1 #define __SP_GRADIENT_CONTEXT_C__
3 /*
4 * Gradient drawing and editing tool
5 *
6 * Authors:
7 * bulia byak <buliabyak@users.sf.net>
8 *
9 * Copyright (C) 2005 Authors
10 *
11 * Released under GNU GPL, read the file 'COPYING' for more information
12 */
14 #ifdef HAVE_CONFIG_H
15 # include "config.h"
16 #endif
19 #include <gdk/gdkkeysyms.h>
21 #include "macros.h"
22 #include "document.h"
23 #include "selection.h"
24 #include "desktop.h"
25 #include "desktop-handles.h"
26 #include "message-context.h"
27 #include "message-stack.h"
28 #include "pixmaps/cursor-gradient.xpm"
29 #include "gradient-context.h"
30 #include <glibmm/i18n.h>
31 #include "prefs-utils.h"
32 #include "gradient-drag.h"
33 #include "gradient-chemistry.h"
34 #include "xml/repr.h"
35 #include "sp-item.h"
37 static void sp_gradient_context_class_init(SPGradientContextClass *klass);
38 static void sp_gradient_context_init(SPGradientContext *gr_context);
39 static void sp_gradient_context_dispose(GObject *object);
41 static void sp_gradient_context_setup(SPEventContext *ec);
43 static gint sp_gradient_context_root_handler(SPEventContext *event_context, GdkEvent *event);
45 static void sp_gradient_drag(SPGradientContext &rc, NR::Point const pt, guint state, guint32 etime);
47 static SPEventContextClass *parent_class;
50 GtkType sp_gradient_context_get_type()
51 {
52 static GType type = 0;
53 if (!type) {
54 GTypeInfo info = {
55 sizeof(SPGradientContextClass),
56 NULL, NULL,
57 (GClassInitFunc) sp_gradient_context_class_init,
58 NULL, NULL,
59 sizeof(SPGradientContext),
60 4,
61 (GInstanceInitFunc) sp_gradient_context_init,
62 NULL, /* value_table */
63 };
64 type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPGradientContext", &info, (GTypeFlags) 0);
65 }
66 return type;
67 }
69 static void sp_gradient_context_class_init(SPGradientContextClass *klass)
70 {
71 GObjectClass *object_class = (GObjectClass *) klass;
72 SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
74 parent_class = (SPEventContextClass *) g_type_class_peek_parent(klass);
76 object_class->dispose = sp_gradient_context_dispose;
78 event_context_class->setup = sp_gradient_context_setup;
79 event_context_class->root_handler = sp_gradient_context_root_handler;
80 }
82 static void sp_gradient_context_init(SPGradientContext *gr_context)
83 {
84 SPEventContext *event_context = SP_EVENT_CONTEXT(gr_context);
86 event_context->cursor_shape = cursor_gradient_xpm;
87 event_context->hot_x = 4;
88 event_context->hot_y = 4;
89 event_context->xp = 0;
90 event_context->yp = 0;
91 event_context->tolerance = 0;
92 event_context->within_tolerance = false;
93 event_context->item_to_select = NULL;
94 }
96 static void sp_gradient_context_dispose(GObject *object)
97 {
98 SPGradientContext *rc = SP_GRADIENT_CONTEXT(object);
99 SPEventContext *ec = SP_EVENT_CONTEXT(object);
101 ec->enableGrDrag(false);
103 if (rc->_message_context) {
104 delete rc->_message_context;
105 }
107 G_OBJECT_CLASS(parent_class)->dispose(object);
108 }
110 static void sp_gradient_context_setup(SPEventContext *ec)
111 {
112 SPGradientContext *rc = SP_GRADIENT_CONTEXT(ec);
114 if (((SPEventContextClass *) parent_class)->setup) {
115 ((SPEventContextClass *) parent_class)->setup(ec);
116 }
118 if (prefs_get_int_attribute("tools.gradient", "selcue", 1) != 0) {
119 ec->enableSelectionCue();
120 }
122 ec->enableGrDrag();
124 rc->_message_context = new Inkscape::MessageContext(sp_desktop_message_stack(ec->desktop));
125 }
127 static gint sp_gradient_context_root_handler(SPEventContext *event_context, GdkEvent *event)
128 {
129 static bool dragging;
131 SPDesktop *desktop = event_context->desktop;
132 Inkscape::Selection *selection = sp_desktop_selection (desktop);
134 SPGradientContext *rc = SP_GRADIENT_CONTEXT(event_context);
136 event_context->tolerance = prefs_get_int_attribute_limited("options.dragtolerance", "value", 0, 0, 100);
137 double const nudge = prefs_get_double_attribute_limited("options.nudgedistance", "value", 2, 0, 1000); // in px
139 GrDrag *drag = event_context->_grdrag;
140 g_assert (drag);
142 gint ret = FALSE;
143 switch (event->type) {
144 case GDK_2BUTTON_PRESS:
145 if ( event->button.button == 1 ) {
146 for (GSList const* i = selection->itemList(); i != NULL; i = i->next) {
147 SPItem *item = SP_ITEM(i->data);
148 SPGradientType new_type = (SPGradientType) prefs_get_int_attribute ("tools.gradient", "newgradient", SP_GRADIENT_TYPE_LINEAR);
149 guint new_fill = prefs_get_int_attribute ("tools.gradient", "newfillorstroke", 1);
151 SPGradient *vector = sp_gradient_vector_for_object(sp_desktop_document(desktop), desktop, SP_OBJECT (item), new_fill);
153 SPGradient *priv = sp_item_set_gradient(item, vector, new_type, new_fill);
154 sp_gradient_reset_to_userspace(priv, item);
155 }
157 sp_document_done (sp_desktop_document (desktop), SP_VERB_CONTEXT_GRADIENT,
158 _("Create default gradient"));
160 ret = TRUE;
161 }
162 break;
163 case GDK_BUTTON_PRESS:
164 if ( event->button.button == 1 ) {
165 NR::Point const button_w(event->button.x, event->button.y);
167 // save drag origin
168 event_context->xp = (gint) button_w[NR::X];
169 event_context->yp = (gint) button_w[NR::Y];
170 event_context->within_tolerance = true;
172 // remember clicked item, disregarding groups, honoring Alt; do nothing with Crtl to
173 // enable Ctrl+doubleclick of exactly the selected item(s)
174 if (!(event->button.state & GDK_CONTROL_MASK))
175 event_context->item_to_select = sp_event_context_find_item (desktop, button_w, event->button.state & GDK_MOD1_MASK, TRUE);
177 dragging = true;
178 /* Position center */
179 NR::Point const button_dt = desktop->w2d(button_w);
180 /* Snap center to nearest magnetic point */
182 rc->origin = button_dt;
184 ret = TRUE;
185 }
186 break;
187 case GDK_MOTION_NOTIFY:
188 if ( dragging
189 && ( event->motion.state & GDK_BUTTON1_MASK ) )
190 {
191 if ( event_context->within_tolerance
192 && ( abs( (gint) event->motion.x - event_context->xp ) < event_context->tolerance )
193 && ( abs( (gint) event->motion.y - event_context->yp ) < event_context->tolerance ) ) {
194 break; // do not drag if we're within tolerance from origin
195 }
196 // Once the user has moved farther than tolerance from the original location
197 // (indicating they intend to draw, not click), then always process the
198 // motion notify coordinates as given (no snapping back to origin)
199 event_context->within_tolerance = false;
201 NR::Point const motion_w(event->motion.x,
202 event->motion.y);
203 NR::Point const motion_dt = event_context->desktop->w2d(motion_w);
205 sp_gradient_drag(*rc, motion_dt, event->motion.state, event->motion.time);
207 ret = TRUE;
208 }
209 break;
210 case GDK_BUTTON_RELEASE:
211 event_context->xp = event_context->yp = 0;
212 if ( event->button.button == 1 ) {
213 dragging = false;
215 // unless clicked with Ctrl (to enable Ctrl+doubleclick)
216 if (event->button.state & GDK_CONTROL_MASK) {
217 ret = TRUE;
218 break;
219 }
221 if (!event_context->within_tolerance) {
222 // we've been dragging, do nothing (grdrag handles that)
223 } else if (event_context->item_to_select) {
224 // no dragging, select clicked item if any
225 if (event->button.state & GDK_SHIFT_MASK) {
226 selection->toggle(event_context->item_to_select);
227 } else {
228 selection->set(event_context->item_to_select);
229 }
230 } else {
231 // click in an empty space; do the same as Esc
232 if (drag->selected) {
233 drag->setSelected (NULL);
234 } else {
235 selection->clear();
236 }
237 }
239 event_context->item_to_select = NULL;
240 ret = TRUE;
241 }
242 break;
243 case GDK_KEY_PRESS:
244 switch (get_group0_keyval (&event->key)) {
245 case GDK_Alt_L:
246 case GDK_Alt_R:
247 case GDK_Control_L:
248 case GDK_Control_R:
249 case GDK_Shift_L:
250 case GDK_Shift_R:
251 case GDK_Meta_L: // Meta is when you press Shift+Alt (at least on my machine)
252 case GDK_Meta_R:
253 sp_event_show_modifier_tip (event_context->defaultMessageContext(), event,
254 _("<b>Ctrl</b>: snap gradient angle"),
255 _("<b>Shift</b>: draw gradient around the starting point"),
256 NULL);
257 break;
259 case GDK_x:
260 case GDK_X:
261 if (MOD__ALT_ONLY) {
262 desktop->setToolboxFocusTo ("altx-grad");
263 ret = TRUE;
264 }
265 break;
267 case GDK_Escape:
268 if (drag->selected) {
269 drag->setSelected (NULL);
270 } else {
271 selection->clear();
272 }
273 ret = TRUE;
274 //TODO: make dragging escapable by Esc
275 break;
277 case GDK_Tab: // Tab - cycle selection forward
278 if (!(MOD__CTRL_ONLY || (MOD__CTRL && MOD__SHIFT))) {
279 drag->select_next();
280 ret = TRUE;
281 }
282 break;
283 case GDK_ISO_Left_Tab: // Shift Tab - cycle selection backward
284 if (!(MOD__CTRL_ONLY || (MOD__CTRL && MOD__SHIFT))) {
285 drag->select_prev();
286 ret = TRUE;
287 }
288 break;
290 case GDK_Left: // move handle left
291 case GDK_KP_Left:
292 case GDK_KP_4:
293 if (!MOD__CTRL) { // not ctrl
294 if (MOD__ALT) { // alt
295 if (MOD__SHIFT) drag->selected_move_screen(-10, 0); // shift
296 else drag->selected_move_screen(-1, 0); // no shift
297 }
298 else { // no alt
299 if (MOD__SHIFT) drag->selected_move(-10*nudge, 0); // shift
300 else drag->selected_move(-nudge, 0); // no shift
301 }
302 ret = TRUE;
303 }
304 break;
305 case GDK_Up: // move handle up
306 case GDK_KP_Up:
307 case GDK_KP_8:
308 if (!MOD__CTRL) { // not ctrl
309 if (MOD__ALT) { // alt
310 if (MOD__SHIFT) drag->selected_move_screen(0, 10); // shift
311 else drag->selected_move_screen(0, 1); // no shift
312 }
313 else { // no alt
314 if (MOD__SHIFT) drag->selected_move(0, 10*nudge); // shift
315 else drag->selected_move(0, nudge); // no shift
316 }
317 ret = TRUE;
318 }
319 break;
320 case GDK_Right: // move handle right
321 case GDK_KP_Right:
322 case GDK_KP_6:
323 if (!MOD__CTRL) { // not ctrl
324 if (MOD__ALT) { // alt
325 if (MOD__SHIFT) drag->selected_move_screen(10, 0); // shift
326 else drag->selected_move_screen(1, 0); // no shift
327 }
328 else { // no alt
329 if (MOD__SHIFT) drag->selected_move(10*nudge, 0); // shift
330 else drag->selected_move(nudge, 0); // no shift
331 }
332 ret = TRUE;
333 }
334 break;
335 case GDK_Down: // move handle down
336 case GDK_KP_Down:
337 case GDK_KP_2:
338 if (!MOD__CTRL) { // not ctrl
339 if (MOD__ALT) { // alt
340 if (MOD__SHIFT) drag->selected_move_screen(0, -10); // shift
341 else drag->selected_move_screen(0, -1); // no shift
342 }
343 else { // no alt
344 if (MOD__SHIFT) drag->selected_move(0, -10*nudge); // shift
345 else drag->selected_move(0, -nudge); // no shift
346 }
347 ret = TRUE;
348 }
349 break;
350 case GDK_r:
351 case GDK_R:
352 if (MOD__SHIFT_ONLY) {
353 // First try selected dragger
354 if (drag && drag->selected) {
355 drag->selected_reverse_vector();
356 } else { // If no drag or no dragger selected, act on selection (both fill and stroke gradients)
357 for (GSList const* i = selection->itemList(); i != NULL; i = i->next) {
358 sp_item_gradient_reverse_vector (SP_ITEM(i->data), true);
359 sp_item_gradient_reverse_vector (SP_ITEM(i->data), false);
360 }
361 }
362 // we did an undoable action
363 sp_document_done (sp_desktop_document (desktop), SP_VERB_CONTEXT_GRADIENT,
364 _("Invert gradient"));
365 ret = TRUE;
366 }
367 break;
368 default:
369 break;
370 }
371 break;
372 case GDK_KEY_RELEASE:
373 switch (get_group0_keyval (&event->key)) {
374 case GDK_Alt_L:
375 case GDK_Alt_R:
376 case GDK_Control_L:
377 case GDK_Control_R:
378 case GDK_Shift_L:
379 case GDK_Shift_R:
380 case GDK_Meta_L: // Meta is when you press Shift+Alt
381 case GDK_Meta_R:
382 event_context->defaultMessageContext()->clear();
383 break;
384 default:
385 break;
386 }
387 break;
388 default:
389 break;
390 }
392 if (!ret) {
393 if (((SPEventContextClass *) parent_class)->root_handler) {
394 ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
395 }
396 }
398 return ret;
399 }
401 static void sp_gradient_drag(SPGradientContext &rc, NR::Point const pt, guint state, guint32 etime)
402 {
403 SPDesktop *desktop = SP_EVENT_CONTEXT(&rc)->desktop;
404 Inkscape::Selection *selection = sp_desktop_selection(desktop);
405 SPDocument *document = sp_desktop_document(desktop);
406 SPEventContext *ec = SP_EVENT_CONTEXT(&rc);
408 if (!selection->isEmpty()) {
409 int type = prefs_get_int_attribute ("tools.gradient", "newgradient", 1);
410 int fill_or_stroke = prefs_get_int_attribute ("tools.gradient", "newfillorstroke", 1);
412 SPGradient *vector;
413 if (ec->item_to_select) {
414 vector = sp_gradient_vector_for_object(document, desktop, ec->item_to_select, fill_or_stroke);
415 } else {
416 vector = sp_gradient_vector_for_object(document, desktop, SP_ITEM(selection->itemList()->data), fill_or_stroke);
417 }
419 // HACK: reset fill-opacity - that 0.75 is annoying; BUT remove this when we have an opacity slider for all tabs
420 SPCSSAttr *css = sp_repr_css_attr_new();
421 sp_repr_css_set_property(css, "fill-opacity", "1.0");
423 for (GSList const *i = selection->itemList(); i != NULL; i = i->next) {
425 //FIXME: see above
426 sp_repr_css_change_recursive(SP_OBJECT_REPR(i->data), css, "style");
428 sp_item_set_gradient(SP_ITEM(i->data), vector, (SPGradientType) type, fill_or_stroke);
430 if (type == SP_GRADIENT_TYPE_LINEAR) {
431 sp_item_gradient_set_coords (SP_ITEM(i->data), POINT_LG_P1, rc.origin, fill_or_stroke, true, false);
432 sp_item_gradient_set_coords (SP_ITEM(i->data), POINT_LG_P2, pt, fill_or_stroke, true, false);
433 } else if (type == SP_GRADIENT_TYPE_RADIAL) {
434 sp_item_gradient_set_coords (SP_ITEM(i->data), POINT_RG_CENTER, rc.origin, fill_or_stroke, true, false);
435 sp_item_gradient_set_coords (SP_ITEM(i->data), POINT_RG_R1, pt, fill_or_stroke, true, false);
436 }
437 SP_OBJECT (i->data)->requestModified(SP_OBJECT_MODIFIED_FLAG);
438 }
439 if (ec->_grdrag) {
440 ec->_grdrag->updateDraggers();
441 // prevent regenerating draggers by selection modified signal, which sometimes
442 // comes too late and thus destroys the knot which we will now grab:
443 ec->_grdrag->local_change = true;
444 // give the grab out-of-bounds values of xp/yp because we're already dragging
445 // and therefore are already out of tolerance
446 ec->_grdrag->grabKnot (SP_ITEM(selection->itemList()->data),
447 type == SP_GRADIENT_TYPE_LINEAR? POINT_LG_P2 : POINT_RG_R1,
448 fill_or_stroke, 99999, 99999, etime);
449 }
450 // We did an undoable action, but sp_document_done will be called by the knot when released
452 // status text; we do not track coords because this branch is run once, not all the time
453 // during drag
454 int n_objects = g_slist_length((GSList *) selection->itemList());
455 rc._message_context->setF(Inkscape::NORMAL_MESSAGE,
456 ngettext("<b>Gradient</b> for %d object; with <b>Ctrl</b> to snap angle",
457 "<b>Gradient</b> for %d objects; with <b>Ctrl</b> to snap angle", n_objects),
458 n_objects);
459 } else {
460 sp_desktop_message_stack(desktop)->flash(Inkscape::WARNING_MESSAGE, _("Select <b>objects</b> on which to create gradient."));
461 }
462 }
465 /*
466 Local Variables:
467 mode:c++
468 c-file-style:"stroustrup"
469 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
470 indent-tabs-mode:nil
471 fill-column:99
472 End:
473 */
474 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :