src/zoom-context.cpp

   1 #define __SP_ZOOM_CONTEXT_C__
   2
   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  */
  15
  16
  17 #include <gdk/gdkkeysyms.h>
  18
  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 "pixmaps/cursor-zoom.pixbuf"
  25 #include "pixmaps/cursor-zoom-out.pixbuf"
  26 #include "prefs-utils.h"
  27
  28 #include "zoom-context.h"
  29
  30 static void sp_zoom_context_class_init(SPZoomContextClass *klass);
  31 static void sp_zoom_context_init(SPZoomContext *zoom_context);
  32 static void sp_zoom_context_setup(SPEventContext *ec);
  33 static void sp_zoom_context_finish (SPEventContext *ec);
  34
  35 static gint sp_zoom_context_root_handler(SPEventContext *event_context, GdkEvent *event);
  36 static gint sp_zoom_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
  37
  38 static SPEventContextClass *parent_class;
  39
  40 static gint xp = 0, yp = 0; // where drag started
  41 static gint tolerance = 0;
  42 static bool within_tolerance = false;
  43 static bool escaped;
  44
  45 GType sp_zoom_context_get_type(void)
  46 {
  47     static GType type = 0;
  48
  49     if (!type) {
  50         GTypeInfo info = {
  51             sizeof(SPZoomContextClass),
  52             NULL, NULL,
  53             (GClassInitFunc) sp_zoom_context_class_init,
  54             NULL, NULL,
  55             sizeof(SPZoomContext),
  56             4,
  57             (GInstanceInitFunc) sp_zoom_context_init,
  58             NULL,       /* value_table */
  59         };
  60         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPZoomContext", &info, (GTypeFlags) 0);
  61     }
  62
  63     return type;
  64 }
  65
  66 static void sp_zoom_context_class_init(SPZoomContextClass *klass)
  67 {
  68     SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
  69
  70     parent_class = (SPEventContextClass*) g_type_class_peek_parent(klass);
  71
  72     event_context_class->setup = sp_zoom_context_setup;
  73     event_context_class->finish = sp_zoom_context_finish;
  74
  75     event_context_class->root_handler = sp_zoom_context_root_handler;
  76     event_context_class->item_handler = sp_zoom_context_item_handler;
  77 }
  78
  79 static void sp_zoom_context_init (SPZoomContext *zoom_context)
  80 {
  81     SPEventContext *event_context = SP_EVENT_CONTEXT(zoom_context);
  82
  83     event_context->cursor_shape = cursor_zoom_xpm;
  84     event_context->cursor_pixbuf = gdk_pixbuf_new_from_inline(
  85             -1,
  86             cursor_zoom_pixbuf,
  87             FALSE,
  88             NULL);
  89     event_context->hot_x = 9;
  90     event_context->hot_y = 9;
  91 }
  92
  93 static void
  94 sp_zoom_context_finish (SPEventContext *ec)
  95 {
  96         ec->enableGrDrag(false);
  97 }
  98
  99 static void sp_zoom_context_setup(SPEventContext *ec)
 100 {
 101     if (prefs_get_int_attribute("tools.zoom", "selcue", 0) != 0) {
 102         ec->enableSelectionCue();
 103     }
 104     if (prefs_get_int_attribute("tools.zoom", "gradientdrag", 0) != 0) {
 105         ec->enableGrDrag();
 106     }
 107
 108     if (((SPEventContextClass *) parent_class)->setup) {
 109         ((SPEventContextClass *) parent_class)->setup(ec);
 110     }
 111 }
 112
 113 static gint sp_zoom_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
 114 {
 115     gint ret = FALSE;
 116
 117     if (((SPEventContextClass *) parent_class)->item_handler) {
 118         ret = ((SPEventContextClass *) parent_class)->item_handler (event_context, item, event);
 119     }
 120
 121     return ret;
 122 }
 123
 124 static gint sp_zoom_context_root_handler(SPEventContext *event_context, GdkEvent *event)
 125 {
 126     SPDesktop *desktop = event_context->desktop;
 127     tolerance = prefs_get_int_attribute_limited ("options.dragtolerance", "value", 0, 0, 100);
 128     double const zoom_inc = prefs_get_double_attribute_limited("options.zoomincrement", "value", M_SQRT2, 1.01, 10);
 129
 130     gint ret = FALSE;
 131
 132     switch (event->type) {
 133         case GDK_BUTTON_PRESS:
 134             if (event->button.button == 1) {
 135                 // save drag origin
 136                 xp = (gint) event->button.x;
 137                 yp = (gint) event->button.y;
 138                 within_tolerance = true;
 139
 140                 NR::Point const button_w(event->button.x, event->button.y);
 141                 NR::Point const button_dt(desktop->w2d(button_w));
