src/widgets/sp-widget.cpp

   1 #define __SP_WIDGET_C__
   2
   3 /*
   4  * Abstract base class for dynamic control widgets
   5  *
   6  * Authors:
   7  *   Lauris Kaplinski <lauris@kaplinski.com>
   8  *   bulia byak <buliabyak@users.sf.net>
   9  *
  10  * Copyright (C) 1999-2002 Lauris Kaplinski
  11  * Copyright (C) 2000-2001 Ximian, Inc.
  12  *
  13  * Released under GNU GPL, read the file 'COPYING' for more information
  14  */
  15
  16 #include "macros.h"
  17 #include "../document.h"
  18 #include "sp-widget.h"
  19
  20 enum {
  21         CONSTRUCT,
  22         MODIFY_SELECTION,
  23         CHANGE_SELECTION,
  24         SET_SELECTION,
  25         LAST_SIGNAL
  26 };
  27
  28 static void sp_widget_class_init (SPWidgetClass *klass);
  29 static void sp_widget_init (SPWidget *widget);
  30
  31 static void sp_widget_destroy (GtkObject *object);
  32
  33 static void sp_widget_show (GtkWidget *widget);
  34 static void sp_widget_hide (GtkWidget *widget);
  35 static gint sp_widget_expose (GtkWidget *widget, GdkEventExpose *event);
  36 static void sp_widget_size_request (GtkWidget *widget, GtkRequisition *requisition);
  37 static void sp_widget_size_allocate (GtkWidget *widget, GtkAllocation *allocation);
  38
  39 static void sp_widget_modify_selection (Inkscape::Application *inkscape, Inkscape::Selection *selection, guint flags, SPWidget *spw);
  40 static void sp_widget_change_selection (Inkscape::Application *inkscape, Inkscape::Selection *selection, SPWidget *spw);
  41 static void sp_widget_set_selection (Inkscape::Application *inkscape, Inkscape::Selection *selection, SPWidget *spw);
  42
  43 static GtkBinClass *parent_class;
  44 static guint signals[LAST_SIGNAL] = {0};
  45
  46 GtkType
  47 sp_widget_get_type (void)
  48 {
  49     //TODO: switch to GObject
  50     // GtkType and such calls were deprecated a while back with the
  51     // introduction of GObject as a separate layer, with GType instead. --JonCruz
  52
  53         static GtkType type = 0;
  54         if (!type) {
  55                 static const GtkTypeInfo info = {
  56                         (gchar*) "SPWidget",
  57                         sizeof (SPWidget),
  58                         sizeof (SPWidgetClass),
  59                         (GtkClassInitFunc) sp_widget_class_init,
  60                         (GtkObjectInitFunc) sp_widget_init,
  61                         NULL, NULL, NULL
  62                 };
  63                 type = gtk_type_unique (GTK_TYPE_BIN, &info);
  64         }
  65         return type;
  66 }
  67
  68 static void
  69 sp_widget_class_init (SPWidgetClass *klass)
  70 {
  71         GtkObjectClass *object_class;
  72         GtkWidgetClass *widget_class;
  73
  74         object_class = (GtkObjectClass *) klass;
  75         widget_class = (GtkWidgetClass *) klass;
  76
  77         parent_class = (GtkBinClass*)gtk_type_class (GTK_TYPE_BIN);
  78
  79         object_class->destroy = sp_widget_destroy;
  80
  81         signals[CONSTRUCT] =        gtk_signal_new ("construct",
  82                                                     GTK_RUN_FIRST,
  83                                                     GTK_CLASS_TYPE(object_class),
  84                                                     GTK_SIGNAL_OFFSET (SPWidgetClass, construct),
  85                                                     gtk_marshal_NONE__NONE,
  86                                                     GTK_TYPE_NONE, 0);
  87         signals[CHANGE_SELECTION] = gtk_signal_new ("change_selection",
  88                                                     GTK_RUN_FIRST,
  89                                                     GTK_CLASS_TYPE(object_class),
  90                                                     GTK_SIGNAL_OFFSET (SPWidgetClass, change_selection),
  91                                                     gtk_marshal_NONE__POINTER,
  92                                                     GTK_TYPE_NONE, 1,
  93                                                     GTK_TYPE_POINTER);
  94         signals[MODIFY_SELECTION] = gtk_signal_new ("modify_selection",
  95                                                     GTK_RUN_FIRST,
  96                                                     GTK_CLASS_TYPE(object_class),
  97                                                     GTK_SIGNAL_OFFSET (SPWidgetClass, modify_selection),
  98                                                     gtk_marshal_NONE__POINTER_UINT,
  99                                                     GTK_TYPE_NONE, 2,
 100                                                     GTK_TYPE_POINTER, GTK_TYPE_UINT);
 101         signals[SET_SELECTION] =    gtk_signal_new ("set_selection",
 102                                                     GTK_RUN_FIRST,
 103                                                     GTK_CLASS_TYPE(object_class),
 104                                                     GTK_SIGNAL_OFFSET (SPWidgetClass, set_selection),
 105                                                     gtk_marshal_NONE__POINTER,
 106                                                     GTK_TYPE_NONE, 1,
 107                                                     GTK_TYPE_POINTER);
 108
 109         widget_class->show = sp_widget_show;
 110         widget_class->hide = sp_widget_hide;
 111         widget_class->expose_event = sp_widget_expose;
 112         widget_class->size_request = sp_widget_size_request;
 113         widget_class->size_allocate = sp_widget_size_allocate;
 114 }
 115
 116 static void
 117 sp_widget_init (SPWidget *spw)
 118 {
 119         spw->inkscape = NULL;
 120 }
 121
 122 static void
 123 sp_widget_destroy (GtkObject *object)
 124 {
 125         SPWidget *spw;
 126
 127         spw = (SPWidget *) object;
 128
 129         if (spw->inkscape) {
 130                 /* Disconnect signals */
 131                 // the checks are necessary because when destroy is caused by the the program shutting down,
 132                 // the inkscape object may already be (partly?) invalid --bb
 133                 if (G_IS_OBJECT(spw->inkscape) && G_OBJECT_GET_CLASS(G_OBJECT(spw->inkscape)))
 134                         sp_signal_disconnect_by_data (spw->inkscape, spw);
 135                 spw->inkscape = NULL;
 136         }
 137
 138         if (((GtkObjectClass *) parent_class)->destroy)
 139                 (* ((GtkObjectClass *) parent_class)->destroy) (object);
 140 }
 141
 142 static void
 143 sp_widget_show (GtkWidget *widget)
 144 {
 145         SPWidget *spw;
 146
 147         spw = SP_WIDGET (widget);
 148
 149         if (spw->inkscape) {
 150                 /* Connect signals */
 151                 g_signal_connect (G_OBJECT (spw->inkscape), "modify_selection", G_CALLBACK (sp_widget_modify_selection), spw);
 152                 g_signal_connect (G_OBJECT (spw->inkscape), "change_selection", G_CALLBACK (sp_widget_change_selection), spw);
 153                 g_signal_connect (G_OBJECT (spw->inkscape), "set_selection", G_CALLBACK (sp_widget_set_selection), spw);
 154         }
 155
 156         if (((GtkWidgetClass *) parent_class)->show)
 157                 (* ((GtkWidgetClass *) parent_class)->show) (widget);
 158 }
 159
 160 static void
 161 sp_widget_hide (GtkWidget *widget)
 162 {
 163         SPWidget *spw;
 164
 165         spw = SP_WIDGET (widget);
 166
 167         if (spw->inkscape) {
 168                 /* Disconnect signals */
 169                 sp_signal_disconnect_by_data (spw->inkscape, spw);
 170         }
 171
 172         if (((GtkWidgetClass *) parent_class)->hide)
 173                 (* ((GtkWidgetClass *) parent_class)->hide) (widget);
 174 }
 175
 176 static gint
 177 sp_widget_expose (GtkWidget *widget, GdkEventExpose *event)
 178 {
 179         GtkBin *bin;
 180
 181         bin = GTK_BIN (widget);
 182
 183         if ( bin->child ) {
 184             gtk_container_propagate_expose (GTK_CONTAINER(widget), bin->child, event);
 185         }
 186         /*
 187         if ((bin->child) && (GTK_WIDGET_NO_WINDOW (bin->child))) {
 188                 GdkEventExpose ce;
 189                 ce = *event;
 190                 gtk_widget_event (bin->child, (GdkEvent *) &ce);
 191         }
 192         */
 193
 194         return FALSE;
 195 }
 196
 197 static void
 198 sp_widget_size_request (GtkWidget *widget, GtkRequisition *requisition)
 199 {
 200         if (((GtkBin *) widget)->child)
 201                 gtk_widget_size_request (((GtkBin *) widget)->child, requisition);
 202 }
 203
 204 static void
 205 sp_widget_size_allocate (GtkWidget *widget, GtkAllocation *allocation)
 206 {
 207         widget->allocation = *allocation;
 208
 209         if (((GtkBin *) widget)->child)
 210                 gtk_widget_size_allocate (((GtkBin *) widget)->child, allocation);
 211 }
 212
 213 /* Methods */
 214
 215 GtkWidget *
 216 sp_widget_new_global (Inkscape::Application *inkscape)
 217 {
 218         SPWidget *spw;
 219
 220         spw = (SPWidget*)gtk_type_new (SP_TYPE_WIDGET);
 221
 222         if (!sp_widget_construct_global (spw, inkscape)) {
 223                 gtk_object_unref (GTK_OBJECT (spw));
 224                 return NULL;
 225         }
 226
 227         return (GtkWidget *) spw;
 228 }
 229
 230 GtkWidget *
 231 sp_widget_construct_global (SPWidget *spw, Inkscape::Application *inkscape)
 232 {
 233         g_return_val_if_fail (!spw->inkscape, NULL);
 234
 235         spw->inkscape = inkscape;
 236         if (GTK_WIDGET_VISIBLE (spw)) {
 237                 g_signal_connect (G_OBJECT (inkscape), "modify_selection", G_CALLBACK (sp_widget_modify_selection), spw);
 238                 g_signal_connect (G_OBJECT (inkscape), "change_selection", G_CALLBACK (sp_widget_change_selection), spw);
 239                 g_signal_connect (G_OBJECT (inkscape), "set_selection", G_CALLBACK (sp_widget_set_selection), spw);
 240         }
 241
 242         g_signal_emit (G_OBJECT (spw), signals[CONSTRUCT], 0);
 243
 244         return (GtkWidget *) spw;
 245 }
 246
 247 static void
 248 sp_widget_modify_selection (Inkscape::Application */*inkscape*/, Inkscape::Selection *selection, guint flags, SPWidget *spw)
 249 {
 250         g_signal_emit (G_OBJECT (spw), signals[MODIFY_SELECTION], 0, selection, flags);
 251 }
 252
 253 static void
 254 sp_widget_change_selection (Inkscape::Application */*inkscape*/, Inkscape::Selection *selection, SPWidget *spw)
 255 {
 256         g_signal_emit (G_OBJECT (spw), signals[CHANGE_SELECTION], 0, selection);
 257 }
 258
 259 static void
 260 sp_widget_set_selection (Inkscape::Application */*inkscape*/, Inkscape::Selection *selection, SPWidget *spw)
 261 {
 262         /* Emit "set_selection" signal */
 263         g_signal_emit (G_OBJECT (spw), signals[SET_SELECTION], 0, selection);
 264         /* Inkscape will force "change_selection" anyways */
 265 }
 266
 267 /*
 268   Local Variables:
 269   mode:c++
 270   c-file-style:"stroustrup"
 271   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 272   indent-tabs-mode:nil
 273   fill-column:99
 274   End:
 275 */
 276 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :