Pileus Git - ~andy/gtk/blob - gtk/gtkvscrollbar.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 1997-2000.  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 "gtkvscrollbar.h"
  28 #include "gtksignal.h"
  29 #include "gdk/gdkkeysyms.h"
  30
  31
  32 #define EPSILON 0.01
  33
  34 #define RANGE_CLASS(w)  GTK_RANGE_GET_CLASS (w)
  35
  36 enum {
  37   ARG_0,
  38   ARG_ADJUSTMENT
  39 };
  40
  41 static void gtk_vscrollbar_class_init       (GtkVScrollbarClass *klass);
  42 static void gtk_vscrollbar_init             (GtkVScrollbar      *vscrollbar);
  43 static void gtk_vscrollbar_set_arg          (GtkObject          *object,
  44                                              GtkArg             *arg,
  45                                              guint               arg_id);
  46 static void gtk_vscrollbar_get_arg          (GtkObject          *object,
  47                                              GtkArg             *arg,
  48                                              guint               arg_id);
  49 static void gtk_vscrollbar_realize          (GtkWidget          *widget);
  50 static void gtk_vscrollbar_size_allocate    (GtkWidget          *widget,
  51                                              GtkAllocation      *allocation);
  52 static void gtk_vscrollbar_draw_step_forw   (GtkRange           *range);
  53 static void gtk_vscrollbar_draw_step_back   (GtkRange           *range);
  54 static void gtk_vscrollbar_slider_update    (GtkRange           *range);
  55 static void gtk_vscrollbar_calc_slider_size (GtkVScrollbar      *vscrollbar);
  56 static gint gtk_vscrollbar_trough_keys      (GtkRange *range,
  57                                              GdkEventKey *key,
  58                                              GtkScrollType *scroll,
  59                                              GtkTroughType *pos);
  60
  61
  62 GtkType
  63 gtk_vscrollbar_get_type (void)
  64 {
  65   static GtkType vscrollbar_type = 0;
  66
  67   if (!vscrollbar_type)
  68     {
  69       static const GtkTypeInfo vscrollbar_info =
  70       {
  71         "GtkVScrollbar",
  72         sizeof (GtkVScrollbar),
  73         sizeof (GtkVScrollbarClass),
  74         (GtkClassInitFunc) gtk_vscrollbar_class_init,
  75         (GtkObjectInitFunc) gtk_vscrollbar_init,
  76         /* reserved_1 */ NULL,
  77         /* reserved_2 */ NULL,
  78         (GtkClassInitFunc) NULL,
  79       };
  80
  81       vscrollbar_type = gtk_type_unique (GTK_TYPE_SCROLLBAR, &vscrollbar_info);
  82     }
  83
  84   return vscrollbar_type;
  85 }
  86
  87 static void
  88 gtk_vscrollbar_class_init (GtkVScrollbarClass *class)
  89 {
  90   GtkObjectClass *object_class;
  91   GtkWidgetClass *widget_class;
  92   GtkRangeClass *range_class;
  93
  94   object_class = (GtkObjectClass*) class;
  95   widget_class = (GtkWidgetClass*) class;
  96   range_class = (GtkRangeClass*) class;
  97
  98   gtk_object_add_arg_type ("GtkVScrollbar::adjustment",
  99                            GTK_TYPE_ADJUSTMENT,
 100                            GTK_ARG_READWRITE,
 101                            ARG_ADJUSTMENT);
 102
 103   object_class->set_arg = gtk_vscrollbar_set_arg;
 104   object_class->get_arg = gtk_vscrollbar_get_arg;
 105
 106   widget_class->realize = gtk_vscrollbar_realize;
 107   widget_class->size_allocate = gtk_vscrollbar_size_allocate;
 108
 109   range_class->draw_step_forw = gtk_vscrollbar_draw_step_forw;
 110   range_class->draw_step_back = gtk_vscrollbar_draw_step_back;
 111   range_class->slider_update = gtk_vscrollbar_slider_update;
 112   range_class->trough_click = gtk_range_default_vtrough_click;
 113   range_class->trough_keys = gtk_vscrollbar_trough_keys;
 114   range_class->motion = gtk_range_default_vmotion;
 115 }
 116
 117 static void
 118 gtk_vscrollbar_set_arg (GtkObject          *object,
 119                         GtkArg             *arg,
 120                         guint               arg_id)
 121 {
 122   GtkVScrollbar *vscrollbar;
 123
 124   vscrollbar = GTK_VSCROLLBAR (object);
 125
 126   switch (arg_id)
 127     {
 128     case ARG_ADJUSTMENT:
 129       gtk_range_set_adjustment (GTK_RANGE (vscrollbar), GTK_VALUE_POINTER (*arg));
 130       break;
 131     default:
 132       break;
 133     }
 134 }
 135
 136 static void
 137 gtk_vscrollbar_get_arg (GtkObject          *object,
 138                         GtkArg             *arg,
 139                         guint               arg_id)
 140 {
 141   GtkVScrollbar *vscrollbar;
 142
 143   vscrollbar = GTK_VSCROLLBAR (object);
 144
 145   switch (arg_id)
 146     {
 147     case ARG_ADJUSTMENT:
 148       GTK_VALUE_POINTER (*arg) = GTK_RANGE (vscrollbar);
 149       break;
 150     default:
 151       arg->type = GTK_TYPE_INVALID;
 152       break;
 153     }
 154 }
 155
 156 static void
 157 gtk_vscrollbar_init (GtkVScrollbar *vscrollbar)
 158 {
 159   GtkWidget *widget;
 160   GtkRequisition *requisition;
 161
 162   widget = GTK_WIDGET (vscrollbar);
 163   requisition = &widget->requisition;
 164
 165   requisition->width = (RANGE_CLASS (widget)->slider_width +
 166                         widget->style->xthickness * 2);
 167   requisition->height = (RANGE_CLASS (widget)->min_slider_size +
 168                          RANGE_CLASS (widget)->stepper_size +
 169                          RANGE_CLASS (widget)->stepper_slider_spacing +
 170                          widget->style->ythickness) * 2;
 171 }
 172
 173 GtkWidget*
 174 gtk_vscrollbar_new (GtkAdjustment *adjustment)
 175 {
 176   GtkWidget *vscrollbar;
 177
 178   vscrollbar = gtk_widget_new (GTK_TYPE_VSCROLLBAR,
 179                                "adjustment", adjustment,
 180                                NULL);
 181
 182   return vscrollbar;
 183 }
 184
 185
 186 static void
 187 gtk_vscrollbar_realize (GtkWidget *widget)
 188 {
 189   GtkRange *range;
 190   GdkWindowAttr attributes;
 191   gint attributes_mask;
 192
 193   g_return_if_fail (widget != NULL);
 194   g_return_if_fail (GTK_IS_VSCROLLBAR (widget));
 195
 196   GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 197   range = GTK_RANGE (widget);
 198
 199   attributes.x = widget->allocation.x + (widget->allocation.width - widget->requisition.width) / 2;
 200   attributes.y = widget->allocation.y;
 201   attributes.width = widget->requisition.width;
 202   attributes.height = widget->allocation.height;
 203   attributes.wclass = GDK_INPUT_OUTPUT;
 204   attributes.window_type = GDK_WINDOW_CHILD;
 205   attributes.visual = gtk_widget_get_visual (widget);
 206   attributes.colormap = gtk_widget_get_colormap (widget);
 207   attributes.event_mask = gtk_widget_get_events (widget);
 208   attributes.event_mask |= (GDK_EXPOSURE_MASK |
 209                             GDK_BUTTON_PRESS_MASK |
 210                             GDK_BUTTON_RELEASE_MASK |
 211                             GDK_ENTER_NOTIFY_MASK |
 212                             GDK_LEAVE_NOTIFY_MASK);
 213
 214   attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 215   widget->window = gdk_window_new (gtk_widget_get_parent_window (widget), &attributes, attributes_mask);
 216
 217   range->trough = widget->window;
 218   gdk_window_ref (range->trough);
 219
 220   attributes.x = widget->style->xthickness;
 221   attributes.y = widget->style->ythickness;
 222   attributes.width = RANGE_CLASS (widget)->stepper_size;
 223   attributes.height = RANGE_CLASS (widget)->stepper_size;
 224
 225   range->step_back = gdk_window_new (range->trough, &attributes, attributes_mask);
 226
 227   attributes.y = (widget->allocation.height -
 228                   widget->style->ythickness -
 229                   RANGE_CLASS (widget)->stepper_size);
 230
 231   range->step_forw = gdk_window_new (range->trough, &attributes, attributes_mask);
 232
 233   attributes.x = widget->style->ythickness;
 234   attributes.y = 0;
 235   attributes.width = RANGE_CLASS (widget)->slider_width;
 236   attributes.height = RANGE_CLASS (widget)->min_slider_size;
 237   attributes.event_mask |= (GDK_BUTTON_MOTION_MASK |
 238                             GDK_POINTER_MOTION_HINT_MASK);
 239
 240   range->slider = gdk_window_new (range->trough, &attributes, attributes_mask);
 241
 242   gtk_vscrollbar_calc_slider_size (GTK_VSCROLLBAR (widget));
 243   gtk_range_slider_update (GTK_RANGE (widget));
 244
 245   widget->style = gtk_style_attach (widget->style, widget->window);
 246
 247   gdk_window_set_user_data (range->trough, widget);
 248   gdk_window_set_user_data (range->slider, widget);
 249   gdk_window_set_user_data (range->step_forw, widget);
 250   gdk_window_set_user_data (range->step_back, widget);
 251
 252   gtk_style_set_background (widget->style, range->trough, GTK_STATE_ACTIVE);
 253   gtk_style_set_background (widget->style, range->slider, GTK_STATE_NORMAL);
 254   gtk_style_set_background (widget->style, range->step_forw, GTK_STATE_ACTIVE);
 255   gtk_style_set_background (widget->style, range->step_back, GTK_STATE_ACTIVE);
 256
 257   gdk_window_show (range->slider);
 258   gdk_window_show (range->step_forw);
 259   gdk_window_show (range->step_back);
 260 }
 261
 262 static void
 263 gtk_vscrollbar_size_allocate (GtkWidget     *widget,
 264                               GtkAllocation *allocation)
 265 {
 266   GtkRange *range;
 267
 268   g_return_if_fail (widget != NULL);
 269   g_return_if_fail (GTK_IS_VSCROLLBAR (widget));
 270   g_return_if_fail (allocation != NULL);
 271
 272   widget->allocation = *allocation;
 273   if (GTK_WIDGET_REALIZED (widget))
 274     {
 275       range = GTK_RANGE (widget);
 276
 277       gdk_window_move_resize (range->trough,
 278                               allocation->x + (allocation->width - widget->requisition.width) / 2,
 279                               allocation->y,
 280                               widget->requisition.width, allocation->height);
 281       gdk_window_move_resize (range->step_back,
 282                               widget->style->xthickness,
 283                               widget->style->ythickness,
 284                               widget->requisition.width - widget->style->xthickness * 2,
 285                               RANGE_CLASS (widget)->stepper_size);
 286       gdk_window_move_resize (range->step_forw,
 287                               widget->style->xthickness,
 288                               allocation->height - widget->style->ythickness -
 289                               RANGE_CLASS (widget)->stepper_size,
 290                               widget->requisition.width - widget->style->xthickness * 2,
 291                               RANGE_CLASS (widget)->stepper_size);
 292
 293       gtk_range_slider_update (GTK_RANGE (widget));
 294     }
 295 }
 296
 297 static void
 298 gtk_vscrollbar_draw_step_forw (GtkRange *range)
 299 {
 300   GtkStateType state_type;
 301   GtkShadowType shadow_type;
 302
 303   g_return_if_fail (range != NULL);
 304   g_return_if_fail (GTK_IS_VSCROLLBAR (range));
 305
 306   if (GTK_WIDGET_DRAWABLE (range))
 307     {
 308       if (range->in_child == RANGE_CLASS (range)->step_forw)
 309         {
 310           if (range->click_child == RANGE_CLASS (range)->step_forw)
 311             state_type = GTK_STATE_ACTIVE;
 312           else
 313             state_type = GTK_STATE_PRELIGHT;
 314         }
 315       else
 316         state_type = GTK_STATE_NORMAL;
 317
 318       if (range->click_child == RANGE_CLASS (range)->step_forw)
 319         shadow_type = GTK_SHADOW_IN;
 320       else
 321         shadow_type = GTK_SHADOW_OUT;
 322
 323       gtk_paint_arrow (GTK_WIDGET (range)->style, range->step_forw,
 324                        state_type, shadow_type,
 325                        NULL, GTK_WIDGET (range), "vscrollbar",
 326                        GTK_ARROW_DOWN,
 327                        TRUE, 0, 0, -1, -1);
 328     }
 329 }
 330
 331 static void
 332 gtk_vscrollbar_draw_step_back (GtkRange *range)
 333 {
 334   GtkStateType state_type;
 335   GtkShadowType shadow_type;
 336
 337   g_return_if_fail (range != NULL);
 338   g_return_if_fail (GTK_IS_VSCROLLBAR (range));
 339
 340   if (GTK_WIDGET_DRAWABLE (range))
 341     {
 342       if (range->in_child == RANGE_CLASS (range)->step_back)
 343         {
 344           if (range->click_child == RANGE_CLASS (range)->step_back)
 345             state_type = GTK_STATE_ACTIVE;
 346           else
 347             state_type = GTK_STATE_PRELIGHT;
 348         }
 349       else
 350         state_type = GTK_STATE_NORMAL;
 351
 352       if (range->click_child == RANGE_CLASS (range)->step_back)
 353         shadow_type = GTK_SHADOW_IN;
 354       else
 355         shadow_type = GTK_SHADOW_OUT;
 356
 357       gtk_paint_arrow (GTK_WIDGET (range)->style, range->step_back,
 358                        state_type, shadow_type,
 359                        NULL, GTK_WIDGET (range), "vscrollbar",
 360                        GTK_ARROW_UP,
 361                        TRUE, 0, 0, -1, -1);
 362     }
 363 }
 364
 365 static void
 366 gtk_vscrollbar_slider_update (GtkRange *range)
 367 {
 368   g_return_if_fail (range != NULL);
 369   g_return_if_fail (GTK_IS_VSCROLLBAR (range));
 370
 371   gtk_vscrollbar_calc_slider_size (GTK_VSCROLLBAR (range));
 372   gtk_range_default_vslider_update (range);
 373 }
 374
 375 static void
 376 gtk_vscrollbar_calc_slider_size (GtkVScrollbar *vscrollbar)
 377 {
 378   GtkRange *range;
 379   gint step_back_y;
 380   gint step_back_height;
 381   gint step_forw_y;
 382   gint slider_width;
 383   gint slider_height;
 384   gint top, bottom;
 385   gint height;
 386
 387   g_return_if_fail (vscrollbar != NULL);
 388   g_return_if_fail (GTK_IS_VSCROLLBAR (vscrollbar));
 389
 390   if (GTK_WIDGET_REALIZED (vscrollbar))
 391     {
 392       range = GTK_RANGE (vscrollbar);
 393
 394       gdk_window_get_size (range->step_back, NULL, &step_back_height);
 395       gdk_window_get_position (range->step_back, NULL, &step_back_y);
 396       gdk_window_get_position (range->step_forw, NULL, &step_forw_y);
 397
 398       top = (step_back_y +
 399              step_back_height +
 400              RANGE_CLASS (vscrollbar)->stepper_slider_spacing);
 401       bottom = step_forw_y - RANGE_CLASS (vscrollbar)->stepper_slider_spacing;
 402       height = bottom - top;
 403
 404       if ((range->adjustment->page_size > 0) &&
 405           (range->adjustment->lower != range->adjustment->upper))
 406         {
 407           if (range->adjustment->page_size >
 408               (range->adjustment->upper - range->adjustment->lower))
 409             range->adjustment->page_size = range->adjustment->upper - range->adjustment->lower;
 410
 411           height = (height * range->adjustment->page_size /
 412                     (range->adjustment->upper - range->adjustment->lower));
 413
 414           if (height < RANGE_CLASS (vscrollbar)->min_slider_size)
 415             height = RANGE_CLASS (vscrollbar)->min_slider_size;
 416         }
 417
 418       gdk_window_get_size (range->slider, &slider_width, &slider_height);
 419
 420       if (slider_height != height)
 421         {
 422           gdk_window_resize (range->slider, slider_width, height);
 423           gdk_window_invalidate_rect (range->slider, NULL, FALSE);
 424         }
 425     }
 426 }
 427
 428 static gint
 429 gtk_vscrollbar_trough_keys(GtkRange *range,
 430                            GdkEventKey *key,
 431                            GtkScrollType *scroll,
 432                            GtkTroughType *pos)
 433 {
 434   gint return_val = FALSE;
 435   switch (key->keyval)
 436     {
 437     case GDK_Up:
 438       return_val = TRUE;
 439       *scroll = GTK_SCROLL_STEP_BACKWARD;
 440       break;
 441     case GDK_Down:
 442       return_val = TRUE;
 443       *scroll = GTK_SCROLL_STEP_FORWARD;
 444       break;
 445     case GDK_Page_Up:
 446       return_val = TRUE;
 447       if (key->state & GDK_CONTROL_MASK)
 448         *pos = GTK_TROUGH_START;
 449       else
 450         *scroll = GTK_SCROLL_PAGE_BACKWARD;
 451       break;
 452     case GDK_Page_Down:
 453       return_val = TRUE;
 454       if (key->state & GDK_CONTROL_MASK)
 455         *pos = GTK_TROUGH_END;
 456       else
 457         *scroll = GTK_SCROLL_PAGE_FORWARD;
 458       break;
 459     }
 460   return return_val;
 461 }