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         static GtkType type = 0;
  50         if (!type) {
  51                 static const GtkTypeInfo info = {
  52                         "SPWidget",
  53                         sizeof (SPWidget),
  54                         sizeof (SPWidgetClass),
  55                         (GtkClassInitFunc) sp_widget_class_init,
  56                         (GtkObjectInitFunc) sp_widget_init,
  57                         NULL, NULL, NULL
  58                 };
  59                 type = gtk_type_unique (GTK_TYPE_BIN, &info);
  60         }
  61         return type;
  62 }
  63
  64 static void
  65 sp_widget_class_init (SPWidgetClass *klass)
  66 {
  67         GtkObjectClass *object_class;
  68         GtkWidgetClass *widget_class;
  69
  70         object_class = (GtkObjectClass *) klass;
  71         widget_class = (GtkWidgetClass *) klass;
  72
  73         parent_class = (GtkBinClass*)gtk_type_class (GTK_TYPE_BIN);
  74
  75         object_class->destroy = sp_widget_destroy;
  76
  77         signals[CONSTRUCT] =        gtk_signal_new ("construct",
  78                                                     GTK_RUN_FIRST,
  79                                                     GTK_CLASS_TYPE(object_class),
  80                                                     GTK_SIGNAL_OFFSET (SPWidgetClass, construct),
  81                                                     gtk_marshal_NONE__NONE,
  82                                                     GTK_TYPE_NONE, 0);
  83         signals[CHANGE_SELECTION] = gtk_signal_new ("change_selection",
  84                                                     GTK_RUN_FIRST,
  85                                                     GTK_CLASS_TYPE(object_class),
  86                                                     GTK_SIGNAL_OFFSET (SPWidgetClass, change_selection),
  87                                                     gtk_marshal_NONE__POINTER,
  88                                                     GTK_TYPE_NONE, 1,
  89                                                     GTK_TYPE_POINTER);
  90         signals[MODIFY_SELECTION] = gtk_signal_new ("modify_selection",
  91                                                     GTK_RUN_FIRST,
  92                                                     GTK_CLASS_TYPE(object_class),
  93                                                     GTK_SIGNAL_OFFSET (SPWidgetClass, modify_selection),
  94                                                     gtk_marshal_NONE__POINTER_UINT,
  95                                                     GTK_TYPE_NONE, 2,
  96                                                     GTK_TYPE_POINTER, GTK_TYPE_UINT);
  97         signals[SET_SELECTION] =    gtk_signal_new ("set_selection",
  98                                                     GTK_RUN_FIRST,
  99                                                     GTK_CLASS_TYPE(object_class),
 100                                                     GTK_SIGNAL_OFFSET (SPWidgetClass, set_selection),
 101                                                     gtk_marshal_NONE__POINTER,
 102                                                     GTK_TYPE_NONE, 1,
 103                                                     GTK_TYPE_POINTER);
 104
 105         widget_class->show = sp_widget_show;
 106         widget_class->hide = sp_widget_hide;
 107         widget_class->expose_event = sp_widget_expose;
 108         widget_class->size_request = sp_widget_size_request;
 109         widget_class->size_allocate = sp_widget_size_allocate;
 110 }
 111
 112 static void
 113 sp_widget_init (SPWidget *spw)
 114 {
 115         spw->inkscape = NULL;
 116 }
 117
 118 static void
 119 sp_widget_destroy (GtkObject *object)
 120 {
 121         SPWidget *spw;
 122
 123         spw = (SPWidget *) object;
 124
 125         if (spw->inkscape) {
 126                 /* Disconnect signals */
 127                 // the checks are necessary because when destroy is caused by the the program shutting down,
 128                 // the inkscape object may already be (partly?) invalid --bb
 129                 if (G_IS_OBJECT(spw->inkscape) && G_OBJECT_GET_CLASS(G_OBJECT(spw->inkscape)))
 130                         sp_signal_disconnect_by_data (spw->inkscape, spw);
 131                 spw->inkscape = NULL;
 132         }
 133
 134         if (((GtkObjectClass *) parent_class)->destroy)
 135                 (* ((GtkObjectClass *) parent_class)->destroy) (object);
 136 }
 137
 138 static void
 139 sp_widget_show (GtkWidget *widget)
 140 {
 141         SPWidget *spw;
 142
 143         spw = SP_WIDGET (widget);
 144
 145         if (spw->inkscape) {
 146                 /* Connect signals */
 147                 g_signal_connect (G_OBJECT (spw->inkscape), "modify_selection", G_CALLBACK (sp_widget_modify_selection), spw);
 148                 g_signal_connect (G_OBJECT (spw->inkscape), "change_selection", G_CALLBACK (sp_widget_change_selection), spw);
 149                 g_signal_connect (G_OBJECT (spw->inkscape), "set_selection", G_CALLBACK (sp_widget_set_selection), spw);
 150         }
 151
 152         if (((GtkWidgetClass *) parent_class)->show)
 153                 (* ((GtkWidgetClass *) parent_class)->show) (widget);
 154 }
 155
 156 static void
 157 sp_widget_hide (GtkWidget *widget)
 158 {
 159         SPWidget *spw;
 160
 161         spw = SP_WIDGET (widget);
 162
 163         if (spw->inkscape) {
 164                 /* Disconnect signals */
 165                 sp_signal_disconnect_by_data (spw->inkscape, spw);
 166         }
 167
 168         if (((GtkWidgetClass *) parent_class)->hide)
 169                 (* ((GtkWidgetClass *) parent_class)->hide) (widget);
 170 }
 171
 172 static gint
 173 sp_widget_expose (GtkWidget *widget, GdkEventExpose *event)
 174 {
 175         GtkBin *bin;
 176
 177         bin = GTK_BIN (widget);
 178
 179         if ( bin->child ) {
 180             gtk_container_propagate_expose (GTK_CONTAINER(widget), bin->child, event);
 181         }
 182         /*
 183         if ((bin->child) && (GTK_WIDGET_NO_WINDOW (bin->child))) {
 184                 GdkEventExpose ce;
 185                 ce = *event;
 186                 gtk_widget_event (bin->child, (GdkEvent *) &ce);
 187         }
 188         */
 189
 190         return FALSE;
 191 }
 192
 193 static void
 194 sp_widget_size_request (GtkWidget *widget, GtkRequisition *requisition)
 195 {
 196         if (((GtkBin *) widget)->child)
 197                 gtk_widget_size_request (((GtkBin *) widget)->child, requisition);
 198 }
 199
 200 static void
 201 sp_widget_size_allocate (GtkWidget *widget, GtkAllocation *allocation)
 202 {
 203         widget->allocation = *allocation;
 204
 205         if (((GtkBin *) widget)->child)
 206                 gtk_widget_size_allocate (((GtkBin *) widget)->child, allocation);
 207 }
 208
 209 /* Methods */
 210
 211 GtkWidget *
 212 sp_widget_new_global (Inkscape::Application *inkscape)
 213 {
 214         SPWidget *spw;
 215
 216         spw = (SPWidget*)gtk_type_new (SP_TYPE_WIDGET);
 217
 218         if (!sp_widget_construct_global (spw, inkscape)) {
 219                 gtk_object_unref (GTK_OBJECT (spw));
 220                 return NULL;
 221         }
 222
 223         return (GtkWidget *) spw;
 224 }
 225
 226 GtkWidget *
 227 sp_widget_construct_global (SPWidget *spw, Inkscape::Application *inkscape)
 228 {
 229         g_return_val_if_fail (!spw->inkscape, NULL);
 230
 231         spw->inkscape = inkscape;
 232         if (GTK_WIDGET_VISIBLE (spw)) {
 233                 g_signal_connect (G_OBJECT (inkscape), "modify_selection", G_CALLBACK (sp_widget_modify_selection), spw);
 234                 g_signal_connect (G_OBJECT (inkscape), "change_selection", G_CALLBACK (sp_widget_change_selection), spw);
 235                 g_signal_connect (G_OBJECT (inkscape), "set_selection", G_CALLBACK (sp_widget_set_selection), spw);
 236         }
 237
 238         g_signal_emit (G_OBJECT (spw), signals[CONSTRUCT], 0);
 239
 240         return (GtkWidget *) spw;
 241 }
 242
 243 static void
 244 sp_widget_modify_selection (Inkscape::Application *inkscape, Inkscape::Selection *selection, guint flags, SPWidget *spw)
 245 {
 246         g_signal_emit (G_OBJECT (spw), signals[MODIFY_SELECTION], 0, selection, flags);
 247 }
 248
 249 static void
 250 sp_widget_change_selection (Inkscape::Application *inkscape, Inkscape::Selection *selection, SPWidget *spw)
 251 {
 252         g_signal_emit (G_OBJECT (spw), signals[CHANGE_SELECTION], 0, selection);
 253 }
 254
 255 static void
 256 sp_widget_set_selection (Inkscape::Application *inkscape, Inkscape::Selection *selection, SPWidget *spw)
 257 {
 258         /* Emit "set_selection" signal */
 259         g_signal_emit (G_OBJECT (spw), signals[SET_SELECTION], 0, selection);
 260         /* Inkscape will force "change_selection" anyways */
 261 }
 262