 #include "midi_time_axis.h"
@@ -7541,12 +7542,13 @@ VelocityLineDrag::aborted (bool)
 	vd->end_line_drag (false);
 }
 
-ClipStartDrag::ClipStartDrag (EditingContext& ec, ArdourCanvas::Rectangle& r, Temporal::timepos_t const & os)
-	: Drag (ec, &r, os.time_domain(), nullptr, false)
+ClipStartDrag::ClipStartDrag (EditingContext& ec, ArdourCanvas::Rectangle& r, MidiCueEditor& m)
+	: Drag (ec, &r, Temporal::BeatTime, nullptr, false)
+	, mce (m)
 	, dragging_rect (&r)
-	, original_start (os)
+	, original_rect (r.get())
+	, _cumulative_dx (0)
 {
-	std::cerr << "CSD!\n";
 }
 
 ClipStartDrag::~ClipStartDrag ()
@@ -7567,20 +7569,39 @@ ClipStartDrag::end_grab (GdkEvent* ev)
 }
 
 void
-ClipStartDrag::motion (GdkEvent*, bool)
+ClipStartDrag::motion (GdkEvent* event, bool first_move)
 {
-	std::cerr << "clip start drag\n";
+	double dx = current_pointer_x () - last_pointer_x ();
+	_cumulative_dx += dx;
+
+	ArdourCanvas::Rect r (original_rect);
+
+	if (_cumulative_dx > r.x1) {
+		r.x1 = r.x1 + _cumulative_dx;
+	} else {
+		r.x1 = r.x0 + 1.;
+	}
+
+	dragging_rect->set (r);
 }
 
 void
-ClipStartDrag::finished (GdkEvent*, bool)
+ClipStartDrag::finished (GdkEvent* event, bool movement_occured)
 {
-	std::cerr << "clip start drag ALL DONE\n";
+	if (!movement_occured) {
+		dragging_rect->set (original_rect);
+		return;
+	}
+
+	Temporal::Beats b (random() % 12, 0);
+	std::cerr << "set start @ " << b.str() << std::endl;
+	mce.set_trigger_start (timepos_t (b));
 }
 
 void
 ClipStartDrag::aborted (bool)
 {
+	dragging_rect->set (original_rect);
 }
 
 ClipEndDrag::ClipEndDrag (EditingContext& ec, ArdourCanvas::Rectangle& r, Temporal::timepos_t const & oe)
diff --git a/gtk2_ardour/editor_drag.h b/gtk2_ardour/editor_drag.h
index 9775da2389..b35a942055 100644
--- a/gtk2_ardour/editor_drag.h
+++ b/gtk2_ardour/editor_drag.h
@@ -70,6 +70,7 @@ class EditingContext;
 class Editor;
 class EditorCursor;
 class TimeAxisView;
+class MidiCueEditor;
 class MidiTimeAxisView;
 class Drag;
 class NoteBase;
@@ -1643,7 +1644,7 @@ class VelocityLineDrag : public FreehandLineDrag<Evoral::ControlList::OrderedPoi
 class ClipStartDrag : public Drag
 {
   public:
-	ClipStartDrag (EditingContext&, ArdourCanvas::Rectangle &, Temporal::timepos_t const &);
+	ClipStartDrag (EditingContext&, ArdourCanvas::Rectangle &, MidiCueEditor& m);
 	~ClipStartDrag ();
 
 	void start_grab (GdkEvent*,Gdk::Cursor*);
@@ -1653,8 +1654,10 @@ class ClipStartDrag : public Drag
 	void aborted (bool);
 
   private:
+	MidiCueEditor& mce;
 	ArdourCanvas::Rectangle* dragging_rect;
-	Temporal::timepos_t original_start;
+	ArdourCanvas::Rect original_rect;
+	double _cumulative_dx;
 };
 
 class ClipEndDrag : public Drag
diff --git a/gtk2_ardour/midi_cue_editor.cc b/gtk2_ardour/midi_cue_editor.cc
index 07f8518480..ffc5565bcb 100644
--- a/gtk2_ardour/midi_cue_editor.cc
+++ b/gtk2_ardour/midi_cue_editor.cc
@@ -507,6 +507,12 @@ MidiCueEditor::canvas_cue_end_event (GdkEvent* event, ArdourCanvas::Item* item)
 	return typed_event (item, event, ClipEndItem);
 }
 
+void
+MidiCueEditor::set_trigger_start (Temporal::timepos_t const & p)
+{
+	ref.trigger()->the_region()->set_start (p);
+}
+
 Gtk::Widget&
 MidiCueEditor::viewport()
 {
@@ -655,7 +661,7 @@ MidiCueEditor::button_press_handler_1 (ArdourCanvas::Item* item, GdkEvent* event
 	case ClipStartItem: {
 		ArdourCanvas::Rectangle* r = dynamic_cast<ArdourCanvas::Rectangle*> (item);
 		if (r) {
-			_drags->set (new ClipStartDrag (*this, *r, timepos_t (BeatTime)), event);
+			_drags->set (new ClipStartDrag (*this, *r, *this), event);
 		}
 		return true;
 		break;
diff --git a/gtk2_ardour/midi_cue_editor.h b/gtk2_ardour/midi_cue_editor.h
index ea2344b0ba..d52b1cf755 100644
--- a/gtk2_ardour/midi_cue_editor.h
+++ b/gtk2_ardour/midi_cue_editor.h
@@ -113,6 +113,11 @@ class MidiCueEditor : public CueEditor
 
 	void set_visible_channel (int chan);
 
+	void set_trigger_start (Temporal::timepos_t const &);
+	void set_trigger_end (Temporal::timepos_t const &);
+	void set_trigger_length (Temporal::timecnt_t const &);
+	void set_trigger_bounds (Temporal::timepos_t const &, Temporal::timepos_t const &);
+
   protected:
 	void register_actions ();