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livetrax/libs/gtkmm2ext/cairo_widget.cc

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/*
* Copyright (C) 2011-2016 Paul Davis <paul@linuxaudiosystems.com>
* Copyright (C) 2014-2018 Robin Gareus <robin@gareus.org>
* Copyright (C) 2014 Ben Loftis <ben@harrisonconsoles.com>
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "gtkmm2ext/cairo_widget.h"
#include "gtkmm2ext/gui_thread.h"
#include "gtkmm2ext/rgb_macros.h"
#ifdef __APPLE__
#include <gdk/gdk.h>
#include "gtkmm2ext/nsglview.h"
#endif
#include "pbd/i18n.h"
static const char* has_cairo_widget_background_info = "has_cairo_widget_background_info";
sigc::slot<void,Gtk::Widget*> CairoWidget::focus_handler;
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 (?)
{
float r = col.get_red_p ();
float g = col.get_green_p ();
float b = col.get_blue_p ();
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cairo_set_source_rgba(cr, r, g, b, a);
}
CairoWidget::CairoWidget ()
: _active_state (Gtkmm2ext::Off)
, _visual_state (Gtkmm2ext::NoVisualState)
, _need_bg (true)
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, _grabbed (false)
, _name_proxy (this, X_("name"))
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, _current_parent (0)
, _canvas_widget (false)
, _nsglview (0)
, _widget_name ("")
{
_name_proxy.connect (sigc::mem_fun (*this, &CairoWidget::on_widget_name_changed));
#ifdef USE_CAIRO_IMAGE_SURFACE
_use_image_surface = true;
#else
_use_image_surface = NULL != getenv("ARDOUR_IMAGE_SURFACE");
#endif
}
CairoWidget::~CairoWidget ()
{
if (_canvas_widget) {
gtk_widget_set_realized (GTK_WIDGET(gobj()), false);
}
if (_parent_style_change) {
_parent_style_change.disconnect();
}
}
void
CairoWidget::set_canvas_widget ()
{
assert (!_nsglview);
assert (!_canvas_widget);
ensure_style ();
gtk_widget_set_realized (GTK_WIDGET(gobj()), true);
_canvas_widget = true;
_use_image_surface = false;
image_surface.clear ();
}
void
CairoWidget::use_nsglview ()
{
assert (!_nsglview);
assert (!_canvas_widget);
assert (!is_realized());
#ifdef ARDOUR_CANVAS_NSVIEW_TAG // patched gdkquartz.h
_nsglview = Gtkmm2ext::nsglview_create (this);
#endif
}
void
CairoWidget::use_image_surface (bool yn)
{
if (_use_image_surface == yn) {
return;
}
image_surface.clear ();
_use_image_surface = yn;
}
int
CairoWidget::get_width () const
{
if (_canvas_widget) {
return _allocation.get_width ();
}
return Gtk::EventBox::get_width ();
}
int
CairoWidget::get_height () const
{
if (_canvas_widget) {
return _allocation.get_height ();
}
return Gtk::EventBox::get_height ();
}
void
CairoWidget::size_allocate (Gtk::Allocation& alloc)
{
if (_canvas_widget) {
memcpy (&_allocation, &alloc, sizeof(Gtk::Allocation));
return;
}
Gtk::EventBox::size_allocate (alloc);
}
bool
CairoWidget::on_button_press_event (GdkEventButton*)
{
focus_handler (this);
return false;
}
uint32_t
CairoWidget::background_color ()
{
if (_need_bg) {
Gdk::Color bg (get_parent_bg());
return RGBA_TO_UINT (bg.get_red() / 255, bg.get_green() / 255, bg.get_blue() / 255, 255);
} else {
return 0;
}
}
bool
CairoWidget::on_expose_event (GdkEventExpose *ev)
{
#ifdef __APPLE__
if (_nsglview) {
Gtkmm2ext::nsglview_queue_draw (_nsglview, ev->area.x, ev->area.y, ev->area.width, ev->area.height);
return true;
}
#endif
Cairo::RefPtr<Cairo::Context> cr;
if (_use_image_surface) {
if (!image_surface) {
image_surface = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, get_width(), get_height());
}
cr = Cairo::Context::create (image_surface);
} else {
cr = get_window()->create_cairo_context ();
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}
cr->rectangle (ev->area.x, ev->area.y, ev->area.width, ev->area.height);
if (_need_bg) {
cr->clip_preserve ();
/* paint expose area the color of the parent window bg
*/
Gdk::Color bg (get_parent_bg());
cr->set_source_rgb (bg.get_red_p(), bg.get_green_p(), bg.get_blue_p());
cr->fill ();
} else {
std::cerr << get_name() << " skipped bg fill\n";
cr->clip ();
}
cairo_rectangle_t expose_area;
expose_area.x = ev->area.x;
expose_area.y = ev->area.y;
expose_area.width = ev->area.width;
expose_area.height = ev->area.height;
render (cr, &expose_area);
if (_use_image_surface) {
image_surface->flush();
/* now blit our private surface back to the GDK one */
Cairo::RefPtr<Cairo::Context> window_context = get_window()->create_cairo_context ();
window_context->rectangle (ev->area.x, ev->area.y, ev->area.width, ev->area.height);
window_context->clip ();
window_context->set_source (image_surface, 0, 0);
window_context->set_operator (Cairo::OPERATOR_SOURCE);
window_context->paint ();
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}
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return true;
}
/** Marks the widget as dirty, so that render () will be called on
* the next GTK expose event.
*/
void
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CairoWidget::set_dirty (cairo_rectangle_t *area)
{
ENSURE_GUI_THREAD (*this, &CairoWidget::set_dirty);
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if (!area) {
queue_draw ();
} else {
// TODO emit QueueDrawArea -> ArdourCanvas::Widget
if (QueueDraw ()) {
return;
}
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queue_draw_area (area->x, area->y, area->width, area->height);
}
}
void
CairoWidget::queue_draw ()
{
if (QueueDraw ()) {
return;
}
Gtk::EventBox::queue_draw ();
}
void
CairoWidget::queue_resize ()
{
if (QueueResize ()) {
return;
}
Gtk::EventBox::queue_resize ();
}
/** Handle a size allocation.
* @param alloc GTK allocation.
*/
void
CairoWidget::on_size_allocate (Gtk::Allocation& alloc)
{
if (!_canvas_widget) {
Gtk::EventBox::on_size_allocate (alloc);
} else {
memcpy (&_allocation, &alloc, sizeof(Gtk::Allocation));
}
if (_use_image_surface) {
image_surface.clear ();
image_surface = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, alloc.get_width(), alloc.get_height());
}
if (_canvas_widget) {
return;
}
#ifdef __APPLE__
if (_nsglview) {
gint xx, yy;
gtk_widget_translate_coordinates(
GTK_WIDGET(gobj()),
GTK_WIDGET(get_toplevel()->gobj()),
0, 0, &xx, &yy);
Gtkmm2ext::nsglview_resize (_nsglview, xx, yy, alloc.get_width(), alloc.get_height());
}
#endif
set_dirty ();
}
Gdk::Color
CairoWidget::get_parent_bg ()
{
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Widget* parent;
parent = get_parent ();
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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();
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if (_current_parent != parent) {
if (_parent_style_change) _parent_style_change.disconnect();
_current_parent = parent;
_parent_style_change = parent->signal_style_changed().connect (mem_fun (*this, &CairoWidget::on_style_changed));
}
return style->get_bg (Gtk::STATE_NORMAL);
}
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if (!parent->get_has_window()) {
parent = parent->get_parent();
} else {
break;
}
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}
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if (parent && parent->get_has_window()) {
if (_current_parent != parent) {
if (_parent_style_change) _parent_style_change.disconnect();
_current_parent = parent;
_parent_style_change = parent->signal_style_changed().connect (mem_fun (*this, &CairoWidget::on_style_changed));
}
return parent->get_style ()->get_bg (Gtk::STATE_NORMAL);
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}
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 ();
}
}
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void
CairoWidget::on_style_changed (const Glib::RefPtr<Gtk::Style>&)
{
set_dirty ();
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}
void
CairoWidget::on_realize ()
{
Gtk::EventBox::on_realize();
#ifdef __APPLE__
if (_nsglview) {
Gtkmm2ext::nsglview_overlay (_nsglview, get_window()->gobj());
}
#endif
}
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void
CairoWidget::on_map ()
{
Gtk::EventBox::on_map();
#ifdef __APPLE__
if (_nsglview) {
Gtkmm2ext::nsglview_set_visible (_nsglview, true);
Gtk::Allocation a = get_allocation();
gint xx, yy;
gtk_widget_translate_coordinates(
GTK_WIDGET(gobj()),
GTK_WIDGET(get_toplevel()->gobj()),
0, 0, &xx, &yy);
Gtkmm2ext::nsglview_resize (_nsglview, xx, yy, a.get_width(), a.get_height());
}
#endif
}
void
CairoWidget::on_unmap ()
{
Gtk::EventBox::on_unmap();
#ifdef __APPLE__
if (_nsglview) {
Gtkmm2ext::nsglview_set_visible (_nsglview, false);
}
#endif
}
void
CairoWidget::on_state_changed (Gtk::StateType)
{
/* this will catch GTK-level state changes from calls like
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::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));
}
set_dirty ();
}
void
CairoWidget::set_draw_background (bool yn)
{
_need_bg = yn;
}
void
CairoWidget::provide_background_for_cairo_widget (Gtk::Widget& w, const Gdk::Color& bg)
{
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/* 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);
}
void
CairoWidget::set_focus_handler (sigc::slot<void,Gtk::Widget*> s)
{
focus_handler = s;
}
void
CairoWidget::on_widget_name_changed ()
{
Glib::ustring name = get_name();
if (_widget_name == name) {
return;
}
_widget_name = name;
on_name_changed ();
}