Adding upstream version 1.3+ds.upstream/1.3+dsupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1223 insertions, 0 deletions

diff --git a/src/ui/widget/stroke-style.cpp b/src/ui/widget/stroke-style.cpp
new file mode 100644
index 0000000..9233586
--- /dev/null
+++ b/src/ui/widget/stroke-style.cpp
@@ -0,0 +1,1223 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Authors:
+ *   Lauris Kaplinski <lauris@kaplinski.com>
+ *   Bryce Harrington <brycehar@bryceharrington.org>
+ *   bulia byak <buliabyak@users.sf.net>
+ *   Maximilian Albert <maximilian.albert@gmail.com>
+ *   Josh Andler <scislac@users.sf.net>
+ *   Jon A. Cruz <jon@joncruz.org>
+ *   Abhishek Sharma
+ *
+ * Copyright (C) 2001-2005 authors
+ * Copyright (C) 2001 Ximian, Inc.
+ * Copyright (C) 2004 John Cliff
+ * Copyright (C) 2008 Maximilian Albert (gtkmm-ification)
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include "stroke-style.h"
+
+#include "object/sp-marker.h"
+#include "object/sp-namedview.h"
+#include "object/sp-rect.h"
+#include "object/sp-stop.h"
+#include "object/sp-text.h"
+
+#include "svg/svg-color.h"
+
+#include "ui/icon-loader.h"
+#include "ui/widget/dash-selector.h"
+#include "ui/widget/marker-combo-box.h"
+#include "ui/widget/unit-menu.h"
+#include "ui/tools/marker-tool.h"
+#include "ui/dialog/dialog-base.h"
+
+#include "actions/actions-tools.h"
+
+#include "widgets/style-utils.h"
+
+using Inkscape::DocumentUndo;
+using Inkscape::Util::unit_table;
+
+/**
+ * Extract the actual name of the link
+ * e.g. get mTriangle from url(#mTriangle).
+ * \return Buffer containing the actual name, allocated from GLib;
+ * the caller should free the buffer when they no longer need it.
+ */
+SPObject* getMarkerObj(gchar const *n, SPDocument *doc)
+{
+    gchar const *p = n;
+    while (*p != '\0' && *p != '#') {
+        p++;
+    }
+
+    if (*p == '\0' || p[1] == '\0') {
+        return nullptr;
+    }
+
+    p++;
+    int c = 0;
+    while (p[c] != '\0' && p[c] != ')') {
+        c++;
+    }
+
+    if (p[c] == '\0') {
+        return nullptr;
+    }
+
+    gchar* b = g_strdup(p);
+    b[c] = '\0';
+
+    // FIXME: get the document from the object and let the caller pass it in
+    SPObject *marker = doc->getObjectById(b);
+
+    g_free(b);
+    return marker;
+}
+
+namespace Inkscape {
+namespace UI {
+namespace Widget {
+
+/**
+ * Construct a stroke-style radio button with a given icon
+ *
+ * \param[in] grp          The Gtk::RadioButtonGroup to which to add the new button
+ * \param[in] icon         The icon to use for the button
+ * \param[in] button_type  The type of stroke-style radio button (join/cap)
+ * \param[in] stroke_style The style attribute to associate with the button
+ */
+StrokeStyle::StrokeStyleButton::StrokeStyleButton(Gtk::RadioButtonGroup &grp,
+                                                  char const            *icon,
+                                                  StrokeStyleButtonType  button_type,
+                                                  gchar const           *stroke_style)
+    : 
+        Gtk::RadioButton(grp),
+        button_type(button_type),
+        stroke_style(stroke_style)
+{
+    show();
+    set_mode(false);
+
+    auto px = Gtk::manage(sp_get_icon_image(icon, Gtk::ICON_SIZE_LARGE_TOOLBAR));
+    g_assert(px != nullptr);
+    px->show();
+    add(*px);
+}
+
+std::vector<double> parse_pattern(const Glib::ustring& input) {
+    std::vector<double> output;
+    if (input.empty()) return output;
+
+    std::istringstream stream(input.c_str());
+    while (stream) {
+        double val;
+        stream >> val;
+        if (stream) {
+            output.push_back(val);
+        }
+    }
+
+    return output;
+}
+
+StrokeStyle::StrokeStyle() :
+    Gtk::Box(),
+    miterLimitSpin(),
+    widthSpin(),
+    unitSelector(),
+    joinMiter(),
+    joinRound(),
+    joinBevel(),
+    capButt(),
+    capRound(),
+    capSquare(),
+    dashSelector(),
+    update(false),
+    desktop(nullptr),
+    startMarkerConn(),
+    midMarkerConn(),
+    endMarkerConn(),
+    _old_unit(nullptr)
+{
+    set_name("StrokeSelector");
+    table = Gtk::manage(new Gtk::Grid());
+    table->set_border_width(4);
+    table->set_row_spacing(4);
+    table->set_hexpand(false);
+    table->set_halign(Gtk::ALIGN_CENTER);
+    table->show();
+    add(*table);
+
+    Gtk::Box *hb;
+    gint i = 0;
+
+    //spw_label(t, C_("Stroke width", "_Width:"), 0, i);
+
+    hb = spw_hbox(table, 3, 1, i);
+
+// TODO: when this is gtkmmified, use an Inkscape::UI::Widget::ScalarUnit instead of the separate
+// spinbutton and unit selector for stroke width. In sp_stroke_style_line_update, use
+// setHundredPercent to remember the averaged width corresponding to 100%. Then the
+// stroke_width_set_unit will be removed (because ScalarUnit takes care of conversions itself)
+    widthAdj = new Glib::RefPtr<Gtk::Adjustment>(Gtk::Adjustment::create(1.0, 0.0, 1000.0, 0.1, 10.0, 0.0));
+    widthSpin = new Inkscape::UI::Widget::SpinButton(*widthAdj, 0.1, 3);
+    widthSpin->set_tooltip_text(_("Stroke width"));
+    widthSpin->show();
+    spw_label(table, C_("Stroke width", "_Width:"), 0, i, widthSpin);
+
+    sp_dialog_defocus_on_enter_cpp(widthSpin);
+
+    hb->pack_start(*widthSpin, false, false, 0);
+    unitSelector = Gtk::manage(new Inkscape::UI::Widget::UnitMenu());
+    unitSelector->setUnitType(Inkscape::Util::UNIT_TYPE_LINEAR);
+    SPDesktop *desktop = SP_ACTIVE_DESKTOP;
+
+    unitSelector->addUnit(*unit_table.getUnit("%"));
+    unitSelector->append("hairline", _("Hairline"));
+    _old_unit = unitSelector->getUnit();
+    if (desktop) {
+        unitSelector->setUnit(desktop->getNamedView()->display_units->abbr);
+        _old_unit = desktop->getNamedView()->display_units;
+    }
+    widthSpin->setUnitMenu(unitSelector);
+    unitSelector->signal_changed().connect(sigc::mem_fun(*this, &StrokeStyle::unitChangedCB));
+    unitSelector->show();
+
+    hb->pack_start(*unitSelector, FALSE, FALSE, 0);
+    (*widthAdj)->signal_value_changed().connect(sigc::mem_fun(*this, &StrokeStyle::setStrokeWidth));
+
+    i++;
+
+    /* Dash */
+    spw_label(table, _("Dashes:"), 0, i, nullptr); //no mnemonic for now
+                                            //decide what to do:
+                                            //   implement a set_mnemonic_source function in the
+                                            //   Inkscape::UI::Widget::DashSelector class, so that we do not have to
+                                            //   expose any of the underlying widgets?
