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gtk-custom-hruler.c

/* GTK - The GIMP Toolkit
 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/*
 * Modified by the GTK+ Team and others 1997-1999.  See the AUTHORS
 * file for a list of people on the GTK+ Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GTK+ at ftp://ftp.gtk.org/pub/gtk/. 
 */

/* modified by andreas meyer <hexx3000@gmx.de> */
/* subsequently specialized for audio time displays by paul davis <paul@linuxaudiosystems.com> */

#include <math.h>
#include <stdio.h>
#include <string.h>
#include "gtk-custom-hruler.h"

#define RULER_HEIGHT          14
#define MINIMUM_INCR          5
#define MAXIMUM_SUBDIVIDE     5

#define ROUND(x) ((int) ((x) + 0.5))

static void gtk_custom_hruler_class_init (GtkCustomHRulerClass * klass);
static void gtk_custom_hruler_init (GtkCustomHRuler * custom_hruler);
static gint gtk_custom_hruler_motion_notify (GtkWidget * widget, GdkEventMotion * event);
static void gtk_custom_hruler_draw_ticks (GtkCustomRuler * ruler);
static void gtk_custom_hruler_draw_pos (GtkCustomRuler * ruler);

GType gtk_custom_hruler_get_type (void)
{
      static GType hruler_type = 0;
      
      if (!hruler_type)
      {
            static const GTypeInfo hruler_info =
                  {
                        sizeof (GtkCustomHRulerClass),
                        NULL,       /* base_init */
                        NULL,       /* base_finalize */
                        (GClassInitFunc) gtk_custom_hruler_class_init,
                        NULL,       /* class_finalize */
                        NULL,       /* class_data */
                        sizeof (GtkCustomHRuler),
                        0,          /* n_preallocs */
                        (GInstanceInitFunc) gtk_custom_hruler_init,
                  };
            
            hruler_type = g_type_register_static (gtk_custom_ruler_get_type(), "GtkCustomHRuler",
                                          &hruler_info, 0);
      }
      
      return hruler_type;
}

static void
gtk_custom_hruler_class_init (GtkCustomHRulerClass * klass)
{
      GtkWidgetClass *widget_class;
      GtkCustomRulerClass *ruler_class;

      widget_class = (GtkWidgetClass *) klass;
      ruler_class = (GtkCustomRulerClass *) klass;

      widget_class->motion_notify_event = gtk_custom_hruler_motion_notify;

      ruler_class->draw_ticks = gtk_custom_hruler_draw_ticks;
      ruler_class->draw_pos = gtk_custom_hruler_draw_pos;
}

static void
gtk_custom_hruler_init (GtkCustomHRuler * custom_hruler)
{
      GtkWidget *widget;

      widget = GTK_WIDGET (custom_hruler);
      widget->requisition.width = widget->style->xthickness * 2 + 1;
      widget->requisition.height = widget->style->ythickness * 2 + RULER_HEIGHT;
}


GtkWidget *
gtk_custom_hruler_new (void)
{
      return GTK_WIDGET (gtk_type_new (gtk_custom_hruler_get_type ()));
}

static gint
gtk_custom_hruler_motion_notify (GtkWidget * widget, GdkEventMotion * event)
{
      GtkCustomRuler *ruler;
      gint x;

      g_return_val_if_fail (widget != NULL, FALSE);
      g_return_val_if_fail (GTK_IS_CUSTOM_HRULER (widget), FALSE);
      g_return_val_if_fail (event != NULL, FALSE);

      ruler = GTK_CUSTOM_RULER (widget);

      if (event->is_hint)
            gdk_window_get_pointer (widget->window, &x, NULL, NULL);
      else
            x = event->x;

      ruler->position = ruler->lower + ((ruler->upper - ruler->lower) * x) / widget->allocation.width;

      /*  Make sure the ruler has been allocated already  */
      if (ruler->backing_store != NULL)
            gtk_custom_ruler_draw_pos (ruler);

      return FALSE;
}

static void
gtk_custom_hruler_draw_ticks (GtkCustomRuler * ruler)
{
      GtkWidget *widget;
      GdkGC *gc, *bg_gc;
      gint i;
      GtkCustomRulerMark *marks;
      gint xthickness;
      gint ythickness;
      gint nmarks;
      gint max_chars;
      gint digit_offset;
      PangoLayout *layout;
      PangoRectangle logical_rect, ink_rect;

      g_return_if_fail (ruler != NULL);
      g_return_if_fail (GTK_IS_CUSTOM_HRULER (ruler));

      if (!GTK_WIDGET_DRAWABLE (ruler))
            return;

      widget = GTK_WIDGET (ruler);

      gc = widget->style->fg_gc[GTK_STATE_NORMAL];
      bg_gc = widget->style->bg_gc[GTK_STATE_NORMAL];
      
      layout = gtk_widget_create_pango_layout (widget, "012456789");
      pango_layout_get_extents (layout, &ink_rect, &logical_rect);

      digit_offset = ink_rect.y;

      xthickness = widget->style->xthickness;
      ythickness = widget->style->ythickness;

      gtk_paint_box (widget->style, ruler->backing_store,
                   GTK_STATE_NORMAL, GTK_SHADOW_NONE,
                   NULL, widget, "custom_hruler", 0, 0, widget->allocation.width, widget->allocation.height);

      gdk_draw_line (ruler->backing_store, gc, 0, widget->allocation.height - 1, 
                   widget->allocation.width, widget->allocation.height - 1);

      if ((ruler->upper - ruler->lower) == 0) {
            return;
      }
      
      /* we have to assume a fixed width font here */

      max_chars = widget->allocation.width / 12; // XXX FIX ME: pixel with of the char `8'

      nmarks = ruler->metric->get_marks (&marks, ruler->lower, ruler->upper, max_chars);

      for (i = 0; i < nmarks; i++) {
            gint pos;
            gint height;

            pos = ROUND ((marks[i].position - ruler->lower) / ruler->metric->units_per_pixel);
            height = widget->allocation.height;

            switch (marks[i].style) {
            case GtkCustomRulerMarkMajor:
                  gdk_draw_line (ruler->backing_store, gc, pos, height, pos, 0);
                  break;
            case GtkCustomRulerMarkMinor:
                  gdk_draw_line (ruler->backing_store, gc, pos, height, pos, height - (height/2));
                  break;
            case GtkCustomRulerMarkMicro:
                  gdk_draw_line (ruler->backing_store, gc, pos, height, pos, height - 3);
                  break;
            }
            
            pango_layout_set_text (layout, marks[i].label, -1);
            pango_layout_get_extents (layout, &logical_rect, NULL);
            
            gtk_paint_layout (widget->style,
                          ruler->backing_store,
                          GTK_WIDGET_STATE (widget),
                          FALSE,
                          NULL,
                          widget,
                          "hruler",
                          pos + 2, ythickness + PANGO_PIXELS (logical_rect.y - digit_offset),
                          layout);
            
            g_free (marks[i].label);
      }
      
      if (nmarks) {
            g_free (marks);
      }
      
      g_object_unref (layout);
}

static void
gtk_custom_hruler_draw_pos (GtkCustomRuler * ruler)
{
      GtkWidget *widget;
      GdkGC *gc;
      int i;
      gint x, y;
      gint width, height;
      gint bs_width, bs_height;
      gint xthickness;
      gint ythickness;
      gfloat increment;

      g_return_if_fail (ruler != NULL);
      g_return_if_fail (GTK_IS_CUSTOM_HRULER (ruler));
      if (GTK_WIDGET_DRAWABLE (ruler) && (ruler->upper - ruler->lower) > 0) {
            widget = GTK_WIDGET (ruler);
            gc = widget->style->fg_gc[GTK_STATE_NORMAL];
            xthickness = widget->style->xthickness;
            ythickness = widget->style->ythickness;
            width = widget->allocation.width;
            height = widget->allocation.height - ythickness * 2;

            bs_width = height / 2;
            bs_width |= 1;                /* make sure it's odd */
            bs_height = bs_width / 2 + 1;

            if ((bs_width > 0) && (bs_height > 0)) {
                  /*  If a backing store exists, restore the ruler  */
                  if (ruler->backing_store && ruler->non_gr_exp_gc)
                        gdk_draw_pixmap (ruler->widget.window,
                                     ruler->non_gr_exp_gc,
                                     ruler->backing_store, ruler->xsrc, ruler->ysrc, ruler->xsrc, ruler->ysrc, bs_width, bs_height);
                  
                  increment = (gfloat) width / (ruler->upper - ruler->lower);
                  x = ROUND ((ruler->position - ruler->lower) * increment) + (xthickness - bs_width) / 2 - 1;
                  y = (height + bs_height) / 2 + ythickness;

                  for (i = 0; i < bs_height; i++)
                        gdk_draw_line (widget->window, gc, x + i, y + i, x + bs_width - 1 - i, y + i);


                  ruler->xsrc = x;
                  ruler->ysrc = y;
            }
      }
}

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