145 lines
4.6 KiB
C++
145 lines
4.6 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 <cairomm/surface.h>
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#include <gtkmm/eventbox.h>
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#include "gtkmm2ext/visibility.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 LIBGTKMM2EXT_API 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_canvas_widget ();
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/* swizzle Gtk::Widget methods for Canvas::Widget */
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void queue_draw ();
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void queue_resize ();
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int get_width () const;
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int get_height () const;
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void size_allocate (Gtk::Allocation&);
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void set_dirty (cairo_rectangle_t *area = 0);
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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::Off); }
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void unset_visual_state () { set_visual_state (Gtkmm2ext::NoVisualState); }
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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 () const { return active_state() != Gtkmm2ext::Off; }
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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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sigc::signal<bool> QueueDraw;
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sigc::signal<bool> QueueResize;
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static void provide_background_for_cairo_widget (Gtk::Widget& w, const Gdk::Color& bg);
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virtual void render (cairo_t *, cairo_rectangle_t*) = 0;
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static void set_flat_buttons (bool yn);
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static bool flat_buttons() { return _flat_buttons; }
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static void set_widget_prelight (bool yn);
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static bool widget_prelight() { return _widget_prelight; }
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static void set_source_rgb_a( cairo_t* cr, Gdk::Color, float a=1.0 );
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/* set_focus_handler() will cause all button-press events on any
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CairoWidget to invoke this slot/functor/function/method/callback.
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We do this because in general, CairoWidgets do not grab
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keyboard focus, but a button press on them should
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clear focus from any active text entry.
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This is global to all CairoWidgets and derived types.
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However, derived types can override the behaviour by defining their
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own on_button_press_event() handler which returns true under all
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conditions (which will block this handler from being called). If
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they wish to invoke any existing focus handler from their own
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button press handler, they can just use: focus_handler();
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*/
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static void set_focus_handler (sigc::slot<void,Gtk::Widget*>);
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protected:
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/** Render the widget to the given Cairo context */
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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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void on_style_changed (const Glib::RefPtr<Gtk::Style>&);
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bool on_button_press_event (GdkEventButton*);
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Gdk::Color get_parent_bg ();
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/* this is an additional virtual "on_..." method. Glibmm does not
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provide a direct signal for name changes, so this acts as a proxy.
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*/
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virtual void on_name_changed () {};
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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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static bool _flat_buttons;
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static bool _widget_prelight;
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bool _grabbed;
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static sigc::slot<void,Gtk::Widget*> focus_handler;
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private:
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Cairo::RefPtr<Cairo::Surface> image_surface;
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Glib::SignalProxyProperty _name_proxy;
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sigc::connection _parent_style_change;
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Widget * _current_parent;
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bool _canvas_widget;
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Gdk::Rectangle _allocation;
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};
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#endif
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