2 Copyright (C) 2009 Paul Davis
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 #include "gtkmm2ext/cairo_widget.h"
21 #include "gtkmm2ext/gui_thread.h"
23 static const char* has_cairo_widget_background_info = "has_cairo_widget_background_info";
25 CairoWidget::CairoWidget ()
26 : _active_state (Gtkmm2ext::Off)
27 , _visual_state (Gtkmm2ext::NoVisualState)
33 CairoWidget::~CairoWidget ()
38 CairoWidget::on_expose_event (GdkEventExpose *ev)
40 cairo_t* cr = gdk_cairo_create (get_window ()->gobj());
41 cairo_rectangle (cr, ev->area.x, ev->area.y, ev->area.width, ev->area.height);
44 /* paint expose area the color of the parent window bg
47 Gdk::Color bg (get_parent_bg());
49 cairo_rectangle (cr, ev->area.x, ev->area.y, ev->area.width, ev->area.height);
50 cairo_set_source_rgb (cr, bg.get_red_p(), bg.get_green_p(), bg.get_blue_p());
60 /** Marks the widget as dirty, so that render () will be called on
61 * the next GTK expose event.
65 CairoWidget::set_dirty ()
67 ENSURE_GUI_THREAD (*this, &CairoWidget::set_dirty);
71 /** Handle a size allocation.
72 * @param alloc GTK allocation.
75 CairoWidget::on_size_allocate (Gtk::Allocation& alloc)
77 Gtk::EventBox::on_size_allocate (alloc);
83 CairoWidget::get_parent_bg ()
87 parent = get_parent ();
90 void* p = g_object_get_data (G_OBJECT(parent->gobj()), has_cairo_widget_background_info);
93 Glib::RefPtr<Gtk::Style> style = parent->get_style();
94 return style->get_bg (get_state());
97 if (!parent->get_has_window()) {
98 parent = parent->get_parent();
104 if (parent && parent->get_has_window()) {
105 return parent->get_style ()->get_bg (parent->get_state());
108 return get_style ()->get_bg (get_state());
112 CairoWidget::set_active_state (Gtkmm2ext::ActiveState s)
114 if (_active_state != s) {
121 CairoWidget::set_visual_state (Gtkmm2ext::VisualState s)
123 if (_visual_state != s) {
130 CairoWidget::set_active (bool yn)
132 /* this is an API simplification for buttons
133 that only use the Active and Normal states.
137 set_active_state (Gtkmm2ext::ExplicitActive);
139 unset_active_state ();
144 CairoWidget::on_state_changed (Gtk::StateType)
146 /* this will catch GTK-level state changes from calls like
150 if (get_state() == Gtk::STATE_INSENSITIVE) {
151 set_visual_state (Gtkmm2ext::VisualState (visual_state() | Gtkmm2ext::Insensitive));
153 set_visual_state (Gtkmm2ext::VisualState (visual_state() & ~Gtkmm2ext::Insensitive));
160 CairoWidget::set_draw_background (bool yn)
166 CairoWidget::provide_background_for_cairo_widget (Gtk::Widget& w, const Gdk::Color& bg)
168 /* set up @w to be able to provide bg information to
169 any CairoWidgets that are packed inside it.
172 w.modify_bg (Gtk::STATE_NORMAL, bg);
173 w.modify_bg (Gtk::STATE_INSENSITIVE, bg);
174 w.modify_bg (Gtk::STATE_ACTIVE, bg);
175 w.modify_bg (Gtk::STATE_SELECTED, bg);
177 g_object_set_data (G_OBJECT(w.gobj()), has_cairo_widget_background_info, (void*) 0xfeedface);