bd4d670845
git-svn-id: svn://localhost/ardour2/branches/3.0@10826 d708f5d6-7413-0410-9779-e7cbd77b26cf
82 lines
2.5 KiB
C++
82 lines
2.5 KiB
C++
/*
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Copyright (C) 2009 Paul Davis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef __gtk2_ardour_cairo_widget_h__
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#define __gtk2_ardour_cairo_widget_h__
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#include <gtkmm/eventbox.h>
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#include "gtkmm2ext/widget_state.h"
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/** A parent class for widgets that are rendered using Cairo.
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*/
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class CairoWidget : public Gtk::EventBox
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{
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public:
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CairoWidget ();
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virtual ~CairoWidget ();
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void set_dirty ();
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Gtkmm2ext::ActiveState active_state() const { return _active_state; }
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Gtkmm2ext::VisualState visual_state() const { return _visual_state; }
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/* derived widgets can override these two to catch
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changes in active & visual state
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*/
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virtual void set_active_state (Gtkmm2ext::ActiveState);
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virtual void set_visual_state (Gtkmm2ext::VisualState);
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void unset_active_state () { set_active_state (Gtkmm2ext::ActiveState (0)); }
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void unset_visual_state () { set_visual_state (Gtkmm2ext::VisualState (0)); }
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/* this is an API simplification for widgets
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that only use the Active and Normal active states.
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*/
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void set_active (bool);
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bool get_active () { return active_state() != Gtkmm2ext::ActiveState (0); }
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/* widgets can be told to only draw their "foreground, and thus leave
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in place whatever background is drawn by their parent. the default
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is that the widget will fill its event window with the background
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color of the parent container.
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*/
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void set_draw_background (bool yn);
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sigc::signal<void> StateChanged;
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static void provide_background_for_cairo_widget (Gtk::Widget& w, const Gdk::Color& bg);
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protected:
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/** Render the widget to the given Cairo context */
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virtual void render (cairo_t *) = 0;
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virtual bool on_expose_event (GdkEventExpose *);
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void on_size_allocate (Gtk::Allocation &);
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void on_state_changed (Gtk::StateType);
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Gdk::Color get_parent_bg ();
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Gtkmm2ext::ActiveState _active_state;
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Gtkmm2ext::VisualState _visual_state;
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bool _need_bg;
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};
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#endif
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