+    dashSelector = Gtk::manage(new Inkscape::UI::Widget::DashSelector);
+    _pattern = Gtk::make_managed<Gtk::Entry>();
+
+    dashSelector->show();
+    dashSelector->set_hexpand();
+    dashSelector->set_halign(Gtk::ALIGN_FILL);
+    dashSelector->set_valign(Gtk::ALIGN_CENTER);
+    table->attach(*dashSelector, 1, i, 3, 1);
+    dashSelector->changed_signal.connect(sigc::mem_fun(*this, &StrokeStyle::setStrokeDash));
+
+    i++;
+
+    table->attach(*_pattern, 1, i, 4, 1);
+    _pattern_label = spw_label(table, _("_Pattern:"), 0, i, _pattern);
+    _pattern_label->set_tooltip_text(_("Repeating \"dash gap ...\" pattern"));
+    _pattern->set_no_show_all();
+    _pattern_label->set_no_show_all();
+    _pattern->signal_changed().connect([=](){
+        if (update || _editing_pattern) return;
+
+        auto pat = parse_pattern(_pattern->get_text());
+        _editing_pattern = true;
+        update = true;
+        dashSelector->set_dash(pat, dashSelector->get_offset());
+        update = false;
+        setStrokeDash();
+        _editing_pattern = false;
+    });
+    update_pattern(0, nullptr);
+
+    i++;
+
+    /* Drop down marker selectors*/
+    // TRANSLATORS: Path markers are an SVG feature that allows you to attach arbitrary shapes
+    // (arrowheads, bullets, faces, whatever) to the start, end, or middle nodes of a path.
+
+    spw_label(table, _("Markers:"), 0, i, nullptr);
+
+    hb = spw_hbox(table, 1, 1, i);
+    i++;
+
+    startMarkerCombo = Gtk::manage(new MarkerComboBox("marker-start", SP_MARKER_LOC_START));
+    startMarkerCombo->set_tooltip_text(_("Start Markers are drawn on the first node of a path or shape"));
+    startMarkerConn = startMarkerCombo->signal_changed().connect([=]() { markerSelectCB(startMarkerCombo, SP_MARKER_LOC_START); });
+    startMarkerCombo->edit_signal.connect([=] { enterEditMarkerMode(SP_MARKER_LOC_START); });
+    startMarkerCombo->show();
+
+    hb->pack_start(*startMarkerCombo, true, true, 0);
+
+    midMarkerCombo = Gtk::manage(new MarkerComboBox("marker-mid", SP_MARKER_LOC_MID));
+    midMarkerCombo->set_tooltip_text(_("Mid Markers are drawn on every node of a path or shape except the first and last nodes"));
+    midMarkerConn = midMarkerCombo->signal_changed().connect([=]() { markerSelectCB(midMarkerCombo, SP_MARKER_LOC_MID); });
+    midMarkerCombo->edit_signal.connect([=] { enterEditMarkerMode(SP_MARKER_LOC_MID); });
+    midMarkerCombo->show();
+
+    hb->pack_start(*midMarkerCombo, true, true, 0);
+
+    endMarkerCombo = Gtk::manage(new MarkerComboBox("marker-end", SP_MARKER_LOC_END));
+    endMarkerCombo->set_tooltip_text(_("End Markers are drawn on the last node of a path or shape"));
+    endMarkerConn = endMarkerCombo->signal_changed().connect([=]() { markerSelectCB(endMarkerCombo, SP_MARKER_LOC_END); });
+    endMarkerCombo->edit_signal.connect([=] { enterEditMarkerMode(SP_MARKER_LOC_END); });
+    endMarkerCombo->show();
+
+    hb->pack_start(*endMarkerCombo, true, true, 0);
+    i++;
+
+    /* Join type */
+    // TRANSLATORS: The line join style specifies the shape to be used at the
+    //  corners of paths. It can be "miter", "round" or "bevel".
+    spw_label(table, _("Join:"), 0, i, nullptr);
+
+    hb = spw_hbox(table, 3, 1, i);
+
+    Gtk::RadioButtonGroup joinGrp;
+
+    joinBevel = makeRadioButton(joinGrp, INKSCAPE_ICON("stroke-join-bevel"),
+                                hb, STROKE_STYLE_BUTTON_JOIN, "bevel");
+
+    // TRANSLATORS: Bevel join: joining lines with a blunted (flattened) corner.
+    //  For an example, draw a triangle with a large stroke width and modify the
+    //  "Join" option (in the Fill and Stroke dialog).
+    joinBevel->set_tooltip_text(_("Bevel join"));
+
+    joinRound = makeRadioButton(joinGrp, INKSCAPE_ICON("stroke-join-round"),
+                                hb, STROKE_STYLE_BUTTON_JOIN, "round");
+
+    // TRANSLATORS: Round join: joining lines with a rounded corner.
+    //  For an example, draw a triangle with a large stroke width and modify the
+    //  "Join" option (in the Fill and Stroke dialog).
+    joinRound->set_tooltip_text(_("Round join"));
+
+    joinMiter = makeRadioButton(joinGrp, INKSCAPE_ICON("stroke-join-miter"),
+                                hb, STROKE_STYLE_BUTTON_JOIN, "miter");
+
+    // TRANSLATORS: Miter join: joining lines with a sharp (pointed) corner.
+    //  For an example, draw a triangle with a large stroke width and modify the
+    //  "Join" option (in the Fill and Stroke dialog).
+    joinMiter->set_tooltip_text(_("Miter join"));
+
+    /* Miterlimit  */
+    // TRANSLATORS: Miter limit: only for "miter join", this limits the length
+    //  of the sharp "spike" when the lines connect at too sharp an angle.
+    // When two line segments meet at a sharp angle, a miter join results in a
+    //  spike that extends well beyond the connection point. The purpose of the
+    //  miter limit is to cut off such spikes (i.e. convert them into bevels)
+    //  when they become too long.
+    //spw_label(t, _("Miter _limit:"), 0, i);
+    miterLimitAdj = new Glib::RefPtr<Gtk::Adjustment>(Gtk::Adjustment::create(4.0, 0.0, 100000.0, 0.1, 10.0, 0.0));
+    miterLimitSpin = new Inkscape::UI::Widget::SpinButton(*miterLimitAdj, 0.1, 2);
+    miterLimitSpin->set_tooltip_text(_("Maximum length of the miter (in units of stroke width)"));
+    miterLimitSpin->set_width_chars(6);
+    miterLimitSpin->show();
+    sp_dialog_defocus_on_enter_cpp(miterLimitSpin);
+
+    hb->pack_start(*miterLimitSpin, false, false, 0);
+    (*miterLimitAdj)->signal_value_changed().connect(sigc::mem_fun(*this, &StrokeStyle::setStrokeMiter));
+    i++;
+
+    /* Cap type */
+    // TRANSLATORS: cap type specifies the shape for the ends of lines
+    //spw_label(t, _("_Cap:"), 0, i);
+    spw_label(table, _("Cap:"), 0, i, nullptr);
+
+    hb = spw_hbox(table, 3, 1, i);
+
+    Gtk::RadioButtonGroup capGrp;
+
+    capButt = makeRadioButton(capGrp, INKSCAPE_ICON("stroke-cap-butt"),
+                                hb, STROKE_STYLE_BUTTON_CAP, "butt");
+
+    // TRANSLATORS: Butt cap: the line shape does not extend beyond the end point
+    //  of the line; the ends of the line are square
+    capButt->set_tooltip_text(_("Butt cap"));
+
+    capRound = makeRadioButton(capGrp, INKSCAPE_ICON("stroke-cap-round"),
+                                hb, STROKE_STYLE_BUTTON_CAP, "round");
+
+    // TRANSLATORS: Round cap: the line shape extends beyond the end point of the
+    //  line; the ends of the line are rounded
+    capRound->set_tooltip_text(_("Round cap"));
+
+    capSquare = makeRadioButton(capGrp, INKSCAPE_ICON("stroke-cap-square"),
+                                hb, STROKE_STYLE_BUTTON_CAP, "square");
+
+    // TRANSLATORS: Square cap: the line shape extends beyond the end point of the
+    //  line; the ends of the line are square
+    capSquare->set_tooltip_text(_("Square cap"));
+
+    i++;
+
+    /* Paint order */
+    // TRANSLATORS: Paint order determines the order the 'fill', 'stroke', and 'markers are painted.
+    spw_label(table, _("Order:"), 0, i, nullptr);
+
+    hb = spw_hbox(table, 4, 1, i);
+
+    Gtk::RadioButtonGroup paintOrderGrp;
+
+    paintOrderFSM = makeRadioButton(paintOrderGrp, INKSCAPE_ICON("paint-order-fsm"),
+                                    hb, STROKE_STYLE_BUTTON_ORDER, "normal");
+    paintOrderFSM->set_tooltip_text(_("Fill, Stroke, Markers")); 
+
+    paintOrderSFM = makeRadioButton(paintOrderGrp, INKSCAPE_ICON("paint-order-sfm"),
+                                    hb, STROKE_STYLE_BUTTON_ORDER, "stroke fill markers");
+    paintOrderSFM->set_tooltip_text(_("Stroke, Fill, Markers")); 
+
+    paintOrderFMS = makeRadioButton(paintOrderGrp, INKSCAPE_ICON("paint-order-fms"),
+                                    hb, STROKE_STYLE_BUTTON_ORDER, "fill markers stroke");
+    paintOrderFMS->set_tooltip_text(_("Fill, Markers, Stroke")); 
+
+    i++;
+
+    hb = spw_hbox(table, 4, 1, i);
+
+    paintOrderMFS = makeRadioButton(paintOrderGrp, INKSCAPE_ICON("paint-order-mfs"),
+                                    hb, STROKE_STYLE_BUTTON_ORDER, "markers fill stroke");
+    paintOrderMFS->set_tooltip_text(_("Markers, Fill, Stroke")); 
+
+    paintOrderSMF = makeRadioButton(paintOrderGrp, INKSCAPE_ICON("paint-order-smf"),
+                                    hb, STROKE_STYLE_BUTTON_ORDER, "stroke markers fill");
+    paintOrderSMF->set_tooltip_text(_("Stroke, Markers, Fill")); 
+
+    paintOrderMSF = makeRadioButton(paintOrderGrp, INKSCAPE_ICON("paint-order-msf"),
+                                    hb, STROKE_STYLE_BUTTON_ORDER, "markers stroke fill");
+    paintOrderMSF->set_tooltip_text(_("Markers, Stroke, Fill")); 
+
+    i++;
+}
+
+StrokeStyle::~StrokeStyle()
+{
+}
+
+void StrokeStyle::setDesktop(SPDesktop *desktop)
+{
+    if (this->desktop != desktop) {
+
+        if (this->desktop) {
+            _document_replaced_connection.disconnect();
+        }
+        this->desktop = desktop;
+
+        if (!desktop) {
+            return;
+        }
+
+        _document_replaced_connection =
+            desktop->connectDocumentReplaced(sigc::mem_fun(*this, &StrokeStyle::_handleDocumentReplaced));
+
+        _handleDocumentReplaced(nullptr, desktop->getDocument());
+
+        updateLine();
+    }
+}
+
+void StrokeStyle::_handleDocumentReplaced(SPDesktop *, SPDocument *document)
+{
+    for (MarkerComboBox *combo : { startMarkerCombo, midMarkerCombo, endMarkerCombo }) {
+        combo->setDocument(document);
+    }
+}
+
+
+/**
+ * Helper function for creating stroke-style radio buttons.
