move CairoWidget into gtkmm2ext, add CairoPacker, made the time info box use CairoPacker, make the info status "bar" use CairoPacker

git-svn-id: svn://localhost/ardour2/branches/3.0@10933 d708f5d6-7413-0410-9779-e7cbd77b26cf

5 files changed, 351 insertions, 0 deletions

diff --git a/libs/gtkmm2ext/cairo_packer.cc b/libs/gtkmm2ext/cairo_packer.cc
new file mode 100644
index 0000000000..70f51281dd
--- /dev/null
+++ b/libs/gtkmm2ext/cairo_packer.cc
@@ -0,0 +1,56 @@
+#include "gtkmm2ext/utils.h"
+#include "gtkmm2ext/cairo_widget.h"
+#include "gtkmm2ext/cairo_packer.h"
+
+void
+CairoPacker::draw_background (Gtk::Widget& w, GdkEventExpose* ev)
+{
+	int x, y;
+	Gtk::Widget* window_parent;
+	Glib::RefPtr<Gdk::Window> win = Gtkmm2ext::window_to_draw_on (w, &window_parent);
+	
+	if (win) {
+		
+		Cairo::RefPtr<Cairo::Context> context = win->create_cairo_context();
+		w.translate_coordinates (*window_parent, 0, 0, x, y);
+		context->set_source_rgba (0.149, 0.149, 0.149, 1.0);
+		Gtkmm2ext::rounded_rectangle (context, x, y, w.get_allocation().get_width(), w.get_allocation().get_height(), 9);
+		context->fill ();
+	}
+}
+
+CairoHPacker::CairoHPacker ()
+{
+	Gdk::Color bg;
+
+	bg.set_red (lrint (0.149 * 65535));
+	bg.set_green (lrint (0.149 * 65535));
+	bg.set_blue (lrint (0.149 * 65535));
+
+	CairoWidget::provide_background_for_cairo_widget (*this, bg);
+}
+
+bool
+CairoHPacker::on_expose_event (GdkEventExpose* ev)
+{
+	draw_background (*this, ev);
+	return HBox::on_expose_event (ev);
+}
+
+CairoVPacker::CairoVPacker ()
+{
+	Gdk::Color bg;
+
+	bg.set_red (lrint (0.149 * 65535));
+	bg.set_green (lrint (0.149 * 65535));
+	bg.set_blue (lrint (0.149 * 65535));
+
+	CairoWidget::provide_background_for_cairo_widget (*this, bg);
+}
+
+bool
+CairoVPacker::on_expose_event (GdkEventExpose* ev)
+{
+	draw_background (*this, ev);
+	return VBox::on_expose_event (ev);
+}
diff --git a/libs/gtkmm2ext/cairo_widget.cc b/libs/gtkmm2ext/cairo_widget.cc
new file mode 100644
index 0000000000..b6717252ab
--- /dev/null
+++ b/libs/gtkmm2ext/cairo_widget.cc
@@ -0,0 +1,178 @@
+/*
+    Copyright (C) 2009 Paul Davis
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#include "gtkmm2ext/cairo_widget.h"
+#include "gtkmm2ext/gui_thread.h"
+
+static const char* has_cairo_widget_background_info = "has_cairo_widget_background_info";
+
+CairoWidget::CairoWidget ()
+	: _active_state (Gtkmm2ext::ActiveState (0))
+	, _visual_state (Gtkmm2ext::VisualState (0))
+	, _need_bg (true)
+{
+
+}
+
+CairoWidget::~CairoWidget ()
+{
+}
+
+bool
+CairoWidget::on_expose_event (GdkEventExpose *ev)
+{
+	cairo_t* cr = gdk_cairo_create (get_window ()->gobj());
+	cairo_rectangle (cr, ev->area.x, ev->area.y, ev->area.width, ev->area.height);
+	cairo_clip (cr);
+
+	/* paint expose area the color of the parent window bg 
+	*/
+	
+	Gdk::Color bg (get_parent_bg());
+	
+	cairo_rectangle (cr, ev->area.x, ev->area.y, ev->area.width, ev->area.height);
+	cairo_set_source_rgb (cr, bg.get_red_p(), bg.get_green_p(), bg.get_blue_p());
+	cairo_fill (cr);
+
+	render (cr);
+
+	cairo_destroy (cr);
+
+	return true;
+}
+
+/** Marks the widget as dirty, so that render () will be called on
+ *  the next GTK expose event.
+ */
+
+void
+CairoWidget::set_dirty ()
+{
+	ENSURE_GUI_THREAD (*this, &CairoWidget::set_dirty);
+	queue_draw ();
+}
+
+/** Handle a size allocation.
+ *  @param alloc GTK allocation.
+ */
+void
+CairoWidget::on_size_allocate (Gtk::Allocation& alloc)
+{
+	Gtk::EventBox::on_size_allocate (alloc);
+
+	set_dirty ();
+}
+
+Gdk::Color
+CairoWidget::get_parent_bg ()
+{
+        Widget* parent;
+
+	parent = get_parent ();
+
+        while (parent) {
+		void* p = g_object_get_data (G_OBJECT(parent->gobj()), has_cairo_widget_background_info);
+
+		if (p) {
+			Glib::RefPtr<Gtk::Style> style = parent->get_style();
+			return style->get_bg (get_state());
+		}
+		
+		if (!parent->get_has_window()) {
+			parent = parent->get_parent();
+		} else {
+			break;
+		}
+        }
+
+        if (parent && parent->get_has_window()) {
+		return parent->get_style ()->get_bg (parent->get_state());
+        } 
+
+	return get_style ()->get_bg (get_state());
+}
+
+void
+CairoWidget::set_active_state (Gtkmm2ext::ActiveState s)
+{
+	if (_active_state != s) {
+		_active_state = s;
+		StateChanged ();
+	}
+}
+
+void
+CairoWidget::set_visual_state (Gtkmm2ext::VisualState s)
+{
+	if (_visual_state != s) {
+		_visual_state = s;
+		StateChanged ();
+	}
+}
+
+void
+CairoWidget::set_active (bool yn)
+{
+	/* this is an API simplification for buttons
+	   that only use the Active and Normal states.
+	*/
+
+	if (yn) {
+		set_active_state (Gtkmm2ext::Active);
+	} else {
+		unset_active_state ();
+	}
+}
+
+void
+CairoWidget::on_state_changed (Gtk::StateType)
+{
+	/* this will catch GTK-level state changes from calls like
+	   ::set_sensitive() 
+	*/
+
+	if (get_state() == Gtk::STATE_INSENSITIVE) {
+		set_visual_state (Gtkmm2ext::VisualState (visual_state() | Gtkmm2ext::Insensitive));
+	} else {
+		set_visual_state (Gtkmm2ext::VisualState (visual_state() & ~Gtkmm2ext::Insensitive));
+	}
+
+	queue_draw ();
+}
+
+void
+CairoWidget::set_draw_background (bool yn)
+{
+	_need_bg = yn;
+}
+
+void
+CairoWidget::provide_background_for_cairo_widget (Gtk::Widget& w, const Gdk::Color& bg)
+{
+	/* set up @w to be able to provide bg information to 
+	   any CairoWidgets that are packed inside it.
+	*/
+
+	w.modify_bg (Gtk::STATE_NORMAL, bg);
+	w.modify_bg (Gtk::STATE_INSENSITIVE, bg);
+	w.modify_bg (Gtk::STATE_ACTIVE, bg);
+	w.modify_bg (Gtk::STATE_SELECTED, bg);
+
+	g_object_set_data (G_OBJECT(w.gobj()), has_cairo_widget_background_info, (void*) 0xfeedface);
+}
diff --git a/libs/gtkmm2ext/gtkmm2ext/cairo_packer.h b/libs/gtkmm2ext/gtkmm2ext/cairo_packer.h
new file mode 100644
index 0000000000..f6d7753570
--- /dev/null
+++ b/libs/gtkmm2ext/gtkmm2ext/cairo_packer.h
@@ -0,0 +1,34 @@
+#ifndef __gtkmm2ext_cairo_packer_h__
+#define __gtkmm2ext_cairo_packer_h__
+
+#include <gtkmm/box.h>
+
+class CairoPacker 
+{
+  public:
+	CairoPacker () {}
+	virtual ~CairoPacker () {}
+
+  protected:
+	virtual void draw_background (Gtk::Widget&, GdkEventExpose*);
+};
+
+class CairoHPacker : public CairoPacker, public Gtk::HBox
+{
+  public:
+	CairoHPacker ();
+	~CairoHPacker() {}
+
+	bool on_expose_event (GdkEventExpose*);
+};
+
+class CairoVPacker : public CairoPacker, public Gtk::VBox
+{
+  public:
+	CairoVPacker ();
+	~CairoVPacker () {}
+
+	bool on_expose_event (GdkEventExpose*);
+};
+
+#endif /* __gtkmm2ext_cairo_packer_h__ */
diff --git a/libs/gtkmm2ext/gtkmm2ext/cairo_widget.h b/libs/gtkmm2ext/gtkmm2ext/cairo_widget.h
new file mode 100644
index 0000000000..e3ef7bafad
--- /dev/null
+++ b/libs/gtkmm2ext/gtkmm2ext/cairo_widget.h
@@ -0,0 +1,81 @@
+/*
+    Copyright (C) 2009 Paul Davis
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#ifndef __gtk2_ardour_cairo_widget_h__
+#define __gtk2_ardour_cairo_widget_h__
+
+#include <gtkmm/eventbox.h>
+#include "gtkmm2ext/widget_state.h"
+
+/** A parent class for widgets that are rendered using Cairo.
+ */
+
+class CairoWidget : public Gtk::EventBox
+{
+public:
+	CairoWidget ();
+	virtual ~CairoWidget ();
+
+	void set_dirty ();
+
+	Gtkmm2ext::ActiveState active_state() const { return _active_state; }
+	Gtkmm2ext::VisualState visual_state() const { return _visual_state; }
+	
+	/* derived widgets can override these two to catch 
+	   changes in active & visual state
+	*/
+	
+	virtual void set_active_state (Gtkmm2ext::ActiveState);
+	virtual void set_visual_state (Gtkmm2ext::VisualState);
+
+	void unset_active_state () { set_active_state (Gtkmm2ext::ActiveState (0)); }
+	void unset_visual_state () { set_visual_state (Gtkmm2ext::VisualState (0)); }
+
+	/* this is an API simplification for widgets
+	   that only use the Active and Normal active states.
+	*/
+	void set_active (bool);
+	bool get_active () { return active_state() != Gtkmm2ext::ActiveState (0); }
+
+	/* widgets can be told to only draw their "foreground, and thus leave
+	   in place whatever background is drawn by their parent. the default
+	   is that the widget will fill its event window with the background
+	   color of the parent container.
+	*/
+
+	void set_draw_background (bool yn);
+
+	sigc::signal<void> StateChanged;
+
+	static void provide_background_for_cairo_widget (Gtk::Widget& w, const Gdk::Color& bg);
+
+protected:
+	/** Render the widget to the given Cairo context */
+	virtual void render (cairo_t *) = 0;
+	virtual bool on_expose_event (GdkEventExpose *);
+	void on_size_allocate (Gtk::Allocation &);
+	void on_state_changed (Gtk::StateType);
+	Gdk::Color get_parent_bg ();
+
+	Gtkmm2ext::ActiveState _active_state;
+	Gtkmm2ext::VisualState _visual_state;
+	bool                   _need_bg;
+};
+
+#endif
diff --git a/libs/gtkmm2ext/wscript b/libs/gtkmm2ext/wscript
index ef2c623dca..1d386ce6ee 100644
--- a/libs/gtkmm2ext/wscript
+++ b/libs/gtkmm2ext/wscript
@@ -28,6 +28,8 @@ gtkmm2ext_sources = [
         'bindable_button.cc',
         'bindings.cc',
         'cairocell.cc',
+        'cairo_packer.cc',
+        'cairo_widget.cc',
         'cell_renderer_color_selector.cc',
         'cell_renderer_pixbuf_multi.cc',
         'cell_renderer_pixbuf_toggle.cc',