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-rw-r--r--src/ui/knot/knot.cpp520
1 files changed, 520 insertions, 0 deletions
diff --git a/src/ui/knot/knot.cpp b/src/ui/knot/knot.cpp
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+++ b/src/ui/knot/knot.cpp
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * SPKnot implementation
+ *
+ * Authors:
+ * Lauris Kaplinski <lauris@kaplinski.com>
+ * bulia byak <buliabyak@users.sf.net>
+ * Abhishek Sharma
+ *
+ * Copyright (C) 1999-2005 authors
+ * Copyright (C) 2001-2002 Ximian, Inc.
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifdef HAVE_CONFIG_H
+#endif
+#include <gdk/gdkkeysyms.h>
+#include <glibmm/i18n.h>
+
+#include "desktop.h"
+
+#include "knot.h"
+#include "knot-ptr.h"
+#include "document.h"
+#include "document-undo.h"
+#include "message-stack.h"
+#include "message-context.h"
+
+#include "display/control/canvas-item-ctrl.h"
+#include "ui/tools/tool-base.h"
+#include "ui/tools/node-tool.h"
+#include "ui/widget/canvas.h"
+
+using Inkscape::DocumentUndo;
+
+Gdk::EventMask KNOT_EVENT_MASK (
+ Gdk::BUTTON_PRESS_MASK |
+ Gdk::BUTTON_RELEASE_MASK |
+ Gdk::POINTER_MOTION_MASK |
+ Gdk::KEY_PRESS_MASK |
+ Gdk::KEY_RELEASE_MASK);
+
+const gchar *nograbenv = getenv("INKSCAPE_NO_GRAB");
+static bool nograb = (nograbenv && *nograbenv && (*nograbenv != '0'));
+
+
+void knot_ref(SPKnot* knot) {
+ knot->ref_count++;
+}
+
+void knot_unref(SPKnot* knot) {
+ if (--knot->ref_count < 1) {
+ delete knot;
+ }
+}
+
+SPKnot::SPKnot(SPDesktop *desktop, gchar const *tip, Inkscape::CanvasItemCtrlType type, Glib::ustring const & name)
+ : desktop(desktop)
+ , ref_count(1)
+{
+ if (tip) {
+ this->tip = g_strdup (tip);
+ }
+
+ fill[SP_KNOT_STATE_NORMAL] = 0xffffff00;
+ fill[SP_KNOT_STATE_MOUSEOVER] = 0xff0000ff;
+ fill[SP_KNOT_STATE_DRAGGING] = 0xff0000ff;
+ fill[SP_KNOT_STATE_SELECTED] = 0x0000ffff;
+
+ stroke[SP_KNOT_STATE_NORMAL] = 0x01000000;
+ stroke[SP_KNOT_STATE_MOUSEOVER] = 0x01000000;
+ stroke[SP_KNOT_STATE_DRAGGING] = 0x01000000;
+ stroke[SP_KNOT_STATE_SELECTED] = 0x01000000;
+
+ image[SP_KNOT_STATE_NORMAL] = nullptr;
+ image[SP_KNOT_STATE_MOUSEOVER] = nullptr;
+ image[SP_KNOT_STATE_DRAGGING] = nullptr;
+ image[SP_KNOT_STATE_SELECTED] = nullptr;
+
+ ctrl = new Inkscape::CanvasItemCtrl(desktop->getCanvasControls(), type); // Shape, mode set
+ Glib::ustring ctrl_name = "CanvasItemCtrl:Knot: " + name;
+ ctrl->set_name(ctrl_name);
+
+ // Are these needed?
+ ctrl->set_fill(0xffffff00);
+ ctrl->set_stroke(0x01000000);
+
+ _event_connection = ctrl->connect_event(sigc::mem_fun(this, &SPKnot::eventHandler));
+
+ knot_created_callback(this);
+}
+
+SPKnot::~SPKnot() {
+ auto display = gdk_display_get_default();
+ auto seat = gdk_display_get_default_seat(display);
+ auto device = gdk_seat_get_pointer(seat);
+
+ if ((this->flags & SP_KNOT_GRABBED) && gdk_display_device_is_grabbed(display, device)) {
+ // This happens e.g. when deleting a node in node tool while dragging it
+ gdk_seat_ungrab(seat);
+ }
+
+ if (ctrl) {
+ delete ctrl;
+ }
+
+ if (this->tip) {
+ g_free(this->tip);
+ this->tip = nullptr;
+ }
+
+ // FIXME: cannot snap to destroyed knot (lp:1309050)
+ // this->desktop->event_context->discard_delayed_snap_event();
+ knot_deleted_callback(this);
+}
+
+void SPKnot::startDragging(Geom::Point const &p, gint x, gint y, guint32 etime) {
+ // save drag origin
+ xp = x;
+ yp = y;
+ within_tolerance = true;
+
+ this->grabbed_rel_pos = p - this->pos;
+ this->drag_origin = this->pos;
+
+ if (!nograb && ctrl) {
+ ctrl->grab(KNOT_EVENT_MASK, _cursors[SP_KNOT_STATE_DRAGGING]);
+ }
+ this->setFlag(SP_KNOT_GRABBED, true);
+
+ grabbed = true;
+}
+
+void SPKnot::selectKnot(bool select){
+ setFlag(SP_KNOT_SELECTED, select);
+}
+
+bool SPKnot::eventHandler(GdkEvent *event)
+{
+ /* Run client universal event handler, if present */
+ bool consumed = event_signal.emit(this, event);
+ if (consumed) {
+ return true;
+ }
+
+ bool key_press_event_unconsumed = false;
+
+ ref_count++;
+
+ Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+ tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
+
+ switch (event->type) {
+ case GDK_2BUTTON_PRESS:
+ if (event->button.button == 1) {
+ doubleclicked_signal.emit(this, event->button.state);
+
+ grabbed = false;
+ moved = false;
+ consumed = true;
+ }
+ break;
+ case GDK_BUTTON_PRESS:
+ if ((event->button.button == 1) && desktop && desktop->event_context && !desktop->event_context->is_space_panning()) {
+ Geom::Point const p = desktop->w2d(Geom::Point(event->button.x, event->button.y));
+ startDragging(p, (gint) event->button.x, (gint) event->button.y, event->button.time);
+ mousedown_signal.emit(this, event->button.state);
+ consumed = true;
+ }
+ break;
+ case GDK_BUTTON_RELEASE:
+ if (event->button.button == 1 &&
+ desktop &&
+ desktop->event_context &&
+ !desktop->event_context->is_space_panning()) {
+
+ // If we have any pending snap event, then invoke it now
+ if (desktop->event_context->_delayed_snap_event) {
+ sp_event_context_snap_watchdog_callback(desktop->event_context->_delayed_snap_event);
+ }
+ desktop->event_context->discard_delayed_snap_event();
+ pressure = 0;
+
+ if (transform_escaped) {
+ transform_escaped = false;
+ consumed = true;
+ } else {
+ setFlag(SP_KNOT_GRABBED, false);
+
+ if (!nograb && ctrl) {
+ ctrl->ungrab();
+ }
+
+ if (moved) {
+ setFlag(SP_KNOT_DRAGGING, false);
+ ungrabbed_signal.emit(this, event->button.state);
+ } else {
+ click_signal.emit(this, event->button.state);
+ }
+
+ grabbed = false;
+ moved = false;
+ consumed = true;
+ }
+ }
+ Inkscape::UI::Tools::sp_update_helperpath(desktop);
+ break;
+
+ case GDK_MOTION_NOTIFY:
+
+ if (!(event->motion.state & GDK_BUTTON1_MASK) && flags & SP_KNOT_DRAGGING) {
+ pressure = 0;
+
+ if (transform_escaped) {
+ transform_escaped = false;
+ consumed = true;
+ } else {
+ setFlag(SP_KNOT_GRABBED, false);
+
+ if (!nograb && ctrl) {
+ ctrl->ungrab();
+ }
+
+ if (moved) {
+ setFlag(SP_KNOT_DRAGGING, false);
+ ungrabbed_signal.emit(this, event->motion.state);
+ } else {
+ click_signal.emit(this, event->motion.state);
+ }
+
+ grabbed = false;
+ moved = false;
+ consumed = true;
+ Inkscape::UI::Tools::sp_update_helperpath(desktop);
+ }
+ } else if (grabbed && desktop && desktop->event_context &&
+ !desktop->event_context->is_space_panning()) {
+ consumed = true;
+
+ 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 (gdk_event_get_axis (event, GDK_AXIS_PRESSURE, &pressure)) {
+ pressure = CLAMP (pressure, 0, 1);
+ } else {
+ pressure = 0.5;
+ }
+
+ if (!moved) {
+ setFlag(SP_KNOT_DRAGGING, true);
+ grabbed_signal.emit(this, event->button.state);
+ }
+
+ sp_event_context_snap_delay_handler(desktop->event_context, nullptr, this, (GdkEventMotion *)event, Inkscape::UI::Tools::DelayedSnapEvent::KNOT_HANDLER);
+ sp_knot_handler_request_position(event, this);
+ moved = true;
+ }
+ break;
+ case GDK_ENTER_NOTIFY:
+ setFlag(SP_KNOT_MOUSEOVER, true);
+ setFlag(SP_KNOT_GRABBED, false);
+
+ if (tip && desktop && desktop->event_context) {
+ desktop->event_context->defaultMessageContext()->set(Inkscape::NORMAL_MESSAGE, tip);
+ }
+ desktop->event_context->use_cursor(_cursors[SP_KNOT_STATE_MOUSEOVER]);
+
+ grabbed = false;
+ moved = false;
+ consumed = true;
+ break;
+ case GDK_LEAVE_NOTIFY:
+ setFlag(SP_KNOT_MOUSEOVER, false);
+ setFlag(SP_KNOT_GRABBED, false);
+
+ if (tip && desktop && desktop->event_context) {
+ desktop->event_context->defaultMessageContext()->clear();
+ }
+ desktop->event_context->use_cursor(_cursors[SP_KNOT_STATE_NORMAL]);
+
+ grabbed = false;
+ moved = false;
+ consumed = true;
+ break;
+ case GDK_KEY_PRESS: // keybindings for knot
+ switch (Inkscape::UI::Tools::get_latin_keyval(&event->key)) {
+ case GDK_KEY_Escape:
+ setFlag(SP_KNOT_GRABBED, false);
+
+ if (!nograb && ctrl) {
+ ctrl->ungrab();
+ }
+
+ if (moved) {
+ setFlag(SP_KNOT_DRAGGING, false);
+
+ ungrabbed_signal.emit(this, event->button.state);
+
+ DocumentUndo::undo(desktop->getDocument());
+ desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Node or handle drag canceled."));
+ transform_escaped = true;
+ consumed = true;
+ }
+
+ grabbed = false;
+ moved = false;
+
+ desktop->event_context->discard_delayed_snap_event();
+ break;
+ default:
+ consumed = false;
+ key_press_event_unconsumed = true;
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+
+ knot_unref(this);
+
+ if (key_press_event_unconsumed) {
+ return false; // e.g. in case "%" was pressed to toggle snapping, or Q for quick zoom (while dragging a handle)
+ } else {
+ return consumed || grabbed;
+ }
+}
+
+void sp_knot_handler_request_position(GdkEvent *event, SPKnot *knot) {
+ Geom::Point const motion_w(event->motion.x, event->motion.y);
+ Geom::Point const motion_dt = knot->desktop->w2d(motion_w);
+ Geom::Point p = motion_dt - knot->grabbed_rel_pos;
+
+ knot->requestPosition(p, event->motion.state);
+ knot->desktop->scroll_to_point (motion_dt);
+ knot->desktop->set_coordinate_status(knot->pos); // display the coordinate of knot, not cursor - they may be different!
+
+ if (event->motion.state & GDK_BUTTON1_MASK) {
+ knot->desktop->canvas->gobble_motion_events(GDK_BUTTON1_MASK);
+ }
+}
+
+void SPKnot::show() {
+ this->setFlag(SP_KNOT_VISIBLE, true);
+}
+
+void SPKnot::hide() {
+ this->setFlag(SP_KNOT_VISIBLE, false);
+}
+
+void SPKnot::requestPosition(Geom::Point const &p, guint state) {
+ bool done = this->request_signal.emit(this, &const_cast<Geom::Point&>(p), state);
+
+ /* If user did not complete, we simply move knot to new position */
+ if (!done) {
+ this->setPosition(p, state);
+ }
+}
+
+void SPKnot::setPosition(Geom::Point const &p, guint state) {
+ this->pos = p;
+
+ if (ctrl) {
+ ctrl->set_position(p);
+ }
+
+ this->moved_signal.emit(this, p, state);
+}
+
+void SPKnot::moveto(Geom::Point const &p) {
+ this->pos = p;
+
+ if (ctrl) {
+ ctrl->set_position(p);
+ }
+}
+
+Geom::Point SPKnot::position() const {
+ return this->pos;
+}
+
+void SPKnot::setFlag(guint flag, bool set) {
+ if (set) {
+ this->flags |= flag;
+ } else {
+ this->flags &= ~flag;
+ }
+
+ switch (flag) {
+ case SP_KNOT_VISIBLE:
+ if (set) {
+ if (ctrl) {
+ ctrl->show();
+ }
+ } else {
+ if (ctrl) {
+ ctrl->hide();
+ }
+ }
+ break;
+ case SP_KNOT_MOUSEOVER:
+ case SP_KNOT_DRAGGING:
+ case SP_KNOT_SELECTED:
+ this->_setCtrlState();
+ break;
+ case SP_KNOT_GRABBED:
+ break;
+ default:
+ g_assert_not_reached();
+ break;
+ }
+}
+
+// TODO: Look at removing this and setting ctrl parameters directly.
+void SPKnot::updateCtrl() {
+
+ if (ctrl) {
+ if (shape_set) {
+ ctrl->set_shape(shape);
+ }
+ ctrl->set_mode(mode);
+ if (size_set) {
+ ctrl->set_size(size);
+ }
+ ctrl->set_angle(angle);
+ ctrl->set_anchor(anchor);
+ ctrl->set_pixbuf(static_cast<GdkPixbuf *>(pixbuf));
+ }
+
+ _setCtrlState();
+}
+
+void SPKnot::_setCtrlState() {
+ int state = SP_KNOT_STATE_NORMAL;
+
+ if (this->flags & SP_KNOT_DRAGGING) {
+ state = SP_KNOT_STATE_DRAGGING;
+ } else if (this->flags & SP_KNOT_MOUSEOVER) {
+ state = SP_KNOT_STATE_MOUSEOVER;
+ } else if (this->flags & SP_KNOT_SELECTED) {
+ state = SP_KNOT_STATE_SELECTED;
+ }
+ if (ctrl) {
+ ctrl->set_fill(fill[state]);
+ ctrl->set_stroke(stroke[state]);
+ }
+}
+
+
+void SPKnot::setSize(guint i) {
+ size = i;
+ size_set = true;
+}
+
+void SPKnot::setShape(Inkscape::CanvasItemCtrlShape s) {
+ shape = s;
+ shape_set = true;
+}
+
+void SPKnot::setAnchor(guint i) {
+ anchor = (SPAnchorType) i;
+}
+
+void SPKnot::setMode(Inkscape::CanvasItemCtrlMode m) {
+ mode = m;
+}
+
+void SPKnot::setPixbuf(gpointer p) {
+ pixbuf = p;
+}
+
+void SPKnot::setAngle(double i) {
+ angle = i;
+}
+
+void SPKnot::setFill(guint32 normal, guint32 mouseover, guint32 dragging, guint32 selected) {
+ fill[SP_KNOT_STATE_NORMAL] = normal;
+ fill[SP_KNOT_STATE_MOUSEOVER] = mouseover;
+ fill[SP_KNOT_STATE_DRAGGING] = dragging;
+ fill[SP_KNOT_STATE_SELECTED] = selected;
+}
+
+void SPKnot::setStroke(guint32 normal, guint32 mouseover, guint32 dragging, guint32 selected) {
+ stroke[SP_KNOT_STATE_NORMAL] = normal;
+ stroke[SP_KNOT_STATE_MOUSEOVER] = mouseover;
+ stroke[SP_KNOT_STATE_DRAGGING] = dragging;
+ stroke[SP_KNOT_STATE_SELECTED] = selected;
+}
+
+void SPKnot::setImage(guchar* normal, guchar* mouseover, guchar* dragging, guchar* selected) {
+ image[SP_KNOT_STATE_NORMAL] = normal;
+ image[SP_KNOT_STATE_MOUSEOVER] = mouseover;
+ image[SP_KNOT_STATE_DRAGGING] = dragging;
+ image[SP_KNOT_STATE_SELECTED] = selected;
+}
+
+void SPKnot::setCursor(SPKnotStateType type, Glib::RefPtr<Gdk::Cursor> cursor)
+{
+ _cursors[type] = cursor;
+}
+
+/*
+ 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 :
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