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) 2000-2002 Lauris Kaplinski
12 * Copyright (C) 2000-2001 Ximian, Inc.
13 * Copyright (C) 2002 Mitsuru Oka
14 *
15 * Released under GNU GPL, read the file 'COPYING' for more information
16 */
18 #ifdef HAVE_CONFIG_H
19 # include <config.h>
20 #endif
21 #include <gdk/gdkkeysyms.h>
23 #include "macros.h"
24 #include <glibmm/i18n.h>
25 #include "display/sp-canvas.h"
26 #include "sp-ellipse.h"
27 #include "document.h"
28 #include "sp-namedview.h"
29 #include "selection.h"
30 #include "desktop-handles.h"
31 #include "snap.h"
32 #include "pixmaps/cursor-ellipse.xpm"
33 #include "pixmaps/cursor-ellipse.pixbuf"
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->cursor_pixbuf = gdk_pixbuf_new_from_inline(
100 -1,
101 cursor_ellipse_pixbuf,
102 FALSE,
103 NULL);
104 event_context->hot_x = 4;
105 event_context->hot_y = 4;
106 event_context->xp = 0;
107 event_context->yp = 0;
108 event_context->tolerance = 0;
109 event_context->within_tolerance = false;
110 event_context->item_to_select = NULL;
112 event_context->shape_repr = NULL;
113 event_context->shape_knot_holder = NULL;
115 arc_context->item = NULL;
117 new (&arc_context->sel_changed_connection) sigc::connection();
118 }
120 static void sp_arc_context_dispose(GObject *object)
121 {
122 SPEventContext *ec = SP_EVENT_CONTEXT(object);
123 SPArcContext *ac = SP_ARC_CONTEXT(object);
125 ec->enableGrDrag(false);
127 ac->sel_changed_connection.disconnect();
128 ac->sel_changed_connection.~connection();
130 if (ec->shape_knot_holder) {
131 sp_knot_holder_destroy(ec->shape_knot_holder);
132 ec->shape_knot_holder = NULL;
133 }
135 if (ec->shape_repr) { // remove old listener
136 sp_repr_remove_listener_by_data(ec->shape_repr, ec);
137 Inkscape::GC::release(ec->shape_repr);
138 ec->shape_repr = 0;
139 }
141 /* fixme: This is necessary because we do not grab */
142 if (ac->item) {
143 sp_arc_finish(ac);
144 }
146 delete ac->_message_context;
148 G_OBJECT_CLASS(parent_class)->dispose(object);
149 }
151 static Inkscape::XML::NodeEventVector ec_shape_repr_events = {
152 NULL, /* child_added */
153 NULL, /* child_removed */
154 ec_shape_event_attr_changed,
155 NULL, /* content_changed */
156 NULL /* order_changed */
157 };
159 /**
160 \brief Callback that processes the "changed" signal on the selection;
161 destroys old and creates new knotholder.
162 */
163 void sp_arc_context_selection_changed(Inkscape::Selection * selection, gpointer data)
164 {
165 SPArcContext *ac = SP_ARC_CONTEXT(data);
166 SPEventContext *ec = SP_EVENT_CONTEXT(ac);
168 if (ec->shape_knot_holder) { // desktroy knotholder
169 sp_knot_holder_destroy(ec->shape_knot_holder);
170 ec->shape_knot_holder = NULL;
171 }
173 if (ec->shape_repr) { // remove old listener
174 sp_repr_remove_listener_by_data(ec->shape_repr, ec);
175 Inkscape::GC::release(ec->shape_repr);
176 ec->shape_repr = 0;
177 }
179 SPItem *item = selection ? selection->singleItem() : NULL;
180 if (item) {
181 ec->shape_knot_holder = sp_item_knot_holder(item, ec->desktop);
182 Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item);
183 if (shape_repr) {
184 ec->shape_repr = shape_repr;
185 Inkscape::GC::anchor(shape_repr);
186 sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec);
187 }
188 }
189 }
191 static void sp_arc_context_setup(SPEventContext *ec)
192 {
193 SPArcContext *ac = SP_ARC_CONTEXT(ec);
194 Inkscape::Selection *selection = sp_desktop_selection(ec->desktop);
196 if (((SPEventContextClass *) parent_class)->setup) {
197 ((SPEventContextClass *) parent_class)->setup(ec);
198 }
200 SPItem *item = selection->singleItem();
202 if (item) {
203 ec->shape_knot_holder = sp_item_knot_holder(item, ec->desktop);
204 Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item);
205 if (shape_repr) {
206 ec->shape_repr = shape_repr;
207 Inkscape::GC::anchor(shape_repr);
208 sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec);
209 }
210 }
212 ac->sel_changed_connection.disconnect();
213 ac->sel_changed_connection = selection->connectChanged(
214 sigc::bind(sigc::ptr_fun(&sp_arc_context_selection_changed), (gpointer) ac)
215 );
217 if (prefs_get_int_attribute("tools.shapes", "selcue", 0) != 0) {
218 ec->enableSelectionCue();
219 }
221 if (prefs_get_int_attribute("tools.shapes", "gradientdrag", 0) != 0) {
222 ec->enableGrDrag();
223 }
225 ac->_message_context = new Inkscape::MessageContext(ec->desktop->messageStack());
226 }
228 static gint sp_arc_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
229 {
230 SPDesktop *desktop = event_context->desktop;
231 gint ret = FALSE;
233 switch (event->type) {
234 case GDK_BUTTON_PRESS:
235 if (event->button.button == 1) {
236 Inkscape::setup_for_drag_start(desktop, event_context, event);
237 ret = TRUE;
238 }
239 break;
240 // motion and release are always on root (why?)
241 default:
242 break;
243 }
245 if (((SPEventContextClass *) parent_class)->item_handler) {
246 ret = ((SPEventContextClass *) parent_class)->item_handler(event_context, item, event);
247 }
249 return ret;
250 }
252 static gint sp_arc_context_root_handler(SPEventContext *event_context, GdkEvent *event)
253 {
254 static bool dragging;
256 SPDesktop *desktop = event_context->desktop;
257 Inkscape::Selection *selection = sp_desktop_selection(desktop);
258 SPArcContext *ac = SP_ARC_CONTEXT(event_context);
260 event_context->tolerance = prefs_get_int_attribute_limited("options.dragtolerance", "value", 0, 0, 100);
262 gint ret = FALSE;
264 switch (event->type) {
265 case GDK_BUTTON_PRESS:
266 if (event->button.button == 1) {
268 dragging = true;
269 ac->center = Inkscape::setup_for_drag_start(desktop, event_context, event);
271 SnapManager const &m = desktop->namedview->snap_manager;
272 ac->center = m.freeSnap(Inkscape::Snapper::SNAP_POINT, ac->center, ac->item).getPoint();
273 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
274 GDK_KEY_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
275 GDK_POINTER_MOTION_MASK | GDK_BUTTON_PRESS_MASK,
276 NULL, event->button.time);
277 ret = TRUE;
278 }
279 break;
280 case GDK_MOTION_NOTIFY:
281 if (dragging && event->motion.state && GDK_BUTTON1_MASK) {
283 if ( event_context->within_tolerance
284 && ( abs( (gint) event->motion.x - event_context->xp ) < event_context->tolerance )
285 && ( abs( (gint) event->motion.y - event_context->yp ) < event_context->tolerance ) ) {
286 break; // do not drag if we're within tolerance from origin
287 }
288 // Once the user has moved farther than tolerance from the original location
289 // (indicating they intend to draw, not click), then always process the
290 // motion notify coordinates as given (no snapping back to origin)
291 event_context->within_tolerance = false;
293 NR::Point const motion_w(event->motion.x, event->motion.y);
294 NR::Point const motion_dt(desktop->w2d(motion_w));
295 sp_arc_drag(ac, motion_dt, event->motion.state);
296 ret = TRUE;
297 }
298 break;
299 case GDK_BUTTON_RELEASE:
300 event_context->xp = event_context->yp = 0;
301 if (event->button.button == 1) {
302 dragging = false;
303 if (!event_context->within_tolerance) {
304 // we've been dragging, finish the arc
305 sp_arc_finish(ac);
306 } else if (event_context->item_to_select) {
307 // no dragging, select clicked item if any
308 if (event->button.state & GDK_SHIFT_MASK) {
309 selection->toggle(event_context->item_to_select);
310 } else {
311 selection->set(event_context->item_to_select);
312 }
313 } else {
314 // click in an empty space
315 selection->clear();
316 }
317 event_context->xp = 0;
318 event_context->yp = 0;
319 event_context->item_to_select = NULL;
320 ret = TRUE;
321 }
322 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), event->button.time);
323 break;
324 case GDK_KEY_PRESS:
325 switch (get_group0_keyval (&event->key)) {
326 case GDK_Alt_L:
327 case GDK_Alt_R:
328 case GDK_Control_L:
329 case GDK_Control_R:
330 case GDK_Shift_L:
331 case GDK_Shift_R:
332 case GDK_Meta_L: // Meta is when you press Shift+Alt (at least on my machine)
333 case GDK_Meta_R:
334 sp_event_show_modifier_tip(event_context->defaultMessageContext(), event,
335 _("<b>Ctrl</b>: make circle or integer-ratio ellipse, snap arc/segment angle"),
336 _("<b>Shift</b>: draw around the starting point"),
337 NULL);
338 break;
339 case GDK_Up:
340 case GDK_Down:
341 case GDK_KP_Up:
342 case GDK_KP_Down:
343 // prevent the zoom field from activation
344 if (!MOD__CTRL_ONLY)
345 ret = TRUE;
346 break;
347 case GDK_x:
348 case GDK_X:
349 if (MOD__ALT_ONLY) {
350 desktop->setToolboxFocusTo ("altx-arc");
351 ret = TRUE;
352 }
353 break;
354 case GDK_Escape:
355 sp_desktop_selection(desktop)->clear();
356 //TODO: make dragging escapable by Esc
357 default:
358 break;
359 }
360 break;
361 case GDK_KEY_RELEASE:
362 switch (event->key.keyval) {
363 case GDK_Alt_L:
364 case GDK_Alt_R:
365 case GDK_Control_L:
366 case GDK_Control_R:
367 case GDK_Shift_L:
368 case GDK_Shift_R:
369 case GDK_Meta_L: // Meta is when you press Shift+Alt
370 case GDK_Meta_R:
371 event_context->defaultMessageContext()->clear();
372 break;
373 default:
374 break;
375 }
376 break;
377 default:
378 break;
379 }
381 if (!ret) {
382 if (((SPEventContextClass *) parent_class)->root_handler) {
383 ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
384 }
385 }
387 return ret;
388 }
390 static void sp_arc_drag(SPArcContext *ac, NR::Point pt, guint state)
391 {
392 SPDesktop *desktop = SP_EVENT_CONTEXT(ac)->desktop;
394 if (!ac->item) {
396 if (Inkscape::have_viable_layer(desktop, ac->_message_context) == false) {
397 return;
398 }
400 /* Create object */
401 Inkscape::XML::Node *repr = sp_repr_new("svg:path");
402 repr->setAttribute("sodipodi:type", "arc");
404 /* Set style */
405 sp_desktop_apply_style_tool(desktop, repr, "tools.shapes.arc", false);
407 ac->item = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));
408 Inkscape::GC::release(repr);
409 ac->item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer());
410 ac->item->updateRepr();
412 sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5);
413 }
415 NR::Rect const r = Inkscape::snap_rectangular_box(desktop, ac->item, pt, ac->center, state);
417 sp_arc_position_set(SP_ARC(ac->item),
418 r.midpoint()[NR::X], r.midpoint()[NR::Y],
419 r.dimensions()[NR::X] / 2, r.dimensions()[NR::Y] / 2);
421 GString *xs = SP_PX_TO_METRIC_STRING(r.dimensions()[NR::X], desktop->namedview->getDefaultMetric());
422 GString *ys = SP_PX_TO_METRIC_STRING(r.dimensions()[NR::Y], desktop->namedview->getDefaultMetric());
423 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);
424 g_string_free(xs, FALSE);
425 g_string_free(ys, FALSE);
426 }
428 static void sp_arc_finish(SPArcContext *ac)
429 {
430 ac->_message_context->clear();
432 if (ac->item != NULL) {
433 SPDesktop *desktop = SP_EVENT_CONTEXT(ac)->desktop;
435 SP_OBJECT(ac->item)->updateRepr();
437 sp_canvas_end_forced_full_redraws(desktop->canvas);
439 sp_desktop_selection(desktop)->set(ac->item);
440 sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_ARC,
441 _("Create ellipse"));
443 ac->item = NULL;
444 }
445 }
448 /*
449 Local Variables:
450 mode:c++
451 c-file-style:"stroustrup"
452 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
453 indent-tabs-mode:nil
454 fill-column:99
455 End:
456 */
457 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :