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tomo-old/elements/containers/document.go

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package containers
import "image"
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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/elements/core"
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import "git.tebibyte.media/sashakoshka/tomo/default/theme"
import "git.tebibyte.media/sashakoshka/tomo/default/config"
type DocumentContainer struct {
*core.Core
*core.Propagator
core core.CoreControl
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children []tomo.LayoutEntry
scroll image.Point
warping bool
contentBounds image.Rectangle
config config.Wrapped
theme theme.Wrapped
onScrollBoundsChange func ()
}
// NewDocumentContainer creates a new document container.
func NewDocumentContainer () (element *DocumentContainer) {
element = &DocumentContainer { }
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element.theme.Case = tomo.C("tomo", "documentContainer")
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element.Core, element.core = core.NewCore(element, element.redoAll)
element.Propagator = core.NewPropagator(element, element.core)
return
}
// Adopt adds a new child element to the container. If expand is true, then the
// element will stretch to either side of the container (much like a css block
// element). If expand is false, the element will share a line with other inline
// elements.
func (element *DocumentContainer) Adopt (child tomo.Element, expand bool) {
// set event handlers
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if child0, ok := child.(tomo.Themeable); ok {
child0.SetTheme(element.theme.Theme)
}
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if child0, ok := child.(tomo.Configurable); ok {
child0.SetConfig(element.config.Config)
}
// add child
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element.children = append (element.children, tomo.LayoutEntry {
Element: child,
Expand: expand,
})
child.SetParent(element)
// refresh stale data
element.updateMinimumSize()
if element.core.HasImage() && !element.warping {
element.redoAll()
element.core.DamageAll()
}
}
// Warp runs the specified callback, deferring all layout and rendering updates
// until the callback has finished executing. This allows for aplications to
// perform batch gui updates without flickering and stuff.
func (element *DocumentContainer) Warp (callback func ()) {
if element.warping {
callback()
return
}
element.warping = true
callback()
element.warping = false
if element.core.HasImage() {
element.redoAll()
element.core.DamageAll()
}
}
// Disown removes the given child from the container if it is contained within
// it.
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func (element *DocumentContainer) Disown (child tomo.Element) {
for index, entry := range element.children {
if entry.Element == child {
element.clearChildEventHandlers(entry.Element)
element.children = append (
element.children[:index],
element.children[index + 1:]...)
break
}
}
element.updateMinimumSize()
if element.core.HasImage() && !element.warping {
element.redoAll()
element.core.DamageAll()
}
}
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func (element *DocumentContainer) clearChildEventHandlers (child tomo.Element) {
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child.DrawTo(nil, image.Rectangle { }, nil)
child.SetParent(nil)
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if child, ok := child.(tomo.Focusable); ok {
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if child.Focused() {
child.HandleUnfocus()
}
}
}
// DisownAll removes all child elements from the container at once.
func (element *DocumentContainer) DisownAll () {
for _, entry := range element.children {
element.clearChildEventHandlers(entry.Element)
}
element.children = nil
element.updateMinimumSize()
if element.core.HasImage() && !element.warping {
element.redoAll()
element.core.DamageAll()
}
}
// Children returns a slice containing this element's children.
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func (element *DocumentContainer) Children () (children []tomo.Element) {
children = make([]tomo.Element, len(element.children))
for index, entry := range element.children {
children[index] = entry.Element
}
return
}
// CountChildren returns the amount of children contained within this element.
func (element *DocumentContainer) CountChildren () (count int) {
return len(element.children)
}
// Child returns the child at the specified index. If the index is out of
// bounds, this method will return nil.
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func (element *DocumentContainer) Child (index int) (child tomo.Element) {
if index < 0 || index > len(element.children) { return }
return element.children[index].Element
}
// ChildAt returns the child that contains the specified x and y coordinates. If
// there are no children at the coordinates, this method will return nil.
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func (element *DocumentContainer) ChildAt (point image.Point) (child tomo.Element) {
for _, entry := range element.children {
if point.In(entry.Bounds) {
child = entry.Element
}
}
return
}
func (element *DocumentContainer) redoAll () {
if !element.core.HasImage() { return }
// do a layout
element.doLayout()
maxScrollHeight := element.maxScrollHeight()
if element.scroll.Y > maxScrollHeight {
element.scroll.Y = maxScrollHeight
element.doLayout()
}
// draw a background
rocks := make([]image.Rectangle, len(element.children))
for index, entry := range element.children {
rocks[index] = entry.Bounds
}
pattern := element.theme.Pattern (
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tomo.PatternBackground,
tomo.State { })
artist.DrawShatter(element.core, pattern, element.Bounds(), rocks...)
element.partition()
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if parent, ok := element.core.Parent().(tomo.ScrollableParent); ok {
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parent.NotifyScrollBoundsChange(element)
}
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if element.onScrollBoundsChange != nil {
element.onScrollBoundsChange()
}
}
func (element *DocumentContainer) partition () {
for _, entry := range element.children {
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entry.DrawTo(nil, entry.Bounds, nil)
}
// cut our canvas up and give peices to child elements
for _, entry := range element.children {
if entry.Bounds.Overlaps(element.Bounds()) {
entry.DrawTo (
canvas.Cut(element.core, entry.Bounds),
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entry.Bounds, func (region image.Rectangle) {
element.core.DamageRegion(region)
})
}
}
}
func (element *DocumentContainer) Window () tomo.Window {
return element.core.Window()
}
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// NotifyMinimumSizeChange notifies the container that the minimum size of a
// child element has changed.
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func (element *DocumentContainer) NotifyMinimumSizeChange (child tomo.Element) {
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element.redoAll()
element.core.DamageAll()
}
// DrawBackground draws a portion of the container's background pattern within
// the specified bounds. The container will not push these changes.
func (element *DocumentContainer) DrawBackground (bounds image.Rectangle) {
element.core.DrawBackgroundBounds (
element.theme.Pattern(tomo.PatternBackground, tomo.State { }),
bounds)
}
// NotifyFlexibleHeightChange notifies the parent that the parameters
// affecting a child's flexible height have changed. This method is
// expected to be called by flexible child element when their content
// changes.
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func (element *DocumentContainer) NotifyFlexibleHeightChange (child tomo.Flexible) {
element.redoAll()
element.core.DamageAll()
}
// SetTheme sets the element's theme.
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func (element *DocumentContainer) SetTheme (new tomo.Theme) {
if new == element.theme.Theme { return }
element.theme.Theme = new
element.Propagator.SetTheme(new)
element.redoAll()
}
// SetConfig sets the element's configuration.
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func (element *DocumentContainer) SetConfig (new tomo.Config) {
if new == element.config.Config { return }
element.Propagator.SetConfig(new)
element.redoAll()
}
// ScrollContentBounds returns the full content size of the element.
func (element *DocumentContainer) ScrollContentBounds () image.Rectangle {
return element.contentBounds
}
// ScrollViewportBounds returns the size and position of the element's
// viewport relative to ScrollBounds.
func (element *DocumentContainer) ScrollViewportBounds () image.Rectangle {
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padding := element.theme.Padding(tomo.PatternBackground)
bounds := padding.Apply(element.Bounds())
bounds = bounds.Sub(bounds.Min).Add(element.scroll)
return bounds
}
// ScrollTo scrolls the viewport to the specified point relative to
// ScrollBounds.
func (element *DocumentContainer) ScrollTo (position image.Point) {
if position.Y < 0 {
position.Y = 0
}
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maxScrollHeight := element.maxScrollHeight()
if position.Y > maxScrollHeight {
position.Y = maxScrollHeight
}
element.scroll = position
if element.core.HasImage() && !element.warping {
element.redoAll()
element.core.DamageAll()
}
}
// OnScrollBoundsChange sets a function to be called when the element's viewport
// bounds, content bounds, or scroll axes change.
func (element *DocumentContainer) OnScrollBoundsChange (callback func ()) {
element.onScrollBoundsChange = callback
}
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func (element *DocumentContainer) maxScrollHeight () (height int) {
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padding := element.theme.Padding(tomo.PatternSunken)
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viewportHeight := element.Bounds().Dy() - padding.Vertical()
height = element.contentBounds.Dy() - viewportHeight
if height < 0 { height = 0 }
return
}
// ScrollAxes returns the supported axes for scrolling.
func (element *DocumentContainer) ScrollAxes () (horizontal, vertical bool) {
return false, true
}
func (element *DocumentContainer) doLayout () {
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margin := element.theme.Margin(tomo.PatternBackground)
padding := element.theme.Padding(tomo.PatternBackground)
bounds := padding.Apply(element.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, entry := range element.children {
if dot.X > xStart && entry.Expand {
nextLine()
}
width, height := entry.MinimumSize()
if width + dot.X > bounds.Dx() && !entry.Expand {
nextLine()
}
if width < bounds.Dx() && entry.Expand {
width = bounds.Dx()
}
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if typedChild, ok := entry.Element.(tomo.Flexible); ok {
height = typedChild.FlexibleHeightFor(width)
}
if rowHeight < height {
rowHeight = height
}
entry.Bounds.Min = dot
entry.Bounds.Max = image.Pt(dot.X + width, dot.Y + height)
element.children[index] = entry
element.contentBounds = element.contentBounds.Union(entry.Bounds)
if entry.Expand {
nextLine()
} else {
dot.X += width + margin.X
}
}
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element.contentBounds =
element.contentBounds.Sub(element.contentBounds.Min)
}
func (element *DocumentContainer) updateMinimumSize () {
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padding := element.theme.Padding(tomo.PatternBackground)
minimumWidth := 0
for _, entry := range element.children {
width, _ := entry.MinimumSize()
if width > minimumWidth {
minimumWidth = width
}
}
element.core.SetMinimumSize (
minimumWidth + padding.Horizontal(),
padding.Vertical())
}