130 lines
3.7 KiB
Kotlin
130 lines
3.7 KiB
Kotlin
package net.shadowfacts.shadowui.view
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import com.mojang.blaze3d.platform.GlStateManager
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import net.shadowfacts.kiwidsl.dsl
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import net.shadowfacts.shadowui.LayoutVariable
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import net.shadowfacts.shadowui.geometry.Axis
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import net.shadowfacts.shadowui.geometry.AxisPosition
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import net.shadowfacts.shadowui.geometry.Rect
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import net.shadowfacts.shadowui.geometry.Size
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import net.shadowfacts.shadowui.util.Color
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import net.shadowfacts.shadowui.util.RenderHelper
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import no.birkett.kiwi.Constraint
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import no.birkett.kiwi.Solver
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/**
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* @author shadowfacts
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*/
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open class View {
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lateinit var solver: Solver
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// in the coordinate system of the screen
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val leftAnchor = LayoutVariable(this, "left")
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val rightAnchor = LayoutVariable(this, "right")
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val topAnchor = LayoutVariable(this, "top")
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val bottomAnchor = LayoutVariable(this, "bottom")
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val widthAnchor = LayoutVariable(this, "width")
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val heightAnchor = LayoutVariable(this, "height")
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val centerXAnchor = LayoutVariable(this, "centerX")
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val centerYAnchor = LayoutVariable(this, "centerY")
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// The rectangle for this view in the coordinate system of the parent view.
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lateinit var frame: Rect
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// The rectangle for this view in its own coordinate system.
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lateinit var bounds: Rect
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var intrinsicContentSize: Size? = null
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set(value) {
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updateIntrinsicContentSizeConstraints(intrinsicContentSize, value)
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field = value
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}
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private var intrinsicContentSizeWidthConstraint: Constraint? = null
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private var intrinsicContentSizeHeightConstraint: Constraint? = null
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var backgroundColor = Color.CLEAR
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var parent: View? = null
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val subviews = mutableListOf<View>()
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fun getAnchor(axis: Axis, position: AxisPosition): LayoutVariable {
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return when (axis) {
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Axis.HORIZONTAL ->
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when (position) {
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AxisPosition.LEADING -> leftAnchor
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AxisPosition.CENTER -> centerXAnchor
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AxisPosition.TRAILING -> rightAnchor
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}
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Axis.VERTICAL ->
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when (position) {
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AxisPosition.LEADING -> topAnchor
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AxisPosition.CENTER -> centerYAnchor
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AxisPosition.TRAILING -> bottomAnchor
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}
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}
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}
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fun addSubview(view: View): View {
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subviews.add(view)
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view.parent = this
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view.solver = solver
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view.wasAdded()
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return view
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}
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open fun wasAdded() {
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createInternalConstraints()
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updateIntrinsicContentSizeConstraints(null, intrinsicContentSize)
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}
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open fun createInternalConstraints() {
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solver.dsl {
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rightAnchor equalTo (leftAnchor + widthAnchor)
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bottomAnchor equalTo (topAnchor + heightAnchor)
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centerXAnchor equalTo (leftAnchor + widthAnchor / 2)
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centerYAnchor equalTo (topAnchor + heightAnchor / 2)
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}
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}
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private fun updateIntrinsicContentSizeConstraints(old: Size?, new: Size?) {
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if (!this::solver.isInitialized) return
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if (old != null) {
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solver.removeConstraint(intrinsicContentSizeWidthConstraint!!)
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solver.removeConstraint(intrinsicContentSizeHeightConstraint!!)
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}
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if (new != null) {
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solver.dsl {
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this@View.intrinsicContentSizeWidthConstraint = (widthAnchor.equalTo(new.width, strength = WEAK))
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this@View.intrinsicContentSizeHeightConstraint = (heightAnchor.equalTo(new.height, strength = WEAK))
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}
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}
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}
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open fun didLayout() {
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subviews.forEach(View::didLayout)
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val parentLeft = parent?.leftAnchor?.value ?: 0.0
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val parentTop = parent?.topAnchor?.value ?: 0.0
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frame = Rect(leftAnchor.value - parentLeft, topAnchor.value - parentTop, widthAnchor.value, heightAnchor.value)
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bounds = Rect(0.0, 0.0, widthAnchor.value, heightAnchor.value)
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}
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fun draw() {
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GlStateManager.pushMatrix()
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GlStateManager.translated(frame.left, frame.top, 0.0)
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RenderHelper.fill(bounds, backgroundColor)
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drawContent()
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subviews.forEach(View::draw)
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GlStateManager.popMatrix()
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}
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open fun drawContent() {}
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} |