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tomo-old/elements/basic/documentContainer.go

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package basicElements
import "image"
import "git.tebibyte.media/sashakoshka/tomo/input"
import "git.tebibyte.media/sashakoshka/tomo/theme"
import "git.tebibyte.media/sashakoshka/tomo/config"
import "git.tebibyte.media/sashakoshka/tomo/canvas"
import "git.tebibyte.media/sashakoshka/tomo/artist"
import "git.tebibyte.media/sashakoshka/tomo/layouts"
import "git.tebibyte.media/sashakoshka/tomo/elements"
import "git.tebibyte.media/sashakoshka/tomo/elements/core"
type DocumentContainer struct {
*core.Core
*core.Propagator
core core.CoreControl
children []layouts.LayoutEntry
scroll image.Point
warping bool
contentBounds image.Rectangle
config config.Wrapped
theme theme.Wrapped
onFocusRequest func () (granted bool)
onFocusMotionRequest func (input.KeynavDirection) (granted bool)
onScrollBoundsChange func ()
}
// NewDocumentContainer creates a new document container.
func NewDocumentContainer () (element *DocumentContainer) {
element = &DocumentContainer { }
element.theme.Case = theme.C("basic", "documentContainer")
element.Core, element.core = core.NewCore(element.redoAll)
element.Propagator = core.NewPropagator(element)
return
}
// Adopt adds a new child element to the container.
func (element *DocumentContainer) Adopt (child elements.Element) {
// set event handlers
if child0, ok := child.(elements.Themeable); ok {
child0.SetTheme(element.theme.Theme)
}
if child0, ok := child.(elements.Configurable); ok {
child0.SetConfig(element.config.Config)
}
child.OnDamage (func (region canvas.Canvas) {
element.core.DamageRegion(region.Bounds())
})
child.OnMinimumSizeChange (func () {
element.redoAll()
element.core.DamageAll()
})
if child0, ok := child.(elements.Flexible); ok {
child0.OnFlexibleHeightChange (func () {
element.redoAll()
element.core.DamageAll()
})
}
if child0, ok := child.(elements.Focusable); ok {
child0.OnFocusRequest (func () (granted bool) {
return element.childFocusRequestCallback(child0)
})
child0.OnFocusMotionRequest (
func (direction input.KeynavDirection) (granted bool) {
if element.onFocusMotionRequest == nil { return }
return element.onFocusMotionRequest(direction)
})
}
// add child
element.children = append (element.children, layouts.LayoutEntry {
Element: child,
})
// refresh stale data
element.reflectChildProperties()
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.
func (element *DocumentContainer) Disown (child elements.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.reflectChildProperties()
if element.core.HasImage() && !element.warping {
element.redoAll()
element.core.DamageAll()
}
}
func (element *DocumentContainer) clearChildEventHandlers (child elements.Element) {
child.DrawTo(nil, image.Rectangle { })
child.OnDamage(nil)
child.OnMinimumSizeChange(nil)
if child0, ok := child.(elements.Focusable); ok {
child0.OnFocusRequest(nil)
child0.OnFocusMotionRequest(nil)
if child0.Focused() {
child0.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.reflectChildProperties()
if element.core.HasImage() && !element.warping {
element.redoAll()
element.core.DamageAll()
}
}
// Children returns a slice containing this element's children.
func (element *DocumentContainer) Children () (children []elements.Element) {
children = make([]elements.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.
func (element *DocumentContainer) Child (index int) (child elements.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.
func (element *DocumentContainer) ChildAt (point image.Point) (child elements.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 (
theme.PatternBackground,
theme.State { })
artist.DrawShatter(element.core, pattern, element.Bounds(), rocks...)
element.partition()
if element.onScrollBoundsChange != nil {
element.onScrollBoundsChange()
}
}
func (element *DocumentContainer) partition () {
for _, entry := range element.children {
entry.DrawTo(nil, entry.Bounds)
}
// 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),
entry.Bounds)
}
}
}
// SetTheme sets the element's theme.
func (element *DocumentContainer) SetTheme (new theme.Theme) {
if new == element.theme.Theme { return }
element.theme.Theme = new
element.Propagator.SetTheme(new)
element.redoAll()
}
// SetConfig sets the element's configuration.
func (element *DocumentContainer) SetConfig (new config.Config) {
if new == element.config.Config { return }
element.Propagator.SetConfig(new)
element.redoAll()
}
func (element *DocumentContainer) OnFocusRequest (callback func () (granted bool)) {
element.onFocusRequest = callback
element.Propagator.OnFocusRequest(callback)
}
func (element *DocumentContainer) OnFocusMotionRequest (
callback func (direction input.KeynavDirection) (granted bool),
) {
element.onFocusMotionRequest = callback
element.Propagator.OnFocusMotionRequest(callback)
}
// 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 {
padding := element.theme.Padding(theme.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()
}
}
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func (element *DocumentContainer) maxScrollHeight () (height int) {
padding := element.theme.Padding(theme.PatternSunken)
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
}
// OnScrollBoundsChange sets a function to be called when the element's
// ScrollContentBounds, ScrollViewportBounds, or ScrollAxes are changed.
func (element *DocumentContainer) OnScrollBoundsChange(callback func()) {
element.onScrollBoundsChange = callback
}
func (element *DocumentContainer) reflectChildProperties () {
focusable := false
for _, entry := range element.children {
_, focusable := entry.Element.(elements.Focusable)
if focusable {
focusable = true
break
}
}
if !focusable && element.Focused() {
element.Propagator.HandleUnfocus()
}
}
func (element *DocumentContainer) childFocusRequestCallback (
child elements.Focusable,
) (
granted bool,
) {
if element.onFocusRequest != nil && element.onFocusRequest() {
element.Propagator.HandleUnfocus()
element.Propagator.HandleFocus(input.KeynavDirectionNeutral)
return true
} else {
return false
}
}
func (element *DocumentContainer) doLayout () {
margin := element.theme.Margin(theme.PatternBackground)
padding := element.theme.Padding(theme.PatternBackground)
bounds := padding.Apply(element.Bounds())
element.contentBounds = image.Rectangle { }
minimumWidth := 0
dot := bounds.Min.Sub(element.scroll)
for index, entry := range element.children {
if index > 0 {
dot.Y += margin.Y
}
width, height := entry.MinimumSize()
if width > minimumWidth {
minimumWidth = width
}
if width < bounds.Dx() {
width = bounds.Dx()
}
if typedChild, ok := entry.Element.(elements.Flexible); ok {
height = typedChild.FlexibleHeightFor(width)
}
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)
dot.Y += height
}
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element.contentBounds =
element.contentBounds.Sub(element.contentBounds.Min)
element.core.SetMinimumSize (
minimumWidth + padding.Horizontal(),
padding.Vertical())
}