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tomo-old/elements/cell.go

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package elements
import "git.tebibyte.media/sashakoshka/tomo"
import "git.tebibyte.media/sashakoshka/tomo/canvas"
import "git.tebibyte.media/sashakoshka/tomo/artist"
import "git.tebibyte.media/sashakoshka/tomo/default/theme"
type cellEntity interface {
tomo.ContainerEntity
tomo.SelectableEntity
}
// Cell is a single-element container that satisfies tomo.Selectable. It
// provides styling based on whether or not it is selected.
type Cell struct {
entity cellEntity
child tomo.Element
enabled bool
theme theme.Wrapped
onSelectionChange func ()
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}
// NewCell creates a new cell element. If padding is true, the cell will have
// padding on all sides. Child can be nil and added later with the Adopt()
// method.
func NewCell (child tomo.Element) (element *Cell) {
element = &Cell { enabled: true }
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element.theme.Case = tomo.C("tomo", "cell")
element.entity = tomo.NewEntity(element).(cellEntity)
element.Adopt(child)
return
}
// Entity returns this element's entity.
func (element *Cell) Entity () tomo.Entity {
return element.entity
}
// Draw causes the element to draw to the specified destination canvas.
func (element *Cell) Draw (destination canvas.Canvas) {
bounds := element.entity.Bounds()
pattern := element.theme.Pattern(tomo.PatternTableCell, element.state())
if element.child == nil {
pattern.Draw(destination, bounds)
} else {
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artist.DrawShatter (
destination, pattern, bounds,
element.child.Entity().Bounds())
}
}
// Draw causes the element to perform a layout operation.
func (element *Cell) Layout () {
if element.child == nil { return }
bounds := element.entity.Bounds()
bounds = element.theme.Padding(tomo.PatternTableCell).Apply(bounds)
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element.entity.PlaceChild(0, bounds)
}
// DrawBackground draws this element's background pattern to the specified
// destination canvas.
func (element *Cell) DrawBackground (destination canvas.Canvas) {
element.theme.Pattern(tomo.PatternTableCell, element.state()).
Draw(destination, element.entity.Bounds())
}
// Adopt sets this element's child. If nil is passed, any child is removed.
func (element *Cell) Adopt (child tomo.Element) {
if element.child != nil {
element.entity.Disown(element.entity.IndexOf(element.child))
}
if child != nil {
element.entity.Adopt(child)
}
element.child = child
element.updateMinimumSize()
element.entity.Invalidate()
element.invalidateChild()
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element.entity.InvalidateLayout()
}
// Child returns this element's child. If there is no child, this method will
// return nil.
func (element *Cell) Child () tomo.Element {
return element.child
}
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// Enabled returns whether this cell is enabled or not.
func (element *Cell) Enabled () bool {
return element.enabled
}
// SetEnabled sets whether this cell can be selected or not.
func (element *Cell) SetEnabled (enabled bool) {
if element.enabled == enabled { return }
element.enabled = enabled
element.entity.Invalidate()
element.invalidateChild()
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}
// SetTheme sets this element's theme.
func (element *Cell) SetTheme (theme tomo.Theme) {
if theme == element.theme.Theme { return }
element.theme.Theme = theme
element.updateMinimumSize()
element.entity.Invalidate()
element.invalidateChild()
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element.entity.InvalidateLayout()
}
// OnSelectionChange sets a function to be called when this element is selected
// or unselected.
func (element *Cell) OnSelectionChange (callback func ()) {
element.onSelectionChange = callback
}
func (element *Cell) Selected () bool {
return element.entity.Selected()
}
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func (element *Cell) HandleSelectionChange () {
element.entity.Invalidate()
element.invalidateChild()
if element.onSelectionChange != nil {
element.onSelectionChange()
}
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}
func (element *Cell) HandleChildMinimumSizeChange (tomo.Element) {
element.updateMinimumSize()
element.entity.Invalidate()
element.entity.InvalidateLayout()
}
func (element *Cell) state () tomo.State {
return tomo.State {
Disabled: !element.enabled,
On: element.entity.Selected(),
}
}
func (element *Cell) updateMinimumSize () {
width, height := 0, 0
if element.child != nil {
childWidth, childHeight := element.entity.ChildMinimumSize(0)
width += childWidth
height += childHeight
}
padding := element.theme.Padding(tomo.PatternTableCell)
width += padding.Horizontal()
height += padding.Vertical()
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element.entity.SetMinimumSize(width, height)
}
func (element *Cell) invalidateChild () {
if element.child != nil {
element.child.Entity().Invalidate()
}
}