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Add support for scrolling flow layouts to ContainerBox impl

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This commit is contained in:
Sasha Koshka 2024-05-17 15:03:59 -04:00
parent a64c27953a
commit cd72ae5bdd
1 changed files with 24 additions and 16 deletions
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40
containerbox.go
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@ -227,12 +227,6 @@ func (this *containerBox) notifyMinimumSizeChange (child anyBox) {
}
}
func (this *containerBox) boundedLayoutHints () tomo.LayoutHints {
hints := this.layoutHints()
hints.Bounds = this.ContentBounds().Add(this.InnerBounds().Min)
return hints
}
func (this *containerBox) layoutHints () tomo.LayoutHints {
return tomo.LayoutHints {
OverflowX: this.hOverflow,
@ -247,7 +241,7 @@ func (this *containerBox) contentMinimum () image.Point {
minimum := this.box.contentMinimum()
if this.layout != nil {
layoutMinimum := this.layout.MinimumSize (
this.boundedLayoutHints(),
this.layoutHints(),
this.children)
if this.hOverflow { layoutMinimum.X = 0 }
if this.vOverflow { layoutMinimum.Y = 0 }
@ -260,8 +254,8 @@ func (this *containerBox) doLayout () {
this.box.doLayout()
previousContentBounds := this.contentBounds
// by default, use innerBounds for contentBounds. if a direction
// overflows, use the layout's minimum size for it.
// by default, use innerBounds (translated to 0, 0) for contentBounds.
// if a direction overflows, use the layout's minimum size for it.
var minimum image.Point
if this.layout != nil {
minimum = this.layout.MinimumSize (
@ -269,19 +263,33 @@ func (this *containerBox) doLayout () {
this.children)
}
innerBounds := this.InnerBounds()
this.contentBounds = innerBounds
this.contentBounds = innerBounds.Sub(innerBounds.Min)
if this.hOverflow { this.contentBounds.Max.X = this.contentBounds.Min.X + minimum.X }
if this.vOverflow { this.contentBounds.Max.Y = this.contentBounds.Min.Y + minimum.Y }
// offset the content bounds by the scroll so children can be positioned
// accordingly.
this.constrainScroll()
this.contentBounds = this.contentBounds.Add(this.scroll).Sub(innerBounds.Min)
// arrange children
if this.layout != nil {
this.layout.Arrange(this.boundedLayoutHints(), this.children)
layoutHints := this.layoutHints()
layoutHints.Bounds = this.contentBounds
this.layout.Arrange(layoutHints, this.children)
}
// build an accurate contentBounds by unioning the bounds of all child
// boxes
this.contentBounds = image.Rectangle { }
for _, box := range this.children {
bounds := box.Bounds()
this.contentBounds = this.contentBounds.Union(bounds)
}
// constrain the scroll
this.constrainScroll()
// offset children and contentBounds by scroll
for _, box := range this.children {
box.SetBounds(box.Bounds().Add(this.scroll).Add(innerBounds.Min))
}
this.contentBounds = this.contentBounds.Add(this.scroll)
if previousContentBounds != this.contentBounds {
this.on.contentBoundsChange.Broadcast()