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"
25 static const char* has_cairo_widget_background_info = "has_cairo_widget_background_info";
27 bool CairoWidget::_flat_buttons = false;
28 bool CairoWidget::_widget_prelight = true;
30 static void noop() { }
31 sigc::slot<void> CairoWidget::focus_handler (sigc::ptr_fun (noop));
33 void CairoWidget::set_source_rgb_a( cairo_t* cr, Gdk::Color col, float a) //ToDo: this one and the Canvas version should be in a shared file (?)
35 float r = col.get_red_p ();
36 float g = col.get_green_p ();
37 float b = col.get_blue_p ();
39 cairo_set_source_rgba(cr, r, g, b, a);
42 CairoWidget::CairoWidget ()
43 : _active_state (Gtkmm2ext::Off)
44 , _visual_state (Gtkmm2ext::NoVisualState)
47 , _name_proxy (this, X_("name"))
50 _name_proxy.connect (sigc::mem_fun (*this, &CairoWidget::on_name_changed));
53 CairoWidget::~CairoWidget ()
55 if (_parent_style_change) _parent_style_change.disconnect();
59 CairoWidget::on_button_press_event (GdkEventButton*)
66 CairoWidget::on_expose_event (GdkEventExpose *ev)
68 #ifdef USE_CAIRO_IMAGE_SURFACE
71 image_surface = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, get_width(), get_height());
74 Cairo::RefPtr<Cairo::Context> cr = Cairo::Context::create (image_surface);
76 Cairo::RefPtr<Cairo::Context> cr = get_window()->create_cairo_context ();
79 cr->rectangle (ev->area.x, ev->area.y, ev->area.width, ev->area.height);
82 /* paint expose area the color of the parent window bg
85 Gdk::Color bg (get_parent_bg());
87 cr->set_source_rgb (bg.get_red_p(), bg.get_green_p(), bg.get_blue_p());
90 cairo_rectangle_t expose_area;
91 expose_area.x = ev->area.x;
92 expose_area.y = ev->area.y;
93 expose_area.width = ev->area.width;
94 expose_area.height = ev->area.height;
96 render (cr->cobj(), &expose_area);
98 #ifdef USE_CAIRO_IMAGE_SURFACE
99 image_surface->flush();
100 /* now blit our private surface back to the GDK one */
102 Cairo::RefPtr<Cairo::Context> cairo_context = get_window()->create_cairo_context ();
104 cairo_context->rectangle (ev->area.x, ev->area.y, ev->area.width, ev->area.height);
105 cairo_context->clip ();
106 cairo_context->set_source (image_surface, 0, 0);
107 cairo_context->set_operator (Cairo::OPERATOR_SOURCE);
108 cairo_context->paint ();
114 /** Marks the widget as dirty, so that render () will be called on
115 * the next GTK expose event.
119 CairoWidget::set_dirty ()
121 ENSURE_GUI_THREAD (*this, &CairoWidget::set_dirty);
125 /** Handle a size allocation.
126 * @param alloc GTK allocation.
129 CairoWidget::on_size_allocate (Gtk::Allocation& alloc)
131 Gtk::EventBox::on_size_allocate (alloc);
133 #ifdef USE_CAIRO_IMAGE_SURFACE
134 image_surface = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, alloc.get_width(), alloc.get_height());
141 CairoWidget::get_parent_bg ()
145 parent = get_parent ();
148 void* p = g_object_get_data (G_OBJECT(parent->gobj()), has_cairo_widget_background_info);
151 Glib::RefPtr<Gtk::Style> style = parent->get_style();
152 if (_current_parent != parent) {
153 if (_parent_style_change) _parent_style_change.disconnect();
154 _current_parent = parent;
155 _parent_style_change = parent->signal_style_changed().connect (mem_fun (*this, &CairoWidget::on_style_changed));
157 return style->get_bg (get_state());
160 if (!parent->get_has_window()) {
161 parent = parent->get_parent();
167 if (parent && parent->get_has_window()) {
168 if (_current_parent != parent) {
169 if (_parent_style_change) _parent_style_change.disconnect();
170 _current_parent = parent;
171 _parent_style_change = parent->signal_style_changed().connect (mem_fun (*this, &CairoWidget::on_style_changed));
173 return parent->get_style ()->get_bg (parent->get_state());
176 return get_style ()->get_bg (get_state());
180 CairoWidget::set_active_state (Gtkmm2ext::ActiveState s)
182 if (_active_state != s) {
189 CairoWidget::set_visual_state (Gtkmm2ext::VisualState s)
191 if (_visual_state != s) {
198 CairoWidget::set_active (bool yn)
200 /* this is an API simplification for buttons
201 that only use the Active and Normal states.
205 set_active_state (Gtkmm2ext::ExplicitActive);
207 unset_active_state ();
212 CairoWidget::on_style_changed (const Glib::RefPtr<Gtk::Style>&)
218 CairoWidget::on_state_changed (Gtk::StateType)
220 /* this will catch GTK-level state changes from calls like
224 if (get_state() == Gtk::STATE_INSENSITIVE) {
225 set_visual_state (Gtkmm2ext::VisualState (visual_state() | Gtkmm2ext::Insensitive));
227 set_visual_state (Gtkmm2ext::VisualState (visual_state() & ~Gtkmm2ext::Insensitive));
234 CairoWidget::set_draw_background (bool yn)
240 CairoWidget::provide_background_for_cairo_widget (Gtk::Widget& w, const Gdk::Color& bg)
242 /* set up @w to be able to provide bg information to
243 any CairoWidgets that are packed inside it.
246 w.modify_bg (Gtk::STATE_NORMAL, bg);
247 w.modify_bg (Gtk::STATE_INSENSITIVE, bg);
248 w.modify_bg (Gtk::STATE_ACTIVE, bg);
249 w.modify_bg (Gtk::STATE_SELECTED, bg);
251 g_object_set_data (G_OBJECT(w.gobj()), has_cairo_widget_background_info, (void*) 0xfeedface);
255 CairoWidget::set_flat_buttons (bool yn)
261 CairoWidget::set_widget_prelight (bool yn)
263 _widget_prelight = yn;
267 CairoWidget::set_focus_handler (sigc::slot<void> s)