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/* $Id: pdfviewer.c,v 1.4 2011/05/27 10:55:19 khorben Exp $ */

static char const _copyright[] =

static char const _license[] =

"This program is free software; you can redistribute it and/or modify\n"

"it under the terms of the GNU General Public License as published by the\n"

"Free Software Foundation, version 3 of the License.\n"

"\n"

"This program is distributed in the hope that it will be useful,\n"

"but WITHOUT ANY WARRANTY; without even the implied warranty of\n"

"MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n"

"GNU General Public License for more details.\n"

"\n"

"You should have received a copy of the GNU General Public License\n"

"along with this program. If not, see <http://www.gnu.org/licenses/>.\n";

#include <sys/stat.h>

#include <stdlib.h>

#include <string.h>

#include <errno.h>

#include <math.h>

#include <gdk/gdkkeysyms.h>

#include <poppler.h>

#include <Desktop.h>

#include "callbacks.h"

#include "pdfviewer.h"

#include "../config.h"

/* PDFviewer */

/* private */

/* types */

struct _PDFviewer

{

PDF * pdf;

/* widgets */

GtkWidget * window;

GtkWidget * view;

GtkWidget * statusbar;

GtkWidget * toolbar;

/* about */

GtkWidget * ab_window;

};

struct _PDF

{

PopplerDocument *document;

int pages;

int current;

GtkWidget *area;

cairo_surface_t *surface;

double scale;

};

/* variables */

static char const * _authors[] =

{

"Sébastien Bocahu <zecrazytux@zecrazytux.net>",

"Pierre Pronchery <khorben@defora.org>",

NULL

};

#ifdef EMBEDDED

static DesktopAccel _pdfviewer_accel[] =

{

{ G_CALLBACK(on_pdf_close), GDK_CONTROL_MASK, GDK_w },

{ G_CALLBACK(on_open), GDK_CONTROL_MASK, GDK_o },

{ G_CALLBACK(on_previous), GDK_CONTROL_MASK, GDK_p },

{ G_CALLBACK(on_next), GDK_CONTROL_MASK, GDK_n },

{ NULL, 0, 0 }

};

#endif

#ifndef EMBEDDED

static DesktopMenu _pdfviewer_menu_file[] =

{

{ "_Open", G_CALLBACK(on_file_open), GTK_STOCK_OPEN, GDK_CONTROL_MASK,

GDK_o },

{ "", NULL, NULL, 0, 0 },

{ "_Close", G_CALLBACK(on_file_close), GTK_STOCK_CLOSE,

GDK_CONTROL_MASK, GDK_w },

{ NULL, NULL, NULL, 0, 0 }

};

static DesktopMenu _pdfviewer_menu_edit[] =

{

{ NULL, NULL, NULL, 0, 0 }

};

static DesktopMenu _pdfviewer_menu_view[] =

{

{ "Zoom in", G_CALLBACK(on_view_zoom_in), "zoom-in",

GDK_CONTROL_MASK, GDK_KEY_plus },

{ "Zoom out", G_CALLBACK(on_view_zoom_out), "zoom-out",

GDK_CONTROL_MASK, GDK_KEY_minus },

{ NULL, NULL, NULL, 0, 0 }

};

static DesktopMenu _pdfviewer_menu_help[] =

{

{ "_About", G_CALLBACK(on_help_about),

#if GTK_CHECK_VERSION(2, 6, 0)

GTK_STOCK_ABOUT, 0, 0 },

#else

NULL, 0, 0 },

#endif

{ NULL, NULL, NULL, 0, 0 }

};

static DesktopMenubar _pdfviewer_menubar[] =

{

{ "_File", _pdfviewer_menu_file },

{ "_Edit", _pdfviewer_menu_edit },

{ "_View", _pdfviewer_menu_view },

{ "_Help", _pdfviewer_menu_help },

{ NULL, NULL }

};

#endif

static DesktopToolbar _pdfviewer_toolbar[] =

{

{ "Open", G_CALLBACK(on_open), GTK_STOCK_OPEN, 0, 0, NULL },

{ "FarBefore", G_CALLBACK(on_far_before), GTK_STOCK_MEDIA_PREVIOUS,

0, 0, NULL },

{ "Previous", G_CALLBACK(on_previous), GTK_STOCK_GO_BACK,

0, 0, NULL },

{ "Next", G_CALLBACK(on_next), GTK_STOCK_GO_FORWARD, 0, 0, NULL },

{ "FarAfter", G_CALLBACK(on_far_after), GTK_STOCK_MEDIA_NEXT, 0, 0, NULL },

{ "ZoomIn", G_CALLBACK(on_zoom_in), GTK_STOCK_ZOOM_IN, 0, 0, NULL },

{ "ZoomOut", G_CALLBACK(on_zoom_out), GTK_STOCK_ZOOM_OUT, 0, 0, NULL },

{ NULL, NULL, NULL, 0, 0, NULL }

};

/* public */

/* functions */

/* pdfviewer_new */

static void _new_set_title(PDFviewer * pdfviewer);

PDFviewer * pdfviewer_new(void)

{

PDFviewer * pdfviewer;

GtkAccelGroup * group;

GtkSettings * settings;

GtkWidget * vbox;

GtkWidget * widget;

if((pdfviewer = malloc(sizeof(*pdfviewer))) == NULL)

return NULL;

settings = gtk_settings_get_default();

pdfviewer->pdf = NULL;

/* widgets */

group = gtk_accel_group_new();

pdfviewer->window = gtk_window_new(GTK_WINDOW_TOPLEVEL);

gtk_window_add_accel_group(GTK_WINDOW(pdfviewer->window), group);

gtk_window_set_default_size(GTK_WINDOW(pdfviewer->window), 600, 400);

_new_set_title(pdfviewer);

#if GTK_CHECK_VERSION(2, 6, 0)

gtk_window_set_icon_name(GTK_WINDOW(pdfviewer->window),

"gnome-mime-application-pdf");

#endif

g_signal_connect_swapped(G_OBJECT(pdfviewer->window), "delete-event",

G_CALLBACK(on_closex), pdfviewer);

vbox = gtk_vbox_new(FALSE, 0);

/* menubar */

#ifndef EMBEDDED

widget = desktop_menubar_create(_pdfviewer_menubar, pdfviewer, group);

gtk_box_pack_start(GTK_BOX(vbox), widget, FALSE, FALSE, 0);

#else

desktop_accel_create(_pdfviewer_accel, pdfviewer, group);

#endif

/* toolbar */

pdfviewer->toolbar = desktop_toolbar_create(_pdfviewer_toolbar,

pdfviewer, group);

set_prevnext_sensitivity(pdfviewer);

gtk_box_pack_start(GTK_BOX(vbox), pdfviewer->toolbar, FALSE, FALSE, 0);

/* view */

widget = gtk_scrolled_window_new(NULL, NULL);

gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(widget),

GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);

pdfviewer->view = gtk_drawing_area_new();

gtk_scrolled_window_add_with_viewport(GTK_SCROLLED_WINDOW(widget),

pdfviewer->view);

gtk_box_pack_start(GTK_BOX(vbox), widget, TRUE, TRUE, 0);

/* statusbar */

pdfviewer->statusbar = gtk_statusbar_new();

gtk_box_pack_start(GTK_BOX(vbox), pdfviewer->statusbar,

FALSE, FALSE, 0);

/* about */

pdfviewer->ab_window = NULL;

gtk_container_add(GTK_CONTAINER(pdfviewer->window), vbox);

gtk_widget_show_all(pdfviewer->window);

return pdfviewer;

}

static void _new_set_title(PDFviewer * pdfviewer)

{

char buf[256];

snprintf(buf, sizeof(buf), "%s%s", "PDF viewer - ",

(pdfviewer->pdf == NULL) ? "(Untitled)"

: "FIXME"); /* FIXME */

gtk_window_set_title(GTK_WINDOW(pdfviewer->window), buf);

}

/* pdfviewer_delete */

void pdfviewer_delete(PDFviewer * pdfviewer)

{

#ifdef DEBUG

fprintf(stderr, "DEBUG: %s()\n", __func__);

#endif

#if 0 /* FIXME */

if(pdfviewer->pdf != NULL)

pdf_delete(pdfviewer->pdf);

#endif

free(pdfviewer);

}

/* useful */

/* pdfviewer_about */

static gboolean _about_on_closex(GtkWidget * widget);

void pdfviewer_about(PDFviewer * pdfviewer)

{

if(pdfviewer->ab_window != NULL)

{

gtk_widget_show(pdfviewer->ab_window);

return;

}

pdfviewer->ab_window = desktop_about_dialog_new();

gtk_window_set_transient_for(GTK_WINDOW(pdfviewer->ab_window),

GTK_WINDOW(pdfviewer->window));

g_signal_connect(G_OBJECT(pdfviewer->ab_window), "delete-event",

G_CALLBACK(_about_on_closex), NULL);

desktop_about_dialog_set_authors(pdfviewer->ab_window, _authors);

desktop_about_dialog_set_copyright(pdfviewer->ab_window, _copyright);

desktop_about_dialog_set_license(pdfviewer->ab_window, _license);

desktop_about_dialog_set_logo_icon_name(pdfviewer->ab_window,

"document-print-preview");

desktop_about_dialog_set_name(pdfviewer->ab_window, PACKAGE);

desktop_about_dialog_set_version(pdfviewer->ab_window, VERSION);

gtk_widget_show(pdfviewer->ab_window);

}

static gboolean _about_on_closex(GtkWidget * widget)

{

gtk_widget_hide(widget);

return TRUE;

}

/* pdfviewer_error */

int pdfviewer_error(PDFviewer * pdfviewer, char const * message, int ret)

{

GtkWidget * dialog;

dialog = gtk_message_dialog_new(GTK_WINDOW(pdfviewer->window),

GTK_DIALOG_DESTROY_WITH_PARENT,

GTK_MESSAGE_ERROR, GTK_BUTTONS_CLOSE,

#if GTK_CHECK_VERSION(2, 6, 0)

"%s", "Error");

gtk_message_dialog_format_secondary_text(GTK_MESSAGE_DIALOG(dialog),

#endif

"%s", message);

gtk_window_set_title(GTK_WINDOW(dialog), "Error");

g_signal_connect(G_OBJECT(dialog), "response", G_CALLBACK(

gtk_widget_destroy), NULL);

gtk_widget_show(dialog);

return ret;

}

/* pdfviewer_close */

gboolean pdfviewer_close(PDFviewer * pdfviewer)

{

#ifdef DEBUG

fprintf(stderr, "DEBUG: %s()\n", __func__);

#endif

/* FIXME implement */

gtk_main_quit();

return FALSE;

}

/* pdfviewer_open */

void pdfviewer_open(PDFviewer * pdfviewer, char const * uri)

{

#ifdef DEBUG

fprintf(stderr, "DEBUG: %s()\n", __func__);

#endif

/* FIXME handle errors */

if(uri == NULL)

return;

if(pdfviewer->pdf != NULL)

pdf_close(pdfviewer);

if(pdf_open(pdfviewer, uri) != 0)

return;

_new_set_title(pdfviewer); /* XXX make it a generic private function */

}

/* pdfviewer_open_dialog */

void pdfviewer_open_dialog(PDFviewer * pdfviewer)

{

GtkWidget * dialog;

GtkFileFilter * filter;

char * uri = NULL;

#ifdef DEBUG

fprintf(stderr, "DEBUG: %s()\n", __func__);

#endif

dialog = gtk_file_chooser_dialog_new("Open file...",

GTK_WINDOW(pdfviewer->window),

GTK_FILE_CHOOSER_ACTION_OPEN,

GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,

GTK_STOCK_OPEN, GTK_RESPONSE_ACCEPT, NULL);

filter = gtk_file_filter_new();

gtk_file_filter_set_name(filter, "PDF documents");

gtk_file_filter_add_mime_type(filter, "application/pdf");

gtk_file_chooser_add_filter(GTK_FILE_CHOOSER(dialog), filter);

if(gtk_dialog_run(GTK_DIALOG(dialog)) == GTK_RESPONSE_ACCEPT)

uri = gtk_file_chooser_get_uri(GTK_FILE_CHOOSER(

dialog));

gtk_widget_destroy(dialog);

if(uri == NULL)

return;

pdfviewer_open(pdfviewer, uri);

g_free(uri);

}

/* pdf_open */

int pdf_open(PDFviewer * pdfviewer, const char * uri)

{

GError * err = NULL;

#ifdef DEBUG

fprintf(stderr, "DEBUG: %s()\n", __func__);

#endif

pdfviewer->pdf = g_new0(PDF, 1);

pdfviewer->pdf->document =

poppler_document_new_from_file(uri, NULL, &err);

if(err != NULL) {

fprintf(stderr, "error: %s", err->message);

g_error_free (err);

return 1;

}

pdfviewer->pdf->pages =

poppler_document_get_n_pages(pdfviewer->pdf->document);

pdf_update_current(pdfviewer, '=', 0);

/* pdfviewer->pdf->scale = 1.0;

pdf_load_page(pdfviewer);

return 0;

}

/* pdf_close */

void pdf_close(PDFviewer * pdfviewer)

{

#ifdef DEBUG

fprintf(stderr, "DEBUG: %s()\n", __func__);

#endif

gdk_window_clear(gtk_widget_get_window(pdfviewer->view));

if(pdfviewer->pdf != NULL)

free(pdfviewer->pdf);

}

/* pdf_load_page */

void pdf_load_page(PDFviewer * pdfviewer)

{

PopplerPage *page;

cairo_t *cr;

gdouble width, height;

GtkAllocation view_allocation;

#ifdef DEBUG

fprintf(stderr, "DEBUG: %s()\n", __func__);

#endif

page = poppler_document_get_page(pdfviewer->pdf->document,

pdfviewer->pdf->current);

poppler_page_get_size(page, &width, &height);

if(!pdfviewer->pdf->scale) {

/* gdk_drawable_get_size(gtk_widget_get_window(pdfviewer->view), &w, &h); */

#ifdef DEBUG

fprintf(stderr, "DEBUG: %s() scale not set!\n", __func__);

#endif

gtk_widget_get_allocation(pdfviewer->view, &view_allocation);

pdfviewer->pdf->scale = ((view_allocation.width - 20) / width);

#if 0

pdfviewer->pdf->scale = (view_allocation.height / height); /* view whole page */

#endif

}

if (!page)

return;

gtk_statusbar_push(GTK_STATUSBAR(pdfviewer->statusbar),

gtk_statusbar_get_context_id(

GTK_STATUSBAR(pdfviewer->statusbar), "read-page"),

g_strdup_printf("Page %d/%d",

pdfviewer->pdf->current + 1, pdfviewer->pdf->pages));

if (pdfviewer->pdf->surface)

cairo_surface_destroy (pdfviewer->pdf->surface);

pdfviewer->pdf->surface = NULL;

#ifdef DEBUG

fprintf(stderr, "DEBUG: %s() scale: %f\n", __func__,

pdfviewer->pdf->scale);

#endif

pdfviewer->pdf->surface = cairo_image_surface_create(

CAIRO_FORMAT_ARGB32, ceil(pdfviewer->pdf->scale * width),

ceil(pdfviewer->pdf->scale * height));

cr = cairo_create(pdfviewer->pdf->surface);

cairo_save(cr);

cairo_scale(cr, pdfviewer->pdf->scale, pdfviewer->pdf->scale);

poppler_page_render(page, cr);

cairo_restore(cr);

cairo_destroy(cr);

g_object_unref(page);

g_signal_connect(G_OBJECT(pdfviewer->view), "expose-event",

G_CALLBACK(pdf_render_area),

(gpointer) pdfviewer->pdf);

gtk_widget_set_size_request(pdfviewer->view,

pdfviewer->pdf->scale * ceil(width),

pdfviewer->pdf->scale * ceil(height));

gtk_widget_queue_draw(pdfviewer->view);

}

/* pdf_render_area */

void pdf_render_area(GtkWidget *area, GdkEventExpose *event, void * data)

{

PDF * pdf = data;

cairo_t *cr;

#ifdef DEBUG

fprintf(stderr, "DEBUG: %s()\n", __func__);

#endif

gdk_window_clear(gtk_widget_get_window(area));

if(pdf == NULL)

return;

cr = gdk_cairo_create(gtk_widget_get_window(area));

cairo_set_source_surface(cr, pdf->surface, 0, 0);

cairo_paint(cr);

cairo_destroy(cr);

}

/* pdf_update_current */

void pdf_update_current(PDFviewer * pdfviewer, const char op, int n)

{

#ifdef DEBUG

fprintf(stderr, "DEBUG: %s()\n", __func__);

#endif

switch(op) {

case '=': if((n >= 0) &&

(n <= (pdfviewer->pdf->pages - 1)))

pdfviewer->pdf->current = n;

break;

case '+': if((pdfviewer->pdf->current + n)

<= pdfviewer->pdf->pages)

pdfviewer->pdf->current =

pdfviewer->pdf->current + n;

break;

case '-': if((pdfviewer->pdf->current - n) >= 0)

pdfviewer->pdf->current =

pdfviewer->pdf->current - n;

break;

}

set_prevnext_sensitivity(pdfviewer);

}

/* set_prevnext_sensitivity */

void set_prevnext_sensitivity(PDFviewer * pdfviewer)

{

gboolean farbefore, prev, next, farafter;

if(pdfviewer->pdf) { /* XXX s/5/preferences/ */

farbefore = (pdfviewer->pdf->current > 5) ? TRUE : FALSE;

prev = (pdfviewer->pdf->current > 0) ? TRUE : FALSE;

next = (pdfviewer->pdf->current+1 < pdfviewer->pdf->pages) ?

TRUE : FALSE;

farafter = (pdfviewer->pdf->current+5 < pdfviewer->pdf->pages) ?

TRUE : FALSE;

} else {

farbefore = FALSE;

prev = FALSE;

next = FALSE;

farafter = FALSE;

}

gtk_widget_set_sensitive(GTK_WIDGET(

gtk_toolbar_get_nth_item(GTK_TOOLBAR(pdfviewer->toolbar), 1)

), farbefore);

gtk_widget_set_sensitive(GTK_WIDGET(

gtk_toolbar_get_nth_item(GTK_TOOLBAR(pdfviewer->toolbar), 2)

), prev);

gtk_widget_set_sensitive(GTK_WIDGET(

gtk_toolbar_get_nth_item(GTK_TOOLBAR(pdfviewer->toolbar), 3)

), next);

gtk_widget_set_sensitive(GTK_WIDGET(

gtk_toolbar_get_nth_item(GTK_TOOLBAR(pdfviewer->toolbar), 4)

), farafter);

}

/* pdf_update_scale */

void pdf_update_scale(PDFviewer * pdfviewer, const char op, double n)

{

#ifdef DEBUG

fprintf(stderr, "DEBUG: %s()\n", __func__);

#endif

switch(op) {

case '=': pdfviewer->pdf->scale = n;

break;

case '+': pdfviewer->pdf->scale =

pdfviewer->pdf->scale + n;

break;

case '-': if((pdfviewer->pdf->scale - n) > 0)

pdfviewer->pdf->scale =

pdfviewer->pdf->scale - n;

break;

}

pdf_load_page(pdfviewer);

}