sp-namedview.cpp

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * <sodipodi:namedview> implementation
 *
 * Authors:
 *   Lauris Kaplinski <lauris@kaplinski.com>
 *   bulia byak <buliabyak@users.sf.net>
 *   Jon A. Cruz <jon@joncruz.org>
 *   Abhishek Sharma
 *
 * Copyright (C) 2006      Johan Engelen <johan@shouraizou.nl>
 * Copyright (C) 1999-2013 Authors
 * Copyright (C) 2000-2001 Ximian, Inc.
 *
 * Released under GNU GPL v2+, read the file 'COPYING' for more information.
 */
 
#include "sp-namedview.h"
 
#include <cstring>
#include <string>
 
#include <2geom/transforms.h>
 
#include <gtkmm/window.h>
 
#include "attributes.h"
#include "colors/manager.h"
#include "conn-avoid-ref.h" // for defaultConnSpacing.
#include "desktop.h"
#include "document-undo.h"
#include "document.h"
#include "enums.h"
#include "event-log.h"
#include "inkscape-window.h"
#include "layer-manager.h"
#include "page-manager.h"
#include "preferences.h"
#include "sp-guide.h"
#include "sp-grid.h"
#include "sp-page.h"
#include "sp-item-group.h"
#include "sp-root.h"
 
#include "actions/actions-canvas-snapping.h"
#include "display/control/canvas-page.h"
#include "ui/monitor.h"
#include "ui/widget/canvas.h"
#include "ui/widget/canvas-grid.h"
#include "ui/widget/desktop-widget.h"
#include "util/units.h"
 
using Inkscape::DocumentUndo;
using Inkscape::Util::UnitTable;
 
SPNamedView::SPNamedView() : SPObjectGroup(),
    snap_manager(this, get_snapping_preferences()),
    _viewport{new Inkscape::CanvasPage()}
{
    connector_spacing = defaultConnSpacing;
 
    _viewport->hide();
}
 
SPNamedView::~SPNamedView()
{ }
 
void SPNamedView::build(SPDocument *document, Inkscape::XML::Node *repr) {
    SPObjectGroup::build(document, repr);
 
    readAttr(SPAttr::INKSCAPE_DOCUMENT_UNITS);
    readAttr(SPAttr::UNITS);
    readAttr(SPAttr::VIEWONLY);
    readAttr(SPAttr::SHOWGUIDES);
    readAttr(SPAttr::SHOWGRIDS);
    readAttr(SPAttr::GRIDTOLERANCE);
    readAttr(SPAttr::GUIDETOLERANCE);
    readAttr(SPAttr::OBJECTTOLERANCE);
    readAttr(SPAttr::ALIGNMENTTOLERANCE);
    readAttr(SPAttr::DISTRIBUTIONTOLERANCE);
    readAttr(SPAttr::GUIDECOLOR);
    readAttr(SPAttr::GUIDEOPACITY);
    readAttr(SPAttr::GUIDEHICOLOR);
    readAttr(SPAttr::GUIDEHIOPACITY);
    readAttr(SPAttr::SHOWBORDER);
    readAttr(SPAttr::SHOWPAGESHADOW);
    readAttr(SPAttr::BORDERLAYER);
    readAttr(SPAttr::BORDERCOLOR);
    readAttr(SPAttr::BORDEROPACITY);
    readAttr(SPAttr::PAGECOLOR);
    readAttr(SPAttr::PAGELABELSTYLE);
    readAttr(SPAttr::INKSCAPE_DESK_COLOR);
    readAttr(SPAttr::INKSCAPE_DESK_CHECKERBOARD);
    readAttr(SPAttr::INKSCAPE_PAGESHADOW);
    readAttr(SPAttr::INKSCAPE_ZOOM);
    readAttr(SPAttr::INKSCAPE_ROTATION);
    readAttr(SPAttr::INKSCAPE_CX);
    readAttr(SPAttr::INKSCAPE_CY);
    readAttr(SPAttr::INKSCAPE_WINDOW_WIDTH);
    readAttr(SPAttr::INKSCAPE_WINDOW_HEIGHT);
    readAttr(SPAttr::INKSCAPE_WINDOW_X);
    readAttr(SPAttr::INKSCAPE_WINDOW_Y);
    readAttr(SPAttr::INKSCAPE_WINDOW_MAXIMIZED);
    readAttr(SPAttr::INKSCAPE_CURRENT_LAYER);
    readAttr(SPAttr::INKSCAPE_CONNECTOR_SPACING);
    readAttr(SPAttr::INKSCAPE_LOCKGUIDES);
    readAttr(SPAttr::INKSCAPE_CLIP_TO_PAGE_RENDERING);
    readAttr(SPAttr::INKSCAPE_ANTIALIAS_RENDERING);
    readAttr(SPAttr::INKSCAPE_ORIGIN_CORRECTION);
    readAttr(SPAttr::INKSCAPE_Y_AXIS_DOWN);
 
