css.volume-breaking.scss Maven / Gradle / Ivy

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/**
 * Volume breaking
 */

$maximum-number-of-sheets: 70 !default;

@volume {
	max-length: $maximum-number-of-sheets;
}

/**
 * Amount with which volume breaks are allowed within "leaf sections", meaning that a
 * volume is not broken right before a heading.
 *
 * A leaf section is a block of adjacent content with the same sectioning depth.
 * Which means:
 * - either; a level element with no child levels
 * - or; the content in a level (, , etc.), which may have level element siblings
 *
 * If a level contains other levels, then this style sheet wraps the normal content
 * (, , etc.) in the level in a  element.
 *
 * The value of $allow-volume-break-inside-leaf-section-factor can range from 1 to 10.
 * Setting a higher value results in volumes that are more equal in size.
 */
$allow-volume-break-inside-leaf-section-factor: 10 !default;

/**
 * Amount with which preference is given to volume breaks before higher level sections
 * (level1 is the highest level) in comparison to lower level sections.
 *
 * The value can range from 0 to ? and can be a non-integer. A value of 0 (the default) means
 * no preference is given. A higher value results in volumes that are less equal in
 * size. Depending on the value of $allow-volume-break-inside-leaf-section-factor,
 * increasing $prefer-volume-break-before-higher-level-factor beyond a certain value does
 * not have an effect anymore.
 */
$prefer-volume-break-before-higher-level-factor: 0 !default;

$min-volume-keep-priority: min(10, max(1, round($allow-volume-break-inside-leaf-section-factor)));

@if $min-volume-keep-priority < 10 {
    
    $duplex: true !default;
    @xslt "volume-breaking.xsl" {
        duplex: $duplex;
        maximum-number-of-sheets: $maximum-number-of-sheets;
        allow-volume-break-inside-leaf-section-factor: $allow-volume-break-inside-leaf-section-factor;
        prefer-volume-break-before-higher-level-factor: $prefer-volume-break-before-higher-level-factor;
    }
    
    @if $prefer-volume-break-before-higher-level-factor > 0 {
        @for $level from 1 through 6 {
            $volume-keep-priority: min(10, max($min-volume-keep-priority, round(10 - $level * $prefer-volume-break-before-higher-level-factor)));
            @if $volume-keep-priority < 10 {
                level#{$level} {
                    volume-break-inside: -obfl-keep($volume-keep-priority);
                }
            }
        }
    }
    
    level1:not(:has(> level2, div.leaf-section)),
    level2:not(:has(> level3, div.leaf-section)),
    level3:not(:has(> level4, div.leaf-section)),
    level4:not(:has(> level5, div.leaf-section)),
    level5:not(:has(> level6, div.leaf-section)),
    level6:not(:has(div.leaf-section)),
    div.leaf-section {
        volume-break-inside: -obfl-keep($min-volume-keep-priority);
    }
}

css.volume-breaking.scss Maven / Gradle / Ivy

, , etc.), which may have level element siblings * * If a level contains other levels, then this style sheet wraps the normal content * (

, , etc.) in the level in a

,
, etc.), which may have level element siblings * * If a level contains other levels, then this style sheet wraps the normal content * (