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 guint gtk_custom_hruler_get_type (void)
  48 {
  49         static guint custom_hruler_type = 0;
  50
  51         if (!custom_hruler_type) {
  52                 static const GtkTypeInfo custom_hruler_info = {
  53                         "GtkCustomHRuler",
  54                         sizeof (GtkCustomHRuler),
  55                         sizeof (GtkCustomHRulerClass),
  56                         (GtkClassInitFunc) gtk_custom_hruler_class_init,
  57                         (GtkObjectInitFunc) gtk_custom_hruler_init,
  58                         /* reserved_1 */ NULL,
  59                         /* reserved_2 */ NULL,
  60                         (GtkClassInitFunc) NULL,
  61                 };
  62                 custom_hruler_type = gtk_type_unique (gtk_custom_ruler_get_type (), &custom_hruler_info);
  63         }
  64         return custom_hruler_type;
  65 }
  66
  67 static void
  68 gtk_custom_hruler_class_init (GtkCustomHRulerClass * klass)
  69 {
  70         GtkWidgetClass *widget_class;
  71         GtkCustomRulerClass *ruler_class;
  72
  73         widget_class = (GtkWidgetClass *) klass;
  74         ruler_class = (GtkCustomRulerClass *) klass;
  75
  76         widget_class->motion_notify_event = gtk_custom_hruler_motion_notify;
  77
  78         ruler_class->draw_ticks = gtk_custom_hruler_draw_ticks;
  79         ruler_class->draw_pos = gtk_custom_hruler_draw_pos;
  80 }
  81
  82 static void
  83 gtk_custom_hruler_init (GtkCustomHRuler * custom_hruler)
  84 {
  85         GtkWidget *widget;
  86
  87         widget = GTK_WIDGET (custom_hruler);
  88         widget->requisition.width = widget->style->xthickness * 2 + 1;
  89         widget->requisition.height = widget->style->ythickness * 2 + RULER_HEIGHT;
  90 }
  91
  92
  93 GtkWidget *
  94 gtk_custom_hruler_new (void)
  95 {
  96         return GTK_WIDGET (gtk_type_new (gtk_custom_hruler_get_type ()));
  97 }
  98
  99 static gint
 100 gtk_custom_hruler_motion_notify (GtkWidget * widget, GdkEventMotion * event)
 101 {
 102         GtkCustomRuler *ruler;
 103         gint x;
 104
 105         g_return_val_if_fail (widget != NULL, FALSE);
 106         g_return_val_if_fail (GTK_IS_CUSTOM_HRULER (widget), FALSE);
 107         g_return_val_if_fail (event != NULL, FALSE);
 108
 109         ruler = GTK_CUSTOM_RULER (widget);
 110
 111         if (event->is_hint)
 112                 gdk_window_get_pointer (widget->window, &x, NULL, NULL);
 113         else
 114                 x = event->x;
 115
 116         ruler->position = ruler->lower + ((ruler->upper - ruler->lower) * x) / widget->allocation.width;
 117
 118         /*  Make sure the ruler has been allocated already  */
 119         if (ruler->backing_store != NULL)
 120                 gtk_custom_ruler_draw_pos (ruler);
 121
 122         return FALSE;
 123 }
 124
 125 static void
 126 gtk_custom_hruler_draw_ticks (GtkCustomRuler * ruler)
 127 {
 128         GtkWidget *widget;
 129         GdkGC *gc, *bg_gc;
 130         GdkFont *font;
 131         gint i;
 132         GtkCustomRulerMark *marks;
 133         gint nmarks;
 134         gint max_chars;
 135
 136         g_return_if_fail (ruler != NULL);
 137         g_return_if_fail (GTK_IS_CUSTOM_HRULER (ruler));
 138
 139         if (!GTK_WIDGET_DRAWABLE (ruler))
 140                 return;
 141
 142         widget = GTK_WIDGET (ruler);
 143
 144         gc = widget->style->fg_gc[GTK_STATE_NORMAL];
 145         bg_gc = widget->style->bg_gc[GTK_STATE_NORMAL];
 146         font = gtk_style_get_font(widget->style);
 147
 148         gtk_paint_box (widget->style, ruler->backing_store,
 149                        GTK_STATE_NORMAL, GTK_SHADOW_NONE,
 150                        NULL, widget, "custom_hruler", 0, 0, widget->allocation.width, widget->allocation.height);
 151
 152         gdk_draw_line (ruler->backing_store, gc, 0, widget->allocation.height - 1,
 153                        widget->allocation.width, widget->allocation.height - 1);
 154
 155         if ((ruler->upper - ruler->lower) == 0) {
 156                 return;
 157         }
 158
 159         /* we have to assume a fixed width font here */
 160
 161         max_chars = widget->allocation.width / gdk_string_width (font, "8");
 162
 163         nmarks = ruler->metric->get_marks (&marks, ruler->lower, ruler->upper, max_chars);
 164
 165         for (i = 0; i < nmarks; i++) {
 166                 gint pos;
 167                 gint height;
 168
 169                 pos = ROUND ((marks[i].position - ruler->lower) / ruler->metric->units_per_pixel);
 170                 height = widget->allocation.height;
 171
 172                 switch (marks[i].style) {
 173                 case GtkCustomRulerMarkMajor:
 174                         gdk_draw_line (ruler->backing_store, gc, pos, height, pos, 0);
 175                         break;
 176                 case GtkCustomRulerMarkMinor:
 177                         gdk_draw_line (ruler->backing_store, gc, pos, height, pos, height - (height/2));
 178                         break;
 179                 case GtkCustomRulerMarkMicro:
 180                         gdk_draw_line (ruler->backing_store, gc, pos, height, pos, height - 3);
 181                         break;
 182                 }
 183
 184                 gdk_draw_string (ruler->backing_store, font, gc, pos + 2, font->ascent - 1, marks[i].label);
 185                 g_free (marks[i].label);
 186         }
 187
 188         if (nmarks) {
 189                 g_free (marks);
 190         }
 191 }
 192
 193 static void
 194 gtk_custom_hruler_draw_pos (GtkCustomRuler * ruler)
 195 {
 196         GtkWidget *widget;
 197         GdkGC *gc;
 198         int i;
 199         gint x, y;
 200         gint width, height;
 201         gint bs_width, bs_height;
 202         gint xthickness;
 203         gint ythickness;
 204         gfloat increment;
 205
 206         g_return_if_fail (ruler != NULL);
 207         g_return_if_fail (GTK_IS_CUSTOM_HRULER (ruler));
 208         if (GTK_WIDGET_DRAWABLE (ruler) && (ruler->upper - ruler->lower) > 0) {
 209                 widget = GTK_WIDGET (ruler);
 210                 gc = widget->style->fg_gc[GTK_STATE_NORMAL];
 211                 xthickness = widget->style->xthickness;
 212                 ythickness = widget->style->ythickness;
 213                 width = widget->allocation.width;
 214                 height = widget->allocation.height - ythickness * 2;
 215
 216                 bs_width = height / 2;
 217                 bs_width |= 1;                  /* make sure it's odd */
 218                 bs_height = bs_width / 2 + 1;
 219
 220                 if ((bs_width > 0) && (bs_height > 0)) {
 221                         /*  If a backing store exists, restore the ruler  */
 222                         if (ruler->backing_store && ruler->non_gr_exp_gc)
 223                                 gdk_draw_pixmap (ruler->widget.window,
 224                                                  ruler->non_gr_exp_gc,
 225                                                  ruler->backing_store, ruler->xsrc, ruler->ysrc, ruler->xsrc, ruler->ysrc, bs_width, bs_height);
 226
 227                         increment = (gfloat) width / (ruler->upper - ruler->lower);
 228                         x = ROUND ((ruler->position - ruler->lower) * increment) + (xthickness - bs_width) / 2 - 1;
 229                         y = (height + bs_height) / 2 + ythickness;
 230
 231                         for (i = 0; i < bs_height; i++)
 232                                 gdk_draw_line (widget->window, gc, x + i, y + i, x + bs_width - 1 - i, y + i);
 233
 234
 235                         ruler->xsrc = x;
 236                         ruler->ysrc = y;
 237                 }
 238         }
 239 }