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