 142                 Inkscape::Rubberband::get()->start(desktop, button_dt);
 143
 144                 escaped = false;
 145
 146                 ret = TRUE;
 147             }
 148             break;
 149
 150         case GDK_MOTION_NOTIFY:
 151             if (event->motion.state & GDK_BUTTON1_MASK) {
 152                 ret = TRUE;
 153
 154                 if ( within_tolerance
 155                      && ( abs( (gint) event->motion.x - xp ) < tolerance )
 156                      && ( abs( (gint) event->motion.y - yp ) < tolerance ) ) {
 157                     break; // do not drag if we're within tolerance from origin
 158                 }
 159                 // Once the user has moved farther than tolerance from the original location
 160                 // (indicating they intend to move the object, not click), then always process the
 161                 // motion notify coordinates as given (no snapping back to origin)
 162                 within_tolerance = false;
 163
 164                 NR::Point const motion_w(event->motion.x, event->motion.y);
 165                 NR::Point const motion_dt(desktop->w2d(motion_w));
 166                 Inkscape::Rubberband::get()->move(motion_dt);
 167             }
 168             break;
 169
 170         case GDK_BUTTON_RELEASE:
 171             if ( event->button.button == 1 ) {
 172                 NR::Maybe<NR::Rect> const b = Inkscape::Rubberband::get()->getRectangle();
 173                 if (b != NR::Nothing() && !within_tolerance) {
 174                     desktop->set_display_area(b.assume(), 10);
 175                 } else if (!escaped) {
 176                     NR::Point const button_w(event->button.x, event->button.y);
 177                     NR::Point const button_dt(desktop->w2d(button_w));
 178                     double const zoom_rel( (event->button.state & GDK_SHIFT_MASK)
 179                                            ? 1 / zoom_inc
 180                                            : zoom_inc );
 181                     desktop->zoom_relative_keep_point(button_dt, zoom_rel);
 182                 }
 183                 ret = TRUE;
 184             }
 185             Inkscape::Rubberband::get()->stop();
 186             xp = yp = 0;
 187             escaped = false;
 188             break;
 189
 190         case GDK_KEY_PRESS:
 191             switch (get_group0_keyval (&event->key)) {
 192                 case GDK_Escape:
 193                     Inkscape::Rubberband::get()->stop();
 194                     xp = yp = 0;
 195                     escaped = true;
 196                     ret = TRUE;
 197                     break;
 198                 case GDK_Up:
 199                 case GDK_Down:
 200                 case GDK_KP_Up:
 201                 case GDK_KP_Down:
 202                     // prevent the zoom field from activation
 203                     if (!MOD__CTRL_ONLY)
 204                         ret = TRUE;
 205                     break;
 206                 case GDK_Shift_L:
 207                 case GDK_Shift_R:
 208                     event_context->cursor_shape = cursor_zoom_out_xpm;
 209                     event_context->cursor_pixbuf = gdk_pixbuf_new_from_inline(
 210                             -1,
 211                             cursor_zoom_out_pixbuf,
 212                             FALSE,
 213                             NULL);
 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                     event_context->cursor_pixbuf = gdk_pixbuf_new_from_inline(
 226                             -1,
 227                             cursor_zoom_pixbuf,
 228                             FALSE,
 229                             NULL);
 230                     sp_event_context_update_cursor(event_context);
 231                     break;
 232                 default:
 233                     break;
 234             }
 235             break;
 236         default:
 237             break;
 238     }
 239
 240     if (!ret) {
 241         if (((SPEventContextClass *) parent_class)->root_handler) {
 242             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
 243         }
 244     }
 245
 246     return ret;
 247 }
 248
 249 /*
 250   Local Variables:
 251   mode:c++
 252   c-file-style:"stroustrup"
 253   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 254   indent-tabs-mode:nil
 255   fill-column:99
 256   End:
 257 */
 258 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :