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tomo-old/elements/containers/container.go

251 lines
7.1 KiB
Go

package containers
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/elements/core"
import "git.tebibyte.media/sashakoshka/tomo/default/theme"
import "git.tebibyte.media/sashakoshka/tomo/default/config"
// Container is an element capable of containg other elements, and arranging
// them in a layout.
type Container struct {
*core.Core
*core.Propagator
core core.CoreControl
layout tomo.Layout
children []tomo.LayoutEntry
warping bool
config config.Wrapped
theme theme.Wrapped
onFocusRequest func () (granted bool)
onFocusMotionRequest func (input.KeynavDirection) (granted bool)
}
// NewContainer creates a new container.
func NewContainer (layout tomo.Layout) (element *Container) {
element = &Container { }
element.theme.Case = tomo.C("tomo", "container")
element.Core, element.core = core.NewCore(element, element.redoAll)
element.Propagator = core.NewPropagator(element, element.core)
element.SetLayout(layout)
return
}
// SetLayout sets the layout of this container.
func (element *Container) SetLayout (layout tomo.Layout) {
element.layout = layout
element.updateMinimumSize()
if element.core.HasImage() {
element.redoAll()
element.core.DamageAll()
}
}
// Adopt adds a new child element to the container. If expand is set to true,
// the element will expand (instead of contract to its minimum size), in
// whatever way is defined by the current layout.
func (element *Container) Adopt (child tomo.Element, expand bool) {
if child0, ok := child.(tomo.Themeable); ok {
child0.SetTheme(element.theme.Theme)
}
if child0, ok := child.(tomo.Configurable); ok {
child0.SetConfig(element.config.Config)
}
child.SetParent(element)
// add child
element.children = append (element.children, tomo.LayoutEntry {
Element: child,
Expand: expand,
})
// 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 *Container) Warp (callback func ()) {
if element.warping {
callback()
return
}
element.warping = true
callback()
element.warping = false
// TODO: create some sort of task list so we don't do a full recalculate
// and redraw every time, because although that is the most likely use
// case, it is not the only one.
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 *Container) 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()
}
}
func (element *Container) clearChildEventHandlers (child tomo.Element) {
child.DrawTo(nil, image.Rectangle { }, nil)
child.SetParent(nil)
if child, ok := child.(tomo.Focusable); ok {
if child.Focused() {
child.HandleUnfocus()
}
}
}
// DisownAll removes all child elements from the container at once.
func (element *Container) 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.
func (element *Container) 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 *Container) 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 *Container) 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.
func (element *Container) ChildAt (point image.Point) (child tomo.Element) {
for _, entry := range element.children {
if point.In(entry.Bounds) {
child = entry.Element
}
}
return
}
func (element *Container) redoAll () {
if !element.core.HasImage() { return }
// remove child canvasses so that any operations done in here will not
// cause a child to draw to a wack ass canvas.
for _, entry := range element.children {
entry.DrawTo(nil, entry.Bounds, nil)
}
// do a layout
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 (
tomo.PatternBackground,
tomo.State { })
artist.DrawShatter(element.core, pattern, element.Bounds(), rocks...)
// cut our canvas up and give peices to child elements
for _, entry := range element.children {
entry.DrawTo (
canvas.Cut(element.core, entry.Bounds),
entry.Bounds, func (region image.Rectangle) {
element.core.DamageRegion(region)
})
}
}
func (element *Container) Window () tomo.Window {
return element.core.Window()
}
// NotifyMinimumSizeChange notifies the container that the minimum size of a
// child element has changed.
func (element *Container) NotifyMinimumSizeChange (child tomo.Element) {
element.updateMinimumSize()
element.redoAll()
element.core.DamageAll()
}
// SetTheme sets the element's theme.
func (element *Container) SetTheme (new tomo.Theme) {
if new == element.theme.Theme { return }
element.theme.Theme = new
element.Propagator.SetTheme(new)
element.updateMinimumSize()
element.redoAll()
}
// SetConfig sets the element's configuration.
func (element *Container) SetConfig (new tomo.Config) {
if new == element.config.Config { return }
element.Propagator.SetConfig(new)
element.updateMinimumSize()
element.redoAll()
}
func (element *Container) updateMinimumSize () {
margin := element.theme.Margin(tomo.PatternBackground)
padding := element.theme.Padding(tomo.PatternBackground)
width, height := element.layout.MinimumSize (
element.children, margin, padding)
element.core.SetMinimumSize(width, height)
}
func (element *Container) doLayout () {
margin := element.theme.Margin(tomo.PatternBackground)
padding := element.theme.Padding(tomo.PatternBackground)
element.layout.Arrange (
element.children, margin,
padding, element.Bounds())
}