155 lines
3.5 KiB
Go
155 lines
3.5 KiB
Go
package x
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import "image"
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import "git.tebibyte.media/sashakoshka/tomo"
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import "git.tebibyte.media/sashakoshka/tomo/canvas"
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type entity struct {
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window *window
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parent *entity
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children []*entity
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element tomo.Element
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drawDirty bool
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layoutDirty bool
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bounds image.Rectangle
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minWidth int
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minHeight int
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}
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func bind (element tomo.Element) *entity {
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entity := &entity { drawDirty: true }
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if _, ok := element.(tomo.Container); ok {
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entity.layoutDirty = true
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}
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element.Bind(entity)
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return entity
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}
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func (entity *entity) unbind () {
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entity.element.Bind(nil)
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for _, childEntity := range entity.children {
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childEntity.unbind()
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}
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}
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// ----------- Entity ----------- //
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func (entity *entity) Invalidate () {
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entity.drawDirty = true
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}
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func (entity *entity) Bounds () image.Rectangle {
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return entity.bounds
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}
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func (entity *entity) Window () tomo.Window {
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return entity.window
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}
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func (entity *entity) SetMinimumSize (width, height int) {
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entity.minWidth = width
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entity.minHeight = height
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if entity.parent == nil { return }
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entity.parent.element.(tomo.Container).HandleChildMinimumSizeChange()
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}
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func (entity *entity) DrawBackground (destination canvas.Canvas, bounds image.Rectangle) {
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if entity.parent == nil { return }
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entity.parent.element.(tomo.Container).DrawBackground(destination, bounds)
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}
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// ----------- ContainerEntity ----------- //
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func (entity *entity) InvalidateLayout () {
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entity.layoutDirty = true
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}
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func (entity *entity) Adopt (child tomo.Element) {
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entity.children = append(entity.children, bind(child))
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}
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func (entity *entity) Insert (index int, child tomo.Element) {
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entity.children = append (
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entity.children[:index + 1],
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entity.children[index:]...)
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entity.children[index] = bind(child)
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}
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func (entity *entity) Disown (index int) {
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entity.children[index].unbind()
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entity.children = append (
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entity.children[:index],
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entity.children[index + 1:]...)
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}
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func (entity *entity) IndexOf (child tomo.Element) int {
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for index, childEntity := range entity.children {
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if childEntity.element == child {
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return index
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}
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}
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return -1
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}
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func (entity *entity) Child (index int) tomo.Element {
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return entity.children[index].element
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}
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func (entity *entity) CountChildren () int {
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return len(entity.children)
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}
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func (entity *entity) PlaceChild (index int, bounds image.Rectangle) {
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entity.children[index].bounds = bounds
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}
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func (entity *entity) ChildMinimumSize (index int) (width, height int) {
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childEntity := entity.children[index]
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return childEntity.minWidth, childEntity.minHeight
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}
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// ----------- FocusableEntity ----------- //
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func (entity *entity) Focused () bool {
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return entity.window.focused == entity
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}
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func (entity *entity) Focus () {
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previous := entity.window.focused
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entity.window.focused = entity
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if previous != nil {
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previous.element.(tomo.Focusable).HandleFocusChange()
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}
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entity.element.(tomo.Focusable).HandleFocusChange()
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}
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func (entity *entity) FocusNext () {
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// TODO
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}
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func (entity *entity) FocusPrevious () {
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// TODO
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}
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// ----------- FlexibleEntity ----------- //
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func (entity *entity) NotifyFlexibleHeightChange () {
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if entity.parent == nil { return }
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if parent, ok := entity.parent.element.(tomo.FlexibleContainer); ok {
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parent.HandleChildFlexibleHeightChange()
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}
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}
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// ----------- ScrollableEntity ----------- //
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func (entity *entity) NotifyScrollBoundsChange () {
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if entity.parent == nil { return }
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if parent, ok := entity.parent.element.(tomo.ScrollableContainer); ok {
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parent.HandleChildScrollBoundsChange()
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}
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}
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