zathura/adjustment.c

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/* See LICENSE file for license and copyright information */
#include "adjustment.h"
#include "utils.h"
GtkAdjustment*
zathura_adjustment_clone(GtkAdjustment* adjustment)
{
gdouble value = gtk_adjustment_get_value(adjustment);
gdouble lower = gtk_adjustment_get_lower(adjustment);
gdouble upper = gtk_adjustment_get_upper(adjustment);
gdouble step_increment = gtk_adjustment_get_step_increment(adjustment);
gdouble page_increment = gtk_adjustment_get_page_increment(adjustment);
gdouble page_size = gtk_adjustment_get_page_size(adjustment);
return GTK_ADJUSTMENT(gtk_adjustment_new(value, lower, upper, step_increment,
page_increment, page_size));
}
void
zathura_adjustment_set_value(GtkAdjustment* adjustment, gdouble value)
{
gtk_adjustment_set_value(adjustment,
MAX(gtk_adjustment_get_lower(adjustment),
MIN(gtk_adjustment_get_upper(adjustment) -
gtk_adjustment_get_page_size(adjustment),
value)));
}
gdouble
zathura_adjustment_get_ratio(GtkAdjustment* adjustment)
{
gdouble lower = gtk_adjustment_get_lower(adjustment);
gdouble upper = gtk_adjustment_get_upper(adjustment);
gdouble page_size = gtk_adjustment_get_page_size(adjustment);
gdouble value = gtk_adjustment_get_value(adjustment);
return (value - lower + page_size / 2.0) / (upper - lower);
}
void
zathura_adjustment_set_value_from_ratio(GtkAdjustment* adjustment,
gdouble ratio)
{
if (ratio == 0.0) {
return;
}
gdouble lower = gtk_adjustment_get_lower(adjustment);
gdouble upper = gtk_adjustment_get_upper(adjustment);
gdouble page_size = gtk_adjustment_get_page_size(adjustment);
gdouble value = (upper - lower) * ratio + lower - page_size / 2.0;
zathura_adjustment_set_value(adjustment, value);
}