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/*
Copyright (C) 2009 Paul Davis
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "gtkmm2ext/cairo_widget.h"
#include "gtkmm2ext/gui_thread.h"
static const char* has_cairo_widget_background_info = "has_cairo_widget_background_info";
CairoWidget::CairoWidget ()
: _active_state (Gtkmm2ext::Off)
, _visual_state (Gtkmm2ext::NoVisualState)
, _need_bg (true)
{
}
CairoWidget::~CairoWidget ()
{
}
bool
CairoWidget::on_expose_event (GdkEventExpose *ev)
{
cairo_t* cr = gdk_cairo_create (get_window ()->gobj());
cairo_rectangle (cr, ev->area.x, ev->area.y, ev->area.width, ev->area.height);
cairo_clip (cr);
/* paint expose area the color of the parent window bg
*/
Gdk::Color bg (get_parent_bg());
cairo_rectangle (cr, ev->area.x, ev->area.y, ev->area.width, ev->area.height);
cairo_set_source_rgb (cr, bg.get_red_p(), bg.get_green_p(), bg.get_blue_p());
cairo_fill (cr);
render (cr);
cairo_destroy (cr);
return true;
}
/** Marks the widget as dirty, so that render () will be called on
* the next GTK expose event.
*/
void
CairoWidget::set_dirty ()
{
ENSURE_GUI_THREAD (*this, &CairoWidget::set_dirty);
queue_draw ();
}
/** Handle a size allocation.
* @param alloc GTK allocation.
*/
void
CairoWidget::on_size_allocate (Gtk::Allocation& alloc)
{
Gtk::EventBox::on_size_allocate (alloc);
set_dirty ();
}
Gdk::Color
CairoWidget::get_parent_bg ()
{
Widget* parent;
parent = get_parent ();
while (parent) {
void* p = g_object_get_data (G_OBJECT(parent->gobj()), has_cairo_widget_background_info);
if (p) {
Glib::RefPtr<Gtk::Style> style = parent->get_style();
return style->get_bg (get_state());
}
if (!parent->get_has_window()) {
parent = parent->get_parent();
} else {
break;
}
}
if (parent && parent->get_has_window()) {
return parent->get_style ()->get_bg (parent->get_state());
}
return get_style ()->get_bg (get_state());
}
void
CairoWidget::set_active_state (Gtkmm2ext::ActiveState s)
{
if (_active_state != s) {
_active_state = s;
StateChanged ();
}
}
void
CairoWidget::set_visual_state (Gtkmm2ext::VisualState s)
{
if (_visual_state != s) {
_visual_state = s;
StateChanged ();
}
}
void
CairoWidget::set_active (bool yn)
{
/* this is an API simplification for buttons
that only use the Active and Normal states.
*/
if (yn) {
set_active_state (Gtkmm2ext::ExplicitActive);
} else {
unset_active_state ();
}
}
void
CairoWidget::on_state_changed (Gtk::StateType)
{
/* this will catch GTK-level state changes from calls like
::set_sensitive()
*/
if (get_state() == Gtk::STATE_INSENSITIVE) {
set_visual_state (Gtkmm2ext::VisualState (visual_state() | Gtkmm2ext::Insensitive));
} else {
set_visual_state (Gtkmm2ext::VisualState (visual_state() & ~Gtkmm2ext::Insensitive));
}
queue_draw ();
}
void
CairoWidget::set_draw_background (bool yn)
{
_need_bg = yn;
}
void
CairoWidget::provide_background_for_cairo_widget (Gtk::Widget& w, const Gdk::Color& bg)
{
/* set up @w to be able to provide bg information to
any CairoWidgets that are packed inside it.
*/
w.modify_bg (Gtk::STATE_NORMAL, bg);
w.modify_bg (Gtk::STATE_INSENSITIVE, bg);
w.modify_bg (Gtk::STATE_ACTIVE, bg);
w.modify_bg (Gtk::STATE_SELECTED, bg);
g_object_set_data (G_OBJECT(w.gobj()), has_cairo_widget_background_info, (void*) 0xfeedface);
}
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