Paul Davis
fdf0db02a0
git-svn-id: svn://localhost/ardour2/branches/3.0@7184 d708f5d6-7413-0410-9779-e7cbd77b26cf
112 lines
2.2 KiB
C++
112 lines
2.2 KiB
C++
/*
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Copyright (C) 2009 Paul Davis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "cairo_widget.h"
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#include "gui_thread.h"
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CairoWidget::CairoWidget ()
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: _width (1),
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_height (1),
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_dirty (true),
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_pixmap (0)
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{
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}
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CairoWidget::~CairoWidget ()
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{
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if (_pixmap) {
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g_object_unref (_pixmap);
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}
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}
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bool
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CairoWidget::on_expose_event (GdkEventExpose *event)
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{
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Gdk::Rectangle const exposure (
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event->area.x, event->area.y, event->area.width, event->area.height
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);
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Gdk::Rectangle r = exposure;
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Gdk::Rectangle content (0, 0, _width, _height);
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bool intersects;
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r.intersect (content, intersects);
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if (intersects) {
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GdkDrawable* drawable = get_window()->gobj ();
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if (_dirty) {
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if (_pixmap) {
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g_object_unref (_pixmap);
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}
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_pixmap = gdk_pixmap_new (drawable, _width, _height, -1);
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cairo_t* cr = gdk_cairo_create (_pixmap);
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render (cr);
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cairo_destroy (cr);
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_dirty = false;
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}
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gdk_draw_drawable (
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drawable,
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get_style()->get_fg_gc (Gtk::STATE_NORMAL)->gobj(),
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_pixmap,
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r.get_x(),
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r.get_y(),
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r.get_x(),
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r.get_y(),
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r.get_width(),
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r.get_height()
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);
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}
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return true;
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}
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/** Marks the widget as dirty, so that render () will be called on
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* the next GTK expose event.
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*/
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void
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CairoWidget::set_dirty ()
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{
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ENSURE_GUI_THREAD (*this, &CairoWidget::set_dirty)
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_dirty = true;
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queue_draw ();
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}
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/** Handle a size allocation.
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* @param alloc GTK allocation.
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*/
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void
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CairoWidget::on_size_allocate (Gtk::Allocation& alloc)
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{
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Gtk::EventBox::on_size_allocate (alloc);
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_width = alloc.get_width ();
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_height = alloc.get_height ();
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set_dirty ();
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}
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