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diff --git a/src/ui/tools/tool-base.cpp b/src/ui/tools/tool-base.cpp
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Main event handling, and related helper functions.
+ *
+ * Authors:
+ * Lauris Kaplinski <lauris@kaplinski.com>
+ * Frank Felfe <innerspace@iname.com>
+ * bulia byak <buliabyak@users.sf.net>
+ * Jon A. Cruz <jon@joncruz.org>
+ * Kris De Gussem <Kris.DeGussem@gmail.com>
+ *
+ * Copyright (C) 1999-2012 authors
+ * Copyright (C) 2001-2002 Ximian, Inc.
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <gdk/gdkkeysyms.h>
+#include <gdkmm/display.h>
+#include <glibmm/i18n.h>
+
+#include "shortcuts.h"
+#include "file.h"
+
+
+
+#include "desktop-events.h"
+#include "desktop-style.h"
+#include "desktop.h"
+#include "gradient-drag.h"
+#include "knot-ptr.h"
+#include "include/macros.h"
+#include "message-context.h"
+#include "rubberband.h"
+#include "selcue.h"
+#include "selection.h"
+#include "sp-cursor.h"
+
+#include "display/sp-canvas.h"
+#include "display/sp-canvas-group.h"
+#include "display/canvas-rotate.h"
+
+#include "include/gtkmm_version.h"
+
+#include "object/sp-guide.h"
+
+#include "ui/contextmenu.h"
+#include "ui/interface.h"
+#include "ui/event-debug.h"
+#include "ui/tool/control-point.h"
+#include "ui/shape-editor.h"
+#include "ui/tools/tool-base.h"
+#include "ui/tools-switch.h"
+#include "ui/tools/lpe-tool.h"
+#include "ui/tool/commit-events.h"
+#include "ui/tool/event-utils.h"
+#include "ui/tools/node-tool.h"
+#include "ui/tool/shape-record.h"
+
+#include "widgets/desktop-widget.h"
+
+#include "xml/node-event-vector.h"
+
+// globals for temporary switching to selector by space
+static bool selector_toggled = FALSE;
+static int switch_selector_to = 0;
+
+// globals for temporary switching to dropper by 'D'
+static bool dropper_toggled = FALSE;
+static int switch_dropper_to = 0;
+
+// globals for keeping track of keyboard scroll events in order to accelerate
+static guint32 scroll_event_time = 0;
+static gdouble scroll_multiply = 1;
+static guint scroll_keyval = 0;
+
+// globals for key processing
+static bool latin_keys_group_valid = FALSE;
+static gint latin_keys_group;
+
+
+namespace Inkscape {
+namespace UI {
+namespace Tools {
+
+static void set_event_location(SPDesktop * desktop, GdkEvent * event);
+
+
+void ToolBase::set(const Inkscape::Preferences::Entry& /*val*/) {
+}
+
+void ToolBase::finish() {
+ this->desktop->canvas->endForcedFullRedraws();
+ this->enableSelectionCue(false);
+}
+
+SPDesktop const& ToolBase::getDesktop() const {
+ return *desktop;
+}
+
+ToolBase::ToolBase(gchar const *const *cursor_shape, bool uses_snap)
+ : pref_observer(nullptr)
+ , cursor(nullptr)
+ , xp(0)
+ , yp(0)
+ , tolerance(0)
+ , within_tolerance(false)
+ , item_to_select(nullptr)
+ , message_context(nullptr)
+ , _selcue(nullptr)
+ , _grdrag(nullptr)
+ , shape_editor(nullptr)
+ , space_panning(false)
+ , _delayed_snap_event(nullptr)
+ , _dse_callback_in_process(false)
+ , desktop(nullptr)
+ , _uses_snap(uses_snap)
+ , cursor_shape(cursor_shape)
+ , _button1on(false)
+ , _button3on(false)
+{
+}
+
+ToolBase::~ToolBase() {
+ this->message_context = nullptr;
+
+ if (this->desktop) {
+ this->desktop = nullptr;
+ }
+
+ if (this->pref_observer) {
+ delete this->pref_observer;
+ }
+
+ if (this->_delayed_snap_event) {
+ delete this->_delayed_snap_event;
+ }
+}
+
+
+/**
+ * Set the cursor to a standard GDK cursor
+ */
+void ToolBase::sp_event_context_set_cursor(GdkCursorType cursor_type) {
+
+ GtkWidget *w = GTK_WIDGET(this->desktop->getCanvas());
+ GdkDisplay *display = gdk_display_get_default();
+ GdkCursor *cursor = gdk_cursor_new_for_display(display, cursor_type);
+
+ if (cursor) {
+ gdk_window_set_cursor (gtk_widget_get_window (w), cursor);
+ g_object_unref (cursor);
+ }
+}
+
+/**
+ * Recreates and draws cursor on desktop related to ToolBase.
+ */
+void ToolBase::sp_event_context_update_cursor() {
+ Gtk::Widget* w = Glib::wrap(GTK_WIDGET(desktop->getCanvas()));
+ if (w->get_window()) {
+ if (this->cursor_shape) {
+ bool fillHasColor=false, strokeHasColor=false;
+ guint32 fillColor = sp_desktop_get_color_tool(this->desktop, this->getPrefsPath(), true, &fillHasColor);
+ guint32 strokeColor = sp_desktop_get_color_tool(this->desktop, this->getPrefsPath(), false, &strokeHasColor);
+ double fillOpacity = fillHasColor ? sp_desktop_get_opacity_tool(this->desktop, this->getPrefsPath(), true) : 1.0;
+ double strokeOpacity = strokeHasColor ? sp_desktop_get_opacity_tool(this->desktop, this->getPrefsPath(), false) : 1.0;
+
+ this->cursor = Glib::wrap(sp_cursor_from_xpm(
+ this->cursor_shape,
+ SP_RGBA32_C_COMPOSE(fillColor, fillOpacity),
+ SP_RGBA32_C_COMPOSE(strokeColor, strokeOpacity)
+ ));
+ }
+ w->get_window()->set_cursor(cursor);
+ w->get_display()->flush();
+ }
+ this->desktop->waiting_cursor = false;
+}
+
+/**
+ * Callback that gets called on initialization of ToolBase object.
+ * Redraws mouse cursor, at the moment.
+ *
+ * When you override it, call this method first.
+ */
+void ToolBase::setup() {
+ this->pref_observer = new ToolPrefObserver(this->getPrefsPath(), this);
+ Inkscape::Preferences::get()->addObserver(*(this->pref_observer));
+ this->sp_event_context_update_cursor();
+}
+
+/**
+ * Gobbles next key events on the queue with the same keyval and mask. Returns the number of events consumed.
+ */
+gint gobble_key_events(guint keyval, gint mask) {
+ GdkEvent *event_next;
+ gint i = 0;
+
+ event_next = gdk_event_get();
+ // while the next event is also a key notify with the same keyval and mask,
+ while (event_next && (event_next->type == GDK_KEY_PRESS || event_next->type
+ == GDK_KEY_RELEASE) && event_next->key.keyval == keyval && (!mask
+ || (event_next->key.state & mask))) {
+ if (event_next->type == GDK_KEY_PRESS)
+ i++;
+ // kill it
+ gdk_event_free(event_next);
+ // get next
+ event_next = gdk_event_get();
+ }
+ // otherwise, put it back onto the queue
+ if (event_next)
+ gdk_event_put(event_next);
+
+ return i;
+}
+
+/**
+ * Gobbles next motion notify events on the queue with the same mask. Returns the number of events consumed.
+ */
+gint gobble_motion_events(gint mask) {
+ GdkEvent *event_next;
+ gint i = 0;
+
+ event_next = gdk_event_get();
+ // while the next event is also a key notify with the same keyval and mask,
+ while (event_next && event_next->type == GDK_MOTION_NOTIFY
+ && (event_next->motion.state & mask)) {
+ // kill it
+ gdk_event_free(event_next);
+ // get next
+ event_next = gdk_event_get();
+ i++;
+ }
+ // otherwise, put it back onto the queue
+ if (event_next)
+ gdk_event_put(event_next);
+
+ return i;
+}
+
+/**
+ * Toggles current tool between active tool and selector tool.
+ * Subroutine of sp_event_context_private_root_handler().
+ */
+static void sp_toggle_selector(SPDesktop *dt) {
+ if (!dt->event_context)
+ return;
+
+ if (tools_isactive(dt, TOOLS_SELECT)) {
+ if (selector_toggled) {
+ if (switch_selector_to)
+ tools_switch(dt, switch_selector_to);
+ selector_toggled = FALSE;
+ } else
+ return;
+ } else {
+ selector_toggled = TRUE;
+ switch_selector_to = tools_active(dt);
+ tools_switch(dt, TOOLS_SELECT);
+ }
+}
+
+/**
+ * Toggles current tool between active tool and dropper tool.
+ * Subroutine of sp_event_context_private_root_handler().
+ */
+void sp_toggle_dropper(SPDesktop *dt) {
+ if (!dt->event_context)
+ return;
+
+ if (tools_isactive(dt, TOOLS_DROPPER)) {
+ if (dropper_toggled) {
+ if (switch_dropper_to)
+ tools_switch(dt, switch_dropper_to);
+ dropper_toggled = FALSE;
+ } else
+ return;
+ } else {
+ dropper_toggled = TRUE;
+ switch_dropper_to = tools_active(dt);
+ tools_switch(dt, TOOLS_DROPPER);
+ }
+}
+
+/**
+ * Calculates and keeps track of scroll acceleration.
+ * Subroutine of sp_event_context_private_root_handler().
+ */
+static gdouble accelerate_scroll(GdkEvent *event, gdouble acceleration,
+ SPCanvas */*canvas*/) {
+ guint32 time_diff = ((GdkEventKey *) event)->time - scroll_event_time;
+
+ /* key pressed within 500ms ? (1/2 second) */
+ if (time_diff > 500 || event->key.keyval != scroll_keyval) {
+ scroll_multiply = 1; // abort acceleration
+ } else {
+ scroll_multiply += acceleration; // continue acceleration
+ }
+
+ scroll_event_time = ((GdkEventKey *) event)->time;
+ scroll_keyval = event->key.keyval;
+
+ return scroll_multiply;
+}
+
+/** Moves the selected points along the supplied unit vector according to
+ * the modifier state of the supplied event. */
+bool ToolBase::_keyboardMove(GdkEventKey const &event, Geom::Point const &dir)
+{
+ if (held_control(event)) return false;
+ unsigned num = 1 + combine_key_events(shortcut_key(event), 0);
+ Geom::Point delta = dir * num;
+ if (held_shift(event)) delta *= 10;
+ if (held_alt(event)) {
+ delta /= desktop->current_zoom();
+ } else {
+ Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+ double nudge = prefs->getDoubleLimited("/options/nudgedistance/value", 2, 0, 1000, "px");
+ delta *= nudge;
+ }
+ if (shape_editor && shape_editor->has_knotholder()) {
+ KnotHolder * knotholder = shape_editor->knotholder;
+ if (knotholder) {
+ knotholder->transform_selected(Geom::Translate(delta));
+ }
+ } else if (tools_isactive(desktop, TOOLS_NODES)) {
+ Inkscape::UI::Tools::NodeTool *nt = static_cast<Inkscape::UI::Tools::NodeTool*>(desktop->event_context);
+ if (nt) {
+ for(auto i=nt->_shape_editors.begin();i!=nt->_shape_editors.end();++i){
+ ShapeEditor * shape_editor = i->second;
+ if (shape_editor && shape_editor->has_knotholder()) {
+ KnotHolder * knotholder = shape_editor->knotholder;
+ if (knotholder) {
+ knotholder->transform_selected(Geom::Translate(delta));
+ }
+ }
+ }
+ }
+ }
+ return true;
+}
+
+
+bool ToolBase::root_handler(GdkEvent* event) {
+
+ // ui_dump_event (event, "ToolBase::root_handler");
+ static Geom::Point button_w;
+ static unsigned int panning = 0;
+ static unsigned int panning_cursor = 0;
+ static unsigned int zoom_rb = 0;
+
+ Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+
+ /// @todo REmove redundant /value in preference keys
+ tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
+ bool allow_panning = prefs->getBool("/options/spacebarpans/value");
+ gint ret = FALSE;
+
+ switch (event->type) {
+ case GDK_2BUTTON_PRESS:
+ if (panning) {
+ panning = 0;
+ sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate));
+ ret = TRUE;
+ } else {
+ /* sp_desktop_dialog(); */
+ }
+ break;
+
+ case GDK_BUTTON_PRESS:
+ // save drag origin
+ xp = (gint) event->button.x;
+ yp = (gint) event->button.y;
+ within_tolerance = true;
+
+ button_w = Geom::Point(event->button.x, event->button.y);
+
+ switch (event->button.button) {
+ case 1:
+ if (this->space_panning) {
+ // When starting panning, make sure there are no snap events pending because these might disable the panning again
+ if (_uses_snap) {
+ sp_event_context_discard_delayed_snap_event(this);
+ }
+ panning = 1;
+
+ sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
+ GDK_KEY_RELEASE_MASK | GDK_BUTTON_RELEASE_MASK
+ | GDK_POINTER_MOTION_MASK
+ | GDK_POINTER_MOTION_HINT_MASK, nullptr,
+ event->button.time - 1);
+
+ ret = TRUE;
+ }
+ break;
+
+ case 2:
+ if ((event->button.state & GDK_CONTROL_MASK) && !desktop->get_rotation_lock()) {
+ // On screen canvas rotation preview
+
+ // Grab background before doing anything else
+ sp_canvas_rotate_start (SP_CANVAS_ROTATE(desktop->canvas_rotate),
+ desktop->canvas->_backing_store);
+ sp_canvas_item_ungrab (desktop->acetate);
+ sp_canvas_item_show (desktop->canvas_rotate);
+ sp_canvas_item_grab (desktop->canvas_rotate,
+ GDK_KEY_PRESS_MASK | GDK_KEY_RELEASE_MASK |
+ GDK_BUTTON_RELEASE_MASK |
+ GDK_POINTER_MOTION_MASK,
+ nullptr, event->button.time );
+ // sp_canvas_item_hide (desktop->drawing);
+
+ } else if (event->button.state & GDK_SHIFT_MASK) {
+ zoom_rb = 2;
+ } else {
+ // When starting panning, make sure there are no snap events pending because these might disable the panning again
+ if (_uses_snap) {
+ sp_event_context_discard_delayed_snap_event(this);
+ }
+ panning = 2;
+
+ sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
+ GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK |
+ GDK_POINTER_MOTION_HINT_MASK,
+ nullptr, event->button.time - 1);
+
+ }
+
+ ret = TRUE;
+ break;
+
+ case 3:
+ if ((event->button.state & GDK_SHIFT_MASK) || (event->button.state & GDK_CONTROL_MASK)) {
+ // When starting panning, make sure there are no snap events pending because these might disable the panning again
+ if (_uses_snap) {
+ sp_event_context_discard_delayed_snap_event(this);
+ }
+ panning = 3;
+
+ sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
+ GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK
+ | GDK_POINTER_MOTION_HINT_MASK, nullptr,
+ event->button.time);
+
+ ret = TRUE;
+ } else {
+ sp_event_root_menu_popup(desktop, nullptr, event);
+ }
+ break;
+
+ default:
+ break;
+ }
+ break;
+
+ case GDK_MOTION_NOTIFY:
+ if (panning) {
+ if (panning == 4 && !xp && !yp ) {
+ // <Space> + mouse panning started, save location and grab canvas
+ xp = event->motion.x;
+ yp = event->motion.y;
+ button_w = Geom::Point(event->motion.x, event->motion.y);
+
+ sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
+ GDK_KEY_RELEASE_MASK | GDK_BUTTON_RELEASE_MASK
+ | GDK_POINTER_MOTION_MASK
+ | GDK_POINTER_MOTION_HINT_MASK, nullptr,
+ event->motion.time - 1);
+ }
+
+ if ((panning == 2 && !(event->motion.state & GDK_BUTTON2_MASK))
+ || (panning == 1 && !(event->motion.state & GDK_BUTTON1_MASK))
+ || (panning == 3 && !(event->motion.state & GDK_BUTTON3_MASK))) {
+ /* Gdk seems to lose button release for us sometimes :-( */
+ panning = 0;
+ sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate));
+ ret = TRUE;
+ } else {
+ // To fix https://bugs.launchpad.net/inkscape/+bug/1458200
+ // we increase the tolerance because no sensible data for panning
+ if (within_tolerance && (abs((gint) event->motion.x - xp)
+ < tolerance * 3) && (abs((gint) event->motion.y - yp)
+ < tolerance * 3)) {
+ // do not drag if we're within tolerance from origin
+ break;
+ }
+
+ // Once the user has moved farther than tolerance from
+ // the original location (indicating they intend to move
+ // the object, not click), then always process the motion
+ // notify coordinates as given (no snapping back to origin)
+ within_tolerance = false;
+
+ // gobble subsequent motion events to prevent "sticking"
+ // when scrolling is slow
+ gobble_motion_events(panning == 2 ? GDK_BUTTON2_MASK : (panning
+ == 1 ? GDK_BUTTON1_MASK : GDK_BUTTON3_MASK));
+
+ if (panning_cursor == 0) {
+ panning_cursor = 1;
+ this->sp_event_context_set_cursor(GDK_FLEUR);
+ }
+
+ Geom::Point const motion_w(event->motion.x, event->motion.y);
+ Geom::Point const moved_w(motion_w - button_w);
+ this->desktop->scroll_relative(moved_w, true); // we're still scrolling, do not redraw
+ ret = TRUE;
+ }
+ } else if (zoom_rb) {
+ Geom::Point const motion_w(event->motion.x, event->motion.y);
+ Geom::Point const motion_dt(desktop->w2d(motion_w));
+
+ if (within_tolerance && (abs((gint) event->motion.x - xp)
+ < tolerance) && (abs((gint) event->motion.y - yp)
+ < 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 move the object, not click), then always process the
+ // motion notify coordinates as given (no snapping back to origin)
+ within_tolerance = false;
+
+ if (Inkscape::Rubberband::get(desktop)->is_started()) {
+ Inkscape::Rubberband::get(desktop)->move(motion_dt);
+ } else {
+ Inkscape::Rubberband::get(desktop)->start(desktop, motion_dt);
+ }
+
+ if (zoom_rb == 2) {
+ gobble_motion_events(GDK_BUTTON2_MASK);
+ }
+ }
+ break;
+
+ case GDK_BUTTON_RELEASE: {
+ bool middle_mouse_zoom = prefs->getBool("/options/middlemousezoom/value");
+
+ xp = yp = 0;
+
+ if (panning_cursor == 1) {
+ panning_cursor = 0;
+ Gtk::Widget* w = Glib::wrap(GTK_WIDGET(desktop->getCanvas()));
+ w->get_window()->set_cursor(cursor);
+ }
+
+ if (middle_mouse_zoom && within_tolerance && (panning || zoom_rb)) {
+ zoom_rb = 0;
+
+ if (panning) {
+ panning = 0;
+ sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate));
+ }
+
+ Geom::Point const event_w(event->button.x, event->button.y);
+ Geom::Point const event_dt(desktop->w2d(event_w));
+
+ double const zoom_inc = prefs->getDoubleLimited(
+ "/options/zoomincrement/value", M_SQRT2, 1.01, 10);
+
+ desktop->zoom_relative_keep_point(event_dt, (event->button.state
+ & GDK_SHIFT_MASK) ? 1 / zoom_inc : zoom_inc);
+
+ desktop->updateNow();
+ ret = TRUE;
+ } else if (panning == event->button.button) {
+ panning = 0;
+ sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate));
+
+ // in slow complex drawings, some of the motion events are lost;
+ // to make up for this, we scroll it once again to the button-up event coordinates
+ // (i.e. canvas will always get scrolled all the way to the mouse release point,
+ // even if few intermediate steps were visible)
+ Geom::Point const motion_w(event->button.x, event->button.y);
+ Geom::Point const moved_w(motion_w - button_w);
+
+ this->desktop->scroll_relative(moved_w);
+ desktop->updateNow();
+ ret = TRUE;
+ } else if (zoom_rb == event->button.button) {
+ zoom_rb = 0;
+
+ Geom::OptRect const b = Inkscape::Rubberband::get(desktop)->getRectangle();
+ Inkscape::Rubberband::get(desktop)->stop();
+
+ if (b && !within_tolerance) {
+ desktop->set_display_area(*b, 10);
+ }
+
+ ret = TRUE;
+ }
+ }
+ break;
+
+ case GDK_KEY_PRESS: {
+ double const acceleration = prefs->getDoubleLimited(
+ "/options/scrollingacceleration/value", 0, 0, 6);
+ int const key_scroll = prefs->getIntLimited("/options/keyscroll/value",
+ 10, 0, 1000);
+
+ switch (get_latin_keyval(&event->key)) {
+ // GDK insists on stealing these keys (F1 for no idea what, tab for cycling widgets
+ // in the editing window). So we resteal them back and run our regular shortcut
+ // invoker on them.
+ unsigned int shortcut;
+ case GDK_KEY_Tab:
+ case GDK_KEY_ISO_Left_Tab:
+ case GDK_KEY_F1:
+ shortcut = sp_shortcut_get_for_event((GdkEventKey*)event);
+ ret = sp_shortcut_invoke(shortcut, desktop);
+ break;
+
+ case GDK_KEY_Q:
+ case GDK_KEY_q:
+ if (desktop->quick_zoomed()) {
+ ret = TRUE;
+ }
+ if (!MOD__SHIFT(event) && !MOD__CTRL(event) && !MOD__ALT(event)) {
+ desktop->zoom_quick(true);
+ ret = TRUE;
+ }
+ break;
+
+ case GDK_KEY_W:
+ case GDK_KEY_w:
+ case GDK_KEY_F4:
+ /* Close view */
+ if (MOD__CTRL_ONLY(event)) {
+ sp_ui_close_view(nullptr);
+ ret = TRUE;
+ }
+ break;
+
+ case GDK_KEY_Left: // Ctrl Left
+ case GDK_KEY_KP_Left:
+ case GDK_KEY_KP_4:
+ if (MOD__CTRL_ONLY(event)) {
+ int i = (int) floor(key_scroll * accelerate_scroll(event,
+ acceleration, desktop->getCanvas()));
+
+ gobble_key_events(get_latin_keyval(&event->key), GDK_CONTROL_MASK);
+ this->desktop->scroll_relative(Geom::Point(i, 0));
+ ret = TRUE;
+ } else {
+ ret = _keyboardMove(event->key, Geom::Point(-1, 0));
+ }
+ break;
+
+ case GDK_KEY_Up: // Ctrl Up
+ case GDK_KEY_KP_Up:
+ case GDK_KEY_KP_8:
+ if (MOD__CTRL_ONLY(event)) {
+ int i = (int) floor(key_scroll * accelerate_scroll(event,
+ acceleration, desktop->getCanvas()));
+
+ gobble_key_events(get_latin_keyval(&event->key), GDK_CONTROL_MASK);
+ this->desktop->scroll_relative(Geom::Point(0, i));
+ ret = TRUE;
+ } else {
+ ret = _keyboardMove(event->key, Geom::Point(0, -desktop->yaxisdir()));
+ }
+ break;
+
+ case GDK_KEY_Right: // Ctrl Right
+ case GDK_KEY_KP_Right:
+ case GDK_KEY_KP_6:
+ if (MOD__CTRL_ONLY(event)) {
+ int i = (int) floor(key_scroll * accelerate_scroll(event,
+ acceleration, desktop->getCanvas()));
+
+ gobble_key_events(get_latin_keyval(&event->key), GDK_CONTROL_MASK);
+ this->desktop->scroll_relative(Geom::Point(-i, 0));
+ ret = TRUE;
+ } else {
+ ret = _keyboardMove(event->key, Geom::Point(1, 0));
+ }
+ break;
+
+ case GDK_KEY_Down: // Ctrl Down
+ case GDK_KEY_KP_Down:
+ case GDK_KEY_KP_2:
+ if (MOD__CTRL_ONLY(event)) {
+ int i = (int) floor(key_scroll * accelerate_scroll(event,
+ acceleration, desktop->getCanvas()));
+
+ gobble_key_events(get_latin_keyval(&event->key), GDK_CONTROL_MASK);
+ this->desktop->scroll_relative(Geom::Point(0, -i));
+ ret = TRUE;
+ } else {
+ ret = _keyboardMove(event->key, Geom::Point(0, desktop->yaxisdir()));
+ }
+ break;
+
+ case GDK_KEY_Menu:
+ sp_event_root_menu_popup(desktop, nullptr, event);
+ ret = TRUE;
+ break;
+
+ case GDK_KEY_F10:
+ if (MOD__SHIFT_ONLY(event)) {
+ sp_event_root_menu_popup(desktop, nullptr, event);
+ ret = TRUE;
+ }
+ break;
+
+ case GDK_KEY_space:
+ within_tolerance = true;
+ xp = yp = 0;
+ if (!allow_panning) break;
+ panning = 4;
+ this->space_panning = true;
+ this->message_context->set(Inkscape::INFORMATION_MESSAGE,
+ _("<b>Space+mouse move</b> to pan canvas"));
+
+ ret = TRUE;
+ break;
+
+ case GDK_KEY_z:
+ case GDK_KEY_Z:
+ if (MOD__ALT_ONLY(event)) {
+ desktop->zoom_grab_focus();
+ ret = TRUE;
+ }
+ break;
+
+ default:
+ break;
+ }
+ }
+ break;
+
+ case GDK_KEY_RELEASE:
+ // Stop panning on any key release
+ if (this->space_panning) {
+ this->space_panning = false;
+ this->message_context->clear();
+ }
+
+ if (panning) {
+ panning = 0;
+ xp = yp = 0;
+
+ sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate));
+
+ desktop->updateNow();
+ }
+
+ if (panning_cursor == 1) {
+ panning_cursor = 0;
+ Gtk::Widget* w = Glib::wrap(GTK_WIDGET(desktop->getCanvas()));
+ w->get_window()->set_cursor(cursor);
+ }
+
+ switch (get_latin_keyval(&event->key)) {
+ case GDK_KEY_space:
+ if (within_tolerance) {
+ // Space was pressed, but not panned
+ sp_toggle_selector(desktop);
+
+ // Be careful, sp_toggle_selector will delete ourselves.
+ // Thus, make sure we return immediately.
+ return true;
+ }
+
+ break;
+
+ case GDK_KEY_Q:
+ case GDK_KEY_q:
+ if (desktop->quick_zoomed()) {
+ desktop->zoom_quick(false);
+ ret = TRUE;
+ }
+ break;
+
+ default:
+ break;
+ }
+ break;
+
+ case GDK_SCROLL: {
+ bool ctrl = (event->scroll.state & GDK_CONTROL_MASK);
+ bool shift = (event->scroll.state & GDK_SHIFT_MASK);
+ bool wheelzooms = prefs->getBool("/options/wheelzooms/value");
+
+ int constexpr WHEEL_SCROLL_DEFAULT = 40;
+ int const wheel_scroll = prefs->getIntLimited(
+ "/options/wheelscroll/value", WHEEL_SCROLL_DEFAULT, 0, 1000);
+
+ // Size of smooth-scrolls (only used in GTK+ 3)
+ gdouble delta_x = 0;
+ gdouble delta_y = 0;
+
+ if ((ctrl & shift) && !desktop->get_rotation_lock()) {
+ /* ctrl + shift, rotate */
+
+ double rotate_inc = prefs->getDoubleLimited(
+ "/options/rotateincrement/value", 15, 1, 90, "°" );
+ rotate_inc *= M_PI/180.0;
+
+ switch (event->scroll.direction) {
+ case GDK_SCROLL_UP:
+ // Do nothing
+ break;
+
+ case GDK_SCROLL_DOWN:
+ rotate_inc = -rotate_inc;
+ break;
+
+ case GDK_SCROLL_SMOOTH: {
+ gdk_event_get_scroll_deltas(event, &delta_x, &delta_y);
+#ifdef GDK_WINDOWING_QUARTZ
+ // MacBook trackpad scroll event gives pixel delta
+ delta_y /= WHEEL_SCROLL_DEFAULT;
+#endif
+ double delta_y_clamped = CLAMP(delta_y, -1.0, 1.0); // values > 1 result in excessive rotating
+ rotate_inc = rotate_inc * -delta_y_clamped;
+ break;
+ }
+
+ default:
+ rotate_inc = 0.0;
+ break;
+ }
+
+ if (rotate_inc != 0.0) {
+ Geom::Point const scroll_dt = desktop->point();
+ desktop->rotate_relative_keep_point(scroll_dt, rotate_inc);
+ }
+
+ } else if (shift && !ctrl) {
+ /* shift + wheel, pan left--right */
+
+ switch (event->scroll.direction) {
+ case GDK_SCROLL_UP:
+ case GDK_SCROLL_LEFT:
+ desktop->scroll_relative(Geom::Point(wheel_scroll, 0));
+ break;
+
+ case GDK_SCROLL_DOWN:
+ case GDK_SCROLL_RIGHT:
+ desktop->scroll_relative(Geom::Point(-wheel_scroll, 0));
+ break;
+
+ case GDK_SCROLL_SMOOTH: {