+ *
+ * \param[in] grp           The Gtk::RadioButtonGroup in which to add the button
+ * \param[in] icon          The icon for the button
+ * \param[in] hb            The Gtk::Box container in which to add the button
+ * \param[in] button_type   The type (join/cap) for the button
+ * \param[in] stroke_style  The style attribute to associate with the button
+ *
+ * \details After instantiating the button, it is added to a container box and
+ *          a handler for the toggle event is connected.
+ */
+StrokeStyle::StrokeStyleButton *
+StrokeStyle::makeRadioButton(Gtk::RadioButtonGroup &grp,
+                             char const            *icon,
+                             Gtk::Box              *hb,
+                             StrokeStyleButtonType  button_type,
+                             gchar const           *stroke_style)
+{
+    g_assert(icon != nullptr);
+    g_assert(hb  != nullptr);
+
+    StrokeStyleButton *tb = new StrokeStyleButton(grp, icon, button_type, stroke_style);
+
+    hb->pack_start(*tb, false, false, 0);
+
+    tb->signal_toggled().connect(sigc::bind<StrokeStyleButton *, StrokeStyle *>(
+                                     sigc::ptr_fun(&StrokeStyle::buttonToggledCB), tb, this));
+
+    return tb;
+}
+
+void StrokeStyle::enterEditMarkerMode(SPMarkerLoc _editMarkerMode)
+{
+    SPDesktop *desktop = this->desktop;
+
+    if (desktop) {
+        set_active_tool(desktop, "Marker");
+        Inkscape::UI::Tools::MarkerTool *mt = dynamic_cast<Inkscape::UI::Tools::MarkerTool*>(desktop->event_context);
+
+        if(mt) {
+            mt->editMarkerMode = _editMarkerMode;
+            mt->selection_changed(desktop->getSelection());
+        }
+    }
+}
+
+
+bool StrokeStyle::areMarkersBeingUpdated()
+{
+    return startMarkerCombo->in_update() || midMarkerCombo->in_update() || endMarkerCombo->in_update();
+}
+
+/**
+ * Handles when user selects one of the markers from the marker combobox.
+ * Gets the marker uri string and applies it to all selected
+ * items in the current desktop.
+ */
+void StrokeStyle::markerSelectCB(MarkerComboBox *marker_combo, SPMarkerLoc const which)
+{
+    if (update || areMarkersBeingUpdated()) {
+        return;
+    }
+
+    SPDocument *document = desktop->getDocument();
+    if (!document) {
+        return;
+    }
+
+    // Get marker ID; could be empty (to remove marker)
+    std::string marker = marker_combo->get_active_marker_uri();
+
+    update = true;
+
+    SPCSSAttr *css = sp_repr_css_attr_new();
+    gchar const *combo_id = marker_combo->get_id();
+    sp_repr_css_set_property(css, combo_id, marker.c_str());
+
+    for (auto item : desktop->getSelection()->items()) {
+        if (!is<SPShape>(item)) {
+            continue;
+        }
+        if (Inkscape::XML::Node* selrepr = item->getRepr()) {
+            sp_repr_css_change_recursive(selrepr, css, "style");
+        }
+
+        item->requestModified(SP_OBJECT_MODIFIED_FLAG);
+        item->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
+        // perform update to make sure any previously referenced markers are released,
+        // so they can be collected by DocumentUndo::done collect orphans
+        document->ensureUpToDate();
+
+        DocumentUndo::done(document, _("Set markers"), INKSCAPE_ICON("dialog-fill-and-stroke"));
+    }
+
+    // edit marker mode - update
+    if (auto mt = dynamic_cast<Inkscape::UI::Tools::MarkerTool*>(desktop->event_context)) {
+        mt->editMarkerMode = which;
+        mt->selection_changed(desktop->getSelection());
+    }
+
+    sp_repr_css_attr_unref(css);
+    css = nullptr;
+
+    update = false;
+};
+
+/**
+ * Callback for when UnitMenu widget is modified.
+ * Triggers update action.
+ */
+void StrokeStyle::unitChangedCB()
+{
+    Inkscape::Util::Unit const *new_unit = unitSelector->getUnit();
+
+    if (_old_unit == new_unit)
+        return;
+
+    // If the unit selector is set to hairline, don't do the normal conversion.
+    if (isHairlineSelected()) {
+        // Force update in setStrokeWidth
+        _old_unit = new_unit;
+        _last_width = -1;
+        setStrokeWidth();
+        return;
+    }
+
+    if (new_unit->type == Inkscape::Util::UNIT_TYPE_DIMENSIONLESS) {
+        // Prevent update in setStrokeWidth
+        _last_width = 100.0;
+        widthSpin->set_value(100);
+    } else {
+        // Remove the non-scaling-stroke effect and the hairline extensions
+        if (!update) {
+            SPCSSAttr *css = sp_repr_css_attr_new();
+            sp_repr_css_unset_property(css, "vector-effect");
+            sp_repr_css_unset_property(css, "-inkscape-stroke");
+            sp_desktop_set_style(desktop, css);
+            sp_repr_css_attr_unref(css);
+            css = nullptr;
+            DocumentUndo::done(desktop->getDocument(), _("Remove hairline stroke"),
+                INKSCAPE_ICON("dialog-fill-and-stroke"));
+        }
+        if (_old_unit->type == Inkscape::Util::UNIT_TYPE_DIMENSIONLESS) {
+            // Prevent update of unit (inf-loop) in updateLine
+            _old_unit = new_unit;
+            // Going from % to any other unit means our widthSpin is completely invalid.
+            updateLine();
+        } else {
+            // Scale the value and record the old_unit
+            widthSpin->set_value(Inkscape::Util::Quantity::convert(widthSpin->get_value(), _old_unit, new_unit));
+        }
+    }
+    _old_unit = new_unit;
+}
+
+/**
+ * Callback for when stroke style widget is modified.
+ * Triggers update action.
+ */
+void
+StrokeStyle::selectionModifiedCB(guint flags)
+{
+    // We care deeply about only updating when the style is updated
+    // if we update on other flags, we slow inkscape down when dragging
+    if (flags & (SP_OBJECT_STYLE_MODIFIED_FLAG)) {
+        updateLine();
+    }
+}
+
+/**
+ * Callback for when stroke style widget is changed.
+ * Triggers update action.
+ */
+void
+StrokeStyle::selectionChangedCB()
+{
+    updateLine();
+}
+
+/**
+ * Get a dash array and offset from the style.
+ *
+ * Both values are de-scaled by the style's width if needed.
+ */
+std::vector<double>
+StrokeStyle::getDashFromStyle(SPStyle *style, double &offset)
+{
+    auto prefs = Inkscape::Preferences::get();
+
+    std::vector<double> ret;
+    size_t len = style->stroke_dasharray.values.size();
+
+    double scaledash = 1.0;
+    if (prefs->getBool("/options/dash/scale", true) && style->stroke_width.computed) {
+        scaledash = style->stroke_width.computed;
+    }
+
+    offset = style->stroke_dashoffset.value / scaledash;
+    for (unsigned i = 0; i < len; i++) {
+        ret.push_back(style->stroke_dasharray.values[i].value / scaledash);
+    }
+    return ret;
+}
+
+/**
+ * Sets selector widgets' dash style from an SPStyle object.
+ */
+void
+StrokeStyle::setDashSelectorFromStyle(Inkscape::UI::Widget::DashSelector *dsel, SPStyle *style)
+{
+    double offset = 0;
+    auto d = getDashFromStyle(style, offset);
+    if (!d.empty()) {
+        dsel->set_dash(d, offset);
+        update_pattern(d.size(), d.data());
+    } else {
+        dsel->set_dash(std::vector<double>(), 0.0);
+        update_pattern(0, nullptr);
+    }
+}
+
+void StrokeStyle::update_pattern(int ndash, const double* pattern) {
+    if (_editing_pattern || _pattern->has_focus()) return;
+
+    std::ostringstream ost;
+    for (int i = 0; i < ndash; ++i) {
+        ost << pattern[i] << ' ';
+    }
+    _pattern->set_text(ost.str().c_str());
+    if (ndash > 0) {
+        _pattern_label->show();
+        _pattern->show();
+    }
+    else {
+        _pattern_label->hide();
+        _pattern->hide();
+    }
+}
+
+/**
+ * Sets the join type for a line, and updates the stroke style widget's buttons
+ */
+void
+StrokeStyle::setJoinType (unsigned const jointype)
+{
+    Gtk::RadioButton *tb = nullptr;
+    switch (jointype) {
+        case SP_STROKE_LINEJOIN_MITER:
+            tb = joinMiter;
+            break;
+        case SP_STROKE_LINEJOIN_ROUND:
+            tb = joinRound;
+            break;
+        case SP_STROKE_LINEJOIN_BEVEL:
+            tb = joinBevel;
+            break;
+        default:
+            // Should not happen
+            std::cerr << "StrokeStyle::setJoinType(): Invalid value: " << jointype << std::endl;
+            tb = joinMiter;
+            break;
+    }
+    setJoinButtons(tb);
+}
+
+/**
+ * Sets the cap type for a line, and updates the stroke style widget's buttons
+ */
+void
+StrokeStyle::setCapType (unsigned const captype)
+{
+    Gtk::RadioButton *tb = nullptr;
+    switch (captype) {
+        case SP_STROKE_LINECAP_BUTT:
+            tb = capButt;
+            break;
+        case SP_STROKE_LINECAP_ROUND:
+            tb = capRound;
+            break;
+        case SP_STROKE_LINECAP_SQUARE:
+            tb = capSquare;
+            break;
+        default:
+            // Should not happen
+            std::cerr << "StrokeStyle::setCapType(): Invalid value: " << captype << std::endl;
+            tb = capButt;
+            break;
+    }
+    setCapButtons(tb);
+}
+
+/**
+ * Sets the cap type for a line, and updates the stroke style widget's buttons
+ */
+void
+StrokeStyle::setPaintOrder (gchar const *paint_order)
+{
+    Gtk::RadioButton *tb = paintOrderFSM;
+
+    SPIPaintOrder temp;
+    temp.read( paint_order );
+
+    if (temp.layer[0] != SP_CSS_PAINT_ORDER_NORMAL) {
+
+        if (temp.layer[0] == SP_CSS_PAINT_ORDER_FILL) {
+            if (temp.layer[1] == SP_CSS_PAINT_ORDER_STROKE) {
+                tb = paintOrderFSM;
+            } else {
+                tb = paintOrderFMS;
+            }
+        } else if (temp.layer[0] == SP_CSS_PAINT_ORDER_STROKE) {
+            if (temp.layer[1] == SP_CSS_PAINT_ORDER_FILL) {
+                tb = paintOrderSFM;
+            } else {
+                tb = paintOrderSMF;
+            }
+        } else {
+            if (temp.layer[1] == SP_CSS_PAINT_ORDER_STROKE) {
+                tb = paintOrderMSF;
+            } else {
+                tb = paintOrderMFS;
+            }
+        }
+
+    }
+    setPaintOrderButtons(tb);
+}
+
+/**
+ * Callback for when stroke style widget is updated, including markers, cap type,
+ * join type, etc.
+ */
+void
+StrokeStyle::updateLine()
+{
+    if (update) {
+        return;
+    }
+
+    auto *widg = get_parent()->get_parent()->get_parent()->get_parent(); 
+    auto dialogbase = dynamic_cast<Inkscape::UI::Dialog::DialogBase*>(widg);
+    if (dialogbase && !dialogbase->getShowing()) {
+        return;
+    }
+
+    update = true;
+
+    Inkscape::Selection *sel = desktop ? desktop->getSelection() : nullptr;
+
+    if (!sel || sel->isEmpty()) {
+        // Nothing selected, grey-out all controls in the stroke-style dialog
+        table->set_sensitive(false);
+
+        update = false;
+
+        return;
+    }
+
+    FillOrStroke kind = STROKE;
+
+    // create temporary style
+    SPStyle query(SP_ACTIVE_DOCUMENT);
+    // query into it
+    int result_sw = sp_desktop_query_style(desktop, &query, QUERY_STYLE_PROPERTY_STROKEWIDTH);
+    int result_ml = sp_desktop_query_style(desktop, &query, QUERY_STYLE_PROPERTY_STROKEMITERLIMIT);
+    int result_cap = sp_desktop_query_style(desktop, &query, QUERY_STYLE_PROPERTY_STROKECAP);
+    int result_join = sp_desktop_query_style(desktop, &query, QUERY_STYLE_PROPERTY_STROKEJOIN);
+    int result_order = sp_desktop_query_style(desktop, &query, QUERY_STYLE_PROPERTY_PAINTORDER);
+
+    SPIPaint &targPaint = *query.getFillOrStroke(kind == FILL);
+
+    {
+        table->set_sensitive(true);
+        widthSpin->set_sensitive(true);
+
+        if (result_sw == QUERY_STYLE_MULTIPLE_AVERAGED) {
+            unitSelector->setUnit("%");
+        } else if (query.stroke_extensions.hairline) {
+            unitSelector->set_active_id("hairline");
+        } else {
+            // same width, or only one object; no sense to keep percent, switch to absolute
+            Inkscape::Util::Unit const *tempunit = unitSelector->getUnit();
+            if (tempunit->type != Inkscape::Util::UNIT_TYPE_LINEAR) {
+                unitSelector->setUnit(desktop->getNamedView()->display_units->abbr);
+            }
+        }
+
+        Inkscape::Util::Unit const *unit = unitSelector->getUnit();
+
+        if (query.stroke_extensions.hairline) {
+            widthSpin->set_sensitive(false);
+            (*widthAdj)->set_value(1);
+        } else if (unit->type == Inkscape::Util::UNIT_TYPE_LINEAR) {
+            double avgwidth = Inkscape::Util::Quantity::convert(query.stroke_width.computed, "px", unit);
+            (*widthAdj)->set_value(avgwidth);
+        } else {
+            (*widthAdj)->set_value(100);
+        }
+
+        // if none of the selected objects has a stroke, than quite some controls should be disabled
+        // These options should also be disabled for hairlines, since they don't make sense for
+        // 0-width lines.
+        // The markers might still be shown though, so marker and stroke-width widgets stay enabled
+        bool is_enabled = (result_sw != QUERY_STYLE_NOTHING) && !targPaint.isNoneSet()
+                           && !query.stroke_extensions.hairline;
+        joinMiter->set_sensitive(is_enabled);
+        joinRound->set_sensitive(is_enabled);
+        joinBevel->set_sensitive(is_enabled);
+
+        miterLimitSpin->set_sensitive(is_enabled);
+
+        capButt->set_sensitive(is_enabled);
+        capRound->set_sensitive(is_enabled);
+        capSquare->set_sensitive(is_enabled);
+
+        dashSelector->set_sensitive(is_enabled);
+        _pattern->set_sensitive(is_enabled);
+    }
+
+    if (result_ml != QUERY_STYLE_NOTHING)
+        (*miterLimitAdj)->set_value(query.stroke_miterlimit.value); // TODO: reflect averagedness?
+
+    using Inkscape::is_query_style_updateable;
+    if (! is_query_style_updateable(result_join)) {
+        setJoinType(query.stroke_linejoin.value);
+    } else {
+        setJoinButtons(nullptr);
+    }
+
+    if (! is_query_style_updateable(result_cap)) {
+        setCapType (query.stroke_linecap.value);
+    } else {
+        setCapButtons(nullptr);
+    }
+
+    if (! is_query_style_updateable(result_order)) {
+        setPaintOrder (query.paint_order.value);
+    } else {
+        setPaintOrder (nullptr);
+    }
+
+    std::vector<SPItem*> const objects(sel->items().begin(), sel->items().end());
+    if (objects.size()) {
+        SPObject *const object = objects[0];
+        SPStyle *const style = object->style;
+        /* Markers */
+        updateAllMarkers(objects, true); // FIXME: make this desktop query too
+
+        /* Dash */
+        setDashSelectorFromStyle(dashSelector, style); // FIXME: make this desktop query too
+    }
+    table->set_sensitive(true);
+
+    update = false;
+}
+
+/**
+ * Sets a line's dash properties in a CSS style object.
+ */
+void
+StrokeStyle::setScaledDash(SPCSSAttr *css,
+                                int ndash, const double *dash, double offset,
+                                double scale)
+{
+    if (ndash > 0) {
+        Inkscape::CSSOStringStream osarray;
+        for (int i = 0; i < ndash; i++) {
+            osarray << dash[i] * scale;
+            if (i < (ndash - 1)) {
+                osarray << ",";
+            }
+        }
+        sp_repr_css_set_property(css, "stroke-dasharray", osarray.str().c_str());
+
+        Inkscape::CSSOStringStream osoffset;
+        osoffset << offset * scale;
+        sp_repr_css_set_property(css, "stroke-dashoffset", osoffset.str().c_str());
+    } else {
+        sp_repr_css_set_property(css, "stroke-dasharray", "none");
+        sp_repr_css_set_property(css, "stroke-dashoffset", nullptr);
+    }
+}
+
+static inline double calcScaleLineWidth(const double width_typed, SPItem *const item, Inkscape::Util::Unit const *const unit)
+{
+    if (unit->abbr == "%") {
+        auto scale = item->i2doc_affine().descrim();;
+        const gdouble old_w = item->style->stroke_width.computed;
+        return (old_w * width_typed / 100) * scale;
+    } else if (unit->type == Inkscape::Util::UNIT_TYPE_LINEAR) {
+        return Inkscape::Util::Quantity::convert(width_typed, unit, "px");
+    }
+    return width_typed;
+}
+
+/**
+ * Set the stroke width and adjust the dash pattern if needed.
+ */
+void StrokeStyle::setStrokeWidth()
+{
+    double width_typed = (*widthAdj)->get_value();
+
+    // Don't change the selection if an update is happening,
+    // but also store the value for later comparison.
+    if (update || fabs(_last_width - width_typed) < 1E-6) {
+        _last_width = width_typed;
+        return;
+    }
+    update = true;
+
+    auto prefs = Inkscape::Preferences::get();
+    auto unit = unitSelector->getUnit();
+
+    SPCSSAttr *css = sp_repr_css_attr_new();
+    if (isHairlineSelected()) {
+        /* For renderers that don't understand -inkscape-stroke:hairline, fall back to 1px non-scaling */
+        width_typed = 1;
+        sp_repr_css_set_property(css, "vector-effect", "non-scaling-stroke");
+        sp_repr_css_set_property(css, "-inkscape-stroke", "hairline");
+    } else {
+        sp_repr_css_unset_property(css, "vector-effect");
+        sp_repr_css_unset_property(css, "-inkscape-stroke");
+    }
+
+    for (auto item : desktop->getSelection()->items()) {
+        const double width = calcScaleLineWidth(width_typed, item, unit);
+        sp_repr_css_set_property_double(css, "stroke-width", width);
+
+        if (prefs->getBool("/options/dash/scale", true)) {
+            // This will read the old stroke-width to un-scale the pattern.
+            double offset = 0;
+            auto dash = getDashFromStyle(item->style, offset);
+            setScaledDash(css, dash.size(), dash.data(), offset, width);
+        }
+        sp_desktop_apply_css_recursive (item, css, true);
+    }
+    sp_desktop_set_style (desktop, css, false);
+
+    sp_repr_css_attr_unref(css);
+    DocumentUndo::done(desktop->getDocument(), _("Set stroke width"),
+                       INKSCAPE_ICON("dialog-fill-and-stroke"));
+
+    if (unit->abbr == "%") {
+        // reset to 100 percent
+        _last_width = 100.0;
+        (*widthAdj)->set_value(100.0);
+    } else {
+        _last_width = width_typed;
+    }
+    update = false;
+}
+
+/**
+ * Set the stroke dash pattern, scale to the existing width if needed
+ */
+void StrokeStyle::setStrokeDash()
+{
+    if (update) return;
+    update = true;
+
+    auto document = desktop->getDocument();
+    auto prefs = Inkscape::Preferences::get();
+
+    double offset = 0;
+    const auto& dash = dashSelector->get_dash(&offset);
+    update_pattern(dash.size(), dash.data());
+
+    SPCSSAttr *css = sp_repr_css_attr_new();
+    for (auto item : desktop->getSelection()->items()) {
+        double scale = item->i2doc_affine().descrim();
+        if(prefs->getBool("/options/dash/scale", true)) {
+            scale = item->style->stroke_width.computed * scale;
+        }
+
+        setScaledDash(css, dash.size(), dash.data(), offset, scale);
+        sp_desktop_apply_css_recursive (item, css, true);
+    }
+    sp_desktop_set_style (desktop, css, false);
+
+    sp_repr_css_attr_unref(css);
+    DocumentUndo::done(document, _("Set stroke dash"),
+                       INKSCAPE_ICON("dialog-fill-and-stroke"));
+    update = false;
+}
+
+/**
+ * Set the Miter Limit value only.
+ */
+void StrokeStyle::setStrokeMiter()
+{
+    if (update) return;
+    update = true;
+
+    SPCSSAttr *css = sp_repr_css_attr_new();
+    auto value = (*miterLimitAdj)->get_value();
+    sp_repr_css_set_property_double(css, "stroke-miterlimit", value);
+
+    for (auto item : desktop->getSelection()->items()) {
+        sp_desktop_apply_css_recursive(item, css, true);
+    }
+    sp_desktop_set_style (desktop, css, false);
+    sp_repr_css_attr_unref(css);
+    DocumentUndo::done(desktop->getDocument(), _("Set stroke miter"),
+                       INKSCAPE_ICON("dialog-fill-and-stroke"));
+    update = false;
+}
+
+/**
+ * Returns whether the currently selected stroke width is "hairline"
+ *
+ */
+bool
+StrokeStyle::isHairlineSelected() const
+{
+    return unitSelector->get_active_id() == "hairline";
+}
+
+
+/**
+ * This routine handles toggle events for buttons in the stroke style dialog.
+ *
+ * When activated, this routine gets the data for the various widgets, and then
+ * calls the respective routines to update css properties, etc.
+ *
+ */
+void StrokeStyle::buttonToggledCB(StrokeStyleButton *tb, StrokeStyle *spw)
+{
+    if (spw->update) {
+        return;
+    }
+
+    if (tb->get_active()) {
+        if (tb->get_button_type() == STROKE_STYLE_BUTTON_JOIN) {
+            spw->miterLimitSpin->set_sensitive(!strcmp(tb->get_stroke_style(), "miter"));
+        }
+
+        /* TODO: Create some standardized method */
+        SPCSSAttr *css = sp_repr_css_attr_new();
+
+        switch (tb->get_button_type()) {
+            case STROKE_STYLE_BUTTON_JOIN: 
+                sp_repr_css_set_property(css, "stroke-linejoin", tb->get_stroke_style());
+                sp_desktop_set_style (spw->desktop, css);
+                spw->setJoinButtons(tb);
+                break;
+            case STROKE_STYLE_BUTTON_CAP:
+                sp_repr_css_set_property(css, "stroke-linecap", tb->get_stroke_style());
+                sp_desktop_set_style (spw->desktop, css);
+                spw->setCapButtons(tb);
+                break;
+            case STROKE_STYLE_BUTTON_ORDER:
+                sp_repr_css_set_property(css, "paint-order", tb->get_stroke_style());
+                sp_desktop_set_style (spw->desktop, css);
+                //spw->setPaintButtons(tb);
+        }
+
+        sp_repr_css_attr_unref(css);
+        css = nullptr;
+
+        DocumentUndo::done(spw->desktop->getDocument(), _("Set stroke style"), INKSCAPE_ICON("dialog-fill-and-stroke"));
+    }
+}
+
+/**
+ * Updates the join style toggle buttons
+ */
+void
+StrokeStyle::setJoinButtons(Gtk::ToggleButton *active)
+{
+    joinMiter->set_active(active == joinMiter);
+    miterLimitSpin->set_sensitive(active == joinMiter && !isHairlineSelected());
+    joinRound->set_active(active == joinRound);
+    joinBevel->set_active(active == joinBevel);
+}
+
+/**
+ * Updates the cap style toggle buttons
+ */
+void
+StrokeStyle::setCapButtons(Gtk::ToggleButton *active)
+{
+    capButt->set_active(active == capButt);
+    capRound->set_active(active == capRound);
+    capSquare->set_active(active == capSquare);
+}
+
+
+/**
+ * Updates the paint order style toggle buttons
+ */
+void
+StrokeStyle::setPaintOrderButtons(Gtk::ToggleButton *active)
+{
+    paintOrderFSM->set_active(active == paintOrderFSM);
+    paintOrderSFM->set_active(active == paintOrderSFM);
+    paintOrderFMS->set_active(active == paintOrderFMS);
+    paintOrderMFS->set_active(active == paintOrderMFS);
+    paintOrderSMF->set_active(active == paintOrderSMF);
+    paintOrderMSF->set_active(active == paintOrderMSF);
+}
+
+
+/**
+ * Recursively builds a simple list from an arbitrarily complex selection
+ * of items and grouped items
+ */
+static void buildGroupedItemList(SPObject *element, std::vector<SPObject*> &simple_list)
+{
+    if (is<SPGroup>(element)) {
+        for (SPObject *i = element->firstChild(); i; i = i->getNext()) {
+            buildGroupedItemList(i, simple_list);
+        }
+    } else {
+        simple_list.push_back(element);
+    }
+}
+
+
+/**
+ * Updates the marker combobox to highlight the appropriate marker and scroll to
+ * that marker.
+ */
+void
+StrokeStyle::updateAllMarkers(std::vector<SPItem*> const &objects, bool skip_undo)
+{
+    struct { MarkerComboBox *key; int loc; } const keyloc[] = {
+            { startMarkerCombo, SP_MARKER_LOC_START },
+            { midMarkerCombo, SP_MARKER_LOC_MID },
+            { endMarkerCombo, SP_MARKER_LOC_END }
+    };
+
+    bool all_texts = true;
+
+    auto simplified_list = std::vector<SPObject *>();
+    for (SPItem *item : objects) {
+        buildGroupedItemList(item, simplified_list);
+    }
+
+    for (SPObject *object : simplified_list) {
+        if (!is<SPText>(object)) {
+            all_texts = false;
+            break;
+        }
+    }
+
+    // We show markers of the last object in the list only
+    // FIXME: use the first in the list that has the marker of each type, if any
+
+    for (auto const &markertype : keyloc) {
+        // For all three marker types,
+
+        // find the corresponding combobox item
+        MarkerComboBox *combo = markertype.key;
+
+        // Quit if we're in update state
+        if (combo->in_update()) {
+            return;
+        }
+
+        // Per SVG spec, text objects cannot have markers; disable combobox if only texts are selected
+        // They should also be disabled for hairlines, since scaling against a 0-width line doesn't
+        // make sense.
+        combo->set_sensitive(!all_texts && !isHairlineSelected());
+
+        SPObject *marker = nullptr;
+
+        if (!all_texts && !isHairlineSelected()) {
+            for (SPObject *object : simplified_list) {
+                char const *value = object->style->marker_ptrs[markertype.loc]->value();
+
+                // If the object has this type of markers,
+                if (value == nullptr)
+                    continue;
+
+                // Extract the name of the marker that the object uses
+                marker = getMarkerObj(value, object->document);
+            }
+        }
+
+        // Scroll the combobox to that marker
+        combo->set_current(marker);
+    }
+
+}
+
+} // namespace Widget
+} // namespace UI
+} // namespace Inkscape
+
+
+/*
+  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 :