Code

small cleanup in src/trace (warnings and trailing spaces)
[inkscape.git] / src / zoom-context.cpp
1 #define __SP_ZOOM_CONTEXT_C__
3 /*
4  * Handy zooming tool
5  *
6  * Authors:
7  *   Lauris Kaplinski <lauris@kaplinski.com>
8  *   Frank Felfe <innerspace@iname.com>
9  *   bulia byak <buliabyak@users.sf.net>
10  *
11  * Copyright (C) 1999-2002 Authors
12  *
13  * Released under GNU GPL, read the file 'COPYING' for more information
14  */
17 #include <gdk/gdkkeysyms.h>
19 #include "macros.h"
20 #include "rubberband.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         ec->enableGrDrag(false);
90 }
92 static void sp_zoom_context_setup(SPEventContext *ec)
93 {
94     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
95     if (prefs->getBool("/tools/zoom/selcue")) {
96         ec->enableSelectionCue();
97     }
98     if (prefs->getBool("/tools/zoom/gradientdrag")) {
99         ec->enableGrDrag();
100     }
102     if (((SPEventContextClass *) parent_class)->setup) {
103         ((SPEventContextClass *) parent_class)->setup(ec);
104     }
107 static gint sp_zoom_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
109     gint ret = FALSE;
111     if (((SPEventContextClass *) parent_class)->item_handler) {
112         ret = ((SPEventContextClass *) parent_class)->item_handler (event_context, item, event);
113     }
115     return ret;
118 static gint sp_zoom_context_root_handler(SPEventContext *event_context, GdkEvent *event)
120     SPDesktop *desktop = event_context->desktop;
121     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
122     tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
123     double const zoom_inc = prefs->getDoubleLimited("/options/zoomincrement/value", M_SQRT2, 1.01, 10);
125     gint ret = FALSE;
127     switch (event->type) {
128         case GDK_BUTTON_PRESS:
129         {
130             Geom::Point const button_w(event->button.x, event->button.y);
131             Geom::Point const button_dt(desktop->w2d(button_w));
132             if (event->button.button == 1 && !event_context->space_panning) {
133                 // save drag origin
134                 xp = (gint) event->button.x;
135                 yp = (gint) event->button.y;
136                 within_tolerance = true;
138                 Inkscape::Rubberband::get(desktop)->start(desktop, button_dt);
140                 escaped = false;
142                 ret = TRUE;
143             } else if (event->button.button == 3) {
144                 double const zoom_rel( (event->button.state & GDK_SHIFT_MASK)
145                                        ? zoom_inc
146                                        : 1 / zoom_inc );
147                 desktop->zoom_relative_keep_point(button_dt, zoom_rel);
148                 ret = TRUE;
149             }
150             break;
151         }
153         case GDK_MOTION_NOTIFY:
154             if (event->motion.state & GDK_BUTTON1_MASK && !event_context->space_panning) {
155                 ret = TRUE;
157                 if ( within_tolerance
158                      && ( abs( (gint) event->motion.x - xp ) < tolerance )
159                      && ( abs( (gint) event->motion.y - yp ) < tolerance ) ) {
160                     break; // do not drag if we're within tolerance from origin
161                 }
162                 // Once the user has moved farther than tolerance from the original location
163                 // (indicating they intend to move the object, not click), then always process the
164                 // motion notify coordinates as given (no snapping back to origin)
165                 within_tolerance = false;
167                 Geom::Point const motion_w(event->motion.x, event->motion.y);
168                 Geom::Point const motion_dt(desktop->w2d(motion_w));
169                 Inkscape::Rubberband::get(desktop)->move(motion_dt);
170                 gobble_motion_events(GDK_BUTTON1_MASK);
171             }
172             break;
174         case GDK_BUTTON_RELEASE:
175         {
176             Geom::Point const button_w(event->button.x, event->button.y);
177             Geom::Point const button_dt(desktop->w2d(button_w));
178             if ( event->button.button == 1  && !event_context->space_panning) {
179                 Geom::OptRect const b = Inkscape::Rubberband::get(desktop)->getRectangle();
180                 if (b && !within_tolerance) {
181                     desktop->set_display_area(*b, 10);
182                 } else if (!escaped) {
183                     double const zoom_rel( (event->button.state & GDK_SHIFT_MASK)
184                                            ? 1 / zoom_inc
185                                            : zoom_inc );
186                     desktop->zoom_relative_keep_point(button_dt, zoom_rel);
187                 }
188                 ret = TRUE;
189             } 
190             Inkscape::Rubberband::get(desktop)->stop();
191             xp = yp = 0;
192             escaped = false;
193             break;
194         }
195         case GDK_KEY_PRESS:
196             switch (get_group0_keyval (&event->key)) {
197                 case GDK_Escape:
198                     Inkscape::Rubberband::get(desktop)->stop();
199                     xp = yp = 0;
200                     escaped = true;
201                     ret = TRUE;
202                     break;
203                 case GDK_Up:
204                 case GDK_Down:
205                 case GDK_KP_Up:
206                 case GDK_KP_Down:
207                     // prevent the zoom field from activation
208                     if (!MOD__CTRL_ONLY)
209                         ret = TRUE;
210                     break;
211                 case GDK_Shift_L:
212                 case GDK_Shift_R:
213                     event_context->cursor_shape = cursor_zoom_out_xpm;
214                     sp_event_context_update_cursor(event_context);
215                     break;
216                 default:
217                         break;
218                 }
219                 break;
220         case GDK_KEY_RELEASE:
221             switch (get_group0_keyval (&event->key)) {
222                 case GDK_Shift_L:
223                 case GDK_Shift_R:
224                     event_context->cursor_shape = cursor_zoom_xpm;
225                     sp_event_context_update_cursor(event_context);
226                     break;
227                 default:
228                     break;
229                 }
230             break;
231         default:
232             break;
233     }
235     if (!ret) {
236         if (((SPEventContextClass *) parent_class)->root_handler) {
237             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
238         }
239     }
241     return ret;
244 /*
245   Local Variables:
246   mode:c++
247   c-file-style:"stroustrup"
248   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
249   indent-tabs-mode:nil
250   fill-column:99
251   End:
252 */
253 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :