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document-properties.cpp

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/** \file
 *
 * Document properties dialog, Gtkmm-style
 *
 * Authors:
 *   bulia byak <buliabyak@users.sf.net>
 *   Bryce W. Harrington <bryce@bryceharrington.org>
 *   Lauris Kaplinski <lauris@kaplinski.com>
 *   Jon Phillips <jon@rejon.org>
 *   Ralf Stephan <ralf@ark.in-berlin.de> (Gtkmm)
 *
 * Copyright (C) 2006-2008 Johan Engelen  <johan@shouraizou.nl>
 * Copyright (C) 2000 - 2005 Authors
 *
 * Released under GNU GPL.  Read the file 'COPYING' for more information
 */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif



#include <gtkmm.h>
#include "ui/widget/color-picker.h"
#include "ui/widget/scalar-unit.h"

#include "xml/node-event-vector.h"
#include "helper/units.h"
#include "prefs-utils.h"

#include "inkscape.h"
#include "verbs.h"
#include "document.h"
#include "desktop-handles.h"
#include "desktop.h"
#include "sp-namedview.h"
#include "widgets/icon.h"
#include "document-properties.h"

#include "display/canvas-grid.h"

using std::pair;

namespace Inkscape {
namespace UI {
namespace Dialog {

#define SPACE_SIZE_X 15
#define SPACE_SIZE_Y 10

#define INKSCAPE_ICON_GRID_XY     "grid_xy"
#define INKSCAPE_ICON_GRID_AXONOM "grid_axonom"


//===================================================

//---------------------------------------------------

static void on_child_added(Inkscape::XML::Node *repr, Inkscape::XML::Node *child, Inkscape::XML::Node *ref, void * data);
static void on_child_removed(Inkscape::XML::Node *repr, Inkscape::XML::Node *child, Inkscape::XML::Node *ref, void * data);
static void on_repr_attr_changed (Inkscape::XML::Node *, gchar const *, gchar const *, gchar const *, bool, gpointer);

static Inkscape::XML::NodeEventVector const _repr_events = {
    on_child_added, /* child_added */
    on_child_removed, /* child_removed */
    on_repr_attr_changed,
    NULL, /* content_changed */
    NULL  /* order_changed */
};


DocumentProperties &
DocumentProperties::getInstance()
{
    DocumentProperties &instance = *new DocumentProperties();
    instance.init();

    return instance;
}

DocumentProperties::DocumentProperties()
    : UI::Widget::Panel ("", "dialogs.documentoptions", SP_VERB_DIALOG_NAMEDVIEW),
      _page_page(1, 1), _page_guides(1, 1),
      _page_snap(1, 1), _page_snap_dtls(1, 1),
    //---------------------------------------------------------------
      _rcb_canb(_("Show page _border"), _("If set, rectangular page border is shown"), "showborder", _wr, false),
      _rcb_bord(_("Border on _top of drawing"), _("If set, border is always on top of the drawing"), "borderlayer", _wr, false),
      _rcb_shad(_("_Show border shadow"), _("If set, page border shows a shadow on its right and lower side"), "inkscape:showpageshadow", _wr, false),
      _rcp_bg(_("Back_ground:"), _("Background color"), _("Color and transparency of the page background (also used for bitmap export)"), "pagecolor", "inkscape:pageopacity", _wr),
      _rcp_bord(_("Border _color:"), _("Page border color"), _("Color of the page border"), "bordercolor", "borderopacity", _wr),
    //---------------------------------------------------------------
      //General snap options
      _rcb_sgui(_("Show _guides"), _("Show or hide guides"), "showguides", _wr),
      _rcbsng(_("_Snap guides while dragging"), _("While dragging a guide, snap to object nodes or bounding box corners ('Snap to nodes' or 'snap to bounding box corners' must be enabled in the 'Snap' tab; only a small part of the guide near the cursor will snap)"),
                  "inkscape:snap-guide", _wr),
      _rcp_gui(_("Guide co_lor:"), _("Guideline color"), _("Color of guidelines"), "guidecolor", "guideopacity", _wr),
      _rcp_hgui(_("_Highlight color:"), _("Highlighted guideline color"), _("Color of a guideline when it is under mouse"), "guidehicolor", "guidehiopacity", _wr),
    //---------------------------------------------------------------
      _rcbsg(_("_Enable snapping"), _("Toggle snapping on or off"), "inkscape:snap-global", _wr),
      _rcbsnbb(_("_Bounding box corners"), _("Only available in the selector tool: snap bounding box corners to guides, to grids, and to other bounding boxes (but not to nodes or paths)"),
                  "inkscape:snap-bbox", _wr),
      _rcbsnn(_("_Nodes"), _("Snap nodes (e.g. path nodes, special points in shapes, gradient handles, text base points, transformation origins, etc.) to guides, to grids, to paths and to other nodes"),
                "inkscape:snap-nodes", _wr),
      //Options for snapping to objects
      _rcbsnop(_("Snap to path_s"), _("Snap nodes to object paths"), "inkscape:object-paths", _wr),
      _rcbsnon(_("Snap to n_odes"), _("Snap nodes and guides to object nodes"), "inkscape:object-nodes", _wr),
      _rcbsnbbp(_("Snap to bounding bo_x edges"), _("Snap bounding box corners and guides to bounding box edges"), "inkscape:bbox-paths", _wr),
      _rcbsnbbn(_("Snap to bounding box co_rners"), _("Snap bounding box corners to other bounding box corners"), "inkscape:bbox-nodes", _wr),
    //---------------------------------------------------------------
       //Applies to both nodes and guides, but not to bboxes, that's why its located here
      _rcbic( _("Rotation _center"), _("Consider the rotation center of an object when snapping"), "inkscape:snap-center", _wr),
      _rcbsigg(_("_Grid with guides"), _("Snap to grid-guide intersections"), "inkscape:snap-intersection-grid-guide", _wr),
      _rcbsils(_("_Line segments"), _("Snap to intersections of line segments ('snap to paths' must be enabled, see the previous tab)"),
                "inkscape:snap-intersection-line-segments", _wr),
    //---------------------------------------------------------------
      _grids_label_crea("", Gtk::ALIGN_LEFT),
      //TRANSLATORS: In Grid|_New translate only the word _New. It ref to grid
      _grids_button_new(Q_("Grid|_New"), _("Create new grid.")),
      _grids_button_remove(_("_Remove"), _("Remove selected grid.")),
      _grids_label_def("", Gtk::ALIGN_LEFT),
    //---------------------------------------------------------------
      _prefs_path("dialogs.documentoptions")
{
    _tt.enable();
    _getContents()->set_spacing (4);
    _getContents()->pack_start(_notebook, true, true);

    _notebook.append_page(_page_page,      _("Page"));
    _notebook.append_page(_page_guides,    _("Guides"));
    _notebook.append_page(_grids_vbox,     _("Grids"));
    _notebook.append_page(_page_snap,      _("Snap"));
    _notebook.append_page(_page_snap_dtls, _("Snap points"));

    build_page();
    build_guides();
    build_gridspage();
    build_snap();
    build_snap_dtls();

    _grids_button_new.signal_clicked().connect(sigc::mem_fun(*this, &DocumentProperties::onNewGrid));
    _grids_button_remove.signal_clicked().connect(sigc::mem_fun(*this, &DocumentProperties::onRemoveGrid));

    signalDocumentReplaced().connect(sigc::mem_fun(*this, &DocumentProperties::_handleDocumentReplaced));
    signalActivateDesktop().connect(sigc::mem_fun(*this, &DocumentProperties::_handleActivateDesktop));
    signalDeactiveDesktop().connect(sigc::mem_fun(*this, &DocumentProperties::_handleDeactivateDesktop));
}

void
DocumentProperties::init()
{
    update();

    Inkscape::XML::Node *repr = SP_OBJECT_REPR(sp_desktop_namedview(getDesktop()));
    repr->addListener (&_repr_events, this);
    Inkscape::XML::Node *root = SP_OBJECT_REPR(sp_desktop_document(getDesktop())->root);
    root->addListener (&_repr_events, this);

    show_all_children();
    _grids_button_remove.hide();
}

DocumentProperties::~DocumentProperties()
{
    Inkscape::XML::Node *repr = SP_OBJECT_REPR(sp_desktop_namedview(getDesktop()));
    repr->removeListenerByData (this);
    Inkscape::XML::Node *root = SP_OBJECT_REPR(sp_desktop_document(getDesktop())->root);
    root->removeListenerByData (this);
}

//========================================================================

/**
 * Helper function that attaches widgets in a 3xn table. The widgets come in an
 * array that has two entries per table row. The two entries code for four
 * possible cases: (0,0) means insert space in first column; (0, non-0) means
 * widget in columns 2-3; (non-0, 0) means label in columns 1-3; and
 * (non-0, non-0) means two widgets in columns 2 and 3.
**/
inline void
attach_all(Gtk::Table &table, Gtk::Widget *const arr[], unsigned const n, int start = 0)
{
    for (unsigned i = 0, r = start; i < n; i += 2)
    {
        if (arr[i] && arr[i+1])
        {
            table.attach(*arr[i],   1, 2, r, r+1,
                      Gtk::FILL|Gtk::EXPAND, (Gtk::AttachOptions)0,0,0);
            table.attach(*arr[i+1], 2, 3, r, r+1,
                      Gtk::FILL|Gtk::EXPAND, (Gtk::AttachOptions)0,0,0);
        }
        else
        {
            if (arr[i+1])
                table.attach(*arr[i+1], 1, 3, r, r+1,
                      Gtk::FILL|Gtk::EXPAND, (Gtk::AttachOptions)0,0,0);
            else if (arr[i])
            {
                Gtk::Label& label = reinterpret_cast<Gtk::Label&>(*arr[i]);
                label.set_alignment (0.0);
                table.attach (label, 0, 3, r, r+1,
                      Gtk::FILL|Gtk::EXPAND, (Gtk::AttachOptions)0,0,0);
            }
            else
            {
                Gtk::HBox *space = manage (new Gtk::HBox);
                space->set_size_request (SPACE_SIZE_X, SPACE_SIZE_Y);
                table.attach (*space, 0, 1, r, r+1,
                      (Gtk::AttachOptions)0, (Gtk::AttachOptions)0,0,0);
            }
        }
        ++r;
    }
}

void
DocumentProperties::build_page()
{
    _page_page.show();

    _rum_deflt.init (_("Default _units:"), "inkscape:document-units", _wr);

    Gtk::Label* label_gen = manage (new Gtk::Label);
    label_gen->set_markup (_("<b>General</b>"));
    Gtk::Label* label_bor = manage (new Gtk::Label);
    label_bor->set_markup (_("<b>Border</b>"));
    Gtk::Label *label_for = manage (new Gtk::Label);
    label_for->set_markup (_("<b>Format</b>"));
    _page_sizer.init (_wr);

    Gtk::Widget *const widget_array[] =
    {
        label_gen,         0,
        _rum_deflt._label, _rum_deflt._sel,
        _rcp_bg._label,    &_rcp_bg,
        0,                 0,
        label_for,         0,
        0,                 &_page_sizer,
        0,                 0,
        label_bor,         0,
        0,                 &_rcb_canb,
        0,                 &_rcb_bord,
        0,                 &_rcb_shad,
        _rcp_bord._label,  &_rcp_bord,
    };

    attach_all(_page_page.table(), widget_array, G_N_ELEMENTS(widget_array));
}

void
DocumentProperties::build_guides()
{
    _page_guides.show();

    Gtk::Label *label_gui = manage (new Gtk::Label);
    label_gui->set_markup (_("<b>Guides</b>"));

    Gtk::Widget *const widget_array[] =
    {
        label_gui,        0,
        0,                &_rcb_sgui,
        _rcp_gui._label,  &_rcp_gui,
        _rcp_hgui._label, &_rcp_hgui,
        0,                &_rcbsng,
    };

    attach_all(_page_guides.table(), widget_array, G_N_ELEMENTS(widget_array));
}

void
DocumentProperties::build_snap()
{
    _page_snap.show();

    _rsu_sno.init (_("Snap _distance"), _("Snap only when _closer than:"),
                  _("Snapping distance, in screen pixels, for snapping to objects"),
                  _("If set, objects only snap to another object when it's within the range specified below"),
                  "objecttolerance", _wr);

    //Options for snapping to grids
    _rsu_sn.init (_("Snap d_istance"), _("Snap only when c_loser than:"),
                  _("Snapping distance, in screen pixels, for snapping to grid"),
                  _("If set, objects only snap to a grid line when it's within the range specified below"),
                  "gridtolerance", _wr);

      //Options for snapping to guides
    _rsu_gusn.init (_("Snap dist_ance"), _("Snap only when close_r than:"),
                _("Snapping distance, in screen pixels, for snapping to guides"),
                _("If set, objects only snap to a guide when it's within the range specified below"),
                "guidetolerance", _wr);

    //Other options to locate here: e.g. visual snapping indicators on/off

    std::list<Gtk::Widget*> slaves;
    slaves.push_back(&_rcbsnop);
    slaves.push_back(&_rcbsnon);
    _rcbsnn.setSlaveWidgets(slaves);

    slaves.clear();
    slaves.push_back(&_rcbsnbbp);
    slaves.push_back(&_rcbsnbbn);
    _rcbsnbb.setSlaveWidgets(slaves);
    
    slaves.clear();
    slaves.push_back(&_rcbsnn);
    slaves.push_back(&_rcbsnbb);
    
    _rcbsg.setSlaveWidgets(slaves);

    Gtk::Label *label_g = manage (new Gtk::Label);
    label_g->set_markup (_("<b>Snapping</b>"));
    Gtk::Label *label_w = manage (new Gtk::Label);
    label_w->set_markup (_("<b>What snaps</b>"));    
    Gtk::Label *label_o = manage (new Gtk::Label);
    label_o->set_markup (_("<b>Snap to objects</b>"));
    Gtk::Label *label_gr = manage (new Gtk::Label);
    label_gr->set_markup (_("<b>Snap to grids</b>"));
    Gtk::Label *label_gu = manage (new Gtk::Label);
    label_gu->set_markup (_("<b>Snap to guides</b>"));
    
    Gtk::Widget *const array[] =
    {
        label_g,            0,
        0,                  &_rcbsg,
        0,                  0,
        label_w,            0,
        0,                  &_rcbsnn,
        0,                  &_rcbsnbb,
        0,                          0,
        label_o,            0,
        0,                  &_rcbsnop,
        0,                  &_rcbsnon,
        0,                  &_rcbsnbbp,
        0,                  &_rcbsnbbn,
        0,                  _rsu_sno._vbox,
        0,                          0,
        label_gr,           0,
        0,                  _rsu_sn._vbox,
        0,                          0,
        label_gu,             0,
        0,                    _rsu_gusn._vbox
    };

    attach_all(_page_snap.table(), array, G_N_ELEMENTS(array));
 }

void
DocumentProperties::build_snap_dtls()
{
    _page_snap_dtls.show();

    //Other options to locate here: e.g. visual snapping indicators on/off

    Gtk::Label *label_i= manage (new Gtk::Label);
    label_i->set_markup (_("<b>Snapping to intersections of</b>"));
    Gtk::Label *label_m = manage (new Gtk::Label);
    label_m->set_markup (_("<b>Snapping to special nodes</b>"));

    Gtk::Widget *const array[] =
    {
        label_i,            0,
        0,                  &_rcbsigg,
        0,                  &_rcbsils,
        0,                  0,
        label_m,            0,
        0,                  &_rcbic,
    };

    attach_all(_page_snap_dtls.table(), array, G_N_ELEMENTS(array));
}

/**
* Called for _updating_ the dialog (e.g. when a new grid was manually added in XML)
*/
void
DocumentProperties::update_gridspage()
{
    SPDesktop *dt = getDesktop();
    SPNamedView *nv = sp_desktop_namedview(dt);

    //remove all tabs
    while (_grids_notebook.get_n_pages() != 0) {
        _grids_notebook.remove_page(-1); // this also deletes the page.
    }

    //add tabs
    bool grids_present = false;
    for (GSList const * l = nv->grids; l != NULL; l = l->next) {
        Inkscape::CanvasGrid * grid = (Inkscape::CanvasGrid*) l->data;
        if (!grid->repr->attribute("id")) continue; // update_gridspage is called again when "id" is added
        Glib::ustring name(grid->repr->attribute("id"));
        const char *icon = NULL;
        switch (grid->getGridType()) {
            case GRID_RECTANGULAR:
                icon = INKSCAPE_ICON_GRID_XY;
                break;
            case GRID_AXONOMETRIC:
                icon = INKSCAPE_ICON_GRID_AXONOM;
                break;
            default:
                break;
        }
        _grids_notebook.append_page(*grid->newWidget(), _createPageTabLabel(name, icon));
        grids_present = true;
    }
    _grids_notebook.show_all();

    if (grids_present)
        _grids_button_remove.set_sensitive(true);
    else
        _grids_button_remove.set_sensitive(false);
}

/**
 * Build grid page of dialog.
 */
void
DocumentProperties::build_gridspage()
{
    /// \todo FIXME: gray out snapping when grid is off.
    /// Dissenting view: you want snapping without grid.

    SPDesktop *dt = getDesktop();
    SPNamedView *nv = sp_desktop_namedview(dt);

    _grids_label_crea.set_markup(_("<b>Creation</b>"));
    _grids_label_def.set_markup(_("<b>Defined grids</b>"));
    _grids_hbox_crea.pack_start(_grids_combo_gridtype, true, true);
    _grids_hbox_crea.pack_start(_grids_button_new, true, true);

    for (gint t = 0; t <= GRID_MAXTYPENR; t++) {
        _grids_combo_gridtype.append_text( CanvasGrid::getName( (GridType) t ) );
    }
    _grids_combo_gridtype.set_active_text( CanvasGrid::getName(GRID_RECTANGULAR) );

    _grids_space.set_size_request (SPACE_SIZE_X, SPACE_SIZE_Y);

    _grids_vbox.set_spacing(4);
    _grids_vbox.pack_start(_grids_label_crea, false, false);
    _grids_vbox.pack_start(_grids_hbox_crea, false, false);
    _grids_vbox.pack_start(_grids_space, false, false);
    _grids_vbox.pack_start(_grids_label_def, false, false);
    _grids_vbox.pack_start(_grids_notebook, false, false);
    _grids_vbox.pack_start(_grids_button_remove, false, false);

    update_gridspage();
}



/**
 * Update dialog widgets from desktop. Also call updateWidget routines of the grids.
 */
void
DocumentProperties::update()
{
    if (_wr.isUpdating()) return;

    SPDesktop *dt = getDesktop();
    SPNamedView *nv = sp_desktop_namedview(dt);

    _wr.setUpdating (true);
    set_sensitive (true);

    //-----------------------------------------------------------page page
    _rcp_bg.setRgba32 (nv->pagecolor);
    _rcb_canb.setActive (nv->showborder);
    _rcb_bord.setActive (nv->borderlayer == SP_BORDER_LAYER_TOP);
    _rcp_bord.setRgba32 (nv->bordercolor);
    _rcb_shad.setActive (nv->showpageshadow);

    if (nv->doc_units)
        _rum_deflt.setUnit (nv->doc_units);

    double const doc_w_px = sp_document_width(sp_desktop_document(dt));
    double const doc_h_px = sp_document_height(sp_desktop_document(dt));
    _page_sizer.setDim (doc_w_px, doc_h_px);

    //-----------------------------------------------------------guide
    _rcb_sgui.setActive (nv->showguides);
    _rcp_gui.setRgba32 (nv->guidecolor);
    _rcp_hgui.setRgba32 (nv->guidehicolor);

    //-----------------------------------------------------------snap

    _rcbsnbb.setActive (nv->snap_manager.getSnapModeBBox());
    _rcbsnn.setActive (nv->snap_manager.getSnapModeNode());
    _rcbsng.setActive (nv->snap_manager.getSnapModeGuide());
    _rcbic.setActive (nv->snap_manager.getIncludeItemCenter());
    _rcbsigg.setActive (nv->snap_manager.getSnapIntersectionGG());
    _rcbsils.setActive (nv->snap_manager.getSnapIntersectionLS());    
    _rcbsnop.setActive(nv->snap_manager.object.getSnapToItemPath());
    _rcbsnon.setActive(nv->snap_manager.object.getSnapToItemNode());
    _rcbsnbbp.setActive(nv->snap_manager.object.getSnapToBBoxPath());
    _rcbsnbbn.setActive(nv->snap_manager.object.getSnapToBBoxNode());
    _rsu_sno.setValue (nv->objecttolerance);

    _rsu_sn.setValue (nv->gridtolerance);

    _rsu_gusn.setValue (nv->guidetolerance);
    
    _rcbsg.setActive (nv->snap_manager.getSnapEnabledGlobally());    

    //-----------------------------------------------------------grids page

    update_gridspage();

    _wr.setUpdating (false);
}

// TODO: copied from fill-and-stroke.cpp factor out into new ui/widget file?
Gtk::HBox&
DocumentProperties::_createPageTabLabel(const Glib::ustring& label, const char *label_image)
{
    Gtk::HBox *_tab_label_box = manage(new Gtk::HBox(false, 0));
    _tab_label_box->set_spacing(4);
    _tab_label_box->pack_start(*Glib::wrap(sp_icon_new(Inkscape::ICON_SIZE_DECORATION,
                                                       label_image)));

    Gtk::Label *_tab_label = manage(new Gtk::Label(label, true));
    _tab_label_box->pack_start(*_tab_label);
    _tab_label_box->show_all();

    return *_tab_label_box;
}

//--------------------------------------------------------------------

void
DocumentProperties::on_response (int id)
{
    if (id == Gtk::RESPONSE_DELETE_EVENT || id == Gtk::RESPONSE_CLOSE)
    {
        _rcp_bg.closeWindow();
        _rcp_bord.closeWindow();
        _rcp_gui.closeWindow();
        _rcp_hgui.closeWindow();
    }

    if (id == Gtk::RESPONSE_CLOSE)
        hide();
}

void 
DocumentProperties::_handleDocumentReplaced(SPDesktop* desktop, SPDocument *document)
{
    Inkscape::XML::Node *repr = SP_OBJECT_REPR(sp_desktop_namedview(desktop));
    repr->addListener(&_repr_events, this);
    Inkscape::XML::Node *root = SP_OBJECT_REPR(document->root);
    root->addListener(&_repr_events, this);
    update();
}

void 
DocumentProperties::_handleActivateDesktop(Inkscape::Application *, SPDesktop *desktop)
{
    Inkscape::XML::Node *repr = SP_OBJECT_REPR(sp_desktop_namedview(desktop));
    repr->addListener(&_repr_events, this);
    Inkscape::XML::Node *root = SP_OBJECT_REPR(sp_desktop_document(desktop)->root);
    root->addListener(&_repr_events, this);
    update();
}

void
DocumentProperties::_handleDeactivateDesktop(Inkscape::Application *, SPDesktop *desktop)
{
    Inkscape::XML::Node *repr = SP_OBJECT_REPR(sp_desktop_namedview(desktop));
    repr->removeListenerByData(this);
    Inkscape::XML::Node *root = SP_OBJECT_REPR(sp_desktop_document(desktop)->root);
    root->removeListenerByData(this);
}

static void
on_child_added(Inkscape::XML::Node */*repr*/, Inkscape::XML::Node */*child*/, Inkscape::XML::Node */*ref*/, void *data)
{
    if (DocumentProperties *dialog = static_cast<DocumentProperties *>(data))
      dialog->update_gridspage();
}

static void
on_child_removed(Inkscape::XML::Node */*repr*/, Inkscape::XML::Node */*child*/, Inkscape::XML::Node */*ref*/, void *data)
{
    if (DocumentProperties *dialog = static_cast<DocumentProperties *>(data))
      dialog->update_gridspage();
}



/**
 * Called when XML node attribute changed; updates dialog widgets.
 */
static void
on_repr_attr_changed (Inkscape::XML::Node *, gchar const *, gchar const *, gchar const *, bool, gpointer data)
{
    if (DocumentProperties *dialog = static_cast<DocumentProperties *>(data))
      dialog->update();
}


/*########################################################################
# BUTTON CLICK HANDLERS    (callbacks)
########################################################################*/

void
DocumentProperties::onNewGrid()
{
    SPDesktop *dt = getDesktop();
    Inkscape::XML::Node *repr = SP_OBJECT_REPR(sp_desktop_namedview(dt));
    SPDocument *doc = sp_desktop_document(dt);

    Glib::ustring typestring = _grids_combo_gridtype.get_active_text();
    CanvasGrid::writeNewGridToRepr(repr, doc, CanvasGrid::getGridTypeFromName(typestring.c_str()));

    // toggle grid showing to ON:
    dt->showGrids(true);
}


void
DocumentProperties::onRemoveGrid()
{
    gint pagenum = _grids_notebook.get_current_page();
    if (pagenum == -1) // no pages
      return;

    SPDesktop *dt = getDesktop();
    SPNamedView *nv = sp_desktop_namedview(dt);
    Inkscape::CanvasGrid * found_grid = NULL;
    int i = 0;
    for (GSList const * l = nv->grids; l != NULL; l = l->next, i++) {  // not a very nice fix, but works.
        Inkscape::CanvasGrid * grid = (Inkscape::CanvasGrid*) l->data;
        if (pagenum == i) {
            found_grid = grid;
            break; // break out of for-loop
        }
    }
    if (found_grid) {
        // delete the grid that corresponds with the selected tab
        // when the grid is deleted from SVG, the SPNamedview handler automatically deletes the object, so found_grid becomes an invalid pointer!
        found_grid->repr->parent()->removeChild(found_grid->repr);
        sp_document_done(sp_desktop_document(dt), SP_VERB_DIALOG_NAMEDVIEW, _("Remove grid"));
    }
}


} // namespace Dialog
} // namespace UI
} // namespace Inkscape

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

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