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_DT_MSGSTACK(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_DT_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_DT_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_DT_DOCUMENT (desktop));
159 ret = TRUE;
160 }
161 break;
162 case GDK_BUTTON_PRESS:
163 if ( event->button.button == 1 ) {
164 NR::Point const button_w(event->button.x, event->button.y);
166 // save drag origin
167 event_context->xp = (gint) button_w[NR::X];
168 event_context->yp = (gint) button_w[NR::Y];
169 event_context->within_tolerance = true;
171 // remember clicked item, disregarding groups, honoring Alt; do nothing with Crtl to
172 // enable Ctrl+doubleclick of exactly the selected item(s)
173 if (!(event->button.state & GDK_CONTROL_MASK))
174 event_context->item_to_select = sp_event_context_find_item (desktop, button_w, event->button.state & GDK_MOD1_MASK, TRUE);
176 dragging = true;
177 /* Position center */
178 NR::Point const button_dt = desktop->w2d(button_w);
179 /* Snap center to nearest magnetic point */
181 rc->origin = button_dt;
183 ret = TRUE;
184 }
185 break;
186 case GDK_MOTION_NOTIFY:
187 if ( dragging
188 && ( event->motion.state & GDK_BUTTON1_MASK ) )
189 {
190 if ( event_context->within_tolerance
191 && ( abs( (gint) event->motion.x - event_context->xp ) < event_context->tolerance )
192 && ( abs( (gint) event->motion.y - event_context->yp ) < event_context->tolerance ) ) {
193 break; // do not drag if we're within tolerance from origin
194 }
195 // Once the user has moved farther than tolerance from the original location
196 // (indicating they intend to draw, not click), then always process the
197 // motion notify coordinates as given (no snapping back to origin)
198 event_context->within_tolerance = false;
200 NR::Point const motion_w(event->motion.x,
201 event->motion.y);
202 NR::Point const motion_dt = event_context->desktop->w2d(motion_w);
204 sp_gradient_drag(*rc, motion_dt, event->motion.state, event->motion.time);
206 ret = TRUE;
207 }
208 break;
209 case GDK_BUTTON_RELEASE:
210 event_context->xp = event_context->yp = 0;
211 if ( event->button.button == 1 ) {
212 dragging = false;
214 // unless clicked with Ctrl (to enable Ctrl+doubleclick)
215 if (event->button.state & GDK_CONTROL_MASK) {
216 ret = TRUE;
217 break;
218 }
220 if (!event_context->within_tolerance) {
221 // we've been dragging, do nothing (grdrag handles that)
222 } else if (event_context->item_to_select) {
223 // no dragging, select clicked item if any
224 if (event->button.state & GDK_SHIFT_MASK) {
225 selection->toggle(event_context->item_to_select);
226 } else {
227 selection->set(event_context->item_to_select);
228 }
229 } else {
230 // click in an empty space; do the same as Esc
231 if (drag->selected) {
232 drag->setSelected (NULL);
233 } else {
234 selection->clear();
235 }
236 }
238 event_context->item_to_select = NULL;
239 ret = TRUE;
240 }
241 break;
242 case GDK_KEY_PRESS:
243 switch (get_group0_keyval (&event->key)) {
244 case GDK_Alt_L:
245 case GDK_Alt_R:
246 case GDK_Control_L:
247 case GDK_Control_R:
248 case GDK_Shift_L:
249 case GDK_Shift_R:
250 case GDK_Meta_L: // Meta is when you press Shift+Alt (at least on my machine)
251 case GDK_Meta_R:
252 sp_event_show_modifier_tip (event_context->defaultMessageContext(), event,
253 _("<b>Ctrl</b>: snap gradient angle"),
254 _("<b>Shift</b>: draw gradient around the starting point"),
255 NULL);
256 break;
258 case GDK_x:
259 case GDK_X:
260 if (MOD__ALT_ONLY) {
261 desktop->setToolboxFocusTo ("altx-grad");
262 ret = TRUE;
263 }
264 break;
266 case GDK_Escape:
267 if (drag->selected) {
268 drag->setSelected (NULL);
269 } else {
270 selection->clear();
271 }
272 ret = TRUE;
273 //TODO: make dragging escapable by Esc
274 break;
276 case GDK_Tab: // Tab - cycle selection forward
277 if (!(MOD__CTRL_ONLY || (MOD__CTRL && MOD__SHIFT))) {
278 drag->select_next();
279 ret = TRUE;
280 }
281 break;
282 case GDK_ISO_Left_Tab: // Shift Tab - cycle selection backward
283 if (!(MOD__CTRL_ONLY || (MOD__CTRL && MOD__SHIFT))) {
284 drag->select_prev();
285 ret = TRUE;
286 }
287 break;
289 case GDK_Left: // move handle left
290 case GDK_KP_Left:
291 case GDK_KP_4:
292 if (!MOD__CTRL) { // not ctrl
293 if (MOD__ALT) { // alt
294 if (MOD__SHIFT) drag->selected_move_screen(-10, 0); // shift
295 else drag->selected_move_screen(-1, 0); // no shift
296 }
297 else { // no alt
298 if (MOD__SHIFT) drag->selected_move(-10*nudge, 0); // shift
299 else drag->selected_move(-nudge, 0); // no shift
300 }
301 ret = TRUE;
302 }
303 break;
304 case GDK_Up: // move handle up
305 case GDK_KP_Up:
306 case GDK_KP_8:
307 if (!MOD__CTRL) { // not ctrl
308 if (MOD__ALT) { // alt
309 if (MOD__SHIFT) drag->selected_move_screen(0, 10); // shift
310 else drag->selected_move_screen(0, 1); // no shift
311 }
312 else { // no alt
313 if (MOD__SHIFT) drag->selected_move(0, 10*nudge); // shift
314 else drag->selected_move(0, nudge); // no shift
315 }
316 ret = TRUE;
317 }
318 break;
319 case GDK_Right: // move handle right
320 case GDK_KP_Right:
321 case GDK_KP_6:
322 if (!MOD__CTRL) { // not ctrl
323 if (MOD__ALT) { // alt
324 if (MOD__SHIFT) drag->selected_move_screen(10, 0); // shift
325 else drag->selected_move_screen(1, 0); // no shift
326 }
327 else { // no alt
328 if (MOD__SHIFT) drag->selected_move(10*nudge, 0); // shift
329 else drag->selected_move(nudge, 0); // no shift
330 }
331 ret = TRUE;
332 }
333 break;
334 case GDK_Down: // move handle down
335 case GDK_KP_Down:
336 case GDK_KP_2:
337 if (!MOD__CTRL) { // not ctrl
338 if (MOD__ALT) { // alt
339 if (MOD__SHIFT) drag->selected_move_screen(0, -10); // shift
340 else drag->selected_move_screen(0, -1); // no shift
341 }
342 else { // no alt
343 if (MOD__SHIFT) drag->selected_move(0, -10*nudge); // shift
344 else drag->selected_move(0, -nudge); // no shift
345 }
346 ret = TRUE;
347 }
348 break;
349 case GDK_r:
350 case GDK_R:
351 if (MOD__SHIFT_ONLY) {
352 // First try selected dragger
353 if (drag && drag->selected) {
354 drag->selected_reverse_vector();
355 } else { // If no drag or no dragger selected, act on selection (both fill and stroke gradients)
356 for (GSList const* i = selection->itemList(); i != NULL; i = i->next) {
357 sp_item_gradient_reverse_vector (SP_ITEM(i->data), true);
358 sp_item_gradient_reverse_vector (SP_ITEM(i->data), false);
359 }
360 }
361 // we did an undoable action
362 sp_document_done (SP_DT_DOCUMENT (desktop));
363 ret = TRUE;
364 }
365 break;
366 default:
367 break;
368 }
369 break;
370 case GDK_KEY_RELEASE:
371 switch (get_group0_keyval (&event->key)) {
372 case GDK_Alt_L:
373 case GDK_Alt_R:
374 case GDK_Control_L:
375 case GDK_Control_R:
376 case GDK_Shift_L:
377 case GDK_Shift_R:
378 case GDK_Meta_L: // Meta is when you press Shift+Alt
379 case GDK_Meta_R:
380 event_context->defaultMessageContext()->clear();
381 break;
382 default:
383 break;
384 }
385 break;
386 default:
387 break;
388 }
390 if (!ret) {
391 if (((SPEventContextClass *) parent_class)->root_handler) {
392 ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
393 }
394 }
396 return ret;
397 }
399 static void sp_gradient_drag(SPGradientContext &rc, NR::Point const pt, guint state, guint32 etime)
400 {
401 SPDesktop *desktop = SP_EVENT_CONTEXT(&rc)->desktop;
402 Inkscape::Selection *selection = SP_DT_SELECTION(desktop);
403 SPDocument *document = SP_DT_DOCUMENT(desktop);
404 SPEventContext *ec = SP_EVENT_CONTEXT(&rc);
406 if (!selection->isEmpty()) {
407 int type = prefs_get_int_attribute ("tools.gradient", "newgradient", 1);
408 int fill_or_stroke = prefs_get_int_attribute ("tools.gradient", "newfillorstroke", 1);
410 SPGradient *vector;
411 if (ec->item_to_select) {
412 vector = sp_gradient_vector_for_object(document, desktop, ec->item_to_select, fill_or_stroke);
413 } else {
414 vector = sp_gradient_vector_for_object(document, desktop, SP_ITEM(selection->itemList()->data), fill_or_stroke);
415 }
417 // HACK: reset fill-opacity - that 0.75 is annoying; BUT remove this when we have an opacity slider for all tabs
418 SPCSSAttr *css = sp_repr_css_attr_new();
419 sp_repr_css_set_property(css, "fill-opacity", "1.0");
421 for (GSList const *i = selection->itemList(); i != NULL; i = i->next) {
423 //FIXME: see above
424 sp_repr_css_change_recursive(SP_OBJECT_REPR(i->data), css, "style");
426 sp_item_set_gradient(SP_ITEM(i->data), vector, (SPGradientType) type, fill_or_stroke);
428 if (type == SP_GRADIENT_TYPE_LINEAR) {
429 sp_item_gradient_set_coords (SP_ITEM(i->data), POINT_LG_P1, rc.origin, fill_or_stroke, true, false);
430 sp_item_gradient_set_coords (SP_ITEM(i->data), POINT_LG_P2, pt, fill_or_stroke, true, false);
431 } else if (type == SP_GRADIENT_TYPE_RADIAL) {
432 sp_item_gradient_set_coords (SP_ITEM(i->data), POINT_RG_CENTER, rc.origin, fill_or_stroke, true, false);
433 sp_item_gradient_set_coords (SP_ITEM(i->data), POINT_RG_R1, pt, fill_or_stroke, true, false);
434 }
435 SP_OBJECT (i->data)->requestModified(SP_OBJECT_MODIFIED_FLAG);
436 }
437 if (ec->_grdrag) {
438 ec->_grdrag->updateDraggers();
439 // prevent regenerating draggers by selection modified signal, which sometimes
440 // comes too late and thus destroys the knot which we will now grab:
441 ec->_grdrag->local_change = true;
442 // give the grab out-of-bounds values of xp/yp because we're already dragging
443 // and therefore are already out of tolerance
444 ec->_grdrag->grabKnot (SP_ITEM(selection->itemList()->data),
445 type == SP_GRADIENT_TYPE_LINEAR? POINT_LG_P2 : POINT_RG_R1,
446 fill_or_stroke, 99999, 99999, etime);
447 }
448 // We did an undoable action, but sp_document_done will be called by the knot when released
450 // status text; we do not track coords because this branch is run once, not all the time
451 // during drag
452 rc._message_context->setF(Inkscape::NORMAL_MESSAGE, _("<b>Gradient</b> for %d objects; with <b>Ctrl</b> to snap angle"), g_slist_length((GSList *) selection->itemList()));
453 } else {
454 SP_DT_MSGSTACK(desktop)->flash(Inkscape::WARNING_MESSAGE, _("Select <b>objects</b> on which to create gradient."));
455 }
456 }
459 /*
460 Local Variables:
461 mode:c++
462 c-file-style:"stroustrup"
463 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
464 indent-tabs-mode:nil
465 fill-column:99
466 End:
467 */
468 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :