git.sur5r.net Git - glabels/blob - src/wdgt-chain-button.c

   1 /*
   2  *  wdgt-chain-button.c
   3  *  Modified version of gimpchainbutton.h for gLabels:
   4  *
   5  *  LIBGIMP - The GIMP Library
   6  *  Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
   7  *
   8  *  gimpchainbutton.h
   9  *  Copyright (C) 1999-2000 Sven Neumann <sven@gimp.org>
  10  *
  11  *  Modified or gLabels by Jim Evins <evins@snaught.com>
  12  *
  13  *
  14  *  This file is part of gLabels.
  15  *
  16  *  gLabels is free software: you can redistribute it and/or modify
  17  *  it under the terms of the GNU General Public License as published by
  18  *  the Free Software Foundation, either version 3 of the License, or
  19  *  (at your option) any later version.
  20  *
  21  *  gLabels is distributed in the hope that it will be useful,
  22  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  *  GNU General Public License for more details.
  25  *
  26  *  You should have received a copy of the GNU General Public License
  27  *  along with gLabels.  If not, see <http://www.gnu.org/licenses/>.
  28  */
  29
  30 #include "wdgt-chain-button.h"
  31
  32 #include <gtk/gtk.h>
  33
  34 #include "stock.h"
  35
  36
  37 enum
  38 {
  39   TOGGLED,
  40   LAST_SIGNAL
  41 };
  42
  43
  44 static void      gl_wdgt_chain_button_clicked_callback (GtkWidget          *widget,
  45                                                         glWdgtChainButton  *button);
  46 static gboolean  gl_wdgt_chain_button_draw_lines       (GtkWidget          *widget,
  47                                                         GdkEventExpose     *eevent,
  48                                                         glWdgtChainButton  *button);
  49
  50
  51 static const gchar *gl_wdgt_chain_stock_items[] =
  52 {
  53   GL_STOCK_HCHAIN,
  54   GL_STOCK_HCHAIN_BROKEN,
  55   GL_STOCK_VCHAIN,
  56   GL_STOCK_VCHAIN_BROKEN
  57 };
  58
  59
  60 static guint gl_wdgt_chain_button_signals[LAST_SIGNAL] = { 0 };
  61
  62
  63
  64 G_DEFINE_TYPE (glWdgtChainButton, gl_wdgt_chain_button, GTK_TYPE_TABLE);
  65
  66
  67 static void
  68 gl_wdgt_chain_button_class_init (glWdgtChainButtonClass *class)
  69 {
  70         gl_wdgt_chain_button_parent_class = g_type_class_peek_parent (class);
  71
  72         gl_wdgt_chain_button_signals[TOGGLED] =
  73                 g_signal_new ("toggled",
  74                               G_TYPE_FROM_CLASS (class),
  75                               G_SIGNAL_RUN_FIRST,
  76                               G_STRUCT_OFFSET (glWdgtChainButtonClass, toggled),
  77                               NULL, NULL,
  78                               g_cclosure_marshal_VOID__VOID,
  79                               G_TYPE_NONE, 0);
  80
  81         class->toggled = NULL;
  82 }
  83
  84 static void
  85 gl_wdgt_chain_button_init (glWdgtChainButton *button)
  86 {
  87         button->position = GL_WDGT_CHAIN_TOP;
  88         button->active   = FALSE;
  89
  90         button->line1    = gtk_drawing_area_new ();
  91         button->line2    = gtk_drawing_area_new ();
  92         button->image    = gtk_image_new ();
  93
  94         button->button   = gtk_button_new ();
  95
  96         gtk_button_set_relief (GTK_BUTTON (button->button), GTK_RELIEF_NONE);
  97         gtk_container_add (GTK_CONTAINER (button->button), button->image);
  98         gtk_widget_show (button->image);
  99
 100         g_signal_connect (button->button, "clicked",
 101                           G_CALLBACK (gl_wdgt_chain_button_clicked_callback),
 102                           button);
 103         g_signal_connect (button->line1, "expose_event",
 104                           G_CALLBACK (gl_wdgt_chain_button_draw_lines),
 105                           button);
 106         g_signal_connect (button->line2, "expose_event",
 107                           G_CALLBACK (gl_wdgt_chain_button_draw_lines),
 108                           button);
 109 }
 110
 111
 112 /**
 113  * gl_wdgt_chain_button_new:
 114  * @position: The position you are going to use for the button
 115  *            with respect to the widgets you want to chain.
 116  *
 117  * Creates a new #glWdgtChainButton widget.
 118  *
 119  * This returns a button showing either a broken or a linked chain and
 120  * small clamps attached to both sides that visually group the two widgets
 121  * you want to connect. This widget looks best when attached
 122  * to a table taking up two columns (or rows respectively) next
 123  * to the widgets that it is supposed to connect. It may work
 124  * for more than two widgets, but the look is optimized for two.
 125  *
 126  * Returns: Pointer to the new #glWdgtChainButton, which is inactive
 127  *          by default. Use gl_wdgt_chain_button_set_active() to
 128  *          change its state.
 129  */
 130 GtkWidget *
 131 gl_wdgt_chain_button_new (glWdgtChainPosition position)
 132 {
 133   glWdgtChainButton *button;
 134
 135   button = g_object_new (GL_WDGT_TYPE_CHAIN_BUTTON, NULL);
 136
 137   button->position = position;
 138
 139   gtk_image_set_from_stock
 140     (GTK_IMAGE (button->image),
 141      gl_wdgt_chain_stock_items[((position & GL_WDGT_CHAIN_LEFT) << 1) + ! button->active],
 142      GTK_ICON_SIZE_BUTTON);
 143
 144   if (position & GL_WDGT_CHAIN_LEFT) /* are we a vertical chainbutton? */
 145     {
 146       gtk_table_resize (GTK_TABLE (button), 3, 1);
 147       gtk_table_attach (GTK_TABLE (button), button->button, 0, 1, 1, 2,
 148                         GTK_SHRINK, GTK_SHRINK, 0, 0);
 149       gtk_table_attach_defaults (GTK_TABLE (button),
 150                                  button->line1, 0, 1, 0, 1);
 151       gtk_table_attach_defaults (GTK_TABLE (button),
 152                                  button->line2, 0, 1, 2, 3);
 153     }
 154   else
 155     {
 156       gtk_table_resize (GTK_TABLE (button), 1, 3);
 157       gtk_table_attach (GTK_TABLE (button), button->button, 1, 2, 0, 1,
 158                         GTK_SHRINK, GTK_SHRINK, 0, 0);
 159       gtk_table_attach_defaults (GTK_TABLE (button),
 160                                  button->line1, 0, 1, 0, 1);
 161       gtk_table_attach_defaults (GTK_TABLE (button),
 162                                  button->line2, 2, 3, 0, 1);
 163     }
 164
 165   gtk_widget_show (button->button);
 166   gtk_widget_show (button->line1);
 167   gtk_widget_show (button->line2);
 168
 169   return GTK_WIDGET (button);
 170 }
 171
 172 /**
 173  * gl_wdgt_chain_button_set_active:
 174  * @button: Pointer to a #glWdgtChainButton.
 175  * @active: The new state.
 176  *
 177  * Sets the state of the #glWdgtChainButton to be either locked (%TRUE) or
 178  * unlocked (%FALSE) and changes the showed pixmap to reflect the new state.
 179  */
 180 void
 181 gl_wdgt_chain_button_set_active (glWdgtChainButton  *button,
 182                               gboolean          active)
 183 {
 184   g_return_if_fail (GL_WDGT_IS_CHAIN_BUTTON (button));
 185
 186   if (button->active != active)
 187     {
 188       guint num;
 189
 190       button->active = active ? TRUE : FALSE;
 191
 192       num = ((button->position & GL_WDGT_CHAIN_LEFT) << 1) + (active ? 0 : 1);
 193
 194       gtk_image_set_from_stock (GTK_IMAGE (button->image),
 195                                 gl_wdgt_chain_stock_items[num],
 196                                 GTK_ICON_SIZE_BUTTON);
 197     }
 198 }
 199
 200 /**
 201  * gl_wdgt_chain_button_get_active
 202  * @button: Pointer to a #glWdgtChainButton.
 203  *
 204  * Checks the state of the #glWdgtChainButton.
 205  *
 206  * Returns: %TRUE if the #glWdgtChainButton is active (locked).
 207  */
 208 gboolean
 209 gl_wdgt_chain_button_get_active (glWdgtChainButton *button)
 210 {
 211   g_return_val_if_fail (GL_WDGT_IS_CHAIN_BUTTON (button), FALSE);
 212
 213   return button->active;
 214 }
 215
 216 static void
 217 gl_wdgt_chain_button_clicked_callback (GtkWidget       *widget,
 218                                     glWdgtChainButton *button)
 219 {
 220   g_return_if_fail (GL_WDGT_IS_CHAIN_BUTTON (button));
 221
 222   gl_wdgt_chain_button_set_active (button, ! button->active);
 223
 224   g_signal_emit (button, gl_wdgt_chain_button_signals[TOGGLED], 0);
 225 }
 226
 227 static gboolean
 228 gl_wdgt_chain_button_draw_lines (GtkWidget         *widget,
 229                                  GdkEventExpose    *eevent,
 230                                  glWdgtChainButton *button)
 231 {
 232   GtkAllocation        allocation;
 233   GdkPoint             points[3];
 234   GdkPoint             buf;
 235   GtkShadowType        shadow;
 236   glWdgtChainPosition  position;
 237   gint                 which_line;
 238
 239 #define SHORT_LINE 4
 240   /* don't set this too high, there's no check against drawing outside
 241      the widgets bounds yet (and probably never will be) */
 242
 243   g_return_val_if_fail (GL_WDGT_IS_CHAIN_BUTTON (button), FALSE);
 244
 245   gtk_widget_get_allocation (widget, &allocation);
 246   points[0].x = allocation.width / 2;
 247   points[0].y = allocation.height / 2;
 248
 249   which_line = (widget == button->line1) ? 1 : -1;
 250
 251   position = button->position;
 252
 253   if (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL)
 254     switch (position)
 255       {
 256       case GL_WDGT_CHAIN_LEFT:
 257         position = GL_WDGT_CHAIN_RIGHT;
 258         break;
 259       case GL_WDGT_CHAIN_RIGHT:
 260         position = GL_WDGT_CHAIN_LEFT;
 261         break;
 262       default:
 263         break;
 264       }
 265
 266   switch (position)
 267     {
 268     case GL_WDGT_CHAIN_LEFT:
 269       points[0].x += SHORT_LINE;
 270       points[1].x = points[0].x - SHORT_LINE;
 271       points[1].y = points[0].y;
 272       points[2].x = points[1].x;
 273       points[2].y = (which_line == 1) ? allocation.height - 1 : 0;
 274       shadow = GTK_SHADOW_ETCHED_IN;
 275       break;
 276     case GL_WDGT_CHAIN_RIGHT:
 277       points[0].x -= SHORT_LINE;
 278       points[1].x = points[0].x + SHORT_LINE;
 279       points[1].y = points[0].y;
 280       points[2].x = points[1].x;
 281       points[2].y = (which_line == 1) ? allocation.height - 1 : 0;
 282       shadow = GTK_SHADOW_ETCHED_OUT;
 283       break;
 284     case GL_WDGT_CHAIN_TOP:
 285       points[0].y += SHORT_LINE;
 286       points[1].x = points[0].x;
 287       points[1].y = points[0].y - SHORT_LINE;
 288       points[2].x = (which_line == 1) ? allocation.width - 1 : 0;
 289       points[2].y = points[1].y;
 290       shadow = GTK_SHADOW_ETCHED_OUT;
 291       break;
 292     case GL_WDGT_CHAIN_BOTTOM:
 293       points[0].y -= SHORT_LINE;
 294       points[1].x = points[0].x;
 295       points[1].y = points[0].y + SHORT_LINE;
 296       points[2].x = (which_line == 1) ? allocation.width - 1 : 0;
 297       points[2].y = points[1].y;
 298       shadow = GTK_SHADOW_ETCHED_IN;
 299       break;
 300     default:
 301       return FALSE;
 302     }
 303
 304   if ( ((shadow == GTK_SHADOW_ETCHED_OUT) && (which_line == -1)) ||
 305        ((shadow == GTK_SHADOW_ETCHED_IN) && (which_line == 1)) )
 306     {
 307       buf = points[0];
 308       points[0] = points[2];
 309       points[2] = buf;
 310     }
 311
 312   gtk_paint_polygon (gtk_widget_get_style (widget),
 313                      gtk_widget_get_window (widget),
 314                      GTK_STATE_NORMAL,
 315                      shadow,
 316                      &eevent->area,
 317                      widget,
 318                      "chainbutton",
 319                      points,
 320                      3,
 321                      FALSE);
 322
 323   return TRUE;
 324 }
 325
 326
 327
 328 /*
 329  * Local Variables:       -- emacs
 330  * mode: C                -- emacs
 331  * c-basic-offset: 8      -- emacs
 332  * tab-width: 8           -- emacs
 333  * indent-tabs-mode: nil  -- emacs
 334  * End:                   -- emacs
 335  */