commonMain.layouts.StackLayout.kt Maven / Gradle / Ivy
/*
* Copyright 2020-2022 Slawomir Czerwinski
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package graphics.glimpse.hud.layouts
import graphics.glimpse.hud.BoundingBox
import graphics.glimpse.types.Vec2
/**
* A layout arranging its elements in a stack.
*
* Each subsequent element is displayed on top of the previous one.
*/
class StackLayout(
/**
* Position of this layout.
*/
position: Vec2 = Vec2.nullVector,
/**
* Alignment of the elements.
*/
private val alignment: Alignment = Alignment.Center
) : BaseHudLayout(position) {
/**
* Arranges this layout's elements in a stack.
*/
override fun layoutElements() {
super.layoutElements()
val width = elements.maxOf { element -> element.boundingBox.width }
val height = elements.maxOf { element -> element.boundingBox.height }
boundingBox = BoundingBox(
left = -width / 2f,
right = width / 2f,
top = -height / 2f,
bottom = height / 2f
)
for (element in elements) {
element.position = Vec2(
x = alignment.x * (width - element.boundingBox.width) / 2f,
y = alignment.y * (height - element.boundingBox.height) / 2f
) - element.boundingBox.midpoint
}
}
}