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