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Diffstat (limited to 'libs/gtkmm2ext/cairo_widget.cc')
| -rw-r--r-- | libs/gtkmm2ext/cairo_widget.cc | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/libs/gtkmm2ext/cairo_widget.cc b/libs/gtkmm2ext/cairo_widget.cc new file mode 100644 index 0000000000..b6717252ab --- /dev/null +++ b/libs/gtkmm2ext/cairo_widget.cc @@ -0,0 +1,178 @@ +/* + 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::ActiveState (0)) + , _visual_state (Gtkmm2ext::VisualState (0)) + , _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::Active); + } 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); +} |