449 lines
12 KiB
Go
449 lines
12 KiB
Go
package elements
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import "image"
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import "tomo"
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import "tomo/input"
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import "art"
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import "tomo/ability"
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import "art/artutil"
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type list struct {
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container
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entity tomo.Entity
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c tomo.Case
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enabled bool
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scroll image.Point
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contentBounds image.Rectangle
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selected int
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forcedMinimumWidth int
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forcedMinimumHeight int
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onClick func ()
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onSelectionChange func ()
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onScrollBoundsChange func ()
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}
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type List struct {
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list
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}
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type FlowList struct {
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list
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}
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func NewList (children ...tomo.Element) (element *List) {
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element = &List { }
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element.c = tomo.C("tomo", "list")
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element.entity = tomo.GetBackend().NewEntity(element)
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element.container.entity = element.entity
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element.minimumSize = element.updateMinimumSize
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element.init(children...)
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return
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}
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func NewFlowList (children ...tomo.Element) (element *FlowList) {
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element = &FlowList { }
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element.c = tomo.C("tomo", "flowList")
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element.entity = tomo.GetBackend().NewEntity(element)
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element.container.entity = element.entity
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element.minimumSize = element.updateMinimumSize
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element.init(children...)
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return
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}
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func (element *list) init (children ...tomo.Element) {
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element.selected = -1
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element.enabled = true
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element.container.init()
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element.Adopt(children...)
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}
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func (element *list) Draw (destination art.Canvas) {
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rocks := make([]image.Rectangle, element.entity.CountChildren())
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for index := 0; index < element.entity.CountChildren(); index ++ {
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rocks[index] = element.entity.Child(index).Entity().Bounds()
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}
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pattern := element.entity.Theme().Pattern(tomo.PatternSunken, element.state(), element.c)
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artutil.DrawShatter(destination, pattern, element.entity.Bounds(), rocks...)
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}
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func (element *List) Layout () {
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if element.scroll.Y > element.maxScrollHeight() {
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element.scroll.Y = element.maxScrollHeight()
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}
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margin := element.entity.Theme().Margin(tomo.PatternSunken, element.c)
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padding := element.entity.Theme().Padding(tomo.PatternSunken, element.c)
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bounds := padding.Apply(element.entity.Bounds())
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element.contentBounds = image.Rectangle { }
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dot := bounds.Min.Sub(element.scroll)
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for index := 0; index < element.entity.CountChildren(); index ++ {
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child := element.entity.Child(index)
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entry := element.scratch[child]
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width := bounds.Dx()
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height := int(entry.minSize)
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childBounds := tomo.Bounds (
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dot.X, dot.Y,
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width, height)
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element.entity.PlaceChild(index, childBounds)
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element.contentBounds = element.contentBounds.Union(childBounds)
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dot.Y += height
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dot.Y += margin.Y
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}
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element.contentBounds =
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element.contentBounds.Sub(element.contentBounds.Min)
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element.entity.NotifyScrollBoundsChange()
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if element.onScrollBoundsChange != nil {
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element.onScrollBoundsChange()
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}
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}
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func (element *FlowList) Layout () {
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if element.scroll.Y > element.maxScrollHeight() {
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element.scroll.Y = element.maxScrollHeight()
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}
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margin := element.entity.Theme().Margin(tomo.PatternSunken, element.c)
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padding := element.entity.Theme().Padding(tomo.PatternSunken, element.c)
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bounds := padding.Apply(element.entity.Bounds())
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element.contentBounds = image.Rectangle { }
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dot := bounds.Min.Sub(element.scroll)
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xStart := dot.X
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rowHeight := 0
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nextLine := func () {
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dot.X = xStart
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dot.Y += margin.Y
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dot.Y += rowHeight
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rowHeight = 0
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}
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for index := 0; index < element.entity.CountChildren(); index ++ {
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child := element.entity.Child(index)
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entry := element.scratch[child]
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width := int(entry.minBreadth)
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height := int(entry.minSize)
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if width + dot.X > bounds.Max.X {
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nextLine()
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}
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if typedChild, ok := child.(ability.Flexible); ok {
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height = typedChild.FlexibleHeightFor(width)
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}
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if rowHeight < height {
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rowHeight = height
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}
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childBounds := tomo.Bounds (
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dot.X, dot.Y,
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width, height)
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element.entity.PlaceChild(index, childBounds)
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element.contentBounds = element.contentBounds.Union(childBounds)
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dot.X += width + margin.X
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}
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element.contentBounds =
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element.contentBounds.Sub(element.contentBounds.Min)
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element.entity.NotifyScrollBoundsChange()
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if element.onScrollBoundsChange != nil {
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element.onScrollBoundsChange()
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}
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}
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func (element *list) Selected () ability.Selectable {
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if element.selected == -1 { return nil }
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child, ok := element.entity.Child(element.selected).(ability.Selectable)
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if !ok { return nil }
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return child
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}
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func (element *list) Select (child ability.Selectable) {
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index := element.entity.IndexOf(child)
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if element.selected == index { return }
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element.selectNone()
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element.selected = index
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element.entity.SelectChild(index, true)
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if element.onSelectionChange != nil {
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element.onSelectionChange()
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}
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element.scrollToSelected()
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}
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func (element *list) Enabled () bool {
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return element.enabled
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}
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func (element *list) SetEnabled (enabled bool) {
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if element.enabled == enabled { return }
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element.enabled = enabled
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element.entity.Invalidate()
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}
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func (element *list) Focus () {
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element.entity.Focus()
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}
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func (element *list) HandleFocusChange () {
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element.entity.Invalidate()
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}
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func (element *list) HandleMouseDown (
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position image.Point,
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button input.Button,
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modifiers input.Modifiers,
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) {
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if !element.enabled { return }
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element.Focus()
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element.selectNone()
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}
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func (element *list) HandleMouseUp (
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position image.Point,
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button input.Button,
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modifiers input.Modifiers,
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) { }
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func (element *list) HandleChildMouseDown (
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position image.Point,
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button input.Button,
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modifiers input.Modifiers,
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child tomo.Element,
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) {
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if !element.enabled { return }
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element.Focus()
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if child, ok := child.(ability.Selectable); ok {
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element.Select(child)
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}
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}
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func (element *list) HandleChildMouseUp (
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position image.Point,
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button input.Button,
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modifiers input.Modifiers,
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child tomo.Element,
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) {
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if !position.In(child.Entity().Bounds()) { return }
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if element.onClick != nil {
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element.onClick()
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}
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}
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func (element *list) HandleChildFlexibleHeightChange (child ability.Flexible) {
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element.minimumSize()
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element.entity.Invalidate()
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element.entity.InvalidateLayout()
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}
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func (element *list) HandleKeyDown (key input.Key, modifiers input.Modifiers) {
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if !element.Enabled() { return }
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index := -1
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switch key {
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case input.KeyUp, input.KeyLeft:
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index = element.selected - 1
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case input.KeyDown, input.KeyRight:
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index = element.selected + 1
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case input.KeyEnter:
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if element.onClick != nil {
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element.onClick()
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}
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}
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if index >= 0 && index < element.entity.CountChildren() {
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element.selectNone()
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element.selected = index
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element.entity.SelectChild(index, true)
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if element.onSelectionChange != nil {
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element.onSelectionChange()
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}
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element.scrollToSelected()
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}
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}
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func (element *list) HandleKeyUp(key input.Key, modifiers input.Modifiers) { }
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func (element *list) DrawBackground (destination art.Canvas) {
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element.entity.DrawBackground(destination)
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}
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func (element *list) HandleThemeChange () {
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element.minimumSize()
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element.entity.Invalidate()
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element.entity.InvalidateLayout()
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}
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// Collapse forces a minimum width and height upon the list. If a zero value is
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// given for a dimension, its minimum will be determined by the list's content.
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// If the list's height goes beyond the forced size, it will need to be accessed
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// via scrolling. If an entry's width goes beyond the forced size, its text will
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// be truncated so that it fits.
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func (element *list) Collapse (width, height int) {
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if
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element.forcedMinimumWidth == width &&
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element.forcedMinimumHeight == height {
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return
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}
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element.forcedMinimumWidth = width
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element.forcedMinimumHeight = height
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element.minimumSize()
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element.entity.Invalidate()
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element.entity.InvalidateLayout()
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}
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// ScrollContentBounds returns the full content size of the element.
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func (element *list) ScrollContentBounds () image.Rectangle {
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return element.contentBounds
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}
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// ScrollViewportBounds returns the size and position of the element's
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// viewport relative to ScrollBounds.
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func (element *list) ScrollViewportBounds () image.Rectangle {
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padding := element.entity.Theme().Padding(tomo.PatternSunken, element.c)
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bounds := padding.Apply(element.entity.Bounds())
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bounds = bounds.Sub(bounds.Min).Add(element.scroll)
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return bounds
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}
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// ScrollTo scrolls the viewport to the specified point relative to
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// ScrollBounds.
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func (element *list) ScrollTo (position image.Point) {
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if position.Y < 0 {
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position.Y = 0
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}
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maxScrollHeight := element.maxScrollHeight()
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if position.Y > maxScrollHeight {
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position.Y = maxScrollHeight
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}
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element.scroll = position
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element.entity.Invalidate()
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element.entity.InvalidateLayout()
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}
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// OnScrollBoundsChange sets a function to be called when the element's viewport
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// bounds, content bounds, or scroll axes change.
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func (element *list) OnScrollBoundsChange (callback func ()) {
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element.onScrollBoundsChange = callback
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}
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func (element *list) OnClick (callback func ()) {
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element.onClick = callback
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}
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func (element *list) OnSelectionChange (callback func ()) {
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element.onSelectionChange = callback
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}
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// ScrollAxes returns the supported axes for scrolling.
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func (element *list) ScrollAxes () (horizontal, vertical bool) {
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return false, true
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}
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func (element *list) selectNone () {
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if element.selected >= 0 {
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element.entity.SelectChild(element.selected, false)
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if element.onSelectionChange != nil {
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element.onSelectionChange()
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}
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}
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}
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func (element *list) scrollToSelected () {
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if element.selected < 0 { return }
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target := element.entity.Child(element.selected).Entity().Bounds()
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padding := element.entity.Theme().Padding(tomo.PatternSunken, element.c)
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bounds := padding.Apply(element.entity.Bounds())
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if target.Min.Y < bounds.Min.Y {
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element.scroll.Y -= bounds.Min.Y - target.Min.Y
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element.entity.Invalidate()
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element.entity.InvalidateLayout()
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} else if target.Max.Y > bounds.Max.Y {
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element.scroll.Y += target.Max.Y - bounds.Max.Y
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element.entity.Invalidate()
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element.entity.InvalidateLayout()
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}
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}
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func (element *list) state () tomo.State {
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return tomo.State {
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Focused: element.entity.Focused(),
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Disabled: !element.enabled,
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}
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}
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func (element *list) maxScrollHeight () (height int) {
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padding := element.entity.Theme().Padding(tomo.PatternSunken, element.c)
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viewportHeight := element.entity.Bounds().Dy() - padding.Vertical()
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height = element.contentBounds.Dy() - viewportHeight
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if height < 0 { height = 0 }
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return
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}
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func (element *List) updateMinimumSize () {
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margin := element.entity.Theme().Margin(tomo.PatternSunken, element.c)
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padding := element.entity.Theme().Padding(tomo.PatternSunken, element.c)
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width := 0
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height := 0
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for index := 0; index < element.entity.CountChildren(); index ++ {
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if index > 0 { height += margin.Y }
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child := element.entity.Child(index)
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entry := element.scratch[child]
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entryWidth, entryHeight := element.entity.ChildMinimumSize(index)
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entry.minBreadth = float64(entryWidth)
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entry.minSize = float64(entryHeight)
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element.scratch[child] = entry
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height += entryHeight
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if width < entryWidth { width = entryWidth }
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}
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width += padding.Horizontal()
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height += padding.Vertical()
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if element.forcedMinimumWidth > 0 {
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width = element.forcedMinimumWidth
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}
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if element.forcedMinimumHeight > 0 {
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height = element.forcedMinimumHeight
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}
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element.entity.SetMinimumSize(width, height)
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}
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func (element *FlowList) updateMinimumSize () {
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padding := element.entity.Theme().Padding(tomo.PatternSunken, element.c)
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minimumWidth := 0
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for index := 0; index < element.entity.CountChildren(); index ++ {
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width, height := element.entity.ChildMinimumSize(index)
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if width > minimumWidth {
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minimumWidth = width
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}
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key := element.entity.Child(index)
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entry := element.scratch[key]
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entry.minSize = float64(height)
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entry.minBreadth = float64(width)
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element.scratch[key] = entry
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}
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element.entity.SetMinimumSize (
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minimumWidth + padding.Horizontal(),
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padding.Vertical())
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}
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