34 lines
1.3 KiB
Kotlin
34 lines
1.3 KiB
Kotlin
package net.shadowfacts.cacao.util
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import net.shadowfacts.cacao.LayoutVariable
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import net.shadowfacts.cacao.geometry.Rect
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import net.shadowfacts.cacao.view.View
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/**
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* A layout guide is a non-view object that represents a rectangular area for the purposes of constraint-based layout.
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* It allows you to define complex layouts without needing empty container views.
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*
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* A layout guide is always owned by a view. The owning view's dimensions are not necessarily tied to the layout guide's.
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*
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* To create a layout guide, call [View.addLayoutGuide] on the owning view.
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*
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* @author shadowfacts
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*/
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class LayoutGuide(
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val owningView: View,
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) {
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val leftAnchor: LayoutVariable = LayoutVariable(this, "left")
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val rightAnchor: LayoutVariable = LayoutVariable(this, "right")
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val topAnchor: LayoutVariable = LayoutVariable(this, "top")
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val bottomAnchor: LayoutVariable = LayoutVariable(this, "bottom")
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val widthAnchor: LayoutVariable = LayoutVariable(this, "width")
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val heightAnchor: LayoutVariable = LayoutVariable(this, "height")
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val centerXAnchor: LayoutVariable = LayoutVariable(this, "centerX")
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val centerYAnchor: LayoutVariable = LayoutVariable(this, "centerY")
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val frame: Rect
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get() = Rect(leftAnchor.value - owningView.leftAnchor.value, topAnchor.value - owningView.topAnchor.value, widthAnchor.value, heightAnchor.value)
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}
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