/**
 * @file
 * PNG export dialog.
 */
/* Authors:
 *   Lauris Kaplinski <lauris@kaplinski.com>
 *   bulia byak <buliabyak@users.sf.net>
 *   Johan Engelen <j.b.c.engelen@ewi.utwente.nl>
 *   Jon A. Cruz <jon@joncruz.org>
 *   Abhishek Sharma
 *
 * Copyright (C) 1999-2007 Authors
 * Copyright (C) 2001-2002 Ximian, Inc.
 *
 * Released under GNU GPL, read the file 'COPYING' for more information
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

// This has to be included prior to anything that includes setjmp.h, it croaks otherwise
#include <png.h>

#include <gtkmm/box.h>
#include <gtkmm/buttonbox.h>
#include <gtkmm/label.h>
#include <gtkmm/widget.h>
#include <gtkmm/togglebutton.h>
#include <gtkmm/entry.h>
#include <gtkmm/image.h>
#include <gtkmm/stockid.h>
#include <gtkmm/stock.h>
#include <gtkmm/table.h>
#ifdef WITH_GNOME_VFS
# include <libgnomevfs/gnome-vfs-init.h>  // gnome_vfs_initialized
#endif

#include <glibmm/i18n.h>
#include "helper/unit-menu.h"
#include "helper/units.h"
#include "unit-constants.h"
#include "helper/window.h"
#include "inkscape-private.h"
#include "document.h"
#include "document-undo.h"
#include "desktop-handles.h"
#include "sp-item.h"
#include "selection.h"
#include "file.h"
#include "macros.h"
#include "sp-namedview.h"
#include "selection-chemistry.h"

#include "dialogs/dialog-events.h"
#include "preferences.h"
#include "verbs.h"
#include "interface.h"
#include "sp-root.h"

#include "extension/output.h"
#include "extension/db.h"

#include "io/sys.h"

#include "helper/png-write.h"

#ifdef WIN32
#include <windows.h>
#include <commdlg.h>
#include <gdk/gdkwin32.h>
#endif

#include <gtk/gtk.h>

#define SP_EXPORT_MIN_SIZE 1.0

#define DPI_BASE PX_PER_IN

#define EXPORT_COORD_PRECISION 3

#include "../../desktop-handles.h"
#include "../../document.h"
#include "../../document-undo.h"
#include "verbs.h"
#include "export.h"


namespace Inkscape {
namespace UI {
namespace Dialog {

Export::Export (void) :
    UI::Widget::Panel ("", "/dialogs/export/", SP_VERB_DIALOG_EXPORT),
    current_key(SELECTION_PAGE),
    original_name(NULL),
    doc_export_name(NULL),
    filename_modified(false),
    was_empty(true),
    update(false),
    togglebox(true, 0),
    area_box(false, 3),
    singleexport_box(false, 0),
    size_box(false, 3),
    file_box(false, 3),
    unitbox(false, 0),
    units_label(_("Units:")),
    filename_box(false, 5),
    browse_label(_("_Browse..."), 1),
    browse_image(Gtk::StockID(Gtk::Stock::INDEX), Gtk::ICON_SIZE_BUTTON),
    batch_box(false, 5),
    batch_export(_("B_atch export all selected objects"), _("Export each selected object into its own PNG file, using export hints if any (caution, overwrites without asking!)")),
    hide_box(false, 5),
    hide_export(_("Hide a_ll except selected"), _("In the exported image, hide all objects except those that are selected")),
    button_box(Gtk::BUTTONBOX_END),
    export_label(_("_Export"), 1),
    export_image(Gtk::StockID(Gtk::Stock::APPLY), Gtk::ICON_SIZE_BUTTON),
    prefs(NULL),
    desktop(NULL),
    deskTrack(),
    selectChangedConn(),
    subselChangedConn(),
    selectModifiedConn()
{
    prefs = Inkscape::Preferences::get();

    singleexport_box.set_border_width(0);

    /* Export area frame */
    {

    #if WITH_GTKMM_2_22
        Gtk::Label* lbl = new Gtk::Label(_("<big><b>Export area</b></big>"), Gtk::ALIGN_START);
    #else
        Gtk::Label* lbl = new Gtk::Label(_("<big><b>Export area</b></big>"), Gtk::ALIGN_LEFT);
    #endif
        lbl->set_use_markup(true);
        area_box.pack_start(*lbl);

        /* Units box */
        /* gets added to the vbox later, but the unit selector is needed
           earlier than that */
        unit_selector = Glib::wrap(sp_unit_selector_new (SP_UNIT_ABSOLUTE | SP_UNIT_DEVICE));
        SPDesktop *desktop = SP_ACTIVE_DESKTOP;
        if (desktop)
            sp_unit_selector_set_unit (SP_UNIT_SELECTOR(unit_selector->gobj()), sp_desktop_namedview(desktop)->doc_units);
        unitbox.pack_end(*unit_selector, false, false, 0);
        unitbox.pack_end(units_label, false, false, 3);

        for (int i = 0; i < SELECTION_NUMBER_OF; i++) {
            selectiontype_buttons[i] = new Gtk::RadioButton(_(selection_labels[i]), true);
            if (i > 0) {
                Gtk::RadioButton::Group group = selectiontype_buttons[0]->get_group();
                selectiontype_buttons[i]->set_group(group);
            }
            selectiontype_buttons[i]->set_mode(false);
            togglebox.pack_start(*selectiontype_buttons[i], false, true, 0);
            selectiontype_buttons[i]->signal_clicked().connect(sigc::mem_fun(*this, &Export::onAreaToggled));
        }

        Gtk::Table* t = new Gtk::Table(2, 6, false);
        t->set_row_spacings (4);
        t->set_col_spacings (4);

        x0_adj = createSpinbutton ( "x0", 0.0, -1000000.0, 1000000.0, 0.1, 1.0, unit_selector->gobj(),
                                   GTK_WIDGET(t->gobj()), 0, 0, _("_x0:"), NULL, EXPORT_COORD_PRECISION, 1,
                                   &Export::onAreaX0Change);

        x1_adj = createSpinbutton ( "x1", 0.0, -1000000.0, 1000000.0, 0.1, 1.0, unit_selector->gobj(),
                                   GTK_WIDGET(t->gobj()), 2, 0, _("x_1:"), NULL, EXPORT_COORD_PRECISION, 1,
                                   &Export::onAreaX1Change);

        width_adj = createSpinbutton ( "width", 0.0, 0.0, PNG_UINT_31_MAX, 0.1, 1.0,
                                   unit_selector->gobj(), GTK_WIDGET(t->gobj()), 4, 0, _("Wid_th:"), NULL, EXPORT_COORD_PRECISION, 1,
                                   &Export::onAreaWidthChange);

        y0_adj = createSpinbutton ( "y0", 0.0, -1000000.0, 1000000.0, 0.1, 1.0, unit_selector->gobj(),
                                   GTK_WIDGET(t->gobj()), 0, 1, _("_y0:"), NULL, EXPORT_COORD_PRECISION, 1,
                                   &Export::onAreaY0Change);

        y1_adj = createSpinbutton ( "y1", 0.0, -1000000.0, 1000000.0, 0.1, 1.0, unit_selector->gobj(),
                                   GTK_WIDGET(t->gobj()), 2, 1, _("y_1:"), NULL, EXPORT_COORD_PRECISION, 1,
                                   &Export::onAreaY1Change);

        height_adj = createSpinbutton ( "height", 0.0, 0.0, PNG_UINT_31_MAX, 0.1, 1.0,
                                   unit_selector->gobj(), GTK_WIDGET(t->gobj()), 4, 1, _("Hei_ght:"), NULL, EXPORT_COORD_PRECISION, 1,
                                   &Export::onAreaHeightChange);

        area_box.pack_start(togglebox, false, false, 3);
        area_box.pack_start(*t, false, false, 0);
        area_box.pack_start(unitbox, false, false, 0);

        area_box.set_border_width(3);
        singleexport_box.pack_start(area_box, false, false, 0);

    } // end of area box

    /* Bitmap size frame */
    {
        size_box.set_border_width(3);

#if WITH_GTKMM_2_22
        bm_label = new Gtk::Label(_("<big><b>Bitmap size</b></big>"), Gtk::ALIGN_START);
#else
        bm_label = new Gtk::Label(_("<big><b>Bitmap size</b></big>"), Gtk::ALIGN_LEFT);
#endif
        bm_label->set_use_markup(true);
        size_box.pack_start(*bm_label, false, false, 0);
        Gtk::Table *t = new Gtk::Table(2, 5, false);
        t->set_row_spacings (4);
        t->set_col_spacings (4);
        size_box.pack_start(*t);

        bmwidth_adj = createSpinbutton ( "bmwidth", 16.0, 1.0, 1000000.0, 1.0, 10.0,
                                   NULL, GTK_WIDGET(t->gobj()), 0, 0,
                                   _("_Width:"), _("pixels at"), 0, 1,
                                   &Export::onBitmapWidthChange);

        xdpi_adj = createSpinbutton ( "xdpi",
                                   prefs->getDouble("/dialogs/export/defaultxdpi/value", DPI_BASE),
                                   0.01, 100000.0, 0.1, 1.0, NULL, GTK_WIDGET(t->gobj()), 3, 0,
                                   NULL, _("dp_i"), 2, 1,
                                   &Export::onExportXdpiChange);

        bmheight_adj = createSpinbutton ( "bmheight", 16.0, 1.0, 1000000.0, 1.0, 10.0,
                                   NULL, GTK_WIDGET(t->gobj()), 0, 1,
                                   _("_Height:"), _("pixels at"), 0, 1,
                                   &Export::onBitmapHeightChange);

        /** TODO
         *  There's no way to set ydpi currently, so we use the defaultxdpi value here, too...
         */
        ydpi_adj = createSpinbutton ( "ydpi", prefs->getDouble("/dialogs/export/defaultxdpi/value", DPI_BASE),
                                   0.01, 100000.0, 0.1, 1.0, NULL, GTK_WIDGET(t->gobj()), 3, 1,
                                   NULL, _("dpi"), 2, 0, NULL );

        singleexport_box.pack_start(size_box);
    }

    /* File entry */
    {
        file_box.set_border_width(3);

#if WITH_GTKMM_2_22
        flabel = new Gtk::Label(_("<big><b>_Filename</b></big>"), Gtk::ALIGN_START, Gtk::ALIGN_CENTER, true);
#else
        flabel = new Gtk::Label(_("<big><b>_Filename</b></big>"), Gtk::ALIGN_LEFT, Gtk::ALIGN_CENTER, true);
#endif
        flabel->set_use_markup(true);
        file_box.pack_start(*flabel, false, false, 0);

        set_default_filename();

        filename_box.pack_start (filename_entry, true, true, 0);

        Gtk::HBox* browser_im_label = new Gtk::HBox(false, 3);
        browser_im_label->pack_start(browse_image);
        browser_im_label->pack_start(browse_label);
        browse_button.add(*browser_im_label);
        filename_box.pack_end (browse_button, false, false, 4);

        file_box.add(filename_box);

        original_name = g_strdup(filename_entry.get_text().c_str());

        // focus is in the filename initially:
        filename_entry.grab_focus();

        // mnemonic in frame label moves focus to filename:
        flabel->set_mnemonic_widget(filename_entry);

        singleexport_box.pack_start(file_box);
    }

    batch_export.set_sensitive(true);
    batch_box.pack_start(batch_export, false, false);

    hide_export.set_sensitive(true);
    hide_box.pack_start(hide_export, false, false);

    /* Export Button row */
    button_box.set_border_width(3);
    Gtk::HBox* export_image_label = new Gtk::HBox(false, 3);
    export_image_label->pack_start(export_image);
    export_image_label->pack_start(export_label);

    export_button.add(*export_image_label);
    export_button.set_tooltip_text (_("Export the bitmap file with these settings"));
    button_box.pack_end(export_button, false, false, 0);


    /* Main dialog */
    Gtk::Box *contents = _getContents();
    contents->set_spacing(0);
    contents->pack_start(singleexport_box);
    contents->pack_start(batch_box);
    contents->pack_start(hide_box);
    contents->pack_end(button_box, false, false, 0);

    /* Signal handlers */
    filename_entry.signal_changed().connect( sigc::mem_fun(*this, &Export::onFilenameModified) );
    // pressing enter in the filename field is the same as clicking export:
    filename_entry.signal_activate().connect(sigc::mem_fun(*this, &Export::onExport) );
    browse_button.signal_clicked().connect(sigc::mem_fun(*this, &Export::onBrowse));
    batch_export.signal_clicked().connect(sigc::mem_fun(*this, &Export::onBatchClicked));
    export_button.signal_clicked().connect(sigc::mem_fun(*this, &Export::onExport));

    desktopChangeConn = deskTrack.connectDesktopChanged( sigc::mem_fun(*this, &Export::setTargetDesktop) );
    deskTrack.connect(GTK_WIDGET(gobj()));

    show_all_children();

    findDefaultSelection();
    onAreaToggled();
}

Export::~Export (void)
{
    g_free(original_name);
    original_name = NULL;
    g_free(doc_export_name);
    doc_export_name = NULL;
    was_empty = TRUE;

    selectModifiedConn.disconnect();
    subselChangedConn.disconnect();
    selectChangedConn.disconnect();
    desktopChangeConn.disconnect();
    deskTrack.disconnect();
}

void Export::setDesktop(SPDesktop *desktop)
{
    Panel::setDesktop(desktop);
    deskTrack.setBase(desktop);
}

void Export::setTargetDesktop(SPDesktop *desktop)
{
    if (this->desktop != desktop) {
        if (this->desktop) {
            selectModifiedConn.disconnect();
            subselChangedConn.disconnect();
            selectChangedConn.disconnect();
        }
        this->desktop = desktop;
        if (desktop && desktop->selection) {

            selectChangedConn = desktop->selection->connectChanged(sigc::hide(sigc::mem_fun(*this, &Export::onSelectionChanged)));
            subselChangedConn = desktop->connectToolSubselectionChanged(sigc::hide(sigc::mem_fun(*this, &Export::onSelectionChanged)));

            //// Must check flags, so can't call widget_setup() directly.
            selectModifiedConn = desktop->selection->connectModified(sigc::hide<0>(sigc::mem_fun(*this, &Export::onSelectioModified)));
        }
        //widget_setup();
    }
}

/*
 * set the default filename to be that of the current path + document
 * with .png extension
 *
 * One thing to notice here is that this filename may get
 * overwritten, but it won't happen here.  The filename gets
 * written into the text field, but then the button to select
 * the area gets set.  In that code the filename can be changed
 * if there are some with presidence in the document.  So, while
 * this code sets the name first, it may not be the one users
 * really see.
 */
void Export::set_default_filename () {

    if ( SP_ACTIVE_DOCUMENT && SP_ACTIVE_DOCUMENT->getURI() )
    {
        gchar *name;
        SPDocument * doc = SP_ACTIVE_DOCUMENT;
        const gchar *uri = doc->getURI();
        const gchar *text_extension = get_file_save_extension (Inkscape::Extension::FILE_SAVE_METHOD_SAVE_AS).c_str();
        Inkscape::Extension::Output * oextension = NULL;

        if (text_extension != NULL) {
            oextension = dynamic_cast<Inkscape::Extension::Output *>(Inkscape::Extension::db.get(text_extension));
        }

        if (oextension != NULL) {
            gchar * old_extension = oextension->get_extension();
            if (g_str_has_suffix(uri, old_extension)) {
                gchar * uri_copy;
                gchar * extension_point;
                gchar * final_name;

                uri_copy = g_strdup(uri);
                extension_point = g_strrstr(uri_copy, old_extension);
                extension_point[0] = '\0';

                final_name = g_strconcat(uri_copy, ".png", NULL);
                filename_entry.set_text(final_name);

                g_free(final_name);
                g_free(uri_copy);
            }
        } else {
            name = g_strconcat(uri, ".png", NULL);
            filename_entry.set_text(name);
            g_free(name);
        }

        doc_export_name = g_strdup(filename_entry.get_text().c_str());
    }

}

/**
 * Creates a new spin button for the export dialog.
 * @param  key  The name of the spin button
 * @param  val  A default value for the spin button
 * @param  min  Minimum value for the spin button
 * @param  max  Maximum value for the spin button
 * @param  step The step size for the spin button
 * @param  page Size of the page increment
 * @param  us   Unit selector that effects this spin button
 * @param  t    Table to put the spin button in
 * @param  x    X location in the table \c t to start with
 * @param  y    Y location in the table \c t to start with
 * @param  ll   Text to put on the left side of the spin button (optional)
 * @param  lr   Text to put on the right side of the spin button (optional)
 * @param  digits  Number of digits to display after the decimal
 * @param  sensitive  Whether the spin button is sensitive or not
 * @param  cb   Callback for when this spin button is changed (optional)
 */
Gtk::Adjustment * Export::createSpinbutton( gchar const *key, float val, float min, float max,
                                      float step, float page, GtkWidget *us,
                                      GtkWidget *t, int x, int y,
                                      const gchar *ll, const gchar *lr,
                                      int digits, unsigned int sensitive,
                                      void (Export::*cb)() )
{
    Gtk::Adjustment *adj = new Gtk::Adjustment  ( val, min, max, step, page, 0 );

    if (us) {
        sp_unit_selector_add_adjustment ( SP_UNIT_SELECTOR (us),
                                          GTK_ADJUSTMENT (adj->gobj()) );
    }

    int pos = 0;

    GtkWidget *l = NULL;

    if (ll) {

        l = gtk_label_new_with_mnemonic ((const gchar *)ll);
        gtk_misc_set_alignment (GTK_MISC (l), 1.0, 0.5);
        gtk_table_attach ( GTK_TABLE (t), l, x + pos, x + pos + 1, y, y + 1,
                           (GtkAttachOptions)0, (GtkAttachOptions)0, 0, 0 );
        gtk_widget_set_sensitive (l, sensitive);
        pos += 1;

    }

    GtkWidget *sb = gtk_spin_button_new (GTK_ADJUSTMENT (adj->gobj()), 1.0, digits);
    gtk_table_attach ( GTK_TABLE (t), sb, x + pos, x + pos + 1, y, y + 1,
                       (GtkAttachOptions)0, (GtkAttachOptions)0, 0, 0 );
    gtk_widget_set_size_request (sb, 80, -1);
    gtk_widget_set_sensitive (sb, sensitive);
    pos += 1;

    if (ll) { gtk_label_set_mnemonic_widget (GTK_LABEL(l), sb); }

    if (lr) {

        l = gtk_label_new_with_mnemonic ((const gchar *)lr);
        gtk_misc_set_alignment (GTK_MISC (l), 0.0, 0.5);
        gtk_table_attach ( GTK_TABLE (t), l, x + pos, x + pos + 1, y, y + 1,
                           (GtkAttachOptions)0, (GtkAttachOptions)0, 0, 0 );
        gtk_widget_set_sensitive (l, sensitive);
        pos += 1;

        gtk_label_set_mnemonic_widget (GTK_LABEL(l), sb);
    }

    if (cb) {
        adj->signal_value_changed().connect( sigc::mem_fun(*this, cb) );
    }

    return adj;
} // end of createSpinbutton()


gchar* Export::create_filepath_from_id (const gchar *id, const gchar *file_entry_text) {

    if (id == NULL) /* This should never happen */
        id = "bitmap";

    gchar *directory = NULL;

    if (directory == NULL && file_entry_text != NULL && file_entry_text[0] != '\0') {
        // std::cout << "Directory from dialog" << std::endl;
        directory = g_path_get_dirname(file_entry_text);
    }

    if (directory == NULL) {
        /* Grab document directory */
        if ( SP_ACTIVE_DOCUMENT->getURI() ) {
            // std::cout << "Directory from document" << std::endl;
            directory = g_path_get_dirname( SP_ACTIVE_DOCUMENT->getURI() );
        }
    }

    if (directory == NULL) {
        // std::cout << "Home Directory" << std::endl;
        directory = homedir_path(NULL);
    }

    gchar * id_ext = g_strconcat(id, ".png", NULL);
    gchar *filename = g_build_filename(directory, id_ext, NULL);
    g_free(directory);
    g_free(id_ext);
    return filename;
}

void
Export::onBatchClicked ()
{
    if (batch_export.get_active()) {
        singleexport_box.set_sensitive(false);
    } else {
        singleexport_box.set_sensitive(true);
    }
}

void Export::updateCheckbuttons ()
{
    gint num = g_slist_length((GSList *) sp_desktop_selection(SP_ACTIVE_DESKTOP)->itemList());
    if (num >= 2) {
        batch_export.set_sensitive(true);
        batch_export.set_label(g_strdup_printf (ngettext("B_atch export %d selected object","B_atch export %d selected objects",num), num));
    } else {
        batch_export.set_active (false);
        batch_export.set_sensitive(false);
    }
    if (num > 0) {
        hide_export.set_sensitive(true);
    } else {
        hide_export.set_sensitive(false);
    }
}

inline void
Export::findDefaultSelection()
{
    selection_type key = SELECTION_NUMBER_OF;

    if ((sp_desktop_selection(SP_ACTIVE_DESKTOP))->isEmpty() == false) {
        key = SELECTION_SELECTION;
    }

    /* Try using the preferences */
    if (key == SELECTION_NUMBER_OF) {

        int i = SELECTION_NUMBER_OF;

        Glib::ustring what = prefs->getString("/dialogs/export/exportarea/value");

        if (!what.empty()) {
            for (i = 0; i < SELECTION_NUMBER_OF; i++) {
                if (what == selection_names[i]) {
                    break;
                }
            }
        }

        key = (selection_type)i;
    }

    if (key == SELECTION_NUMBER_OF) {
        key = SELECTION_SELECTION;
    }

    current_key = key;
    selectiontype_buttons[current_key]->set_active(true);
    updateCheckbuttons ();
}


/**
 * If selection changed or a different document activated, we must
 * recalculate any chosen areas.
 */
void Export::onSelectionChanged()
{
    Inkscape::Selection *selection = sp_desktop_selection (SP_ACTIVE_DESKTOP);

    if ((current_key == SELECTION_DRAWING || current_key == SELECTION_PAGE) &&
            (sp_desktop_selection(SP_ACTIVE_DESKTOP))->isEmpty() == false &&
            was_empty) {
        current_key = SELECTION_SELECTION;
        selectiontype_buttons[current_key]->set_active(true);
    }
    was_empty = (sp_desktop_selection(SP_ACTIVE_DESKTOP))->isEmpty();

    if ( selection &&
            SELECTION_CUSTOM != current_key) {
        onAreaToggled();
    }

    updateCheckbuttons ();
}

void Export::onSelectioModified ( guint flags )
{
    switch (current_key) {
        case SELECTION_DRAWING:
            if ( SP_ACTIVE_DESKTOP ) {
                SPDocument *doc;
                doc = sp_desktop_document (SP_ACTIVE_DESKTOP);
                Geom::OptRect bbox = doc->getRoot()->desktopVisualBounds();
                if (bbox) {
                    setArea ( bbox->left(),
                                              bbox->top(),
                                              bbox->right(),
                                              bbox->bottom());
                }
            }
            break;
        case SELECTION_SELECTION:
            if ((sp_desktop_selection(SP_ACTIVE_DESKTOP))->isEmpty() == false) {
                Geom::OptRect bbox = (sp_desktop_selection (SP_ACTIVE_DESKTOP))->visualBounds();
                setArea ( bbox->left(),
                                          bbox->top(),
                                          bbox->right(),
                                          bbox->bottom());
            }
            break;
        default:
            /* Do nothing for page or for custom */
            break;
    }

    return;
}

/// Called when one of the selection buttons was toggled.
void Export::onAreaToggled ()
{
    if (update) {
        return;
    }

    /* Find which button is active */
    selection_type key = current_key;
    for (int i = 0; i < SELECTION_NUMBER_OF; i++) {
        if (selectiontype_buttons[i]->get_active()) {
            key = (selection_type)i;
        }
    }

    if ( SP_ACTIVE_DESKTOP )
    {
        SPDocument *doc;
        Geom::OptRect bbox;
        bbox = Geom::Rect(Geom::Point(0.0, 0.0),Geom::Point(0.0, 0.0));
        doc = sp_desktop_document (SP_ACTIVE_DESKTOP);

        /* Notice how the switch is used to 'fall through' here to get
           various backups.  If you modify this without noticing you'll
           probabaly screw something up. */
        switch (key) {
            case SELECTION_SELECTION:
                if ((sp_desktop_selection(SP_ACTIVE_DESKTOP))->isEmpty() == false)
                {
                    bbox = sp_desktop_selection (SP_ACTIVE_DESKTOP)->visualBounds();
                    /* Only if there is a selection that we can set
                       do we break, otherwise we fall through to the
                       drawing */
                    // std::cout << "Using selection: SELECTION" << std::endl;
                    key = SELECTION_SELECTION;
                    break;
                }
            case SELECTION_DRAWING:
                /** \todo
                 * This returns wrong values if the document has a viewBox.
                 */
                bbox = doc->getRoot()->desktopVisualBounds();
                /* If the drawing is valid, then we'll use it and break
                   otherwise we drop through to the page settings */
                if (bbox) {
                    // std::cout << "Using selection: DRAWING" << std::endl;
                    key = SELECTION_DRAWING;
                    break;
                }
            case SELECTION_PAGE:
                bbox = Geom::Rect(Geom::Point(0.0, 0.0),
                                  Geom::Point(doc->getWidth(), doc->getHeight()));

                // std::cout << "Using selection: PAGE" << std::endl;
                key = SELECTION_PAGE;
                break;
            case SELECTION_CUSTOM:
            default:
                break;
        } // switch

        current_key = key;

        // remember area setting
        prefs->setString("/dialogs/export/exportarea/value", selection_names[current_key]);

        if ( key != SELECTION_CUSTOM && bbox ) {
            setArea ( bbox->min()[Geom::X],
                                      bbox->min()[Geom::Y],
                                      bbox->max()[Geom::X],
                                      bbox->max()[Geom::Y]);
        }

    } // end of if ( SP_ACTIVE_DESKTOP )

    if (SP_ACTIVE_DESKTOP && !filename_modified) {

        const gchar * filename = NULL;
        float xdpi = 0.0, ydpi = 0.0;

        switch (key) {
            case SELECTION_PAGE:
            case SELECTION_DRAWING: {
                SPDocument * doc = SP_ACTIVE_DOCUMENT;
                sp_document_get_export_hints (doc, &filename, &xdpi, &ydpi);

                if (filename == NULL) {
                    if (doc_export_name != NULL) {
                        filename = g_strdup(doc_export_name);
                    } else {
                        filename = g_strdup("");
                    }
                }
                break;
            }
            case SELECTION_SELECTION:
                if ((sp_desktop_selection(SP_ACTIVE_DESKTOP))->isEmpty() == false) {

                    sp_selection_get_export_hints (sp_desktop_selection(SP_ACTIVE_DESKTOP), &filename, &xdpi, &ydpi);

                    /* If we still don't have a filename -- let's build
                       one that's nice */
                    if (filename == NULL) {
                        const gchar * id = NULL;
                        const GSList * reprlst = sp_desktop_selection(SP_ACTIVE_DESKTOP)->reprList();
                        for(; reprlst != NULL; reprlst = reprlst->next) {
                            Inkscape::XML::Node * repr = (Inkscape::XML::Node *)reprlst->data;
                            if (repr->attribute("id")) {
                                id = repr->attribute("id");
                                break;
                            }
                        }

                        filename = create_filepath_from_id (id, filename_entry.get_text().c_str());
                    }
                }
                break;
            case SELECTION_CUSTOM:
            default:
                break;
        }

        if (filename != NULL) {
            g_free(original_name);
            original_name = g_strdup(filename);
            filename_entry.set_text(filename);
        }

        if (xdpi != 0.0) {
            setValue(xdpi_adj, xdpi);
        }

        /* These can't be separate, and setting x sets y, so for
           now setting this is disabled.  Hopefully it won't be in
           the future */
        if (FALSE && ydpi != 0.0) {
            setValue(ydpi_adj, ydpi);
        }
    }

    return;
} // end of sp_export_area_toggled()

/// Called when dialog is deleted

gint Export::onProgressDelete ( GtkWidget *widget, GdkEvent *event, GObject *base )
{
    g_object_set_data (base, "cancel", (gpointer) 1);
    return TRUE;
} // end of sp_export_progress_delete()


/// Called when progress is cancelled
void Export::onProgressCancel ( GtkWidget *widget, GObject *base )
{
    g_object_set_data (base, "cancel", (gpointer) 1);
} // end of sp_export_progress_cancel()


/// Called for every progress iteration
unsigned int Export::onProgressCallback (float value, void *data)
{
    GtkWidget *prg;
    int evtcount;

    if (g_object_get_data ((GObject *) data, "cancel"))
        return FALSE;

    prg = (GtkWidget *) g_object_get_data ((GObject *) data, "progress");
    gtk_progress_bar_set_fraction ((GtkProgressBar *) prg, value);

    evtcount = 0;
    while ((evtcount < 16) && gdk_events_pending ()) {
            gtk_main_iteration_do (FALSE);
            evtcount += 1;
    }

    gtk_main_iteration_do (FALSE);

    return TRUE;

} // end of sp_export_progress_callback()

GtkWidget * Export::create_progress_dialog (gchar *progress_text) {

    GtkWidget *dlg, *prg, *btn; /* progressbar dlg widgets */

    dlg = gtk_dialog_new ();

    GtkObject *base  = GTK_OBJECT(dlg);

    gtk_window_set_title (GTK_WINDOW (dlg), _("Export in progress"));
    prg = gtk_progress_bar_new ();
    //sp_transientize (dlg);
    gtk_window_set_resizable (GTK_WINDOW (dlg), FALSE);
    g_object_set_data ((GObject *) base, "progress", prg);

    gtk_progress_bar_set_text ((GtkProgressBar *) prg, progress_text);

    gtk_progress_bar_set_orientation ( (GtkProgressBar *) prg,
                                       GTK_PROGRESS_LEFT_TO_RIGHT);
    gtk_box_pack_start ((GtkBox *) gtk_dialog_get_content_area((GtkDialog *) dlg),
                        prg, FALSE, FALSE, 4 );
    btn = gtk_dialog_add_button ( GTK_DIALOG (dlg),
                                  GTK_STOCK_CANCEL,
                                  GTK_RESPONSE_CANCEL );

    g_signal_connect ( (GObject *) dlg, "delete_event",
                       (GCallback) onProgressDelete, base);
    g_signal_connect ( (GObject *) btn, "clicked",
                       (GCallback) onProgressCancel, base);
    gtk_window_set_modal ((GtkWindow *) dlg, TRUE);
    gtk_widget_show_all (dlg);

    return dlg;
}

// FIXME: Some lib function should be available to do this ...
gchar * Export::filename_add_extension (const gchar *filename, const gchar *extension)
{
  const gchar *dot;

  dot = strrchr (filename, '.');
  if ( !dot )
    return g_strconcat (filename, ".", extension, NULL);
  {
    if (dot[1] == '\0')
      return g_strconcat (filename, extension, NULL);
    else
    {
      if (g_ascii_strcasecmp (dot + 1, extension) == 0)
        return g_strdup (filename);
      else
      {
        return g_strconcat (filename, ".", extension, NULL);
      }
    }
  }
}

gchar *Export::absolutize_path_from_document_location (SPDocument *doc, const gchar *filename)
{
    gchar *path = 0;
    //Make relative paths go from the document location, if possible:
    if (!g_path_is_absolute(filename) && doc->getURI()) {
        gchar *dirname = g_path_get_dirname(doc->getURI());
        if (dirname) {
            path = g_build_filename(dirname, filename, NULL);
            g_free(dirname);
        }
    }
    if (!path) {
        path = g_strdup(filename);
    }
    return path;
}

/// Called when export button is clicked
void Export::onExport ()
{
    if (!SP_ACTIVE_DESKTOP) return;

    SPNamedView *nv = sp_desktop_namedview(SP_ACTIVE_DESKTOP);
    SPDocument *doc = sp_desktop_document (SP_ACTIVE_DESKTOP);

    bool hide = hide_export.get_active ();
    if (batch_export.get_active ()) {
        // Batch export of selected objects

        gint num = g_slist_length((GSList *) sp_desktop_selection(SP_ACTIVE_DESKTOP)->itemList());
        gint n = 0;

        if (num < 1)
            return;

        gchar *progress_text = g_strdup_printf (_("Exporting %d files"), num);
        GtkWidget *prog_dlg = create_progress_dialog (progress_text);
        g_free (progress_text);

        for (GSList *i = (GSList *) sp_desktop_selection(SP_ACTIVE_DESKTOP)->itemList();
             i != NULL;
             i = i->next) {
            SPItem *item = reinterpret_cast<SPItem *>(i->data);

            // retrieve export filename hint
            const gchar *filename = item->getRepr()->attribute("inkscape:export-filename");
            gchar *path = 0;
            if (!filename) {
                path = create_filepath_from_id(item->getId(), NULL);
            } else {
                path = absolutize_path_from_document_location(doc, filename);
            }

            // retrieve export dpi hints
            const gchar *dpi_hint = item->getRepr()->attribute("inkscape:export-xdpi"); // only xdpi, ydpi is always the same now
            gdouble dpi = 0.0;
            if (dpi_hint) {
                dpi = atof(dpi_hint);
            }
            if (dpi == 0.0) {
                dpi = DPI_BASE;
            }

            Geom::OptRect area = item->desktopVisualBounds();
            if (area) {
                gint width = (gint) (area->width() * dpi / PX_PER_IN + 0.5);
                gint height = (gint) (area->height() * dpi / PX_PER_IN + 0.5);

                if (width > 1 && height > 1) {
                    /* Do export */
                    if (!sp_export_png_file (doc, path,
                                             *area, width, height, dpi, dpi,
                                             nv->pagecolor,
                                             NULL, NULL, TRUE,  // overwrite without asking
                                             hide ? (GSList *) sp_desktop_selection(SP_ACTIVE_DESKTOP)->itemList() : NULL
                            )) {
                        gchar * error;
                        gchar * safeFile = Inkscape::IO::sanitizeString(path);
                        error = g_strdup_printf(_("Could not export to filename %s.\n"), safeFile);
                        sp_ui_error_dialog(error);
                        g_free(safeFile);
                        g_free(error);
                    }
                }
            }
            n++;
            g_free(path);
            onProgressCallback((float)n/num, prog_dlg);
        }

        gtk_widget_destroy (prog_dlg);
        //g_object_set_data (G_OBJECT (base), "cancel", (gpointer) 0);

    } else {

    gchar const *filename = g_strdup(filename_entry.get_text().c_str());

    float const x0 = getValuePx(x0_adj);
    float const y0 = getValuePx(y0_adj);
    float const x1 = getValuePx(x1_adj);
    float const y1 = getValuePx(y1_adj);
    float const xdpi = getValue(xdpi_adj);
    float const ydpi = getValue(ydpi_adj);
    unsigned long int const width = int(getValue(bmwidth_adj) + 0.5);
    unsigned long int const height = int(getValue(bmheight_adj) + 0.5);

    if (filename == NULL || *filename == '\0') {
        sp_ui_error_dialog(_("You have to enter a filename"));
        return;
    }

    if (!((x1 > x0) && (y1 > y0) && (width > 0) && (height > 0))) {
        sp_ui_error_dialog (_("The chosen area to be exported is invalid"));
        return;
    }

    // make sure that .png is the extension of the file:
    gchar * filename_ext = filename_add_extension(filename, "png");
    //gtk_entry_set_text(GTK_ENTRY(filename_entry), filename_ext);
    filename_entry.set_text(filename_ext);

    gchar *path = absolutize_path_from_document_location(doc, filename_ext);

    gchar *dirname = g_path_get_dirname(path);
    if ( dirname == NULL
         || !Inkscape::IO::file_test(dirname, (GFileTest)(G_FILE_TEST_EXISTS | G_FILE_TEST_IS_DIR)) )
    {
        gchar *safeDir = Inkscape::IO::sanitizeString(dirname);
        gchar *error = g_strdup_printf(_("Directory %s does not exist or is not a directory.\n"),
                                       safeDir);
        sp_ui_error_dialog(error);
        g_free(safeDir);
        g_free(error);
        g_free(dirname);
        g_free(path);
        return;
    }
    g_free(dirname);

    gchar *fn = g_path_get_basename (path);
    gchar *progress_text = g_strdup_printf (_("Exporting %s (%lu x %lu)"), fn, width, height);
    g_free (fn);

    GtkWidget *prog_dlg = create_progress_dialog (progress_text);
    g_free (progress_text);

    /* Do export */
    if (!sp_export_png_file (sp_desktop_document (SP_ACTIVE_DESKTOP), path,
                             Geom::Rect(Geom::Point(x0, y0), Geom::Point(x1, y1)), width, height, xdpi, ydpi,
                             nv->pagecolor,
                             onProgressCallback, prog_dlg, FALSE,
                             hide ? (GSList *) sp_desktop_selection(SP_ACTIVE_DESKTOP)->itemList() : NULL
            )) {
        gchar * error;
        gchar * safeFile = Inkscape::IO::sanitizeString(path);
        error = g_strdup_printf(_("Could not export to filename %s.\n"), safeFile);
        sp_ui_error_dialog(error);
        g_free(safeFile);
        g_free(error);
    }

    /* Reset the filename so that it can be changed again by changing
       selections and all that */
    g_free(original_name);
    original_name = g_strdup(filename_ext);
    filename_modified = false;

    gtk_widget_destroy (prog_dlg);
    //g_object_set_data (G_OBJECT (base), "cancel", (gpointer) 0);

    /* Setup the values in the document */
    switch (current_key) {
        case SELECTION_PAGE:
        case SELECTION_DRAWING: {
            SPDocument * doc = SP_ACTIVE_DOCUMENT;
            Inkscape::XML::Node * repr = doc->getReprRoot();
            bool modified = false;

            bool saved = DocumentUndo::getUndoSensitive(doc);
            DocumentUndo::setUndoSensitive(doc, false);

            gchar const *temp_string = repr->attribute("inkscape:export-filename");
            if (temp_string == NULL || strcmp(temp_string, filename_ext)) {
                repr->setAttribute("inkscape:export-filename", filename_ext);
                modified = true;
            }
            temp_string = repr->attribute("inkscape:export-xdpi");
            if (temp_string == NULL || xdpi != atof(temp_string)) {
                sp_repr_set_svg_double(repr, "inkscape:export-xdpi", xdpi);
                modified = true;
            }
            temp_string = repr->attribute("inkscape:export-ydpi");
            if (temp_string == NULL || xdpi != atof(temp_string)) {
                sp_repr_set_svg_double(repr, "inkscape:export-ydpi", ydpi);
                modified = true;
            }
            DocumentUndo::setUndoSensitive(doc, saved);

            if (modified) {
                doc->setModifiedSinceSave();
            }
            break;
        }
        case SELECTION_SELECTION: {
            const GSList * reprlst;
            SPDocument * doc = SP_ACTIVE_DOCUMENT;
            bool modified = false;

            bool saved = DocumentUndo::getUndoSensitive(doc);
            DocumentUndo::setUndoSensitive(doc, false);
            reprlst = sp_desktop_selection(SP_ACTIVE_DESKTOP)->reprList();

            for(; reprlst != NULL; reprlst = reprlst->next) {
                Inkscape::XML::Node * repr = (Inkscape::XML::Node *)reprlst->data;
                const gchar * temp_string;
                gchar *dir = g_path_get_dirname(filename);
                gchar *docdir = g_path_get_dirname(SP_ACTIVE_DOCUMENT->getURI());

                if (repr->attribute("id") == NULL ||
                        !(g_strrstr(filename_ext, repr->attribute("id")) != NULL &&
                          ( !SP_ACTIVE_DOCUMENT->getURI() ||
                            strcmp(dir, docdir) == 0))) {
                    temp_string = repr->attribute("inkscape:export-filename");
                    if (temp_string == NULL || strcmp(temp_string, filename_ext)) {
                        repr->setAttribute("inkscape:export-filename", filename_ext);
                        modified = true;
                    }
                }
                temp_string = repr->attribute("inkscape:export-xdpi");
                if (temp_string == NULL || xdpi != atof(temp_string)) {
                    sp_repr_set_svg_double(repr, "inkscape:export-xdpi", xdpi);
                    modified = true;
                }
                temp_string = repr->attribute("inkscape:export-ydpi");
                if (temp_string == NULL || xdpi != atof(temp_string)) {
                    sp_repr_set_svg_double(repr, "inkscape:export-ydpi", ydpi);
                    modified = true;
                }
                g_free(dir);
                g_free(docdir);
            }
            DocumentUndo::setUndoSensitive(doc, saved);

            if (modified) {
                doc->setModifiedSinceSave();
            }
            break;
        }
        default:
            break;
    }

    g_free (filename_ext);
    g_free (path);

    }

} // end of sp_export_export_clicked()

/// Called when Browse button is clicked
/// @todo refactor this code to use ui/dialogs/filedialog.cpp
void Export::onBrowse ()
{
    GtkWidget *fs;
    const gchar *filename;

    fs = gtk_file_chooser_dialog_new (_("Select a filename for exporting"),
                                      (GtkWindow*)desktop->getToplevel(),
                                      GTK_FILE_CHOOSER_ACTION_SAVE,
                                      GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
                                      GTK_STOCK_SAVE, GTK_RESPONSE_ACCEPT,
                                      NULL );

#ifdef WITH_GNOME_VFS
    if (gnome_vfs_initialized()) {
        gtk_file_chooser_set_local_only(GTK_FILE_CHOOSER(fs), false);
    }
#endif

    sp_transientize (fs);

    gtk_window_set_modal(GTK_WINDOW (fs), true);

    filename = filename_entry.get_text().c_str();

    if (*filename == '\0') {
        filename = create_filepath_from_id(NULL, NULL);
    }

    gtk_file_chooser_set_filename (GTK_FILE_CHOOSER (fs), filename);

#ifdef WIN32
    // code in this section is borrowed from ui/dialogs/filedialogimpl-win32.cpp
    OPENFILENAMEW opf;
    WCHAR filter_string[20];
    wcsncpy(filter_string, L"PNG#*.png##", 11);
    filter_string[3] = L'\0';
    filter_string[9] = L'\0';
    filter_string[10] = L'\0';
    WCHAR* title_string = (WCHAR*)g_utf8_to_utf16(_("Select a filename for exporting"), -1, NULL, NULL, NULL);
    WCHAR* extension_string = (WCHAR*)g_utf8_to_utf16("*.png", -1, NULL, NULL, NULL);
    // Copy the selected file name, converting from UTF-8 to UTF-16
    WCHAR _filename[_MAX_PATH + 1];
    memset(_filename, 0, sizeof(_filename));
    gunichar2* utf16_path_string = g_utf8_to_utf16(filename, -1, NULL, NULL, NULL);
    wcsncpy(_filename, (wchar_t*)utf16_path_string, _MAX_PATH);
    g_free(utf16_path_string);

    opf.hwndOwner = (HWND)(GDK_WINDOW_HWND(gtk_widget_get_window(GTK_WIDGET(this))));
    opf.lpstrFilter = filter_string;
    opf.lpstrCustomFilter = 0;
    opf.nMaxCustFilter = 0L;
    opf.nFilterIndex = 1L;
    opf.lpstrFile = _filename;
    opf.nMaxFile = _MAX_PATH;
    opf.lpstrFileTitle = NULL;
    opf.nMaxFileTitle=0;
    opf.lpstrInitialDir = 0;
    opf.lpstrTitle = title_string;
    opf.nFileOffset = 0;
    opf.nFileExtension = 2;
    opf.lpstrDefExt = extension_string;
    opf.lpfnHook = NULL;
    opf.lCustData = 0;
    opf.Flags = OFN_PATHMUSTEXIST;
    opf.lStructSize = sizeof(OPENFILENAMEW);
    if (GetSaveFileNameW(&opf) != 0)
    {
        // Copy the selected file name, converting from UTF-16 to UTF-8
        gchar *utf8string = g_utf16_to_utf8((const gunichar2*)opf.lpstrFile, _MAX_PATH, NULL, NULL, NULL);
        filename_entry.set_text(utf8string);
        g_free(utf8string);

    }
    g_free(extension_string);
    g_free(title_string);

#else
    if (gtk_dialog_run (GTK_DIALOG (fs)) == GTK_RESPONSE_ACCEPT)
    {
        gchar *file;

        file = gtk_file_chooser_get_filename (GTK_FILE_CHOOSER (fs));

        gchar * utf8file = g_filename_to_utf8( file, -1, NULL, NULL, NULL );
        filename_entry.set_text (utf8file);

        g_free(utf8file);
        g_free(file);
    }
#endif

    gtk_widget_destroy (fs);

    return;
} // end of sp_export_browse_clicked()

// TODO: Move this to nr-rect-fns.h.
bool Export::bbox_equal(Geom::Rect const &one, Geom::Rect const &two)
{
    double const epsilon = pow(10.0, -EXPORT_COORD_PRECISION);
    return (
        (fabs(one.min()[Geom::X] - two.min()[Geom::X]) < epsilon) &&
        (fabs(one.min()[Geom::Y] - two.min()[Geom::Y]) < epsilon) &&
        (fabs(one.max()[Geom::X] - two.max()[Geom::X]) < epsilon) &&
        (fabs(one.max()[Geom::Y] - two.max()[Geom::Y]) < epsilon)
        );
}

/**
 *This function is used to detect the current selection setting
 * based on the values in the x0, y0, x1 and y0 fields.
 *
 * One of the most confusing parts of this function is why the array
 * is built at the beginning.  What needs to happen here is that we
 * should always check the current selection to see if it is the valid
 * one.  While this is a performance improvement it is also a usability
 * one during the cases where things like selections and drawings match
 * size.  This way buttons change less 'randomly' (atleast in the eyes
 * of the user).  To do this an array is built where the current selection
 * type is placed first, and then the others in an order from smallest
 * to largest (this can be configured by reshuffling \c test_order).
 *
 * All of the values in this function are rounded to two decimal places
 * because that is what is shown to the user.  While everything is kept
 * more accurate than that, the user can't control more acurrate than
 * that, so for this to work for them - it needs to check on that level
 * of accuracy.
 *
 * @todo finish writing this up.
 */
void Export::detectSize() {
    static const selection_type test_order[SELECTION_NUMBER_OF] = {SELECTION_SELECTION, SELECTION_DRAWING, SELECTION_PAGE, SELECTION_CUSTOM};
    selection_type this_test[SELECTION_NUMBER_OF + 1];
    selection_type key = SELECTION_NUMBER_OF;
    
    Geom::Point x(getValuePx(x0_adj),
                  getValuePx(y0_adj));
    Geom::Point y(getValuePx(x1_adj),
                  getValuePx(y1_adj));
    Geom::Rect current_bbox(x, y);

    this_test[0] = current_key;
    for (int i = 0; i < SELECTION_NUMBER_OF; i++) {
        this_test[i + 1] = test_order[i];
    }

    for (int i = 0;
            i < SELECTION_NUMBER_OF + 1 &&
                key == SELECTION_NUMBER_OF &&
                SP_ACTIVE_DESKTOP != NULL;
            i++) {
        switch (this_test[i]) {
            case SELECTION_SELECTION:
                if ((sp_desktop_selection(SP_ACTIVE_DESKTOP))->isEmpty() == false) {
                    Geom::OptRect bbox = (sp_desktop_selection (SP_ACTIVE_DESKTOP))->bounds(SPItem::VISUAL_BBOX);

                    if ( bbox && bbox_equal(*bbox,current_bbox)) {
                        key = SELECTION_SELECTION;
                    }
                }
                break;
            case SELECTION_DRAWING: {
                SPDocument *doc = sp_desktop_document (SP_ACTIVE_DESKTOP);

                Geom::OptRect bbox = doc->getRoot()->desktopVisualBounds();

                if ( bbox && bbox_equal(*bbox,current_bbox) ) {
                    key = SELECTION_DRAWING;
                }
                break;
            }

            case SELECTION_PAGE: {
                SPDocument *doc;

                doc = sp_desktop_document (SP_ACTIVE_DESKTOP);

                Geom::Point x(0.0, 0.0);
                Geom::Point y(doc->getWidth(),
                              doc->getHeight());
                Geom::Rect bbox(x, y);

                if (bbox_equal(bbox,current_bbox)) {
                    key = SELECTION_PAGE;
                }

                break;
           }
        default:
           break;
        }
    }
    // std::cout << std::endl;

    if (key == SELECTION_NUMBER_OF) {
        key = SELECTION_CUSTOM;
    }

    current_key = key;
    selectiontype_buttons[current_key]->set_active(true);

    return;
} /* sp_export_detect_size */

/// Called when area x0 value is changed
void Export::areaXChange (Gtk::Adjustment *adj)
{
    float x0, x1, xdpi, width;

    if (update) {
        return;
    }

    if (sp_unit_selector_update_test ((SPUnitSelector *)unit_selector->gobj())) {
        return;
    }

    update = true;

    x0 = getValuePx(x0_adj);
    x1 = getValuePx(x1_adj);
    xdpi = getValue(xdpi_adj);

    width = floor ((x1 - x0) * xdpi / DPI_BASE + 0.5);

    if (width < SP_EXPORT_MIN_SIZE) {
        width = SP_EXPORT_MIN_SIZE;

        if (adj == x1_adj) {
            x1 = x0 + width * DPI_BASE / xdpi;
            setValuePx(x1_adj, x1);
        } else {
            x0 = x1 - width * DPI_BASE / xdpi;
            setValuePx(x0_adj, x0);
        }
    }

    setValuePx(width_adj, x1 - x0);
    setValue(bmwidth_adj, width);

    detectSize();

    update = false;

    return;
} // end of sp_export_area_x_value_changed()

/// Called when area y0 value is changed.
void Export::areaYChange (Gtk::Adjustment *adj)
{
    float y0, y1, ydpi, height;

    if (update) {
        return;
    }

    if (sp_unit_selector_update_test ((SPUnitSelector *)unit_selector->gobj()))  {
        return;
    }

    update = true;

    y0 = getValuePx(y0_adj);
    y1 = getValuePx(y1_adj);
    ydpi = getValue(ydpi_adj);

    height = floor ((y1 - y0) * ydpi / DPI_BASE + 0.5);

    if (height < SP_EXPORT_MIN_SIZE) {
        //const gchar *key;
        height = SP_EXPORT_MIN_SIZE;
        //key = (const gchar *)g_object_get_data(G_OBJECT (adj), "key");
        if (adj == y1_adj) {
        //if (!strcmp (key, "y0")) {
            y1 = y0 + height * DPI_BASE / ydpi;
            setValuePx(y1_adj, y1);
        } else {
            y0 = y1 - height * DPI_BASE / ydpi;
            setValuePx(y0_adj, y0);
        }
    }

    setValuePx(height_adj, y1 - y0);
    setValue(bmheight_adj, height);

    detectSize();

    update = false;

    return;
} // end of sp_export_area_y_value_changed()

/// Called when x1-x0 or area width is changed
void Export::onAreaWidthChange()
{
    if (update) {
        return;
    }

    if (sp_unit_selector_update_test(reinterpret_cast<SPUnitSelector *>(unit_selector->gobj()))) {
        return;
    }

    update = true;

    float x0 = getValuePx(x0_adj);
    float xdpi = getValue(xdpi_adj);
    float width = getValuePx(width_adj);
    float bmwidth = floor(width * xdpi / DPI_BASE + 0.5);

    if (bmwidth < SP_EXPORT_MIN_SIZE) {

        bmwidth = SP_EXPORT_MIN_SIZE;
        width = bmwidth * DPI_BASE / xdpi;
        setValuePx(width_adj, width);
    }

    setValuePx(x1_adj, x0 + width);
    setValue(bmwidth_adj, bmwidth);

    update = false;

    return;
} // end of sp_export_area_width_value_changed()

/// Called when y1-y0 or area height is changed.
void Export::onAreaHeightChange()
{
    if (update) {
        return;
    }

    if (sp_unit_selector_update_test(reinterpret_cast<SPUnitSelector *>(unit_selector->gobj()))) {
        return;
    }

    update = true;

    float y0 = getValuePx(y0_adj);
    //float y1 = sp_export_value_get_px(y1_adj);
    float ydpi = getValue(ydpi_adj);
    float height = getValuePx(height_adj);
    float bmheight = floor (height * ydpi / DPI_BASE + 0.5);

    if (bmheight < SP_EXPORT_MIN_SIZE) {
        bmheight = SP_EXPORT_MIN_SIZE;
        height = bmheight * DPI_BASE / ydpi;
        setValuePx(height_adj, height);
    }

    setValuePx(y1_adj, y0 + height);
    setValue(bmheight_adj, bmheight);

    update = false;

    return;
} // end of sp_export_area_height_value_changed()

/**
 * A function to set the ydpi.
 * @param base The export dialog.
 *
 * This function grabs all of the y values and then figures out the
 * new bitmap size based on the changing dpi value.  The dpi value is
 * gotten from the xdpi setting as these can not currently be independent.
 */
void Export::setImageY()
{
    float y0, y1, xdpi;

    y0 = getValuePx(y0_adj);
    y1 = getValuePx(y1_adj);
    xdpi = getValue(xdpi_adj);

    setValue(ydpi_adj, xdpi);
    setValue(bmheight_adj, (y1 - y0) * xdpi / DPI_BASE);

    return;
} // end of setImageY()

/**
 * A function to set the xdpi.
 *
 * This function grabs all of the x values and then figures out the
 * new bitmap size based on the changing dpi value.  The dpi value is
 * gotten from the xdpi setting as these can not currently be independent.
 *
 */
void Export::setImageX()
{
    float x0, x1, xdpi;

    x0 = getValuePx(x0_adj);
    x1 = getValuePx(x1_adj);
    xdpi = getValue(xdpi_adj);

    setValue(ydpi_adj, xdpi);
    setValue(bmwidth_adj, (x1 - x0) * xdpi / DPI_BASE);

    return;
} // end of setImageX()

/// Called when pixel width is changed
void Export::onBitmapWidthChange ()
{
    float x0, x1, bmwidth, xdpi;

    if (update) {
        return;
    }

    if (sp_unit_selector_update_test ((SPUnitSelector *)unit_selector->gobj())) {
       return;
    }

    update = true;

    x0 = getValuePx(x0_adj);
    x1 = getValuePx(x1_adj);
    bmwidth = getValue(bmwidth_adj);

    if (bmwidth < SP_EXPORT_MIN_SIZE) {
        bmwidth = SP_EXPORT_MIN_SIZE;
        setValue(bmwidth_adj, bmwidth);
    }

    xdpi = bmwidth * DPI_BASE / (x1 - x0);
    setValue(xdpi_adj, xdpi);

    setImageY ();

    update = false;

    return;
} // end of sp_export_bitmap_width_value_changed()

/// Called when pixel height is changed
void Export::onBitmapHeightChange ()
{
    float y0, y1, bmheight, xdpi;

    if (update) {
        return;
    }

    if (sp_unit_selector_update_test ((SPUnitSelector *)unit_selector->gobj())) {
       return;
    }

    update = true;

    y0 = getValuePx(y0_adj);
    y1 = getValuePx(y1_adj);
    bmheight = getValue(bmheight_adj);

    if (bmheight < SP_EXPORT_MIN_SIZE) {
        bmheight = SP_EXPORT_MIN_SIZE;
        setValue(bmheight_adj, bmheight);
    }

    xdpi = bmheight * DPI_BASE / (y1 - y0);
    setValue(xdpi_adj, xdpi);

    setImageX ();

    update = false;

    return;
} // end of sp_export_bitmap_width_value_changed()

/**
 * A function to adjust the bitmap width when the xdpi value changes.
 *
 * The first thing this function checks is to see if we are doing an
 * update.  If we are, this function just returns because there is another
 * instance of it that will handle everything for us.  If there is a
 * units change, we also assume that everyone is being updated appropriately
 * and there is nothing for us to do.
 *
 * If we're the highest level function, we set the update flag, and
 * continue on our way.
 *
 * All of the values are grabbed using the \c sp_export_value_get functions
 * (call to the _pt ones for x0 and x1 but just standard for xdpi).  The
 * xdpi value is saved in the preferences for the next time the dialog
 * is opened.  (does the selection dpi need to be set here?)
 *
 * A check is done to to ensure that we aren't outputing an invalid width,
 * this is set by SP_EXPORT_MIN_SIZE.  If that is the case the dpi is
 * changed to make it valid.
 *
 * After all of this the bitmap width is changed.
 *
 * We also change the ydpi.  This is a temporary hack as these can not
 * currently be independent.  This is likely to change in the future.
 *
 */
void Export::onExportXdpiChange()
{
    float x0, x1, xdpi, bmwidth;

    if (update) {
        return;
    }

    if (sp_unit_selector_update_test ((SPUnitSelector *)unit_selector->gobj())) {
       return;
    }

    update = true;

    x0 = getValuePx(x0_adj);
    x1 = getValuePx(x1_adj);
    xdpi = getValue(xdpi_adj);

    // remember xdpi setting
    prefs->setDouble("/dialogs/export/defaultxdpi/value", xdpi);

    bmwidth = (x1 - x0) * xdpi / DPI_BASE;

    if (bmwidth < SP_EXPORT_MIN_SIZE) {
        bmwidth = SP_EXPORT_MIN_SIZE;
        if (x1 != x0)
            xdpi = bmwidth * DPI_BASE / (x1 - x0);
        else
            xdpi = DPI_BASE;
        setValue(xdpi_adj, xdpi);
    }

    setValue(bmwidth_adj, bmwidth);

    setImageY ();

    update = false;

    return;
} // end of sp_export_xdpi_value_changed()


/**
 * A function to change the area that is used for the exported.
 * bitmap.
 *
 * This function just calls \c sp_export_value_set_px for each of the
 * parameters that is passed in.  This allows for setting them all in
 * one convient area.
 *
 * Update is set to suspend all of the other test running while all the
 * values are being set up.  This allows for a performance increase, but
 * it also means that the wrong type won't be detected with only some of
 * the values set.  After all the values are set everyone is told that
 * there has been an update.
 *
 * @param  x0    Horizontal upper left hand corner of the picture in points.
 * @param  y0    Vertical upper left hand corner of the picture in points.
 * @param  x1    Horizontal lower right hand corner of the picture in points.
 * @param  y1    Vertical lower right hand corner of the picture in points.
 */
void Export::setArea( double x0, double y0, double x1, double y1 )
{
    update = true;
    setValuePx(x1_adj, x1);
    setValuePx(y1_adj, y1);
    setValuePx(x0_adj, x0);
    setValuePx(y0_adj, y0);
    update = false;

    areaXChange (x1_adj);
    areaYChange (y1_adj);

    return;
}

/**
 * Sets the value of an adjustment.
 *
 * @param  adj   The adjustment widget
 * @param  val   What value to set it to.
 */
void Export::setValue(  Gtk::Adjustment *adj, double val )
{
    if (adj) {
        adj->set_value(val);
    }
}

/**
 * A function to set a value using the units points.
 *
 * This function first gets the adjustment for the key that is passed
 * in.  It then figures out what units are currently being used in the
 * dialog.  After doing all of that, it then converts the incoming
 *value and sets the adjustment.
 *
 * @param  adj   The adjustment widget
 * @param  val   What the value should be in points.
 */
void Export::setValuePx( Gtk::Adjustment *adj, double val)
{
    const SPUnit *unit = sp_unit_selector_get_unit ((SPUnitSelector *)unit_selector->gobj() );

    setValue(adj, sp_pixels_get_units (val, *unit));

    return;
}

/**
 * Get the value of an adjustment in the export dialog.
 *
 * This function gets the adjustment from the data field in the export
 * dialog.  It then grabs the value from the adjustment.
 *
 * @param  adj   The adjustment widget
 *
 * @return The value in the specified adjustment.
 */
float Export::getValue(  Gtk::Adjustment *adj )
{
    if (!adj) {
        g_message("sp_export_value_get : adj is NULL");
        return 0.0;
    }
    return adj->get_value();
}

/**
 * Grabs a value in the export dialog and converts the unit
 * to points.
 *
 * This function, at its most basic, is a call to \c sp_export_value_get
 * to get the value of the adjustment.  It then finds the units that
 * are being used by looking at the "units" attribute of the export
 * dialog.  Using that it converts the returned value into points.
 *
 * @param  adj   The adjustment widget
 *
 * @return The value in the adjustment in points.
 */
float Export::getValuePx(  Gtk::Adjustment *adj )
{
    float value = getValue( adj);
    const SPUnit *unit = sp_unit_selector_get_unit ((SPUnitSelector *)unit_selector->gobj());

    return sp_units_get_pixels (value, *unit);
} // end of sp_export_value_get_px()

/**
 * This function is called when the filename is changed by
 * anyone.  It resets the virgin bit.
 *
 * This function gets called when the text area is modified.  It is
 * looking for the case where the text area is modified from its
 * original value.  In that case it sets the "filename-modified" bit
 * to TRUE.  If the text dialog returns back to the original text, the
 * bit gets reset.  This should stop simple mistakes.
 */
void Export::onFilenameModified()
{
    if (strcmp(original_name, filename_entry.get_text().c_str())==0) {
        filename_modified = false;
//        g_message("Modified: FALSE\n");
    } else {
        filename_modified = true;
//        g_message("Modified: TRUE\n");
    }

    return;
} // end sp_export_filename_modified

}
}
}

/*
  Local Variables:
  mode:c++
  c-file-style:"stroustrup"
  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
  indent-tabs-mode:nil
  fill-column:99
  End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :