Adding upstream version 1.2.2.upstream/1.2.2upstream

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

1 files changed, 822 insertions, 0 deletions

diff --git a/src/ui/tools/gradient-tool.cpp b/src/ui/tools/gradient-tool.cpp
new file mode 100644
index 0000000..fff39e8
--- /dev/null
+++ b/src/ui/tools/gradient-tool.cpp
@@ -0,0 +1,822 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Gradient drawing and editing tool
+ *
+ * Authors:
+ *   bulia byak <buliabyak@users.sf.net>
+ *   Johan Engelen <j.b.c.engelen@ewi.utwente.nl>
+ *   Abhishek Sharma
+ *
+ * Copyright (C) 2007 Johan Engelen
+ * Copyright (C) 2005 Authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <glibmm/i18n.h>
+#include <gdk/gdkkeysyms.h>
+
+#include "desktop.h"
+#include "document-undo.h"
+#include "document.h"
+#include "gradient-chemistry.h"
+#include "gradient-drag.h"
+#include "message-context.h"
+#include "message-stack.h"
+#include "rubberband.h"
+#include "selection-chemistry.h"
+#include "selection.h"
+#include "snap.h"
+
+#include "include/macros.h"
+
+#include "object/sp-namedview.h"
+#include "object/sp-stop.h"
+
+#include "display/control/canvas-item-curve.h"
+
+#include "svg/css-ostringstream.h"
+
+#include "ui/icon-names.h"
+#include "ui/tools/gradient-tool.h"
+
+using Inkscape::DocumentUndo;
+
+namespace Inkscape {
+namespace UI {
+namespace Tools {
+
+
+GradientTool::GradientTool(SPDesktop *desktop)
+    : ToolBase(desktop, "/tools/gradient", "gradient.svg")
+    , cursor_addnode(false)
+    , node_added(false)
+// TODO: Why are these connections stored as pointers?
+    , selcon(nullptr)
+    , subselcon(nullptr)
+{
+    // TODO: This value is overwritten in the root handler
+    this->tolerance = 6;
+
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+
+    if (prefs->getBool("/tools/gradient/selcue", true)) {
+        this->enableSelectionCue();
+    }
+
+    this->enableGrDrag();
+    Inkscape::Selection *selection = desktop->getSelection();
+
+    this->selcon = new sigc::connection(selection->connectChanged(
+       sigc::mem_fun(this, &GradientTool::selection_changed)
+    ));
+
+    subselcon = new sigc::connection(desktop->connect_gradient_stop_selected(
+        [=](void* sender, SPStop* stop) {
+          selection_changed(nullptr);
+          if (stop) {
+             // sync stop selection:
+            _grdrag->selectByStop(stop, false, true);
+          }
+        }
+    ));
+
+    this->selection_changed(selection);
+}
+
+GradientTool::~GradientTool() {
+    this->enableGrDrag(false);
+
+    this->selcon->disconnect();
+    delete this->selcon;
+
+    this->subselcon->disconnect();
+    delete this->subselcon;
+}
+
+// This must match GrPointType enum sp-gradient.h
+// We should move this to a shared header (can't simply move to gradient.h since that would require
+// including <glibmm/i18n.h> which messes up "N_" in extensions... argh!).
+const gchar *gr_handle_descr [] = {
+    N_("Linear gradient <b>start</b>"), //POINT_LG_BEGIN
+    N_("Linear gradient <b>end</b>"),
+    N_("Linear gradient <b>mid stop</b>"),
+    N_("Radial gradient <b>center</b>"),
+    N_("Radial gradient <b>radius</b>"),
+    N_("Radial gradient <b>radius</b>"),
+    N_("Radial gradient <b>focus</b>"), // POINT_RG_FOCUS
+    N_("Radial gradient <b>mid stop</b>"),
+    N_("Radial gradient <b>mid stop</b>"),
+    N_("Mesh gradient <b>corner</b>"),
+    N_("Mesh gradient <b>handle</b>"),
+    N_("Mesh gradient <b>tensor</b>")
+};
+
+void GradientTool::selection_changed(Inkscape::Selection*) {
+
+    GrDrag *drag = _grdrag;
+    Inkscape::Selection *selection = _desktop->getSelection();
+    if (selection == nullptr) {
+        return;
+    }
+    guint n_obj = (guint) boost::distance(selection->items());
+
+    if (!drag->isNonEmpty() || selection->isEmpty())
+        return;
+    guint n_tot = drag->numDraggers();
+    guint n_sel = drag->numSelected();
+
+    //The use of ngettext in the following code is intentional even if the English singular form would never be used
+    if (n_sel == 1) {
+        if (drag->singleSelectedDraggerNumDraggables() == 1) {
+            gchar * message = g_strconcat(
+                //TRANSLATORS: %s will be substituted with the point name (see previous messages); This is part of a compound message
+                _("%s selected"),
+                //TRANSLATORS: Mind the space in front. This is part of a compound message
+                ngettext(" out of %d gradient handle"," out of %d gradient handles",n_tot),
+                ngettext(" on %d selected object"," on %d selected objects",n_obj),nullptr);
+            message_context->setF(Inkscape::NORMAL_MESSAGE,
+                                  message,_(gr_handle_descr[drag->singleSelectedDraggerSingleDraggableType()]), n_tot, n_obj);
+        } else {
+            gchar * message = g_strconcat(
+                //TRANSLATORS: This is a part of a compound message (out of two more indicating: grandint handle count & object count)
+                ngettext("One handle merging %d stop (drag with <b>Shift</b> to separate) selected",
+                         "One handle merging %d stops (drag with <b>Shift</b> to separate) selected",drag->singleSelectedDraggerNumDraggables()),
+                ngettext(" out of %d gradient handle"," out of %d gradient handles",n_tot),
+                ngettext(" on %d selected object"," on %d selected objects",n_obj),nullptr);
+            message_context->setF(Inkscape::NORMAL_MESSAGE,message,drag->singleSelectedDraggerNumDraggables(), n_tot, n_obj);
+        }
+    } else if (n_sel > 1) {
+        //TRANSLATORS: The plural refers to number of selected gradient handles. This is part of a compound message (part two indicates selected object count)
+        gchar * message = g_strconcat(ngettext("<b>%d</b> gradient handle selected out of %d","<b>%d</b> gradient handles selected out of %d",n_sel),
+                                      //TRANSLATORS: Mind the space in front. (Refers to gradient handles selected). This is part of a compound message
+                                      ngettext(" on %d selected object"," on %d selected objects",n_obj),nullptr);
+        message_context->setF(Inkscape::NORMAL_MESSAGE,message, n_sel, n_tot, n_obj);
+    } else if (n_sel == 0) {
+        message_context->setF(Inkscape::NORMAL_MESSAGE,
+                              //TRANSLATORS: The plural refers to number of selected objects
+                              ngettext("<b>No</b> gradient handles selected out of %d on %d selected object",
+                                       "<b>No</b> gradient handles selected out of %d on %d selected objects",n_obj), n_tot, n_obj);
+    }
+}
+
+void GradientTool::select_next()
+{
+    g_assert(_grdrag);
+    GrDragger *d = _grdrag->select_next();
+    _desktop->scroll_to_point(d->point, 1.0);
+}
+
+void GradientTool::select_prev()
+{
+    g_assert(_grdrag);
+    GrDragger *d = _grdrag->select_prev();
+    _desktop->scroll_to_point(d->point, 1.0);
+}
+
+SPItem *GradientTool::is_over_curve(Geom::Point event_p)
+{
+    //Translate mouse point into proper coord system: needed later.
+    mousepoint_doc = _desktop->w2d(event_p);
+
+    for (auto curve : _grdrag->item_curves) {
+        if (curve->contains(event_p, tolerance)) {
+            return curve->get_item();
+        }
+    }
+    return nullptr;
+}
+
+static std::vector<Geom::Point>
+sp_gradient_context_get_stop_intervals (GrDrag *drag, std::vector<SPStop *> &these_stops, std::vector<SPStop *> &next_stops)
+{
+    std::vector<Geom::Point> coords;
+
+    // for all selected draggers
+    for (std::set<GrDragger *>::const_iterator i = drag->selected.begin(); i != drag->selected.end() ; ++i ) {
+        GrDragger *dragger = *i;
+        // remember the coord of the dragger to reselect it later
+        coords.push_back(dragger->point);
+        // for all draggables of dragger
+        for (std::vector<GrDraggable *>::const_iterator j = dragger->draggables.begin(); j != dragger->draggables.end(); ++j) {
+            GrDraggable *d = *j;
+
+            // find the gradient
+            SPGradient *gradient = getGradient(d->item, d->fill_or_stroke);
+            SPGradient *vector = sp_gradient_get_forked_vector_if_necessary (gradient, false);
+
+            // these draggable types cannot have a next draggabe to insert a stop between them
+            if (d->point_type == POINT_LG_END ||
+                d->point_type == POINT_RG_FOCUS ||
+                d->point_type == POINT_RG_R1 ||
+                d->point_type == POINT_RG_R2) {
+                continue;
+            }
+
+            // from draggables to stops
+            SPStop *this_stop = sp_get_stop_i (vector, d->point_i);
+            SPStop *next_stop = this_stop->getNextStop();
+            SPStop *last_stop = sp_last_stop (vector);
+
+            Inkscape::PaintTarget fs = d->fill_or_stroke;
+            SPItem *item = d->item;
+            gint type = d->point_type;
+            gint p_i = d->point_i;
+
+            // if there's a next stop,
+            if (next_stop) {
+                GrDragger *dnext = nullptr;
+                // find its dragger
+                // (complex because it may have different types, and because in radial,
+                // more than one dragger may correspond to a stop, so we must distinguish)
+                if (type == POINT_LG_BEGIN || type == POINT_LG_MID) {
+                    if (next_stop == last_stop) {
+                        dnext = drag->getDraggerFor(item, POINT_LG_END, p_i+1, fs);
+                    } else {
+                        dnext = drag->getDraggerFor(item, POINT_LG_MID, p_i+1, fs);
+                    }
+                } else { // radial
+                    if (type == POINT_RG_CENTER || type == POINT_RG_MID1) {
+                        if (next_stop == last_stop) {
+                            dnext = drag->getDraggerFor(item, POINT_RG_R1, p_i+1, fs);
+                        } else {
+                            dnext = drag->getDraggerFor(item, POINT_RG_MID1, p_i+1, fs);
+                        }
+                    }
+                    if ((type == POINT_RG_MID2) ||
+                        (type == POINT_RG_CENTER && dnext && !dnext->isSelected())) {
+                        if (next_stop == last_stop) {
+                            dnext = drag->getDraggerFor(item, POINT_RG_R2, p_i+1, fs);
+                        } else {
+                            dnext = drag->getDraggerFor(item, POINT_RG_MID2, p_i+1, fs);
+                        }
+                    }
+                }
+
+                // if both adjacent draggers selected,
+                if ((std::find(these_stops.begin(),these_stops.end(),this_stop)==these_stops.end()) && dnext && dnext->isSelected()) {
+
+                    // remember the coords of the future dragger to select it
+                    coords.push_back(0.5*(dragger->point + dnext->point));
+
+                    // do not insert a stop now, it will confuse the loop;
+                    // just remember the stops
+                    these_stops.push_back(this_stop);
+                    next_stops.push_back(next_stop);
+                }
+            }
+        }
+    }
+    return coords;
+}
+
+void GradientTool::add_stops_between_selected_stops()
+{
+    SPDocument *doc = nullptr;
+    GrDrag *drag = _grdrag;
+
+    std::vector<SPStop *> these_stops;
+    std::vector<SPStop *> next_stops;
+
+    std::vector<Geom::Point> coords = sp_gradient_context_get_stop_intervals (drag, these_stops, next_stops);
+
+    if (these_stops.empty() && drag->numSelected() == 1) {
+        // if a single stop is selected, add between that stop and the next one
+        GrDragger *dragger = *(drag->selected.begin());
+        for (auto d : dragger->draggables) {
+            if (d->point_type == POINT_RG_FOCUS) {
+                /*
+                 *  There are 2 draggables at the center (start) of a radial gradient
+                 *  To avoid creating 2 separate stops, ignore this draggable point type
+                 */
+                continue;
+            }
+            SPGradient *gradient = getGradient(d->item, d->fill_or_stroke);
+            SPGradient *vector = sp_gradient_get_forked_vector_if_necessary (gradient, false);
+            SPStop *this_stop = sp_get_stop_i (vector, d->point_i);
+            if (this_stop) {
+                SPStop *next_stop = this_stop->getNextStop();
+                if (next_stop) {
+                    these_stops.push_back(this_stop);
+                    next_stops.push_back(next_stop);
+                }
+            }
+        }
+    }
+
+    // now actually create the new stops
+    auto i = these_stops.rbegin();
+    auto j = next_stops.rbegin();
+    std::vector<SPStop *> new_stops;
+
+    for (;i != these_stops.rend() && j != next_stops.rend(); ++i, ++j ) {
+        SPStop *this_stop = *i;
+        SPStop *next_stop = *j;
+        gfloat offset = 0.5*(this_stop->offset + next_stop->offset);
+        SPObject *parent = this_stop->parent;
+        if (SP_IS_GRADIENT (parent)) {
+            doc = parent->document;
+            SPStop *new_stop = sp_vector_add_stop (SP_GRADIENT (parent), this_stop, next_stop, offset);
+            new_stops.push_back(new_stop);
+            SP_GRADIENT(parent)->ensureVector();
+        }
+    }
+
+    if (!these_stops.empty() && doc) {
+        DocumentUndo::done(doc, _("Add gradient stop"), INKSCAPE_ICON("color-gradient"));
+        drag->updateDraggers();
+        // so that it does not automatically update draggers in idle loop, as this would deselect
+        drag->local_change = true;
+
+        // select the newly created stops
+        for (auto i:new_stops) {
+            drag->selectByStop(i);
+        }
+    }
+}
+
+static double sqr(double x) {return x*x;}
+
+/**
+ * Remove unnecessary stops in the adjacent currently selected stops
+ *
+ * For selected stops that are adjacent to each other, remove
+ * stops that don't change the gradient visually, within a range of tolerance.
+ *
+ * @param tolerance maximum difference between stop and expected color at that position
+ */
+void GradientTool::simplify(double tolerance)
+{
+    SPDocument *doc = nullptr;
+    GrDrag *drag = _grdrag;
+
+    std::vector<SPStop *> these_stops;
+    std::vector<SPStop *> next_stops;
+
+    std::vector<Geom::Point> coords = sp_gradient_context_get_stop_intervals (drag, these_stops, next_stops);
+
+    std::set<SPStop *> todel;
+
+    auto i = these_stops.begin();
+    auto j = next_stops.begin();
+    for (; i != these_stops.end() && j != next_stops.end(); ++i, ++j) {
+        SPStop *stop0 = *i;
+        SPStop *stop1 = *j;
+
+        // find the next adjacent stop if it exists and is in selection
+        auto i1 = std::find(these_stops.begin(), these_stops.end(), stop1);
+        if (i1 != these_stops.end()) {
+            if (next_stops.size()>(i1-these_stops.begin())) {
+                SPStop *stop2 = *(next_stops.begin() + (i1-these_stops.begin()));
+
+                if (todel.find(stop0)!=todel.end() || todel.find(stop2) != todel.end())
+                    continue;
+
+                // compare color of stop1 to the average color of stop0 and stop2
+                guint32 const c0 = stop0->get_rgba32();
+                guint32 const c2 = stop2->get_rgba32();
+                guint32 const c1r = stop1->get_rgba32();
+                guint32 c1 = average_color (c0, c2,
+                       (stop1->offset - stop0->offset) / (stop2->offset - stop0->offset));
+
+                double diff =
+                    sqr(SP_RGBA32_R_F(c1) - SP_RGBA32_R_F(c1r)) +
+                    sqr(SP_RGBA32_G_F(c1) - SP_RGBA32_G_F(c1r)) +
+                    sqr(SP_RGBA32_B_F(c1) - SP_RGBA32_B_F(c1r)) +
+                    sqr(SP_RGBA32_A_F(c1) - SP_RGBA32_A_F(c1r));
+
+                if (diff < tolerance)
+                    todel.insert(stop1);
+            }
+        }
+    }
+
+    for (auto stop : todel) {
+        doc = stop->document;
+        Inkscape::XML::Node * parent = stop->getRepr()->parent();
+        parent->removeChild( stop->getRepr() );
+    }
+
+    if (!todel.empty()) {
+        DocumentUndo::done(doc, _("Simplify gradient"), INKSCAPE_ICON("color-gradient"));
+        drag->local_change = true;
+        drag->updateDraggers();
+        drag->selectByCoords(coords);
+    }
+}
+
+void GradientTool::add_stop_near_point(SPItem *item, Geom::Point mouse_p, guint32 /*etime*/)
+{
+    // item is the selected item. mouse_p the location in doc coordinates of where to add the stop
+    SPStop *newstop = get_drag()->addStopNearPoint(item, mouse_p, tolerance / _desktop->current_zoom());
+
+    DocumentUndo::done(_desktop->getDocument(), _("Add gradient stop"), INKSCAPE_ICON("color-gradient"));
+
+    get_drag()->updateDraggers();
+    get_drag()->local_change = true;
+    get_drag()->selectByStop(newstop);
+}
+
+bool GradientTool::root_handler(GdkEvent* event) {
+    static bool dragging;
+
+    Inkscape::Selection *selection = _desktop->getSelection();
+
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+    tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
+
+    GrDrag *drag = this->_grdrag;
+    g_assert (drag);
+
+    gint ret = FALSE;
+
+    switch (event->type) {
+    case GDK_2BUTTON_PRESS:
+        if ( event->button.button == 1 ) {
+            SPItem *item = is_over_curve(Geom::Point(event->motion.x, event->motion.y));
+            if (item) {
+                // we take the first item in selection, because with doubleclick, the first click
+                // always resets selection to the single object under cursor
+                add_stop_near_point(selection->items().front(), mousepoint_doc, event->button.time);
+            } else {
+               auto items= selection->items();
+                for (auto i = items.begin();i!=items.end();++i) {
+                    SPItem *item = *i;
+                    SPGradientType new_type = (SPGradientType) prefs->getInt("/tools/gradient/newgradient", SP_GRADIENT_TYPE_LINEAR);
+                    Inkscape::PaintTarget fsmode = (prefs->getInt("/tools/gradient/newfillorstroke", 1) != 0) ? Inkscape::FOR_FILL : Inkscape::FOR_STROKE;
+
+                    SPGradient *vector = sp_gradient_vector_for_object(_desktop->getDocument(), _desktop, item, fsmode);
+
+                    SPGradient *priv = sp_item_set_gradient(item, vector, new_type, fsmode);
+                    sp_gradient_reset_to_userspace(priv, item);
+                }
+                _desktop->redrawDesktop();;
+                DocumentUndo::done(_desktop->getDocument(), _("Create default gradient"), INKSCAPE_ICON("color-gradient"));
+            }
+            ret = TRUE;
+        }
+        break;
+
+    case GDK_BUTTON_PRESS:
+        if ( event->button.button == 1 ) {
+            Geom::Point button_w(event->button.x, event->button.y);
+
+            // save drag origin
+            this->xp = (gint) button_w[Geom::X];
+            this->yp = (gint) button_w[Geom::Y];
+            this->within_tolerance = true;
+
+            dragging = true;
+
+            Geom::Point button_dt = _desktop->w2d(button_w);
+            if (event->button.state & GDK_SHIFT_MASK) {
+                Inkscape::Rubberband::get(_desktop)->start(_desktop, button_dt);
+            } else {
+                // remember clicked item, disregarding groups, honoring Alt; do nothing with Crtl to
+                // enable Ctrl+doubleclick of exactly the selected item(s)
+                if (!(event->button.state & GDK_CONTROL_MASK)) {
+                    this->item_to_select = sp_event_context_find_item (_desktop, button_w, event->button.state & GDK_MOD1_MASK, TRUE);
+                }
+
+                if (!selection->isEmpty()) {
+                    SnapManager &m = _desktop->namedview->snap_manager;
+                    m.setup(_desktop);
+                    m.freeSnapReturnByRef(button_dt, Inkscape::SNAPSOURCE_NODE_HANDLE);
+                    m.unSetup();
+                }
+
+                this->origin = button_dt;
+            }
+
+            ret = TRUE;
+        }
+        break;
+
+    case GDK_MOTION_NOTIFY:
+        if (dragging && ( event->motion.state & GDK_BUTTON1_MASK )) {
+            if ( this->within_tolerance
+                 && ( abs( (gint) event->motion.x - this->xp ) < this->tolerance )
+                 && ( abs( (gint) event->motion.y - this->yp ) < this->tolerance ) ) {
+                break; // do not drag if we're within tolerance from origin
+            }
+            // Once the user has moved farther than tolerance from the original location
+            // (indicating they intend to draw, not click), then always process the
+            // motion notify coordinates as given (no snapping back to origin)
+            this->within_tolerance = false;
+
+            Geom::Point const motion_w(event->motion.x,
+                                     event->motion.y);
+            Geom::Point const motion_dt = _desktop->w2d(motion_w);
+
+            if (Inkscape::Rubberband::get(_desktop)->is_started()) {
+                Inkscape::Rubberband::get(_desktop)->move(motion_dt);
+                this->defaultMessageContext()->set(Inkscape::NORMAL_MESSAGE, _("<b>Draw around</b> handles to select them"));
+            } else {
+                this->drag(motion_dt, event->motion.state, event->motion.time);
+            }
+
+            gobble_motion_events(GDK_BUTTON1_MASK);
+
+            ret = TRUE;
+        } else {
+            if (!drag->mouseOver() && !selection->isEmpty()) {
+                SnapManager &m = _desktop->namedview->snap_manager;
+                m.setup(_desktop);
+
+                Geom::Point const motion_w(event->motion.x, event->motion.y);
+                Geom::Point const motion_dt = _desktop->w2d(motion_w);
+
+                m.preSnap(Inkscape::SnapCandidatePoint(motion_dt, Inkscape::SNAPSOURCE_OTHER_HANDLE));
+                m.unSetup();
+            }
+
+            SPItem *item = is_over_curve(Geom::Point(event->motion.x, event->motion.y));
+
+            if (this->cursor_addnode && !item) {
+                this->set_cursor("gradient.svg");
+                this->cursor_addnode = false;
+            } else if (!this->cursor_addnode && item) {
+                this->set_cursor("gradient-add.svg");
+                this->cursor_addnode = true;
+            }
+        }
+        break;
+
+    case GDK_BUTTON_RELEASE:
+        this->xp = this->yp = 0;
+
+        if ( event->button.button == 1 ) {
+            SPItem *item = is_over_curve(Geom::Point(event->motion.x, event->motion.y));
+
+            if ( (event->button.state & GDK_CONTROL_MASK) && (event->button.state & GDK_MOD1_MASK ) ) {
+                if (item) {
+                    this->add_stop_near_point(item, this->mousepoint_doc, 0);
+                    ret = TRUE;
+                }
+            } else {
+                dragging = false;
+
+                // unless clicked with Ctrl (to enable Ctrl+doubleclick).
+                if (event->button.state & GDK_CONTROL_MASK) {
+                    ret = TRUE;
+                    break;
+                }
+
+                if (!this->within_tolerance) {
+                    // we've been dragging, either do nothing (grdrag handles that),
+                    // or rubberband-select if we have rubberband
+                    Inkscape::Rubberband *r = Inkscape::Rubberband::get(_desktop);
+
+                    if (r->is_started() && !this->within_tolerance) {
+                        // this was a rubberband drag
+                        if (r->getMode() == RUBBERBAND_MODE_RECT) {
+                            Geom::OptRect const b = r->getRectangle();
+                            drag->selectRect(*b);
+                        }
+                    }
+                } else if (this->item_to_select) {
+                    if (item) {
+                        // Clicked on an existing gradient line, don't change selection. This stops
+                        // possible change in selection during a double click with overlapping objects
+                    } else {
+                        // no dragging, select clicked item if any
+                        if (event->button.state & GDK_SHIFT_MASK) {
+                            selection->toggle(this->item_to_select);
+                        } else {
+                            drag->deselectAll();
+                            selection->set(this->item_to_select);
+                        }
+                    }
+                } else {
+                    // click in an empty space; do the same as Esc
+                    if (!drag->selected.empty()) {
+                        drag->deselectAll();
+                    } else {
+                        selection->clear();
+                    }
+                }
+
+                this->item_to_select = nullptr;
+                ret = TRUE;
+            }
+
+            Inkscape::Rubberband::get(_desktop)->stop();
+        }
+        break;
+
+    case GDK_KEY_PRESS:
+        switch (get_latin_keyval (&event->key)) {
+        case GDK_KEY_Alt_L:
+        case GDK_KEY_Alt_R:
+        case GDK_KEY_Control_L:
+        case GDK_KEY_Control_R:
+        case GDK_KEY_Shift_L:
+        case GDK_KEY_Shift_R:
+        case GDK_KEY_Meta_L:  // Meta is when you press Shift+Alt (at least on my machine)
+        case GDK_KEY_Meta_R:
+            sp_event_show_modifier_tip (this->defaultMessageContext(), event,
+                                        _("<b>Ctrl</b>: snap gradient angle"),
+                                        _("<b>Shift</b>: draw gradient around the starting point"),
+                                        nullptr);
+            break;
+
+        case GDK_KEY_x:
+        case GDK_KEY_X:
+            if (MOD__ALT_ONLY(event)) {
+                _desktop->setToolboxFocusTo("altx-grad");
+                ret = TRUE;
+            }
+            break;
+
+        case GDK_KEY_A:
+        case GDK_KEY_a:
+            if (MOD__CTRL_ONLY(event) && drag->isNonEmpty()) {
+                drag->selectAll();
+                ret = TRUE;
+            }
+            break;
+
+        case GDK_KEY_L:
+        case GDK_KEY_l:
+            if (MOD__CTRL_ONLY(event) && drag->isNonEmpty() && drag->hasSelection()) {
+                this->simplify(1e-4);
+                ret = TRUE;
+            }
+            break;
+
+        case GDK_KEY_Escape:
+            if (!drag->selected.empty()) {
+                drag->deselectAll();
+            } else {
+                Inkscape::SelectionHelper::selectNone(_desktop);
+            }
+            ret = TRUE;
+            //TODO: make dragging escapable by Esc
+            break;
+
+        case GDK_KEY_r:
+        case GDK_KEY_R:
+            if (MOD__SHIFT_ONLY(event)) {
+                sp_gradient_reverse_selected_gradients(_desktop);
+                ret = TRUE;
+            }
+            break;
+
+        case GDK_KEY_Insert:
+        case GDK_KEY_KP_Insert:
+            // with any modifiers:
+            this->add_stops_between_selected_stops();
+            ret = TRUE;
+            break;
+
+        case GDK_KEY_i:
+        case GDK_KEY_I:
+            if (MOD__SHIFT_ONLY(event)) {
+                // Shift+I - insert stops (alternate keybinding for keyboards
+                //           that don't have the Insert key)
+                this->add_stops_between_selected_stops();
+                ret = TRUE;
+            }
+            break;
+
+        case GDK_KEY_Delete:
+        case GDK_KEY_KP_Delete:
+        case GDK_KEY_BackSpace:
+            ret = this->deleteSelectedDrag(MOD__CTRL_ONLY(event));
+            break;
+
+        case GDK_KEY_Tab:
+            if (hasGradientDrag()) {
+                select_next();
+                ret = TRUE;
+            }
+            break;
+
+        case GDK_KEY_ISO_Left_Tab:
+            if (hasGradientDrag()) {
+                select_prev();
+                ret = TRUE;
+            }
+            break;
+
+        default:
+            ret = drag->key_press_handler(event);
+            break;
+        }
+        break;
+
+    case GDK_KEY_RELEASE:
+        switch (get_latin_keyval (&event->key)) {
+        case GDK_KEY_Alt_L:
+        case GDK_KEY_Alt_R:
+        case GDK_KEY_Control_L:
+        case GDK_KEY_Control_R:
+        case GDK_KEY_Shift_L:
+        case GDK_KEY_Shift_R:
+        case GDK_KEY_Meta_L:  // Meta is when you press Shift+Alt
+        case GDK_KEY_Meta_R:
+            this->defaultMessageContext()->clear();
+            break;
+
+        default:
+            break;
+        }
+        break;
+
+    default:
+        break;
+    }
+
+    if (!ret) {
+       ret = ToolBase::root_handler(event);
+    }
+
+    return ret;
+}
+
+// Creates a new linear or radial gradient.
