1 /*
2 * Handy zooming tool
3 *
4 * Authors:
5 * Lauris Kaplinski <lauris@kaplinski.com>
6 * Frank Felfe <innerspace@iname.com>
7 * bulia byak <buliabyak@users.sf.net>
8 *
9 * Copyright (C) 1999-2002 Authors
10 *
11 * Released under GNU GPL, read the file 'COPYING' for more information
12 */
15 #include <gdk/gdkkeysyms.h>
17 #include "macros.h"
18 #include "rubberband.h"
19 #include "display/sp-canvas-item.h"
20 #include "display/sp-canvas-util.h"
21 #include "desktop.h"
22 #include "pixmaps/cursor-zoom.xpm"
23 #include "pixmaps/cursor-zoom-out.xpm"
24 #include "preferences.h"
26 #include "zoom-context.h"
28 static void sp_zoom_context_class_init(SPZoomContextClass *klass);
29 static void sp_zoom_context_init(SPZoomContext *zoom_context);
30 static void sp_zoom_context_setup(SPEventContext *ec);
31 static void sp_zoom_context_finish (SPEventContext *ec);
33 static gint sp_zoom_context_root_handler(SPEventContext *event_context, GdkEvent *event);
34 static gint sp_zoom_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
36 static SPEventContextClass *parent_class;
38 static gint xp = 0, yp = 0; // where drag started
39 static gint tolerance = 0;
40 static bool within_tolerance = false;
41 static bool escaped;
43 GType sp_zoom_context_get_type(void)
44 {
45 static GType type = 0;
47 if (!type) {
48 GTypeInfo info = {
49 sizeof(SPZoomContextClass),
50 NULL, NULL,
51 (GClassInitFunc) sp_zoom_context_class_init,
52 NULL, NULL,
53 sizeof(SPZoomContext),
54 4,
55 (GInstanceInitFunc) sp_zoom_context_init,
56 NULL, /* value_table */
57 };
58 type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPZoomContext", &info, (GTypeFlags) 0);
59 }
61 return type;
62 }
64 static void sp_zoom_context_class_init(SPZoomContextClass *klass)
65 {
66 SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
68 parent_class = (SPEventContextClass*) g_type_class_peek_parent(klass);
70 event_context_class->setup = sp_zoom_context_setup;
71 event_context_class->finish = sp_zoom_context_finish;
73 event_context_class->root_handler = sp_zoom_context_root_handler;
74 event_context_class->item_handler = sp_zoom_context_item_handler;
75 }
77 static void sp_zoom_context_init (SPZoomContext *zoom_context)
78 {
79 SPEventContext *event_context = SP_EVENT_CONTEXT(zoom_context);
81 event_context->cursor_shape = cursor_zoom_xpm;
82 event_context->hot_x = 6;
83 event_context->hot_y = 6;
84 }
86 static void
87 sp_zoom_context_finish (SPEventContext *ec)
88 {
89 SPZoomContext *zc = SP_ZOOM_CONTEXT(ec);
91 ec->enableGrDrag(false);
93 if (zc->grabbed) {
94 sp_canvas_item_ungrab(zc->grabbed, GDK_CURRENT_TIME);
95 zc->grabbed = NULL;
96 }
97 }
99 static void sp_zoom_context_setup(SPEventContext *ec)
100 {
101 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
102 if (prefs->getBool("/tools/zoom/selcue")) {
103 ec->enableSelectionCue();
104 }
105 if (prefs->getBool("/tools/zoom/gradientdrag")) {
106 ec->enableGrDrag();
107 }
109 if (((SPEventContextClass *) parent_class)->setup) {
110 ((SPEventContextClass *) parent_class)->setup(ec);
111 }
112 }
114 static gint sp_zoom_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
115 {
116 gint ret = FALSE;
118 if (((SPEventContextClass *) parent_class)->item_handler) {
119 ret = ((SPEventContextClass *) parent_class)->item_handler (event_context, item, event);
120 }
122 return ret;
123 }
125 static gint sp_zoom_context_root_handler(SPEventContext *event_context, GdkEvent *event)
126 {
127 SPDesktop *desktop = event_context->desktop;
128 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
130 SPZoomContext *zc = SP_ZOOM_CONTEXT(event_context);
131 tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
132 double const zoom_inc = prefs->getDoubleLimited("/options/zoomincrement/value", M_SQRT2, 1.01, 10);
134 gint ret = FALSE;
136 switch (event->type) {
137 case GDK_BUTTON_PRESS:
138 {
139 Geom::Point const button_w(event->button.x, event->button.y);
140 Geom::Point const button_dt(desktop->w2d(button_w));
141 if (event->button.button == 1 && !event_context->space_panning) {
142 // save drag origin
143 xp = (gint) event->button.x;
144 yp = (gint) event->button.y;
145 within_tolerance = true;
147 Inkscape::Rubberband::get(desktop)->start(desktop, button_dt);
149 escaped = false;
151 ret = TRUE;
152 } else if (event->button.button == 3) {
153 double const zoom_rel( (event->button.state & GDK_SHIFT_MASK)
154 ? zoom_inc
155 : 1 / zoom_inc );
156 desktop->zoom_relative_keep_point(button_dt, zoom_rel);
157 ret = TRUE;
158 }
160 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
161 GDK_KEY_PRESS_MASK | GDK_KEY_RELEASE_MASK | GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON_PRESS_MASK,
162 NULL, event->button.time);
163 zc->grabbed = SP_CANVAS_ITEM(desktop->acetate);
165 break;
166 }
168 case GDK_MOTION_NOTIFY:
169 if (event->motion.state & GDK_BUTTON1_MASK && !event_context->space_panning) {
170 ret = TRUE;
172 if ( within_tolerance
173 && ( abs( (gint) event->motion.x - xp ) < tolerance )
174 && ( abs( (gint) event->motion.y - yp ) < tolerance ) ) {
175 break; // do not drag if we're within tolerance from origin
176 }
177 // Once the user has moved farther than tolerance from the original location
178 // (indicating they intend to move the object, not click), then always process the
179 // motion notify coordinates as given (no snapping back to origin)
180 within_tolerance = false;
182 Geom::Point const motion_w(event->motion.x, event->motion.y);
183 Geom::Point const motion_dt(desktop->w2d(motion_w));
184 Inkscape::Rubberband::get(desktop)->move(motion_dt);
185 gobble_motion_events(GDK_BUTTON1_MASK);
186 }
187 break;
189 case GDK_BUTTON_RELEASE:
190 {
191 Geom::Point const button_w(event->button.x, event->button.y);
192 Geom::Point const button_dt(desktop->w2d(button_w));
193 if ( event->button.button == 1 && !event_context->space_panning) {
194 Geom::OptRect const b = Inkscape::Rubberband::get(desktop)->getRectangle();
195 if (b && !within_tolerance) {
196 desktop->set_display_area(*b, 10);
197 } else if (!escaped) {
198 double const zoom_rel( (event->button.state & GDK_SHIFT_MASK)
199 ? 1 / zoom_inc
200 : zoom_inc );
201 desktop->zoom_relative_keep_point(button_dt, zoom_rel);
202 }
203 ret = TRUE;
204 }
205 Inkscape::Rubberband::get(desktop)->stop();
207 if (zc->grabbed) {
208 sp_canvas_item_ungrab(zc->grabbed, event->button.time);
209 zc->grabbed = NULL;
210 }
212 xp = yp = 0;
213 escaped = false;
214 break;
215 }
216 case GDK_KEY_PRESS:
217 switch (get_group0_keyval (&event->key)) {
218 case GDK_Escape:
219 Inkscape::Rubberband::get(desktop)->stop();
220 xp = yp = 0;
221 escaped = true;
222 ret = TRUE;
223 break;
224 case GDK_Up:
225 case GDK_Down:
226 case GDK_KP_Up:
227 case GDK_KP_Down:
228 // prevent the zoom field from activation
229 if (!MOD__CTRL_ONLY)
230 ret = TRUE;
231 break;
232 case GDK_Shift_L:
233 case GDK_Shift_R:
234 event_context->cursor_shape = cursor_zoom_out_xpm;
235 sp_event_context_update_cursor(event_context);
236 break;
237 default:
238 break;
239 }
240 break;
241 case GDK_KEY_RELEASE:
242 switch (get_group0_keyval (&event->key)) {
243 case GDK_Shift_L:
244 case GDK_Shift_R:
245 event_context->cursor_shape = cursor_zoom_xpm;
246 sp_event_context_update_cursor(event_context);
247 break;
248 default:
249 break;
250 }
251 break;
252 default:
253 break;
254 }
256 if (!ret) {
257 if (((SPEventContextClass *) parent_class)->root_handler) {
258 ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
259 }
260 }
262 return ret;
263 }
265 /*
266 Local Variables:
267 mode:c++
268 c-file-style:"stroustrup"
269 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
270 indent-tabs-mode:nil
271 fill-column:99
272 End:
273 */
274 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :