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tomo-old/elements/list.go

458 lines
12 KiB
Go

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