    /* Construct guideline and pages list */
    for (auto &child : children) {
        if (auto guide = cast<SPGuide>(&child)) {
            guides.push_back(guide);
            guide->setColor(getGuideColor().toRGBA());
            guide->setHiColor(getGuideHiColor().toRGBA());
            guide->readAttr(SPAttr::INKSCAPE_COLOR);
        }
        if (auto page = cast<SPPage>(&child)) {
            document->getPageManager().addPage(page);
        }
        if (auto grid = cast<SPGrid>(&child)) {
            grids.emplace_back(grid);
        }
    }
}
 
void SPNamedView::release() {
    guides.clear();
    grids.clear();
 
    SPObjectGroup::release();
}
 
void SPNamedView::set_clip_to_page(SPDesktop* desktop, bool enable) {
    if (desktop) {
        desktop->getCanvas()->set_clip_to_page_mode(enable);
    }
}
 
static auto const default_desk_color = Inkscape::Colors::Color{0xd1d1d1, false};
static auto const default_guide_color = Inkscape::Colors::Color{0x0086e5, false};
static auto const default_guide_hi_color = Inkscape::Colors::Color{0xff0000, false};
 
Inkscape::Colors::Color SPNamedView::getDeskColor() const
{
    return _desk_color.value_or(default_desk_color);
}
 
Inkscape::Colors::Color SPNamedView::getGuideColor() const
{
    auto copy = _guide_color.value_or(default_guide_color);
    copy.addOpacity(_guide_opacity);
    return copy;
}
 
Inkscape::Colors::Color SPNamedView::getGuideHiColor() const
{
    auto copy = _guide_hi_color.value_or(default_guide_hi_color);
    copy.addOpacity(_guide_hi_opacity);
    return copy;
}
 
void SPNamedView::set_desk_color(SPDesktop* desktop) {
    if (desktop) {
        auto dkcolor = getDeskColor();
        dkcolor.setOpacity(desk_checkerboard ? 0.0 : 1.0);
        desktop->getCanvas()->set_desk(dkcolor.toRGBA());
        // Update pages, whose colours sometimes change whe the desk color changes.
        document->getPageManager().setDefaultAttributes(_viewport.get());
    }
}
 
void SPNamedView::modified(unsigned int flags)
{
    // Copy the page style for the default viewport attributes
    auto &page_manager = document->getPageManager();
    if (flags & SP_OBJECT_MODIFIED_FLAG) {
        page_manager.setDefaultAttributes(_viewport.get());
        updateViewPort();
        // Pass modifications to the page manager to update the page items.
        for (auto &page : page_manager.getPages()) {
            page->setDefaultAttributes();
        }
        // Update unit action group
        auto action = document->getActionGroup()->lookup_action("set-display-unit");
        if (auto saction = std::dynamic_pointer_cast<Gio::SimpleAction>(action)) {
            Glib::VariantType String(Glib::VARIANT_TYPE_STRING);
            saction->change_state(getDisplayUnit()->abbr);
        }
 
        updateGuides();
    }
    // Add desk color and checkerboard pattern to desk view
    for (auto desktop : views) {
        set_desk_color(desktop);
        set_clip_to_page(desktop, clip_to_page);
        if (desktop) {
            desktop->getCanvas()->set_antialiasing_enabled(antialias_rendering);
        }
    }
 
    for (auto child : childList(false)) {
        if (flags || (child->mflags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_CHILD_MODIFIED_FLAG))) {
            child->emitModified(flags & SP_OBJECT_MODIFIED_CASCADE);
        }
    }
}
 
void SPNamedView::update(SPCtx *ctx, guint flags)
{
    if (flags & SP_OBJECT_MODIFIED_FLAG) {
        flags |= SP_OBJECT_PARENT_MODIFIED_FLAG;
    }
 
    flags &= SP_OBJECT_MODIFIED_CASCADE;
 
    for (auto child : childList(false)) {
        if (flags || (child->uflags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_CHILD_MODIFIED_FLAG))) {
            child->updateDisplay(ctx, flags);
        }
    }
}
 
const Inkscape::Util::Unit* sp_parse_document_units(const char* value) {
    /* The default display unit if the document doesn't override this: e.g. for files saved as
        * `plain SVG', or non-inkscape files, or files created by an inkscape 0.40 &
        * earlier.
        *
        * Note that these units are not the same as the units used for the values in SVG!
        *
        * We default to `px'.
        */
    auto const &unit_table = UnitTable::get();
    auto new_unit = unit_table.getUnit("px");
 
    if (value) {
        Inkscape::Util::Unit const *const req_unit = unit_table.getUnit(value);
        if ( !unit_table.hasUnit(value) ) {
            g_warning("Unrecognized unit `%s'", value);
            /* fixme: Document errors should be reported in the status bar or
                * the like (e.g. as per
                * http://www.w3.org/TR/SVG11/implnote.html#ErrorProcessing); g_log
                * should be only for programmer errors. */
        } else if ( req_unit->isAbsolute() ) {
            new_unit = req_unit;
        } else {
            g_warning("Document units must be absolute like `mm', `pt' or `px', but found `%s'", value);
            /* fixme: Don't use g_log (see above). */
        }
    }
 
    return new_unit;
}
 
void SPNamedView::set(SPAttr key, const gchar* value) {
    // Send page attributes to the page manager.
    if (document->getPageManager().subset(key, value)) {
        requestModified(SP_OBJECT_MODIFIED_FLAG);
        return;
    }
 
    auto update_guides = [this]() {
        for(auto guide : guides) {
            guide->setColor(getGuideColor().toRGBA());
            guide->setHiColor(getGuideHiColor().toRGBA());
            guide->readAttr(SPAttr::INKSCAPE_COLOR);
        }
    };
 
    switch (key) {
    case SPAttr::VIEWONLY:
        editable = (!value);
        break;
    case SPAttr::SHOWGUIDES:
        showguides.readOrUnset(value);
        break;
    case SPAttr::INKSCAPE_LOCKGUIDES:
        lockguides.readOrUnset(value);
        break;
    case SPAttr::SHOWGRIDS:
        grids_visible.readOrUnset(value);
        updateGrids();
        break;
    case SPAttr::GRIDTOLERANCE:
        snap_manager.snapprefs.setGridTolerance(value ? g_ascii_strtod(value, nullptr) : 10);
        break;
    case SPAttr::GUIDETOLERANCE:
        snap_manager.snapprefs.setGuideTolerance(value ? g_ascii_strtod(value, nullptr) : 20);
        break;
    case SPAttr::OBJECTTOLERANCE:
        snap_manager.snapprefs.setObjectTolerance(value ? g_ascii_strtod(value, nullptr) : 20);
        break;
    case SPAttr::ALIGNMENTTOLERANCE:
        snap_manager.snapprefs.setAlignementTolerance(value ? g_ascii_strtod(value, nullptr) : 5);
        break;
    case SPAttr::DISTRIBUTIONTOLERANCE:
        snap_manager.snapprefs.setDistributionTolerance(value ? g_ascii_strtod(value, nullptr) : 5);
        break;
    case SPAttr::GUIDECOLOR:
        _guide_color = Inkscape::Colors::Color::parse(value);
        update_guides();
        break;
    case SPAttr::GUIDEOPACITY:
        _guide_opacity = value ? g_ascii_strtod(value, nullptr) : 0.6;
        update_guides();
        break;
    case SPAttr::GUIDEHICOLOR:
        _guide_hi_color = Inkscape::Colors::Color::parse(value);
        update_guides();
        break;
    case SPAttr::GUIDEHIOPACITY:
        _guide_hi_opacity = value ? g_ascii_strtod(value, nullptr) : 0.5;
        update_guides();
        break;
    case SPAttr::INKSCAPE_DESK_COLOR:
        _desk_color = Inkscape::Colors::Color::parse(value);
        break;
    case SPAttr::INKSCAPE_DESK_CHECKERBOARD:
        desk_checkerboard.readOrUnset(value);
        break;
    case SPAttr::INKSCAPE_ZOOM:
        zoom = value ? g_ascii_strtod(value, nullptr) : 0; // zero means not set
        break;
    case SPAttr::INKSCAPE_ROTATION:
        rotation = value ? g_ascii_strtod(value, nullptr) : 0; // zero means not set
        break;
    case SPAttr::INKSCAPE_CX:
        cx = value ? g_ascii_strtod(value, nullptr) : HUGE_VAL; // HUGE_VAL means not set
        break;
    case SPAttr::INKSCAPE_CY:
        cy = value ? g_ascii_strtod(value, nullptr) : HUGE_VAL; // HUGE_VAL means not set
        break;
    case SPAttr::INKSCAPE_WINDOW_WIDTH:
        window_width = value? atoi(value) : -1; // -1 means not set
        break;
    case SPAttr::INKSCAPE_WINDOW_HEIGHT:
        window_height = value ? atoi(value) : -1; // -1 means not set
        break;
    case SPAttr::INKSCAPE_WINDOW_X:
        window_x = value ? atoi(value) : 0;
        break;
    case SPAttr::INKSCAPE_WINDOW_Y:
        window_y = value ? atoi(value) : 0;
        break;
    case SPAttr::INKSCAPE_WINDOW_MAXIMIZED:
        window_maximized = value ? atoi(value) : 0;
        break;
    case SPAttr::INKSCAPE_CURRENT_LAYER:
        default_layer_id = value ? g_quark_from_string(value) : 0;
        break;
    case SPAttr::INKSCAPE_CONNECTOR_SPACING:
        connector_spacing = value ? g_ascii_strtod(value, nullptr) : defaultConnSpacing;
        break;
    case SPAttr::INKSCAPE_DOCUMENT_UNITS:
        display_units = sp_parse_document_units(value);
        break;
    case SPAttr::INKSCAPE_CLIP_TO_PAGE_RENDERING:
        clip_to_page.readOrUnset(value);
        break;
    case SPAttr::INKSCAPE_ANTIALIAS_RENDERING:
        antialias_rendering.readOrUnset(value);
        break;
    /*
    case SPAttr::UNITS: {
        // Only used in "Custom size" section of Document Properties dialog
            Inkscape::Util::Unit const *new_unit = nullptr;
 
            if (value) {
                Inkscape::Util::Unit const *const req_unit = unit_table.getUnit(value);
                if ( !unit_table.hasUnit(value) ) {
                    g_warning("Unrecognized unit `%s'", value);
                    / * fixme: Document errors should be reported in the status bar or
                     * the like (e.g. as per
                     * http://www.w3.org/TR/SVG11/implnote.html#ErrorProcessing); g_log
                     * should be only for programmer errors. * /
                } else if ( req_unit->isAbsolute() ) {
                    new_unit = req_unit;
                } else {
                    g_warning("Document units must be absolute like `mm', `pt' or `px', but found `%s'",
                              value);
                    / * fixme: Don't use g_log (see above). * /
                }
            }
            this->page_size_units = new_unit;
            break;
    } */
    case SPAttr::INKSCAPE_ORIGIN_CORRECTION:
        _origin_correction.readOrUnset(value);
        break;
    case SPAttr::INKSCAPE_Y_AXIS_DOWN:
        _y_axis_down.readOrUnset(value);
        break;
    default:
        SPObjectGroup::set(key, value);
        return;
    }
 
    requestModified(SP_OBJECT_MODIFIED_FLAG);
}
 
void SPNamedView::updateViewPort()
{
    auto box = document->preferredBounds();
    if (auto page = document->getPageManager().getPageAt(box->corner(0))) {
        // An existing page is set as the main page, so hide th viewport canvas item.
        _viewport->hide();
        // This means the page is in the middle of being moved, so please don't move.
        if (page->isViewportPage()) {
            page->setDesktopRect(*box);
        }
    } else {
        // Otherwise we are showing the viewport item.
        _viewport->show();
        _viewport->update(*box, {}, {}, nullptr, document->getPageManager().hasPages(), document->is_yaxisdown());
    }
}
 
void SPNamedView::child_added(Inkscape::XML::Node *child, Inkscape::XML::Node *ref) {
    SPObjectGroup::child_added(child, ref);
 
    SPObject *no = document->getObjectByRepr(child);
    if (!no)
        return;
 
    if (auto grid = cast<SPGrid>(no)) {
        grids.emplace_back(grid);
        for (auto view : views) {
            grid->show(view);
        }
    } else if (!strcmp(child->name(), "inkscape:page")) {
        if (auto page = cast<SPPage>(no)) {
            document->getPageManager().addPage(page);
            for (auto view : views) {
                page->showPage(view->getCanvasPagesBg(), view->getCanvasPagesFg());
            }
        }
    } else {
        if (auto g = cast<SPGuide>(no)) {
            guides.push_back(g);
 
            //g_object_set(G_OBJECT(g), "color", this->guidecolor, "hicolor", this->guidehicolor, NULL);
            g->setColor(getGuideColor().toRGBA());
            g->setHiColor(getGuideHiColor().toRGBA());
            g->readAttr(SPAttr::INKSCAPE_COLOR);
 
            if (editable) {
                for(auto view : views) {
                    g->SPGuide::showSPGuide(view->getCanvasGuides());
 
                    if (view->guides_active) {
                        g->sensitize(view->getCanvas(), TRUE);
                    }
 
                    setShowGuideSingle(g);
                }
            }
        }
    }
}
 
void SPNamedView::remove_child(Inkscape::XML::Node *child) {
    if (!strcmp(child->name(), "inkscape:page")) {
        document->getPageManager().removePage(child);
    } else if (!strcmp(child->name(), "inkscape:grid")) {
        for (auto it = grids.begin(); it != grids.end(); ++it) {
            auto grid = *it;
            if (grid->getRepr() == child) {
                for (auto view : views) {
                    grid->hide(view);
                }
                grids.erase(it);
                break;
            }
        }
    } else {
        for (auto it = guides.begin(); it != guides.end(); ++it) {
            if ((*it)->getRepr() == child) {
                guides.erase(it);
                break;
            }
        }
    }
 
    SPObjectGroup::remove_child(child);
}
 
void SPNamedView::order_changed(Inkscape::XML::Node *child, Inkscape::XML::Node *old_repr,
                                Inkscape::XML::Node *new_repr)
{
    SPObjectGroup::order_changed(child, old_repr, new_repr);
    if (!strcmp(child->name(), "inkscape:page")) {
        document->getPageManager().reorderPage(child);
    }
}
 
Inkscape::XML::Node* SPNamedView::write(Inkscape::XML::Document *xml_doc, Inkscape::XML::Node *repr, guint flags) {
    if ( ( flags & SP_OBJECT_WRITE_EXT ) &&
         repr != this->getRepr() )
    {
        if (repr) {
            repr->mergeFrom(this->getRepr(), "id");
        } else {
            repr = this->getRepr()->duplicate(xml_doc);
        }
    }
 
    return repr;
}
 
void SPNamedView::show(SPDesktop *desktop)
{
    for (auto guide : guides) {
        guide->showSPGuide( desktop->getCanvasGuides() );
 
        if (desktop->guides_active) {
            guide->sensitize(desktop->getCanvas(), TRUE);
        }
        setShowGuideSingle(guide);
    }
 
    for (auto grid : grids) {
        grid->show(desktop);
    }
 
    auto box = document->preferredBounds();
    _viewport->add(*box, desktop->getCanvasPagesBg(), desktop->getCanvasPagesFg());
    document->getPageManager().setDefaultAttributes(_viewport.get());
    updateViewPort();
 
    for (auto page : document->getPageManager().getPages()) {
        page->showPage(desktop->getCanvasPagesBg(), desktop->getCanvasPagesFg());
    }
 
    views.push_back(desktop);
}
 
/*
 * Restores window geometry from the document settings or defaults in prefs
 */
void sp_namedview_window_from_document(SPDesktop *desktop)
{
    SPNamedView *nv = desktop->getNamedView();
    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
    int window_geometry = prefs->getInt("/options/savewindowgeometry/value", PREFS_WINDOW_GEOMETRY_NONE);
    int default_size = prefs->getInt("/options/defaultwindowsize/value", PREFS_WINDOW_SIZE_NATURAL);
    bool new_document = (nv->window_width <= 0) || (nv->window_height <= 0);
 
    // restore window size and position stored with the document
    auto win = desktop->getInkscapeWindow();
    g_assert(win);
 
    if (window_geometry == PREFS_WINDOW_GEOMETRY_LAST) {
        gint pw = prefs->getInt("/desktop/geometry/width", -1);
        gint ph = prefs->getInt("/desktop/geometry/height", -1);
        gint px = prefs->getInt("/desktop/geometry/x", -1);
        gint py = prefs->getInt("/desktop/geometry/y", -1);
        gint full = prefs->getBool("/desktop/geometry/fullscreen");
        gint maxed = prefs->getBool("/desktop/geometry/maximized");
        if (pw>0 && ph>0) {
 
            Gdk::Rectangle monitor_geometry = Inkscape::UI::get_monitor_geometry_at_point(px, py);
            pw = std::min(pw, monitor_geometry.get_width());
            ph = std::min(ph, monitor_geometry.get_height());
            desktop->setWindowSize({pw, ph});
        }
        if (maxed) {
            win->maximize();
        }
        if (full) {
            win->fullscreen();
        }
    } else if ((window_geometry == PREFS_WINDOW_GEOMETRY_FILE && nv->window_maximized) ||
               ((new_document || window_geometry == PREFS_WINDOW_GEOMETRY_NONE) &&
                default_size == PREFS_WINDOW_SIZE_MAXIMIZED)) {
        win->maximize();
    } else {
        const int MIN_WINDOW_SIZE = 600;
 
        int w = prefs->getInt("/template/base/inkscape:window-width", 0);
        int h = prefs->getInt("/template/base/inkscape:window-height", 0);
        bool move_to_screen = false;
        if (window_geometry == PREFS_WINDOW_GEOMETRY_FILE && !new_document) {
            Gdk::Rectangle monitor_geometry = Inkscape::UI::get_monitor_geometry_at_point(nv->window_x, nv->window_y);
            w = MIN(monitor_geometry.get_width(), nv->window_width);
            h = MIN(monitor_geometry.get_height(), nv->window_height);
            move_to_screen = true;
        } else if (default_size == PREFS_WINDOW_SIZE_LARGE) {
            Gdk::Rectangle monitor_geometry = Inkscape::UI::get_monitor_geometry_at_surface(win->get_surface());
            w = MAX(0.75 * monitor_geometry.get_width(), MIN_WINDOW_SIZE);
            h = MAX(0.75 * monitor_geometry.get_height(), MIN_WINDOW_SIZE);
        } else if (default_size == PREFS_WINDOW_SIZE_SMALL) {
            w = h = MIN_WINDOW_SIZE;
        } else if (default_size == PREFS_WINDOW_SIZE_NATURAL) {
            // don't set size (i.e. keep the gtk+ default, which will be the natural size)
            w = h = 0;
            // unless gtk+ decided it would be a good idea to show a window that is larger than the screen
            Gdk::Rectangle monitor_geometry = Inkscape::UI::get_monitor_geometry_at_surface(win->get_surface());
            int monitor_width =  monitor_geometry.get_width();
            int monitor_height = monitor_geometry.get_height();
            int window_width = win->get_width();
            int window_height = win->get_height();
            if (window_width > monitor_width || window_height > monitor_height) {
                w = std::min(monitor_width, window_width);
                h = std::min(monitor_height, window_height);
            }
        }
        if (w > 0 && h > 0) {
            desktop->setWindowSize({w, h});
        }
    }
 
    // Cancel any history of transforms up to this point (must be before call to zoom).
    desktop->clear_transform_history();
}
 
/*
 * Restores zoom and view from the document settings
 */
void sp_namedview_zoom_and_view_from_document(SPDesktop *desktop)
{
    SPNamedView *nv = desktop->getNamedView();
    if (nv->zoom != 0 && nv->zoom != HUGE_VAL && !std::isnan(nv->zoom)
        && nv->cx != HUGE_VAL && !std::isnan(nv->cx)
        && nv->cy != HUGE_VAL && !std::isnan(nv->cy)) {
        desktop->zoom_absolute( Geom::Point(nv->cx, nv->cy), nv->zoom, false );
    } else if (auto document = desktop->getDocument()) {
        // document without saved zoom, zoom to its page
        document->getPageManager().zoomToSelectedPage(desktop);
    }
    if (nv->rotation != 0 && nv->rotation != HUGE_VAL && !std::isnan(nv->rotation)) {
        Geom::Point p;
        if (nv->cx != HUGE_VAL && !std::isnan(nv->cx) && nv->cy != HUGE_VAL && !std::isnan(nv->cy)) {
            p = Geom::Point(nv->cx, nv->cy);
        }else{
            p = desktop->current_center();
        }
        desktop->rotate_absolute_keep_point(p, nv->rotation * M_PI / 180.0);
    }
}
 
void sp_namedview_update_layers_from_document (SPDesktop *desktop)
{
    SPObject *layer = nullptr;
    SPDocument *document = desktop->doc();
    SPNamedView *nv = desktop->getNamedView();
    if ( nv->default_layer_id != 0 ) {
        layer = document->getObjectById(g_quark_to_string(nv->default_layer_id));
    }
    // don't use that object if it's not at least group
    if ( !layer || !is<SPGroup>(layer) ) {
        layer = nullptr;
    }
    // if that didn't work out, look for the topmost layer
    if (!layer) {
        for (auto& iter: document->getRoot()->children) {
            if (desktop->layerManager().isLayer(&iter)) {
                layer = &iter;
            }
        }
    }
    if (layer) {
        desktop->layerManager().setCurrentLayer(layer);
    }
 
    // FIXME: find a better place to do this
    document->get_event_log()->updateUndoVerbs();
}
 
void sp_namedview_document_from_window(SPDesktop *desktop)
{
    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
    int window_geometry = prefs->getInt("/options/savewindowgeometry/value", PREFS_WINDOW_GEOMETRY_NONE);
    bool save_geometry_in_file = window_geometry == PREFS_WINDOW_GEOMETRY_FILE;
    bool save_viewport_in_file = prefs->getBool("/options/savedocviewport/value", true);
    Inkscape::XML::Node *view = desktop->getNamedView()->getRepr();
 
    // saving window geometry is not undoable
    DocumentUndo::ScopedInsensitive _no_undo(desktop->getDocument());
 
    if (save_viewport_in_file) {
        view->setAttributeSvgDouble("inkscape:zoom", desktop->current_zoom());
        double rotation = std::round(Geom::deg_from_rad(desktop->current_rotation().angle()));
        view->setAttributeSvgNonDefaultDouble("inkscape:rotation", rotation, 0.0);
        Geom::Point center = desktop->current_center();
        view->setAttributeSvgDouble("inkscape:cx", center.x());
        view->setAttributeSvgDouble("inkscape:cy", center.y());
    }
 
    if (save_geometry_in_file) {
        auto const [w, h] = desktop->getWindowSize();
        view->setAttributeInt("inkscape:window-width", w);
        view->setAttributeInt("inkscape:window-height", h);
        view->setAttributeInt("inkscape:window-maximized", desktop->is_maximized());
    }
 
    view->setAttribute("inkscape:current-layer", desktop->layerManager().currentLayer()->getId());
}
 
void SPNamedView::hide(SPDesktop const *desktop)
{
    g_assert(desktop != nullptr);
    g_assert(std::find(views.begin(),views.end(),desktop)!=views.end());
    for (auto guide : guides) {
        guide->hideSPGuide(desktop->getCanvas());
    }
    for (auto grid : grids) {
        grid->hide(desktop);
    }
    _viewport->remove(desktop->getCanvas());
    for (auto page : document->getPageManager().getPages()) {
        page->hidePage(desktop->getCanvas());
    }
    views.erase(std::remove(views.begin(),views.end(),desktop),views.end());
}
 
void SPNamedView::setDefaultAttribute(std::string attribute, std::string preference, std::string fallback)
{
    if (!getAttribute(attribute.c_str())) {
        std::string value = "";
        if (!preference.empty()) {
            value = Preferences::get()->getString(preference);
        }
        if (value.empty() && !fallback.empty()) {
            value = fallback;
        }
        if (!value.empty()) {
            setAttribute(attribute, value);
        }
    }
}
 
void SPNamedView::activateGuides(void* desktop, bool active)
{
    g_assert(desktop != nullptr);
    g_assert(std::find(views.begin(),views.end(),desktop)!=views.end());
 
    SPDesktop *dt = static_cast<SPDesktop*>(desktop);
    for(auto & guide : guides) {
        guide->sensitize(dt->getCanvas(), active);
    }
}
 
gchar const *SPNamedView::getName() const
{
    return getAttribute("id");
}
 
std::vector<SPDesktop *> const SPNamedView::getViewList() const
{
    return views;
}
 
void SPNamedView::toggleShowGuides()
{
    setShowGuides(!getShowGuides());
}
 
void SPNamedView::toggleLockGuides()
{
    setLockGuides(!getLockGuides());
}
 
void SPNamedView::toggleShowGrids()
{
    setShowGrids(!getShowGrids());
}
 
void SPNamedView::setShowGrids(bool v)
{
    {
        DocumentUndo::ScopedInsensitive ice(document);
 
        if (v && grids.empty())
            SPGrid::create_new(document, getRepr(), GridType::RECTANGULAR);
 
        getRepr()->setAttributeBoolean("showgrid", v);
    }
    requestModified(SP_OBJECT_MODIFIED_FLAG);
}
 
bool SPNamedView::getShowGrids()
{
    return grids_visible;
}
 
void SPNamedView::setShowGuides(bool v)
{
    if (auto repr = getRepr()) {
        {
            DocumentUndo::ScopedInsensitive _no_undo(document);
            repr->setAttributeBoolean("showguides", v);
        }
        requestModified(SP_OBJECT_MODIFIED_FLAG);
    }
}
 
void SPNamedView::setLockGuides(bool v)
{
    if (auto repr = getRepr()) {
        {
            DocumentUndo::ScopedInsensitive _no_undo(document);
            repr->setAttributeBoolean("inkscape:lockguides", v);
        }
        requestModified(SP_OBJECT_MODIFIED_FLAG);
    }
}
 
void SPNamedView::setShowGuideSingle(SPGuide *guide)
{
    if (getShowGuides())
        guide->showSPGuide();
    else
        guide->hideSPGuide();
}
 
bool SPNamedView::getShowGuides()
{
    if (auto repr = getRepr()) {
        // show guides if not specified, for backwards compatibility
        return repr->getAttributeBoolean("showguides", true);
    }
 
    return false;
}
 
bool SPNamedView::getLockGuides()
{
    if (auto repr = getRepr()) {
        return repr->getAttributeBoolean("inkscape:lockguides");
    }
 
    return false;
}
 
void SPNamedView::newGridCreated() {
    if (grids_visible) return;
 
    _sync_grids = false;
    setShowGrids(true);
    _sync_grids = true;
}
 
void SPNamedView::updateGrids()
{
    if (auto saction = std::dynamic_pointer_cast<Gio::SimpleAction>(
                document->getActionGroup()->lookup_action("show-grids"))) {
 
        saction->change_state(getShowGrids());
    }
    if (_sync_grids) {
        DocumentUndo::ScopedInsensitive ice(document);
        for (auto grid : grids) {
            grid->setVisible(getShowGrids());
        }
    }
}
 
void SPNamedView::updateGuides()
{
    bool const shown = getShowGuides();
    bool const locked = getLockGuides();
 
    if (auto saction = std::dynamic_pointer_cast<Gio::SimpleAction>(
                document->getActionGroup()->lookup_action("show-all-guides")))
    {
        saction->set_state(Glib::Variant<bool>::create(shown));
    }
 
    if (auto saction = std::dynamic_pointer_cast<Gio::SimpleAction>(
                document->getActionGroup()->lookup_action("lock-all-guides")))
    {
        saction->set_state(Glib::Variant<bool>::create(locked));
    }
 
    for (auto guide : guides) {
        setShowGuideSingle(guide);
        guide->set_locked(locked, true);
    }
}
 
Inkscape::Util::Unit const * SPNamedView::getDisplayUnit() const
{
    return display_units ? display_units : UnitTable::get().getUnit("px");
}
 
void SPNamedView::setDisplayUnit(std::string unit)
{
    setDisplayUnit(UnitTable::get().getUnit(unit));
}
 
void SPNamedView::setDisplayUnit(Inkscape::Util::Unit const *unit)
{
    // If this is unset, it will be returned as px by getDisplayUnit
    display_units = unit;
    getRepr()->setAttributeOrRemoveIfEmpty("inkscape:document-units",
                                           unit ? unit->abbr.c_str() : nullptr);
}
 
SPGrid *SPNamedView::getFirstEnabledGrid()
{
    for (auto grid : grids) {
        if (grid->isEnabled())
            return grid;
    }
 
    return nullptr;
}
 
void SPNamedView::translateGuides(Geom::Translate const &tr) {
    for(auto & it : guides) {
        SPGuide &guide = *it;
        Geom::Point point_on_line = guide.getPoint();
        point_on_line *= tr;
        guide.moveto(point_on_line, true);
    }
}
 
void SPNamedView::translateGrids(Geom::Translate const &tr) {
    auto scale = document->getDocumentScale();
    for (auto grid : grids) {
        grid->setOrigin( grid->getOrigin() * scale * tr * scale.inverse());
    }
}
 
void SPNamedView::scrollAllDesktops(double dx, double dy) {
    for(auto & view : views) {
        view->scroll_relative_in_svg_coords(dx, dy);
    }
}
 
void SPNamedView::change_color(SPAttr color_key, SPAttr opacity_key, Inkscape::Colors::Color const &color) {
    if (color.hasOpacity())
        getRepr()->setAttributeCssDouble(sp_attribute_name(opacity_key), color.getOpacity());
    getRepr()->setAttribute(sp_attribute_name(color_key), color.toString(false));
}
 
void SPNamedView::change_bool_setting(SPAttr key, bool value) {
    const char* str_value = nullptr;
    if (key == SPAttr::SHAPE_RENDERING) {
        str_value = value ? "auto" : "crispEdges";
    } else if (key == SPAttr::PAGELABELSTYLE) {
        str_value = value ? "below" : "default";
    } else {
        str_value = value ? "true" : "false";
    }
    getRepr()->setAttribute(sp_attribute_name(key), str_value);
}
 
// show/hide guide lines without modifying view; used to quickly and temporarily hide them and restore them
void SPNamedView::temporarily_show_guides(bool show) {
    // hide grid and guides
    for (auto guide : guides) {
        show ? guide->showSPGuide() : guide->hideSPGuide();
    }
 
    // hide page margin and bleed lines
    for (auto page : document->getPageManager().getPages()) {
        page->set_guides_visible(show);
    }
}
 
void SPNamedView::set_origin_follows_page(bool on) {
    if (auto repr = getRepr()) {
        repr->setAttributeBoolean("origin-correction", on);
        requestModified(SP_OBJECT_MODIFIED_FLAG);
    }
}
 
void SPNamedView::set_y_axis_down(bool down) {
    if (auto repr = getRepr()) {
        repr->setAttributeBoolean("y-axis-down", down);
        requestModified(SP_OBJECT_MODIFIED_FLAG);
    }
}
 
void SPNamedView::fix_guidelines() {
    for (auto guide : guides) {
        guide->fix_orientation();
    }
}
 
/*
  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 :