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tomo-old/elements/basic/container.go

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package basic
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import "image"
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import "git.tebibyte.media/sashakoshka/tomo"
import "git.tebibyte.media/sashakoshka/tomo/theme"
import "git.tebibyte.media/sashakoshka/tomo/artist"
import "git.tebibyte.media/sashakoshka/tomo/elements/core"
var containerCase = theme.C("basic", "container")
// Container is an element capable of containg other elements, and arranging
// them in a layout.
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type Container struct {
*core.Core
core core.CoreControl
layout tomo.Layout
children []tomo.LayoutEntry
drags [10]tomo.MouseTarget
warping bool
selected bool
selectable bool
flexible bool
onSelectionRequest func () (granted bool)
onSelectionMotionRequest func (tomo.SelectionDirection) (granted bool)
onFlexibleHeightChange func ()
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}
// NewContainer creates a new container.
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func NewContainer (layout tomo.Layout) (element *Container) {
element = &Container { }
element.Core, element.core = core.NewCore(element)
element.SetLayout(layout)
return
}
// SetLayout sets the layout of this container.
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func (element *Container) SetLayout (layout tomo.Layout) {
element.layout = layout
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if element.core.HasImage() {
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element.recalculate()
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element.draw()
element.core.DamageAll()
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}
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}
// 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.
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func (element *Container) Adopt (child tomo.Element, expand bool) {
// set event handlers
child.OnDamage (func (region tomo.Canvas) {
element.drawChildRegion(child, region)
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})
child.OnMinimumSizeChange(element.updateMinimumSize)
if child0, ok := child.(tomo.Flexible); ok {
child0.OnFlexibleHeightChange(element.updateMinimumSize)
}
if child0, ok := child.(tomo.Selectable); ok {
child0.OnSelectionRequest (func () (granted bool) {
return element.childSelectionRequestCallback(child0)
})
child0.OnSelectionMotionRequest (
func (direction tomo.SelectionDirection) (granted bool) {
if element.onSelectionMotionRequest == nil { return }
return element.onSelectionMotionRequest(direction)
})
}
// add child
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element.children = append (element.children, tomo.LayoutEntry {
Element: child,
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Expand: expand,
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})
// refresh stale data
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element.updateMinimumSize()
element.reflectChildProperties()
if element.core.HasImage() && !element.warping {
element.recalculate()
element.draw()
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.
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if element.core.HasImage() {
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element.recalculate()
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element.draw()
element.core.DamageAll()
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}
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}
// 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)
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element.children = append (
element.children[:index],
element.children[index + 1:]...)
break
}
}
element.updateMinimumSize()
element.reflectChildProperties()
if element.core.HasImage() && !element.warping {
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element.recalculate()
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element.draw()
element.core.DamageAll()
}
}
func (element *Container) clearChildEventHandlers (child tomo.Element) {
child.OnDamage(nil)
child.OnMinimumSizeChange(nil)
if child0, ok := child.(tomo.Selectable); ok {
child0.OnSelectionRequest(nil)
child0.OnSelectionMotionRequest(nil)
if child0.Selected() {
child0.HandleDeselection()
}
}
if child0, ok := child.(tomo.Flexible); ok {
child0.OnFlexibleHeightChange(nil)
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}
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}
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// DisownAll removes all child elements from the container at once.
func (element *Container) DisownAll () {
element.children = nil
element.updateMinimumSize()
element.reflectChildProperties()
if element.core.HasImage() && !element.warping {
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element.recalculate()
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element.draw()
element.core.DamageAll()
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}
}
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// 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
}
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// 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().Add(entry.Position)) {
child = entry.Element
}
}
return
}
func (element *Container) childPosition (child tomo.Element) (position image.Point) {
for _, entry := range element.children {
if entry.Element == child {
position = entry.Position
break
}
}
return
}
func (element *Container) Resize (width, height int) {
element.core.AllocateCanvas(width, height)
element.recalculate()
element.draw()
}
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func (element *Container) HandleMouseDown (x, y int, button tomo.Button) {
child, handlesMouse := element.ChildAt(image.Pt(x, y)).(tomo.MouseTarget)
if !handlesMouse { return }
element.drags[button] = child
childPosition := element.childPosition(child)
child.HandleMouseDown(x - childPosition.X, y - childPosition.Y, button)
}
func (element *Container) HandleMouseUp (x, y int, button tomo.Button) {
child := element.drags[button]
if child == nil { return }
element.drags[button] = nil
childPosition := element.childPosition(child)
child.HandleMouseUp(x - childPosition.X, y - childPosition.Y, button)
}
func (element *Container) HandleMouseMove (x, y int) {
for _, child := range element.drags {
if child == nil { continue }
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childPosition := element.childPosition(child)
child.HandleMouseMove(x - childPosition.X, y - childPosition.Y)
}
}
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func (element *Container) HandleMouseScroll (x, y int, deltaX, deltaY float64) {
child, handlesMouse := element.ChildAt(image.Pt(x, y)).(tomo.MouseTarget)
if !handlesMouse { return }
childPosition := element.childPosition(child)
child.HandleMouseScroll(x - childPosition.X, y - childPosition.Y, deltaX, deltaY)
}
func (element *Container) HandleKeyDown (key tomo.Key, modifiers tomo.Modifiers) {
element.forSelected (func (child tomo.Selectable) bool {
child0, handlesKeyboard := child.(tomo.KeyboardTarget)
if handlesKeyboard {
child0.HandleKeyDown(key, modifiers)
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}
return true
})
}
func (element *Container) HandleKeyUp (key tomo.Key, modifiers tomo.Modifiers) {
element.forSelected (func (child tomo.Selectable) bool {
child0, handlesKeyboard := child.(tomo.KeyboardTarget)
if handlesKeyboard {
child0.HandleKeyUp(key, modifiers)
}
return true
})
}
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func (element *Container) Selected () (selected bool) {
return element.selected
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}
func (element *Container) Select () {
if element.onSelectionRequest != nil {
element.onSelectionRequest()
}
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}
func (element *Container) HandleSelection (direction tomo.SelectionDirection) (ok bool) {
if !element.selectable { return false }
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direction = direction.Canon()
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firstSelected := element.firstSelected()
if firstSelected < 0 {
// no element is currently selected, so we need to select either
// the first or last selectable element depending on the
// direction.
switch direction {
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case tomo.SelectionDirectionNeutral, tomo.SelectionDirectionForward:
// if we recieve a neutral or forward direction, select
// the first selectable element.
return element.selectFirstSelectableElement(direction)
case tomo.SelectionDirectionBackward:
// if we recieve a backward direction, select the last
// selectable element.
return element.selectLastSelectableElement(direction)
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}
} else {
// an element is currently selected, so we need to move the
// selection in the specified direction
firstSelectedChild :=
element.children[firstSelected].Element.(tomo.Selectable)
// before we move the selection, the currently selected child
// may also be able to move its selection. if the child is able
// to do that, we will let it and not move ours.
if firstSelectedChild.HandleSelection(direction) {
return true
}
// find the previous/next selectable element relative to the
// currently selected element, if it exists.
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for index := firstSelected + int(direction);
index < len(element.children) && index >= 0;
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index += int(direction) {
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child, selectable :=
element.children[index].
Element.(tomo.Selectable)
if selectable && child.HandleSelection(direction) {
// we have found one, so we now actually move
// the selection.
firstSelectedChild.HandleDeselection()
element.selected = true
return true
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}
}
}
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return false
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}
func (element *Container) selectFirstSelectableElement (
direction tomo.SelectionDirection,
) (
ok bool,
) {
element.forSelectable (func (child tomo.Selectable) bool {
if child.HandleSelection(direction) {
element.selected = true
ok = true
return false
}
return true
})
return
}
func (element *Container) selectLastSelectableElement (
direction tomo.SelectionDirection,
) (
ok bool,
) {
element.forSelectableBackward (func (child tomo.Selectable) bool {
if child.HandleSelection(direction) {
element.selected = true
ok = true
return false
}
return true
})
return
}
func (element *Container) FlexibleHeightFor (width int) (height int) {
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return element.layout.FlexibleHeightFor(element.children, width)
}
func (element *Container) OnFlexibleHeightChange (callback func ()) {
element.onFlexibleHeightChange = callback
}
func (element *Container) HandleDeselection () {
element.selected = false
element.forSelected (func (child tomo.Selectable) bool {
child.HandleDeselection()
return true
})
}
func (element *Container) OnSelectionRequest (callback func () (granted bool)) {
element.onSelectionRequest = callback
}
func (element *Container) OnSelectionMotionRequest (
callback func (direction tomo.SelectionDirection) (granted bool),
) {
element.onSelectionMotionRequest = callback
}
func (element *Container) forSelected (callback func (child tomo.Selectable) bool) {
for _, entry := range element.children {
child, selectable := entry.Element.(tomo.Selectable)
if selectable && child.Selected() {
if !callback(child) { break }
}
}
}
func (element *Container) forSelectable (callback func (child tomo.Selectable) bool) {
for _, entry := range element.children {
child, selectable := entry.Element.(tomo.Selectable)
if selectable {
if !callback(child) { break }
}
}
}
func (element *Container) forFlexible (callback func (child tomo.Flexible) bool) {
for _, entry := range element.children {
child, selectable := entry.Element.(tomo.Flexible)
if selectable {
if !callback(child) { break }
}
}
}
func (element *Container) forSelectableBackward (callback func (child tomo.Selectable) bool) {
for index := len(element.children) - 1; index >= 0; index -- {
child, selectable := element.children[index].Element.(tomo.Selectable)
if selectable {
if !callback(child) { break }
}
}
}
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func (element *Container) firstSelected () (index int) {
for currentIndex, entry := range element.children {
child, selectable := entry.Element.(tomo.Selectable)
if selectable && child.Selected() {
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return currentIndex
}
}
return -1
}
func (element *Container) reflectChildProperties () {
element.selectable = false
element.forSelectable (func (tomo.Selectable) bool {
element.selectable = true
return false
})
element.flexible = false
element.forFlexible (func (tomo.Flexible) bool {
element.flexible = true
return false
})
if !element.selectable {
element.selected = false
}
}
func (element *Container) childSelectionRequestCallback (
child tomo.Selectable,
) (
granted bool,
) {
if element.onSelectionRequest != nil && element.onSelectionRequest() {
element.forSelected (func (child tomo.Selectable) bool {
child.HandleDeselection()
return true
})
child.HandleSelection(tomo.SelectionDirectionNeutral)
return true
} else {
return false
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}
}
func (element *Container) updateMinimumSize () {
width, height := element.layout.MinimumSize(element.children)
if element.flexible {
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height = element.layout.FlexibleHeightFor(element.children, width)
}
element.core.SetMinimumSize(width, height)
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}
func (element *Container) recalculate () {
bounds := element.Bounds()
element.layout.Arrange(element.children, bounds.Dx(), bounds.Dy())
}
func (element *Container) draw () {
bounds := element.core.Bounds()
pattern, _ := theme.BackgroundPattern (theme.PatternState {
Case: containerCase,
})
artist.FillRectangle(element.core, pattern, bounds)
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for _, entry := range element.children {
artist.Paste(element.core, entry, entry.Position)
}
}
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func (element *Container) drawChildRegion (child tomo.Element, region tomo.Canvas) {
if element.warping { return }
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for _, entry := range element.children {
if entry.Element == child {
artist.Paste(element.core, region, entry.Position)
element.core.DamageRegion (
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region.Bounds().Add(entry.Position))
break
}
}
}