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[inkscape.git] / src / gradient-context.cpp
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 "pixmaps/cursor-gradient.pixbuf"
30 #include "gradient-context.h"
31 #include <glibmm/i18n.h>
32 #include "prefs-utils.h"
33 #include "gradient-drag.h"
34 #include "gradient-chemistry.h"
35 #include "xml/repr.h"
36 #include "sp-item.h"
38 static void sp_gradient_context_class_init(SPGradientContextClass *klass);
39 static void sp_gradient_context_init(SPGradientContext *gr_context);
40 static void sp_gradient_context_dispose(GObject *object);
42 static void sp_gradient_context_setup(SPEventContext *ec);
44 static gint sp_gradient_context_root_handler(SPEventContext *event_context, GdkEvent *event);
46 static void sp_gradient_drag(SPGradientContext &rc, NR::Point const pt, guint state, guint32 etime);
48 static SPEventContextClass *parent_class;
51 GtkType sp_gradient_context_get_type()
52 {
53     static GType type = 0;
54     if (!type) {
55         GTypeInfo info = {
56             sizeof(SPGradientContextClass),
57             NULL, NULL,
58             (GClassInitFunc) sp_gradient_context_class_init,
59             NULL, NULL,
60             sizeof(SPGradientContext),
61             4,
62             (GInstanceInitFunc) sp_gradient_context_init,
63             NULL,    /* value_table */
64         };
65         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPGradientContext", &info, (GTypeFlags) 0);
66     }
67     return type;
68 }
70 static void sp_gradient_context_class_init(SPGradientContextClass *klass)
71 {
72     GObjectClass *object_class = (GObjectClass *) klass;
73     SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
75     parent_class = (SPEventContextClass *) g_type_class_peek_parent(klass);
77     object_class->dispose = sp_gradient_context_dispose;
79     event_context_class->setup = sp_gradient_context_setup;
80     event_context_class->root_handler  = sp_gradient_context_root_handler;
81 }
83 static void sp_gradient_context_init(SPGradientContext *gr_context)
84 {
85     SPEventContext *event_context = SP_EVENT_CONTEXT(gr_context);
87     event_context->cursor_shape = cursor_gradient_xpm;
88     event_context->cursor_pixbuf = gdk_pixbuf_new_from_inline(
89             -1,
90             cursor_gradient_pixbuf,
91             FALSE,
92             NULL);  
93     event_context->hot_x = 4;
94     event_context->hot_y = 4;
95     event_context->xp = 0;
96     event_context->yp = 0;
97     event_context->tolerance = 0;
98     event_context->within_tolerance = false;
99     event_context->item_to_select = NULL;
102 static void sp_gradient_context_dispose(GObject *object)
104     SPGradientContext *rc = SP_GRADIENT_CONTEXT(object);
105     SPEventContext *ec = SP_EVENT_CONTEXT(object);
107     ec->enableGrDrag(false);
109     if (rc->_message_context) {
110         delete rc->_message_context;
111     }
113     G_OBJECT_CLASS(parent_class)->dispose(object);
116 static void sp_gradient_context_setup(SPEventContext *ec)
118     SPGradientContext *rc = SP_GRADIENT_CONTEXT(ec);
120     if (((SPEventContextClass *) parent_class)->setup) {
121         ((SPEventContextClass *) parent_class)->setup(ec);
122     }
124     if (prefs_get_int_attribute("tools.gradient", "selcue", 1) != 0) {
125         ec->enableSelectionCue();
126     }
128     ec->enableGrDrag();
130     rc->_message_context = new Inkscape::MessageContext(sp_desktop_message_stack(ec->desktop));
133 static gint sp_gradient_context_root_handler(SPEventContext *event_context, GdkEvent *event)
135     static bool dragging;
137     SPDesktop *desktop = event_context->desktop;
138     Inkscape::Selection *selection = sp_desktop_selection (desktop);
140     SPGradientContext *rc = SP_GRADIENT_CONTEXT(event_context);
142     event_context->tolerance = prefs_get_int_attribute_limited("options.dragtolerance", "value", 0, 0, 100);
143     double const nudge = prefs_get_double_attribute_limited("options.nudgedistance", "value", 2, 0, 1000); // in px
145     GrDrag *drag = event_context->_grdrag;
146     g_assert (drag);
148     gint ret = FALSE;
149     switch (event->type) {
150     case GDK_2BUTTON_PRESS:
151         if ( event->button.button == 1 ) {
152             for (GSList const* i = selection->itemList(); i != NULL; i = i->next) {
153                 SPItem *item = SP_ITEM(i->data);
154                 SPGradientType new_type = (SPGradientType) prefs_get_int_attribute ("tools.gradient", "newgradient", SP_GRADIENT_TYPE_LINEAR);
155                 guint new_fill = prefs_get_int_attribute ("tools.gradient", "newfillorstroke", 1);
157                 SPGradient *vector = sp_gradient_vector_for_object(sp_desktop_document(desktop), desktop,                                                                                   SP_OBJECT (item), new_fill);
159                 SPGradient *priv = sp_item_set_gradient(item, vector, new_type, new_fill);
160                 sp_gradient_reset_to_userspace(priv, item);
161             }
163             sp_document_done (sp_desktop_document (desktop), SP_VERB_CONTEXT_GRADIENT,
164                               /* TODO: annotate */ "gradient-context.cpp:164");
166             ret = TRUE;
167         }
168         break;
169     case GDK_BUTTON_PRESS:
170         if ( event->button.button == 1 ) {
171             NR::Point const button_w(event->button.x, event->button.y);
173             // save drag origin
174             event_context->xp = (gint) button_w[NR::X];
175             event_context->yp = (gint) button_w[NR::Y];
176             event_context->within_tolerance = true;
178             // remember clicked item, disregarding groups, honoring Alt; do nothing with Crtl to
179             // enable Ctrl+doubleclick of exactly the selected item(s)
180             if (!(event->button.state & GDK_CONTROL_MASK))
181                 event_context->item_to_select = sp_event_context_find_item (desktop, button_w, event->button.state & GDK_MOD1_MASK, TRUE);
183             dragging = true;
184             /* Position center */
185             NR::Point const button_dt = desktop->w2d(button_w);
186             /* Snap center to nearest magnetic point */
188             rc->origin = button_dt;
190             ret = TRUE;
191         }
192         break;
193     case GDK_MOTION_NOTIFY:
194         if ( dragging
195              && ( event->motion.state & GDK_BUTTON1_MASK ) )
196         {
197             if ( event_context->within_tolerance
198                  && ( abs( (gint) event->motion.x - event_context->xp ) < event_context->tolerance )
199                  && ( abs( (gint) event->motion.y - event_context->yp ) < event_context->tolerance ) ) {
200                 break; // do not drag if we're within tolerance from origin
201             }
202             // Once the user has moved farther than tolerance from the original location
203             // (indicating they intend to draw, not click), then always process the
204             // motion notify coordinates as given (no snapping back to origin)
205             event_context->within_tolerance = false;
207             NR::Point const motion_w(event->motion.x,
208                                      event->motion.y);
209             NR::Point const motion_dt = event_context->desktop->w2d(motion_w);
211             sp_gradient_drag(*rc, motion_dt, event->motion.state, event->motion.time);
213             ret = TRUE;
214         }
215         break;
216     case GDK_BUTTON_RELEASE:
217         event_context->xp = event_context->yp = 0;
218         if ( event->button.button == 1 ) {
219             dragging = false;
221             // unless clicked with Ctrl (to enable Ctrl+doubleclick)
222             if (event->button.state & GDK_CONTROL_MASK) {
223                 ret = TRUE;
224                 break;
225             }
227             if (!event_context->within_tolerance) {
228                 // we've been dragging, do nothing (grdrag handles that)
229             } else if (event_context->item_to_select) {
230                 // no dragging, select clicked item if any
231                 if (event->button.state & GDK_SHIFT_MASK) {
232                     selection->toggle(event_context->item_to_select);
233                 } else {
234                     selection->set(event_context->item_to_select);
235                 }
236             } else {
237                 // click in an empty space; do the same as Esc
238                 if (drag->selected) {
239                     drag->setSelected (NULL);
240                 } else {
241                     selection->clear();
242                 }
243             }
245             event_context->item_to_select = NULL;
246             ret = TRUE;
247         }
248         break;
249     case GDK_KEY_PRESS:
250         switch (get_group0_keyval (&event->key)) {
251         case GDK_Alt_L:
252         case GDK_Alt_R:
253         case GDK_Control_L:
254         case GDK_Control_R:
255         case GDK_Shift_L:
256         case GDK_Shift_R:
257         case GDK_Meta_L:  // Meta is when you press Shift+Alt (at least on my machine)
258         case GDK_Meta_R:
259             sp_event_show_modifier_tip (event_context->defaultMessageContext(), event,
260                                         _("<b>Ctrl</b>: snap gradient angle"),
261                                         _("<b>Shift</b>: draw gradient around the starting point"),
262                                         NULL);
263             break;
265         case GDK_x:
266         case GDK_X:
267             if (MOD__ALT_ONLY) {
268                 desktop->setToolboxFocusTo ("altx-grad");
269                 ret = TRUE;
270             }
271             break;
273         case GDK_Escape:
274             if (drag->selected) {
275                 drag->setSelected (NULL);
276             } else {
277                 selection->clear();
278             }
279             ret = TRUE;
280             //TODO: make dragging escapable by Esc
281             break;
283         case GDK_Tab: // Tab - cycle selection forward
284             if (!(MOD__CTRL_ONLY || (MOD__CTRL && MOD__SHIFT))) {
285                 drag->select_next();
286                 ret = TRUE;
287             }
288             break;
289         case GDK_ISO_Left_Tab:  // Shift Tab - cycle selection backward
290             if (!(MOD__CTRL_ONLY || (MOD__CTRL && MOD__SHIFT))) {
291                 drag->select_prev();
292                 ret = TRUE;
293             }
294             break;
296         case GDK_Left: // move handle left
297         case GDK_KP_Left:
298         case GDK_KP_4:
299             if (!MOD__CTRL) { // not ctrl
300                 if (MOD__ALT) { // alt
301                     if (MOD__SHIFT) drag->selected_move_screen(-10, 0); // shift
302                     else drag->selected_move_screen(-1, 0); // no shift
303                 }
304                 else { // no alt
305                     if (MOD__SHIFT) drag->selected_move(-10*nudge, 0); // shift
306                     else drag->selected_move(-nudge, 0); // no shift
307                 }
308                 ret = TRUE;
309             }
310             break;
311         case GDK_Up: // move handle up
312         case GDK_KP_Up:
313         case GDK_KP_8:
314             if (!MOD__CTRL) { // not ctrl
315                 if (MOD__ALT) { // alt
316                     if (MOD__SHIFT) drag->selected_move_screen(0, 10); // shift
317                     else drag->selected_move_screen(0, 1); // no shift
318                 }
319                 else { // no alt
320                     if (MOD__SHIFT) drag->selected_move(0, 10*nudge); // shift
321                     else drag->selected_move(0, nudge); // no shift
322                 }
323                 ret = TRUE;
324             }
325             break;
326         case GDK_Right: // move handle right
327         case GDK_KP_Right:
328         case GDK_KP_6:
329             if (!MOD__CTRL) { // not ctrl
330                 if (MOD__ALT) { // alt
331                     if (MOD__SHIFT) drag->selected_move_screen(10, 0); // shift
332                     else drag->selected_move_screen(1, 0); // no shift
333                 }
334                 else { // no alt
335                     if (MOD__SHIFT) drag->selected_move(10*nudge, 0); // shift
336                     else drag->selected_move(nudge, 0); // no shift
337                 }
338                 ret = TRUE;
339             }
340             break;
341         case GDK_Down: // move handle down
342         case GDK_KP_Down:
343         case GDK_KP_2:
344             if (!MOD__CTRL) { // not ctrl
345                 if (MOD__ALT) { // alt
346                     if (MOD__SHIFT) drag->selected_move_screen(0, -10); // shift
347                     else drag->selected_move_screen(0, -1); // no shift
348                 }
349                 else { // no alt
350                     if (MOD__SHIFT) drag->selected_move(0, -10*nudge); // shift
351                     else drag->selected_move(0, -nudge); // no shift
352                 }
353                 ret = TRUE;
354             }
355             break;
356         case GDK_r:
357         case GDK_R:
358             if (MOD__SHIFT_ONLY) {
359                 // First try selected dragger
360                 if (drag && drag->selected) {
361                     drag->selected_reverse_vector();
362                 } else { // If no drag or no dragger selected, act on selection (both fill and stroke gradients)
363                     for (GSList const* i = selection->itemList(); i != NULL; i = i->next) {
364                         sp_item_gradient_reverse_vector (SP_ITEM(i->data), true);
365                         sp_item_gradient_reverse_vector (SP_ITEM(i->data), false);
366                     }
367                 }
368                 // we did an undoable action
369                 sp_document_done (sp_desktop_document (desktop), SP_VERB_CONTEXT_GRADIENT,
370                                   /* TODO: annotate */ "gradient-context.cpp:370");
371                 ret = TRUE;
372             }
373             break;
374         default:
375             break;
376         }
377         break;
