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;
29 static void noop() { }
30 sigc::slot<void> CairoWidget::focus_handler (sigc::ptr_fun (noop));
32 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 (?)
34 float r = col.get_red_p ();
35 float g = col.get_green_p ();
36 float b = col.get_blue_p ();
38 cairo_set_source_rgba(cr, r, g, b, a);
41 CairoWidget::CairoWidget ()
42 : _active_state (Gtkmm2ext::Off)
43 , _visual_state (Gtkmm2ext::NoVisualState)
46 , _name_proxy (this, X_("name"))
49 _name_proxy.connect (sigc::mem_fun (*this, &CairoWidget::on_name_changed));
52 CairoWidget::~CairoWidget ()
54 if (_parent_style_change) _parent_style_change.disconnect();
58 CairoWidget::on_button_press_event (GdkEventButton*)
65 CairoWidget::on_expose_event (GdkEventExpose *ev)
67 #ifdef USE_CAIRO_IMAGE_SURFACE
70 image_surface = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, get_width(), get_height());
73 Cairo::RefPtr<Cairo::Context> cr = Cairo::Context::create (image_surface);
75 Cairo::RefPtr<Cairo::Context> cr = get_window()->create_cairo_context ();
78 cr->rectangle (ev->area.x, ev->area.y, ev->area.width, ev->area.height);
81 /* paint expose area the color of the parent window bg
84 Gdk::Color bg (get_parent_bg());
86 cr->set_source_rgb (bg.get_red_p(), bg.get_green_p(), bg.get_blue_p());
89 cairo_rectangle_t expose_area;
90 expose_area.x = ev->area.x;
91 expose_area.y = ev->area.y;
92 expose_area.width = ev->area.width;
93 expose_area.height = ev->area.height;
95 render (cr->cobj(), &expose_area);
97 #ifdef USE_CAIRO_IMAGE_SURFACE
98 image_surface->flush();
99 /* now blit our private surface back to the GDK one */
101 Cairo::RefPtr<Cairo::Context> cairo_context = get_window()->create_cairo_context ();
103 cairo_context->rectangle (ev->area.x, ev->area.y, ev->area.width, ev->area.height);
104 cairo_context->clip ();
105 cairo_context->set_source (image_surface, 0, 0);
106 cairo_context->set_operator (Cairo::OPERATOR_SOURCE);
107 cairo_context->paint ();
113 /** Marks the widget as dirty, so that render () will be called on
114 * the next GTK expose event.
118 CairoWidget::set_dirty ()
120 ENSURE_GUI_THREAD (*this, &CairoWidget::set_dirty);
124 /** Handle a size allocation.
125 * @param alloc GTK allocation.
128 CairoWidget::on_size_allocate (Gtk::Allocation& alloc)
130 Gtk::EventBox::on_size_allocate (alloc);
132 #ifdef USE_CAIRO_IMAGE_SURFACE
133 image_surface = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, alloc.get_width(), alloc.get_height());
140 CairoWidget::get_parent_bg ()
144 parent = get_parent ();
147 void* p = g_object_get_data (G_OBJECT(parent->gobj()), has_cairo_widget_background_info);
150 Glib::RefPtr<Gtk::Style> style = parent->get_style();
151 if (_current_parent != parent) {
152 if (_parent_style_change) _parent_style_change.disconnect();
153 _current_parent = parent;
154 _parent_style_change = parent->signal_style_changed().connect (mem_fun (*this, &CairoWidget::on_style_changed));
156 return style->get_bg (get_state());
159 if (!parent->get_has_window()) {
160 parent = parent->get_parent();
166 if (parent && parent->get_has_window()) {
167 if (_current_parent != parent) {
168 if (_parent_style_change) _parent_style_change.disconnect();
169 _current_parent = parent;
170 _parent_style_change = parent->signal_style_changed().connect (mem_fun (*this, &CairoWidget::on_style_changed));
172 return parent->get_style ()->get_bg (parent->get_state());
175 return get_style ()->get_bg (get_state());
179 CairoWidget::set_active_state (Gtkmm2ext::ActiveState s)
181 if (_active_state != s) {
188 CairoWidget::set_visual_state (Gtkmm2ext::VisualState s)
190 if (_visual_state != s) {
197 CairoWidget::set_active (bool yn)
199 /* this is an API simplification for buttons
200 that only use the Active and Normal states.
204 set_active_state (Gtkmm2ext::ExplicitActive);
206 unset_active_state ();
211 CairoWidget::on_style_changed (const Glib::RefPtr<Gtk::Style>&)
217 CairoWidget::on_state_changed (Gtk::StateType)
219 /* this will catch GTK-level state changes from calls like
223 if (get_state() == Gtk::STATE_INSENSITIVE) {
224 set_visual_state (Gtkmm2ext::VisualState (visual_state() | Gtkmm2ext::Insensitive));
226 set_visual_state (Gtkmm2ext::VisualState (visual_state() & ~Gtkmm2ext::Insensitive));
233 CairoWidget::set_draw_background (bool yn)
239 CairoWidget::provide_background_for_cairo_widget (Gtk::Widget& w, const Gdk::Color& bg)
241 /* set up @w to be able to provide bg information to
242 any CairoWidgets that are packed inside it.
245 w.modify_bg (Gtk::STATE_NORMAL, bg);
246 w.modify_bg (Gtk::STATE_INSENSITIVE, bg);
247 w.modify_bg (Gtk::STATE_ACTIVE, bg);
248 w.modify_bg (Gtk::STATE_SELECTED, bg);
250 g_object_set_data (G_OBJECT(w.gobj()), has_cairo_widget_background_info, (void*) 0xfeedface);
254 CairoWidget::set_flat_buttons (bool yn)
260 CairoWidget::set_focus_handler (sigc::slot<void> s)