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livetrax/gtk2_ardour/gtk-custom-hruler.c

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/* 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;
GdkFont *font;
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];
font = gtk_style_get_font(widget->style);
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;
}
}
}