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readium/navigators/web/src/main/java/org/readium/navigator/web/layout/Layout.kt
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@file:OptIn(ExperimentalReadiumApi::class) | ||
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package org.readium.navigator.web.layout | ||
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import org.readium.r2.navigator.preferences.ReadingProgression | ||
import org.readium.r2.shared.ExperimentalReadiumApi | ||
import org.readium.r2.shared.util.Url | ||
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internal class Layout( | ||
val readingProgression: ReadingProgression, | ||
val spreads: List<Spread> | ||
) { | ||
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fun spreadIndexForPage(pageIndex: Int): Int = spreads | ||
.indexOfFirst { pageIndex in it.pages.map { page -> page.index } } | ||
.also { check(it != -1) } | ||
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fun pageIndexForSpread(spreadIndex: Int) = | ||
when (val spread = spreads[spreadIndex]) { | ||
is SingleViewportSpread -> | ||
spread.page.index | ||
is LeftOnlySpread -> | ||
spread.page.index | ||
is RightOnlySpread -> | ||
spread.page.index | ||
is DoubleSpread -> | ||
when (readingProgression) { | ||
ReadingProgression.LTR -> spread.leftPage.index | ||
ReadingProgression.RTL -> spread.rightPage.index | ||
} | ||
} | ||
} | ||
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internal data class Page( | ||
val index: Int, | ||
val href: Url | ||
) | ||
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internal sealed interface Spread { | ||
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val pages: List<Page> | ||
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fun contains(href: Url): Boolean = | ||
href in pages.map { it.href } | ||
} | ||
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internal data class SingleViewportSpread( | ||
val page: Page | ||
) : Spread { | ||
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override val pages: List<Page> get() = listOfNotNull(page) | ||
} | ||
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internal sealed class DoubleViewportSpread( | ||
override val pages: List<Page> | ||
) : Spread { | ||
abstract val leftPage: Page? | ||
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abstract val rightPage: Page? | ||
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companion object { | ||
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operator fun invoke(leftPage: Page?, rightPage: Page?): Spread = | ||
when { | ||
leftPage != null && rightPage != null -> DoubleSpread(leftPage, rightPage) | ||
leftPage != null -> LeftOnlySpread(leftPage) | ||
rightPage != null -> RightOnlySpread(rightPage) | ||
else -> throw IllegalArgumentException("Attempt to create an empty spread.") | ||
} | ||
} | ||
} | ||
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internal data class LeftOnlySpread( | ||
val page: Page | ||
) : DoubleViewportSpread(listOf(page)) { | ||
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override val leftPage: Page = page | ||
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override val rightPage: Page? = null | ||
} | ||
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internal data class RightOnlySpread( | ||
val page: Page | ||
) : DoubleViewportSpread(listOf(page)) { | ||
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override val leftPage: Page? = null | ||
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override val rightPage: Page = page | ||
} | ||
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internal data class DoubleSpread( | ||
override val leftPage: Page, | ||
override val rightPage: Page | ||
) : DoubleViewportSpread(listOf(leftPage, rightPage)) |
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readium/navigators/web/src/main/java/org/readium/navigator/web/layout/ReadingOrder.kt
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package org.readium.navigator.web.layout | ||
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import org.readium.r2.shared.publication.presentation.Presentation | ||
import org.readium.r2.shared.util.Url | ||
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internal data class ReadingOrder( | ||
val items: List<ReadingOrderItem> | ||
) | ||
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internal data class ReadingOrderItem( | ||
val href: Url, | ||
val page: Presentation.Page? | ||
) |
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