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 onScrollBoundsChange func () } func NewList (children ...tomo.Element) (element *List) { element = &List { selected: -1, enabled: true, } element.theme.Case = tomo.C("tomo", "list") element.entity = tomo.NewEntity(element).(listEntity) element.container.entity = element.entity element.minimumSize = element.updateMinimumSize element.init() element.Adopt(children...) return } 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 *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 { index := element.entity.IndexOf(child) if element.selected == index { return } element.selectNone() element.selected = index element.entity.SelectChild(index, true) element.scrollToSelected() } } func (element *List) HandleChildMouseUp ( position image.Point, button input.Button, modifiers input.Modifiers, child tomo.Element, ) { } func (element *List) HandleChildFlexibleHeightChange (child tomo.Flexible) { element.updateMinimumSize() 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 } if index >= 0 && index < element.entity.CountChildren() { element.selectNone() element.selected = index element.entity.SelectChild(index, true) 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.updateMinimumSize() 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.updateMinimumSize() 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.PatternBackground) 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 } // 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) } } func (element *List) scrollToSelected () { if element.selected < 0 { return } target := element.entity.Child(element.selected).Entity().Bounds() padding := element.theme.Padding(tomo.PatternBackground) 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) }