Add a widget giving an overview of the editor, as (what I think is being) suggested in #2714. Many caveats: most notably that it looks quite ugly and you can't (yet) turn it off.

git-svn-id: svn://localhost/ardour2/branches/3.0@5162 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 220 insertions, 0 deletions

diff --git a/gtk2_ardour/editor_summary.cc b/gtk2_ardour/editor_summary.cc
new file mode 100644
index 0000000000..3b9de030de
--- /dev/null
+++ b/gtk2_ardour/editor_summary.cc
@@ -0,0 +1,220 @@
+#include "ardour/session.h"
+#include "time_axis_view.h"
+#include "streamview.h"
+#include "editor_summary.h"
+#include "gui_thread.h"
+#include "editor.h"
+#include "region_view.h"
+
+using namespace std;
+using namespace sigc;
+using namespace ARDOUR;
+
+EditorSummary::EditorSummary (Editor* e)
+	: _editor (e),
+	  _session (0),
+	  _pixmap (0),
+	  _regions_dirty (true),
+	  _width (512),
+	  _height (64),
+	  _pixels_per_frame (1)
+{
+	
+}
+
+void
+EditorSummary::set_session (Session* s)
+{
+	_session = s;
+
+	Region::RegionPropertyChanged.connect (sigc::hide (mem_fun (*this, &EditorSummary::set_dirty)));
+
+	_session->RegionRemoved.connect (sigc::hide (mem_fun (*this, &EditorSummary::set_dirty)));
+	_session->EndTimeChanged.connect (mem_fun (*this, &EditorSummary::set_dirty));
+	_session->StartTimeChanged.connect (mem_fun (*this, &EditorSummary::set_dirty));
+
+	set_dirty ();
+}
+
+EditorSummary::~EditorSummary ()
+{
+	if (_pixmap) {
+		gdk_pixmap_unref (_pixmap);
+	}
+}
+
+bool
+EditorSummary::on_expose_event (GdkEventExpose* event)
+{
+	Gdk::Rectangle const exposure (
+		event->area.x, event->area.y, event->area.width, event->area.height
+		);
+
+	Gdk::Rectangle r = exposure;
+	Gdk::Rectangle content (0, 0, _width, _height);
+	bool intersects;
+	r.intersect (content, intersects);
+	
+	if (intersects) {
+
+		GdkPixmap* p = get_pixmap (get_window()->gobj ());
+
+		gdk_draw_drawable (
+			get_window()->gobj(),
+			get_style()->get_fg_gc (Gtk::STATE_NORMAL)->gobj(),
+			p,
+ 			r.get_x(),
+ 			r.get_y(),
+ 			r.get_x(),
+ 			r.get_y(),
+ 			r.get_width(),
+ 			r.get_height()
+			);
+	}
+
+	cairo_t* cr = gdk_cairo_create (get_window()->gobj());
+
+	cairo_set_source_rgb (cr, 0, 1, 0);
+	cairo_set_line_width (cr, 2);
+
+	double const s = (_editor->leftmost_position () - _session->current_start_frame ()) * _pixels_per_frame; 
+	cairo_move_to (cr, s, 0);
+	cairo_line_to (cr, s, _height);
+	cairo_stroke (cr);
+
+	double const e = s + _editor->current_page_frames() * _pixels_per_frame;
+	cairo_move_to (cr, e, 0);
+	cairo_line_to (cr, e, _height);
+	cairo_stroke (cr);
+	
+	cairo_destroy (cr);
+	
+	return true;
+}
+
+GdkPixmap *
+EditorSummary::get_pixmap (GdkDrawable* drawable)
+{
+	if (_regions_dirty) {
+
+		if (_pixmap) {
+			gdk_pixmap_unref (_pixmap);
+		}
+		_pixmap = gdk_pixmap_new (drawable, _width, _height, -1);
+
+		cairo_t* cr = gdk_cairo_create (_pixmap);
+		render (cr);
+		cairo_destroy (cr);
+
+		_regions_dirty = false;
+	}
+
+	return _pixmap;
+}
+
+void
+EditorSummary::render (cairo_t* cr)
+{
+	if (_session == 0) {
+		return;
+	}
+
+	cairo_set_source_rgb (cr, 0, 0, 0);
+	cairo_rectangle (cr, 0, 0, _width, _height);
+	cairo_fill (cr);
+
+	int N = 0;
+	
+	for (PublicEditor::TrackViewList::const_iterator i = _editor->track_views.begin(); i != _editor->track_views.end(); ++i) {
+		if ((*i)->view()) {
+			++N;
+		}
+	}
+
+	nframes_t const start = _session->current_start_frame ();
+	_pixels_per_frame = static_cast<double> (_width) / (_session->current_end_frame() - start);
+	double const track_height = static_cast<double> (_height) / N;
+
+	cairo_set_line_width (cr, track_height);
+
+	int n = 0;
+	for (PublicEditor::TrackViewList::const_iterator i = _editor->track_views.begin(); i != _editor->track_views.end(); ++i) {
+		StreamView* s = (*i)->view ();
+		if (s) {
+
+			double const v = ((n % 2) == 0) ? 1 : 0.5;
+			cairo_set_source_rgb (cr, v, v, v);
+
+			s->foreach_regionview (bind (
+						       mem_fun (*this, &EditorSummary::render_region),
+						       cr,
+						       start,
+						       track_height * (n + 0.5)
+						       ));
+			++n;
+		}
+	}
+
+}
+
+void
+EditorSummary::render_region (RegionView* r, cairo_t* cr, nframes_t start, double y) const
+{
+	cairo_move_to (cr, (r->region()->position() - start) * _pixels_per_frame, y);
+	cairo_line_to (cr, (r->region()->position() - start + r->region()->length()) * _pixels_per_frame, y);
+	cairo_stroke (cr);
+}
+
+void
+EditorSummary::set_dirty ()
+{
+	ENSURE_GUI_THREAD (mem_fun (*this, &EditorSummary::set_dirty));
+
+	_regions_dirty = true;
+	queue_draw ();
+}
+
+void
+EditorSummary::set_bounds_dirty ()
+{
+	ENSURE_GUI_THREAD (mem_fun (*this, &EditorSummary::set_bounds_dirty));
+	queue_draw ();
+}
+
+void
+EditorSummary::on_size_request (Gtk::Requisition *req)
+{
+	req->width = 64;
+	req->height = 64;
+}
+
+void
+EditorSummary::on_size_allocate (Gtk::Allocation& alloc)
+{
+	Gtk::EventBox::on_size_allocate (alloc);
+
+	_width = alloc.get_width ();
+	_height = alloc.get_height ();
+
+	set_dirty ();
+}
+
+bool
+EditorSummary::on_button_press_event (GdkEventButton* ev)
+{
+	if (ev->button == 1) {
+
+		nframes_t f = (ev->x / _pixels_per_frame) + _session->current_start_frame();
+
+		nframes_t const h = _editor->current_page_frames () / 2;
+		if (f > h) {
+			f -= h;
+		} else {
+			f = 0;
+		}
+		
+		_editor->reset_x_origin (f);
+	}
+
+	return true;
+}