+void GradientTool::drag(Geom::Point const pt, guint /*state*/, guint32 etime)
+{
+    Inkscape::Selection *selection = _desktop->getSelection();
+    SPDocument *document = _desktop->getDocument();
+
+    if (!selection->isEmpty()) {
+        Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+        int type = prefs->getInt("/tools/gradient/newgradient", 1);
+        Inkscape::PaintTarget fill_or_stroke = (prefs->getInt("/tools/gradient/newfillorstroke", 1) != 0) ? Inkscape::FOR_FILL : Inkscape::FOR_STROKE;
+
+        SPGradient *vector;
+        if (item_to_select) {
+            // pick color from the object where drag started
+            vector = sp_gradient_vector_for_object(document, _desktop, item_to_select, fill_or_stroke);
+        } else {
+            // Starting from empty space:
+            // Sort items so that the topmost comes last
+           std::vector<SPItem*> items(selection->items().begin(), selection->items().end());
+            sort(items.begin(),items.end(),sp_item_repr_compare_position_bool);
+            // take topmost
+            vector = sp_gradient_vector_for_object(document, _desktop, items.back(), fill_or_stroke);
+        }
+
+        // HACK: reset fill-opacity - that 0.75 is annoying; BUT remove this when we have an opacity slider for all tabs
+        SPCSSAttr *css = sp_repr_css_attr_new();
+        sp_repr_css_set_property(css, "fill-opacity", "1.0");
+
+        auto itemlist = selection->items();
+        for (auto i = itemlist.begin();i!=itemlist.end();++i) {
+
+            //FIXME: see above
+            sp_repr_css_change_recursive((*i)->getRepr(), css, "style");
+
+            sp_item_set_gradient(*i, vector, (SPGradientType) type, fill_or_stroke);
+
+            if (type == SP_GRADIENT_TYPE_LINEAR) {
+                sp_item_gradient_set_coords(*i, POINT_LG_BEGIN, 0, origin, fill_or_stroke, true, false);
+                sp_item_gradient_set_coords (*i, POINT_LG_END, 0, pt, fill_or_stroke, true, false);
+            } else if (type == SP_GRADIENT_TYPE_RADIAL) {
+                sp_item_gradient_set_coords(*i, POINT_RG_CENTER, 0, origin, fill_or_stroke, true, false);
+                sp_item_gradient_set_coords (*i, POINT_RG_R1, 0, pt, fill_or_stroke, true, false);
+            }
+            (*i)->requestModified(SP_OBJECT_MODIFIED_FLAG);
+        }
+        if (_grdrag) {
+            _grdrag->updateDraggers();
+            // prevent regenerating draggers by selection modified signal, which sometimes
+            // comes too late and thus destroys the knot which we will now grab:
+            _grdrag->local_change = true;
+            // give the grab out-of-bounds values of xp/yp because we're already dragging
+            // and therefore are already out of tolerance
+            _grdrag->grabKnot (selection->items().front(),
+                                   type == SP_GRADIENT_TYPE_LINEAR? POINT_LG_END : POINT_RG_R1,
+                                   -1, // ignore number (though it is always 1)
+                                   fill_or_stroke, 99999, 99999, etime);
+        }
+        // We did an undoable action, but SPDocumentUndo::done will be called by the knot when released
+
+        // status text; we do not track coords because this branch is run once, not all the time
+        // during drag
+        int n_objects = (int) boost::distance(selection->items());
+        message_context->setF(Inkscape::NORMAL_MESSAGE,
+                                  ngettext("<b>Gradient</b> for %d object; with <b>Ctrl</b> to snap angle",
+                                           "<b>Gradient</b> for %d objects; with <b>Ctrl</b> to snap angle", n_objects),
+                                  n_objects);
+    } else {
+        _desktop->getMessageStack()->flash(Inkscape::WARNING_MESSAGE, _("Select <b>objects</b> on which to create gradient."));
+    }
+}
+
+}
+}
+}
+
+
+/*
+  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 :