378     case GDK_KEY_RELEASE:
379         switch (get_group0_keyval (&event->key)) {
380         case GDK_Alt_L:
381         case GDK_Alt_R:
382         case GDK_Control_L:
383         case GDK_Control_R:
384         case GDK_Shift_L:
385         case GDK_Shift_R:
386         case GDK_Meta_L:  // Meta is when you press Shift+Alt
387         case GDK_Meta_R:
388             event_context->defaultMessageContext()->clear();
389             break;
390         default:
391             break;
392         }
393         break;
394     default:
395         break;
396     }
398     if (!ret) {
399         if (((SPEventContextClass *) parent_class)->root_handler) {
400             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
401         }
402     }
404     return ret;
407 static void sp_gradient_drag(SPGradientContext &rc, NR::Point const pt, guint state, guint32 etime)
409     SPDesktop *desktop = SP_EVENT_CONTEXT(&rc)->desktop;
410     Inkscape::Selection *selection = sp_desktop_selection(desktop);
411     SPDocument *document = sp_desktop_document(desktop);
412     SPEventContext *ec = SP_EVENT_CONTEXT(&rc);
414     if (!selection->isEmpty()) {
415         int type = prefs_get_int_attribute ("tools.gradient", "newgradient", 1);
416         int fill_or_stroke = prefs_get_int_attribute ("tools.gradient", "newfillorstroke", 1);
418         SPGradient *vector;
419         if (ec->item_to_select) {
420             vector = sp_gradient_vector_for_object(document, desktop, ec->item_to_select, fill_or_stroke);
421         } else {
422             vector = sp_gradient_vector_for_object(document, desktop, SP_ITEM(selection->itemList()->data), fill_or_stroke);
423         }
425         // HACK: reset fill-opacity - that 0.75 is annoying; BUT remove this when we have an opacity slider for all tabs
426         SPCSSAttr *css = sp_repr_css_attr_new();
427         sp_repr_css_set_property(css, "fill-opacity", "1.0");
429         for (GSList const *i = selection->itemList(); i != NULL; i = i->next) {
431             //FIXME: see above
432             sp_repr_css_change_recursive(SP_OBJECT_REPR(i->data), css, "style");
434             sp_item_set_gradient(SP_ITEM(i->data), vector, (SPGradientType) type, fill_or_stroke);
436             if (type == SP_GRADIENT_TYPE_LINEAR) {
437                 sp_item_gradient_set_coords (SP_ITEM(i->data), POINT_LG_P1, rc.origin, fill_or_stroke, true, false);
438                 sp_item_gradient_set_coords (SP_ITEM(i->data), POINT_LG_P2, pt, fill_or_stroke, true, false);
439             } else if (type == SP_GRADIENT_TYPE_RADIAL) {
440                 sp_item_gradient_set_coords (SP_ITEM(i->data), POINT_RG_CENTER, rc.origin, fill_or_stroke, true, false);
441                 sp_item_gradient_set_coords (SP_ITEM(i->data), POINT_RG_R1, pt, fill_or_stroke, true, false);
442             }
443             SP_OBJECT (i->data)->requestModified(SP_OBJECT_MODIFIED_FLAG);
444         }
445         if (ec->_grdrag) {
446             ec->_grdrag->updateDraggers();
447             // prevent regenerating draggers by selection modified signal, which sometimes
448             // comes too late and thus destroys the knot which we will now grab:
449             ec->_grdrag->local_change = true;
450             // give the grab out-of-bounds values of xp/yp because we're already dragging
451             // and therefore are already out of tolerance
452             ec->_grdrag->grabKnot (SP_ITEM(selection->itemList()->data),
453                                    type == SP_GRADIENT_TYPE_LINEAR? POINT_LG_P2 : POINT_RG_R1,
454                                    fill_or_stroke, 99999, 99999, etime);
455         }
456         // We did an undoable action, but sp_document_done will be called by the knot when released
458         // status text; we do not track coords because this branch is run once, not all the time
459         // during drag
460         int n_objects = g_slist_length((GSList *) selection->itemList());
461         rc._message_context->setF(Inkscape::NORMAL_MESSAGE,
462                                   ngettext("<b>Gradient</b> for %d object; with <b>Ctrl</b> to snap angle",
463                                            "<b>Gradient</b> for %d objects; with <b>Ctrl</b> to snap angle", n_objects),
464                                   n_objects);
465     } else {
466         sp_desktop_message_stack(desktop)->flash(Inkscape::WARNING_MESSAGE, _("Select <b>objects</b> on which to create gradient."));
467     }
471 /*
472   Local Variables:
473   mode:c++
474   c-file-style:"stroustrup"
475   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
476   indent-tabs-mode:nil
477   fill-column:99
478   End:
479 */
480 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :