1 #define __SP_ARC_CONTEXT_C__
3 /** \file Ellipse drawing context. */
5 /*
6 * Authors:
7 * Mitsuru Oka
8 * Lauris Kaplinski <lauris@kaplinski.com>
9 * bulia byak <buliabyak@users.sf.net>
10 *
11 * Copyright (C) 2006 Johan Engelen <johan@shouraizou.nl>
12 * Copyright (C) 2002 Mitsuru Oka
13 * Copyright (C) 2000-2002 Lauris Kaplinski
14 * Copyright (C) 2000-2001 Ximian, Inc.
15 *
16 * Released under GNU GPL, read the file 'COPYING' for more information
17 */
19 #ifdef HAVE_CONFIG_H
20 # include <config.h>
21 #endif
22 #include <gdk/gdkkeysyms.h>
24 #include "macros.h"
25 #include <glibmm/i18n.h>
26 #include "display/sp-canvas.h"
27 #include "sp-ellipse.h"
28 #include "document.h"
29 #include "sp-namedview.h"
30 #include "selection.h"
31 #include "desktop-handles.h"
32 #include "snap.h"
33 #include "pixmaps/cursor-ellipse.xpm"
34 #include "sp-metrics.h"
35 #include "xml/repr.h"
36 #include "xml/node-event-vector.h"
37 #include "object-edit.h"
38 #include "prefs-utils.h"
39 #include "message-context.h"
40 #include "desktop.h"
41 #include "desktop-style.h"
42 #include "context-fns.h"
43 #include "verbs.h"
45 #include "arc-context.h"
47 static void sp_arc_context_class_init(SPArcContextClass *klass);
48 static void sp_arc_context_init(SPArcContext *arc_context);
49 static void sp_arc_context_dispose(GObject *object);
51 static void sp_arc_context_setup(SPEventContext *ec);
52 static gint sp_arc_context_root_handler(SPEventContext *event_context, GdkEvent *event);
53 static gint sp_arc_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
55 static void sp_arc_drag(SPArcContext *ec, NR::Point pt, guint state);
56 static void sp_arc_finish(SPArcContext *ec);
58 static SPEventContextClass *parent_class;
60 GtkType sp_arc_context_get_type()
61 {
62 static GType type = 0;
63 if (!type) {
64 GTypeInfo info = {
65 sizeof(SPArcContextClass),
66 NULL, NULL,
67 (GClassInitFunc) sp_arc_context_class_init,
68 NULL, NULL,
69 sizeof(SPArcContext),
70 4,
71 (GInstanceInitFunc) sp_arc_context_init,
72 NULL, /* value_table */
73 };
74 type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPArcContext", &info, (GTypeFlags) 0);
75 }
76 return type;
77 }
79 static void sp_arc_context_class_init(SPArcContextClass *klass)
80 {
82 GObjectClass *object_class = (GObjectClass *) klass;
83 SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
85 parent_class = (SPEventContextClass*) g_type_class_peek_parent(klass);
87 object_class->dispose = sp_arc_context_dispose;
89 event_context_class->setup = sp_arc_context_setup;
90 event_context_class->root_handler = sp_arc_context_root_handler;
91 event_context_class->item_handler = sp_arc_context_item_handler;
92 }
94 static void sp_arc_context_init(SPArcContext *arc_context)
95 {
96 SPEventContext *event_context = SP_EVENT_CONTEXT(arc_context);
98 event_context->cursor_shape = cursor_ellipse_xpm;
99 event_context->hot_x = 4;
100 event_context->hot_y = 4;
101 event_context->xp = 0;
102 event_context->yp = 0;
103 event_context->tolerance = 0;
104 event_context->within_tolerance = false;
105 event_context->item_to_select = NULL;
107 event_context->shape_repr = NULL;
108 event_context->shape_knot_holder = NULL;
110 arc_context->item = NULL;
112 new (&arc_context->sel_changed_connection) sigc::connection();
113 }
115 static void sp_arc_context_dispose(GObject *object)
116 {
117 SPEventContext *ec = SP_EVENT_CONTEXT(object);
118 SPArcContext *ac = SP_ARC_CONTEXT(object);
120 ec->enableGrDrag(false);
122 ac->sel_changed_connection.disconnect();
123 ac->sel_changed_connection.~connection();
125 if (ec->shape_knot_holder) {
126 sp_knot_holder_destroy(ec->shape_knot_holder);
127 ec->shape_knot_holder = NULL;
128 }
130 if (ec->shape_repr) { // remove old listener
131 sp_repr_remove_listener_by_data(ec->shape_repr, ec);
132 Inkscape::GC::release(ec->shape_repr);
133 ec->shape_repr = 0;
134 }
136 /* fixme: This is necessary because we do not grab */
137 if (ac->item) {
138 sp_arc_finish(ac);
139 }
141 delete ac->_message_context;
143 G_OBJECT_CLASS(parent_class)->dispose(object);
144 }
146 static Inkscape::XML::NodeEventVector ec_shape_repr_events = {
147 NULL, /* child_added */
148 NULL, /* child_removed */
149 ec_shape_event_attr_changed,
150 NULL, /* content_changed */
151 NULL /* order_changed */
152 };
154 /**
155 \brief Callback that processes the "changed" signal on the selection;
156 destroys old and creates new knotholder.
157 */
158 void sp_arc_context_selection_changed(Inkscape::Selection * selection, gpointer data)
159 {
160 SPArcContext *ac = SP_ARC_CONTEXT(data);
161 SPEventContext *ec = SP_EVENT_CONTEXT(ac);
163 if (ec->shape_knot_holder) { // desktroy knotholder
164 sp_knot_holder_destroy(ec->shape_knot_holder);
165 ec->shape_knot_holder = NULL;
166 }
168 if (ec->shape_repr) { // remove old listener
169 sp_repr_remove_listener_by_data(ec->shape_repr, ec);
170 Inkscape::GC::release(ec->shape_repr);
171 ec->shape_repr = 0;
172 }
174 SPItem *item = selection ? selection->singleItem() : NULL;
175 if (item) {
176 ec->shape_knot_holder = sp_item_knot_holder(item, ec->desktop);
177 Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item);
178 if (shape_repr) {
179 ec->shape_repr = shape_repr;
180 Inkscape::GC::anchor(shape_repr);
181 sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec);
182 }
183 }
184 }
186 static void sp_arc_context_setup(SPEventContext *ec)
187 {
188 SPArcContext *ac = SP_ARC_CONTEXT(ec);
189 Inkscape::Selection *selection = sp_desktop_selection(ec->desktop);
191 if (((SPEventContextClass *) parent_class)->setup) {
192 ((SPEventContextClass *) parent_class)->setup(ec);
193 }
195 SPItem *item = selection->singleItem();
197 if (item) {
198 ec->shape_knot_holder = sp_item_knot_holder(item, ec->desktop);
199 Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item);
200 if (shape_repr) {
201 ec->shape_repr = shape_repr;
202 Inkscape::GC::anchor(shape_repr);
203 sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec);
204 }
205 }
207 ac->sel_changed_connection.disconnect();
208 ac->sel_changed_connection = selection->connectChanged(
209 sigc::bind(sigc::ptr_fun(&sp_arc_context_selection_changed), (gpointer) ac)
210 );
212 if (prefs_get_int_attribute("tools.shapes", "selcue", 0) != 0) {
213 ec->enableSelectionCue();
214 }
216 if (prefs_get_int_attribute("tools.shapes", "gradientdrag", 0) != 0) {
217 ec->enableGrDrag();
218 }
220 ac->_message_context = new Inkscape::MessageContext(ec->desktop->messageStack());
221 }
223 static gint sp_arc_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
224 {
225 SPDesktop *desktop = event_context->desktop;
226 gint ret = FALSE;
228 switch (event->type) {
229 case GDK_BUTTON_PRESS:
230 if (event->button.button == 1) {
231 Inkscape::setup_for_drag_start(desktop, event_context, event);
232 ret = TRUE;
233 }
234 break;
235 // motion and release are always on root (why?)
236 default:
237 break;
238 }
240 if (((SPEventContextClass *) parent_class)->item_handler) {
241 ret = ((SPEventContextClass *) parent_class)->item_handler(event_context, item, event);
242 }
244 return ret;
245 }
247 static gint sp_arc_context_root_handler(SPEventContext *event_context, GdkEvent *event)
248 {
249 static bool dragging;
251 SPDesktop *desktop = event_context->desktop;
252 Inkscape::Selection *selection = sp_desktop_selection(desktop);
253 SPArcContext *ac = SP_ARC_CONTEXT(event_context);
255 event_context->tolerance = prefs_get_int_attribute_limited("options.dragtolerance", "value", 0, 0, 100);
257 gint ret = FALSE;
259 switch (event->type) {
260 case GDK_BUTTON_PRESS:
261 if (event->button.button == 1) {
263 dragging = true;
264 ac->center = Inkscape::setup_for_drag_start(desktop, event_context, event);
266 SnapManager const &m = desktop->namedview->snap_manager;
267 ac->center = m.freeSnap(Inkscape::Snapper::SNAP_POINT, ac->center, ac->item).getPoint();
268 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
269 GDK_KEY_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
270 GDK_POINTER_MOTION_MASK | GDK_BUTTON_PRESS_MASK,
271 NULL, event->button.time);
272 ret = TRUE;
273 }
274 break;
275 case GDK_MOTION_NOTIFY:
276 if (dragging && event->motion.state && GDK_BUTTON1_MASK) {
278 if ( event_context->within_tolerance
279 && ( abs( (gint) event->motion.x - event_context->xp ) < event_context->tolerance )
280 && ( abs( (gint) event->motion.y - event_context->yp ) < event_context->tolerance ) ) {
281 break; // do not drag if we're within tolerance from origin
282 }
283 // Once the user has moved farther than tolerance from the original location
284 // (indicating they intend to draw, not click), then always process the
285 // motion notify coordinates as given (no snapping back to origin)
286 event_context->within_tolerance = false;
288 NR::Point const motion_w(event->motion.x, event->motion.y);
289 NR::Point const motion_dt(desktop->w2d(motion_w));
290 sp_arc_drag(ac, motion_dt, event->motion.state);
291 ret = TRUE;
292 }
293 break;
294 case GDK_BUTTON_RELEASE:
295 event_context->xp = event_context->yp = 0;
296 if (event->button.button == 1) {
297 dragging = false;
298 if (!event_context->within_tolerance) {
299 // we've been dragging, finish the arc
300 sp_arc_finish(ac);
301 } else if (event_context->item_to_select) {
302 // no dragging, select clicked item if any
303 if (event->button.state & GDK_SHIFT_MASK) {
304 selection->toggle(event_context->item_to_select);
305 } else {
306 selection->set(event_context->item_to_select);
307 }
308 } else {
309 // click in an empty space
310 selection->clear();
311 }
312 event_context->xp = 0;
313 event_context->yp = 0;
314 event_context->item_to_select = NULL;
315 ret = TRUE;
316 }
317 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), event->button.time);
318 break;
319 case GDK_KEY_PRESS:
320 switch (get_group0_keyval (&event->key)) {
321 case GDK_Alt_L:
322 case GDK_Alt_R:
323 case GDK_Control_L:
324 case GDK_Control_R:
325 case GDK_Shift_L:
326 case GDK_Shift_R:
327 case GDK_Meta_L: // Meta is when you press Shift+Alt (at least on my machine)
328 case GDK_Meta_R:
329 if (!dragging) {
330 sp_event_show_modifier_tip(event_context->defaultMessageContext(), event,
331 _("<b>Ctrl</b>: make circle or integer-ratio ellipse, snap arc/segment angle"),
332 _("<b>Shift</b>: draw around the starting point"),
333 NULL);
334 }
335 break;
336 case GDK_Up:
337 case GDK_Down:
338 case GDK_KP_Up:
339 case GDK_KP_Down:
340 // prevent the zoom field from activation
341 if (!MOD__CTRL_ONLY)
342 ret = TRUE;
343 break;
344 case GDK_x:
345 case GDK_X:
346 if (MOD__ALT_ONLY) {
347 desktop->setToolboxFocusTo ("altx-arc");
348 ret = TRUE;
349 }
350 break;
351 case GDK_Escape:
352 sp_desktop_selection(desktop)->clear();
353 //TODO: make dragging escapable by Esc
354 default:
355 break;
356 }
357 break;
358 case GDK_KEY_RELEASE:
359 switch (event->key.keyval) {
360 case GDK_Alt_L:
361 case GDK_Alt_R:
362 case GDK_Control_L:
363 case GDK_Control_R:
364 case GDK_Shift_L:
365 case GDK_Shift_R:
366 case GDK_Meta_L: // Meta is when you press Shift+Alt
367 case GDK_Meta_R:
368 event_context->defaultMessageContext()->clear();
369 break;
370 default:
371 break;
372 }
373 break;
374 default:
375 break;
376 }
378 if (!ret) {
379 if (((SPEventContextClass *) parent_class)->root_handler) {
380 ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
381 }
382 }
384 return ret;
385 }
387 static void sp_arc_drag(SPArcContext *ac, NR::Point pt, guint state)
388 {
389 SPDesktop *desktop = SP_EVENT_CONTEXT(ac)->desktop;
391 if (!ac->item) {
393 if (Inkscape::have_viable_layer(desktop, ac->_message_context) == false) {
394 return;
395 }
397 /* Create object */
398 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(desktop->doc());
399 Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
400 repr->setAttribute("sodipodi:type", "arc");
402 /* Set style */
403 sp_desktop_apply_style_tool(desktop, repr, "tools.shapes.arc", false);
405 ac->item = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));
406 Inkscape::GC::release(repr);
407 ac->item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer());
408 ac->item->updateRepr();
410 sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5);
411 }
413 NR::Rect const r = Inkscape::snap_rectangular_box(desktop, ac->item, pt, ac->center, state);
415 sp_arc_position_set(SP_ARC(ac->item),
416 r.midpoint()[NR::X], r.midpoint()[NR::Y],
417 r.dimensions()[NR::X] / 2, r.dimensions()[NR::Y] / 2);
419 GString *xs = SP_PX_TO_METRIC_STRING(r.dimensions()[NR::X], desktop->namedview->getDefaultMetric());
420 GString *ys = SP_PX_TO_METRIC_STRING(r.dimensions()[NR::Y], desktop->namedview->getDefaultMetric());
421 ac->_message_context->setF(Inkscape::NORMAL_MESSAGE, _("<b>Ellipse</b>: %s × %s; with <b>Ctrl</b> to make circle or integer-ratio ellipse; with <b>Shift</b> to draw around the starting point"), xs->str, ys->str);
422 g_string_free(xs, FALSE);
423 g_string_free(ys, FALSE);
424 }
426 static void sp_arc_finish(SPArcContext *ac)
427 {
428 ac->_message_context->clear();
430 if (ac->item != NULL) {
431 SPDesktop *desktop = SP_EVENT_CONTEXT(ac)->desktop;
433 SP_OBJECT(ac->item)->updateRepr();
435 sp_canvas_end_forced_full_redraws(desktop->canvas);
437 sp_desktop_selection(desktop)->set(ac->item);
438 sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_ARC,
439 _("Create ellipse"));
441 ac->item = NULL;
442 }
443 }
446 /*
447 Local Variables:
448 mode:c++
449 c-file-style:"stroustrup"
450 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
451 indent-tabs-mode:nil
452 fill-column:99
453 End:
454 */
455 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :