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@GeePawHill
Last active March 15, 2020 22:11
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package org.geepawhill.contentment.jfx
import javafx.beans.property.Property
import javafx.beans.property.ReadOnlyProperty
import javafx.beans.property.SimpleObjectProperty
import javafx.beans.value.ChangeListener
import javafx.beans.value.ObservableValue
import javafx.collections.ObservableList
import javafx.scene.transform.Scale
import javafx.scene.transform.Transform
class AspectRatioConstraint(
private val hostWidth: ReadOnlyProperty<Number>,
private val hostHeight: ReadOnlyProperty<Number>,
private val transforms: ObservableList<Transform>,
private val mediaWidth: Property<Number>)
: ChangeListener<Number> {
init {
hostWidth.addListener(this)
hostHeight.addListener(this)
changed(SimpleObjectProperty(0.0), 300, 300)
}
override fun changed(observable: ObservableValue<out Number>, oldValue: Number, newValue: Number) {
val newWidth = hostWidth.value.toDouble()
val newHeight = hostHeight.value.toDouble()
val scaleFactor = if (newWidth / newHeight > ASPECT_RATIO) newHeight / FORCED_HEIGHT else newWidth / FORCED_WIDTH
val newScale = Scale(scaleFactor, scaleFactor)
newScale.pivotX = 0.0
newScale.pivotY = 0.0
mediaWidth.value = newWidth
transforms.setAll(newScale)
}
companion object {
private const val FORCED_WIDTH = 1600.0
private const val FORCED_HEIGHT = 900.0
private const val ASPECT_RATIO = FORCED_WIDTH / FORCED_HEIGHT
}
}
package org.geepawhill.contentment.jfx
import javafx.beans.property.SimpleObjectProperty
import javafx.beans.value.ChangeListener
import javafx.beans.value.ObservableValue
import javafx.scene.Group
import javafx.scene.layout.Pane
import javafx.scene.media.MediaView
import javafx.scene.transform.Scale
class ScaleListener(private val host: Pane, private val child: Group, private val media: MediaView) : ChangeListener<Number> {
init {
host.widthProperty().addListener(this)
host.heightProperty().addListener(this)
changed(SimpleObjectProperty(0.0), 300, 300)
}
override fun changed(observable: ObservableValue<out Number>, oldValue: Number, newValue: Number) {
val newWidth = host.width
media.fitWidth = newWidth
val newHeight = host.height
val scaleFactor = if (newWidth / newHeight > ASPECT_RATIO) newHeight / FORCED_HEIGHT else newWidth / FORCED_WIDTH
val newScale = Scale(scaleFactor, scaleFactor)
newScale.pivotX = 0.0
newScale.pivotY = 0.0
child.transforms.setAll(newScale)
}
companion object {
private const val FORCED_WIDTH = 1600.0
private const val FORCED_HEIGHT = 900.0
private const val ASPECT_RATIO = FORCED_WIDTH / FORCED_HEIGHT
}
}
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