Pileus Git - ~andy/gtk/blob - gtk/gtkarrow.c

   1 /* GTK - The GIMP Toolkit
   2  * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 /*
  21  * Modified by the GTK+ Team and others 1997-2001.  See the AUTHORS
  22  * file for a list of people on the GTK+ Team.  See the ChangeLog
  23  * files for a list of changes.  These files are distributed with
  24  * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
  25  */
  26
  27 #include <config.h>
  28 #include <math.h>
  29 #include "gtkalias.h"
  30 #include "gtkarrow.h"
  31 #include "gtkintl.h"
  32
  33 #define MIN_ARROW_SIZE  15
  34
  35 enum {
  36   PROP_0,
  37
  38   PROP_ARROW_TYPE,
  39   PROP_SHADOW_TYPE,
  40
  41   PROP_LAST
  42 };
  43
  44
  45 static void gtk_arrow_class_init (GtkArrowClass  *klass);
  46 static void gtk_arrow_init       (GtkArrow       *arrow);
  47 static gint gtk_arrow_expose     (GtkWidget      *widget,
  48                                   GdkEventExpose *event);
  49 static void gtk_arrow_set_property (GObject         *object,
  50                                     guint            prop_id,
  51                                     const GValue    *value,
  52                                     GParamSpec      *pspec);
  53 static void gtk_arrow_get_property (GObject         *object,
  54                                     guint            prop_id,
  55                                     GValue          *value,
  56                                     GParamSpec      *pspec);
  57
  58 GType
  59 gtk_arrow_get_type (void)
  60 {
  61   static GType arrow_type = 0;
  62
  63   if (!arrow_type)
  64     {
  65       static const GTypeInfo arrow_info =
  66       {
  67         sizeof (GtkArrowClass),
  68         NULL,           /* base_init */
  69         NULL,           /* base_finalize */
  70         (GClassInitFunc) gtk_arrow_class_init,
  71         NULL,           /* class_finalize */
  72         NULL,           /* class_data */
  73         sizeof (GtkArrow),
  74         0,              /* n_preallocs */
  75         (GInstanceInitFunc) gtk_arrow_init,
  76       };
  77
  78       arrow_type = g_type_register_static (GTK_TYPE_MISC, "GtkArrow",
  79                                            &arrow_info, 0);
  80     }
  81
  82   return arrow_type;
  83 }
  84
  85 static void
  86 gtk_arrow_class_init (GtkArrowClass *class)
  87 {
  88   GObjectClass *gobject_class;
  89   GtkWidgetClass *widget_class;
  90
  91   gobject_class = (GObjectClass*) class;
  92   widget_class = (GtkWidgetClass*) class;
  93
  94   gobject_class->set_property = gtk_arrow_set_property;
  95   gobject_class->get_property = gtk_arrow_get_property;
  96
  97   g_object_class_install_property (gobject_class,
  98                                    PROP_ARROW_TYPE,
  99                                    g_param_spec_enum ("arrow-type",
 100                                                       P_("Arrow direction"),
 101                                                       P_("The direction the arrow should point"),
 102                                                       GTK_TYPE_ARROW_TYPE,
 103                                                       GTK_ARROW_RIGHT,
 104                                                       G_PARAM_READABLE | G_PARAM_WRITABLE));
 105   g_object_class_install_property (gobject_class,
 106                                    PROP_SHADOW_TYPE,
 107                                    g_param_spec_enum ("shadow-type",
 108                                                       P_("Arrow shadow"),
 109                                                       P_("Appearance of the shadow surrounding the arrow"),
 110                                                       GTK_TYPE_SHADOW_TYPE,
 111                                                       GTK_SHADOW_OUT,
 112                                                       G_PARAM_READABLE | G_PARAM_WRITABLE));
 113
 114   widget_class->expose_event = gtk_arrow_expose;
 115 }
 116
 117 static void
 118 gtk_arrow_set_property (GObject         *object,
 119                         guint            prop_id,
 120                         const GValue    *value,
 121                         GParamSpec      *pspec)
 122 {
 123   GtkArrow *arrow;
 124
 125   arrow = GTK_ARROW (object);
 126
 127   switch (prop_id)
 128     {
 129     case PROP_ARROW_TYPE:
 130       gtk_arrow_set (arrow,
 131                      g_value_get_enum (value),
 132                      arrow->shadow_type);
 133       break;
 134     case PROP_SHADOW_TYPE:
 135       gtk_arrow_set (arrow,
 136                      arrow->arrow_type,
 137                      g_value_get_enum (value));
 138       break;
 139     default:
 140       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 141       break;
 142     }
 143 }
 144
 145
 146 static void
 147 gtk_arrow_get_property (GObject         *object,
 148                         guint            prop_id,
 149                         GValue          *value,
 150                         GParamSpec      *pspec)
 151 {
 152   GtkArrow *arrow;
 153
 154   arrow = GTK_ARROW (object);
 155   switch (prop_id)
 156     {
 157     case PROP_ARROW_TYPE:
 158       g_value_set_enum (value, arrow->arrow_type);
 159       break;
 160     case PROP_SHADOW_TYPE:
 161       g_value_set_enum (value, arrow->shadow_type);
 162       break;
 163     default:
 164       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 165       break;
 166     }
 167 }
 168
 169 static void
 170 gtk_arrow_init (GtkArrow *arrow)
 171 {
 172   GTK_WIDGET_SET_FLAGS (arrow, GTK_NO_WINDOW);
 173
 174   GTK_WIDGET (arrow)->requisition.width = MIN_ARROW_SIZE + GTK_MISC (arrow)->xpad * 2;
 175   GTK_WIDGET (arrow)->requisition.height = MIN_ARROW_SIZE + GTK_MISC (arrow)->ypad * 2;
 176
 177   arrow->arrow_type = GTK_ARROW_RIGHT;
 178   arrow->shadow_type = GTK_SHADOW_OUT;
 179 }
 180
 181 GtkWidget*
 182 gtk_arrow_new (GtkArrowType  arrow_type,
 183                GtkShadowType shadow_type)
 184 {
 185   GtkArrow *arrow;
 186
 187   arrow = g_object_new (GTK_TYPE_ARROW, NULL);
 188
 189   arrow->arrow_type = arrow_type;
 190   arrow->shadow_type = shadow_type;
 191
 192   return GTK_WIDGET (arrow);
 193 }
 194
 195 void
 196 gtk_arrow_set (GtkArrow      *arrow,
 197                GtkArrowType   arrow_type,
 198                GtkShadowType  shadow_type)
 199 {
 200   g_return_if_fail (GTK_IS_ARROW (arrow));
 201
 202   if (   ((GtkArrowType) arrow->arrow_type != arrow_type)
 203       || ((GtkShadowType) arrow->shadow_type != shadow_type))
 204     {
 205       g_object_freeze_notify (G_OBJECT (arrow));
 206
 207       if ((GtkArrowType) arrow->arrow_type != arrow_type)
 208         {
 209           arrow->arrow_type = arrow_type;
 210           g_object_notify (G_OBJECT (arrow), "arrow_type");
 211         }
 212
 213       if ((GtkShadowType) arrow->shadow_type != shadow_type)
 214         {
 215           arrow->shadow_type = shadow_type;
 216           g_object_notify (G_OBJECT (arrow), "shadow_type");
 217         }
 218
 219       g_object_thaw_notify (G_OBJECT (arrow));
 220
 221       if (GTK_WIDGET_DRAWABLE (arrow))
 222         gtk_widget_queue_draw (GTK_WIDGET (arrow));
 223     }
 224 }
 225
 226
 227 static gboolean
 228 gtk_arrow_expose (GtkWidget      *widget,
 229                   GdkEventExpose *event)
 230 {
 231   GtkArrow *arrow;
 232   GtkMisc *misc;
 233   GtkShadowType shadow_type;
 234   gint width, height;
 235   gint x, y;
 236   gint extent;
 237   gfloat xalign;
 238   GtkArrowType effective_arrow_type;
 239
 240   if (GTK_WIDGET_DRAWABLE (widget))
 241     {
 242       arrow = GTK_ARROW (widget);
 243       misc = GTK_MISC (widget);
 244
 245       width = widget->allocation.width - misc->xpad * 2;
 246       height = widget->allocation.height - misc->ypad * 2;
 247       extent = MIN (width, height) * 0.7;
 248       effective_arrow_type = arrow->arrow_type;
 249
 250       if (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_LTR)
 251         xalign = misc->xalign;
 252       else
 253         {
 254           xalign = 1.0 - misc->xalign;
 255           if (arrow->arrow_type == GTK_ARROW_LEFT)
 256             effective_arrow_type = GTK_ARROW_RIGHT;
 257           else if (arrow->arrow_type == GTK_ARROW_RIGHT)
 258             effective_arrow_type = GTK_ARROW_LEFT;
 259         }
 260
 261       x = floor (widget->allocation.x + misc->xpad
 262                  + ((widget->allocation.width - extent) * xalign)
 263                  + 0.5);
 264       y = floor (widget->allocation.y + misc->ypad
 265                  + ((widget->allocation.height - extent) * misc->yalign)
 266                  + 0.5);
 267
 268       shadow_type = arrow->shadow_type;
 269
 270       if (widget->state == GTK_STATE_ACTIVE)
 271         {
 272           if (shadow_type == GTK_SHADOW_IN)
 273             shadow_type = GTK_SHADOW_OUT;
 274           else if (shadow_type == GTK_SHADOW_OUT)
 275             shadow_type = GTK_SHADOW_IN;
 276           else if (shadow_type == GTK_SHADOW_ETCHED_IN)
 277             shadow_type = GTK_SHADOW_ETCHED_OUT;
 278           else if (shadow_type == GTK_SHADOW_ETCHED_OUT)
 279             shadow_type = GTK_SHADOW_ETCHED_IN;
 280         }
 281
 282       gtk_paint_arrow (widget->style, widget->window,
 283                        widget->state, shadow_type,
 284                        &event->area, widget, "arrow",
 285                        effective_arrow_type, TRUE,
 286                        x, y, extent, extent);
 287     }
 288
 289   return FALSE;
 290 }