static gint
gtk_hruler_motion_notify (GtkWidget *widget,
GdkEventMotion *event)
{
GtkRuler *ruler;
gint x;
g_return_val_if_fail (widget != NULL, FALSE);
g_return_val_if_fail (GTK_IS_HRULER (widget), FALSE);
g_return_val_if_fail (event != NULL, FALSE);
ruler = GTK_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_ruler_draw_pos (ruler);
return FALSE;
}
static void
gtk_hruler_draw_pos (GtkRuler *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_HRULER (ruler));
if (GTK_WIDGET_DRAWABLE (ruler))
{
widget = GTK_WIDGET (ruler);
gc = widget->style->fg_gc[GTK_STATE_NORMAL];
xthickness = widget->style->klass->xthickness;
ythickness = widget->style->klass->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;
}
}
}
static void
gtk_shruler_draw_ticks(GtkRuler *ruler)
{
GtkWidget *widget;
GdkGC *gc, *bg_gc;
gint i;
gint width, height;
gint xthickness;
gint ythickness;
gint pos;
g_return_if_fail (ruler != NULL);
g_return_if_fail (GTK_IS_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];
xthickness = widget->style->xthickness;
ythickness = widget->style->ythickness;
width = widget->allocation.width;
height = widget->allocation.height - ythickness * 2;
gtk_paint_box (widget->style, ruler->backing_store,
GTK_STATE_NORMAL, GTK_SHADOW_OUT,
NULL, widget, "hruler",
0, 0,
widget->allocation.width, widget->allocation.height);
#if 0
gdk_draw_line (ruler->backing_store, gc,
xthickness,
height + ythickness,
widget->allocation.width - xthickness,
height + ythickness);
#endif
/* assume ruler->max_size has the char width */
/* i is increment of char_width, pos is label number
* y position is based on height of widget itself */
for ( pos = GTK_SHRULER(ruler)->start_pos, i = 0; pos < widget->allocation.width - xthickness; pos += ruler->max_size, i++ ) {
gint length = height / 8;
if ( i % 10 == 0 ) length = ( 2 * height / 3 );
else if ( i % 5 == 0 ) length = ( height / 3 );
gdk_draw_line(ruler->backing_store, gc,
pos, height + ythickness,
pos, height - length);
if ( i % 10 == 0 ) {
gchar buf[8];
PangoLayout *layout;
/* draw label */
g_snprintf(buf, sizeof buf, "%d", i);
layout = gtk_widget_create_pango_layout
(GTK_WIDGET(ruler), buf);
gdk_draw_layout(ruler->backing_store, gc, pos + 2,
0, layout);
g_object_unref(layout);
}
}
}
static void
gtk_hruler_draw_ticks (GtkRuler *ruler)
{
GtkWidget *widget;
GdkGC *gc, *bg_gc;
GdkFont *font;
gint i;
gint width, height;
gint xthickness;
gint ythickness;
gint length, ideal_length;
gfloat lower, upper; /* Upper and lower limits, in ruler units */
gfloat increment; /* Number of pixels per unit */
gint scale; /* Number of units per major unit */
gfloat subd_incr;
gfloat start, end, cur;
gchar unit_str[32];
gint digit_height;
gint text_width;
gint pos;
g_return_if_fail (ruler != NULL);
g_return_if_fail (GTK_IS_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 = widget->style->font;
xthickness = widget->style->klass->xthickness;
ythickness = widget->style->klass->ythickness;
digit_height = font->ascent; /* assume descent == 0 ? */
width = widget->allocation.width;
height = widget->allocation.height - ythickness * 2;
gtk_paint_box (widget->style, ruler->backing_store,
GTK_STATE_NORMAL, GTK_SHADOW_OUT,
NULL, widget, "hruler",
0, 0,
widget->allocation.width, widget->allocation.height);
gdk_draw_line (ruler->backing_store, gc,
xthickness,
height + ythickness,
widget->allocation.width - xthickness,
height + ythickness);
upper = ruler->upper / ruler->metric->pixels_per_unit;
lower = ruler->lower / ruler->metric->pixels_per_unit;
if ((upper - lower) == 0)
return;
increment = (gfloat) width / (upper - lower);
/* determine the scale
* We calculate the text size as for the vruler instead of using
* text_width = gdk_string_width(font, unit_str), so that the result
* for the scale looks consistent with an accompanying vruler
*/
scale = ceil (ruler->max_size / ruler->metric->pixels_per_unit);
sprintf (unit_str, "%d", scale);
text_width = strlen (unit_str) * digit_height + 1;
for (scale = 0; scale < MAXIMUM_SCALES; scale++)
if (ruler->metric->ruler_scale[scale] * fabs(increment) > 2 * text_width)
break;
if (scale == MAXIMUM_SCALES)
scale = MAXIMUM_SCALES - 1;
/* drawing starts here */
length = 0;
for (i = MAXIMUM_SUBDIVIDE - 1; i >= 0; i--)
{
subd_incr = (gfloat) ruler->metric->ruler_scale[scale] /
(gfloat) ruler->metric->subdivide[i];
if (subd_incr * fabs(increment) <= MINIMUM_INCR)
continue;
/* Calculate the length of the tickmarks. Make sure that
* this length increases for each set of ticks
*/
ideal_length = height / (i + 1) - 1;
if (ideal_length > ++length)
length = ideal_length;
if (lower < upper)
{
start = floor (lower / subd_incr) * subd_incr;
end = ceil (upper / subd_incr) * subd_incr;
}
else
{
start = floor (upper / subd_incr) * subd_incr;
end = ceil (lower / subd_incr) * subd_incr;
}
for (cur = start; cur <= end; cur += subd_incr)
{
pos = ROUND ((cur - lower) * increment);
gdk_draw_line (ruler->backing_store, gc,
pos, height + ythickness,
pos, height - length + ythickness);
/* draw label */
if (i == 0)
{
sprintf (unit_str, "%d", (int) cur);
gdk_draw_string (ruler->backing_store, font, gc,
pos + 2, ythickness + font->ascent - 1,
unit_str);
}
}
}
}
