gtk2_ardour/gtk-custom-hruler.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 Library 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  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library 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 1997-1999.  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 /* modified by andreas meyer <hexx3000@gmx.de> */
  28 /* subsequently specialized for audio time displays by paul davis <paul@linuxaudiosystems.com> */
  29
  30 #include <math.h>
  31 #include <stdio.h>
  32 #include <string.h>
  33 #include "gtk-custom-hruler.h"
  34
  35 #define RULER_HEIGHT          14
  36 #define MINIMUM_INCR          5
  37 #define MAXIMUM_SUBDIVIDE     5
  38
  39 #define ROUND(x) ((int) ((x) + 0.5))
  40
  41 static void gtk_custom_hruler_class_init (GtkCustomHRulerClass * klass);
  42 static void gtk_custom_hruler_init (GtkCustomHRuler * custom_hruler);
  43 static gint gtk_custom_hruler_motion_notify (GtkWidget * widget, GdkEventMotion * event);
  44 static void gtk_custom_hruler_draw_ticks (GtkCustomRuler * ruler);
  45 static void gtk_custom_hruler_draw_pos (GtkCustomRuler * ruler);
  46
  47 GType gtk_custom_hruler_get_type (void)
  48 {
  49         static GType hruler_type = 0;
  50
  51         if (!hruler_type)
  52         {
  53                 static const GTypeInfo hruler_info =
  54                         {
  55                                 sizeof (GtkCustomHRulerClass),
  56                                 NULL,           /* base_init */
  57                                 NULL,           /* base_finalize */
  58                                 (GClassInitFunc) gtk_custom_hruler_class_init,
  59                                 NULL,           /* class_finalize */
  60                                 NULL,           /* class_data */
  61                                 sizeof (GtkCustomHRuler),
  62                                 0,              /* n_preallocs */
  63                                 (GInstanceInitFunc) gtk_custom_hruler_init,
  64                         };
  65
  66                 hruler_type = g_type_register_static (gtk_custom_ruler_get_type(), "GtkCustomHRuler",
  67                                                       &hruler_info, 0);
  68         }
  69
  70         return hruler_type;
  71 }
  72
  73 static void
  74 gtk_custom_hruler_class_init (GtkCustomHRulerClass * klass)
  75 {
  76         GtkWidgetClass *widget_class;
  77         GtkCustomRulerClass *ruler_class;
  78
  79         widget_class = (GtkWidgetClass *) klass;
  80         ruler_class = (GtkCustomRulerClass *) klass;
  81
  82         widget_class->motion_notify_event = gtk_custom_hruler_motion_notify;
  83
  84         ruler_class->draw_ticks = gtk_custom_hruler_draw_ticks;
  85         ruler_class->draw_pos = gtk_custom_hruler_draw_pos;
  86 }
  87
  88 static void
  89 gtk_custom_hruler_init (GtkCustomHRuler * custom_hruler)
  90 {
  91         GtkWidget *widget;
  92
  93         widget = GTK_WIDGET (custom_hruler);
  94         widget->requisition.width = widget->style->xthickness * 2 + 1;
  95         widget->requisition.height = widget->style->ythickness * 2 + RULER_HEIGHT;
  96 }
  97
  98
  99 GtkWidget *
 100 gtk_custom_hruler_new (void)
 101 {
 102         return GTK_WIDGET (gtk_type_new (gtk_custom_hruler_get_type ()));
 103 }
 104
 105 static gint
 106 gtk_custom_hruler_motion_notify (GtkWidget * widget, GdkEventMotion * event)
 107 {
 108         GtkCustomRuler *ruler;
 109         gint x;
 110
 111         g_return_val_if_fail (widget != NULL, FALSE);
 112         g_return_val_if_fail (GTK_IS_CUSTOM_HRULER (widget), FALSE);
 113         g_return_val_if_fail (event != NULL, FALSE);
 114
 115         ruler = GTK_CUSTOM_RULER (widget);
 116
 117         if (event->is_hint)
 118                 gdk_window_get_pointer (widget->window, &x, NULL, NULL);
 119         else
 120                 x = event->x;
 121
 122         ruler->position = ruler->lower + ((ruler->upper - ruler->lower) * x) / widget->allocation.width;
 123
 124         /*  Make sure the ruler has been allocated already  */
 125         if (ruler->backing_store != NULL)
 126                 gtk_custom_ruler_draw_pos (ruler);
 127
 128         return FALSE;
 129 }
 130
 131 static void
 132 gtk_custom_hruler_draw_ticks (GtkCustomRuler * ruler)
 133 {
 134         GtkWidget *widget;
 135         GdkGC *gc, *bg_gc;
 136         gint i;
 137         GtkCustomRulerMark *marks;
 138         gint xthickness;
 139         gint ythickness;
 140         gint nmarks;
 141         gint max_chars;
 142         gint digit_offset;
 143         PangoLayout *layout;
 144         PangoRectangle logical_rect, ink_rect;
 145
 146         g_return_if_fail (ruler != NULL);
 147         g_return_if_fail (GTK_IS_CUSTOM_HRULER (ruler));
 148
 149         if (!GTK_WIDGET_DRAWABLE (ruler))
 150                 return;
 151
 152         widget = GTK_WIDGET (ruler);
 153
 154         gc = widget->style->fg_gc[GTK_STATE_NORMAL];
 155         bg_gc = widget->style->bg_gc[GTK_STATE_NORMAL];
 156
 157         layout = gtk_widget_create_pango_layout (widget, "012456789");
 158         pango_layout_get_extents (layout, &ink_rect, &logical_rect);
 159
 160         digit_offset = ink_rect.y;
 161
 162         xthickness = widget->style->xthickness;
 163         ythickness = widget->style->ythickness;
 164
 165         gtk_paint_box (widget->style, ruler->backing_store,
 166                        GTK_STATE_NORMAL, GTK_SHADOW_NONE,
 167                        NULL, widget, "custom_hruler", 0, 0, widget->allocation.width, widget->allocation.height);
 168
 169         gdk_draw_line (ruler->backing_store, gc, 0, widget->allocation.height - 1,
 170                        widget->allocation.width, widget->allocation.height - 1);
 171
 172         if ((ruler->upper - ruler->lower) == 0) {
 173                 return;
 174         }
 175
 176         /* we have to assume a fixed width font here */
 177
 178         max_chars = widget->allocation.width / 12; // XXX FIX ME: pixel with of the char `8'
 179
 180         nmarks = ruler->metric->get_marks (&marks, ruler->lower, ruler->upper, max_chars);
 181
 182         for (i = 0; i < nmarks; i++) {
 183                 gint pos;
 184                 gint height;
 185
 186                 pos = ROUND ((marks[i].position - ruler->lower) / ruler->metric->units_per_pixel);
 187                 height = widget->allocation.height;
 188
 189                 switch (marks[i].style) {
 190                 case GtkCustomRulerMarkMajor:
 191                         gdk_draw_line (ruler->backing_store, gc, pos, height, pos, 0);
 192                         break;
 193                 case GtkCustomRulerMarkMinor:
 194                         gdk_draw_line (ruler->backing_store, gc, pos, height, pos, height - (height/2));
 195                         break;
 196                 case GtkCustomRulerMarkMicro:
 197                         gdk_draw_line (ruler->backing_store, gc, pos, height, pos, height - 3);
 198                         break;
 199                 }
 200
 201                 pango_layout_set_text (layout, marks[i].label, -1);
 202                 pango_layout_get_extents (layout, &logical_rect, NULL);
 203
 204                 gtk_paint_layout (widget->style,
 205                                   ruler->backing_store,
 206                                   GTK_WIDGET_STATE (widget),
 207                                   FALSE,
 208                                   NULL,
 209                                   widget,
 210                                   "hruler",
 211                                   pos + 2, ythickness + PANGO_PIXELS (logical_rect.y - digit_offset),
 212                                   layout);
 213
 214                 g_free (marks[i].label);
 215         }
 216
 217         if (nmarks) {
 218                 g_free (marks);
 219         }
 220
 221         g_object_unref (layout);
 222 }
 223
 224 static void
 225 gtk_custom_hruler_draw_pos (GtkCustomRuler * ruler)
 226 {
 227         GtkWidget *widget;
 228         GdkGC *gc;
 229         int i;
 230         gint x, y;
 231         gint width, height;
 232         gint bs_width, bs_height;
 233         gint xthickness;
 234         gint ythickness;
 235         gfloat increment;
 236
 237         g_return_if_fail (ruler != NULL);
 238         g_return_if_fail (GTK_IS_CUSTOM_HRULER (ruler));
 239         if (GTK_WIDGET_DRAWABLE (ruler) && (ruler->upper - ruler->lower) > 0) {
 240                 widget = GTK_WIDGET (ruler);
 241                 gc = widget->style->fg_gc[GTK_STATE_NORMAL];
 242                 xthickness = widget->style->xthickness;
 243                 ythickness = widget->style->ythickness;
 244                 width = widget->allocation.width;
 245                 height = widget->allocation.height - ythickness * 2;
 246
 247                 bs_width = height / 2;
 248                 bs_width |= 1;                  /* make sure it's odd */
 249                 bs_height = bs_width / 2 + 1;
 250
 251                 if ((bs_width > 0) && (bs_height > 0)) {
 252                         /*  If a backing store exists, restore the ruler  */
 253                         if (ruler->backing_store && ruler->non_gr_exp_gc)
 254                                 gdk_draw_pixmap (ruler->widget.window,
 255                                                  ruler->non_gr_exp_gc,
 256                                                  ruler->backing_store, ruler->xsrc, ruler->ysrc, ruler->xsrc, ruler->ysrc, bs_width, bs_height);
 257
 258                         increment = (gfloat) width / (ruler->upper - ruler->lower);
 259                         x = ROUND ((ruler->position - ruler->lower) * increment) + (xthickness - bs_width) / 2 - 1;
 260                         y = (height + bs_height) / 2 + ythickness;
 261
 262                         for (i = 0; i < bs_height; i++)
 263                                 gdk_draw_line (widget->window, gc, x + i, y + i, x + bs_width - 1 - i, y + i);
 264
 265
 266                         ruler->xsrc = x;
 267                         ruler->ysrc = y;
 268                 }
 269         }
 270 }