new class/widget for linking two buttons (widgets, really) together

git-svn-id: svn://localhost/ardour2/branches/3.0@11436 d708f5d6-7413-0410-9779-e7cbd77b26cf

gtk2_ardour/button_joiner.cc

@@ -0,0 +1,162 @@
+#include <iostream>
+#include <algorithm>
+
+#include <gtkmm/toggleaction.h>
+
+#include "gtkmm2ext/utils.h"
+
+#include "ardour_ui.h"
+#include "button_joiner.h"
+
+using namespace Gtk;
+
+ButtonJoiner::ButtonJoiner (Gtk::Widget& l, Gtk::Widget& r)
+	: left (l)
+	, right (r)
+{
+	packer.set_homogeneous (true);
+	packer.pack_start (l);
+	packer.pack_start (r);
+	packer.show ();
+
+	align.add (packer);
+	align.set (0.5, 1.0);
+	align.set_padding (7, 0, 5, 5);
+	align.show ();
+
+	add (align);
+
+	add_events (Gdk::BUTTON_PRESS_MASK|Gdk::BUTTON_RELEASE_MASK|
+		    Gdk::ENTER_NOTIFY_MASK|Gdk::LEAVE_NOTIFY_MASK);
+}
+
+void
+ButtonJoiner::render (cairo_t* cr)
+{
+	double h = get_height();
+	double r, g, b;
+	
+	if (_active_state == Gtkmm2ext::ActiveState (0)) {
+		r = 0.0;
+		g = 0.0;
+		b = 0.0;
+	} else {
+		r = 0.16;
+		g = 0.58;
+		b = 0.757;
+	}
+
+	Gtkmm2ext::rounded_top_rectangle (cr, 0, 0, get_width(), h, 9);
+	cairo_set_source_rgb (cr, r, g, b);
+	cairo_fill (cr);
+}
+
+bool
+ButtonJoiner::on_button_release_event (GdkEventButton* ev)
+{
+	if (_action) {
+		_action->activate ();
+	}
+
+	return true;
+}
+
+void
+ButtonJoiner::on_size_request (Gtk::Requisition* r)
+{
+	CairoWidget::on_size_request (r);
+}
+
+void
+ButtonJoiner::set_related_action (Glib::RefPtr<Action> act)
+{
+	Gtkmm2ext::Activatable::set_related_action (act);
+
+	if (_action) {
+
+		action_tooltip_changed ();
+
+		Glib::RefPtr<ToggleAction> tact = Glib::RefPtr<ToggleAction>::cast_dynamic (_action);
+		if (tact) {
+			action_toggled ();
+			tact->signal_toggled().connect (sigc::mem_fun (*this, &ButtonJoiner::action_toggled));
+		} 
+
+		_action->connect_property_changed ("sensitive", sigc::mem_fun (*this, &ButtonJoiner::action_sensitivity_changed));
+		_action->connect_property_changed ("visible", sigc::mem_fun (*this, &ButtonJoiner::action_visibility_changed));
+		_action->connect_property_changed ("tooltip", sigc::mem_fun (*this, &ButtonJoiner::action_tooltip_changed));
+	}
+}
+
+void
+ButtonJoiner::action_sensitivity_changed ()
+{
+	if (_action->property_sensitive ()) {
+		set_visual_state (Gtkmm2ext::VisualState (visual_state() & ~Gtkmm2ext::Insensitive));
+	} else {
+		set_visual_state (Gtkmm2ext::VisualState (visual_state() | Gtkmm2ext::Insensitive));
+	}
+	
+}
+
+void
+ButtonJoiner::action_visibility_changed ()
+{
+	if (_action->property_visible ()) {
+		show ();
+	} else {
+		hide ();
+	}
+}
+
+void
+ButtonJoiner::action_tooltip_changed ()
+{
+	std::string str = _action->property_tooltip().get_value();
+	ARDOUR_UI::instance()->set_tip (*this, str);
+}
+
+void
+ButtonJoiner::action_toggled ()
+{
+	Glib::RefPtr<ToggleAction> tact = Glib::RefPtr<ToggleAction>::cast_dynamic (_action);
+
+	if (tact) {
+		if (tact->get_active()) {
+			set_active_state (Gtkmm2ext::Active);
+		} else {
+			unset_active_state ();
+		}
+	}
+}	
+
+void
+ButtonJoiner::set_active_state (Gtkmm2ext::ActiveState s)
+{
+	bool changed = (_active_state != s);
+	CairoWidget::set_active_state (s);
+	if (changed) {
+		set_colors ();
+	}
+}
+
+void
+ButtonJoiner::set_colors ()
+{
+	double r, g, b;
+
+	if (_active_state == Gtkmm2ext::ActiveState (0)) {
+		r = 0.0;
+		g = 0.0;
+		b = 0.0;
+	} else {
+		r = 0.16;
+		g = 0.58;
+		b = 0.757;
+	}
+
+	Gdk::Color col;
+	col.set_rgb_p (r, g, b);
+	provide_background_for_cairo_widget (*this, col);
+}
+

gtk2_ardour/button_joiner.h

@@ -0,0 +1,36 @@
+#ifndef __gtk2_ardour_button_joiner_h__
+#define __gtk2_ardour_button_joiner_h__
+
+#include <gtkmm/box.h>
+#include <gtkmm/alignment.h>
+#include <gtkmm/action.h>
+
+#include "gtkmm2ext/activatable.h"
+#include "gtkmm2ext/cairo_widget.h"
+
+class ButtonJoiner : public CairoWidget, public Gtkmm2ext::Activatable {
+  public:
+	ButtonJoiner (Gtk::Widget&, Gtk::Widget&);
+	void set_related_action (Glib::RefPtr<Gtk::Action>);	
+	void set_active_state (Gtkmm2ext::ActiveState);
+
+  protected:
+	void render (cairo_t*);
+	bool on_button_release_event (GdkEventButton*);
+	void on_size_request (Gtk::Requisition*);
+
+	void action_sensitivity_changed ();
+	void action_visibility_changed ();
+	void action_tooltip_changed ();
+	void action_toggled ();
+
+  private:
+	Gtk::Widget& left;
+	Gtk::Widget& right;
+	Gtk::HBox    packer;
+	Gtk::Alignment align;
+
+	void set_colors ();
+};
+
+#endif /* __gtk2_ardour_button_joiner_h__ */