+ gdk_event_get_scroll_deltas(event, &delta_x, &delta_y);
+#ifdef GDK_WINDOWING_QUARTZ
+ // MacBook trackpad scroll event gives pixel delta
+ delta_y /= WHEEL_SCROLL_DEFAULT;
+#endif
+ desktop->scroll_relative(Geom::Point(wheel_scroll * -delta_y, 0));
+ break;
+ }
+
+ default:
+ break;
+ }
+
+ } else if ((ctrl && !wheelzooms) || (!ctrl && wheelzooms)) {
+ /* ctrl + wheel, zoom in--out */
+ double rel_zoom;
+ double const zoom_inc = prefs->getDoubleLimited(
+ "/options/zoomincrement/value", M_SQRT2, 1.01, 10);
+
+ switch (event->scroll.direction) {
+ case GDK_SCROLL_UP:
+ rel_zoom = zoom_inc;
+ break;
+
+ case GDK_SCROLL_DOWN:
+ rel_zoom = 1 / zoom_inc;
+ break;
+
+ case GDK_SCROLL_SMOOTH: {
+ gdk_event_get_scroll_deltas(event, &delta_x, &delta_y);
+#ifdef GDK_WINDOWING_QUARTZ
+ // MacBook trackpad scroll event gives pixel delta
+ delta_y /= WHEEL_SCROLL_DEFAULT;
+#endif
+ double delta_y_clamped = CLAMP(std::abs(delta_y), 0.0, 1.0); // values > 1 result in excessive zooming
+ double zoom_inc_scaled = (zoom_inc-1) * delta_y_clamped + 1;
+ if (delta_y < 0) {
+ rel_zoom = zoom_inc_scaled;
+ } else {
+ rel_zoom = 1 / zoom_inc_scaled;
+ }
+ break;
+ }
+
+ default:
+ rel_zoom = 0.0;
+ break;
+ }
+
+ if (rel_zoom != 0.0) {
+ Geom::Point const scroll_dt = desktop->point();
+ desktop->zoom_relative_keep_point(scroll_dt, rel_zoom);
+ }
+
+ /* no modifier, pan up--down (left--right on multiwheel mice?) */
+ } else {
+ switch (event->scroll.direction) {
+ case GDK_SCROLL_UP:
+ desktop->scroll_relative(Geom::Point(0, wheel_scroll));
+ break;
+
+ case GDK_SCROLL_DOWN:
+ desktop->scroll_relative(Geom::Point(0, -wheel_scroll));
+ break;
+
+ case GDK_SCROLL_LEFT:
+ desktop->scroll_relative(Geom::Point(wheel_scroll, 0));
+ break;
+
+ case GDK_SCROLL_RIGHT:
+ desktop->scroll_relative(Geom::Point(-wheel_scroll, 0));
+ break;
+
+ case GDK_SCROLL_SMOOTH:
+ gdk_event_get_scroll_deltas(event, &delta_x, &delta_y);
+#ifdef GDK_WINDOWING_QUARTZ
+ // MacBook trackpad scroll event gives pixel delta
+ delta_x /= WHEEL_SCROLL_DEFAULT;
+ delta_y /= WHEEL_SCROLL_DEFAULT;
+#endif
+ desktop->scroll_relative(Geom::Point(-wheel_scroll*delta_x, -wheel_scroll*delta_y));
+ break;
+ }
+ }
+ break;
+ }
+
+ default:
+ break;
+ }
+
+ return ret;
+}
+
+/**
+ * This function allow to handle global tool events if not _pre function is full overrided.
+ */
+
+bool ToolBase::block_button(GdkEvent *event)
+{
+ switch (event->type) {
+ case GDK_BUTTON_PRESS:
+ switch (event->button.button) {
+ case 1:
+ this->_button1on = true;
+ break;
+ case 2:
+ this->_button2on = true;
+ break;
+ case 3:
+ this->_button3on = true;
+ break;
+ }
+ break;
+ case GDK_BUTTON_RELEASE:
+ switch (event->button.button) {
+ case 1:
+ this->_button1on = false;
+ break;
+ case 2:
+ this->_button2on = false;
+ break;
+ case 3:
+ this->_button3on = false;
+ break;
+ }
+ break;
+ case GDK_MOTION_NOTIFY:
+ if (event->motion.state & Gdk::ModifierType::BUTTON1_MASK) {
+ this->_button1on = true;
+ } else {
+ this->_button1on = false;
+ }
+ if (event->motion.state & Gdk::ModifierType::BUTTON2_MASK) {
+ this->_button2on = true;
+ } else {
+ this->_button2on = false;
+ }
+ if (event->motion.state & Gdk::ModifierType::BUTTON3_MASK) {
+ this->_button3on = true;
+ } else {
+ this->_button3on = false;
+ }
+ }
+ if (this->_button1on == true && this->_button3on == true) {
+ return true;
+ }
+ return false;
+}
+
+/**
+ * Handles item specific events. Gets called from Gdk.
+ *
+ * Only reacts to right mouse button at the moment.
+ * \todo Fixme: do context sensitive popup menu on items.
+ */
+bool ToolBase::item_handler(SPItem* item, GdkEvent* event) {
+ int ret = FALSE;
+
+ switch (event->type) {
+ case GDK_BUTTON_PRESS:
+ if (event->button.button == 3 &&
+ !((event->button.state & GDK_SHIFT_MASK) || (event->button.state & GDK_CONTROL_MASK))) {
+ sp_event_root_menu_popup(this->desktop, item, event);
+ ret = TRUE;
+ }
+ break;
+
+ default:
+ break;
+ }
+
+ return ret;
+}
+
+/**
+ * Returns true if we're hovering above a knot (needed because we don't want to pre-snap in that case).
+ */
+bool ToolBase::sp_event_context_knot_mouseover() const {
+ if (this->shape_editor) {
+ return this->shape_editor->knot_mouseover();
+ }
+
+ return false;
+}
+
+/**
+ * Enables/disables the ToolBase's SelCue.
+ */
+void ToolBase::enableSelectionCue(bool enable) {
+ if (enable) {
+ if (!_selcue) {
+ _selcue = new Inkscape::SelCue(desktop);
+ }
+ } else {
+ delete _selcue;
+ _selcue = nullptr;
+ }
+}
+
+/**
+ * Enables/disables the ToolBase's GrDrag.
+ */
+void ToolBase::enableGrDrag(bool enable) {
+ if (enable) {
+ if (!_grdrag) {
+ _grdrag = new GrDrag(desktop);
+ }
+ } else {
+ if (_grdrag) {
+ delete _grdrag;
+ _grdrag = nullptr;
+ }
+ }
+}
+
+/**
+ * Delete a selected GrDrag point
+ */
+bool ToolBase::deleteSelectedDrag(bool just_one) {
+
+ if (_grdrag && !_grdrag->selected.empty()) {
+ _grdrag->deleteSelected(just_one);
+ return TRUE;
+ }
+
+ return FALSE;
+}
+
+/** Enable (or disable) high precision for motion events
+ *
+ * This is intended to be used by drawing tools, that need to process motion events with high accuracy
+ * and high update rate (for example free hand tools)
+ *
+ * With standard accuracy some intermediate motion events might be discarded
+ *
+ * Call this function when an operation that requires high accuracy is started (e.g. mouse button is pressed
+ * to draw a line). Make sure to call it again and restore standard precision afterwards. **/
+void ToolBase::set_high_motion_precision(bool high_precision) {
+ Glib::RefPtr<Gdk::Window> window = desktop->getToplevel()->get_window();
+
+ if (window) {
+ window->set_event_compression(!high_precision);
+ }
+}
+
+/**
+ * Calls virtual set() function of ToolBase.
+ */
+void sp_event_context_read(ToolBase *ec, gchar const *key) {
+ g_return_if_fail(ec != nullptr);
+ g_return_if_fail(SP_IS_EVENT_CONTEXT(ec));
+ g_return_if_fail(key != nullptr);
+
+ Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+ Inkscape::Preferences::Entry val = prefs->getEntry(ec->pref_observer->observed_path + '/' + key);
+ ec->set(val);
+}
+
+/**
+ * Calls virtual root_handler(), the main event handling function.
+ */
+gint sp_event_context_root_handler(ToolBase * event_context,
+ GdkEvent * event)
+{
+
+ if (!event_context->_uses_snap) {
+ return sp_event_context_virtual_root_handler(event_context, event);
+ }
+
+ switch (event->type) {
+ case GDK_MOTION_NOTIFY:
+ sp_event_context_snap_delay_handler(event_context, nullptr, nullptr,
+ (GdkEventMotion *) event,
+ DelayedSnapEvent::EVENTCONTEXT_ROOT_HANDLER);
+ break;
+ case GDK_BUTTON_RELEASE:
+ if (event_context && event_context->_delayed_snap_event) {
+ // If we have any pending snapping action, then invoke it now
+ sp_event_context_snap_watchdog_callback(
+ event_context->_delayed_snap_event);
+ }
+ break;
+ case GDK_BUTTON_PRESS:
+ case GDK_2BUTTON_PRESS:
+ case GDK_3BUTTON_PRESS:
+ // Snapping will be on hold if we're moving the mouse at high speeds. When starting
+ // drawing a new shape we really should snap though.
+ event_context->desktop->namedview->snap_manager.snapprefs.setSnapPostponedGlobally(false);
+ break;
+ default:
+ break;
+ }
+
+ return sp_event_context_virtual_root_handler(event_context, event);
+}
+
+gint sp_event_context_virtual_root_handler(ToolBase * event_context, GdkEvent * event) {
+ gint ret = false;
+
+ if (event_context) {
+
+ if (event_context->block_button(event)) {
+ return false;
+ }
+ SPDesktop* desktop = event_context->desktop;
+ ret = event_context->root_handler(event);
+
+ set_event_location(desktop, event);
+ }
+
+ return ret;
+}
+
+/**
+ * Calls virtual item_handler(), the item event handling function.
+ */
+gint sp_event_context_item_handler(ToolBase * event_context,
+ SPItem * item, GdkEvent * event)
+{
+ if (!event_context->_uses_snap) {
+ return sp_event_context_virtual_item_handler(event_context, item, event);
+ }
+
+ switch (event->type) {
+ case GDK_MOTION_NOTIFY:
+ sp_event_context_snap_delay_handler(event_context, (gpointer) item, nullptr, (GdkEventMotion *) event, DelayedSnapEvent::EVENTCONTEXT_ITEM_HANDLER);
+ break;
+ case GDK_BUTTON_RELEASE:
+ if (event_context && event_context->_delayed_snap_event) {
+ // If we have any pending snapping action, then invoke it now
+ sp_event_context_snap_watchdog_callback(event_context->_delayed_snap_event);
+ }
+ break;
+ case GDK_BUTTON_PRESS:
+ case GDK_2BUTTON_PRESS:
+ case GDK_3BUTTON_PRESS:
+ // Snapping will be on hold if we're moving the mouse at high speeds. When starting
+ // drawing a new shape we really should snap though.
+ event_context->desktop->namedview->snap_manager.snapprefs.setSnapPostponedGlobally(false);
+ break;
+ default:
+ break;
+ }
+
+ return sp_event_context_virtual_item_handler(event_context, item, event);
+}
+
+gint sp_event_context_virtual_item_handler(ToolBase * event_context, SPItem * item, GdkEvent * event) {
+ gint ret = false;
+ if (event_context) { // If no event-context is available then do nothing, otherwise Inkscape would crash
+ // (see the comment in SPDesktop::set_event_context, and bug LP #622350)
+ if (event_context->block_button(event)) {
+ return false;
+ }
+ // et = (SP_EVENT_CONTEXT_CLASS(G_OBJECT_GET_CLASS(event_context)))->item_handler(event_context, item, event);
+ ret = event_context->item_handler(item, event);
+
+ if (!ret) {
+ ret = sp_event_context_virtual_root_handler(event_context, event);
+ } else {
+ set_event_location(event_context->desktop, event);
+ }
+ }
+
+ return ret;
+}
+
+/**
+ * Shows coordinates on status bar.
+ */
+static void set_event_location(SPDesktop *desktop, GdkEvent *event) {
+ if (event->type != GDK_MOTION_NOTIFY) {
+ return;
+ }
+
+ Geom::Point const button_w(event->button.x, event->button.y);
+ Geom::Point const button_dt(desktop->w2d(button_w));
+ desktop->set_coordinate_status(button_dt);
+}
+
+//-------------------------------------------------------------------
+/**
+ * Create popup menu and tell Gtk to show it.
+ */
+void sp_event_root_menu_popup(SPDesktop *desktop, SPItem *item, GdkEvent *event) {
+
+ // It seems the param item is the SPItem at the bottom of the z-order
+ // Using the same function call used on left click in sp_select_context_item_handler() to get top of z-order
+ // fixme: sp_canvas_arena should set the top z-order object as arena->active
+ item = sp_event_context_find_item (desktop,
+ Geom::Point(event->button.x, event->button.y), FALSE, FALSE);
+
+ if (event->type == GDK_KEY_PRESS && !desktop->getSelection()->isEmpty()) {
+ item = desktop->getSelection()->items().front();
+ }
+
+ ContextMenu* CM = new ContextMenu(desktop, item);
+ Gtk::Window *window = SP_ACTIVE_DESKTOP->getToplevel();
+ if (window) {
+ if (window->get_style_context()->has_class("dark")) {
+ CM->get_style_context()->add_class("dark");
+ } else {
+ CM->get_style_context()->add_class("bright");
+ }
+ Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+ if (prefs->getBool("/theme/symbolicIcons", false)) {
+ CM->get_style_context()->add_class("symbolic");
+ } else {
+ CM->get_style_context()->add_class("regular");
+ }
+ }
+ CM->show();
+
+
+ switch (event->type) {
+ case GDK_BUTTON_PRESS:
+ case GDK_KEY_PRESS:
+ CM->popup_at_pointer(event);
+ break;
+ default:
+ break;
+ }
+}
+
+/**
+ * Show tool context specific modifier tip.
+ */
+void sp_event_show_modifier_tip(Inkscape::MessageContext *message_context,
+ GdkEvent *event, gchar const *ctrl_tip, gchar const *shift_tip,
+ gchar const *alt_tip) {
+ guint keyval = get_latin_keyval(&event->key);
+
+ bool ctrl = ctrl_tip && (MOD__CTRL(event) || (keyval == GDK_KEY_Control_L) || (keyval
+ == GDK_KEY_Control_R));
+ bool shift = shift_tip && (MOD__SHIFT(event) || (keyval == GDK_KEY_Shift_L) || (keyval
+ == GDK_KEY_Shift_R));
+ bool alt = alt_tip && (MOD__ALT(event) || (keyval == GDK_KEY_Alt_L) || (keyval
+ == GDK_KEY_Alt_R) || (keyval == GDK_KEY_Meta_L) || (keyval == GDK_KEY_Meta_R));
+
+ gchar *tip = g_strdup_printf("%s%s%s%s%s", (ctrl ? ctrl_tip : ""), (ctrl
+ && (shift || alt) ? "; " : ""), (shift ? shift_tip : ""), ((ctrl
+ || shift) && alt ? "; " : ""), (alt ? alt_tip : ""));
+
+ if (strlen(tip) > 0) {
+ message_context->flash(Inkscape::INFORMATION_MESSAGE, tip);
+ }
+
+ g_free(tip);
+}
+
+/**
+ * Try to determine the keys group of Latin layout.
+ * Check available keymap entries for Latin 'a' key and find the minimal integer value.
+ */
+static void update_latin_keys_group() {
+ GdkKeymapKey* keys;
+ gint n_keys;
+
+ latin_keys_group_valid = FALSE;
+ if (gdk_keymap_get_entries_for_keyval(Gdk::Display::get_default()->get_keymap(), GDK_KEY_a, &keys, &n_keys)) {
+ for (gint i = 0; i < n_keys; i++) {
+ if (!latin_keys_group_valid || keys[i].group < latin_keys_group) {
+ latin_keys_group = keys[i].group;
+ latin_keys_group_valid = TRUE;
+ }
+ }
+ g_free(keys);
+ }
+}
+
+/**
+ * Initialize Latin keys group handling.
+ */
+void init_latin_keys_group() {
+ g_signal_connect(G_OBJECT(Gdk::Display::get_default()->get_keymap()),
+ "keys-changed", G_CALLBACK(update_latin_keys_group), NULL);
+ update_latin_keys_group();
+}
+
+/**
+ * Return the keyval corresponding to the key event in Latin group.
+ *
+ * Use this instead of simply event->keyval, so that your keyboard shortcuts
+ * work regardless of layouts (e.g., in Cyrillic).
+ */
+guint get_latin_keyval(GdkEventKey const *event, guint *consumed_modifiers /*= NULL*/) {
+ guint keyval = 0;
+ GdkModifierType modifiers;
+ gint group = latin_keys_group_valid ? latin_keys_group : event->group;
+
+ gdk_keymap_translate_keyboard_state(
+ Gdk::Display::get_default()->get_keymap(),
+ event->hardware_keycode, (GdkModifierType) event->state, group,
+ &keyval, nullptr, nullptr, &modifiers);
+
+ if (consumed_modifiers) {
+#ifndef GDK_WINDOWING_QUARTZ
+ *consumed_modifiers = modifiers;
+#else
+ // gdk_quartz_keymap_translate_keyboard_state fills the `consumed_modifiers`
+ // incorrectly, e.g. assigns 0xB instead of 0x0 when no modifiers pressed.
+
+ *consumed_modifiers = 0;
+
+ for (unsigned mod = 1, statemask = (event->state & GDK_MODIFIER_MASK); mod <= statemask; mod <<= 1) {
+ if ((mod & statemask)) {
+ guint keyval_no_mod = 0;
+ gdk_keymap_translate_keyboard_state(Gdk::Display::get_default()->get_keymap(), event->hardware_keycode,
+ (GdkModifierType)(event->state & ~mod), group, &keyval_no_mod,
+ nullptr, nullptr, nullptr);
+ if (keyval_no_mod != keyval) {
+ *consumed_modifiers |= mod;
+ }
+ }
+ }
+#endif
+ }
+ return keyval;
+}
+
+/**
+ * Returns item at point p in desktop.
+ *
+ * If state includes alt key mask, cyclically selects under; honors
+ * into_groups.
+ */
+SPItem *sp_event_context_find_item(SPDesktop *desktop, Geom::Point const &p,
+ bool select_under, bool into_groups)
+{
+ SPItem *item = nullptr;
+
+ if (select_under) {
+ auto tmp = desktop->selection->items();
+ std::vector<SPItem *> vec(tmp.begin(), tmp.end());
+ SPItem *selected_at_point = desktop->getItemFromListAtPointBottom(vec, p);
+ item = desktop->getItemAtPoint(p, into_groups, selected_at_point);
+ if (item == nullptr) { // we may have reached bottom, flip over to the top
+ item = desktop->getItemAtPoint(p, into_groups, nullptr);
+ }
+ } else {
+ item = desktop->getItemAtPoint(p, into_groups, nullptr);
+ }
+
+ return item;
+}
+
+/**
+ * Returns item if it is under point p in desktop, at any depth; otherwise returns NULL.
+ *
+ * Honors into_groups.
+ */
+SPItem *
+sp_event_context_over_item(SPDesktop *desktop, SPItem *item,
+ Geom::Point const &p) {
+ std::vector<SPItem*> temp;
+ temp.push_back(item);
+ SPItem *item_at_point = desktop->getItemFromListAtPointBottom(temp, p);
+ return item_at_point;
+}
+
+ShapeEditor *
+sp_event_context_get_shape_editor(ToolBase *ec) {
+ return ec->shape_editor;
+}
+
+
+/**
+ * Analyses the current event, calculates the mouse speed, turns snapping off (temporarily) if the
+ * mouse speed is above a threshold, and stores the current event such that it can be re-triggered when needed
+ * (re-triggering is controlled by a watchdog timer).
+ *
+ * @param ec Pointer to the event context.
+ * @param dse_item Pointer that store a reference to a canvas or to an item.
+ * @param dse_item2 Another pointer, storing a reference to a knot or controlpoint.
+ * @param event Pointer to the motion event.
+ * @param origin Identifier (enum) specifying where the delay (and the call to this method) were initiated.
+ */
+void sp_event_context_snap_delay_handler(ToolBase *ec,
+ gpointer const dse_item, gpointer const dse_item2, GdkEventMotion *event,
+ DelayedSnapEvent::DelayedSnapEventOrigin origin)
+{
+ static guint32 prev_time;
+ static boost::optional<Geom::Point> prev_pos;
+
+ if (!ec->_uses_snap || ec->_dse_callback_in_process) {
+ return;
+ }
+
+ // Snapping occurs when dragging with the left mouse button down, or when hovering e.g. in the pen tool with left mouse button up
+ bool const c1 = event->state & GDK_BUTTON2_MASK; // We shouldn't hold back any events when other mouse buttons have been
+ bool const c2 = event->state & GDK_BUTTON3_MASK; // pressed, e.g. when scrolling with the middle mouse button; if we do then
+ // Inkscape will get stuck in an unresponsive state
+ bool const c3 = tools_isactive(ec->desktop, TOOLS_CALLIGRAPHIC);
+ // The snap delay will repeat the last motion event, which will lead to
+ // erroneous points in the calligraphy context. And because we don't snap
+ // in this context, we might just as well disable the snap delay all together
+ bool const c4 = ec->space_panning; // Don't snap while panning with the spacebar
+
+ if (c1 || c2 || c3 || c4) {
+ // Make sure that we don't send any pending snap events to a context if we know in advance
+ // that we're not going to snap any way (e.g. while scrolling with middle mouse button)
+ // Any motion event might affect the state of the context, leading to unexpected behavior
+ sp_event_context_discard_delayed_snap_event(ec);
+ } else if (ec->desktop
+ && ec->desktop->namedview->snap_manager.snapprefs.getSnapEnabledGlobally()) {
+ // Snap when speed drops below e.g. 0.02 px/msec, or when no motion events have occurred for some period.
+ // i.e. snap when we're at stand still. A speed threshold enforces snapping for tablets, which might never
+ // be fully at stand still and might keep spitting out motion events.
+ ec->desktop->namedview->snap_manager.snapprefs.setSnapPostponedGlobally(true); // put snapping on hold
+
+ Geom::Point event_pos(event->x, event->y);
+ guint32 event_t = gdk_event_get_time((GdkEvent *) event);
+
+ if (prev_pos) {
+ Geom::Coord dist = Geom::L2(event_pos - *prev_pos);
+ guint32 delta_t = event_t - prev_time;
+ gdouble speed = delta_t > 0 ? dist / delta_t : 1000;
+ //std::cout << "Mouse speed = " << speed << " px/msec " << std::endl;
+ if (speed > 0.02) { // Jitter threshold, might be needed for tablets
+ // We're moving fast, so postpone any snapping until the next GDK_MOTION_NOTIFY event. We
+ // will keep on postponing the snapping as long as the speed is high.
+ // We must snap at some point in time though, so set a watchdog timer at some time from
+ // now, just in case there's no future motion event that drops under the speed limit (when
+ // stopping abruptly)
+ delete ec->_delayed_snap_event;
+ ec->_delayed_snap_event = new DelayedSnapEvent(ec, dse_item, dse_item2, event, origin); // watchdog is reset, i.e. pushed forward in time
+ // If the watchdog expires before a new motion event is received, we will snap (as explained
+ // above). This means however that when the timer is too short, we will always snap and that the
+ // speed threshold is ineffective. In the extreme case the delay is set to zero, and snapping will
+ // be immediate, as it used to be in the old days ;-).
+ } else { // Speed is very low, so we're virtually at stand still
+ // But if we're really standing still, then we should snap now. We could use some low-pass filtering,
+ // otherwise snapping occurs for each jitter movement. For this filtering we'll leave the watchdog to expire,
+ // snap, and set a new watchdog again.
+ if (ec->_delayed_snap_event == nullptr) { // no watchdog has been set
+ // it might have already expired, so we'll set a new one; the snapping frequency will be limited this way
+ ec->_delayed_snap_event = new DelayedSnapEvent(ec, dse_item, dse_item2, event, origin);
+ } // else: watchdog has been set before and we'll wait for it to expire
+ }
+ } else {
+ // This is the first GDK_MOTION_NOTIFY event, so postpone snapping and set the watchdog
+ g_assert(ec->_delayed_snap_event == nullptr);
+ ec->_delayed_snap_event = new DelayedSnapEvent(ec, dse_item, dse_item2, event, origin);
+ }
+
+ prev_pos = event_pos;
+ prev_time = event_t;
+ }
+}
+
+/**
+ * When the snap delay watchdog timer barks, this method will be called and will re-inject the last motion
+ * event in an appropriate place, with snapping being turned on again.
+ */
+gboolean sp_event_context_snap_watchdog_callback(gpointer data) {
+ // Snap NOW! For this the "postponed" flag will be reset and the last motion event will be repeated
+ DelayedSnapEvent *dse = reinterpret_cast<DelayedSnapEvent*> (data);
+
+ if (dse == nullptr) {
+ // This might occur when this method is called directly, i.e. not through the timer
+ // E.g. on GDK_BUTTON_RELEASE in sp_event_context_root_handler()
+ return FALSE;
+ }
+
+ ToolBase *ec = dse->getEventContext();
+ if (ec == nullptr) {
+ delete dse;
+ return false;
+ }
+ if (ec->desktop == nullptr) {
+ ec->_delayed_snap_event = nullptr;
+ delete dse;
+ return false;
+ }
+
+ ec->_dse_callback_in_process = true;
+
+ SPDesktop *dt = ec->desktop;
+ dt->namedview->snap_manager.snapprefs.setSnapPostponedGlobally(false);
+
+ // Depending on where the delayed snap event originated from, we will inject it back at it's origin
+ // The switch below takes care of that and prepares the relevant parameters
+ switch (dse->getOrigin()) {
+ case DelayedSnapEvent::EVENTCONTEXT_ROOT_HANDLER:
+ sp_event_context_virtual_root_handler(ec, dse->getEvent());
+ break;
+ case DelayedSnapEvent::EVENTCONTEXT_ITEM_HANDLER: {
+ gpointer item = dse->getItem();
+ if (item && SP_IS_ITEM(item)) {
+ sp_event_context_virtual_item_handler(ec, SP_ITEM(item), dse->getEvent());
+ }
+ }
+ break;
+ case DelayedSnapEvent::KNOT_HANDLER: {
+ gpointer knot = dse->getItem2();
+ check_if_knot_deleted(knot);
+ if (knot && SP_IS_KNOT(knot)) {
+ sp_knot_handler_request_position(dse->getEvent(), SP_KNOT(knot));
+ }
+ }
+ break;
+ case DelayedSnapEvent::CONTROL_POINT_HANDLER: {
+ using Inkscape::UI::ControlPoint;
+ gpointer pitem2 = dse->getItem2();
+ if (!pitem2)
+ {
+ ec->_delayed_snap_event = nullptr;
+ delete dse;
+ return false;
+ }
+ ControlPoint *point = reinterpret_cast<ControlPoint*> (pitem2);
+ if (point) {
+ if (point->position().isFinite() && (dt == point->_desktop)) {
+ point->_eventHandler(ec, dse->getEvent());
+ }
+ else {
+ //workaround:
+ //[Bug 781893] Crash after moving a Bezier node after Knot path effect?
+ // --> at some time, some point with X = 0 and Y = nan (not a number) is created ...
+ // even so, the desktop pointer is invalid and equal to 0xff
+ g_warning ("encountered non finite point when evaluating snapping callback");
+ }
+ }
+ }
+ break;
+ case DelayedSnapEvent::GUIDE_HANDLER: {
+ gpointer item = dse->getItem();
+ gpointer item2 = dse->getItem2();
+ if (item && item2) {
+ g_assert(SP_IS_CANVAS_ITEM(item));
+ g_assert(SP_IS_GUIDE(item2));
+ sp_dt_guide_event(SP_CANVAS_ITEM(item), dse->getEvent(), item2);
+ }
+ }
+ break;
+ case DelayedSnapEvent::GUIDE_HRULER:
+ case DelayedSnapEvent::GUIDE_VRULER: {
+ gpointer item = dse->getItem();
+ gpointer item2 = dse->getItem2();
+ if (item && item2) {
+ g_assert(GTK_IS_WIDGET(item));
+ g_assert(SP_IS_DESKTOP_WIDGET(item2));
+ if (dse->getOrigin() == DelayedSnapEvent::GUIDE_HRULER) {
+ SPDesktopWidget::ruler_event(GTK_WIDGET(item), dse->getEvent(), SP_DESKTOP_WIDGET(item2), true);
+ } else {
+ SPDesktopWidget::ruler_event(GTK_WIDGET(item), dse->getEvent(), SP_DESKTOP_WIDGET(item2), false);
+ }
+ }
+ }
+ break;
+ default:
+ g_warning("Origin of snap-delay event has not been defined!;");
+ break;
+ }
+
+ ec->_delayed_snap_event = nullptr;
+ delete dse;
+
+ ec->_dse_callback_in_process = false;
+
+ return FALSE; //Kills the timer and stops it from executing this callback over and over again.
+}
+
+void sp_event_context_discard_delayed_snap_event(ToolBase *ec) {
+ delete ec->_delayed_snap_event;
+ ec->_delayed_snap_event = nullptr;
+ ec->desktop->namedview->snap_manager.snapprefs.setSnapPostponedGlobally(false);
+}
+
+}
+}
+}
+
+/*
+ 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 :