//$Id: mywidget.cc 961 2008-02-02 22:56:36Z kmaraas $ -*- c++ -*- /* gtkmm example Copyright (C) 2004 gtkmm development team * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 * as published by the Free Software Foundation. * * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include "mywidget.h" #include <gdkmm/drawable.h> #include <gdkmm/general.h> // for cairo helper functions #include <iostream> #include <string.h> //#include <gtk/gtkwidget.h> //For GTK_IS_WIDGET() MyWidget::MyWidget() : //The GType name will actually be gtkmm__CustomObject_mywidget Glib::ObjectBase("mywidget"), Gtk::Widget(), m_scale(1000) { set_flags(Gtk::NO_WINDOW); //This shows the GType name, which must be used in the RC file. std::cout << "GType name: " << G_OBJECT_TYPE_NAME(gobj()) << std::endl; //This show that the GType still derives from GtkWidget: //std::cout << "Gtype is a GtkWidget?:" << GTK_IS_WIDGET(gobj()) << std::endl; //Install a style so that an aspect of this widget may be themed via an RC //file: gtk_widget_class_install_style_property(GTK_WIDGET_CLASS( G_OBJECT_GET_CLASS(gobj())), g_param_spec_int("example_scale", "Scale of Example Drawing", "The scale to use when drawing. This is just a silly example.", G_MININT, G_MAXINT, 0, G_PARAM_READABLE) ); gtk_rc_parse("custom_gtkrc"); } MyWidget::~MyWidget() { } void MyWidget::on_size_request(Gtk::Requisition* requisition) { //Initialize the output parameter: *requisition = Gtk::Requisition(); //Discover the total amount of minimum space needed by this widget. //Let's make this simple example widget always need 50 by 50: requisition->height = 50; requisition->width = 50; } void MyWidget::on_size_allocate(Gtk::Allocation& allocation) { //Do something with the space that we have actually been given: //(We will not be given heights or widths less than we have requested, though //we might get more) //Use the offered allocation for this container: set_allocation(allocation); if(m_refGdkWindow) { m_refGdkWindow->move_resize( allocation.get_x(), allocation.get_y(), allocation.get_width(), allocation.get_height() ); } } void MyWidget::on_map() { //Call base class: Gtk::Widget::on_map(); } void MyWidget::on_unmap() { //Call base class: Gtk::Widget::on_unmap(); } void MyWidget::on_realize() { //Call base class: Gtk::Widget::on_realize(); ensure_style(); //Get the themed style from the RC file: get_style_property("example_scale", m_scale); std::cout << "m_scale (example_scale from the theme/rc-file) is: " << m_scale << std::endl; if(!m_refGdkWindow) { //Create the GdkWindow: GdkWindowAttr attributes; memset(&attributes, 0, sizeof(attributes)); Gtk::Allocation allocation = get_allocation(); //Set initial position and size of the Gdk::Window: attributes.x = allocation.get_x(); attributes.y = allocation.get_y(); attributes.width = allocation.get_width(); attributes.height = allocation.get_height(); attributes.event_mask = get_events () | Gdk::EXPOSURE_MASK; attributes.window_type = GDK_WINDOW_CHILD; attributes.wclass = GDK_INPUT_OUTPUT; m_refGdkWindow = Gdk::Window::create(get_window() /* parent */, &attributes, GDK_WA_X | GDK_WA_Y); unset_flags(Gtk::NO_WINDOW); set_window(m_refGdkWindow); //set colors modify_bg(Gtk::STATE_NORMAL , Gdk::Color("red")); modify_fg(Gtk::STATE_NORMAL , Gdk::Color("blue")); //make the widget receive expose events m_refGdkWindow->set_user_data(gobj()); } } void MyWidget::on_unrealize() { m_refGdkWindow.clear(); //Call base class: Gtk::Widget::on_unrealize(); } bool MyWidget::on_expose_event(GdkEventExpose* event) { if(m_refGdkWindow) { double scale_x = (double)get_allocation().get_width() / m_scale; double scale_y = (double)get_allocation().get_height() / m_scale; Cairo::RefPtr<Cairo::Context> cr = m_refGdkWindow->create_cairo_context(); if (event) { // clip to the area that needs to be re-exposed so we don't draw any // more than we need to. cr->rectangle(event->area.x, event->area.y, event->area.width, event->area.height); cr->clip(); } // paint the background Gdk::Cairo::set_source_color(cr, get_style()->get_bg(Gtk::STATE_NORMAL)); cr->paint(); // draw the foreground Gdk::Cairo::set_source_color(cr, get_style()->get_fg(Gtk::STATE_NORMAL)); cr->move_to(155.*scale_x, 165.*scale_y); cr->line_to(155.*scale_x, 838.*scale_y); cr->line_to(265.*scale_x, 900.*scale_y); cr->line_to(849.*scale_x, 564.*scale_y); cr->line_to(849.*scale_x, 438.*scale_y); cr->line_to(265.*scale_x, 100.*scale_y); cr->line_to(155.*scale_x, 165.*scale_y); cr->move_to(265.*scale_x, 100.*scale_y); cr->line_to(265.*scale_x, 652.*scale_y); cr->line_to(526.*scale_x, 502.*scale_y); cr->move_to(369.*scale_x, 411.*scale_y); cr->line_to(633.*scale_x, 564.*scale_y); cr->move_to(369.*scale_x, 286.*scale_y); cr->line_to(369.*scale_x, 592.*scale_y); cr->move_to(369.*scale_x, 286.*scale_y); cr->line_to(849.*scale_x, 564.*scale_y); cr->move_to(633.*scale_x, 564.*scale_y); cr->line_to(155.*scale_x, 838.*scale_y); cr->stroke(); } return true; }