84 lines
2.2 KiB
Go
84 lines
2.2 KiB
Go
package elements
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import "tomo"
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type scratchEntry struct {
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expand bool
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minSize float64
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minBreadth float64
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}
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type container struct {
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entity tomo.Entity
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scratch map[tomo.Element] scratchEntry
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minimumSize func ()
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}
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// Entity returns this element's entity.
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func (container *container) Entity () tomo.Entity {
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return container.entity
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}
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// Adopt adds one or more elements to the container.
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func (container *container) Adopt (children ...tomo.Element) {
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container.adopt(false, children...)
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}
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func (container *container) init () {
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container.scratch = make(map[tomo.Element] scratchEntry)
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}
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func (container *container) adopt (expand bool, children ...tomo.Element) {
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for _, child := range children {
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container.entity.Adopt(child)
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container.scratch[child] = scratchEntry { expand: expand }
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}
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container.minimumSize()
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container.entity.Invalidate()
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container.entity.InvalidateLayout()
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}
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// Disown removes one or more elements from the container.
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func (container *container) Disown (children ...tomo.Element) {
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for _, child := range children {
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index := container.entity.IndexOf(child)
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if index < 0 { continue }
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container.entity.Disown(index)
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delete(container.scratch, child)
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}
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container.minimumSize()
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container.entity.Invalidate()
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container.entity.InvalidateLayout()
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}
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// DisownAll removes all elements from the container.
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func (container *container) DisownAll () {
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func () {
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for index := 0; index < container.entity.CountChildren(); index ++ {
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index := index
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defer container.entity.Disown(index)
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}
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} ()
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container.scratch = make(map[tomo.Element] scratchEntry)
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container.minimumSize()
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container.entity.Invalidate()
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container.entity.InvalidateLayout()
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}
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// Child returns the child at the specified index.
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func (container *container) Child (index int) tomo.Element {
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if index < 0 || index >= container.entity.CountChildren() { return nil }
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return container.entity.Child(index)
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}
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// CountChildren returns the amount of children in this container.
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func (container *container) CountChildren () int {
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return container.entity.CountChildren()
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}
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func (container *container) HandleChildMinimumSizeChange (child tomo.Element) {
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container.minimumSize()
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container.entity.Invalidate()
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container.entity.InvalidateLayout()
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}
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