339 lines
9.2 KiB
Go
339 lines
9.2 KiB
Go
package elements
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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/input"
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import "git.tebibyte.media/sashakoshka/tomo/canvas"
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import "git.tebibyte.media/sashakoshka/tomo/artist"
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import "git.tebibyte.media/sashakoshka/tomo/default/theme"
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// TODO: make hidden variants:
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// vertical: one column.
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// flow: acts like DocumentContainer with all inline elements.
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// create wrapper elements for making a plain version of each of these, but keep
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// the implementations private (but with public methods) so they can be included
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// in other elements.
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// have table be a very tabular thing with named columns that can be sorted,
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// resized, etc.
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type listEntity interface {
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tomo.ContainerEntity
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tomo.ScrollableEntity
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}
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type List struct {
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entity listEntity
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scratch map[tomo.Element] scratchEntry
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scroll image.Point
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contentBounds image.Rectangle
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columnSizes []int
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selected int
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forcedMinimumWidth int
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forcedMinimumHeight int
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theme theme.Wrapped
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onScrollBoundsChange func ()
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}
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func NewList (columns int, children ...tomo.Element) (element *List) {
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if columns < 1 { columns = 1 }
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element = &List { selected: -1 }
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element.scratch = make(map[tomo.Element] scratchEntry)
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element.columnSizes = make([]int, columns)
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element.theme.Case = tomo.C("tomo", "list")
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element.entity = tomo.NewEntity(element).(listEntity)
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element.Adopt(children...)
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return
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}
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func (element *List) Entity () tomo.Entity {
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return element.entity
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}
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func (element *List) Draw (destination canvas.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.theme.Pattern(tomo.PatternSunken, tomo.State { })
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artist.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.theme.Margin(tomo.PatternSunken)
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padding := element.theme.Padding(tomo.PatternSunken)
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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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columnIndex := 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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columnIndex = 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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if columnIndex >= len(element.columnSizes) {
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nextLine()
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}
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width := element.columnSizes[columnIndex]
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height := int(entry.minSize)
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if len(element.columnSizes) == 1 && width < bounds.Dx() {
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width = bounds.Dx()
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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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columnIndex ++
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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) Adopt (children ...tomo.Element) {
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for _, child := range children {
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element.entity.Adopt(child)
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element.scratch[child] = scratchEntry { }
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}
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element.updateMinimumSize()
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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) Disown (children ...tomo.Element) {
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for _, child := range children {
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index := element.entity.IndexOf(child)
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if index < 0 { return }
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if index == element.selected {
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element.selected = -1
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element.entity.SelectChild(index, false)
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}
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element.entity.Disown(index)
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delete(element.scratch, child)
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}
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element.updateMinimumSize()
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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) DisownAll () {
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func () {
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for index := 0; index < element.entity.CountChildren(); index ++ {
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index := index
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defer element.entity.Disown(index)
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}
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} ()
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element.scratch = make(map[tomo.Element] scratchEntry)
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element.updateMinimumSize()
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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) Child (index int) tomo.Element {
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if index < 0 || index >= element.entity.CountChildren() { return nil }
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return element.entity.Child(index)
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}
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func (element *List) CountChildren () int {
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return element.entity.CountChildren()
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}
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func (element *List) HandleChildMouseDown (x, y int, button input.Button, child tomo.Element) {
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if child, ok := child.(tomo.Selectable); ok {
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index := element.entity.IndexOf(child)
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if element.selected == index { return }
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if element.selected >= 0 {
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element.entity.SelectChild(element.selected, false)
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}
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element.selected = index
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element.entity.SelectChild(index, true)
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}
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}
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func (element *List) HandleChildMouseUp (int, int, input.Button, tomo.Element) { }
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func (element *List) HandleChildMinimumSizeChange (child tomo.Element) {
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element.updateMinimumSize()
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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) HandleChildFlexibleHeightChange (child tomo.Flexible) {
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element.updateMinimumSize()
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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) DrawBackground (destination canvas.Canvas) {
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element.entity.DrawBackground(destination)
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}
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// SetTheme sets the element's theme.
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func (element *List) SetTheme (theme tomo.Theme) {
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if theme == element.theme.Theme { return }
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element.theme.Theme = theme
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element.updateMinimumSize()
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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.updateMinimumSize()
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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.theme.Padding(tomo.PatternBackground)
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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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// 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) maxScrollHeight () (height int) {
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padding := element.theme.Padding(tomo.PatternSunken)
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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.theme.Margin(tomo.PatternSunken)
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padding := element.theme.Padding(tomo.PatternSunken)
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for index := range element.columnSizes {
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element.columnSizes[index] = 0
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}
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height := 0
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rowHeight := 0
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columnIndex := 0
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nextLine := func () {
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height += rowHeight
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rowHeight = 0
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columnIndex = 0
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}
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for index := 0; index < element.entity.CountChildren(); index ++ {
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if columnIndex >= len(element.columnSizes) {
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if index > 0 { height += margin.Y }
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nextLine()
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}
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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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if rowHeight < entryHeight {
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rowHeight = entryHeight
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}
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if element.columnSizes[columnIndex] < entryWidth {
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element.columnSizes[columnIndex] = entryWidth
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}
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columnIndex ++
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}
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nextLine()
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width := 0; for index, size := range element.columnSizes {
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width += size
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if index > 0 { width += margin.X }
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}
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width += padding.Horizontal()
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height += padding.Vertical()
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if element.forcedMinimumHeight > 0 {
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height = element.forcedMinimumHeight
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}
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if element.forcedMinimumWidth > 0 {
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width = element.forcedMinimumWidth
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}
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element.entity.SetMinimumSize(width, height)
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}
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