/* gtkmm example Copyright (C) 2006 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 "previewdialog.h" #include "printformoperation.h" #include <math.h> PreviewDialog::PreviewDialog( PrintFormOperation* pfo, const Glib::RefPtr<Gtk::PrintOperationPreview>& preview, const Glib::RefPtr<Gtk::PrintContext>& print_ctx, Gtk::Window& parent) : m_pOperation(pfo), m_refPreview(preview), m_refPrintContext(print_ctx), m_SpinAdjustment(1, 100, 1), //Used to construct m_PageSpin m_PageSpin(m_SpinAdjustment, 1, 0), m_CloseButton(Gtk::Stock::CLOSE), m_Page(1), m_DpiX(0), m_DpiY(0) { set_transient_for(parent); set_title("Preview"); set_border_width(2); add(m_VBox); m_HBox.pack_start(m_PageSpin); m_HBox.pack_start(m_CloseButton, Gtk::PACK_SHRINK); m_VBox.pack_start(m_HBox, Gtk::PACK_SHRINK); m_DrawingArea.set_size_request(200, 300); m_VBox.pack_start(m_DrawingArea, Gtk::PACK_EXPAND_WIDGET); m_DrawingArea.set_double_buffered(false); m_refPreview->signal_ready().connect( sigc::mem_fun(*this, &PreviewDialog::on_popreview_ready)); m_refPreview->signal_got_page_size().connect( sigc::mem_fun(*this, &PreviewDialog::on_popreview_got_page_size)); m_DrawingArea.signal_realize().connect( sigc::mem_fun(*this, &PreviewDialog::on_drawing_area_realized)); m_DrawingArea.signal_expose_event().connect( sigc::mem_fun(*this, &PreviewDialog::on_drawing_area_expose_event)); m_CloseButton.signal_clicked().connect( sigc::mem_fun(*this, &PreviewDialog::on_close_clicked)); m_PageSpin.signal_value_changed().connect( sigc::mem_fun(*this, &PreviewDialog::on_page_number_changed)); show_all_children(); } PreviewDialog::~PreviewDialog() { } void PreviewDialog::on_drawing_area_realized() { Glib::RefPtr<Gdk::Window> gdk_window = m_DrawingArea.get_window(); if(gdk_window) { Cairo::RefPtr<Cairo::Context> cairo_ctx = gdk_window->create_cairo_context(); if(m_refPrintContext) m_refPrintContext->set_cairo_context(cairo_ctx, 72, 72); } } void PreviewDialog::on_page_number_changed() { m_Page = m_PageSpin.get_value_as_int(); m_DrawingArea.queue_draw(); } bool PreviewDialog::on_drawing_area_expose_event(GdkEventExpose* /* event */) { Glib::RefPtr<Gdk::Window> window = m_DrawingArea.get_window(); if(window) window->clear(); if(m_refPreview) m_refPreview->render_page(m_Page - 1); return true; } void PreviewDialog::on_popreview_ready(const Glib::RefPtr<Gtk::PrintContext>&) { m_PageSpin.set_range(1.0, m_pOperation->property_n_pages()); m_DrawingArea.queue_draw(); } void PreviewDialog::on_popreview_got_page_size( const Glib::RefPtr<Gtk::PrintContext>& print_ctx, const Glib::RefPtr<Gtk::PageSetup>& page_setup) { Gtk::PaperSize paper_size = page_setup->get_paper_size(); double width = paper_size.get_width(Gtk::UNIT_INCH); double height = paper_size.get_height(Gtk::UNIT_INCH); if(m_DrawingArea.is_realized()) //Avoid getting an odd allocation. { double dpi_x = m_DrawingArea.get_allocation().get_width() / width; double dpi_y = m_DrawingArea.get_allocation().get_height() / height; // We create a cairo context for the DrawingArea and then give that cairo // context to the PrintOperation's pango layout so that render_page() will // render into the drawing area. Cairo::RefPtr<Cairo::Context> cairo_ctx = m_DrawingArea.get_window()->create_cairo_context(); if (fabs(dpi_x - m_DpiX) > 0.001 || fabs(dpi_y - m_DpiY) > 0.001) { print_ctx->set_cairo_context(cairo_ctx, dpi_x, dpi_y); m_DpiX = dpi_x; m_DpiY = dpi_y; } if(m_pOperation) { Glib::RefPtr<Pango::Layout> layout = m_pOperation->get_pango_layout(); if(layout) layout->update_from_cairo_context(cairo_ctx); } } } void PreviewDialog::on_hide() { m_refPreview->end_preview(); //We will not be using these anymore, so null the RefPtrs: m_refPreview.clear(); m_refPrintContext.clear(); } void PreviewDialog::on_close_clicked() { hide(); }